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From: "werner at suse dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug string/29327] A SIGSEGV in hardware optimized memset for sse2
 __memset_sse2_unaligned_erms()
Date: Thu, 14 Jul 2022 07:36:26 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29327

--- Comment #24 from Dr. Werner Fink <werner at suse dot de> ---
Created attachment 14209
  --> https://sourceware.org/bugzilla/attachment.cgi?id=3D14209&action=3Ded=
it
dumpctl.log

(In reply to Noah Goldstein from comment #23)
> (In reply to H.J. Lu from comment #22)
> > (In reply to Dr. Werner Fink from comment #21)
> > > (In reply to H.J. Lu from comment #20)
> > > > (In reply to Dr. Werner Fink from comment #16)
> > > > > Created attachment 14205 [details]
> > > > > audit.log
> > >=20
> > > [...]
> > >=20
> > > >=20
> > > > We need the audit.log from crash.
> > >=20
> > > Yes ... this should be
> > > https://sourceware.org/bugzilla/attachment.cgi?id=3D14205
> >=20
> > But your command was
> >=20
> > /kodi> ( setenv LD_AUDIT ./auditmod.so ; /usr/lib64/kodi/kodi.bin ) | &=
 tee
> > audit.log
> >=20
> > and it didn't crash.
>=20
> Likewise for:
> pltenter: memset: dst=3D0x7ff43008ed78, src=3D0, len=3D8
>=20
> I don't see this would segfault if `dst` has write permissions.

If I try both

  LD_AUDIT=3D${PWD}/auditmod.so LD_PRELOAD=3D/lib64/libmemusage.so

it simply crashes with a SIGSEGV

  werner@noether:/usr/src/werner/auditmod> LD_AUDIT=3D${PWD}/auditmod.so
LD_PRELOAD=3D/lib64/libmemusage.so /usr/lib64/kodi/kodi.bin=20
  version: 2
  Segmentation fault (core dumped)

no output from auditmod.so ... only a core dump

  werner@noether:/usr/src/werner/auditmod> sudo coredumpctl | tail -n 1
  Thu 2022-07-14 09:30:28 CEST 16275 223  50 SIGSEGV present=20
/usr/lib64/kodi/kodi.bin

  werner@noether:/usr/src/werner/auditmod> sudo coredumpctl dump 16275 -o
/tmp/core > dumpctl.log 2>&1

--=20
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