New GitHub issue #100981 from galaxy4public:<br>
<hr>
<pre>
# Crash report
When running the testsuite one test is intermittently failing with a segmentation fault. The test in question is test=test__xxsubinterpreters and the crash seems to be GIL related. I am able to consistently reproduce the crash on my environment where I am building Python inside a chroot (/proc, /sys, and /dev are "mount --bind"ed from the host system).
On a freshly built with GCC 12.2.0 Python 3.11 with the following configure options:
```
CFLAGS='-pipe -O2 -ggdb -fomit-frame-pointer'
export CFLAGS
CXXFLAGS='-pipe -ggdb -O0'
export CXXFLAGS
FFLAGS='-pipe -ggdb -O0 '
export FFLAGS
FCFLAGS='-pipe -ggdb -O0 '
export FCFLAGS
LDFLAGS=
export LDFLAGS
/home/galaxy/rpm-work/BUILD/Python-3.11.1/configure \
--enable-ipv6 \
--with-computed-gotos \
--with-dbmliborder=gdbm:ndbm:bdb \
--with-system-expat \
--without-system-ffi \
--without-system-libmpdec \
--enable-loadable-sqlite-extensions \
--without-dtrace \
--with-lto \
--without-ensurepip \
--with-pkg-config=yes \
--without-static-libpython \
--with-tzpath=/usr/share/zoneinfo \
--with-openssl-rpath=no \
--with-ssl-default-suites=openssl \
--disable-optimizations \
--with-pydebug
```
This is the testsuite output with just the test in question:
```
galaxy@apollo:~/rpm-work/BUILD/Python-3.11.1 $ LD_LIBRARY_PATH=/home/galaxy/rpm-work/BUILD/Python-3.11.1/build/debug build/debug/python -m test -j4 --slowest --timeout=1800 -W -F test__xxsubinterpreters
0:00:00 load avg: 0.05 Run tests in parallel using 4 child processes (timeout: 30 min, worker timeout: 35 min)
0:00:08 load avg: 0.65 [ 1/1] test__xxsubinterpreters crashed (Exit code -11)
Fatal Python error: Segmentation fault
Thread 0x00007effcf9a2468 (most recent call first):
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/test__xxsubinterpreters.py", line 283 in clean_up_interpreters
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/test__xxsubinterpreters.py", line 299 in tearDown
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/case.py", line 584 in _callTearDown
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/case.py", line 626 in run
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/case.py", line 678 in __call__
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/suite.py", line 122 in run
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/suite.py", line 84 in __call__
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/suite.py", line 122 in run
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/suite.py", line 84 in __call__
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/suite.py", line 122 in run
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/suite.py", line 84 in __call__
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/unittest/runner.py", line 217 in run
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/support/__init__.py", line 1095 in _run_suite
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/support/__init__.py", line 1221 in run_unittest
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/runtest.py", line 276 in _test_module
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/runtest.py", line 312 in _runtest_inner2
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/runtest.py", line 355 in _runtest_inner
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/runtest.py", line 214 in _runtest
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/runtest.py", line 260 in runtest
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/runtest_mp.py", line 90 in run_tests_worker
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/main.py", line 722 in _main
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/main.py", line 701 in main
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/libregrtest/main.py", line 763 in main
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/regrtest.py", line 43 in _main
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/test/regrtest.py", line 47 in <module>
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/runpy.py", line 88 in _run_code
File "/home/galaxy/rpm-work/BUILD/Python-3.11.1/Lib/runpy.py", line 198 in _run_module_as_main
Extension modules: _testcapi, _xxsubinterpreters (total: 2)
Kill <TestWorkerProcess #2 running test=test__xxsubinterpreters pid=1282561 time=8.8 sec> process group
Kill <TestWorkerProcess #3 running test=test__xxsubinterpreters pid=1282560 time=8.8 sec> process group
Kill <TestWorkerProcess #4 running test=test__xxsubinterpreters pid=1282564 time=8.8 sec> process group
== Tests result: FAILURE ==
10 slowest tests:
1 test failed:
test__xxsubinterpreters
Total duration: 9.0 sec
Tests result: FAILURE
galaxy@apollo:~/rpm-work/BUILD/Python-3.11.1 $
```
# Error messages
I acquired a core dump and under gdb it looks as follows:
```
Reading symbols from python...
[New LWP 1282606]
[New LWP 1282563]
[New LWP 1282568]
Core was generated by `/home/galaxy/rpm-work/BUILD/Python-3.11.1/build/debug/python -u -m test.regrtes'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007effcf93b6a5 in __syscall4 (n=14, a1=2, a2=139637136696304, a3=0, a4=8)
at ./arch/x86_64/syscall_arch.h:38
38 __asm__ __volatile__ ("syscall" : "=a"(ret) : "a"(n), "D"(a1), "S"(a2),
[Current thread is 1 (LWP 1282606)]
(gdb) info threads
Id Target Id Frame
* 1 LWP 1282606 0x00007effcf93b6a5 in __syscall4 (n=14, a1=2, a2=139637136696304, a3=0, a4=8)
at ./arch/x86_64/syscall_arch.h:38
2 LWP 1282563 0x00007effcf545221 in validate_list (head=0x7effce211d10,
flags=collecting_clear_unreachable_clear)
at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Modules/gcmodule.c:397
3 LWP 1282568 __cp_end () at src/thread/x86_64/syscall_cp.s:29
(gdb) bt
#0 0x00007effcf93b6a5 in __syscall4 (n=14, a1=2, a2=139637136696304, a3=0, a4=8)
at ./arch/x86_64/syscall_arch.h:38
#1 0x00007effcf93b74c in __restore_sigs (set=0x7effcdee23f0) at src/signal/block.c:43
#2 0x00007effcf93ba59 in raise (sig=11) at src/signal/raise.c:11
#3 0x00007effcf54a6fd in faulthandler_fatal_error (signum=11)
at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Modules/faulthandler.c:385
#4 <signal handler called>
#5 0x00007effcf47e945 in drop_gil (ceval=0x7effcf855060 <_PyRuntime+352>, ceval2=0x7effce07a1c0,
tstate=0x7effce3ddaa0) at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Python/ceval_gil.h:169
#6 0x00007effcf47f3a3 in _PyEval_ReleaseLock (tstate=0x7effce3ddaa0)
at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Python/ceval.c:448
#7 0x00007effcf50d4ef in _PyThreadState_DeleteCurrent (tstate=0x7effce3ddaa0)
at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Python/pystate.c:1126
#8 0x00007effcf5c95df in thread_run (boot_raw=0x7effcdf8e750)
at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Modules/_threadmodule.c:1098
#9 0x00007effcf52cee7 in pythread_wrapper (arg=0x7effce3dd380)
at /home/galaxy/rpm-work/BUILD/Python-3.11.1/Python/thread_pthread.h:241
#10 0x00007effcf957277 in start (p=0x7effcdee2b00) at src/thread/pthread_create.c:207
#11 0x00007effcf95bffe in __clone () at src/thread/x86_64/clone.s:22
Backtrace stopped: frame did not save the PC
(gdb)
```
# Your environment
- CPython versions tested on: 3.11.1 (3.10 works and I cannot trigger the crash doing the exactly same steps)
- Operating system and architecture: ALT Linux (kernel 5.15.50, glibc 2.35.0.6) -> chroot with musl 1.2.3
</pre>
<hr>
<a href="https://github.com/python/cpython/issues/100981">View on GitHub</a>
<p>Labels: type-crash</p>
<p>Assignee: </p>