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segfault in zgemm_oncopy_EMAG8180 during sagemath test on arm64 #2959

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tobihan opened this issue Oct 31, 2020 · 1 comment · Fixed by #2963
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segfault in zgemm_oncopy_EMAG8180 during sagemath test on arm64 #2959

tobihan opened this issue Oct 31, 2020 · 1 comment · Fixed by #2963

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@tobihan
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tobihan commented Oct 31, 2020

Hi,

a sagemath test segfaulted in openblas 0.3.10, libopenblas.so.0 / zgemm_oncopy_EMAG8180 when building on arm64, see https://buildd.debian.org/status/fetch.php?pkg=sagemath&arch=arm64&ver=9.2%7Ebeta12-1&stamp=1599922222&raw=0

openblas was called by numpy and the issue looks similar to #2728 where the segfault occurred in dgemm_oncopy_HASWELL.

Extract from the stack backtrace:

#5  0x0000ffffab2fe3b0 in zgemm_oncopy_EMAG8180 () from /usr/lib/aarch64-linux-gnu/libopenblas.so.0
#6  0x0000ffffaaac8430 in zgetrf_single () from /usr/lib/aarch64-linux-gnu/libopenblas.so.0
#7  0x0000ffffaa064f3c in zgesv_ () from /usr/lib/aarch64-linux-gnu/liblapack.so.3
#8  0x0000ffffaa00f330 in ?? () from /usr/lib/python3/dist-packages/numpy/linalg/_umath_linalg.cpython-38-aarch64-linux-gnu.so

In Debian this is reported as https://bugs.debian.org/970558

Best,
Tobias
@martin-frbg
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martin-frbg commented Oct 31, 2020 •
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You are probably right that this is a rerun of #2728 - I appear to have overlooked that common_arm64.h has the same disparity of BUFFERSIZE setting between models that caused the problems in DYNAMIC_ARCH builds on x86_64. (Need to check now if simple phone hardware supports the settings used for servers)

@martin-frbg martin-frbg mentioned this issue Oct 31, 2020
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raspbian-autopush pushed a commit to raspbian-packages/openblas that referenced this issue Nov 5, 2020
@svillemot
Reunify default BUFFER_SIZE on ARM64 to avoid crashes in DYNAMIC_ARCH
a792ef7 
Origin: upstream, OpenMathLib/OpenBLAS@7f26be4
Bug: OpenMathLib/OpenBLAS#2959
Bug-Debian: https://bugs.debian.org/970558
Last-Update: 2020-11-01

Last-Update: 2020-11-01
Gbp-Pq: Name reunify-arm64-buffersize.patch
@tobihan tobihan mentioned this issue Nov 22, 2020
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Reunify default BUFFER_SIZE on ARM64 to avoid crashes in DYNAMIC_ARCH mode
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@tobihan @martin-frbg