From: Xiubo Li <xiubli@xxxxxxxxxx> The call trace: <6>[15981.740583] libceph: mon2 (1)10.72.36.245:40083 session lost, hunting for new mon <3>[16097.960293] INFO: task kworker/18:1:32111 blocked for more than 122 seconds. <3>[16097.960860] Tainted: G E 5.7.0-rc5+ #80 <3>[16097.961332] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. <6>[16097.961868] kworker/18:1 D 0 32111 2 0x80004080 <6>[16097.962151] Workqueue: ceph-msgr ceph_con_workfn [libceph] <4>[16097.962188] Call Trace: <4>[16097.962353] ? __schedule+0x276/0x6e0 <4>[16097.962359] ? schedule+0x40/0xb0 <4>[16097.962364] ? schedule_preempt_disabled+0xa/0x10 <4>[16097.962368] ? __mutex_lock.isra.8+0x2b5/0x4a0 <4>[16097.962460] ? kick_requests+0x21/0x100 [ceph] <4>[16097.962485] ? ceph_mdsc_handle_mdsmap+0x19c/0x5f0 [ceph] <4>[16097.962503] ? extra_mon_dispatch+0x34/0x40 [ceph] <4>[16097.962523] ? extra_mon_dispatch+0x34/0x40 [ceph] <4>[16097.962580] ? dispatch+0x77/0x930 [libceph] <4>[16097.962602] ? try_read+0x78b/0x11e0 [libceph] <4>[16097.962619] ? __switch_to_asm+0x40/0x70 <4>[16097.962623] ? __switch_to_asm+0x34/0x70 <4>[16097.962627] ? __switch_to_asm+0x40/0x70 <4>[16097.962631] ? __switch_to_asm+0x34/0x70 <4>[16097.962635] ? __switch_to_asm+0x40/0x70 <4>[16097.962654] ? ceph_con_workfn+0x130/0x5e0 [libceph] <4>[16097.962713] ? process_one_work+0x1ad/0x370 <4>[16097.962717] ? worker_thread+0x30/0x390 <4>[16097.962722] ? create_worker+0x1a0/0x1a0 <4>[16097.962737] ? kthread+0x112/0x130 <4>[16097.962742] ? kthread_park+0x80/0x80 <4>[16097.962747] ? ret_from_fork+0x35/0x40 <3>[16097.962758] INFO: task kworker/25:1:1747 blocked for more than 122 seconds. <3>[16097.963233] Tainted: G E 5.7.0-rc5+ #80 <3>[16097.963792] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. <6>[16097.964298] kworker/25:1 D 0 1747 2 0x80004080 <6>[16097.964325] Workqueue: ceph-msgr ceph_con_workfn [libceph] <4>[16097.964331] Call Trace: <4>[16097.964340] ? __schedule+0x276/0x6e0 <4>[16097.964344] ? schedule+0x40/0xb0 <4>[16097.964347] ? schedule_preempt_disabled+0xa/0x10 <4>[16097.964351] ? __mutex_lock.isra.8+0x2b5/0x4a0 <4>[16097.964376] ? handle_reply+0x33f/0x6f0 [ceph] <4>[16097.964407] ? dispatch+0xa6/0xbc0 [ceph] <4>[16097.964429] ? read_partial_message+0x214/0x770 [libceph] <4>[16097.964449] ? try_read+0x78b/0x11e0 [libceph] <4>[16097.964454] ? __switch_to_asm+0x40/0x70 <4>[16097.964458] ? __switch_to_asm+0x34/0x70 <4>[16097.964461] ? __switch_to_asm+0x40/0x70 <4>[16097.964465] ? __switch_to_asm+0x34/0x70 <4>[16097.964470] ? __switch_to_asm+0x40/0x70 <4>[16097.964489] ? ceph_con_workfn+0x130/0x5e0 [libceph] <4>[16097.964494] ? process_one_work+0x1ad/0x370 <4>[16097.964498] ? worker_thread+0x30/0x390 <4>[16097.964501] ? create_worker+0x1a0/0x1a0 <4>[16097.964506] ? kthread+0x112/0x130 <4>[16097.964511] ? kthread_park+0x80/0x80 <4>[16097.964516] ? ret_from_fork+0x35/0x40 URL: https://tracker.ceph.com/issues/45609 Reported-by: "Yan, Zheng" <zyan@xxxxxxxxxx> Signed-off-by: Xiubo Li <xiubli@xxxxxxxxxx> --- fs/ceph/mds_client.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 6c283c5..0e0ab01 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -3769,8 +3769,6 @@ static int encode_snap_realms(struct ceph_mds_client *mdsc, * recovering MDS might have. * * This is a relatively heavyweight operation, but it's rare. - * - * called with mdsc->mutex held. */ static void send_mds_reconnect(struct ceph_mds_client *mdsc, struct ceph_mds_session *session) @@ -4024,7 +4022,9 @@ static void check_new_map(struct ceph_mds_client *mdsc, oldstate != CEPH_MDS_STATE_STARTING) pr_info("mds%d recovery completed\n", s->s_mds); kick_requests(mdsc, i); + mutex_unlock(&mdsc->mutex); mutex_lock(&s->s_mutex); + mutex_lock(&mdsc->mutex); ceph_kick_flushing_caps(mdsc, s); mutex_unlock(&s->s_mutex); wake_up_session_caps(s, RECONNECT); -- 1.8.3.1
