On Thu, Jul 28, 2016 at 02:06:08PM -0700, Andrew Morton wrote:
> From: piaojun <piao...@huawei.com>
> Subject: ocfs2/dlm: continue to purge recovery lockres when recovery master
> goes down
>
> We found a dlm-blocked situation caused by continuous breakdown of
> recovery masters described below. To solve this problem, we should purge
> recovery lock once detecting recovery master goes down.
>
> N3 N2 N1(reco master)
> go down
> pick up recovery lock and
> begin recoverying for N2
>
> go down
>
> pick up recovery
> lock failed, then
> purge it:
> dlm_purge_lockres
> ->DROPPING_REF is set
>
> send deref to N1 failed,
> recovery lock is not purged
>
> find N1 go down, begin
> recoverying for N1, but
> blocked in dlm_do_recovery
> as DROPPING_REF is set:
> dlm_do_recovery
> ->dlm_pick_recovery_master
> ->dlmlock
> ->dlm_get_lock_resource
> ->__dlm_wait_on_lockres_flags(tmpres,
> DLM_LOCK_RES_DROPPING_REF);
>
> Fixes: 8c0343968163 ("ocfs2/dlm: clear DROPPING_REF flag when the master goes
> down")
> Link: http://lkml.kernel.org/r/578453af.8030...@huawei.com
> Signed-off-by: Jun Piao <piao...@huawei.com>
> Reviewed-by: Joseph Qi <joseph...@huawei.com>
> Reviewed-by: Jiufei Xue <xuejiu...@huawei.com>
Reviewed-by: Mark Fasheh <mfas...@suse.de>
--Mark
--
Mark Fasheh
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