[issue33196] SEGV in mp.synchronize.Lock.__repr__ in spawn'ed proc if ctx mismatched
Gus Goulart
report at bugs.python.org
Wed Nov 14 08:53:16 EST 2018
Gus Goulart <augusto at goulart.me> added the comment:
@vstinner, on Debian 9 I can see the problem as well but wasn't able to debug with the level of details you did. Could you please share the process you followed?
What I found was:
./python -X dev test_lock_sigsegv.py
Parent r_q: <Lock(owner=None)>, <Lock(owner=None)>, <BoundedSemaphore(value=2147483647, maxvalue=2147483647)>
Fatal Python error: Segmentation fault
Current thread 0x00007fab36124480 (most recent call first):
File "/home/gus/Workspace/cpython/Lib/multiprocessing/synchronize.py", line 170 in __repr__
File "/home/gus/Workspace/cpython/test_lock_sigsegv.py", line 17 in child
File "/home/gus/Workspace/cpython/Lib/multiprocessing/process.py", line 99 in run
File "/home/gus/Workspace/cpython/Lib/multiprocessing/process.py", line 297 in _bootstrap
File "/home/gus/Workspace/cpython/Lib/multiprocessing/spawn.py", line 130 in _main
File "/home/gus/Workspace/cpython/Lib/multiprocessing/spawn.py", line 117 in spawn_main
File "<string>", line 1 in <module>
-11
Using GDB:
(gdb) set follow-fork-mode child
(gdb) run test_lock_sigsegv.py
Starting program: /home/gus/Workspace/cpython/python test_lock_sigsegv.py
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Parent r_q: <Lock(owner=None)>, <Lock(owner=None)>, <BoundedSemaphore(value=2147483647, maxvalue=2147483647)>
[New process 4941]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
process 4941 is executing new program: /home/gus/Workspace/cpython/python
-11
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Inferior 2 (process 4941) exited normally]
(gdb) where
No stack.
(gdb) py-bt
Unable to locate python frame
(gdb)
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<https://bugs.python.org/issue33196>
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