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Apache2 crash with mod_wsgi and python #284

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Zitrax opened this issue Mar 25, 2018 · 3 comments
Closed

Apache2 crash with mod_wsgi and python #284

Zitrax opened this issue Mar 25, 2018 · 3 comments

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@Zitrax
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Zitrax commented Mar 25, 2018

I am trying to setup a webserver in docker but currently the apache process segfaults.

I am on ubuntu 16.04 with apache 2.4.18 and mod_wsgi 4.3.0.

Backtrace:

#0  0x00007ff0263cb944 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#1  0x00007ff026454046 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#2  0x00007ff0263d0167 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#3  0x00007ff0263d0dfb in _PyObject_GC_Malloc () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#4  0x00007ff0263d0ead in _PyObject_GC_New () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#5  0x00007ff026456b2c in PyDict_New () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#6  0x00007ff026459510 in PyDict_Copy () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#7  0x00007ff0263c7767 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#8  0x00007ff0263bf173 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#9  0x00007ff026408273 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#10 0x00007ff02640902f in _PyObject_CallFunction_SizeT () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#11 0x00007ff02639aeb9 in init_io () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#12 0x00007ff026443985 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#13 0x00007ff026444390 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#14 0x00007ff0264455ea in PyImport_ImportModuleLevel () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#15 0x00007ff0263af8b8 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#16 0x00007ff026408273 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#17 0x00007ff0264de487 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#18 0x00007ff0263a47e6 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#19 0x00007ff0264df05c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#20 0x00007ff0263a0da9 in PyEval_EvalCode () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#21 0x00007ff026442244 in PyImport_ExecCodeModuleEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#22 0x00007ff026442c1f in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#23 0x00007ff026444390 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#24 0x00007ff0264455ea in PyImport_ImportModuleLevel () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#25 0x00007ff0263af8b8 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#26 0x00007ff026408273 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#27 0x00007ff0264de487 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#28 0x00007ff0263a47e6 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#29 0x00007ff0264df05c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#30 0x00007ff0263a0da9 in PyEval_EvalCode () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#31 0x00007ff026442244 in PyImport_ExecCodeModuleEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#32 0x00007ff026442c1f in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#33 0x00007ff026444390 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#34 0x00007ff0264455ea in PyImport_ImportModuleLevel () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#35 0x00007ff0263af8b8 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#36 0x00007ff026408273 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#37 0x00007ff0264de487 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#38 0x00007ff0263a47e6 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#39 0x00007ff0264df05c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#40 0x00007ff0263a0da9 in PyEval_EvalCode () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#41 0x00007ff026442244 in PyImport_ExecCodeModuleEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#42 0x00007ff026442c1f in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#43 0x00007ff026444390 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#44 0x00007ff0264455ea in PyImport_ImportModuleLevel () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#45 0x00007ff0263af8b8 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#46 0x00007ff026408273 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#47 0x00007ff0264de487 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#48 0x00007ff0263a47e6 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#49 0x00007ff0264df05c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#50 0x00007ff0263a0da9 in PyEval_EvalCode () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#51 0x00007ff026442244 in PyImport_ExecCodeModuleEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#52 0x00007ff026442c1f in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#53 0x00007ff026444390 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#54 0x00007ff0264455ea in PyImport_ImportModuleLevel () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#55 0x00007ff0263af8b8 in ?? () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#56 0x00007ff026408273 in PyObject_Call () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#57 0x00007ff0264de487 in PyEval_CallObjectWithKeywords () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#58 0x00007ff0263a47e6 in PyEval_EvalFrameEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#59 0x00007ff0264df05c in PyEval_EvalCodeEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#60 0x00007ff0263a0da9 in PyEval_EvalCode () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#61 0x00007ff026442244 in PyImport_ExecCodeModuleEx () from /usr/lib/x86_64-linux-gnu/libpython2.7.so.1.0
#62 0x00007ff026895f85 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so
#63 0x00007ff026899476 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so
#64 0x00007ff0268a3d34 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so
#65 0x00007ff0268a653b in ?? () from /usr/lib/apache2/modules/mod_wsgi.so
#66 0x00007ff02a3b948e in apr_proc_other_child_alert () from /usr/lib/x86_64-linux-gnu/libapr-1.so.0
#67 0x00007ff0272e5e29 in ?? () from /usr/lib/apache2/modules/mod_mpm_event.so
#68 0x00005608a49d646e in ap_run_mpm ()
#69 0x00005608a49cf400 in main ()

Apache modules:

# apache2ctl -M
Loaded Modules:
 core_module (static)
 so_module (static)
 watchdog_module (static)
 http_module (static)
 log_config_module (static)
 logio_module (static)
 version_module (static)
 unixd_module (static)
 access_compat_module (shared)
 alias_module (shared)
 auth_basic_module (shared)
 authn_core_module (shared)
 authn_file_module (shared)
 authz_core_module (shared)
 authz_host_module (shared)
 authz_user_module (shared)
 autoindex_module (shared)
 deflate_module (shared)
 dir_module (shared)
 env_module (shared)
 expires_module (shared)
 filter_module (shared)
 mime_module (shared)
 mpm_event_module (shared)
 negotiation_module (shared)
 rewrite_module (shared)
 setenvif_module (shared)
 status_module (shared)
 wsgi_module (shared)

The site have these wsgi related settings:

WSGIApplicationGroup %{GLOBAL}
WSGIProcessGroup tapp-main
WSGIDaemonProcess tapp-main processes=2 \
                                      threads=25 \
                                      home=/usr/share/tapp \
                                      python-path=/etc/tapp/main:/usr/share/tapp \
                                      user=tapp \
                                      group=tapp
WSGIImportScript /usr/share/tapp/wsgistartup.py \
                         process-group=tapp-main \
                         application-group=%{GLOBAL}
WSGIScriptAlias / /usr/share/tapp/wsgi.py
WSGIPassAuthorization On

I am not sure how to further debug this, any clues?
@GrahamDumpleton
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Version 4.3.0 is quite old and there have been 50+ releases since then. Use the latest version. There is no point trying to debug an older version.

@Zitrax
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Zitrax commented Mar 25, 2018

Yes upgrading did work, I updated whole ubuntu though so unclear if it was mod_wsgi by itself or some other involved component.

Anyway the update was from Ubuntu 16.04 to 17.10 which changed mod_wsgi from 4.3.0 to 4.5.17 and apache from 2.4.18 to 2.4.27.

@Zitrax Zitrax closed this as completed Mar 25, 2018
@GrahamDumpleton
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So you are only 10 versions behind now. :-)

Using operating system packages for mod_wsgi from Ubuntu is usually not the best idea. At least they aren't the five years out of date as they were a few years ago. Especially when using Docker where it is much easier to install, you are better off ignoring system package for mod_wsgi and use mod_wsgi-express instead.

See:

When using mod_wsgi-express the Apache configuration is done for you, with various best practices that you likely aren't following, being applied automatically. A large part of the reason for mod_wsgi-express is to make it easier to deploy WSGI application inside of Docker.

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