Hi,
On 07/31/2016 07:54 AM, shli@xxxxxxxxxx wrote:
From: Shaohua Li <shli@xxxxxx>
md-cluster receive thread calls .quiesce too, let it hold mddev lock.
I'd suggest hold on for the patchset, I can find lock problem easily with
the patchset applied. Take a resyncing clusteed raid1 as example.
md127_raid1 thread held reconfig_mutex then update sb, so it needs dlm
token lock. Meanwhile md127_resync thread got token lock and wants
EX on ack lock but recv_daemon can't release ack lock since recv_daemon
doesn't get reconfig_mutex.
etalinux135:~ # ps aux|grep md|grep D
root 2028 0.0 0.0 0 0 ? D 16:24 0:00
[md127_raid1]
root 2041 0.0 0.0 0 0 ? D 16:24 0:00
[md127_resync]
betalinux135:~ # cat /proc/2028/stack
[<ffffffffa05f2660>] metadata_update_start+0xa0/0xb0 [md_cluster]
[<ffffffffa06cb1ce>] md_update_sb.part.50+0x8e/0x810 [md_mod]
[<ffffffffa06ccb8c>] md_check_recovery+0x23c/0x4f0 [md_mod]
[<ffffffffa06f6312>] raid1d+0x42/0x7d0 [raid1]
[<ffffffffa06c6d10>] md_thread+0x130/0x150 [md_mod]
[<ffffffff810995ed>] kthread+0xbd/0xe0
[<ffffffff815e96bf>] ret_from_fork+0x3f/0x70
[<ffffffff81099530>] kthread+0x0/0xe0
[<ffffffffffffffff>] 0xffffffffffffffff
betalinux135:~ # cat /proc/2041/stack
[<ffffffffa05f24cb>] dlm_lock_sync+0x6b/0x80 [md_cluster]
[<ffffffffa05f2708>] __sendmsg+0x98/0x130 [md_cluster]
[<ffffffffa05f282d>] sendmsg+0x1d/0x30 [md_cluster]
[<ffffffffa05f2b31>] resync_info_update+0x81/0xb0 [md_cluster]
[<ffffffffa06f3ad7>] sync_request+0xa57/0xaf0 [raid1]
[<ffffffffa06ca2dd>] md_do_sync+0x90d/0xe80 [md_mod]
[<ffffffffa06c6d10>] md_thread+0x130/0x150 [md_mod]
[<ffffffff810995ed>] kthread+0xbd/0xe0
[<ffffffff815e96bf>] ret_from_fork+0x3f/0x70
[<ffffffff81099530>] kthread+0x0/0xe0
[<ffffffffffffffff>] 0xffffffffffffffff
Thanks,
Guoqing
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