Niklas Cassel c406096522 locking/rwsem: Fix down_write_killable() for CONFIG_RWSEM_GENERIC_SPINLOCK=y ...

commit 17fcbd590d upstream.

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 <niklas.cassel@axis.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: <mhocko@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Niklas Cassel <niklass@axis.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d47996082f ("locking/rwsem: Introduce basis for down_write_killable()")
Link: http://lkml.kernel.org/r/1487981873-12649-1-git-send-email-niklass@axis.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-03-22 12:43:40 +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

lockdep: Fix lock_chain::base size

2016-04-23 13:53:03 +02:00

lockdep_states.h

locking: Move the lockdep code to kernel/locking/

2013-11-06 07:55:08 +01:00

lockdep.c

lockdep: Fix report formatting

2016-12-06 10:40:08 +01:00

locktorture.c

lcoking/locktorture: Simplify the torture_runnable computation

2016-04-28 10:57:51 +02:00

Makefile

locking/lglock: Remove lglock implementation

2016-09-22 15:25:56 +02:00

mcs_spinlock.h

locking/mcs: Fix mcs_spin_lock() ordering

2016-02-29 10:02:41 +01:00

mutex-debug.c

locking: avoid passing around 'thread_info' in mutex debugging code

2016-06-23 12:11:17 -07:00

mutex-debug.h

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

2016-07-25 12:41:29 -07:00

mutex.c

locking: avoid passing around 'thread_info' in mutex debugging code

2016-06-23 12:11:17 -07:00

mutex.h

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

2016-07-25 12:41:29 -07:00

osq_lock.c

locking/osq: Fix ordering of node initialisation in osq_lock

2015-12-17 11:40:29 -08:00

percpu-rwsem.c

locking/percpu-rwsem: Optimize readers and reduce global impact

2016-08-10 14:34:01 +02:00

qrwlock.c

locking/atomic, arch/qrwlock: Employ atomic_fetch_add_acquire()

2016-06-16 10:48:34 +02:00

qspinlock_paravirt.h

locking/pv-qspinlock: Use cmpxchg_release() in __pv_queued_spin_unlock()

2016-09-22 15:25:51 +02:00

qspinlock_stat.h

locking/pvstat: Separate wait_again and spurious wakeup stats

2016-08-10 14:16:02 +02:00

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

locking/rtmutex: Use READ_ONCE() in rt_mutex_owner()

2016-12-02 11:13:26 +01:00

rtmutex-debug.c

rtmutex: Cleanup deadlock detector debug logic

2014-06-21 22:05:30 +02:00

rtmutex-debug.h

rtmutex: Cleanup deadlock detector debug logic

2014-06-21 22:05:30 +02:00

rtmutex.c

locking/rtmutex: Prevent dequeue vs. unlock race

2016-12-02 11:13:26 +01:00

rtmutex.h

rtmutex: Cleanup deadlock detector debug logic

2014-06-21 22:05:30 +02:00

rwsem-spinlock.c

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

2017-03-22 12:43:40 +01:00

rwsem-xadd.c

locking/rwsem: Scan the wait_list for readers only once

2016-08-18 15:37:11 +02:00

rwsem.c

locking/rwsem: Add reader-owned state to the owner field

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

rwsem.h

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

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

semaphore.c

locking/semaphore: Resolve some shadow warnings

2014-09-04 07:17:24 +02:00

spinlock_debug.c

locking: Move the spinlock code to kernel/locking/

2013-11-06 07:55:21 +01:00

spinlock.c

spinlock: Add spin_lock_bh_nested()

2015-01-03 14:32:57 -05:00