[Ocfs2-devel] One node hangs up issue requiring goog idea, thanks
Guozhonghua
guozhonghua at h3c.com
Fri Sep 26 05:06:10 PDT 2014
Hi, all,
As we use OCFS2, the network is not good.
When the converting request message can’t send to the another node, there will be a node hangs up which will still waiting for the dlm.
CAS2/logdir/var/log/syslog.1-6778-Sep 16 20:57:16 CAS2 kernel: [516366.623623] o2net: Connection to node CAS1 (num 1) at 10.172.254.1:7100 has been idle for 30.87 secs, shutting it down.
CAS2/logdir/var/log/syslog.1-6779-Sep 16 20:57:16 CAS2 kernel: [516366.623631] o2net_idle_timer 1621: Local and remote node is heartbeating, and try connect
CAS2/logdir/var/log/syslog.1-6780-Sep 16 20:57:16 CAS2 kernel: [516366.623792] o2net: No longer connected to node CAS1 (num 1) at 10.172.254.1:7100
CAS2/logdir/var/log/syslog.1:6781:Sep 16 20:57:16 CAS2 kernel: [516366.623881] (dlm_thread,5140,4):dlm_send_proxy_ast_msg:482 ERROR: B258FD07DDD64710B68EB9683FD7D1B9: res M00000000000000046e011700000000, error -112 send AST to node 1
CAS2/logdir/var/log/syslog.1-6782-Sep 16 20:57:16 CAS2 kernel: [516366.623900] (dlm_thread,5140,4):dlm_flush_asts:596 ERROR: status = -112
CAS2/logdir/var/log/syslog.1-6783-Sep 16 20:57:16 CAS2 kernel: [516366.623937] (dlm_thread,5140,4):dlm_send_proxy_ast_msg:482 ERROR: B258FD07DDD64710B68EB9683FD7D1B9: res M000000000000001626011000000000, error -107 send AST to node 1
CAS2/logdir/var/log/syslog.1-6784-Sep 16 20:57:16 CAS2 kernel: [516366.623946] (dlm_thread,5140,4):dlm_flush_asts:596 ERROR: status = -107
CAS2/logdir/var/log/syslog.1-6785-Sep 16 20:57:16 CAS2 kernel: [516366.623997] Connect node 1 OK, and set timeout 0
CAS2/logdir/var/log/syslog.1-6786-Sep 16 20:57:17 CAS2 kernel: [516367.623592] o2net: Connected to node CAS1 (num 1) at 10.172.254.1:7100
debugfs: fs_locks -B
Lockres: M00000000000000046e011700000000 Mode: Protected Read
Flags: Initialized Attached Busy
RO Holders: 0 EX Holders: 0
Pending Action: Convert Pending Unlock Action: None
Requested Mode: Exclusive Blocking Mode: No Lock
PR > Gets: 318317 Fails: 0 Waits (usec) Total: 128622 Max: 3
EX > Gets: 706878 Fails: 0 Waits (usec) Total: 284967 Max: 2
Disk Refreshes: 0
debugfs: dlm_locks M00000000000000046e011700000000
Lockres: M00000000000000046e011700000000 Owner: 2 State: 0x0
Last Used: 0 ASTs Reserved: 0 Inflight: 0 Migration Pending: No
Refs: 4 Locks: 2 On Lists: None
Reference Map: 1
Lock-Queue Node Level Conv Cookie Refs AST BAST Pending-Action
Granted 1 PR -1 1:195 2 No No None
Converting 2 PR EX 2:196 2 No No None
We reviews the code, and want to resend the dlm message to avoid it.
The patch is required reviewing.
The patch has been test when the network interface is shut down and up manually to recreate the issue.
If the TCP channel between two node set up within 5 seconds, resend msg works well.
We are forward to appreciate another better way to avoid it.
Thanks.
--- ocfs2/dlm/dlmthread.c 2014-06-07 10:40:09.000000000 +0800
+++ ocfs2/dlm/dlmthread.c 2014-09-26 16:42:36.000000000 +0800
@@ -517,6 +517,9 @@ static void dlm_flush_asts(struct dlm_ct
struct dlm_lock_resource *res;
u8 hi;
+ /* resend the msg again */
+ int send_times = 0;
+
spin_lock(&dlm->ast_lock);
while (!list_empty(&dlm->pending_asts)) {
lock = list_entry(dlm->pending_asts.next,
@@ -539,9 +542,16 @@ static void dlm_flush_asts(struct dlm_ct
spin_unlock(&dlm->ast_lock);
if (lock->ml.node != dlm->node_num) {
- ret = dlm_do_remote_ast(dlm, res, lock);
- if (ret < 0)
+ ret = dlm_do_remote_ast(dlm, res, lock);
+ if (ret < 0) {
mlog_errno(ret);
+ while ((ret == -112 || ret == -107) && send_times++ < 5 ) {
+ msleep(1000);
+ ret = dlm_do_remote_ast(dlm, res, lock);
+ mlog(ML_NOTICE, "AST message retry send again, %d code, send_time = %d\n", ret, send_times);
+ }
+ send_times = 0;
+ }
} else
dlm_do_local_ast(dlm, res, lock);
@@ -592,8 +602,15 @@ static void dlm_flush_asts(struct dlm_ct
if (lock->ml.node != dlm->node_num) {
ret = dlm_send_proxy_bast(dlm, res, lock, hi);
- if (ret < 0)
+ if (ret < 0) {
mlog_errno(ret);
+ while ((ret == -112 || ret == -107) && send_times++ < 5 ) {
+ msleep(1000);
+ ret = dlm_send_proxy_bast(dlm, res, lock, hi);;
+ mlog(ML_NOTICE, "BAST message retry send again, %d code, send_time = %d\n", ret, send_times);
+ }
+ send_times = 0;
+ }
} else
dlm_do_local_bast(dlm, res, lock, hi);
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