3.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: majianpeng <majianpeng@xxxxxxxxx> commit ad4068de49862b083ac2a15bc50689bb30ce3e44 upstream. When release_stripe() is called in grow_one_stripe(), the mddev->thread is null. So it will omit one wakeup this thread to release stripe. For this condition, use slow_path to release stripe. Bug was introduced in 3.12 Fixes: 773ca82fa1ee58dd1bf88b Signed-off-by: Jianpeng Ma <majianpeng@xxxxxxxxx> Signed-off-by: NeilBrown <neilb@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/md/raid5.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -340,7 +340,8 @@ static void release_stripe(struct stripe unsigned long flags; bool wakeup; - if (test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) + if (unlikely(!conf->mddev->thread) || + test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state)) goto slow_path; wakeup = llist_add(&sh->release_list, &conf->released_stripes); if (wakeup) -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html