Hi Matej, Can you change the values(both on compute and instance node) and see if soft lock-ups generated again? There are two approaches; one decreasing and the other increasing the cache.
vm.dirty_background_ratio = 5 vm.dirty_ratio = 10 If I/O & Cache is not the source of the problem, we should focus on CPU settings or kernel. For example, you can try to use a different kernel (before 3.18.1) and see if it happens again? Thanks, Erhan On Sun, Jan 4, 2015 at 8:39 PM, Matej Mailing <[email protected]> wrote: > 2015-01-04 17:10 GMT+01:00 Erhan Ekici <[email protected]>: > > 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@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 <[email protected]> wrote: > >> > >> 2015-01-03 17:56 GMT+01:00 John Griffith <[email protected]>: > >> > On Sat, Jan 3, 2015 at 5:05 AM, Matej Mailing <[email protected]> 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 : [email protected] > >> >> 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 > >> > >> _______________________________________________ > >> Mailing list: > >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > >> Post to : [email protected] > >> Unsubscribe : > >> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack > > > > >
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