[issue25470] Random Malloc error raised

[augustin rieunier]

New submission from augustin rieunier:

Hello there, 
I face random malloc error in my code.
I recently added lots of json dumps/loads operation as I plugged my application 
with redis.

Here's the error raised, and Valgrind information right after:

127.0.0.1 - - [24/Oct/2015 15:57:44] "DELETE 
/api/private/v1.0/contentcategories/ HTTP/1.1" 404 -
python: malloc.c:2372: sysmalloc: Assertion `(old_top == (((mbinptr) (((char *) 
&((av)->bins[((1) - 1) * 2])) - __builtin_offsetof (struct malloc_chunk, fd 
&& old_size == 0) || ((unsigned long) (old_size) >= (unsigned 
long)__builtin_offsetof (struct malloc_chunk, fd_nextsize))+((2 
*(sizeof(size_t))) - 1)) & ~((2 *(sizeof(size_t))) - 1))) && ((old_top)->size & 
0x1) && ((unsigned long) old_end & pagemask) == 0)' failed.
==18768== Invalid read of size 4
==18768==at 0x55ACE1: PyObject_Free (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x52AB40: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x546605: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5BB178: _PyGC_CollectNoFail (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x566C18: PyImport_Cleanup (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469C8E: Py_Finalize (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469D82: Py_Exit (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469EC0: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469EDE: PyErr_PrintEx (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x47BE98: PyRun_SimpleFileExFlags (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5BF712: Py_Main (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x47E350: main (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==  Address 0x6d70020 is 1,536 bytes inside a block of size 1,568 free'd
==18768==at 0x4C2BDEC: free (in 
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18768==by 0x5540D5: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5465F4: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5BB178: _PyGC_CollectNoFail (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x566C18: PyImport_Cleanup (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469C8E: Py_Finalize (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469D82: Py_Exit (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469EC0: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469EDE: PyErr_PrintEx (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x47BE98: PyRun_SimpleFileExFlags (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5BF712: Py_Main (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x47E350: main (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768== 
==18768== Invalid read of size 4
==18768==at 0x55ACE1: PyObject_Free (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x529CE6: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x553633: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x553728: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5465F4: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x5BB178: _PyGC_CollectNoFail (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x566C18: PyImport_Cleanup (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469C8E: Py_Finalize (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469D82: Py_Exit (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469EC0: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x469EDE: PyErr_PrintEx (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==by 0x47BE98: PyRun_SimpleFileExFlags (in 
/home/dev/Desktop/PROJ/git/api_clone/api/flask/bin/python3.4)
==18768==  Address 0x7dc6020 is 144 bytes inside a block of size 224 free'd
==18768==at 0x4C2BDEC: free (in 
/usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==18768==by 0x553459: ??? (in 
/home/dev/Desktop/PROJ/git/api_clone/api/f

[issue25470] Random Malloc error raised

[augustin rieunier]

Changes by augustin rieunier :


--
type:  -> crash

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[issue25470] Random Malloc error raised

[augustin rieunier]

augustin rieunier added the comment:

I should be able to reproduce it yes.
Can't really give the code, as it's in a big program i'm working on, and it's 
never at the same place ..
One thing though: it never happened on QA/UAT environments. So it might be 
linked to something (libs, programs) on my dev environment.

Will update this with gdb data when I have some time :)

--

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