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* [Bug libitm/52526] New: libitm: stuck in futex_wait
@ 2012-03-07 22:41 patrick.marlier at gmail dot com
2012-03-08 12:43 ` [Bug libitm/52526] " torvald at gcc dot gnu.org
` (5 more replies)
0 siblings, 6 replies; 7+ messages in thread
From: patrick.marlier at gmail dot com @ 2012-03-07 22:41 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
Bug #: 52526
Summary: libitm: stuck in futex_wait
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libitm
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: patrick.marlier@gmail.com
CC: torvald@gcc.gnu.org
Host: x86_64-unknown-linux-gnu
Target: x86_64-unknown-linux-gnu
libitm (default configuration/4.8.0 20120307) is stuck in futex_wait with STAMP
kmeans with low contention and 8 threads.
(gdb) info threads
Id Target Id Frame
8 Thread 0x7ffff322b700 (LWP 24011) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
7 Thread 0x7ffff3a2c700 (LWP 24010) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
6 Thread 0x7ffff422d700 (LWP 24009) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
5 Thread 0x7ffff4a2e700 (LWP 24008) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
* 4 Thread 0x7ffff522f700 (LWP 24007) "kmeans" GTM::futex_wait
(addr=0x7ffff7fdfbb8, val=1)
at ../../../gcc-trunk/libitm/config/linux/futex.cc:49
3 Thread 0x7ffff5a30700 (LWP 24006) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
2 Thread 0x7ffff6231700 (LWP 24005) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
1 Thread 0x7ffff73aa720 (LWP 24002) "kmeans" 0x0000003ecb40c14c in
pthread_barrier_wait () from /lib64/libpthread.so.0
(gdb) thread 5
[Switching to thread 5 (Thread 0x7ffff4a2e700 (LWP 24008))]
#0 0x0000003ecb40c14c in pthread_barrier_wait () from /lib64/libpthread.so.0
(gdb) bt
#0 0x0000003ecb40c14c in pthread_barrier_wait () from /lib64/libpthread.so.0
#1 0x0000000000403099 in threadWait ()
#2 0x0000003ecb407b41 in start_thread () from /lib64/libpthread.so.0
#3 0x0000003eca8df49d in clone () from /lib64/libc.so.6
(gdb) thread 4
[Switching to thread 4 (Thread 0x7ffff522f700 (LWP 24007))]
#0 GTM::futex_wait (addr=0x7ffff7fdfbb8, val=1) at
../../../gcc-trunk/libitm/config/linux/futex.cc:49
49 if (__builtin_expect (res == -ENOSYS, 0))
(gdb) bt
#0 GTM::futex_wait (addr=0x7ffff7fdfbb8, val=1) at
../../../gcc-trunk/libitm/config/linux/futex.cc:49
#1 0x00007ffff75cd1a4 in GTM::gtm_rwlock::read_lock (this=0x7ffff7fdfbb0,
tx=0x7fffd40008c0)
at ../../../gcc-trunk/libitm/config/linux/rwlock.cc:76
#2 0x00007ffff75ccbfa in GTM::gtm_thread::decide_begin_dispatch
(this=0x7fffd40008c0, prop=<optimized out>)
at ../../../gcc-trunk/libitm/retry.cc:182
#3 0x00007ffff75cc16b in GTM_begin_transaction (prop=41, jb=0x7ffff522edb0) at
../../../gcc-trunk/libitm/beginend.cc:235
#4 0x00007ffff75cd853 in _ITM_beginTransaction () at
../../../gcc-trunk/libitm/config/x86/sjlj.S:74
#5 0x00000000004021ab in work ()
#6 0x000000000040308d in threadWait ()
#7 0x0000003ecb407b41 in start_thread () from /lib64/libpthread.so.0
#8 0x0000003eca8df49d in clone () from /lib64/libc.so.6
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libitm/52526] libitm: stuck in futex_wait
2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
@ 2012-03-08 12:43 ` torvald at gcc dot gnu.org
2012-03-10 17:46 ` torvald at gcc dot gnu.org
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: torvald at gcc dot gnu.org @ 2012-03-08 12:43 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
torvald at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2012-03-08
AssignedTo|unassigned at gcc dot |torvald at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libitm/52526] libitm: stuck in futex_wait
2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
2012-03-08 12:43 ` [Bug libitm/52526] " torvald at gcc dot gnu.org
@ 2012-03-10 17:46 ` torvald at gcc dot gnu.org
2012-03-12 21:30 ` patrick.marlier at gmail dot com
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: torvald at gcc dot gnu.org @ 2012-03-10 17:46 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
--- Comment #1 from torvald at gcc dot gnu.org 2012-03-10 17:46:12 UTC ---
Patrick, I posted a fix to gcc-patches. Please have a look if you can.
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libitm/52526] libitm: stuck in futex_wait
2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
2012-03-08 12:43 ` [Bug libitm/52526] " torvald at gcc dot gnu.org
2012-03-10 17:46 ` torvald at gcc dot gnu.org
@ 2012-03-12 21:30 ` patrick.marlier at gmail dot com
2012-03-13 22:04 ` torvald at gcc dot gnu.org
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: patrick.marlier at gmail dot com @ 2012-03-12 21:30 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
--- Comment #2 from Patrick Marlier <patrick.marlier at gmail dot com> 2012-03-12 21:29:30 UTC ---
Indeed, with your proposed patch, it fixes the problem. Thanks!
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libitm/52526] libitm: stuck in futex_wait
2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
` (2 preceding siblings ...)
2012-03-12 21:30 ` patrick.marlier at gmail dot com
@ 2012-03-13 22:04 ` torvald at gcc dot gnu.org
2012-03-13 22:13 ` torvald at gcc dot gnu.org
2012-03-13 22:14 ` torvald at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: torvald at gcc dot gnu.org @ 2012-03-13 22:04 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
--- Comment #3 from torvald at gcc dot gnu.org 2012-03-13 22:01:41 UTC ---
Author: torvald
Date: Tue Mar 13 22:01:34 2012
New Revision: 185358
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185358
Log:
libitm: Fix lost wake-up in serial lock.
PR libitm/52526
* config/linux/rwlock.cc (GTM::gtm_rwlock::read_lock): Fix lost
wake-up.
Modified:
trunk/libitm/ChangeLog
trunk/libitm/config/linux/rwlock.cc
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libitm/52526] libitm: stuck in futex_wait
2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
` (3 preceding siblings ...)
2012-03-13 22:04 ` torvald at gcc dot gnu.org
@ 2012-03-13 22:13 ` torvald at gcc dot gnu.org
2012-03-13 22:14 ` torvald at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: torvald at gcc dot gnu.org @ 2012-03-13 22:13 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
--- Comment #4 from torvald at gcc dot gnu.org 2012-03-13 22:11:52 UTC ---
Author: torvald
Date: Tue Mar 13 22:11:46 2012
New Revision: 185360
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185360
Log:
libitm: Fix lost wake-up in serial lock.
PR libitm/52526
Backported from mainline.
* config/linux/rwlock.cc (GTM::gtm_rwlock::read_lock): Fix lost
wake-up.
Modified:
branches/gcc-4_7-branch/libitm/ChangeLog
branches/gcc-4_7-branch/libitm/config/linux/rwlock.cc
^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug libitm/52526] libitm: stuck in futex_wait
2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
` (4 preceding siblings ...)
2012-03-13 22:13 ` torvald at gcc dot gnu.org
@ 2012-03-13 22:14 ` torvald at gcc dot gnu.org
5 siblings, 0 replies; 7+ messages in thread
From: torvald at gcc dot gnu.org @ 2012-03-13 22:14 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52526
torvald at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
--- Comment #5 from torvald at gcc dot gnu.org 2012-03-13 22:13:16 UTC ---
Fixed in both trunk and 4.7.
^ permalink raw reply [flat|nested] 7+ messages in thread
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2012-03-07 22:41 [Bug libitm/52526] New: libitm: stuck in futex_wait patrick.marlier at gmail dot com
2012-03-08 12:43 ` [Bug libitm/52526] " torvald at gcc dot gnu.org
2012-03-10 17:46 ` torvald at gcc dot gnu.org
2012-03-12 21:30 ` patrick.marlier at gmail dot com
2012-03-13 22:04 ` torvald at gcc dot gnu.org
2012-03-13 22:13 ` torvald at gcc dot gnu.org
2012-03-13 22:14 ` torvald at gcc dot gnu.org
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