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Hi! I have a problem (segfault) with multithreaded application that uses ImageMagick that uses libpng that uses zlib 1.2.8 with Intel IPP patch version 2017 update 3. I can't reproduce a crash with the same images that are processed when application had crashed. This looks like a race. Moreover when I try to inspect every coredump created by this app, I have corrupted stacktrace:
#0 0x00007f611b740720 in LWIN_COPY03byte8gas_1 () #1 0x00007f5f6b610730 in ?? () #2 0x00007f5f6b610738 in ?? () #3 0x00007f5f6b6106d0 in ?? () #4 0x00007f5f6b610798 in ?? () #5 0x00007f5f6b610728 in ?? () #6 0x00007f5f6b6106e0 in ?? () #7 0x000000000000001e in ?? () #8 0x0000000000008000 in ?? () #9 0x0000000000007fff in ?? () #10 0x0000000000000001 in ?? () #11 0x0000001b00000009 in ?? () #12 0x0000000000000102 in ?? () #13 0x00007f5dc49bb580 in ?? () #14 0x0000000000000007 in ?? () #15 0x0000000000000009 in ?? () #16 0x0000000000000001 in ?? () #17 0x00007f5f6b610780 in ?? () #18 0x00007f611b6f0bf4 in e9_ippsInflate_8u ()
My setup:
Ubuntu 14.04, zlib was built in according to readme of Intel patch
libpng12-0=1.2.54-1ubuntu2
Problem was reproduced on Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz and Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz cpus
Could this be related to the following problem: https://software.intel.com/en-us/forums/intel-integrated-performance-primitives/topic/288222 ?
Could you please help me to debug the problem?
Thanks, Igor
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I have more info about the problem:
in all previous attempts I ran my app with jemalloc 3.5.1. Now I run app with default glibc allocator and no more segfaults.
Looks like problem with Intel patch and jemalloc interaction.
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Hi Igor,
Thank you for notifying us! We fixed the similar problem in the upcoming Intel(R) IPP release (next major). May be, it will resolve your issue too.
As a workaround you can use standard allocator, or continue to use jemalloc, but to allocate "size+64" bytes. I don't know how it is done in ImageMagick + libpng, but try to update memory allocation code to really allocate 64 bytes more.
Regards,
Sergey
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