TO: Thomas Gleixner <t...@linutronix.de>
tree: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git locking/urgent
head: 27e35715df54cbc4f2d044f681802ae30479e7fb
commit: 27e35715df54cbc4f2d044f681802ae30479e7fb [3/3] rtmutex: Plug slow
unlock race
:::::: branch date: 46 minutes ago
:::::: commit date: 46 minutes ago
kernel/locking/rtmutex.c:1033 rt_mutex_slowunlock() error: double lock
'spin_lock:&lock->wait_lock'
kernel/locking/rtmutex.c:1045 rt_mutex_slowunlock() warn: inconsistent returns
spin_lock:&lock->wait_lock: locked (1031) unlocked (1045)
git remote add tip git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
git remote update tip
git checkout 27e35715df54cbc4f2d044f681802ae30479e7fb
vim +1033 kernel/locking/rtmutex.c
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1025 *
lock->owner = NULL;
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1026 *
raw_spin_unlock(&lock->wait_lock);
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1027 */
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1028 while
(!rt_mutex_has_waiters(lock)) {
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1029
/* Drops lock->wait_lock ! */
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1030
if (unlock_rt_mutex_safe(lock) == true)
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 @1031
return;
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1032
/* Relock the rtmutex and try again */
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 @1033
raw_spin_lock(&lock->wait_lock);
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1034 }
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1035
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1036 /*
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1037 * The
wakeup next waiter path does not suffer from the above
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1038 *
race. See the comments there.
27e35715 kernel/locking/rtmutex.c Thomas Gleixner 2014-06-11 1039 */
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1040
wakeup_next_waiter(lock);
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1041
d209d74d kernel/rtmutex.c Thomas Gleixner 2009-11-17 1042
raw_spin_unlock(&lock->wait_lock);
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1043
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1044 /* Undo
pi boosting if necessary: */
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 @1045
rt_mutex_adjust_prio(current);
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1046 }
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1047
23f78d4a kernel/rtmutex.c Ingo Molnar 2006-06-27 1048 /*
---
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