[Bug ports/14238] New: tilegx: robust mutexes hang

[Bug ports/14238] New: tilegx: robust mutexes hang

[cmetcalf at tilera dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14238

             Bug #: 14238
           Summary: tilegx: robust mutexes hang
           Product: glibc
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ports
        AssignedTo: unassigned@sourceware.org
        ReportedBy: cmetcalf@tilera.com
                CC: carlos@systemhalted.org, roland@gnu.org
    Classification: Unclassified


The glibc testsuite reports five unit tests failing:

nptl/tst-robust1.out
nptl/tst-robust3.out
nptl/tst-robust4.out
nptl/tst-robust6.out
nptl/tst-robust9.out

I looked at the first one, and it seems like it is hanging in the LOCK(&m1)
call in tst-robust1.c, where we are checking that the lock will exit and return
with errno = EOWNERDEAD if the owner dies with the lock held.  In fact it stays
stuck in the lock code, here:

#0  __lll_robust_lock_wait (futex=0x23a08, private=128)
    at ../nptl/sysdeps/unix/sysv/linux/lowlevelrobustlock.c:52
#1  0x000000aaaaabb580 in __lll_robust_lock (mutex=0x23a08)
    at ../sysdeps/unix/sysv/linux/tile/nptl/lowlevellock.h:180
#2  __pthread_mutex_lock_full (mutex=0x23a08) at pthread_mutex_lock.c:220
[...]

Note that these tests all pass on tilepro (and x86_64, etc.), and note that the
"robustpi" tests all pass on both tile platforms.

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[Bug ports/14238] tilegx: robust mutexes hang

[cmetcalf at tilera dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14238

Chris Metcalf <cmetcalf at tilera dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #1 from Chris Metcalf <cmetcalf at tilera dot com> 2012-06-16 21:01:52 UTC ---
This turned out to be a kernel bug introduced in the 3.4 merge window.  Commit
6699c8cda36f29 ("tile: fix bug in get_user() for 4-byte values") fixes it and
should be taken into the next -rc.

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[Bug ports/14238] tilegx: robust mutexes hang

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=14238

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|                            |security-

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