Messages in this thread | | | Date | Wed, 4 Nov 2009 08:41:37 +0100 | From | Jens Axboe <> | Subject | Re: 2.6.32-rc4ish: task umount blocked for more than 120 seconds after USB drive removal |
| |
On Tue, Nov 03 2009, Andrew Morton wrote: > On Tue, 20 Oct 2009 23:26:17 -0600 > Robert Hancock <hancockrwd@gmail.com> wrote: > > > Running a post-2.6.32-rc4 git kernel, and just unmounted a USB drive > > after writing a bunch of data to it, then pulled the plug after I > > thought it had finished unmounting, but apparently it hadn't.. Ran into > > a hung task warning that repeats every 120 seconds, the umount command > > for the drive is stuck in D state. > > > > The full SysRq-T output is shown at the bottom.. any ideas what it's > > waiting for? > > At a guess I'd say the new per-bdi writeback stuff blew up. Is this > still happening in current mainline?
It happens in -rc6, it should be fixed in current -git. Robert, can you try and confirm?
> It's remarkable how much harder these traces are to read post-wordwrapping.
Indeed, I always copy into a new buffer and un-wrap them :/
-- Jens Axboe
| |