On Mon, Aug 01, 2011 at 07:47:49AM +0800, Dave Chinner wrote: > On Sun, Jul 31, 2011 at 11:10:14PM +0800, Wu Fengguang wrote: > > On Sat, Jul 30, 2011 at 09:44:22PM +0800, Christoph Hellwig wrote: > > > This patch fixes the hang for me. > > > > Thanks. It'd be better to get the _simple and tested_ fix into 3.1-rc1. > > (if anyone find major problems with the fix, please speak up) > > Yes, I already have, a couple of hours before you sent this: > > http://www.spinics.net/lists/linux-fsdevel/msg47357.html Err I found it in my spam folder.. and added you to the white list :) > We haven't found the root cause of the problem, and writeback cannot > hold off grab_super_passive() because writeback only holds read > locks on s_umount, just like grab_super_passive. So if > grab_super_passive is failing, there is some other, not yet > unidentified actor causing this problem.... Yeah sorry, I totally overlooked the read lock. Since Linus has pointed out the possibility of read-write-read deadlock, I'll jump to your more recent email for the root cause. Thanks, Fengguang -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
