]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
futex: avoid race between requeue and wake
authorLinus Torvalds <torvalds@linux-foundation.org>
Tue, 8 Apr 2014 22:30:07 +0000 (15:30 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 9 Apr 2014 15:02:12 +0000 (08:02 -0700)
commit69cd9eba38867a493a043bb13eb9b33cad5f1a9a
treefec2fee0f3fc0c67d00dd07836b70fb230c11aac
parent75ff24fa52f0cc512ceee4c377632b91a3a80811
futex: avoid race between requeue and wake

Jan Stancek reported:
 "pthread_cond_broadcast/4-1.c testcase from openposix testsuite (LTP)
  occasionally fails, because some threads fail to wake up.

  Testcase creates 5 threads, which are all waiting on same condition.
  Main thread then calls pthread_cond_broadcast() without holding mutex,
  which calls:

      futex(uaddr1, FUTEX_CMP_REQUEUE_PRIVATE, 1, 2147483647, uaddr2, ..)

  This immediately wakes up single thread A, which unlocks mutex and
  tries to wake up another thread:

      futex(uaddr2, FUTEX_WAKE_PRIVATE, 1)

  If thread A manages to call futex_wake() before any waiters are
  requeued for uaddr2, no other thread is woken up"

The ordering constraints for the hash bucket waiter counting are that
the waiter counts have to be incremented _before_ getting the spinlock
(because the spinlock acts as part of the memory barrier), but the
"requeue" operation didn't honor those rules, and nobody had even
thought about that case.

This fairly simple patch just increments the waiter count for the target
hash bucket (hb2) when requeing a futex before taking the locks.  It
then decrements them again after releasing the lock - the code that
actually moves the futex(es) between hash buckets will do the additional
required waiter count housekeeping.

Reported-and-tested-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org # 3.14
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/futex.c