crash receiving UDP data with rubymotion

[cthree]

When using CAS (GCD) with rubymotion (via CocoaPods) I get a crash when data is received on the socket and the udpSocket:didReceiveData:fromAddress:withFilterContext delegate method is called.

Wireshark shows the message being send and received over the wire.

Code is here:

https://gist.github.com/4161228

Here is the output:

$ rake simulator debug=1
     Build ./build/iPhoneSimulator-6.0-Development
     Build vendor/Pods
  Simulate ./build/iPhoneSimulator-6.0-Development/Lity.app
Attaching to process 69985.
Reading symbols for shared libraries . done
0x8fe95030 in __dyld__dyld_start ()
Function "rb_exc_raise" not defined.
Breakpoint 1 (rb_exc_raise) pending.
Function "malloc_error_break" not defined.
Breakpoint 2 (malloc_error_break) pending.
Reading symbols for shared libraries ........................................................................................................................ done
Breakpoint 1 at 0x6db46
Pending breakpoint 1 - "rb_exc_raise" resolved
Breakpoint 2 at 0x9365481b
Pending breakpoint 2 - "malloc_error_break" resolved
Reading symbols for shared libraries warning: Could not find object file "/Volumes/MacintoshHD/Sources/Cocoa/SIMBL/SafariTabs_plugin/GlimsLoaderMinimal/build/GlimsLoaderMinimal.build/Release/GlimsLoaderMinimal.build/Objects-normal/i386/GlimsLoaderMinimal.o" - no debug information available for "GlimsLoaderMinimal.cp".

. done
Reading symbols for shared libraries . done
Reading symbols for shared libraries . done
Socket Ready
SSDP M-SEARCH Message Sent

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000017
[Switching to process 69985 thread 0x1303]
0x00000017 in ?? ()

[cthree]

Here is the backtrace:

#0  0x00000017 in ?? ()
Cannot access memory at address 0x17
#1  0x025010bd in _dispatch_queue_push_list_slow2 ()
#2  0x02500868 in _dispatch_async_f_slow ()
#3  0x0250033a in dispatch_async_f ()
#4  0x0250094b in dispatch_async ()
#5  0x00019e26 in -[GCDAsyncUdpSocket notifyDidReceiveData:fromAddress:withFilterContext:] (self=0x9532170, _cmd=0x13f4bd, data=0x9538ba0, address=0x9539760, context=0x0) at /Volumes/Home/cthree/Projects/cas_crash/vendor/Pods/CocoaAsyncSocket/GCD/GCDAsyncUdpSocket.m:974
#6  0x000270bb in -[GCDAsyncUdpSocket doReceive] (self=0x9532170) at /Volumes/Home/cthree/Projects/cas_crash/vendor/Pods/CocoaAsyncSocket/GCD/GCDAsyncUdpSocket.m:4457
#7  0x0001ce5b in __57-[GCDAsyncUdpSocket setupSendAndReceiveSourcesForSocket4]_block_invoke_0315 (.block_descriptor=0x95388e0) at /Volumes/Home/cthree/Projects/cas_crash/vendor/Pods/CocoaAsyncSocket/GCD/GCDAsyncUdpSocket.m:1756
#8  0x02511014 in _dispatch_client_callout ()
#9  0x025088b7 in _dispatch_source_latch_and_call ()
#10 0x02504405 in _dispatch_source_invoke ()
#11 0x025013ab in _dispatch_queue_drain ()
#12 0x025012a6 in _dispatch_queue_invoke ()
#13 0x02502280 in _dispatch_root_queue_drain ()
#14 0x02502450 in _dispatch_worker_thread2 ()
#15 0x9363de12 in _pthread_wqthread ()
#16 0x93625cca in start_wqthread ()

And the crash log:

Process:         cas_crash [77668]
Path:            /Users/USER/Library/Application Support/iPhone Simulator/*/cas_crash.app/cas_crash
Identifier:      cas_crash
Version:         0
Code Type:       X86 (Native)
Parent Process:  launchd [140]
User ID:         501

Date/Time:       2012-11-29 10:44:16.358 -0500
OS Version:      Mac OS X 10.8.2 (12C60)
Report Version:  10

Crashed Thread:  2  Dispatch queue: GCDAsyncUdpSocket

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000017

VM Regions Near 0x17:
--> __PAGEZERO             0000000000000000-0000000000001000 [    4K] ---/--- SM=NUL  /Users/USER/Library/Application Support/iPhone Simulator/*/cas_crash.app/cas_crash
    __TEXT                 0000000000001000-0000000000171000 [ 1472K] r-x/rwx SM=COW  /Users/USER/Library/Application Support/iPhone Simulator/*/cas_crash.app/cas_crash

Application Specific Information:
iPhone Simulator 358.4, iPhone OS 6.0 (iPhone/10A403)


Thread 0:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib          0x9741a7d2 mach_msg_trap + 10
1   libsystem_kernel.dylib          0x97419cb0 mach_msg + 68
2   CoreFoundation                  0x0182ba49 __CFRunLoopServiceMachPort + 185
3   CoreFoundation                  0x0183084b __CFRunLoopRun + 1243
4   CoreFoundation                  0x0182ff44 CFRunLoopRunSpecific + 276
5   CoreFoundation                  0x0182fe1b CFRunLoopRunInMode + 123
6   GraphicsServices                0x02ca97e3 GSEventRunModal + 88
7   GraphicsServices                0x02ca9668 GSEventRun + 104
8   UIKit                           0x0056c65c UIApplicationMain + 1211
9   cas_crash                       0x0003a2b7 main + 215
10  cas_crash                       0x0003a0b1 start + 53

Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0   libsystem_kernel.dylib          0x9741d9ca kevent64 + 10
1   libdispatch.dylib               0x02504c2b _dispatch_mgr_invoke + 863
2   libdispatch.dylib               0x025048cc _dispatch_mgr_thread + 61

Thread 2 Crashed:: Dispatch queue: GCDAsyncUdpSocket
0   ???                             0x00000017 0 + 23
1   libdispatch.dylib               0x02501142 _dispatch_wakeup + 40
2   libdispatch.dylib               0x025010bd _dispatch_queue_push_list_slow2 + 43
3   libdispatch.dylib               0x02500868 _dispatch_async_f_slow + 71
4   libdispatch.dylib               0x0250033a dispatch_async_f + 145
5   libdispatch.dylib               0x0250094b dispatch_async + 49
6   cas_crash                       0x00019e26 -[GCDAsyncUdpSocket notifyDidReceiveData:fromAddress:withFilterContext:] + 253
7   cas_crash                       0x000270bb -[GCDAsyncUdpSocket doReceive] + 2338
8   cas_crash                       0x0001ce5b __57-[GCDAsyncUdpSocket setupSendAndReceiveSourcesForSocket4]_block_invoke_0315 + 90
9   libdispatch.dylib               0x02511014 _dispatch_client_callout + 14
10  libdispatch.dylib               0x025088b7 _dispatch_source_latch_and_call + 219
11  libdispatch.dylib               0x02504405 _dispatch_source_invoke + 322
12  libdispatch.dylib               0x025013ab _dispatch_queue_drain + 130
13  libdispatch.dylib               0x025012a6 _dispatch_queue_invoke + 59
14  libdispatch.dylib               0x02502280 _dispatch_root_queue_drain + 231
15  libdispatch.dylib               0x02502450 _dispatch_worker_thread2 + 39
16  libsystem_c.dylib               0x9363de12 _pthread_wqthread + 441
17  libsystem_c.dylib               0x93625cca start_wqthread + 30

Thread 3:
0   libsystem_kernel.dylib          0x9741cb3e __recvfrom + 10
1   libsystem_sim_c.dylib           0x025988d8 recv + 54
2   cas_crash                       0x00126eff -[RMREPL receiveString] + 63
3   cas_crash                       0x00126df2 -[RMREPL start] + 146
4   Foundation                      0x0124f0d5 -[NSThread main] + 76
5   Foundation                      0x0124f034 __NSThread__main__ + 1304
6   libsystem_c.dylib               0x9363b557 _pthread_start + 344
7   libsystem_c.dylib               0x93625cee thread_start + 34

Thread 4:: WebThread
0   libsystem_kernel.dylib          0x9741a7d2 mach_msg_trap + 10
1   libsystem_kernel.dylib          0x97419cb0 mach_msg + 68
2   CoreFoundation                  0x0182ba49 __CFRunLoopServiceMachPort + 185
3   CoreFoundation                  0x018308d4 __CFRunLoopRun + 1380
4   CoreFoundation                  0x0182ff44 CFRunLoopRunSpecific + 276
5   CoreFoundation                  0x0182fe1b CFRunLoopRunInMode + 123
6   WebCore                         0x03d0d310 RunWebThread(void*) + 608
7   libsystem_c.dylib               0x9363b557 _pthread_start + 344
8   libsystem_c.dylib               0x93625cee thread_start + 34

Thread 5:
0   libsystem_kernel.dylib          0x9741d0ee __workq_kernreturn + 10
1   libsystem_c.dylib               0x9363e04c _pthread_workq_return + 45
2   libsystem_c.dylib               0x9363de19 _pthread_wqthread + 448
3   libsystem_c.dylib               0x93625cca start_wqthread + 30

Thread 2 crashed with X86 Thread State (32-bit):
  eax: 0x07306a90  ebx: 0xb0092c20  ecx: 0x00000017  edx: 0x07532f00
  edi: 0x07306ab0  esi: 0x00000000  ebp: 0xb0092c18  esp: 0xb0092bec
   ss: 0x00000023  efl: 0x00010297  eip: 0x00000017   cs: 0x0000001b
   ds: 0x00000023   es: 0x00000023   fs: 0x00000023   gs: 0x0000000f
  cr2: 0x00000017
Logical CPU: 0

Binary Images:
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 0x3004000 -  0x4437ff3 +WebCore (1640) <D33362B4-23C9-3F73-849E-5B5689CF276D> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/PrivateFrameworks/WebCore.framework/WebCore
 0x4c18000 -  0x4cc0ff7 +ProofReader (180) <DBA9674A-FEEC-3D21-A479-5407E72BBC10> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/PrivateFrameworks/ProofReader.framework/ProofReader
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 0x4cec000 -  0x4d23ff7 +PrintKit (109) <035CD3B7-6D30-3575-A51A-4B938499E55E> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/PrivateFrameworks/PrintKit.framework/PrintKit
 0x4d3a000 -  0x4d49ff7 +libMobileGestalt.dylib (154) <1524F86E-1175-310F-AB3C-370E96CBC16E> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/usr/lib/libMobileGestalt.dylib
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 0x4e94000 -  0x4ea7ffb +libbsm.0.dylib (28) <2503C190-0D01-3D5B-B85E-D01BCA738FBC> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/usr/lib/libbsm.0.dylib
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 0x64f0000 -  0x65a0ff3 +CoreTelephony (1384.11) <720A6454-9356-35DE-A277-EDC8AAFD21AE> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/Frameworks/CoreTelephony.framework/CoreTelephony
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 0x66d1000 -  0x66ddfff +libbz2.1.0.dylib (30) <E1B2BAFE-50A4-3E92-89DE-AEC39AC82CB9> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/usr/lib/libbz2.1.0.dylib
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 0x9799000 -  0x97e3ff3 +libCGFreetype.A.dylib (400.17) <4B3FFCD7-DFB7-3542-A6D4-6A4047B94D58> /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.0.sdk/System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib
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0x8fec9000 - 0x8fefbe57  dyld (210.2.3) <23516BE4-29BE-350C-91C9-F36E7999F0F1> /usr/lib/dyld
0x90b6b000 - 0x90b6cfff  libdnsinfo.dylib (453.18) <41C7B8E2-2A81-31DE-BD8B-F0C29E169D4F> /usr/lib/system/libdnsinfo.dylib
0x92999000 - 0x929a3fff  libsystem_notify.dylib (98.5) <7EEE9475-18F8-3099-B0ED-23A3E528ABE0> /usr/lib/system/libsystem_notify.dylib
0x9312f000 - 0x93136fff  libsystem_dnssd.dylib (379.32.1) <6A505284-2382-3F27-B96F-15FFDACF004E> /usr/lib/system/libsystem_dnssd.dylib
0x9333e000 - 0x9338afff  libcorecrypto.dylib (106.2) <20EBADBA-D6D6-36F0-AE80-168E9AF13DB6> /usr/lib/system/libcorecrypto.dylib
0x93498000 - 0x9349bff7  libcompiler_rt.dylib (30) <CE5DBDB4-0124-3E2B-9105-989DF98DD108> /usr/lib/system/libcompiler_rt.dylib
0x935be000 - 0x935c0fff  libdyld.dylib (210.2.3) <05D6FF2A-F09B-309D-95F7-7AF10259C707> /usr/lib/system/libdyld.dylib
0x935f7000 - 0x93624ffe  libsystem_m.dylib (3022.6) <9975D9C3-3B71-38E3-AA21-C5C5F9D9C431> /usr/lib/system/libsystem_m.dylib
0x93625000 - 0x936e2feb  libsystem_c.dylib (825.25) <B1F6916A-F558-38B5-A18C-D9733625FDC9> /usr/lib/system/libsystem_c.dylib
0x938eb000 - 0x938ecfff  libsystem_sandbox.dylib (220) <4E42390B-25EC-3530-AF01-337E430C16EB> /usr/lib/system/libsystem_sandbox.dylib
0x93fc4000 - 0x93fe1ff7  libresolv.9.dylib (51) <B9742A2A-DF15-3F6E-8FCE-778A58214B3A> /usr/lib/libresolv.9.dylib
0x93fe6000 - 0x94012ff7  libsystem_info.dylib (406.17) <AA5611DB-A944-3072-B6BE-ACAB08689547> /usr/lib/system/libsystem_info.dylib
0x94507000 - 0x94515ff3  libsystem_network.dylib (77.10) <7FBF5A15-97BA-3721-943E-E77F0C40DBE1> /usr/lib/system/libsystem_network.dylib
0x958e1000 - 0x958ecfff  libcommonCrypto.dylib (60026) <A6C6EDB8-7E69-3827-81F3-9A74D0935461> /usr/lib/system/libcommonCrypto.dylib
0x95b46000 - 0x95b4aff7  libmacho.dylib (829) <5280A013-4F74-3F74-BE0C-7F612C49F1DC> /usr/lib/system/libmacho.dylib
0x96cfc000 - 0x96cfcfff  libkeymgr.dylib (25) <D5E93F7F-9315-3AD6-92C7-941F7B54C490> /usr/lib/system/libkeymgr.dylib
0x9724a000 - 0x9724effe  libcache.dylib (57) <834FDCA7-FE3B-33CC-A12A-E11E202477EC> /usr/lib/system/libcache.dylib
0x972a7000 - 0x972a8fff  libremovefile.dylib (23.1) <98622D14-DAAB-3AD8-A5D9-C322BF572A98> /usr/lib/system/libremovefile.dylib
0x972f8000 - 0x972f9ffd  libunc.dylib (25) <58599CBF-E262-3CEA-AFE1-35560E0177DC> /usr/lib/system/libunc.dylib
0x97408000 - 0x97422ffc  libsystem_kernel.dylib (2050.18.24) <C17D49D0-7961-3B67-B443-C788C6E5AA76> /usr/lib/system/libsystem_kernel.dylib
0x98584000 - 0x98584fff  libSystem.B.dylib (169.3) <4F99C03B-BBFF-3BF8-8CC2-2DA764447446> /usr/lib/libSystem.B.dylib
0x98701000 - 0x98708fff  liblaunch.dylib (442.26.2) <310C99F8-0811-314D-9BB9-D0ED6DFA024B> /usr/lib/system/liblaunch.dylib
0x991af000 - 0x991bbffe  libkxld.dylib (2050.18.24) <48A75AF6-9D5A-3552-948E-30A1682D3664> /usr/lib/system/libkxld.dylib
0x99217000 - 0x99218fff  libquarantine.dylib (52) <D526310F-DC77-37EA-8F5F-83928EFA3262> /usr/lib/system/libquarantine.dylib
0x99219000 - 0x99219fff  libsystem_blocks.dylib (59) <3A743C5D-CFA5-37D8-80A8-B6795A9DB04F> /usr/lib/system/libsystem_blocks.dylib
0x9a08a000 - 0x9a091ffb  libunwind.dylib (35.1) <E1E8D8B3-3C78-3AB1-B398-C180DC6DCF05> /usr/lib/system/libunwind.dylib
0x9a41e000 - 0x9a486ff7  com.apple.framework.IOKit (2.0 - 755.18.10) <9A80E97E-544F-3A45-916D-6DB7ED217E33> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
0x9a528000 - 0x9a530fff  libcopyfile.dylib (89) <4963541B-0254-371B-B29A-B6806888949B> /usr/lib/system/libcopyfile.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: 117987
    thread_create: 1
    thread_set_state: 19984

VM Region Summary:
ReadOnly portion of Libraries: Total=141.5M resident=112.5M(80%) swapped_out_or_unallocated=29.0M(20%)
Writable regions: Total=99.0M written=2688K(3%) resident=6552K(6%) swapped_out=0K(0%) unallocated=92.6M(94%)

REGION TYPE                      VIRTUAL
===========                      =======
(null) (reserved)                    12K        reserved VM address space (unallocated)
CG image                             16K
CG raster data                        8K
JS JIT generated code              32.0M
MALLOC                             52.8M
MALLOC guard page                    48K
Memory tag=35                      11.6M
Stack                              66.4M
VM_ALLOCATE                          96K
__DATA                             7260K
__LINKEDIT                         53.9M
__OBJC                                4K
__PAGEZERO                            4K
__TEXT                             87.6M
__UNICODE                           544K
mapped file                       245.2M
shared memory                        12K
===========                      =======
TOTAL                             557.2M
TOTAL, minus reserved VM space    557.2M

[felixyz]

@cthree (and others who might run into this problem)
Dispatch::Queue.main returns an instance of Dispatch::Queue, which is a RubyMotion-specific class. You have to get a pointer to the actual queue (of type dispatch_object_t) by calling dispatch_object on the queue, like this:

@socket = GCDAsyncUdpSocket.alloc.initWithDelegate(self, delegateQueue:Dispatch::Queue.main.dispatch_object)

Thus, this issue should be closed. @robbiehanson

[dvor]

Thanks @felixyz!