[DRBD-user] drbdadm down failed (-12) - blocked by drbd_submit

[Radoslaw Garbacz]

Thanks, will take a closer look at this.

On Thu, Oct 11, 2018 at 3:47 AM, Lars Ellenberg <lars.ellenberg at linbit.com>
wrote:

> On Tue, Oct 02, 2018 at 12:56:38PM -0500, Radoslaw Garbacz wrote:
> > Hi,
> >
> >
> > I have a problem, which (from what I found) has been discussed, however
> not
> > in the particular case, which I experienced, so I would be grateful for
> any
> > suggestions of how to deal with it.
> >
> >
> > I.
> > 1. I get an error when demoting DRBD resource:
> > * drbdadm down data0
> >
> > data0: State change failed: (-12) Device is held open by someone
> > additional info from kernel:
> > failed to demote
> > Command 'drbdsetup-84 down data0' terminated with exit code 11
> >
> > 2. The device is not mounted and not used by any LVM, so based on some
> > online discussions I checked the blocking process and it is
> "drbd0_submit"
> >
> > * lsof | grep drbd0
> > drbd0_sub 16687         root  cwd       DIR              202,1 251 64 /
>
> No, it is not.
>
> drbd*submitter (only 16 bytes of that name actually make it into the
> comm part of the task struct, which is what ps or lsof or the like can
> display) are kernel threads, and part of DRBD operations.
> They are certainly NOT "holding it open".
> They are a required part of its existence.
>
> "Holding it open" when you think you already unmounted it
> is typically either some forgotten device mapper thingy
> (semi-automatically created by kpartx e.g.),
> or some racy "udev triggered probe".
>
> In the latter case, if you retry after a couple seconds,
> demoting should work.
>
> > Is there a good way to deal with this case, as whether some DRBD step is
> > missing, which leaves the process or killing the process is the right
> way?
>
> Again, that "process" has nothing to do with drbd being "held open",
> but is a kernel thread that is part of the existence of that DRBD volume.
>
> --
> : Lars Ellenberg
> : LINBIT | Keeping the Digital World Running
> : DRBD -- Heartbeat -- Corosync -- Pacemaker
>
> DRBD® and LINBIT® are registered trademarks of LINBIT
> __
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-- 
Best Regards,

Radoslaw Garbacz
XtremeData Incorporated
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