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* [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM
[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
@ 2021-04-21 18:26 ` cvs-commit at gcc dot gnu.org
2021-07-28 17:26 ` florian at openwrt dot org
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2021-04-21 18:26 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=24774
--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Florian Weimer <fw@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=fada9018199c21c469ff0e731ef75c6020074ac9
commit fada9018199c21c469ff0e731ef75c6020074ac9
Author: Florian Weimer <fweimer@redhat.com>
Date: Wed Apr 21 19:49:51 2021 +0200
dlfcn: dlerror needs to call free from the base namespace [BZ #24773]
Calling free directly may end up freeing a pointer allocated by the
dynamic loader using malloc from libc.so in the base namespace using
the allocator from libc.so in a secondary namespace, which results in
crashes.
This commit redirects the free call through GLRO and the dynamic
linker, to reach the correct namespace. It also cleans up the dlerror
handling along the way, so that pthread_setspecific is no longer
needed (which avoids triggering bug 24774).
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* [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM
[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
2021-04-21 18:26 ` [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM cvs-commit at gcc dot gnu.org
@ 2021-07-28 17:26 ` florian at openwrt dot org
2021-09-08 6:14 ` fweimer at redhat dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: florian at openwrt dot org @ 2021-07-28 17:26 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=24774
Florian Fainelli <florian at openwrt dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |florian at openwrt dot org
--- Comment #2 from Florian Fainelli <florian at openwrt dot org> ---
I can confirm that the reproducer still fails here with glibc 2.27.
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* [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM
[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
2021-04-21 18:26 ` [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM cvs-commit at gcc dot gnu.org
2021-07-28 17:26 ` florian at openwrt dot org
@ 2021-09-08 6:14 ` fweimer at redhat dot com
2021-09-08 6:19 ` fweimer at redhat dot com
` (2 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2021-09-08 6:14 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=24774
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
Yes, the reference to this bug in comment 1 is incorrect, it should have been
bug 24776.
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* [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM
[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
` (2 preceding siblings ...)
2021-09-08 6:14 ` fweimer at redhat dot com
@ 2021-09-08 6:19 ` fweimer at redhat dot com
2021-09-08 13:15 ` adhemerval.zanella at linaro dot org
2022-10-07 20:34 ` adhemerval.zanella at linaro dot org
5 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2021-09-08 6:19 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=24774
--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
This looks like a bug in our atomics, as reported here:
Glibc pthread_rwlock_timed*() Optimization Bug
https://sourceware.org/pipermail/libc-help/2021-September/006004.html
include/atomic.h has:
# ifndef atomic_load_relaxed
# define atomic_load_relaxed(mem) \
({ __typeof ((__typeof (*(mem))) *(mem)) __atg100_val; \
__asm ("" : "=r" (__atg100_val) : "0" (*(mem))); \
__atg100_val; })
# endif
The expression *(mem) does not necessary read from the memory location.
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* [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM
[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
` (3 preceding siblings ...)
2021-09-08 6:19 ` fweimer at redhat dot com
@ 2021-09-08 13:15 ` adhemerval.zanella at linaro dot org
2022-10-07 20:34 ` adhemerval.zanella at linaro dot org
5 siblings, 0 replies; 6+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2021-09-08 13:15 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=24774
Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |adhemerval.zanella at linaro dot o
| |rg
--- Comment #5 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
I think we can use USE_ATOMIC_COMPILER_BUILTINS for arm.
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* [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM
[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
` (4 preceding siblings ...)
2021-09-08 13:15 ` adhemerval.zanella at linaro dot org
@ 2022-10-07 20:34 ` adhemerval.zanella at linaro dot org
5 siblings, 0 replies; 6+ messages in thread
From: adhemerval.zanella at linaro dot org @ 2022-10-07 20:34 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=24774
Adhemerval Zanella <adhemerval.zanella at linaro dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |2.37
Assignee|unassigned at sourceware dot org |adhemerval.zanella at linaro dot o
| |rg
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #6 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
Fixed on 2.37.
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[not found] <bug-24774-131@http.sourceware.org/bugzilla/>
2021-04-21 18:26 ` [Bug nptl/24774] pthread_rwlock_timedwrlock stalls on ARM cvs-commit at gcc dot gnu.org
2021-07-28 17:26 ` florian at openwrt dot org
2021-09-08 6:14 ` fweimer at redhat dot com
2021-09-08 6:19 ` fweimer at redhat dot com
2021-09-08 13:15 ` adhemerval.zanella at linaro dot org
2022-10-07 20:34 ` adhemerval.zanella at linaro dot org
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