On Tue, Oct 09, 2012 at 04:12:54PM +0200, Olivier Bonvalet wrote: > What I didn't understand, is that since 24 hours, there was near 0 IO > request done on that device. The cleanup processes was just «frozen», not > doing anything visible (no CPU and no IO) ; like a deadlock. Yep, it was a deadlock and I've found Roman's report against 3.6-rc5 that has the same symptoms: http://www.mail-archive.com/linux-btrfs@xxxxxxxxxxxxxxx/msg18658.html The blocked threads are transaction-commit, cleaner and the generic writeback flusher, it's not the deadlock on s_umount mutex but inside the tree locks, and still unresolved. david -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
