Leaks when importing yaml with the address sanitizer #914
Description
I get some leaks when using the address sanitizer and importing yaml. After
$ export LD_PRELOAD=libasan.so
$ python -c "import yaml"I get:
==160520==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 1520 byte(s) in 1 object(s) allocated from:
#0 0x7f1cc4320cb5 in malloc (/usr/lib/libasan.so+0x120cb5) (BuildId: 0b96d08695bbce2da9d4770c29ad2e72fb536f47)
#1 0x7f1cc3b68d83 (/usr/lib/libpython3.14.so.1.0+0x168d83) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#2 0x7f1cc3b6815b (/usr/lib/libpython3.14.so.1.0+0x16815b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#3 0x7b1cbfc63298 in __pyx_pymod_exec__yaml /tmp/pip-install-bu_ce05l/pyyaml_c94b2d04461646e8baf6f170be2973b8/yaml/_yaml.c:24348
#4 0x7f1cc3c818e7 in PyModule_ExecDef (/usr/lib/libpython3.14.so.1.0+0x2818e7) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#5 0x7f1cc3c891e3 (/usr/lib/libpython3.14.so.1.0+0x2891e3) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#6 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#7 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#8 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#9 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#10 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#11 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#12 0x7f1cc3b990ac in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x1990ac) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#13 0x7f1cc3b8b804 (/usr/lib/libpython3.14.so.1.0+0x18b804) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#14 0x7f1cc3c76d2d in PyEval_EvalCode (/usr/lib/libpython3.14.so.1.0+0x276d2d) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#15 0x7f1cc3c95c29 (/usr/lib/libpython3.14.so.1.0+0x295c29) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#16 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#17 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#18 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#19 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#20 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#21 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#22 0x7f1cc3b990ac in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x1990ac) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#23 0x7f1cc3b8b804 (/usr/lib/libpython3.14.so.1.0+0x18b804) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#24 0x7f1cc3c76d2d in PyEval_EvalCode (/usr/lib/libpython3.14.so.1.0+0x276d2d) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#25 0x7f1cc3c95c29 (/usr/lib/libpython3.14.so.1.0+0x295c29) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#26 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#27 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#28 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#29 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
Direct leak of 768 byte(s) in 1 object(s) allocated from:
#0 0x7f1cc4320cb5 in malloc (/usr/lib/libasan.so+0x120cb5) (BuildId: 0b96d08695bbce2da9d4770c29ad2e72fb536f47)
#1 0x7f1cc3b68d83 (/usr/lib/libpython3.14.so.1.0+0x168d83) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#2 0x7f1cc3b69a53 (/usr/lib/libpython3.14.so.1.0+0x169a53) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#3 0x7f1cc3b5ff49 (/usr/lib/libpython3.14.so.1.0+0x15ff49) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#4 0x7f1cc3b6be41 in PyType_FromMetaclass (/usr/lib/libpython3.14.so.1.0+0x16be41) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#5 0x7b1cbfc68014 in __Pyx_FetchCommonTypeFromSpec /tmp/pip-install-bu_ce05l/pyyaml_c94b2d04461646e8baf6f170be2973b8/yaml/_yaml.c:28524
#6 0x7b1cbfc61602 in __pyx_CyFunction_init /tmp/pip-install-bu_ce05l/pyyaml_c94b2d04461646e8baf6f170be2973b8/yaml/_yaml.c:29701
#7 0x7b1cbfc61602 in __Pyx_InitGlobals /tmp/pip-install-bu_ce05l/pyyaml_c94b2d04461646e8baf6f170be2973b8/yaml/_yaml.c:25352
#8 0x7b1cbfc61602 in __pyx_pymod_exec__yaml /tmp/pip-install-bu_ce05l/pyyaml_c94b2d04461646e8baf6f170be2973b8/yaml/_yaml.c:23744
#9 0x7f1cc3c818e7 in PyModule_ExecDef (/usr/lib/libpython3.14.so.1.0+0x2818e7) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#10 0x7f1cc3c891e3 (/usr/lib/libpython3.14.so.1.0+0x2891e3) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#11 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#12 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#13 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#14 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#15 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#16 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#17 0x7f1cc3b990ac in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x1990ac) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#18 0x7f1cc3b8b804 (/usr/lib/libpython3.14.so.1.0+0x18b804) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#19 0x7f1cc3c76d2d in PyEval_EvalCode (/usr/lib/libpython3.14.so.1.0+0x276d2d) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#20 0x7f1cc3c95c29 (/usr/lib/libpython3.14.so.1.0+0x295c29) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#21 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#22 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#23 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#24 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#25 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#26 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#27 0x7f1cc3b990ac in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x1990ac) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#28 0x7f1cc3b8b804 (/usr/lib/libpython3.14.so.1.0+0x18b804) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#29 0x7f1cc3c76d2d in PyEval_EvalCode (/usr/lib/libpython3.14.so.1.0+0x276d2d) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#30 0x7f1cc3c95c29 (/usr/lib/libpython3.14.so.1.0+0x295c29) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#31 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
Direct leak of 1 byte(s) in 1 object(s) allocated from:
#0 0x7f1cc4320cb5 in malloc (/usr/lib/libasan.so+0x120cb5) (BuildId: 0b96d08695bbce2da9d4770c29ad2e72fb536f47)
#1 0x7f1cc3b621ff in PyMem_Malloc (/usr/lib/libpython3.14.so.1.0+0x1621ff) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#2 0x7f1cc3c8188b in PyModule_ExecDef (/usr/lib/libpython3.14.so.1.0+0x28188b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#3 0x7f1cc3c891e3 (/usr/lib/libpython3.14.so.1.0+0x2891e3) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#4 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#5 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#6 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#7 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#8 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#9 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#10 0x7f1cc3b990ac in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x1990ac) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#11 0x7f1cc3b8b804 (/usr/lib/libpython3.14.so.1.0+0x18b804) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#12 0x7f1cc3c76d2d in PyEval_EvalCode (/usr/lib/libpython3.14.so.1.0+0x276d2d) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#13 0x7f1cc3c95c29 (/usr/lib/libpython3.14.so.1.0+0x295c29) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#14 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#15 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#16 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#17 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#18 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#19 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#20 0x7f1cc3b990ac in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x1990ac) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#21 0x7f1cc3b8b804 (/usr/lib/libpython3.14.so.1.0+0x18b804) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#22 0x7f1cc3c76d2d in PyEval_EvalCode (/usr/lib/libpython3.14.so.1.0+0x276d2d) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#23 0x7f1cc3c95c29 (/usr/lib/libpython3.14.so.1.0+0x295c29) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#24 0x7f1cc3b94f93 in _PyEval_EvalFrameDefault (/usr/lib/libpython3.14.so.1.0+0x194f93) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#25 0x7f1cc3bbe86b (/usr/lib/libpython3.14.so.1.0+0x1be86b) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#26 0x7f1cc3baf890 (/usr/lib/libpython3.14.so.1.0+0x1af890) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#27 0x7f1cc3bef626 in PyObject_CallMethodObjArgs (/usr/lib/libpython3.14.so.1.0+0x1ef626) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#28 0x7f1cc3bee784 in PyImport_ImportModuleLevelObject (/usr/lib/libpython3.14.so.1.0+0x1ee784) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
#29 0x7f1cc3c78823 in _PyEval_ImportName (/usr/lib/libpython3.14.so.1.0+0x278823) (BuildId: 52cae3244274805bf3e4640e0f90a8a50c9643c9)
This is on Arch Linux with GCC 15.2.1 (concretely, for libasan I get libasan 15.2.1+r604+g0b99615a8aef-1) and pyyaml. 6.0.3-2. I tried to install 6.0.2 since I have a different environment (Alma 9) with GCC 15 and pyyaml 6.0.2 where this doesn't happen but I still get the same leaks. The context is that I was investigating leaks in a different program and found it was due to importing pyyaml. I guess the next step is to build Python with debug symbols to be able to see what's going on.