[Ocfs2-users] OCFS2 is still unstable with 4.1.1 kernel, how do companies use this thing in production??

Wed Nov 18 02:06:14 PST 2015

Hi Martin,

On 11/18/15 16:31, Martin Lund wrote:
> Hello List,
>
> Earlier I was writing about my 3 node web cluster running from OCFS2. I experimented with different 3.x kernels including 3.2, 3.13, 3.16 but so far the 4.1.1
How do you draw this conclusion? AFAIK, normally the lower version is 
likely more stable.
The newest kernel version we have tested for now is 3.12.28.
> proved to be the most stable. Never the less it had major crashes in the last couple of days again (while the R/W operations are relatively low for my setup).
> I have all 3 nodes running in KVM machines on the same server, communicating with each other through libvirt-net driver (what as far as I understand is just memory copy, no packets get send out to the wire so theoretically this should provide gbit/s wide reliable, low latency link between the VMs). Now the logs suggest that the nodes lose connection between one another sometimes but this might not be a network issue but something is holding the cpu (the host server which is running the same 4.1.1 kernel has more than enough resources, 48 CPUs + 256GB ram). The only meaningful line for me in the log is:
>
> NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s!
I have no idea why cpu#0 stuck so long. I think it's not a crash, but 
just a stack trace log.

Thanks,
Eric
>
> Any ideas? Maybe I should use different IO scheduler or something inside the vm? Would upgrading the guest kernel from 4.1.1 to the latest stable improve anything?
>
>
> Nov 14 19:05:17 webserver1 kernel: [2004352.064040] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u2:1:16601]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] Modules linked in: ocfs2 quota_tree nfsd auth_rpcgss oid_registry nfs_acl nfs lockd grace
> fscache sunrpc ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager ocfs2_stackglue configfs loop psmouse pcspkr joydev evdev serio_raw ac
> pi_cpufreq i2c_piix4 processor i2c_core button virtio_balloon thermal_sys hid_generic usbhid dm_mod ata_generic virtio_net virtio_blk uhci_hcd
>   ehci_hcd ata_piix libata usbcore virtio_pci virtio_ring virtio usb_common
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] CPU: 0 PID: 16601 Comm: kworker/u2:1 Not tainted 4.1.1
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] Workqueue: o2net o2net_rx_until_empty [ocfs2_nodemanager]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] task: ffff880033084290 ti: ffff88002b498000 task.ti: ffff88002b498000
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] RIP: 0010:[<ffffffffa0193ca1>]  [<ffffffffa0193ca1>] __dlm_lookup_lockres_full+0xa3/0xe9 [
> ocfs2_dlm]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] RSP: 0018:ffff88002b49bc28  EFLAGS: 00000286
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] RAX: 00000000ffffffc1 RBX: ffffffff81547380 RCX: 0000000000000017
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] RDX: 000000000000001e RSI: ffff88006e9eb029 RDI: ffff880007c447a0
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] RBP: ffff88006e9eb028 R08: 0000000000000066 R09: 000000000000002a
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] R10: 000000000000002a R11: dead000000200200 R12: 0000000000000246
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] R13: 0000000000000050 R14: 0000000000000000 R15: 0000000000000000
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] FS:  00007f098602e7a0(0000) GS:ffff88007fc00000(0000) knlGS:0000000000000000
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] CR2: ffffffffff600400 CR3: 000000007ca91000 CR4: 00000000000006f0
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] Stack:
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  ffff88002b49bcf0 0000000000000040 ffff880033869000 ffff88006e9eb028
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  000000000000001f 00000000c6232e1b ffff88006e9eb000 ffffffffa0193d73
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  ffff88007fc00000 ffff88006ec768e8 0000000000000082 ffff880033869000
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042] Call Trace:
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffffa0193d73>] ? __dlm_lookup_lockres+0x8c/0xd3 [ocfs2_dlm]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffffa0193df9>] ? dlm_lookup_lockres+0x3f/0x5c [ocfs2_dlm]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffffa01ae6e4>] ? dlm_unlock_lock_handler+0x2af/0x663 [ocfs2_dlm]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffffa0157315>] ? o2net_handler_tree_lookup+0x5b/0xa8 [ocfs2_nodemanager]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffffa0159552>] ? o2net_rx_until_empty+0xc2c/0xc7c [ocfs2_nodemanager]
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff81001623>] ? __switch_to+0x1d4/0x457
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff81065260>] ? pick_next_task_fair+0x174/0x320
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff8105215e>] ? process_one_work+0x179/0x283
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff81052445>] ? worker_thread+0x1b8/0x292
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff8105228d>] ? process_scheduled_works+0x25/0x25
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff81056175>] ? kthread+0x99/0xa1
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff810560dc>] ? __kthread_parkme+0x58/0x58
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff815d2b52>] ? ret_from_fork+0x42/0x70
> Nov 14 19:05:17 webserver1 kernel: [2004352.064042]  [<ffffffff810560dc>] ? __kthread_parkme+0x58/0x58
> ov 14 19:05:17 webserver1 kernel: [2004352.064042] Code: c0 75 02 0f 0b 48 8b 7b 10 44 89 ee 31 db e8 8d d4 ff ff 48 8b 00 48 85 c0 74 46 45
> 8d 6c 24 ff 4c 8d 75 01 48 89 c3 48 8b 7b 18 <0f> be 45 00 0f b6 17 39 c2 75 23 44 39 63 14 75 1d 48 ff c7 4c
> Nov 14 19:05:17 webserver1 kernel: [2004356.576077] o2net: Connection to node webserver3 (num 2) at 10.0.0.247:7777 has been idle for 30.32 se
> cs.
>
>
> ...
> [Tue Nov 17 12:52:30 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:32 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:34 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:36 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:38 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:40 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:42 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:44 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:46 2015] o2net: Connection to node webserver1 (num 0) at 10.0.0.245:7777 shutdown, state 7
> [Tue Nov 17 12:52:46 2015] o2net: Accepted connection from node webserver3 (num 2) at 10.0.0.247:7777
> [Tue Nov 17 12:52:48 2015] o2net: Connected to node webserver1 (num 0) at 10.0.0.245:7777
> [Tue Nov 17 12:52:49 2015] o2dlm: Joining domain 1CA770B625644665B7677546DCC1211C ( 0 1 2 ) 3 nodes
> [Tue Nov 17 12:52:49 2015] ocfs2: Mounting device (252,16) on (node 1, slot 1) with writeback data mode.
> [Tue Nov 17 12:52:54 2015] o2dlm: Joining domain 0DE1B15CBA5340F09A7908313FCB3680 ( 0 1 2 ) 3 nodes
> [Tue Nov 17 12:52:54 2015] ocfs2: Mounting device (252,32) on (node 1, slot 0) with writeback data mode.
> [Tue Nov 17 12:52:58 2015] o2dlm: Joining domain 573D9BC0E98B47BE8EBB8FE7F1CB5281 ( 0 1 2 ) 3 nodes
> [Tue Nov 17 12:52:58 2015] ocfs2: Mounting device (252,48) on (node 1, slot 1) with writeback data mode.
>
>
> Thank you!
>
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