More specifically, if you look at the stack trace you see: #6 0x00007f68aefe6292 in PyEval_RestoreThread () from target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 #7 0x00007f68af02f1dc in PyGILState_Ensure () from target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 #8 0x00007f68ac30d6e3 in ?? () from target:/usr/lib/python3.10/lib-dynload/_sqlite3.cpython-310-x86_64-linux-gnu.so #9 0x00007f68a750b01a in sqlite3LeaveMutexAndCloseZombie () from target:/lib/x86_64-linux-gnu/libsqlite3.so.0
Note how that function ends up calling PyGILState_Ensure(). That is a big no no when working with Python sub interpreters. In other words, it uses the simplified GIL state API for some callback into Python from C code of SQLite and using that when in a sub interpreter can cause deadlocks. https://modwsgi.readthedocs.io/en/master/user-guides/application-issues.html#python-simplified-gil-state-api So need to find the code for that function in sqlite module and work out what it does. Graham > On 9 Feb 2023, at 7:09 am, Graham Dumpleton <graham.dumple...@gmail.com> > wrote: > > The key bit of information in that is the call to > sqlite3LeaveMutexAndCloseZombie(). It looks like sqlite module for Python is > doing something really strange that isn't working with sub interpreters. This > will need some research as it may be a bug they have introduced in Python > 3.10 for the sqlite module. > > Graham > >> On 9 Feb 2023, at 7:02 am, Carsten Fuchs <carsten.fu...@cafu.de> wrote: >> >> Ok, I got a stack trace. My understanding of this is limited, but the thread >> seems to be stuck at polling something without timeout? (gdb reports that >> file ../sysdeps/unix/sysv/linux/poll.c cannot be found) >> >> The full session follows. (Using plaintext email today in the hope that this >> helps with readibility. Please let me know if I should send differently >> instead.) >> Between the two "thread apply all bt" commands I waited about two minutes: >> >> >> $ sudo gdb /usr/sbin/apache2 60501 >> GNU gdb (Ubuntu 12.1-0ubuntu1~22.04) 12.1 >> Copyright (C) 2022 Free Software Foundation, Inc. >> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> >> This is free software: you are free to change and redistribute it. >> There is NO WARRANTY, to the extent permitted by law. >> Type "show copying" and "show warranty" for details. >> This GDB was configured as "x86_64-linux-gnu". >> Type "show configuration" for configuration details. >> For bug reporting instructions, please see: >> <https://www.gnu.org/software/gdb/bugs/>. >> Find the GDB manual and other documentation resources online at: >> <http://www.gnu.org/software/gdb/documentation/>. >> >> For help, type "help". >> Type "apropos word" to search for commands related to "word"... >> Reading symbols from /usr/sbin/apache2... >> (No debugging symbols found in /usr/sbin/apache2) >> Attaching to program: /usr/sbin/apache2, process 60501 >> [New LWP 60532] >> [New LWP 60533] >> [New LWP 60534] >> [Thread debugging using libthread_db enabled] >> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". >> 0x00007f68af72bd7f in __GI___poll (fds=0x7ffe9f0b9e90, nfds=1, timeout=-1) >> at ../sysdeps/unix/sysv/linux/poll.c:29 >> 29 ../sysdeps/unix/sysv/linux/poll.c: Datei oder Verzeichnis nicht >> gefunden. >> (gdb) thread apply all bt >> >> Thread 4 (Thread 0x7f68ad6f9640 (LWP 60534) "apache2"): >> #0 __futex_abstimed_wait_common64 (private=-1359973880, cancel=true, >> abstime=0x7f68ad6f7220, op=137, expected=0, futex_word=0x7f68af3b49a8 >> <_PyRuntime+424>) at ./nptl/futex-internal.c:57 >> #1 __futex_abstimed_wait_common (cancel=true, private=-1359973880, >> abstime=0x7f68ad6f7220, clockid=-1359689157, expected=0, >> futex_word=0x7f68af3b49a8 <_PyRuntime+424>) at ./nptl/futex-internal.c:87 >> #2 __GI___futex_abstimed_wait_cancelable64 >> (futex_word=futex_word@entry=0x7f68af3b49a8 <_PyRuntime+424>, >> expected=expected@entry=0, clockid=clockid@entry=1, >> abstime=abstime@entry=0x7f68ad6f7220, private=private@entry=0) at >> ./nptl/futex-internal.c:139 >> #3 0x00007f68af6a6f1b in __pthread_cond_wait_common >> (abstime=0x7f68ad6f7220, clockid=1, mutex=0x7f68af3b49b0 <_PyRuntime+432>, >> cond=0x7f68af3b4980 <_PyRuntime+384>) at ./nptl/pthread_cond_wait.c:503 >> #4 ___pthread_cond_timedwait64 (cond=0x7f68af3b4980 <_PyRuntime+384>, >> mutex=0x7f68af3b49b0 <_PyRuntime+432>, abstime=0x7f68ad6f7220) at >> ./nptl/pthread_cond_wait.c:652 >> #5 0x00007f68aefe5df5 in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #6 0x00007f68aefe6292 in PyEval_RestoreThread () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #7 0x00007f68af02f1dc in PyGILState_Ensure () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #8 0x00007f68ac30d6e3 in ?? () from >> target:/usr/lib/python3.10/lib-dynload/_sqlite3.cpython-310-x86_64-linux-gnu.so >> #9 0x00007f68a750b01a in sqlite3LeaveMutexAndCloseZombie () from >> target:/lib/x86_64-linux-gnu/libsqlite3.so.0 >> #10 0x00007f68a750b2d6 in ?? () from >> target:/lib/x86_64-linux-gnu/libsqlite3.so.0 >> #11 0x00007f68ac3087d6 in ?? () from >> target:/usr/lib/python3.10/lib-dynload/_sqlite3.cpython-310-x86_64-linux-gnu.so >> #12 0x00007f68aef118ba in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #13 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #14 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #15 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #16 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #17 0x00007f68aee97766 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #18 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #19 0x00007f68aee9c9b8 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #20 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #21 0x00007f68aee97766 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #22 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #23 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #24 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #25 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #26 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #27 0x00007f68aef08118 in PyVectorcall_Call () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #28 0x00007f68aee97766 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #29 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #30 0x00007f68aee9962e in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #31 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #32 0x00007f68aef08618 in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #33 0x00007f68aee99458 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #34 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #35 0x00007f68aef086ac in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #36 0x00007f68af41680f in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #37 0x00007f68af41c9c8 in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #38 0x00007f68af6a7b43 in start_thread (arg=<optimized out>) at >> ./nptl/pthread_create.c:442 >> #39 0x00007f68af739a00 in clone3 () at >> ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 >> >> Thread 3 (Thread 0x7f68adefa640 (LWP 60533) "apache2"): >> #0 __futex_abstimed_wait_common64 (private=0, cancel=true, >> abstime=0x7f68adef9d80, op=137, expected=0, futex_word=0x7f68af3b49a8 >> <_PyRuntime+424>) at ./nptl/futex-internal.c:57 >> #1 __futex_abstimed_wait_common (cancel=true, private=0, >> abstime=0x7f68adef9d80, clockid=0, expected=0, futex_word=0x7f68af3b49a8 >> <_PyRuntime+424>) at ./nptl/futex-internal.c:87 >> #2 __GI___futex_abstimed_wait_cancelable64 >> (futex_word=futex_word@entry=0x7f68af3b49a8 <_PyRuntime+424>, >> expected=expected@entry=0, clockid=clockid@entry=1, >> abstime=abstime@entry=0x7f68adef9d80, private=private@entry=0) at >> ./nptl/futex-internal.c:139 >> #3 0x00007f68af6a6f1b in __pthread_cond_wait_common >> (abstime=0x7f68adef9d80, clockid=1, mutex=0x7f68af3b49b0 <_PyRuntime+432>, >> cond=0x7f68af3b4980 <_PyRuntime+384>) at ./nptl/pthread_cond_wait.c:503 >> #4 ___pthread_cond_timedwait64 (cond=0x7f68af3b4980 <_PyRuntime+384>, >> mutex=0x7f68af3b49b0 <_PyRuntime+432>, abstime=0x7f68adef9d80) at >> ./nptl/pthread_cond_wait.c:652 >> #5 0x00007f68aefe5df5 in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #6 0x00007f68aefe6292 in PyEval_RestoreThread () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #7 0x00007f68af02f1dc in PyGILState_Ensure () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #8 0x00007f68af41cf30 in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #9 0x00007f68af6a7b43 in start_thread (arg=<optimized out>) at >> ./nptl/pthread_create.c:442 >> #10 0x00007f68af739a00 in clone3 () at >> ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 >> >> Thread 2 (Thread 0x7f68ae6fb640 (LWP 60532) "apache2"): >> #0 0x00007f68af72e7ed in __GI___select (nfds=0, readfds=0x0, writefds=0x0, >> exceptfds=0x0, timeout=0x7f68ae6fad60) at >> ../sysdeps/unix/sysv/linux/select.c:69 >> #1 0x00007f68af865c09 in apr_sleep () from >> target:/lib/x86_64-linux-gnu/libapr-1.so.0 >> --Type <RET> for more, q to quit, c to continue without paging-- >> #2 0x00007f68af41d11c in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #3 0x00007f68af6a7b43 in start_thread (arg=<optimized out>) at >> ./nptl/pthread_create.c:442 >> #4 0x00007f68af739a00 in clone3 () at >> ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 >> >> Thread 1 (Thread 0x7f68af59a780 (LWP 60501) "apache2"): >> #0 0x00007f68af72bd7f in __GI___poll (fds=0x7ffe9f0b9e90, nfds=1, >> timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 >> #1 0x00007f68af85e0fb in apr_poll () from >> target:/lib/x86_64-linux-gnu/libapr-1.so.0 >> #2 0x00007f68af4222d8 in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #3 0x00007f68af423f1f in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #4 0x000055c9771cc73d in ap_run_pre_mpm () >> #5 0x00007f68af478455 in ?? () from >> target:/usr/lib/apache2/modules/mod_mpm_event.so >> #6 0x000055c9771c30e8 in ap_run_mpm () >> #7 0x000055c9771c2609 in main () >> (gdb) >> (gdb) >> (gdb) >> (gdb) >> (gdb) thread apply all bt >> >> Thread 4 (Thread 0x7f68ad6f9640 (LWP 60534) "apache2"): >> #0 __futex_abstimed_wait_common64 (private=-1359973880, cancel=true, >> abstime=0x7f68ad6f7220, op=137, expected=0, futex_word=0x7f68af3b49a8 >> <_PyRuntime+424>) at ./nptl/futex-internal.c:57 >> #1 __futex_abstimed_wait_common (cancel=true, private=-1359973880, >> abstime=0x7f68ad6f7220, clockid=-1359689157, expected=0, >> futex_word=0x7f68af3b49a8 <_PyRuntime+424>) at ./nptl/futex-internal.c:87 >> #2 __GI___futex_abstimed_wait_cancelable64 >> (futex_word=futex_word@entry=0x7f68af3b49a8 <_PyRuntime+424>, >> expected=expected@entry=0, clockid=clockid@entry=1, >> abstime=abstime@entry=0x7f68ad6f7220, private=private@entry=0) at >> ./nptl/futex-internal.c:139 >> #3 0x00007f68af6a6f1b in __pthread_cond_wait_common >> (abstime=0x7f68ad6f7220, clockid=1, mutex=0x7f68af3b49b0 <_PyRuntime+432>, >> cond=0x7f68af3b4980 <_PyRuntime+384>) at ./nptl/pthread_cond_wait.c:503 >> #4 ___pthread_cond_timedwait64 (cond=0x7f68af3b4980 <_PyRuntime+384>, >> mutex=0x7f68af3b49b0 <_PyRuntime+432>, abstime=0x7f68ad6f7220) at >> ./nptl/pthread_cond_wait.c:652 >> #5 0x00007f68aefe5df5 in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #6 0x00007f68aefe6292 in PyEval_RestoreThread () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #7 0x00007f68af02f1dc in PyGILState_Ensure () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #8 0x00007f68ac30d6e3 in ?? () from >> target:/usr/lib/python3.10/lib-dynload/_sqlite3.cpython-310-x86_64-linux-gnu.so >> #9 0x00007f68a750b01a in sqlite3LeaveMutexAndCloseZombie () from >> target:/lib/x86_64-linux-gnu/libsqlite3.so.0 >> #10 0x00007f68a750b2d6 in ?? () from >> target:/lib/x86_64-linux-gnu/libsqlite3.so.0 >> #11 0x00007f68ac3087d6 in ?? () from >> target:/usr/lib/python3.10/lib-dynload/_sqlite3.cpython-310-x86_64-linux-gnu.so >> #12 0x00007f68aef118ba in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #13 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #14 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #15 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #16 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #17 0x00007f68aee97766 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #18 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #19 0x00007f68aee9c9b8 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #20 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #21 0x00007f68aee97766 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #22 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #23 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #24 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #25 0x00007f68aee9aeee in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #26 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #27 0x00007f68aef08118 in PyVectorcall_Call () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #28 0x00007f68aee97766 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #29 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #30 0x00007f68aee9962e in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #31 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #32 0x00007f68aef08618 in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #33 0x00007f68aee99458 in _PyEval_EvalFrameDefault () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #34 0x00007f68aefe781f in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #35 0x00007f68aef086ac in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #36 0x00007f68af41680f in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #37 0x00007f68af41c9c8 in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #38 0x00007f68af6a7b43 in start_thread (arg=<optimized out>) at >> ./nptl/pthread_create.c:442 >> #39 0x00007f68af739a00 in clone3 () at >> ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 >> >> Thread 3 (Thread 0x7f68adefa640 (LWP 60533) "apache2"): >> #0 __futex_abstimed_wait_common64 (private=0, cancel=true, >> abstime=0x7f68adef9d80, op=137, expected=0, futex_word=0x7f68af3b49a8 >> <_PyRuntime+424>) at ./nptl/futex-internal.c:57 >> #1 __futex_abstimed_wait_common (cancel=true, private=0, >> abstime=0x7f68adef9d80, clockid=0, expected=0, futex_word=0x7f68af3b49a8 >> <_PyRuntime+424>) at ./nptl/futex-internal.c:87 >> #2 __GI___futex_abstimed_wait_cancelable64 >> (futex_word=futex_word@entry=0x7f68af3b49a8 <_PyRuntime+424>, >> expected=expected@entry=0, clockid=clockid@entry=1, >> abstime=abstime@entry=0x7f68adef9d80, private=private@entry=0) at >> ./nptl/futex-internal.c:139 >> #3 0x00007f68af6a6f1b in __pthread_cond_wait_common >> (abstime=0x7f68adef9d80, clockid=1, mutex=0x7f68af3b49b0 <_PyRuntime+432>, >> cond=0x7f68af3b4980 <_PyRuntime+384>) at ./nptl/pthread_cond_wait.c:503 >> #4 ___pthread_cond_timedwait64 (cond=0x7f68af3b4980 <_PyRuntime+384>, >> mutex=0x7f68af3b49b0 <_PyRuntime+432>, abstime=0x7f68adef9d80) at >> ./nptl/pthread_cond_wait.c:652 >> #5 0x00007f68aefe5df5 in ?? () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #6 0x00007f68aefe6292 in PyEval_RestoreThread () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #7 0x00007f68af02f1dc in PyGILState_Ensure () from >> target:/lib/x86_64-linux-gnu/libpython3.10.so.1.0 >> #8 0x00007f68af41cf30 in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #9 0x00007f68af6a7b43 in start_thread (arg=<optimized out>) at >> ./nptl/pthread_create.c:442 >> #10 0x00007f68af739a00 in clone3 () at >> ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 >> >> Thread 2 (Thread 0x7f68ae6fb640 (LWP 60532) "apache2"): >> #0 0x00007f68af72e7ed in __GI___select (nfds=0, readfds=0x0, writefds=0x0, >> exceptfds=0x0, timeout=0x7f68ae6fad60) at >> ../sysdeps/unix/sysv/linux/select.c:69 >> #1 0x00007f68af865c09 in apr_sleep () from >> target:/lib/x86_64-linux-gnu/libapr-1.so.0 >> --Type <RET> for more, q to quit, c to continue without paging-- >> #2 0x00007f68af41d11c in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #3 0x00007f68af6a7b43 in start_thread (arg=<optimized out>) at >> ./nptl/pthread_create.c:442 >> #4 0x00007f68af739a00 in clone3 () at >> ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81 >> >> Thread 1 (Thread 0x7f68af59a780 (LWP 60501) "apache2"): >> #0 0x00007f68af72bd7f in __GI___poll (fds=0x7ffe9f0b9e90, nfds=1, >> timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29 >> #1 0x00007f68af85e0fb in apr_poll () from >> target:/lib/x86_64-linux-gnu/libapr-1.so.0 >> #2 0x00007f68af4222d8 in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #3 0x00007f68af423f1f in ?? () from >> target:/usr/lib/apache2/modules/mod_wsgi.so >> #4 0x000055c9771cc73d in ap_run_pre_mpm () >> #5 0x00007f68af478455 in ?? () from >> target:/usr/lib/apache2/modules/mod_mpm_event.so >> #6 0x000055c9771c30e8 in ap_run_mpm () >> #7 0x000055c9771c2609 in main () >> (gdb) >> >> >> Best regards, >> Carsten >> >> >> Am 07.02.23 um 22:44 schrieb Graham Dumpleton: >>> Only other thing can suggest if you know point at which it is hanging, is >>> to test and extract C stack trace by attaching gdb to the running process. >>> This may or may not work depending on your system setup and what tools are >>> installed. >>> >>> Debugging Techniques — mod_wsgi 4.9.4 documentation >>> <https://modwsgi.readthedocs.io/en/master/user-guides/debugging-techniques.html#debugging-crashes-with-gdb> >>> modwsgi.readthedocs.io >>> <https://modwsgi.readthedocs.io/en/master/user-guides/debugging-techniques.html#debugging-crashes-with-gdb> >>> favicon.ico >>> <https://modwsgi.readthedocs.io/en/master/user-guides/debugging-techniques.html#debugging-crashes-with-gdb> >>> >>> <https://modwsgi.readthedocs.io/en/master/user-guides/debugging-techniques.html#debugging-crashes-with-gdb> >>> >>> >>> That may give some clues. >>> >>> Graham >>> >>>> On 8 Feb 2023, at 8:42 am, Graham Dumpleton <graham.dumple...@gmail.com> >>>> wrote: >>>> >>>> Is any of your code using ctypes module for Apache, or any other module >>>> which is used to call into C code by writing Python code only? >>>> >>>> Graham >>>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "modwsgi" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to modwsgi+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/modwsgi/a09f8380-eddd-e859-911b-5919d44ea610%40cafu.de. > -- You received this message because you are subscribed to the Google Groups "modwsgi" group. 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