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From: "goldstein.w.n at gmail dot com" <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 15:50:45 +0000 [thread overview]
Message-ID: <bug-29327-131-MLl658RvWH@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-29327-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=29327
--- Comment #12 from Noah Goldstein <goldstein.w.n at gmail dot com> ---
(In reply to Dr. Werner Fink from comment #9)
> (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=/lib64/libmemusage.so
> export MEMUSAGE_OUTPUT=/dev/null
> export MEMUSAGE_TRACE_MMAP=yes
>
> 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
>
> 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
>
> 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 = 140737353858200
> (gdb) print $rdx
> $2 = 36
> (gdb) print $esi
> $3 = 0
I don't see how those values could segfault,
Are you sure `rdi` points to valid memory?
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next prev parent reply other threads:[~2022-07-08 15:50 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-07 11:54 [Bug libc/29327] New: " werner at suse dot de
2022-07-07 11:55 ` [Bug libc/29327] " werner at suse dot de
2022-07-07 11:56 ` werner at suse dot de
2022-07-07 12:07 ` werner at suse dot de
2022-07-07 17:50 ` [Bug string/29327] " fweimer at redhat dot com
2022-07-07 18:24 ` goldstein.w.n at gmail dot com
2022-07-07 18:52 ` goldstein.w.n at gmail dot com
2022-07-07 19:26 ` goldstein.w.n at gmail dot com
2022-07-07 20:03 ` hjl.tools at gmail dot com
2022-07-07 20:10 ` goldstein.w.n at gmail dot com
2022-07-08 12:03 ` werner at suse dot de
2022-07-08 12:26 ` werner at suse dot de
2022-07-08 12:29 ` werner at suse dot de
2022-07-08 14:29 ` hjl.tools at gmail dot com
2022-07-08 15:50 ` goldstein.w.n at gmail dot com [this message]
2022-07-11 8:15 ` werner at suse dot de
2022-07-11 8:23 ` werner at suse dot de
2022-07-11 14:10 ` hjl.tools at gmail dot com
2022-07-12 7:02 ` werner at suse dot de
2022-07-12 7:12 ` werner at suse dot de
2022-07-12 7:20 ` werner at suse dot de
2022-07-12 14:47 ` hjl.tools at gmail dot com
2022-07-12 15:46 ` hjl.tools at gmail dot com
2022-07-13 9:22 ` werner at suse dot de
2022-07-13 14:30 ` hjl.tools at gmail dot com
2022-07-13 15:47 ` goldstein.w.n at gmail dot com
2022-07-14 7:36 ` werner at suse dot de
2022-07-14 15:42 ` hjl.tools at gmail dot com
2022-07-19 9:58 ` werner at suse dot de
2022-07-19 17:47 ` hjl.tools at gmail dot com
2022-07-22 11:04 ` werner at suse dot de
2022-07-22 11:13 ` werner at suse dot de
2022-07-22 14:26 ` goldstein.w.n at gmail dot com
2022-07-25 6:00 ` werner at suse dot de
2022-07-25 14:20 ` werner at suse dot de
2022-07-28 11:44 ` bww9643 at gmail dot com
2022-07-28 11:46 ` bww9643 at gmail dot com
2022-08-09 12:46 ` werner at suse dot de
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