[Openstack] BUG: soft lockup messages
Matej Mailing
mailing at tam.si
Sun Jan 4 18:39:23 UTC 2015
2015-01-04 17:10 GMT+01:00 Erhan Ekici <erhan.ekici at gmail.com>:
> Hi Matej,
>
> I am not sure but most of the soft lock-up messages generated due to I/O
> issues. From your log entries, I see mysqld issues as well as others:
>
> Jan 3 10:41:44 postar kernel: [303154.352793] NMI watchdog: BUG: soft
> lockup - CPU#3 stuck for 45s! [mysqld:4601]
> ....
> Jan 3 10:44:00 postar kernel: [303290.052498] INFO: task mysqld:2290
> blocked for more than 120 seconds.
> Jan 3 10:41:44 postar kernel: [303154.352958] CPU: 3 PID: 4601 Comm: mysqld
> Not tainted 3.18.1-031801-generic #201412170637
> ....
> Jan 3 10:44:00 postar kernel: [303290.052499] Tainted: G L
> 3.18.1-031801-generic #201412170637
> Jan 3 10:44:00 postar kernel: [303290.052499] "echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> Jan 3 10:44:00 postar kernel: [303290.052502] mysqld D
> 0000000000000002 0 2290 1 0x00000000
>
> Can you post the output of the following command on both instance nodes OS
> and compute node OS and memory of Compute node and instances?
>
> [user at node] sudo sysctl -a | grep dirty
>
> vm.dirty_background_bytes = 0
> vm.dirty_background_ratio = 10
> vm.dirty_bytes = 0
> vm.dirty_expire_centisecs = 3000
> vm.dirty_ratio = 20
> vm.dirty_writeback_centisecs = 500
>
>
> Erhan,
Hello Erhan,
instance node output:
error: permission denied on key 'net.ipv4.route.flush'
error: permission denied on key 'net.ipv6.route.flush'
error: permission denied on key 'vm.compact_memory'
vm.dirty_background_bytes = 0
vm.dirty_background_ratio = 10
vm.dirty_bytes = 0
vm.dirty_expire_centisecs = 3000
vm.dirty_ratio = 20
vm.dirty_writeback_centisecs = 500
Mem: 8175996k total, 4105708k used, 4070288k free, 218552k buffers
compute node output:
vm.dirty_background_bytes = 0
vm.dirty_background_ratio = 10
vm.dirty_bytes = 0
vm.dirty_expire_centisecs = 3000
vm.dirty_ratio = 20
vm.dirty_writeback_centisecs = 500
KiB Mem: 16432492 total, 16254932 used, 177560 free, 9316 buffers
Lock-ups happen with different processes, above-mentioned mysqld is
just an example.
Thanks,
Matej
>
> On Sun, Jan 4, 2015 at 2:36 PM, Matej Mailing <mailing at tam.si> wrote:
>>
>> 2015-01-03 17:56 GMT+01:00 John Griffith <john.griffith at solidfire.com>:
>> > On Sat, Jan 3, 2015 at 5:05 AM, Matej Mailing <mailing at tam.si> wrote:
>> >> Hi,
>> >>
>> >> we are experiencing randomly-timed soft lockup messages in different
>> >> instances (running CentOS, Ubuntu, etc.) with different processes and
>> >> on different compute nodes. I suspect that access to the cinder
>> >> storage via NFS could be the cause of issue, but then perhaps all the
>> >> instances would trigger the error message on the same time? Currently
>> >> they don't and no higher access loads are repoted on the NFS server
>> >> itself, neither the load is higher at those times ...
>> >> What are the best methods to debug this error? Any suggestions and
>> >> expeiences on fixing it will be very welcome :-)
>> >>
>> >> Thanks,
>> >> Matej
>> >>
>> >> _______________________________________________
>> >> Mailing list:
>> >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> >> Post to : openstack at lists.openstack.org
>> >> Unsubscribe :
>> >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>> >
>> > Hi Matej,
>> >
>> > I'm assuming the kernel logs indicate NFS as the culprit here? What
>> > sort of IO load are you seeing on the system when these are
>> > encountered?
>> >
>> > A quick search on "soft lockup nfs" has a pretty lengthy list of
>> > results including some setting recommendations etc. Maybe start
>> > there?
>> >
>> > Thanks,
>> > John
>>
>> Hello John,
>>
>> thank you very much for your answer. I can't find anything at all in
>> the compute node's logs and my NFS-idea is just a guess
>> actually.Example entry from Ubuntu instances is like:
>>
>> Jan 3 10:41:44 postar kernel: [303154.352793] NMI watchdog: BUG: soft
>> lockup - CPU#3 stuck for 45s! [mysqld:4601]
>> Jan 3 10:41:44 postar kernel: [303154.352890] Modules linked in:
>> xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT
>> nf_reject_ipv4 xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4
>> nf_defrag_ipv4 xt_state ip6table_filter ip6_tables nfsd nfs_acl
>> auth_rpcgss nf_conntrack_netbios_ns
>> nf_conntrack_broadcast nfs nf_nat_ftp nf_nat ppdev nf_conntrack_ftp
>> nf_conntrack fscache parport_pc parport lockd joydev pvpanic
>> iptable_filter cirrus ip_tables 8250_fintek ttm psmouse drm_kms_helper
>> sunrpc x_tables serio_raw hid_generic drm grace mac_hid sysimgblt
>> sysfillrect syscopyarea
>> i2c_piix4 usbhid hid floppy
>> Jan 3 10:41:44 postar kernel: [303154.352958] CPU: 3 PID: 4601 Comm:
>> mysqld Not tainted 3.18.1-031801-generic #201412170637
>> Jan 3 10:41:44 postar kernel: [303154.352961] Hardware name:
>> OpenStack Foundation OpenStack Nova, BIOS Bochs 01/01/2011
>> Jan 3 10:41:44 postar kernel: [303154.352964] task: ffff880231b63c00
>> ti: ffff8801e6014000 task.ti: ffff8801e6014000
>> Jan 3 10:41:44 postar kernel: [303154.352966] RIP:
>> 0010:[<ffffffff813a97dc>] [<ffffffff813a97dc>]
>> copy_user_generic_string+0x2c/0x40
>> Jan 3 10:41:44 postar kernel: [303154.352979] RSP:
>> 0018:ffff8801e6017c90 EFLAGS: 00010246
>> Jan 3 10:41:44 postar kernel: [303154.352981] RAX: 00000000a2418000
>> RBX: ffff8801e6017ea0 RCX: 0000000000000200
>> Jan 3 10:41:44 postar kernel: [303154.352983] RDX: 0000000000000000
>> RSI: ffff8800a2418000 RDI: 00007fd365b90000
>> Jan 3 10:41:44 postar kernel: [303154.352985] RBP: ffff8801e6017d08
>> R08: ffffea000289061c R09: ffff8801e6017ca0
>> Jan 3 10:41:44 postar kernel: [303154.352987] R10: ffff8800a5c1b258
>> R11: 0000000000000293 R12: 0000000000000000
>> Jan 3 10:41:44 postar kernel: [303154.352989] R13: ffff8801e6017ec8
>> R14: 0000000000001000 R15: 00007fd365b90000
>> Jan 3 10:41:44 postar kernel: [303154.352995] FS:
>> 00007fd36c28e700(0000) GS:ffff88023fd80000(0000)
>> knlGS:0000000000000000
>> Jan 3 10:41:44 postar kernel: [303154.352998] CS: 0010 DS: 0000 ES:
>> 0000 CR0: 0000000080050033
>> Jan 3 10:41:44 postar kernel: [303154.353000] CR2: 0000000002b9e003
>> CR3: 00000002317ee000 CR4: 00000000000006e0
>> Jan 3 10:41:44 postar kernel: [303154.353014] Stack:
>> Jan 3 10:41:44 postar kernel: [303154.353016] ffffffff811a0f75
>> ffff8801e6017d88 ffff8800a5c1b258 ffff8801e6017cc8
>> Jan 3 10:41:44 postar kernel: [303154.353019] ffffffff8117864e
>> ffff8800a2418000 ffffea0002890600 0000000000001000
>> Jan 3 10:41:44 postar kernel: [303154.353023] ffff8800a2418000
>> 0000000000000000 ffffea0002890600 ffff880231e4b930
>> Jan 3 10:41:44 postar kernel: [303154.353026] Call Trace:
>> Jan 3 10:41:44 postar kernel: [303154.353034] [<ffffffff811a0f75>] ?
>> copy_page_to_iter_iovec+0xe5/0x300
>> Jan 3 10:41:44 postar kernel: [303154.353040] [<ffffffff8117864e>] ?
>> find_get_entry+0x1e/0x90
>> Jan 3 10:41:44 postar kernel: [303154.353044] [<ffffffff811a14a6>]
>> copy_page_to_iter+0x16/0x70
>> Jan 3 10:41:44 postar kernel: [303154.353047] [<ffffffff81179428>]
>> do_generic_file_read+0x1f8/0x490
>> Jan 3 10:41:44 postar kernel: [303154.353051] [<ffffffff8117a234>]
>> generic_file_read_iter+0xf4/0x150
>> Jan 3 10:41:44 postar kernel: [303154.353056] [<ffffffff810aade1>] ?
>> update_curr+0x141/0x1f0
>> Jan 3 10:41:44 postar kernel: [303154.353060] [<ffffffff810efcd8>] ?
>> get_futex_key+0x1f8/0x2e0
>> Jan 3 10:41:44 postar kernel: [303154.353065] [<ffffffff811eef28>]
>> new_sync_read+0x78/0xb0
>> Jan 3 10:41:44 postar kernel: [303154.353068] [<ffffffff811f013b>]
>> vfs_read+0xab/0x180
>> Jan 3 10:41:44 postar kernel: [303154.353071] [<ffffffff811f0402>]
>> SyS_pread64+0x92/0xa0
>> Jan 3 10:41:44 postar kernel: [303154.353077] [<ffffffff817b376d>]
>> system_call_fastpath+0x16/0x1b
>> Jan 3 10:41:44 postar kernel: [303154.353079] Code: 66 90 83 fa 08 72
>> 27 89 f9 83 e1 07 74 15 83 e9 08 f7 d9 29 ca 8a 06 88 07 48 ff c6 48
>> ff c7 ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 <f3> 48 a5 89 d1 f3 a4 31 c0
>> 66 66 90 c3 0f 1f 80 00 00 00 00 66
>>
>>
>> and:
>>
>> Jan 3 10:44:00 postar kernel: [303164.436029] INFO: rcu_sched
>> detected stalls on CPUs/tasks: { 3} (detected by 0, t=33923 jiffies,
>> g=1793081, c=1793080, q=0)
>> Jan 3 10:44:00 postar kernel: [303164.436029] Task dump for CPU 3:
>> Jan 3 10:44:00 postar kernel: [303164.436029] mysqld R
>> running task 0 4601 1 0x00000008
>> Jan 3 10:44:00 postar kernel: [303164.436029] 0000000000000001
>> 00007fd36286c000 0000000000004000 0000000000004000
>> Jan 3 10:44:00 postar kernel: [303164.436029] 00007fd36286c000
>> ffff8801e6017f28 ffffffff811f013b 00007fd36c28ba80
>> Jan 3 10:44:00 postar kernel: [303164.436029] ffff8802316eaf01
>> ffff8802316eaf00 00007fd36286c000 0000000000004000
>> Jan 3 10:44:00 postar kernel: [303164.436029] Call Trace:
>> Jan 3 10:44:00 postar kernel: [303164.436029] [<ffffffff811f013b>] ?
>> vfs_read+0xab/0x180
>> Jan 3 10:44:00 postar kernel: [303164.436029] [<ffffffff811f0402>] ?
>> SyS_pread64+0x92/0xa0
>> Jan 3 10:44:00 postar kernel: [303164.436029] [<ffffffff817b376d>] ?
>> system_call_fastpath+0x16/0x1b
>> Jan 3 10:44:00 postar kernel: [303290.052393] INFO: task
>> jbd2/vda1-8:256 blocked for more than 120 seconds.
>> Jan 3 10:44:00 postar kernel: [303290.052395] Tainted: G
>> L 3.18.1-031801-generic #201412170637
>> Jan 3 10:44:00 postar kernel: [303290.052396] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Jan 3 10:44:00 postar kernel: [303290.052399] jbd2/vda1-8 D
>> 0000000000000002 0 256 2 0x00000000
>> Jan 3 10:44:00 postar kernel: [303290.052402] ffff88023170b6a8
>> 0000000000000046 ffff88023170b648 0000000000f2f754
>> Jan 3 10:44:00 postar kernel: [303290.052404] ffff88023170bfd8
>> 0000000000013640 ffff8800baef5f80 0000000000013640
>> Jan 3 10:44:00 postar kernel: [303290.052406] ffff8802342ab200
>> ffff880231b64600 ffff88023170b678 ffff88023fd13f40
>> Jan 3 10:44:00 postar kernel: [303290.052407] Call Trace:
>> Jan 3 10:44:00 postar kernel: [303290.052413] [<ffffffff817af549>]
>> schedule+0x29/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052415] [<ffffffff817af61f>]
>> io_schedule+0x8f/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052419] [<ffffffff81379f30>]
>> bt_get+0xf0/0x180
>> Jan 3 10:44:00 postar kernel: [303290.052423] [<ffffffff810b4bd0>] ?
>> prepare_to_wait_event+0x100/0x100
>> Jan 3 10:44:00 postar kernel: [303290.052425] [<ffffffff8137a2f2>]
>> blk_mq_get_tag+0x82/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052428] [<ffffffff813762da>]
>> __blk_mq_alloc_request+0x2a/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052430] [<ffffffff81377d72>]
>> blk_mq_map_request+0x182/0x1f0
>> Jan 3 10:44:00 postar kernel: [303290.052432] [<ffffffff81377a36>] ?
>> __blk_mq_run_hw_queue+0xf6/0x260
>> Jan 3 10:44:00 postar kernel: [303290.052434] [<ffffffff81378446>]
>> blk_sq_make_request+0x96/0x310
>> Jan 3 10:44:00 postar kernel: [303290.052438] [<ffffffff81369c65>]
>> generic_make_request.part.75+0x75/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052440] [<ffffffff8136a288>]
>> generic_make_request+0x68/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052442] [<ffffffff8136a316>]
>> submit_bio+0x86/0x160
>> Jan 3 10:44:00 postar kernel: [303290.052446] [<ffffffff81177789>] ?
>> unlock_page+0x69/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052449] [<ffffffff81278b39>]
>> ext4_io_submit+0x29/0x50
>> Jan 3 10:44:00 postar kernel: [303290.052451] [<ffffffff8127427b>]
>> ext4_writepage+0xcb/0x240
>> Jan 3 10:44:00 postar kernel: [303290.052454] [<ffffffff811b16c0>] ?
>> SyS_msync+0x230/0x230
>> Jan 3 10:44:00 postar kernel: [303290.052457] [<ffffffff81182b87>]
>> __writepage+0x17/0x50
>> Jan 3 10:44:00 postar kernel: [303290.052460] [<ffffffff8118323a>]
>> write_cache_pages+0x20a/0x470
>> Jan 3 10:44:00 postar kernel: [303290.052462] [<ffffffff81182b70>] ?
>> set_page_dirty_lock+0x60/0x60
>> Jan 3 10:44:00 postar kernel: [303290.052464] [<ffffffff811834ea>]
>> generic_writepages+0x4a/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052468] [<ffffffff812bb73f>]
>> journal_submit_data_buffers+0xcf/0x180
>> Jan 3 10:44:00 postar kernel: [303290.052470] [<ffffffff812bc1c4>]
>> jbd2_journal_commit_transaction+0x394/0x1440
>> Jan 3 10:44:00 postar kernel: [303290.052474] [<ffffffff812c09b3>]
>> kjournald2+0xb3/0x230
>> Jan 3 10:44:00 postar kernel: [303290.052476] [<ffffffff810b4bd0>] ?
>> prepare_to_wait_event+0x100/0x100
>> Jan 3 10:44:00 postar kernel: [303290.052478] [<ffffffff812c0900>] ?
>> commit_timeout+0x10/0x10
>> Jan 3 10:44:00 postar kernel: [303290.052481] [<ffffffff81093a09>]
>> kthread+0xc9/0xe0
>> Jan 3 10:44:00 postar kernel: [303290.052483] [<ffffffff81093940>] ?
>> flush_kthread_worker+0x90/0x90
>> Jan 3 10:44:00 postar kernel: [303290.052485] [<ffffffff817b36bc>]
>> ret_from_fork+0x7c/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052487] [<ffffffff81093940>] ?
>> flush_kthread_worker+0x90/0x90
>> Jan 3 10:44:00 postar kernel: [303290.052498] INFO: task mysqld:2290
>> blocked for more than 120 seconds.
>> Jan 3 10:44:00 postar kernel: [303290.052499] Tainted: G
>> L 3.18.1-031801-generic #201412170637
>> Jan 3 10:44:00 postar kernel: [303290.052499] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Jan 3 10:44:00 postar kernel: [303290.052502] mysqld D
>> 0000000000000002 0 2290 1 0x00000000
>> Jan 3 10:44:00 postar kernel: [303290.052504] ffff88023122b9c8
>> 0000000000000082 ffff880200000002 0000000000f2f748
>> Jan 3 10:44:00 postar kernel: [303290.052506] ffff88023122bfd8
>> 0000000000013640 ffff880231b98380 0000000000013640
>> Jan 3 10:44:00 postar kernel: [303290.052508] ffff880037ab3200
>> ffff880233142800 ffff88023122b998 ffff88023fd13f40
>> Jan 3 10:44:00 postar kernel: [303290.052509] Call Trace:
>> Jan 3 10:44:00 postar kernel: [303290.052511] [<ffffffff817af549>]
>> schedule+0x29/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052531] [<ffffffff817af61f>]
>> io_schedule+0x8f/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052534] [<ffffffff81379f30>]
>> bt_get+0xf0/0x180
>> Jan 3 10:44:00 postar kernel: [303290.052536] [<ffffffff810b4bd0>] ?
>> prepare_to_wait_event+0x100/0x100
>> Jan 3 10:44:00 postar kernel: [303290.052538] [<ffffffff8137a2f2>]
>> blk_mq_get_tag+0x82/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052540] [<ffffffff813762da>]
>> __blk_mq_alloc_request+0x2a/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052542] [<ffffffff81377d72>]
>> blk_mq_map_request+0x182/0x1f0
>> Jan 3 10:44:00 postar kernel: [303290.052545] [<ffffffff81378446>]
>> blk_sq_make_request+0x96/0x310
>> Jan 3 10:44:00 postar kernel: [303290.052547] [<ffffffff81369c65>]
>> generic_make_request.part.75+0x75/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052549] [<ffffffff8136a288>]
>> generic_make_request+0x68/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052551] [<ffffffff8136a316>]
>> submit_bio+0x86/0x160
>> Jan 3 10:44:00 postar kernel: [303290.052553] [<ffffffff812b940d>] ?
>> jbd2__journal_start+0x4d/0x60
>> Jan 3 10:44:00 postar kernel: [303290.052555] [<ffffffff81278b39>]
>> ext4_io_submit+0x29/0x50
>> Jan 3 10:44:00 postar kernel: [303290.052557] [<ffffffff81277446>]
>> ext4_writepages+0x4f6/0x7b0
>> Jan 3 10:44:00 postar kernel: [303290.052560] [<ffffffff810efcd8>] ?
>> get_futex_key+0x1f8/0x2e0
>> Jan 3 10:44:00 postar kernel: [303290.052563] [<ffffffff81184730>]
>> do_writepages+0x20/0x40
>> Jan 3 10:44:00 postar kernel: [303290.052565] [<ffffffff81179b29>]
>> __filemap_fdatawrite_range+0x59/0x60
>> Jan 3 10:44:00 postar kernel: [303290.052567] [<ffffffff81179b67>]
>> filemap_write_and_wait_range+0x37/0x80
>> Jan 3 10:44:00 postar kernel: [303290.052571] [<ffffffff8126c3a5>]
>> ext4_sync_file+0x105/0x290
>> Jan 3 10:44:00 postar kernel: [303290.052573] [<ffffffff811f0036>] ?
>> vfs_write+0x196/0x1f0
>> Jan 3 10:44:00 postar kernel: [303290.052576] [<ffffffff8121faa8>]
>> do_fsync+0x58/0x80
>> Jan 3 10:44:00 postar kernel: [303290.052578] [<ffffffff8121fe70>]
>> SyS_fsync+0x10/0x20
>> Jan 3 10:44:00 postar kernel: [303290.052580] [<ffffffff817b376d>]
>> system_call_fastpath+0x16/0x1b
>> Jan 3 10:44:00 postar kernel: [303290.052590] INFO: task
>> kworker/u8:1:22405 blocked for more than 120 seconds.
>> Jan 3 10:44:00 postar kernel: [303290.052592] Tainted: G
>> L 3.18.1-031801-generic #201412170637
>> Jan 3 10:44:00 postar kernel: [303290.052592] "echo 0 >
>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
>> Jan 3 10:44:00 postar kernel: [303290.052595] kworker/u8:1 D
>> 0000000000000002 0 22405 2 0x00000000
>> Jan 3 10:44:00 postar kernel: [303290.052600] Workqueue: writeback
>> bdi_writeback_workfn (flush-253:0)
>> Jan 3 10:44:00 postar kernel: [303290.052602] ffff8801f38374c8
>> 0000000000000046 ffff8801f38374b8 0000000000f2f754
>> Jan 3 10:44:00 postar kernel: [303290.052604] ffff8801f3837fd8
>> 0000000000013640 ffff8800baef5f80 0000000000013640
>> Jan 3 10:44:00 postar kernel: [303290.052606] ffff880231b64600
>> ffff8801f397d000 ffff8801f3837498 ffff88023fd13f40
>> Jan 3 10:44:00 postar kernel: [303290.052607] Call Trace:
>> Jan 3 10:44:00 postar kernel: [303290.052609] [<ffffffff817af549>]
>> schedule+0x29/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052611] [<ffffffff817af61f>]
>> io_schedule+0x8f/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052614] [<ffffffff81379f30>]
>> bt_get+0xf0/0x180
>> Jan 3 10:44:00 postar kernel: [303290.052616] [<ffffffff810b4bd0>] ?
>> prepare_to_wait_event+0x100/0x100
>> Jan 3 10:44:00 postar kernel: [303290.052618] [<ffffffff8137a2f2>]
>> blk_mq_get_tag+0x82/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052620] [<ffffffff813762da>]
>> __blk_mq_alloc_request+0x2a/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052622] [<ffffffff81377d72>]
>> blk_mq_map_request+0x182/0x1f0
>> Jan 3 10:44:00 postar kernel: [303290.052626] [<ffffffff814692de>] ?
>> alloc_indirect+0x1e/0x50
>> Jan 3 10:44:00 postar kernel: [303290.052628] [<ffffffff81378446>]
>> blk_sq_make_request+0x96/0x310
>> Jan 3 10:44:00 postar kernel: [303290.052630] [<ffffffff81369c65>]
>> generic_make_request.part.75+0x75/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052633] [<ffffffff8136a288>]
>> generic_make_request+0x68/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052634] [<ffffffff8136a316>]
>> submit_bio+0x86/0x160
>> Jan 3 10:44:00 postar kernel: [303290.052638] [<ffffffff81364e5b>] ?
>> bio_alloc_bioset+0xbb/0x220
>> Jan 3 10:44:00 postar kernel: [303290.052641] [<ffffffff81223ff0>]
>> _submit_bh+0x110/0x150
>> Jan 3 10:44:00 postar kernel: [303290.052643] [<ffffffff81224040>]
>> submit_bh+0x10/0x20
>> Jan 3 10:44:00 postar kernel: [303290.052646] [<ffffffff81225cc0>]
>> __block_write_full_page.constprop.35+0x1a0/0x380
>> Jan 3 10:44:00 postar kernel: [303290.052648] [<ffffffff81226110>] ?
>> I_BDEV+0x10/0x10
>> Jan 3 10:44:00 postar kernel: [303290.052650] [<ffffffff81226110>] ?
>> I_BDEV+0x10/0x10
>> Jan 3 10:44:00 postar kernel: [303290.052652] [<ffffffff81226039>]
>> block_write_full_page+0xa9/0xe0
>> Jan 3 10:44:00 postar kernel: [303290.052654] [<ffffffff81226b38>]
>> blkdev_writepage+0x18/0x20
>> Jan 3 10:44:00 postar kernel: [303290.052656] [<ffffffff81182b87>]
>> __writepage+0x17/0x50
>> Jan 3 10:44:00 postar kernel: [303290.052658] [<ffffffff8118323a>]
>> write_cache_pages+0x20a/0x470
>> Jan 3 10:44:00 postar kernel: [303290.052660] [<ffffffff81182b70>] ?
>> set_page_dirty_lock+0x60/0x60
>> Jan 3 10:44:00 postar kernel: [303290.052663] [<ffffffff811834ea>]
>> generic_writepages+0x4a/0x70
>> Jan 3 10:44:00 postar kernel: [303290.052665] [<ffffffff81184730>]
>> do_writepages+0x20/0x40
>> Jan 3 10:44:00 postar kernel: [303290.052668] [<ffffffff81217fe5>]
>> __writeback_single_inode+0x45/0x1c0
>> Jan 3 10:44:00 postar kernel: [303290.052670] [<ffffffff812199be>]
>> writeback_sb_inodes+0x22e/0x340
>> Jan 3 10:44:00 postar kernel: [303290.052673] [<ffffffff81219b6e>]
>> __writeback_inodes_wb+0x9e/0xd0
>> Jan 3 10:44:00 postar kernel: [303290.052675] [<ffffffff81219e2b>]
>> wb_writeback+0x28b/0x330
>> Jan 3 10:44:00 postar kernel: [303290.052678] [<ffffffff8120ac32>] ?
>> get_nr_dirty_inodes+0x52/0x80
>> Jan 3 10:44:00 postar kernel: [303290.052681] [<ffffffff81219f6f>]
>> wb_check_old_data_flush+0x9f/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052683] [<ffffffff8121a0b4>]
>> wb_do_writeback+0x134/0x1c0
>> Jan 3 10:44:00 postar kernel: [303290.052685] [<ffffffff810908bf>] ?
>> set_worker_desc+0x6f/0x80
>> Jan 3 10:44:00 postar kernel: [303290.052688] [<ffffffff8121c048>]
>> bdi_writeback_workfn+0x78/0x1f0
>> Jan 3 10:44:00 postar kernel: [303290.052729] [<ffffffff8108d50e>]
>> process_one_work+0x14e/0x460
>> Jan 3 10:44:00 postar kernel: [303290.052732] [<ffffffff8108de8b>]
>> worker_thread+0x11b/0x3f0
>> Jan 3 10:44:00 postar kernel: [303290.052735] [<ffffffff8108dd70>] ?
>> create_worker+0x1e0/0x1e0
>> Jan 3 10:44:00 postar kernel: [303290.052737] [<ffffffff81093a09>]
>> kthread+0xc9/0xe0
>> Jan 3 10:44:00 postar kernel: [303290.052739] [<ffffffff81093940>] ?
>> flush_kthread_worker+0x90/0x90
>> Jan 3 10:44:00 postar kernel: [303290.052741] [<ffffffff817b36bc>]
>> ret_from_fork+0x7c/0xb0
>> Jan 3 10:44:00 postar kernel: [303290.052743] [<ffffffff81093940>] ?
>> flush_kthread_worker+0x90/0x90
>>
>> The instance's qcow2 file is on a NFS share, mounted on a compute node.
>>
>> Different processes are triggering the soft lock-up, what is
>> interesting is that we see soft lock-ups showing up on the same time
>> on all the instances running on the same compute node. I will examine
>> iostat and top outputs closely when it happens, it's relatively hard
>> to catch that moment since it happens for a relatively short period of
>> time.
>>
>> Thank you for any ideas in advance.
>> Matej
>>
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