On Thu, May 05, 2011 at 02:10:39PM +0200, Jan Kara wrote: > In do_get_write_access() we wait on BH_Unshadow bit for buffer to get > from shadow state. The waking code in journal_commit_transaction() has > a bug because it does not issue a memory barrier after the buffer is moved > from the shadow state and before wake_up_bit() is called. Thus a waitqueue > check can happen before the buffer is actually moved from the shadow state > and waiting process may never be woken. Fix the problem by issuing proper > barrier. > > Reported-by: Tao Ma <boyu.mt@xxxxxxxxxx> > Signed-off-by: Jan Kara <jack@xxxxxxx> Thanks, I've added this to the ext4 tree. (Currently in the dev branch, pending testing.) - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
