Created
January 17, 2018 02:59
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test_embed failure
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| jeethu@Odin:~/Projects/cpython/cpython$ /home/jeethu/Projects/cpython/cpython/Programs/_testembed repeated_init_and_subinterpreters | |
| --- Pass 0 --- | |
| interp 0 <0x55BF49FDF6A0>, thread state <0x55BF49FE00E0>: id(modules) = 139935889775752 | |
| interp 1 <0x55BF4A05A250>, thread state <0x55BF4A005B10>: id(modules) = 139935888903424 | |
| interp 2 <0x55BF4A05A250>, thread state <0x55BF4A005B10>: id(modules) = 139935870878984 | |
| interp 3 <0x55BF4A073B50>, thread state <0x55BF4A005B10>: id(modules) = 139935870878624 | |
| interp 0 <0x55BF49FDF6A0>, thread state <0x55BF49FE00E0>: id(modules) = 139935889775752 | |
| --- Pass 1 --- | |
| interp 0 <0x55BF49FDF6A0>, thread state <0x55BF49FE00E0>: id(modules) = 139935889879128 | |
| interp 1 <0x55BF4A0C6FC0>, thread state <0x55BF4A005B10>: id(modules) = 139935871127024 | |
| Segmentation fault (core dumped) | |
| jeethu@Odin:~/Projects/cpython/cpython$ gdb /home/jeethu/Projects/cpython/cpython/Programs/_testembed /tmp/cores/core._testembed.7757.Odin.1516157667 | |
| GNU gdb (Ubuntu 8.0.1-0ubuntu1) 8.0.1 | |
| Copyright (C) 2017 Free Software Foundation, Inc. | |
| License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> | |
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| Reading symbols from /home/jeethu/Projects/cpython/cpython/Programs/_testembed...done. | |
| [New LWP 7757] | |
| [Thread debugging using libthread_db enabled] | |
| Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". | |
| Core was generated by `/home/jeethu/Projects/cpython/cpython/Programs/_testembed repeated_init_and_sub'. | |
| Program terminated with signal SIGSEGV, Segmentation fault. | |
| #0 0x000055bf492323bc in code_dealloc (co=co@entry=0x7f455cffef18) at Objects/codeobject.c:431 | |
| 431 free_extra(co_extra->ce_extras[i]); | |
| (gdb) backtrace | |
| #0 0x000055bf492323bc in code_dealloc (co=co@entry=0x7f455cffef18) at Objects/codeobject.c:431 | |
| #1 0x000055bf49275d20 in _Py_Dealloc (op=0x7f455cffef18) at Objects/object.c:1904 | |
| #2 0x000055bf4924bd9b in func_dealloc (op=op@entry=0x7f455cf9d618) at Objects/funcobject.c:532 | |
| #3 0x000055bf49275d20 in _Py_Dealloc (op=0x7f455cf9d618) at Objects/object.c:1904 | |
| #4 0x000055bf4925f54b in free_keys_object (keys=keys@entry=0x7f455cfd1bc8) at Objects/dictobject.c:559 | |
| #5 0x000055bf49265e23 in PyDict_Clear (op=0x7f455cf96d78) at Objects/dictobject.c:1555 | |
| #6 0x000055bf4928e663 in type_clear (type=0x55bf4a007ee8) at Objects/typeobject.c:3532 | |
| #7 0x000055bf491a67a9 in delete_garbage (collectable=collectable@entry=0x7fff83729ad0, old=old@entry=0x55bf4964b690 <_PyRuntime+400>) at Modules/gcmodule.c:763 | |
| #8 0x000055bf491a72b3 in collect (generation=generation@entry=2, n_collected=n_collected@entry=0x0, n_uncollectable=n_uncollectable@entry=0x0, nofail=nofail@entry=1) at Modules/gcmodule.c:917 | |
| #9 0x000055bf491a7dd7 in _PyGC_CollectNoFail () at Modules/gcmodule.c:1600 | |
| #10 0x000055bf49178566 in PyImport_Cleanup () at Python/import.c:513 | |
| #11 0x000055bf491859f7 in Py_EndInterpreter (tstate=0x55bf4a005b10) at Python/pylifecycle.c:1436 | |
| #12 0x000055bf4915f6eb in test_repeated_init_and_subinterpreters () at ./Programs/_testembed.c:63 | |
| #13 0x000055bf4915f944 in main (argc=<optimized out>, argv=0x7fff83729d18) at ./Programs/_testembed.c:229 | |
| (gdb) p i | |
| $1 = 0 | |
| (gdb) p free_extra | |
| $2 = (freefunc) 0xcbcbcbcbcbcbcbcb | |
| (gdb) |
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My working theory:
co_extra_freefuncsis a field in thePyInterpreterStatestruct. If the underlyingPyThreadStatechanges (i.e code objects traverse thread boundaries) and the code object ends up being freed, this results in a crash. https://bugs.python.org/issue30604 might be related to this issue.Repro
Programs/_testembed repeated_init_and_subinterpreters