Segfault on OSX with 3.6.1 #74570

gromgull · 2017-05-17T12:40:55Z

BPO	30385
Nosy	@ronaldoussoren, @ned-deily, @Birne94, @PythonCoderAS
Superseder	bpo-24273: _scproxy.so causes EXC_BAD_ACCESS (SIGSEGV)
Files	request_multiprocessing_crash.py: crashing program

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-05-19.15:21:23.905>
created_at = <Date 2017-05-17.12:40:54.938>
labels = ['OS-mac', 'type-crash']
title = 'Segfault on OSX with 3.6.1'
updated_at = <Date 2019-11-01.11:41:59.315>
user = 'https://bugs.python.org/gromgull'

bugs.python.org fields:

activity = <Date 2019-11-01.11:41:59.315>
actor = 'ThePokestarFan'
assignee = 'none'
closed = True
closed_date = <Date 2017-05-19.15:21:23.905>
closer = 'ned.deily'
components = ['macOS']
creation = <Date 2017-05-17.12:40:54.938>
creator = 'gromgull'
dependencies = []
files = ['46868']
hgrepos = []
issue_num = 30385
keywords = []
message_count = 6.0
messages = ['293849', '293851', '293955', '293958', '294136', '355810']
nosy_count = 5.0
nosy_names = ['ronaldoussoren', 'ned.deily', 'gromgull', 'Birne94', 'ThePokestarFan']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '24273'
type = 'crash'
url = 'https://bugs.python.org/issue30385'
versions = ['Python 3.6']

gromgull · 2017-05-17T12:40:40Z

This script, using requests and multiprocessing, will segfault on MacOS 16.4.0 with python 3.6.1. In 3.6.0 it runs fine.

The program is reduced from a much larger program, some weird things need to be present to trigger the crash. For instance the unused tornado imports on the top.

Crash log:

Process: Python [1510]
Path: /usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/Resources/Python.app/Contents/MacOS/Python
Identifier: Python
Version: 3.6.1 (3.6.1)
Code Type: X86-64 (Native)
Parent Process: Python [1509]
Responsible: Python [1510]
User ID: 501

Date/Time: 2017-05-17 14:23:47.307 +0200
OS Version: Mac OS X 10.12.3 (16D32)
Report Version: 12
Anonymous UUID: DB16C70B-F979-86B6-864C-0AC84B0E6402

Sleep/Wake UUID: 03D0B108-E764-4834-A88D-7919CAF9B786

Time Awake Since Boot: 630 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.os.log

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000010b692832
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]

VM Regions Near 0x10b692832:
VM_ALLOCATE 000000010b652000-000000010b692000 [ 256K] rw-/rwx SM=COW
-->
shared memory 000000010b6e3000-000000010b6eb000 [ 32K] r--/rw- SM=SHM

Application Specific Information:
crashed on child side of fork pre-exec

Thread 0 Crashed:: 0 libsystem_trace.dylib 1 libsystem_c.dylib 2 libsystem_trace.dylib 3 libdispatch.dylib 4 libdispatch.dylib 5 libsystem_trace.dylib 6 com.apple.SystemConfiguration 7 com.apple.SystemConfiguration 8 com.apple.SystemConfiguration 9 _scproxy.cpython- 10 org.python.python 11 org.python.python 12 org.python.python 13 org.python.python 14 org.python.python 15 org.python.python 16 org.python.python 17 org.python.python 18 org.python.python 19 org.python.python 20 org.python.python 21 org.python.python 22 org.python.python 23 org.python.python 24 org.python.python 25 org.python.python 26 org.python.python 27 org.python.python 28 org.python.python 29 org.python.python 30 org.python.python 31 org.python.python 32 org.python.python 33 org.python.python 34 org.python.python 35 org.python.python 36 org.python.python 37 org.python.python 38 org.python.python 39 org.python.python 40 org.python.python 41 org.python.python 42 org.python.python 43 org.python.python 44 org.python.python 45 org.python.python 46 org.python.python 47 org.python.python 48 org.python.python 49 org.python.python 50 org.python.python 51 org.python.python 52 org.python.python 53 org.python.python 54 org.python.python 55 org.python.python 56 org.python.python 57 org.python.python 58 org.python.python 59 org.python.python 60 org.python.python 61 org.python.python 62 org.python.python 63 org.python.python 64 org.python.python 65 org.python.python 66 org.python.python 67 org.python.python 68 org.python.python 69 org.python.python 70 org.python.python 71 org.python.python 72 org.python.python 73 org.python.python 74 org.python.python 75 org.python.python 76 org.python.python 77 org.python.python 78 org.python.python 79 org.python.python 80 org.python.python 81 org.python.python 82 org.python.python 83 org.python.python 84 org.python.python 85 org.python.python 86 org.python.python 87 org.python.python 88 org.python.python 89 org.python.python 90 org.python.python 91 org.python.python 92 org.python.python 93 org.python.python 94 org.python.python 95 org.python.python 96 org.python.python 97 org.python.python 98 org.python.python 99 org.python.python 100 org.python.python 101 org.python.python 102 org.python.python 103 org.python.python 104 org.python.python 105 libdyld.dylib Dispatch queue: com.apple.os.log
0x00007fffab4bb622 _os_log_cmp_key + 4
0x00007fffab324144 rb_tree_find_node + 58
0x00007fffab4bbb5a __os_log_create_block_invoke + 30
0x00007fffab2460b8 _dispatch_client_callout + 8
0x00007fffab246cf2 _dispatch_barrier_sync_f_invoke + 83
0x00007fffab4bb8ac os_log_create + 590
0x00007fff9c8faafa __SCDynamicStoreCheckRetryAndHandleError + 167
0x00007fff9c8f9e12 SCDynamicStoreCopyValue + 189
0x00007fff9c8fe6fb SCDynamicStoreCopyProxiesWithOptions + 560
36m-darwin.so 0x000000010b536911 get_proxy_settings + 24
0x000000010a464081 _PyCFunction_FastCallDict + 526
0x000000010a4c87d7 call_function + 489
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c985e _PyFunction_FastCallDict + 444
0x000000010a42c4d9 _PyObject_FastCallDict + 196
0x000000010a42c5fc _PyObject_Call_Prepend + 156
0x000000010a42c35a PyObject_Call + 101
0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c0207 PyEval_EvalCodeEx + 52
0x000000010a44c493 function_call + 338
0x000000010a42c35a PyObject_Call + 101
0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c9693 fast_function + 227
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c0207 PyEval_EvalCodeEx + 52
0x000000010a44c493 function_call + 338
0x000000010a42c35a PyObject_Call + 101
0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c0207 PyEval_EvalCodeEx + 52
0x000000010a44c493 function_call + 338
0x000000010a42c35a PyObject_Call + 101
0x000000010a4c1825 _PyEval_EvalFrameDefault + 5603
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a42c4d9 _PyObject_FastCallDict + 196
0x000000010a42c5fc _PyObject_Call_Prepend + 156
0x000000010a42c35a PyObject_Call + 101
0x000000010a477052 slot_tp_init + 57
0x000000010a474072 type_call + 184
0x000000010a42c4a4 _PyObject_FastCallDict + 143
0x000000010a4c87a7 call_function + 441
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c985e _PyFunction_FastCallDict + 444
0x000000010a42c4d9 _PyObject_FastCallDict + 196
0x000000010a42c5fc _PyObject_Call_Prepend + 156
0x000000010a42c35a PyObject_Call + 101
0x000000010a477052 slot_tp_init + 57
0x000000010a474072 type_call + 184
0x000000010a42c4a4 _PyObject_FastCallDict + 143
0x000000010a42c84a _PyObject_FastCallKeywords + 97
0x000000010a4c87a7 call_function + 441
0x000000010a4c1665 _PyEval_EvalFrameDefault + 5155
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c9693 fast_function + 227
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c992e _PyFunction_FastCall + 121
0x000000010a4c87ae call_function + 448
0x000000010a4c15ca _PyEval_EvalFrameDefault + 5000
0x000000010a4c8fa7 _PyEval_EvalCodeWithName + 1829
0x000000010a4c01cd PyEval_EvalCode + 43
0x000000010a4e7896 run_mod + 54
0x000000010a4e7b76 PyRun_FileExFlags + 180
0x000000010a4e7103 PyRun_SimpleFileExFlags + 280
0x000000010a4fad40 Py_Main + 3268
0x000000010a41fe1d 0x10a41e000 + 7709
0x00007fffab27c255 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x00007fff557dddf0 rbx: 0x00007fb62371bda0 rcx: 0x0030000000000203 rdx: 0x00007fff557dde20
rdi: 0x000000010b692830 rsi: 0x00007fb62371bda0 rbp: 0x00007fff557ddd90 rsp: 0x00007fff557ddd58
r8: 0x0000000000000001 r9: 0x0000000000000048 r10: 0x00000000ffffffff r11: 0xffffffffb8e7ea1f
r12: 0x00007fffb40ccf58 r13: 0x00007fffab4bb61e r14: 0x00007fff557dde20 r15: 0x00007fb62371bdb0
rip: 0x00007fffab4bb622 rfl: 0x0000000000010206 cr2: 0x000000010b692832

Logical CPU: 1
Error Code: 0x00000004
Trap Number: 14

Binary Images:
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0x10b535000 - 0x10b536fff +_scproxy.cpython-36m-darwin.so (0) <EEE7159D-073D-3FA6-8DA3-284C2D2CA26E> /usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload/_scproxy.cpython-36m-darwin.so
0x10b579000 - 0x10b64dff3 +unicodedata.cpython-36m-darwin.so (0) <FC35726F-4CDA-3F49-83E1-1810F0D65605> /usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/lib-dynload/unicodedata.cpython-36m-darwin.so
0x7fff95ca7000 - 0x7fff96141fff com.apple.CoreFoundation (6.9 - 1348.28) <A40AA224-7A50-3989-95D0-5A228A0E2FAF> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
0x7fff97c89000 - 0x7fff97d1eff7 com.apple.framework.IOKit (2.0.2 - 1324.30.13) <163BE7FA-B29A-348F-8B5F-E301F2E8C964> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x7fff9c1ad000 - 0x7fff9c4ccfff com.apple.security (7.0 - 57740.31.2) <A47D7BAE-0591-3184-8E44-FB2EB08A19C2> /System/Library/Frameworks/Security.framework/Versions/A/Security
0x7fff9c8f7000 - 0x7fff9c968ff7 com.apple.SystemConfiguration (1.14 - 1.14) <D9A57D90-E54F-3E1A-AA2F-F5A694BCE4BB> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
0x7fffa9a9a000 - 0x7fffa9a9bff3 libDiagnosticMessagesClient.dylib (102) <422911A4-E273-3E88-BFC4-DF6470E48242> /usr/lib/libDiagnosticMessagesClient.dylib
0x7fffa9cd3000 - 0x7fffa9cd3fff libOpenScriptingUtil.dylib (172) <D025E180-BB3B-3FFA-98FC-B6835354D723> /usr/lib/libOpenScriptingUtil.dylib
0x7fffa9cd9000 - 0x7fffa9cdaff3 libSystem.B.dylib (1238) <9CB018AF-54E9-300F-82BE-81FE553C9154> /usr/lib/libSystem.B.dylib
0x7fffa9df2000 - 0x7fffa9df2ff3 libauto.dylib (187) <5BBF6A00-CC76-389D-84E7-CA88EDADE683> /usr/lib/libauto.dylib
0x7fffa9df3000 - 0x7fffa9e03ff3 libbsm.0.dylib (34) <20084796-B04D-3B35-A003-EA11459557A9> /usr/lib/libbsm.0.dylib
0x7fffa9e04000 - 0x7fffa9e12ff7 libbz2.1.0.dylib (38) <6FD3B63F-0F86-3A25-BD5B-E243F58792C9> /usr/lib/libbz2.1.0.dylib
0x7fffa9e13000 - 0x7fffa9e69ff7 libc++.1.dylib (307.4) <BEE86868-F831-384C-919E-2B286ACFE87C> /usr/lib/libc++.1.dylib
0x7fffa9e6a000 - 0x7fffa9e94fff libc++abi.dylib (307.2) <1CEF8ABB-7E6D-3C2F-8E0A-E7884478DD23> /usr/lib/libc++abi.dylib
0x7fffa9ebc000 - 0x7fffa9ebcff7 libcoretls.dylib (121.31.1) <BCC32537-4831-3E9F-876E-8C9F4CF52FD3> /usr/lib/libcoretls.dylib
0x7fffa9ebd000 - 0x7fffa9ebeff3 libcoretls_cfhelpers.dylib (121.31.1) <6F37C5AD-7999-3D31-A52F-7AEED935F32D> /usr/lib/libcoretls_cfhelpers.dylib
0x7fffaa2c9000 - 0x7fffaa2c9fff libenergytrace.dylib (15) <A1B040A2-7977-3097-9ADF-34FF181EB970> /usr/lib/libenergytrace.dylib
0x7fffaa3d2000 - 0x7fffaa5f7ffb libicucore.A.dylib (57149.0.1) <6B5FDA93-AA88-318F-9608-C2A33D602EC7> /usr/lib/libicucore.A.dylib
0x7fffaa5ff000 - 0x7fffaa618ffb liblzma.5.dylib (10) <44BD0279-99DD-36B5-8A6E-C11432E2098D> /usr/lib/liblzma.5.dylib
0x7fffaa8d8000 - 0x7fffaa909ffb libncurses.5.4.dylib (51.30.1) <A8C8F837-86A2-3EC2-B2D2-6E8A267847E4> /usr/lib/libncurses.5.4.dylib
0x7fffaa90a000 - 0x7fffaa983ff7 libnetwork.dylib (856.30.16) <66C6E4D6-B39C-3309-80C1-CBBE170DDD51> /usr/lib/libnetwork.dylib
0x7fffaa984000 - 0x7fffaad54d97 libobjc.A.dylib (706) <F9AFE665-A3A2-3285-9495-19803A565861> /usr/lib/libobjc.A.dylib
0x7fffaad57000 - 0x7fffaad5bfff libpam.2.dylib (21.30.1) <71EB0D88-DE84-3C8D-A2C5-58AA282BC5BC> /usr/lib/libpam.2.dylib
0x7fffaad5c000 - 0x7fffaad8cff7 libpcap.A.dylib (67) <450DB888-2C0C-3085-A5F1-69324DFE902C> /usr/lib/libpcap.A.dylib
0x7fffaae16000 - 0x7fffaaf5efe3 libsqlite3.dylib (253) <B5BA5C96-AB13-34A0-8237-DD52A0181DFE> /usr/lib/libsqlite3.dylib
0x7fffab053000 - 0x7fffab060fff libxar.1.dylib (357) <58BFB84B-66FE-3299-AA3D-BBA178ADEE39> /usr/lib/libxar.1.dylib
0x7fffab064000 - 0x7fffab153ffb libxml2.2.dylib (30.11) <E12AF929-0FA5-3214-840F-C81E6AC9F36E> /usr/lib/libxml2.2.dylib
0x7fffab17e000 - 0x7fffab18fff3 libz.1.dylib (67) <46E3FFA2-4328-327A-8D34-A03E20BFFB8E> /usr/lib/libz.1.dylib
0x7fffab19e000 - 0x7fffab1a2ff7 libcache.dylib (79) <0C8092D3-600F-3ADD-A036-F225B6CDCA43> /usr/lib/system/libcache.dylib
0x7fffab1a3000 - 0x7fffab1aeff7 libcommonCrypto.dylib (60092.30.2) <B16E29B6-EC8D-3A8F-9A89-DD9CF35F7C4B> /usr/lib/system/libcommonCrypto.dylib
0x7fffab1af000 - 0x7fffab1b6fff libcompiler_rt.dylib (62) <E992E8D9-037C-3454-A366-A25E4D31D6BB> /usr/lib/system/libcompiler_rt.dylib
0x7fffab1b7000 - 0x7fffab1bffff libcopyfile.dylib (138) <64E285D9-5485-333B-AEE7-8B0C8FB9275F> /usr/lib/system/libcopyfile.dylib
0x7fffab1c0000 - 0x7fffab243fdf libcorecrypto.dylib (442.30.20) <2074B932-FD79-30A9-8E90-AF25C49F2AF1> /usr/lib/system/libcorecrypto.dylib
0x7fffab244000 - 0x7fffab276fff libdispatch.dylib (703.30.5) <EA0CC14E-D559-3802-B4B2-0E8C7579AAC4> /usr/lib/system/libdispatch.dylib
0x7fffab277000 - 0x7fffab27cff3 libdyld.dylib (421.2) <6F506653-FFF6-3DB8-84F1-109AE3C52F32> /usr/lib/system/libdyld.dylib
0x7fffab27d000 - 0x7fffab27dffb libkeymgr.dylib (28) <1A318923-1200-3B06-B432-5007D82F195D> /usr/lib/system/libkeymgr.dylib
0x7fffab27e000 - 0x7fffab28affb libkxld.dylib (3789.41.3) <87550136-9353-348B-9CD9-C342B48C5AAF> /usr/lib/system/libkxld.dylib
0x7fffab28b000 - 0x7fffab28bfff liblaunch.dylib (972.30.7) <15FACC21-079A-3BDF-9AFB-4253EFDEB587> /usr/lib/system/liblaunch.dylib
0x7fffab28c000 - 0x7fffab291fff libmacho.dylib (894) <A2F38EC1-C37C-3B93-B0E4-36B07C177F8C> /usr/lib/system/libmacho.dylib
0x7fffab292000 - 0x7fffab294ff3 libquarantine.dylib (85) <C1D7749F-5F5F-3BB9-BEFC-1F0B9DA941FD> /usr/lib/system/libquarantine.dylib
0x7fffab295000 - 0x7fffab296ffb libremovefile.dylib (45) <CD42974E-BE0B-39FC-9BFC-8A7540A04DC6> /usr/lib/system/libremovefile.dylib
0x7fffab297000 - 0x7fffab2afff7 libsystem_asl.dylib (349.30.2) <EFAC72D7-CB13-3DF7-ADF3-EC6635C6F1EA> /usr/lib/system/libsystem_asl.dylib
0x7fffab2b0000 - 0x7fffab2b0ff7 libsystem_blocks.dylib (67) <B8C3701D-5A91-3D35-999D-2DC8D5393525> /usr/lib/system/libsystem_blocks.dylib
0x7fffab2b1000 - 0x7fffab33efef libsystem_c.dylib (1158.30.7) <2F881962-03CB-3B9D-A782-D98C1BBA4E3D> /usr/lib/system/libsystem_c.dylib
0x7fffab33f000 - 0x7fffab342ffb libsystem_configuration.dylib (888.30.2) <4FE3983C-E4ED-3939-A578-03AD29C99788> /usr/lib/system/libsystem_configuration.dylib
0x7fffab343000 - 0x7fffab346fff libsystem_coreservices.dylib (41.4) <1A572B9E-0C47-320F-8C64-7990D0A5FB5A> /usr/lib/system/libsystem_coreservices.dylib
0x7fffab347000 - 0x7fffab35fff3 libsystem_coretls.dylib (121.31.1) <4676F06D-274D-31BE-B61C-4D7A4AEF4858> /usr/lib/system/libsystem_coretls.dylib
0x7fffab360000 - 0x7fffab366fff libsystem_dnssd.dylib (765.30.11) <DC708D84-ED7D-3936-B996-A67C66B8DDAA> /usr/lib/system/libsystem_dnssd.dylib
0x7fffab367000 - 0x7fffab390ff7 libsystem_info.dylib (503.30.1) <9ED9121C-F111-3FAD-BC2F-C95DEE1C9362> /usr/lib/system/libsystem_info.dylib
0x7fffab391000 - 0x7fffab3b3ff7 libsystem_kernel.dylib (3789.41.3) <B75B128C-7D7A-3318-91CD-82B5A69C5329> /usr/lib/system/libsystem_kernel.dylib
0x7fffab3b4000 - 0x7fffab3fbfe7 libsystem_m.dylib (3121.4) <266DB92B-A86F-3691-80FB-1B26AD73CFF3> /usr/lib/system/libsystem_m.dylib
0x7fffab3fc000 - 0x7fffab41aff7 libsystem_malloc.dylib (116.30.3) <F40DEE3B-386A-3529-A3F7-98117ED55BF4> /usr/lib/system/libsystem_malloc.dylib
0x7fffab41b000 - 0x7fffab472ffb libsystem_network.dylib (856.30.16) <4AE368E9-605D-379D-B04C-2AC7455B8250> /usr/lib/system/libsystem_network.dylib
0x7fffab473000 - 0x7fffab47cff3 libsystem_networkextension.dylib (563.30.15) <EB020B0C-7DF0-3EEF-8E3C-15DA3C01D687> /usr/lib/system/libsystem_networkextension.dylib
0x7fffab47d000 - 0x7fffab486ff3 libsystem_notify.dylib (165.20.1) <E7FD3A7C-DD07-36E2-9FA4-7561F9F114DA> /usr/lib/system/libsystem_notify.dylib
0x7fffab487000 - 0x7fffab48ffe7 libsystem_platform.dylib (126.1.2) <3CA06D4E-C00A-36DE-AA65-3A390097D1F6> /usr/lib/system/libsystem_platform.dylib
0x7fffab490000 - 0x7fffab49aff7 libsystem_pthread.dylib (218.30.1) <C869ED7C-BE29-3532-8E69-3A8DA1447EDC> /usr/lib/system/libsystem_pthread.dylib
0x7fffab49b000 - 0x7fffab49eff7 libsystem_sandbox.dylib (592.31.1) <7BBFDF96-293F-3DD9-B3A4-7C168280B441> /usr/lib/system/libsystem_sandbox.dylib
0x7fffab49f000 - 0x7fffab4a0fff libsystem_secinit.dylib (24) <5C1F1E47-0F7D-3E25-8DEB-D9DB1F902281> /usr/lib/system/libsystem_secinit.dylib
0x7fffab4a1000 - 0x7fffab4a8fff libsystem_symptoms.dylib (532.30.6) <5D990CF5-B58F-39F7-B375-99B4EC62CFBD> /usr/lib/system/libsystem_symptoms.dylib
0x7fffab4a9000 - 0x7fffab4c9ff7 libsystem_trace.dylib (518.30.7) <6D34D1EA-2A3C-3D2D-803E-A666E6AEEE52> /usr/lib/system/libsystem_trace.dylib
0x7fffab4ca000 - 0x7fffab4cfffb libunwind.dylib (35.3) <9F7C2AD8-A9A7-3DE4-828D-B0F0F166AAA0> /usr/lib/system/libunwind.dylib
0x7fffab4d0000 - 0x7fffab4f9ff7 libxpc.dylib (972.30.7) <65E41BB6-EBD5-3D93-B0BE-B190CEE4DD93> /usr/lib/system/libxpc.dylib

External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 871
thread_create: 0
thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=139.6M resident=0K(0%) swapped_out_or_unallocated=139.6M(100%)
Writable regions: Total=76.8M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=76.8M(100%)

                            VIRTUAL   REGION

REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 2
Dispatch continuations 8192K 2
Kernel Alloc Once 8K 2
MALLOC 40.7M 14
MALLOC guard page 16K 4
MALLOC_LARGE (reserved) 128K 2 reserved VM address space (unallocated)
STACK GUARD 4K 2
Stack 17.5M 5
Stack Guard 12K 4
VM_ALLOCATE 10.0M 25
__DATA 4416K 100
__LINKEDIT 112.5M 39
__TEXT 27.1M 99
__UNICODE 556K 2
shared memory 44K 5
=========== ======= =======
TOTAL 221.1M 292
TOTAL, minus reserved VM space 221.0M 292

Model: MacBookPro12,1, BootROM MBP121.0167.B21, 2 processors, Intel Core i5, 2,9 GHz, 16 GB, SMC 2.28f7
Graphics: Intel Iris Graphics 6100, Intel Iris Graphics 6100, Built-In
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x133), Broadcom BCM43xx 1.0 (7.21.171.68.1a5)
Bluetooth: Version 5.0.3f1, 3 services, 17 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SM0512G, 500,28 GB
USB Device: USB 3.0 Bus
USB Device: Hub
USB Device: Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: Microsoft USB Optical Mouse
USB Device: USB2.0 Hub
USB Device: daskeyboard
USB Device: Hub
Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1

gromgull · 2017-05-17T13:07:25Z

I am unable to reduce it to a small(ish) test-case like for 3.6.1, but I can also get 2.7.1 to seg fault in my original program, and the stack trace is similar:

Process: Python [4023]
Path: /usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Identifier: Python
Version: 2.7.11 (2.7.11)
Code Type: X86-64 (Native)
Parent Process: Python [4018]
Responsible: Python [4023]
User ID: 501

Date/Time: 2017-05-17 15:04:48.824 +0200
OS Version: Mac OS X 10.12.3 (16D32)
Report Version: 12
Anonymous UUID: DB16C70B-F979-86B6-864C-0AC84B0E6402

Sleep/Wake UUID: 03D0B108-E764-4834-A88D-7919CAF9B786

Time Awake Since Boot: 3000 seconds

System Integrity Protection: enabled

Crashed Thread: 0 Dispatch queue: com.apple.os.log

Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000010617c832
Exception Note: EXC_CORPSE_NOTIFY

Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]

VM Regions Near 0x10617c832:
VM_ALLOCATE 000000010603c000-000000010617c000 [ 1280K] rw-/rwx SM=COW
-->
VM_ALLOCATE 00000001061bc000-00000001062fc000 [ 1280K] rw-/rwx SM=COW

Application Specific Information:
crashed on child side of fork pre-exec

Thread 0 Crashed:: Dispatch queue: com.apple.os.log
0 libsystem_trace.dylib 0x00007fffab4bb622 _os_log_cmp_key + 4
1 libsystem_c.dylib 0x00007fffab324144 rb_tree_find_node + 58
2 libsystem_trace.dylib 0x00007fffab4bbb5a __os_log_create_block_invoke + 30
3 libdispatch.dylib 0x00007fffab2460b8 _dispatch_client_callout + 8
4 libdispatch.dylib 0x00007fffab246cf2 _dispatch_barrier_sync_f_invoke + 83
5 libsystem_trace.dylib 0x00007fffab4bb8ac os_log_create + 590
6 com.apple.SystemConfiguration 0x00007fff9c8faafa __SCDynamicStoreCheckRetryAndHandleError + 167
7 com.apple.SystemConfiguration 0x00007fff9c8f9e12 SCDynamicStoreCopyValue + 189
8 com.apple.SystemConfiguration 0x00007fff9c8fe6fb SCDynamicStoreCopyProxiesWithOptions + 560
9 _scproxy.so 0x0000000104cb9914 get_proxy_settings + 24
10 org.python.python 0x00000001044c2bfb PyEval_EvalFrameEx + 26904
11 org.python.python 0x00000001044c672d fast_function + 264
12 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
13 org.python.python 0x00000001044c672d fast_function + 264
14 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
15 org.python.python 0x00000001044c672d fast_function + 264
16 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
17 org.python.python 0x00000001044c672d fast_function + 264
18 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
19 org.python.python 0x00000001044c672d fast_function + 264
20 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
21 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
22 org.python.python 0x0000000104460fb1 function_call + 352
23 org.python.python 0x0000000104442eb0 PyObject_Call + 99
24 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
25 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
26 org.python.python 0x0000000104460fb1 function_call + 352
27 org.python.python 0x0000000104442eb0 PyObject_Call + 99
28 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
29 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
30 org.python.python 0x0000000104460fb1 function_call + 352
31 org.python.python 0x0000000104442eb0 PyObject_Call + 99
32 org.python.python 0x000000010444dcb8 instancemethod_call + 173
33 org.python.python 0x0000000104442eb0 PyObject_Call + 99
34 org.python.python 0x00000001044c2a27 PyEval_EvalFrameEx + 26436
35 org.python.python 0x00000001044c672d fast_function + 264
36 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
37 org.python.python 0x00000001044c672d fast_function + 264
38 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
39 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
40 org.python.python 0x00000001044c669a fast_function + 117
41 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
42 org.python.python 0x0000000104458398 gen_send_ex + 191
43 org.python.python 0x00000001044c2cd2 PyEval_EvalFrameEx + 27119
44 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
45 org.python.python 0x00000001044c669a fast_function + 117
46 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
47 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
48 org.python.python 0x0000000104460fb1 function_call + 352
49 org.python.python 0x0000000104442eb0 PyObject_Call + 99
50 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
51 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
52 org.python.python 0x0000000104460fb1 function_call + 352
53 org.python.python 0x0000000104442eb0 PyObject_Call + 99
54 _functools.so 0x00000001048587b7 partial_call + 189
55 org.python.python 0x0000000104442eb0 PyObject_Call + 99
56 org.python.python 0x00000001044c2a27 PyEval_EvalFrameEx + 26436
57 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
58 org.python.python 0x00000001044c669a fast_function + 117
59 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
60 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
61 org.python.python 0x00000001044c669a fast_function + 117
62 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
63 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
64 org.python.python 0x00000001044c669a fast_function + 117
65 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
66 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
67 org.python.python 0x0000000104460fb1 function_call + 352
68 org.python.python 0x0000000104442eb0 PyObject_Call + 99
69 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
70 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
71 org.python.python 0x0000000104460fb1 function_call + 352
72 org.python.python 0x0000000104442eb0 PyObject_Call + 99
73 org.python.python 0x000000010444dcb8 instancemethod_call + 173
74 org.python.python 0x0000000104442eb0 PyObject_Call + 99
75 org.python.python 0x00000001044896f8 slot_tp_call + 61
76 org.python.python 0x0000000104442eb0 PyObject_Call + 99
77 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
78 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
79 org.python.python 0x0000000104460fb1 function_call + 352
80 org.python.python 0x0000000104442eb0 PyObject_Call + 99
81 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
82 org.python.python 0x00000001044c672d fast_function + 264
83 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
84 org.python.python 0x00000001044c672d fast_function + 264
85 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
86 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
87 org.python.python 0x0000000104460fb1 function_call + 352
88 org.python.python 0x0000000104442eb0 PyObject_Call + 99
89 org.python.python 0x000000010444dcb8 instancemethod_call + 173
90 org.python.python 0x0000000104442eb0 PyObject_Call + 99
91 org.python.python 0x000000010448a143 slot_tp_init + 64
92 org.python.python 0x0000000104485954 type_call + 182
93 org.python.python 0x0000000104442eb0 PyObject_Call + 99
94 org.python.python 0x00000001044c2a27 PyEval_EvalFrameEx + 26436
95 org.python.python 0x00000001044c672d fast_function + 264
96 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
97 org.python.python 0x00000001044c672d fast_function + 264
98 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
99 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
100 org.python.python 0x0000000104460fb1 function_call + 352
101 org.python.python 0x0000000104442eb0 PyObject_Call + 99
102 org.python.python 0x000000010444dcb8 instancemethod_call + 173
103 org.python.python 0x0000000104442eb0 PyObject_Call + 99
104 org.python.python 0x000000010448a143 slot_tp_init + 64
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106 org.python.python 0x0000000104442eb0 PyObject_Call + 99
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111 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
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114 org.python.python 0x000000010444dcb8 instancemethod_call + 173
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116 org.python.python 0x000000010448a143 slot_tp_init + 64
117 org.python.python 0x0000000104485954 type_call + 182
118 org.python.python 0x0000000104442eb0 PyObject_Call + 99
119 org.python.python 0x00000001044c2a27 PyEval_EvalFrameEx + 26436
120 org.python.python 0x0000000104458398 gen_send_ex + 191
121 org.python.python 0x00000001044c2cd2 PyEval_EvalFrameEx + 27119
122 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
123 org.python.python 0x00000001044c669a fast_function + 117
124 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
125 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
126 org.python.python 0x0000000104460fb1 function_call + 352
127 org.python.python 0x0000000104442eb0 PyObject_Call + 99
128 org.python.python 0x000000010444dcb8 instancemethod_call + 173
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130 org.python.python 0x000000010448a143 slot_tp_init + 64
131 org.python.python 0x0000000104485954 type_call + 182
132 org.python.python 0x0000000104442eb0 PyObject_Call + 99
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134 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
135 org.python.python 0x0000000104460fb1 function_call + 352
136 org.python.python 0x0000000104442eb0 PyObject_Call + 99
137 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
138 org.python.python 0x0000000104458398 gen_send_ex + 191
139 org.python.python 0x00000001044b98db builtin_next + 105
140 org.python.python 0x00000001044c2bcd PyEval_EvalFrameEx + 26858
141 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
142 org.python.python 0x0000000104460fb1 function_call + 352
143 org.python.python 0x0000000104442eb0 PyObject_Call + 99
144 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
145 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
146 org.python.python 0x00000001044c669a fast_function + 117
147 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
148 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
149 org.python.python 0x00000001044c669a fast_function + 117
150 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
151 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
152 org.python.python 0x00000001044c669a fast_function + 117
153 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
154 org.python.python 0x0000000104458398 gen_send_ex + 191
155 org.python.python 0x00000001044c2cd2 PyEval_EvalFrameEx + 27119
156 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
157 org.python.python 0x00000001044c669a fast_function + 117
158 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
159 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
160 org.python.python 0x0000000104460fb1 function_call + 352
161 org.python.python 0x0000000104442eb0 PyObject_Call + 99
162 org.python.python 0x000000010444dcb8 instancemethod_call + 173
163 org.python.python 0x0000000104442eb0 PyObject_Call + 99
164 org.python.python 0x000000010448a143 slot_tp_init + 64
165 org.python.python 0x0000000104485954 type_call + 182
166 org.python.python 0x0000000104442eb0 PyObject_Call + 99
167 org.python.python 0x00000001044c2a27 PyEval_EvalFrameEx + 26436
168 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
169 org.python.python 0x00000001044c669a fast_function + 117
170 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
171 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
172 org.python.python 0x00000001044c669a fast_function + 117
173 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
174 org.python.python 0x0000000104458398 gen_send_ex + 191
175 org.python.python 0x00000001044b98db builtin_next + 105
176 org.python.python 0x00000001044c2bcd PyEval_EvalFrameEx + 26858
177 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
178 org.python.python 0x00000001044c669a fast_function + 117
179 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
180 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
181 org.python.python 0x00000001044c669a fast_function + 117
182 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
183 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
184 org.python.python 0x00000001044c669a fast_function + 117
185 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
186 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
187 org.python.python 0x00000001044c669a fast_function + 117
188 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
189 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
190 org.python.python 0x0000000104460fb1 function_call + 352
191 org.python.python 0x0000000104442eb0 PyObject_Call + 99
192 org.python.python 0x00000001044c3294 PyEval_EvalFrameEx + 28593
193 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
194 org.python.python 0x00000001044c669a fast_function + 117
195 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
196 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
197 org.python.python 0x00000001044c669a fast_function + 117
198 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
199 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
200 org.python.python 0x00000001044c669a fast_function + 117
201 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
202 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
203 org.python.python 0x00000001044bc4fc PyEval_EvalFrameEx + 537
204 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
205 org.python.python 0x00000001044c669a fast_function + 117
206 org.python.python 0x00000001044c2af3 PyEval_EvalFrameEx + 26640
207 org.python.python 0x00000001044bc0f1 PyEval_EvalCodeEx + 1583
208 org.python.python 0x0000000104460fb1 function_call + 352
209 org.python.python 0x0000000104442eb0 PyObject_Call + 99
210 org.python.python 0x00000001044f165d RunModule + 113
211 org.python.python 0x00000001044f11b3 Py_Main + 2479
212 libdyld.dylib 0x00007fffab27c255 start + 1

Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x00007fff5b7c5e20 rbx: 0x00007fc049a24ca0 rcx: 0x0030000000000203 rdx: 0x00007fff5b7c5e50
rdi: 0x000000010617c830 rsi: 0x00007fc049a24ca0 rbp: 0x00007fff5b7c5dc0 rsp: 0x00007fff5b7c5d88
r8: 0x0000000000000001 r9: 0x0000000000000048 r10: 0x00000000ffffffff r11: 0xffffffffbee66a4f
r12: 0x00007fffb40ccf58 r13: 0x00007fffab4bb61e r14: 0x00007fff5b7c5e50 r15: 0x00007fc049a24cb0
rip: 0x00007fffab4bb622 rfl: 0x0000000000010206 cr2: 0x000000010617c832

Logical CPU: 3
Error Code: 0x00000004
Trap Number: 14

Binary Images:
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0x7fffa9cd3000 - 0x7fffa9cd3fff libOpenScriptingUtil.dylib (172) <D025E180-BB3B-3FFA-98FC-B6835354D723> /usr/lib/libOpenScriptingUtil.dylib
0x7fffa9cd9000 - 0x7fffa9cdaff3 libSystem.B.dylib (1238) <9CB018AF-54E9-300F-82BE-81FE553C9154> /usr/lib/libSystem.B.dylib
0x7fffa9df2000 - 0x7fffa9df2ff3 libauto.dylib (187) <5BBF6A00-CC76-389D-84E7-CA88EDADE683> /usr/lib/libauto.dylib
0x7fffa9df3000 - 0x7fffa9e03ff3 libbsm.0.dylib (34) <20084796-B04D-3B35-A003-EA11459557A9> /usr/lib/libbsm.0.dylib
0x7fffa9e04000 - 0x7fffa9e12ff7 libbz2.1.0.dylib (38) <6FD3B63F-0F86-3A25-BD5B-E243F58792C9> /usr/lib/libbz2.1.0.dylib
0x7fffa9e13000 - 0x7fffa9e69ff7 libc++.1.dylib (307.4) <BEE86868-F831-384C-919E-2B286ACFE87C> /usr/lib/libc++.1.dylib
0x7fffa9e6a000 - 0x7fffa9e94fff libc++abi.dylib (307.2) <1CEF8ABB-7E6D-3C2F-8E0A-E7884478DD23> /usr/lib/libc++abi.dylib
0x7fffa9ebc000 - 0x7fffa9ebcff7 libcoretls.dylib (121.31.1) <BCC32537-4831-3E9F-876E-8C9F4CF52FD3> /usr/lib/libcoretls.dylib
0x7fffa9ebd000 - 0x7fffa9ebeff3 libcoretls_cfhelpers.dylib (121.31.1) <6F37C5AD-7999-3D31-A52F-7AEED935F32D> /usr/lib/libcoretls_cfhelpers.dylib
0x7fffaa2c9000 - 0x7fffaa2c9fff libenergytrace.dylib (15) <A1B040A2-7977-3097-9ADF-34FF181EB970> /usr/lib/libenergytrace.dylib
0x7fffaa2ca000 - 0x7fffaa2d6ffb libexslt.0.dylib (15.8) <9910CD52-0A64-3992-B540-D7D38C626209> /usr/lib/libexslt.0.dylib
0x7fffaa2d7000 - 0x7fffaa2d8fff libffi.dylib (18.1) <49D03682-E111-351C-8266-4519B3B82BE9> /usr/lib/libffi.dylib
0x7fffaa3d2000 - 0x7fffaa5f7ffb libicucore.A.dylib (57149.0.1) <6B5FDA93-AA88-318F-9608-C2A33D602EC7> /usr/lib/libicucore.A.dylib
0x7fffaa5ff000 - 0x7fffaa618ffb liblzma.5.dylib (10) <44BD0279-99DD-36B5-8A6E-C11432E2098D> /usr/lib/liblzma.5.dylib
0x7fffaa8d8000 - 0x7fffaa909ffb libncurses.5.4.dylib (51.30.1) <A8C8F837-86A2-3EC2-B2D2-6E8A267847E4> /usr/lib/libncurses.5.4.dylib
0x7fffaa90a000 - 0x7fffaa983ff7 libnetwork.dylib (856.30.16) <66C6E4D6-B39C-3309-80C1-CBBE170DDD51> /usr/lib/libnetwork.dylib
0x7fffaa984000 - 0x7fffaad54d97 libobjc.A.dylib (706) <F9AFE665-A3A2-3285-9495-19803A565861> /usr/lib/libobjc.A.dylib
0x7fffaad57000 - 0x7fffaad5bfff libpam.2.dylib (21.30.1) <71EB0D88-DE84-3C8D-A2C5-58AA282BC5BC> /usr/lib/libpam.2.dylib
0x7fffaad5c000 - 0x7fffaad8cff7 libpcap.A.dylib (67) <450DB888-2C0C-3085-A5F1-69324DFE902C> /usr/lib/libpcap.A.dylib
0x7fffaae16000 - 0x7fffaaf5efe3 libsqlite3.dylib (253) <B5BA5C96-AB13-34A0-8237-DD52A0181DFE> /usr/lib/libsqlite3.dylib
0x7fffab053000 - 0x7fffab060fff libxar.1.dylib (357) <58BFB84B-66FE-3299-AA3D-BBA178ADEE39> /usr/lib/libxar.1.dylib
0x7fffab064000 - 0x7fffab153ffb libxml2.2.dylib (30.11) <E12AF929-0FA5-3214-840F-C81E6AC9F36E> /usr/lib/libxml2.2.dylib
0x7fffab154000 - 0x7fffab17dfff libxslt.1.dylib (15.8) <FFF5DD45-F544-34B2-BE3C-DB877DC60081> /usr/lib/libxslt.1.dylib
0x7fffab17e000 - 0x7fffab18fff3 libz.1.dylib (67) <46E3FFA2-4328-327A-8D34-A03E20BFFB8E> /usr/lib/libz.1.dylib
0x7fffab19e000 - 0x7fffab1a2ff7 libcache.dylib (79) <0C8092D3-600F-3ADD-A036-F225B6CDCA43> /usr/lib/system/libcache.dylib
0x7fffab1a3000 - 0x7fffab1aeff7 libcommonCrypto.dylib (60092.30.2) <B16E29B6-EC8D-3A8F-9A89-DD9CF35F7C4B> /usr/lib/system/libcommonCrypto.dylib
0x7fffab1af000 - 0x7fffab1b6fff libcompiler_rt.dylib (62) <E992E8D9-037C-3454-A366-A25E4D31D6BB> /usr/lib/system/libcompiler_rt.dylib
0x7fffab1b7000 - 0x7fffab1bffff libcopyfile.dylib (138) <64E285D9-5485-333B-AEE7-8B0C8FB9275F> /usr/lib/system/libcopyfile.dylib
0x7fffab1c0000 - 0x7fffab243fdf libcorecrypto.dylib (442.30.20) <2074B932-FD79-30A9-8E90-AF25C49F2AF1> /usr/lib/system/libcorecrypto.dylib
0x7fffab244000 - 0x7fffab276fff libdispatch.dylib (703.30.5) <EA0CC14E-D559-3802-B4B2-0E8C7579AAC4> /usr/lib/system/libdispatch.dylib
0x7fffab277000 - 0x7fffab27cff3 libdyld.dylib (421.2) <6F506653-FFF6-3DB8-84F1-109AE3C52F32> /usr/lib/system/libdyld.dylib
0x7fffab27d000 - 0x7fffab27dffb libkeymgr.dylib (28) <1A318923-1200-3B06-B432-5007D82F195D> /usr/lib/system/libkeymgr.dylib
0x7fffab27e000 - 0x7fffab28affb libkxld.dylib (3789.41.3) <87550136-9353-348B-9CD9-C342B48C5AAF> /usr/lib/system/libkxld.dylib
0x7fffab28b000 - 0x7fffab28bfff liblaunch.dylib (972.30.7) <15FACC21-079A-3BDF-9AFB-4253EFDEB587> /usr/lib/system/liblaunch.dylib
0x7fffab28c000 - 0x7fffab291fff libmacho.dylib (894) <A2F38EC1-C37C-3B93-B0E4-36B07C177F8C> /usr/lib/system/libmacho.dylib
0x7fffab292000 - 0x7fffab294ff3 libquarantine.dylib (85) <C1D7749F-5F5F-3BB9-BEFC-1F0B9DA941FD> /usr/lib/system/libquarantine.dylib
0x7fffab295000 - 0x7fffab296ffb libremovefile.dylib (45) <CD42974E-BE0B-39FC-9BFC-8A7540A04DC6> /usr/lib/system/libremovefile.dylib
0x7fffab297000 - 0x7fffab2afff7 libsystem_asl.dylib (349.30.2) <EFAC72D7-CB13-3DF7-ADF3-EC6635C6F1EA> /usr/lib/system/libsystem_asl.dylib
0x7fffab2b0000 - 0x7fffab2b0ff7 libsystem_blocks.dylib (67) <B8C3701D-5A91-3D35-999D-2DC8D5393525> /usr/lib/system/libsystem_blocks.dylib
0x7fffab2b1000 - 0x7fffab33efef libsystem_c.dylib (1158.30.7) <2F881962-03CB-3B9D-A782-D98C1BBA4E3D> /usr/lib/system/libsystem_c.dylib
0x7fffab33f000 - 0x7fffab342ffb libsystem_configuration.dylib (888.30.2) <4FE3983C-E4ED-3939-A578-03AD29C99788> /usr/lib/system/libsystem_configuration.dylib
0x7fffab343000 - 0x7fffab346fff libsystem_coreservices.dylib (41.4) <1A572B9E-0C47-320F-8C64-7990D0A5FB5A> /usr/lib/system/libsystem_coreservices.dylib
0x7fffab347000 - 0x7fffab35fff3 libsystem_coretls.dylib (121.31.1) <4676F06D-274D-31BE-B61C-4D7A4AEF4858> /usr/lib/system/libsystem_coretls.dylib
0x7fffab360000 - 0x7fffab366fff libsystem_dnssd.dylib (765.30.11) <DC708D84-ED7D-3936-B996-A67C66B8DDAA> /usr/lib/system/libsystem_dnssd.dylib
0x7fffab367000 - 0x7fffab390ff7 libsystem_info.dylib (503.30.1) <9ED9121C-F111-3FAD-BC2F-C95DEE1C9362> /usr/lib/system/libsystem_info.dylib
0x7fffab391000 - 0x7fffab3b3ff7 libsystem_kernel.dylib (3789.41.3) <B75B128C-7D7A-3318-91CD-82B5A69C5329> /usr/lib/system/libsystem_kernel.dylib
0x7fffab3b4000 - 0x7fffab3fbfe7 libsystem_m.dylib (3121.4) <266DB92B-A86F-3691-80FB-1B26AD73CFF3> /usr/lib/system/libsystem_m.dylib
0x7fffab3fc000 - 0x7fffab41aff7 libsystem_malloc.dylib (116.30.3) <F40DEE3B-386A-3529-A3F7-98117ED55BF4> /usr/lib/system/libsystem_malloc.dylib
0x7fffab41b000 - 0x7fffab472ffb libsystem_network.dylib (856.30.16) <4AE368E9-605D-379D-B04C-2AC7455B8250> /usr/lib/system/libsystem_network.dylib
0x7fffab473000 - 0x7fffab47cff3 libsystem_networkextension.dylib (563.30.15) <EB020B0C-7DF0-3EEF-8E3C-15DA3C01D687> /usr/lib/system/libsystem_networkextension.dylib
0x7fffab47d000 - 0x7fffab486ff3 libsystem_notify.dylib (165.20.1) <E7FD3A7C-DD07-36E2-9FA4-7561F9F114DA> /usr/lib/system/libsystem_notify.dylib
0x7fffab487000 - 0x7fffab48ffe7 libsystem_platform.dylib (126.1.2) <3CA06D4E-C00A-36DE-AA65-3A390097D1F6> /usr/lib/system/libsystem_platform.dylib
0x7fffab490000 - 0x7fffab49aff7 libsystem_pthread.dylib (218.30.1) <C869ED7C-BE29-3532-8E69-3A8DA1447EDC> /usr/lib/system/libsystem_pthread.dylib
0x7fffab49b000 - 0x7fffab49eff7 libsystem_sandbox.dylib (592.31.1) <7BBFDF96-293F-3DD9-B3A4-7C168280B441> /usr/lib/system/libsystem_sandbox.dylib
0x7fffab49f000 - 0x7fffab4a0fff libsystem_secinit.dylib (24) <5C1F1E47-0F7D-3E25-8DEB-D9DB1F902281> /usr/lib/system/libsystem_secinit.dylib
0x7fffab4a1000 - 0x7fffab4a8fff libsystem_symptoms.dylib (532.30.6) <5D990CF5-B58F-39F7-B375-99B4EC62CFBD> /usr/lib/system/libsystem_symptoms.dylib
0x7fffab4a9000 - 0x7fffab4c9ff7 libsystem_trace.dylib (518.30.7) <6D34D1EA-2A3C-3D2D-803E-A666E6AEEE52> /usr/lib/system/libsystem_trace.dylib
0x7fffab4ca000 - 0x7fffab4cfffb libunwind.dylib (35.3) <9F7C2AD8-A9A7-3DE4-828D-B0F0F166AAA0> /usr/lib/system/libunwind.dylib
0x7fffab4d0000 - 0x7fffab4f9ff7 libxpc.dylib (972.30.7) <65E41BB6-EBD5-3D93-B0BE-B190CEE4DD93> /usr/lib/system/libxpc.dylib

External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 2716
thread_create: 0
thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=142.2M resident=0K(0%) swapped_out_or_unallocated=142.2M(100%)
Writable regions: Total=101.7M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=101.7M(100%)

                            VIRTUAL   REGION

REGION TYPE SIZE COUNT (non-coalesced)
=========== ======= =======
Activity Tracing 256K 2
Dispatch continuations 8192K 2
Kernel Alloc Once 8K 2
MALLOC 61.6M 16
MALLOC guard page 16K 4
STACK GUARD 56.0M 2
Stack 9752K 5
Stack Guard 12K 4
VM_ALLOCATE 22.3M 34
__DATA 4580K 118
__LINKEDIT 113.3M 51
__TEXT 28.9M 114
__UNICODE 556K 2
shared memory 44K 6
=========== ======= =======
TOTAL 304.9M 348

Model: MacBookPro12,1, BootROM MBP121.0167.B21, 2 processors, Intel Core i5, 2,9 GHz, 16 GB, SMC 2.28f7
Graphics: Intel Iris Graphics 6100, Intel Iris Graphics 6100, Built-In
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1867 MHz, 0x02FE, 0x4544464232333241314D412D4A442D460000
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x133), Broadcom BCM43xx 1.0 (7.21.171.68.1a5)
Bluetooth: Version 5.0.3f1, 3 services, 17 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SM0512G, 500,28 GB
USB Device: USB 3.0 Bus
USB Device: Hub
USB Device: Hub
USB Device: Bluetooth USB Host Controller
USB Device: Hub
USB Device: Microsoft USB Optical Mouse
USB Device: USB2.0 Hub
USB Device: daskeyboard
USB Device: Hub
Thunderbolt Bus: MacBook Pro, Apple Inc., 27.1

Birne94 · 2017-05-19T12:33:02Z

I am currently (occasionally) running into the same problem, using Python 3.6.0 on OSX 10.12.3.

I cannot reproduce this segmentation fault reliably, it happens after running for a while in production. This appears to be similar to bpo-13829.

python traceback (trimmed):

Fatal Python error: Segmentation fault

Current thread 0x00007000065fb000 (most recent call first):
File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 2592 in proxy_bypass_macosx_sysconf
File "/usr/local/Cellar/python3/3.6.0_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/urllib/request.py", line 2616 in proxy_bypass
File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/utils.py", line 677 in should_bypass_proxies
File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/utils.py", line 693 in get_environ_proxies
File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/sessions.py", line 686 in merge_environment_settings
File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/sessions.py", line 509 in request
File "/Users/daniel/Workspace/venv/lib/python3.6/site-packages/requests/api.py", line 58 in request

crash dump traceback (trimmed):

thread Support "bpo-" in Misc/NEWS #1: tid = 0x0000, 0x00007fffc1ef0dd6 libsystem_kernel.dylib`__pthread_kill + 10, stop reason = signal SIGSTOP
- frame #0: 0x00007fffc1ef0dd6 libsystem_kernel.dylib__pthread_kill + 10 frame #1: 0x00007fffc1fdc787 libsystem_pthread.dylibpthread_kill + 90
  frame Rename README to README.rst and enhance formatting #2: 0x00007fffc1e07497 libsystem_c.dylibraise + 26 frame #3: 0x00007fffc1fcfbba libsystem_platform.dylib_sigtramp + 26
  frame Update Python Software Foundation Copyright Year. #4: 0x00007fffc1da188f libdispatch.dylib_dispatch_queue_push + 172 frame #5: 0x00007fffc1d91572 libdispatch.dylib_dispatch_mach_msg_send + 657
  frame Add Pycharm's .idea directory to gitignore #6: 0x00007fffc1d924ba libdispatch.dylib_dispatch_mach_send_drain + 280 frame #7: 0x00007fffc1da91ea libdispatch.dylib_dispatch_mach_send_push_and_trydrain + 487
  frame Change some mercurial/ hg.python.org references. #8: 0x00007fffc1da6745 libdispatch.dylib_dispatch_mach_send_msg + 282 frame #9: 0x00007fffc1da6804 libdispatch.dylibdispatch_mach_send_with_result + 50
  frame bpo-29474: Improve documentation for weakref.WeakValueDictionary #10: 0x00007fffc201f25e libxpc.dylib_xpc_connection_enqueue + 104 frame #11: 0x00007fffc201eca3 libxpc.dylibxpc_connection_send_message_with_reply + 152
  frame bpo-29524: Add Objects/call.c file #12: 0x00007fffac99b8e5 CoreFoundation__80-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:]_block_invoke_2 + 133 frame #13: 0x00007fffac9cb4e4 CoreFoundation-[_CFXPreferences withConnectionForRole:performBlock:] + 36
  frame Disable Travis docs job until a fix is found #14: 0x00007fffac99b817 CoreFoundation__80-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:]_block_invoke + 199 frame #15: 0x00007fffac99b662 CoreFoundation-[CFPrefsSearchListSource alreadylocked_generationCountFromListOfSources:count:] + 226
  frame Make Travis docs build more lenient #16: 0x00007fffac81ee80 CoreFoundation-[CFPrefsSearchListSource alreadylocked_copyDictionary] + 336 frame #17: 0x00007fffac81eb5c CoreFoundation-[CFPrefsSearchListSource alreadylocked_copyValueForKey:] + 60
  frame Rename Doc/README.txt to Doc/README.rst #18: 0x00007fffac94dd75 CoreFoundation-[CFPrefsSource copyValueForKey:] + 53 frame #19: 0x00007fffac9c9b00 CoreFoundation__76-[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:]_block_invoke + 32
  frame Update link destination of the Mersenne Twister homepage #20: 0x00007fffac99ca32 CoreFoundation__108-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:]_block_invoke + 290 frame #21: 0x00007fffac99c8a9 CoreFoundation-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:] + 345
  frame [backport to 3.6] bpo-29474: Improve documentation for weakref.WeakValueDictionary #22: 0x00007fffac9c9a66 CoreFoundation-[_CFXPreferences copyAppValueForKey:identifier:container:configurationURL:] + 310 frame #23: 0x00007fffb343a56f SystemConfigurationSCDynamicStoreCopyProxiesWithOptions + 164
  frame bpo-28837: Fix lib2to3 handling of map/zip/filter #24: 0x000000010b36f926 _scproxy.cpython-36m-darwin.soget_proxy_settings + 24 frame #25: 0x000000010942148b Python_PyCFunction_FastCallDict + 529
  frame [backport to 3.5] bpo-29529: Add .travis.yml to 3.5 branch #26: 0x0000000109488959 Pythoncall_function + 562 frame #27: 0x0000000109485d10 Python_PyEval_EvalFrameDefault + 26835

ned-deily · 2017-05-19T15:21:24Z

Unfortunately, his is a long standing problem when using Python applications that fork on macOS and that end up calling certain system frameworks that under the covers use the system libdispatch which is not fork safe. In this case, it is most likely due to a call to s urllib function that results in a call to Python's helper module _scproxy to query the macOS system configuration for network proxies. If your application and system are not using a proxy, the simplest workaround is to disable network proxy lookups by defining the environment variable 'no_proxy' with value '*' in the Python process, for example:

env no_proxy='*' python3.6 ...

Otherwise, restructuring your code to ensure network initialization occurs in the main thread before any forking *might* also prevent the segfault.

gromgull · 2017-05-22T09:33:46Z

Adding env no_proxy='*' does indeed fix it!

Thanks a lot!

I guess it's pretty hard to fix. Or even to detect, so that one could log a warning before dying :(

PythonCoderAS · 2019-11-01T11:41:59Z

A pythonic way to do it is os.environ[“no_proxy”]=“*”

ed2050 · 2022-06-10T13:12:48Z

thanks for the info. previous comment shows why double quotes should not be used as string delimiters. paste that line in a python script and see what happens.

here's the proper form: os.environ ['no_proxy'] = '*'

See python/cpython#74570 (comment)

gromgull mannequin added OS-mac type-crash A hard crash of the interpreter, possibly with a core dump labels May 17, 2017

ned-deily closed this as completed May 19, 2017

ezio-melotti transferred this issue from another repository Apr 10, 2022

abdelrahman-thafeer mentioned this issue Jul 11, 2022

Fix is_verified not stored in PotentialSecret Yelp/detect-secrets#578

Merged

arkivm mentioned this issue Sep 28, 2022

python3Packages.debugpy: fix thread crashes in tests on aarch64-darwin NixOS/nixpkgs#193254

Merged

13 tasks

haoch mentioned this issue Nov 7, 2022

Gunicorn worker's spawn method causes python crash on OSX when using requests package benoitc/gunicorn#2261

Open

mxsasha added a commit to irrdnet/irrd that referenced this issue Jan 18, 2023

Fix segfault under Mac OS by setting no_proxy=*

95a78aa

See python/cpython#74570 (comment)

mxsasha mentioned this issue Jan 18, 2023

Fix segfault under Mac OS by setting no_proxy=* irrdnet/irrd#735

Merged

mxsasha added a commit to irrdnet/irrd that referenced this issue Jan 18, 2023

Fix segfault under Mac OS by setting no_proxy=*

c879698

See python/cpython#74570 (comment)

mxsasha added a commit to irrdnet/irrd that referenced this issue Jan 18, 2023

Fix segfault under Mac OS by setting no_proxy=* (#735)

03dc845

See python/cpython#74570 (comment)

alinabuzachis mentioned this issue Jan 27, 2023

"ERROR! A worker was found in a dead state" When using aws_secret lookup module on MacOS ansible-collections/amazon.aws#1339

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J-Siu mentioned this issue Aug 3, 2024

Crashed on macOS 14 due to dirty fork() state caused by unecessary importing gi virt-manager/virt-manager#620

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sowmyadn010501 mentioned this issue Dec 2, 2024

Segmentation fault when using requests/pynetbox with pyATS on Apple Silicon macOS CiscoTestAutomation/pyats#252

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Segfault on OSX with 3.6.1 #74570

Segfault on OSX with 3.6.1 #74570

gromgull mannequin commented May 17, 2017

gromgull mannequin commented May 17, 2017

gromgull mannequin commented May 17, 2017

Birne94 mannequin commented May 19, 2017

ned-deily commented May 19, 2017

gromgull mannequin commented May 22, 2017

PythonCoderAS mannequin commented Nov 1, 2019

ed2050 commented Jun 10, 2022

Segfault on OSX with 3.6.1 #74570

Segfault on OSX with 3.6.1 #74570

Comments

gromgull mannequin commented May 17, 2017

gromgull mannequin commented May 17, 2017

gromgull mannequin commented May 17, 2017

Birne94 mannequin commented May 19, 2017

ned-deily commented May 19, 2017

gromgull mannequin commented May 22, 2017

PythonCoderAS mannequin commented Nov 1, 2019

ed2050 commented Jun 10, 2022