Waiman Long 39e7234f00 locking/rwsem: Fix kernel crash when spinning on RWSEM_OWNER_UNKNOWN ...

The commit 91d2a812dfb9 ("locking/rwsem: Make handoff writer
optimistically spin on owner") will allow a recently woken up waiting
writer to spin on the owner. Unfortunately, if the owner happens to be
RWSEM_OWNER_UNKNOWN, the code will incorrectly spin on it leading to a
kernel crash. This is fixed by passing the proper non-spinnable bits
to rwsem_spin_on_owner() so that RWSEM_OWNER_UNKNOWN will be treated
as a non-spinnable target.

Fixes: 91d2a812dfb9 ("locking/rwsem: Make handoff writer optimistically spin on owner")

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200115154336.8679-1-longman@redhat.com

2020-01-17 10:19:27 +01:00

..

lock_events_list.h

locking/rwsem: Adaptive disabling of reader optimistic spinning

2019-06-17 12:28:09 +02:00

lock_events.c

locking/lock_events: Don't show pvqspinlock events on bare metal

2019-04-10 10:56:05 +02:00

lock_events.h

locking/lock_events: Use raw_cpu_{add,inc}() for stats

2019-06-03 12:32:56 +02:00

lockdep_internals.h

locking/lockdep: Report more stack trace statistics

2019-07-25 15:43:28 +02:00

lockdep_proc.c

locking/lockdep: Report more stack trace statistics

2019-07-25 15:43:28 +02:00

lockdep_states.h

locking/lockdep: Rework FS_RECLAIM annotation

2017-08-10 12:29:03 +02:00

lockdep.c

locking/lockdep: Fix buffer overrun problem in stack_trace[]

2019-12-25 10:42:32 +01:00

locktorture.c

locking: locktorture: Do not include rwlock.h directly

2019-10-05 11:50:24 -07:00

Makefile

locking/rwsem: Merge rwsem.h and rwsem-xadd.c into rwsem.c

2019-06-17 12:27:57 +02:00

mcs_spinlock.h

locking/mcs: Use smp_cond_load_acquire() in MCS spin loop

2018-04-27 09:48:49 +02:00

mutex-debug.c

locking/mutex: Replace spin_is_locked() with lockdep

2018-11-12 09:06:22 -08:00

mutex-debug.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

mutex.c

Revert "locking/mutex: Complain upon mutex API misuse in IRQ contexts"

2019-12-11 00:27:43 +01:00

mutex.h

mutex: Fix up mutex_waiter usage

2019-08-08 09:09:25 +02:00

osq_lock.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

percpu-rwsem.c

Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

2019-06-28 19:46:47 +02:00

qrwlock.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

2019-05-30 11:26:37 -07:00

qspinlock_paravirt.h

Revert "locking/pvqspinlock: Don't wait if vCPU is preempted"

2019-09-25 10:22:37 +02:00

qspinlock_stat.h

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

2019-05-30 11:26:37 -07:00

qspinlock.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157

2019-05-30 11:26:37 -07:00

rtmutex_common.h

locking/rtmutex: Handle non enqueued waiters gracefully in remove_waiter()

2018-03-28 23:01:30 +02:00

rtmutex-debug.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rtmutex-debug.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rtmutex.c

locking/lockdep: Remove unused @nested argument from lock_release()

2019-10-09 12:46:10 +02:00

rtmutex.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rwsem.c

locking/rwsem: Fix kernel crash when spinning on RWSEM_OWNER_UNKNOWN

2020-01-17 10:19:27 +01:00

rwsem.h

locking/rwsem: Merge rwsem.h and rwsem-xadd.c into rwsem.c

2019-06-17 12:27:57 +02:00

semaphore.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 436

2019-06-05 17:37:17 +02:00

spinlock_debug.c

locking/spinlock/debug: Fix various data races

2019-11-29 08:03:27 +01:00

spinlock.c

asm-generic/mmiowb: Add generic implementation of mmiowb() tracking

2019-04-08 11:59:39 +01:00

test-ww_mutex.c

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 9

2019-05-21 11:28:40 +02:00