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NFSv4.1: Fix a race where CB_NOTIFY_LOCK fails to wake a waiter

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nfs4_retry_setlk() sets the task's state to TASK_INTERRUPTIBLE within the
same region protected by the wait_queue's lock after checking for a
notification from CB_NOTIFY_LOCK callback.  However, after releasing that
lock, a wakeup for that task may race in before the call to
freezable_schedule_timeout_interruptible() and set TASK_WAKING, then
freezable_schedule_timeout_interruptible() will set the state back to
TASK_INTERRUPTIBLE before the task will sleep.  The result is that the task
will sleep for the entire duration of the timeout.

Since we've already set TASK_INTERRUPTIBLE in the locked section, just use
freezable_schedule_timout() instead.

Fixes: a1d617d8f1 ("nfs: allow blocking locks to be awoken by lock callbacks")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Cc: stable@vger.kernel.org # v4.9+
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Benjamin Coddington 2017-07-28 12:33:54 -04:00 committed by Anna Schumaker
parent 6ba80d4348
commit b7dbcc0e43
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/nfs4proc.c
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@ -6495,7 +6495,7 @@ nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
set_current_state(TASK_INTERRUPTIBLE);
spin_unlock_irqrestore(&q->lock, flags);
freezable_schedule_timeout_interruptible(NFS4_LOCK_MAXTIMEOUT);
freezable_schedule_timeout(NFS4_LOCK_MAXTIMEOUT);
}
finish_wait(q, &wait);