Bug#970558: openblas: segfault in zgemm_oncopy_EMAG8180 during sagemath test on arm64

[Tobias Hansen]

Control: tags -1 + fixed-upstream patch

The bug was fixed upstream in the linked issue. Can we apply the attached upstream patch?

Best,
Tobias

On Fri, 18 Sep 2020 18:09:01 +0200 Tobias Hansen <thansen at debian.org> wrote:
> Package: libopenblas0
> Version: 0.3.10+ds-3
> Severity: normal
> 
> Hi,
> 
> a sagemath test segfaulted in libopenblas.so.0 / zgemm_oncopy_EMAG8180 when building on arm-ubc-01.debian.org,
> 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 #966175 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
> 
> Best,
> Tobias
> 
> 
> 
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