Hi Please apply this before 3.19 is released.
Mikulas The patch e22b886a8a43b147e1994a9f970f678fc0df2033 introduced a bug in the raid5 subsystem. The function raid5_quiesce (and resize_stripes) calls lock_all_device_hash_locks_irq that disables interrupts and takes a few spinlocks, then it calls wait_event_cmd with cmd1 unlock_all_device_hash_locks_irq(conf) and cmd2 lock_all_device_hash_locks_irq(conf). cmd1 unlocks the spinlocks and enables interrupts, cmd2 disables interrupts and locks the spinlock. The patch e22b886a8a43b147e1994a9f970f678fc0df2033 adds might_sleep() to a position where spinlocks are taken, thus it introduces a bug. This patch removes might_sleep() from wait_event_cmd. Signed-off-by: Mikulas Patocka <mpato...@redhat.com> --- include/linux/wait.h | 1 - 1 file changed, 1 deletion(-) Index: linux-2.6/include/linux/wait.h =================================================================== --- linux-2.6.orig/include/linux/wait.h 2014-12-30 01:19:25.564231262 +0100 +++ linux-2.6/include/linux/wait.h 2015-02-02 15:30:16.766354658 +0100 @@ -363,7 +363,6 @@ do { \ */ #define wait_event_cmd(wq, condition, cmd1, cmd2) \ do { \ - might_sleep(); \ if (condition) \ break; \ __wait_event_cmd(wq, condition, cmd1, cmd2); \ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/