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* [Bug nptl/17561] New: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() @ 2014-11-06 19:57 aaro.koskinen at iki dot fi 2014-11-06 20:01 ` [Bug nptl/17561] " aaro.koskinen at iki dot fi ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: aaro.koskinen at iki dot fi @ 2014-11-06 19:57 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=17561 Bug ID: 17561 Summary: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() Product: glibc Version: 2.20 Status: NEW Severity: normal Priority: P2 Component: nptl Assignee: unassigned at sourceware dot org Reporter: aaro.koskinen at iki dot fi CC: drepper.fsp at gmail dot com The following program fails with illegal instruction on x86_64 on HW where _xend() is not supported (even if it would the behaviour is not probably correct): $ cat foo.c #include <pthread.h> #include <stdio.h> int main(void) { pthread_rwlock_t _lock; pthread_rwlock_init(&_lock, 0); pthread_rwlock_wrlock(&_lock); pthread_rwlock_unlock(&_lock); pthread_rwlock_unlock(&_lock); pthread_rwlock_destroy(&_lock); return 0; } $ gcc foo.c -lpthread $ ./a.out Illegal instruction This is caused by __pthread_rwlock_unlock() -> ELIDE_UNLOCK() -> _xend() -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug nptl/17561] GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() 2014-11-06 19:57 [Bug nptl/17561] New: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() aaro.koskinen at iki dot fi @ 2014-11-06 20:01 ` aaro.koskinen at iki dot fi 2014-11-06 20:54 ` fweimer at redhat dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: aaro.koskinen at iki dot fi @ 2014-11-06 20:01 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=17561 Aaro Koskinen <aaro.koskinen at iki dot fi> changed: What |Removed |Added ---------------------------------------------------------------------------- Target| |x86_64-linux-gnu Host| |x86_64-linux-gnu Build| |x86_64-linux-gnu -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug nptl/17561] GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() 2014-11-06 19:57 [Bug nptl/17561] New: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() aaro.koskinen at iki dot fi 2014-11-06 20:01 ` [Bug nptl/17561] " aaro.koskinen at iki dot fi @ 2014-11-06 20:54 ` fweimer at redhat dot com 2014-11-06 21:03 ` aaro.koskinen at iki dot fi 2014-11-07 0:41 ` andi-bz at firstfloor dot org 3 siblings, 0 replies; 5+ messages in thread From: fweimer at redhat dot com @ 2014-11-06 20:54 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=17561 Florian Weimer <fweimer at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |fweimer at redhat dot com Resolution|--- |INVALID Flags| |security- --- Comment #1 from Florian Weimer <fweimer at redhat dot com> --- This test case is invalid. Calling pthread_rwlock_unlock on an rwlock which is not locked is undefined. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug nptl/17561] GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() 2014-11-06 19:57 [Bug nptl/17561] New: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() aaro.koskinen at iki dot fi 2014-11-06 20:01 ` [Bug nptl/17561] " aaro.koskinen at iki dot fi 2014-11-06 20:54 ` fweimer at redhat dot com @ 2014-11-06 21:03 ` aaro.koskinen at iki dot fi 2014-11-07 0:41 ` andi-bz at firstfloor dot org 3 siblings, 0 replies; 5+ messages in thread From: aaro.koskinen at iki dot fi @ 2014-11-06 21:03 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=17561 --- Comment #2 from Aaro Koskinen <aaro.koskinen at iki dot fi> --- Ok, such programs can be considered broken. I was also pointed a workaround if you still need to run such: https://github.com/andikleen/tsx-tools/blob/master/ignore-xend.c -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug nptl/17561] GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() 2014-11-06 19:57 [Bug nptl/17561] New: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() aaro.koskinen at iki dot fi ` (2 preceding siblings ...) 2014-11-06 21:03 ` aaro.koskinen at iki dot fi @ 2014-11-07 0:41 ` andi-bz at firstfloor dot org 3 siblings, 0 replies; 5+ messages in thread From: andi-bz at firstfloor dot org @ 2014-11-07 0:41 UTC (permalink / raw) To: glibc-bugs https://sourceware.org/bugzilla/show_bug.cgi?id=17561 Andi Kleen <andi-bz at firstfloor dot org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |andi-bz at firstfloor dot org --- Comment #3 from Andi Kleen <andi-bz at firstfloor dot org> --- Yes don't do that as it's undefined. In theory it would be possible to put a workaround into glibc for it, but it would make the unlock path slower and so far it was not deemed needed for this undefined case. -- You are receiving this mail because: You are on the CC list for the bug. ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2014-11-07 0:41 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2014-11-06 19:57 [Bug nptl/17561] New: GLIBC 2.20 results in SIGILL on x86_64 with double pthread_rwlock_unlock() aaro.koskinen at iki dot fi 2014-11-06 20:01 ` [Bug nptl/17561] " aaro.koskinen at iki dot fi 2014-11-06 20:54 ` fweimer at redhat dot com 2014-11-06 21:03 ` aaro.koskinen at iki dot fi 2014-11-07 0:41 ` andi-bz at firstfloor dot org
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