[valgrind] [Bug 434849] The vdso is not available when running on ppc64*
https://bugs.kde.org/show_bug.cgi?id=434849 --- Comment #5 from Tulio Magno Quites Machado Filho --- (In reply to Mark Wielaard from comment #4) > Although in the case of glibc backtrace () we might also request a bug > fix/workaround in glibc. glibc's backtrace implementation has been removed in version 2.35 Source: https://sourceware.org/git/?p=glibc.git;a=commit;h=82fd7314c7df8cdce027df6f2c98ca5a927f So, I believe the fix you're expecting has already been implemented. -- You are receiving this mail because: You are watching all bug changes.
[valgrind] [Bug 434849] The vdso is not available when running on ppc64*
https://bugs.kde.org/show_bug.cgi?id=434849 Mark Wielaard changed: What|Removed |Added Status|REPORTED|RESOLVED Resolution|--- |DUPLICATE --- Comment #4 from Mark Wielaard --- This was rediscovered in bug #446123 which has a bit more technical background. We might simply have to keep track of the vdso too (we currently don't, that is why we remove AT_SYSINFO_EHDR) Although in the case of glibc backtrace () we might also request a bug fix/workaround in glibc. *** This bug has been marked as a duplicate of bug 446123 *** -- You are receiving this mail because: You are watching all bug changes.
[valgrind] [Bug 434849] The vdso is not available when running on ppc64*
https://bugs.kde.org/show_bug.cgi?id=434849
pedro...@linux.ibm.com changed:
What|Removed |Added
CC||pedro...@linux.ibm.com
--- Comment #3 from pedro...@linux.ibm.com ---
(In reply to Mark Wielaard from comment #2)
> This is done deliberately, see coregrind/m_initimg/initimg-linux.c
> (setup_client_stack):
>
> case AT_SYSINFO_EHDR: {
> /* Trash this, because we don't reproduce it */
> const NSegment* ehdrseg =
> VG_(am_find_nsegment)((Addr)auxv->u.a_ptr);
> vg_assert(ehdrseg);
> VG_(am_munmap_valgrind)(ehdrseg->start, ehdrseg->end -
> ehdrseg->start);
> auxv->a_type = AT_IGNORE;
> break;
> }
>
It seems that this case statement is #ifdefed out for ppc, and some other
arches, correct? So shouldn't AT_SYSINFO_EHDR, and the vDSO, be available for
these arches?
> Is there a reason you need AT_SYSINFO_EHDR?
It's used in glibc for ppc for the backtrace function that prints out return
addresses for all frames in a stack. The symbol from the vDSO for the signal
trampoline is used to handle the backtrace when there's a signal, which doesn't
work when it's run under Valgrind, due to the missing vDSO.
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[valgrind] [Bug 434849] The vdso is not available when running on ppc64*
https://bugs.kde.org/show_bug.cgi?id=434849
Mark Wielaard changed:
What|Removed |Added
CC||m...@klomp.org
--- Comment #2 from Mark Wielaard ---
This is done deliberately, see coregrind/m_initimg/initimg-linux.c
(setup_client_stack):
case AT_SYSINFO_EHDR: {
/* Trash this, because we don't reproduce it */
const NSegment* ehdrseg =
VG_(am_find_nsegment)((Addr)auxv->u.a_ptr);
vg_assert(ehdrseg);
VG_(am_munmap_valgrind)(ehdrseg->start, ehdrseg->end -
ehdrseg->start);
auxv->a_type = AT_IGNORE;
break;
}
So the application should use actual syscalls instead of using that magic vdso
page when running under valgrind.
Is there a reason you need AT_SYSINFO_EHDR?
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[valgrind] [Bug 434849] The vdso is not available when running on ppc64*
https://bugs.kde.org/show_bug.cgi?id=434849 --- Comment #1 from Carl Love --- The issue does not appear to be just on the PPC platform. I tried the same test on my Intel laptop running a REL release more /etc/redhat-release Red Hat Enterprise Linux release 8.3 (Ootpa) and see the same issue LD_SHOW_AUXV=1 valgrind /bin/true AT_SYSINFO_EHDR: 0x7ffc587c4000 AT_HWCAP:bfebfbff AT_PAGESZ: 4096 AT_CLKTCK: 100 AT_PHDR: 0x559a635f1040 AT_PHENT:56 AT_PHNUM:11 AT_BASE: 0x7f5ced33d000 AT_FLAGS:0x0 AT_ENTRY:0x559a635f2580 AT_UID: 1000 AT_EUID: 1000 AT_GID: 1000 AT_EGID: 1000 AT_SECURE: 0 AT_RANDOM: 0x7ffc5864ab99 AT_HWCAP2: 0x0 AT_EXECFN: /usr/bin/valgrind AT_PLATFORM: x86_64 ==39447== Memcheck, a memory error detector ==39447== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==39447== Using Valgrind-3.16.0 and LibVEX; rerun with -h for copyright info ==39447== Command: /bin/true ==39447== AT_HWCAP:bfebfbff AT_PAGESZ: 4096 AT_CLKTCK: 100 AT_PHDR: 0x108040 AT_PHENT:56 AT_PHNUM:10 AT_BASE: 0x400 AT_FLAGS:0x0 AT_ENTRY:0x109740 AT_UID: 1000 AT_EUID: 1000 AT_GID: 1000 AT_EGID: 1000 AT_SECURE: 0 AT_RANDOM: 0x1fff000fdc AT_EXECFN: /bin/true AT_PLATFORM: x86_64 ==39447== ==39447== HEAP SUMMARY: ==39447== in use at exit: 0 bytes in 0 blocks ==39447== total heap usage: 0 allocs, 0 frees, 0 bytes allocated ==39447== ==39447== All heap blocks were freed -- no leaks are possible ==39447== ==39447== For lists of detected and suppressed errors, rerun with: -s ==39447== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) -- You are receiving this mail because: You are watching all bug changes.
[valgrind] [Bug 434849] The vdso is not available when running on ppc64*
https://bugs.kde.org/show_bug.cgi?id=434849 Will Schmidt changed: What|Removed |Added CC||c...@us.ibm.com, ||will_schm...@vnet.ibm.com -- You are receiving this mail because: You are watching all bug changes.
