> >> The following patch fixes the deadlock. When the quota subsystem takes s_umount, > >> it checks if the filesystem is frozen. If it is, we drop s_umount, wait for > >> the filesystem to resume and retry. > > Thanks for the patch. I'm aware of the deadlock and Val Henson is working > > on resolving these types of deadlocks more systematically. But since I > > haven't heard from her for a while, I guess I'll merge your fix and she'll > > update her series to reflect your change since those patches are going to > > go in at earliest in the next merge window. > > To sum up: I've merged your patch. > > FYI, I no longer have time to consult in addition to my full-time job. > Canonical is taking over this patch set. > > -VAL Hi Where can I get that patch set? We are experiencing other similar deadlocks on RHEL-6, caused by sync or background writeback (these code paths take s_umount and wait trying to do I/O), but I wasn't able to reproduce these deadlocks on upstream kernel? Are there other known deadlock possibilities? Mikulas
