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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: Fri, 08 Jul 2022 12:26:52 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29327

--- Comment #9 from Dr. Werner Fink <werner at suse dot de> ---
(In reply to Noah Goldstein from comment #3)
> Are there any steps for reproduction?

I've tried the memusage script of glibc utils to debug memory consumption of
kodi Matric 19.4, this works like this:

 export LD_PRELOAD=3D/lib64/libmemusage.so
 export MEMUSAGE_OUTPUT=3D/dev/null
 export MEMUSAGE_TRACE_MMAP=3Dyes

but this make gdb a memory huge eating all physical RAM.

Therefore I tried to set the environment in gdb its self:

 gdb --args /usr/lib64/kodi/kodi.bin
 [...]
 (gdb) set environment LD_PRELOAD /lib64/libmemusage.so
 (gdb) set environment MEMUSAGE_OUTPUT /dev/null
 (gdb) set environment MEMUSAGE_TRACE_MMAP yes
 (gdb) run
 Starting program: /usr/lib64/kodi/kodi.bin=20

 Program terminated with signal SIGPROF, Profiling timer expired.
 The program no longer exists.
 (gdb) br memset
 Breakpoint 1 at 0x705f80 (2 locations)
 (gdb) run
 Starting program: /usr/lib64/kodi/kodi.bin=20

 Breakpoint 1, memset () at
../sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S:125
 125     ENTRY (MEMSET_SYMBOL (__memset, unaligned))
 (gdb) list
 120             cmp     %RDX_LP, %RCX_LP
 121             jb      HIDDEN_JUMPTARGET (__chk_fail)
 122     END_CHK (MEMSET_CHK_SYMBOL (__memset_chk, unaligned))
 123     #endif
 124
 125     ENTRY (MEMSET_SYMBOL (__memset, unaligned))
 126             MEMSET_VDUP_TO_VEC0_AND_SET_RETURN (%esi, %rdi)
 127     # ifdef __ILP32__
 128             /* Clear the upper 32 bits.  */
 129             mov     %edx, %edx

 (gdb) print $rdi
 $1 =3D 140737353858200
 (gdb) print $rdx
 $2 =3D 36
 (gdb) print $esi
 $3 =3D 0

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