3.13.11.10 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Catalin Marinas <catalin.mari...@arm.com>
commit 76835b0ebf8a7fe85beb03c75121419a7dec52f0 upstream.
Commit b0c29f79ecea (futexes: Avoid taking the hb->lock if there's
nothing to wake up) changes the futex code to avoid taking a lock when
there are no waiters. This code has been subsequently fixed in commit
11d4616bd07f (futex: revert back to the explicit waiter counting code).
Both the original commit and the fix-up rely on get_futex_key_refs() to
always imply a barrier.
However, for private futexes, none of the cases in the switch statement
of get_futex_key_refs() would be hit and the function completes without
a memory barrier as required before checking the "waiters" in
futex_wake() -> hb_waiters_pending(). The consequence is a race with a
thread waiting on a futex on another CPU, allowing the waker thread to
read "waiters == 0" while the waiter thread to have read "futex_val ==
locked" (in kernel).
Without this fix, the problem (user space deadlocks) can be seen with
Android bionic's mutex implementation on an arm64 multi-cluster system.
Signed-off-by: Catalin Marinas <catalin.mari...@arm.com>
Reported-by: Matteo Franchin <matteo.franc...@arm.com>
Fixes: b0c29f79ecea (futexes: Avoid taking the hb->lock if there's nothing to
wake up)
Acked-by: Davidlohr Bueso <d...@stgolabs.net>
Tested-by: Mike Galbraith <umgwanakikb...@gmail.com>
Cc: Darren Hart <dvh...@linux.intel.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
kernel/futex.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/kernel/futex.c b/kernel/futex.c
index 4741b1f..2b1583e 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -194,6 +194,8 @@ static void get_futex_key_refs(union futex_key *key)
case FUT_OFF_MMSHARED:
atomic_inc(&key->private.mm->mm_count);
break;
+ default:
+ smp_mb(); /* explicit MB (B) */
}
}
--
1.9.1
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