Niklas Cassel 17fcbd590d locking/rwsem: Fix down_write_killable() for CONFIG_RWSEM_GENERIC_SPINLOCK=y ...

We hang if SIGKILL has been sent, but the task is stuck in down_read()
(after do_exit()), even though no task is doing down_write() on the
rwsem in question:

  INFO: task libupnp:21868 blocked for more than 120 seconds.
  libupnp         D    0 21868      1 0x08100008
  ...
  Call Trace:
  __schedule()
  schedule()
  __down_read()
  do_exit()
  do_group_exit()
  __wake_up_parent()

This bug has already been fixed for CONFIG_RWSEM_XCHGADD_ALGORITHM=y in
the following commit:

 04cafed7fc ("locking/rwsem: Fix down_write_killable()")

... however, this bug also exists for CONFIG_RWSEM_GENERIC_SPINLOCK=y.

Signed-off-by: Niklas Cassel <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Niklas Cassel <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Fixes: d47996082f ("locking/rwsem: Introduce basis for down_write_killable()")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

2017-03-16 09:28:30 +01:00

..

lockdep_internals.h

lockdep: Limit static allocations if PROVE_LOCKING_SMALL is defined

2016-11-18 11:33:19 -08:00

lockdep_proc.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

lockdep_states.h

…

lockdep.c

Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2017-03-07 14:33:11 -08:00

locktorture.c

sched/headers: Prepare for the removal of <linux/rtmutex.h> from <linux/sched.h>

2017-03-02 08:42:32 +01:00

Makefile

locking/ww_mutex: Begin kselftests for ww_mutex

2017-01-14 11:37:14 +01:00

mcs_spinlock.h

locking/core: Remove cpu_relax_lowlatency() users

2016-11-16 10:15:10 +01:00

mutex-debug.c

locking/mutex: Rework mutex::owner

2016-10-25 11:31:50 +02:00

mutex-debug.h

locking/mutex: Fix lockdep_assert_held() fail

2017-01-30 11:42:59 +01:00

mutex.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

mutex.h

locking/mutex: Fix lockdep_assert_held() fail

2017-01-30 11:42:59 +01:00

osq_lock.c

locking/osq: Break out of spin-wait busy waiting loop for a preempted vCPU in osq_lock()

2016-11-22 12:48:10 +01:00

percpu-rwsem.c

locking/percpu-rwsem: Replace waitqueue with rcuwait

2017-01-14 11:14:35 +01:00

qrwlock.c

locking/core: Remove cpu_relax_lowlatency() users

2016-11-16 10:15:10 +01:00

qspinlock_paravirt.h

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

2017-01-12 09:35:57 +01:00

qspinlock_stat.h

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/clock.h>

2017-03-02 08:42:27 +01:00

qspinlock.c

locking/qspinlock: Use __this_cpu_dec() instead of full-blown this_cpu_dec()

2016-06-27 11:37:41 +02:00

rtmutex_common.h

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/wake_q.h>

2017-03-02 08:42:26 +01:00

rtmutex-debug.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

rtmutex-debug.h

…

rtmutex.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

rtmutex.h

…

rwsem-spinlock.c

locking/rwsem: Fix down_write_killable() for CONFIG_RWSEM_GENERIC_SPINLOCK=y

2017-03-16 09:28:30 +01:00

rwsem-xadd.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

rwsem.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

rwsem.h

locking/rwsem: Protect all writes to owner by WRITE_ONCE()

2016-06-08 15:16:59 +02:00

semaphore.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h>

2017-03-02 08:42:34 +01:00

spinlock_debug.c

locking/spinlock/debug: Remove spinlock lockup detection code

2017-02-10 09:09:49 +01:00

spinlock.c

locking/spinlocks: Remove the unused spin_lock_bh_nested() API

2017-01-12 09:33:39 +01:00

test-ww_mutex.c

locking/ww_mutex: Adjust the lock number for stress test

2017-03-02 09:00:39 +01:00