> Message: 1
> Date: Fri, 12 Jan 2018 06:15:01 +0000
> From: Shichangkuo <shi.chang...@h3c.com>
> Subject: Re: [Ocfs2-devel] [Ocfs2-dev] BUG: deadlock with umount and
> ocfs2 workqueue triggered by ocfs2rec thread
> To: Joseph Qi <jiangqi...@gmail.com>, "z...@suse.com" <z...@suse.com>,
> "j...@suse.cz" <j...@suse.cz>
> Cc: "ocfs2-devel@oss.oracle.com" <ocfs2-devel@oss.oracle.com>
> Message-ID:
> <d1e4d02760513d4b90dc3b40ff32af35e22ec...@h3cmlb14-ex.srv.huawe
> i-3com.com>
>
> Content-Type: text/plain; charset="gb2312"
>
> Hi Joseph
> Thanks for replying.
> Umount will flush the ocfs2 workqueue in function
> ocfs2_truncate_log_shutdown and journal recovery is one work of ocfs2 wq.
>
> Thanks
> Changkuo
>
Umount
mngput
cleanup_mnt
deactivate_super: down_write the rw_semaphore:
down_write(&s->s_umount)
deactivate_locked_super
kill_sb: kill_block_super
generic_shutdown_super
put_super : ocfs2_put_supe
ocfs2_dismount_volume
ocfs2_truncate_log_shutdown
flush_workqueue(osb->ocfs2_wq);
ocfs2_finish_quota_recovery
down_read(&sb->s_umount);
Here
retry down_read rw_semaphore; down read while holding write? Try rw_semaphore
twice, dead lock ?
The flush work queue of ocfs2_wq will
be blocked, so as the umount ops.
Thanks.
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