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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()
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* [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
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* [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.
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* [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
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* [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.
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end of thread, other threads:[~2014-11-07 0:41 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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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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