> Thank you Stefan and Campbell for the info - hope 4.7rc5 resolves this > for us - please note that my workload is purely RBD, no QEMU/KVM. > Also, we do not have CFQ turned on, neither scsi-mq and blk-mq, so I > am surmising ceph-osd must be using something from the fair scheduler. > I read that its IO has been switched to blk-mq internally, so maybe > there is a relationship there. If the OSD code is compiled against the source from a buggy fair scheduler code, then that would be an OSD code issue, correct? > > We had no such problems with kernel 4.2.x, but had other issues with > XFS, which do not seem to happen now. > > Regards, > Alex > >> >> Stefan >> >> Am 29.06.2016 um 11:41 schrieb Campbell Steven: >>> Hi Alex/Stefan, >>> >>> I'm in the middle of testing 4.7rc5 on our test cluster to confirm >>> once and for all this particular issue has been completely resolved by >>> Peter's recent patch to sched/fair.c refereed to by Stefan above. For >>> us anyway the patches that Stefan applied did not solve the issue and >>> neither did any 4.5.x or 4.6.x released kernel thus far, hopefully it >>> does the trick for you. We could get about 4 hours uptime before >>> things went haywire for us. >>> >>> It's interesting how it seems the CEPH workload triggers this bug so >>> well as it's quite a long standing issue that's only just been >>> resolved, another user chimed in on the lkml thread a couple of days >>> ago as well and again his trace had ceph-osd in it as well. >>> >>> https://lkml.org/lkml/headers/2016/6/21/491 >>> >>> Campbell >>> >>> On 29 June 2016 at 18:29, Stefan Priebe - Profihost AG >>> <s.priebe@xxxxxxxxxxxx> wrote: >>>> >>>> Am 29.06.2016 um 04:30 schrieb Alex Gorbachev: >>>>> Hi Stefan, >>>>> >>>>> On Tue, Jun 28, 2016 at 1:46 PM, Stefan Priebe - Profihost AG >>>>> <s.priebe@xxxxxxxxxxxx> wrote: >>>>>> Please be aware that you may need even more patches. Overall this needs 3 >>>>>> patches. Where the first two try to fix a bug and the 3rd one fixes the >>>>>> fixes + even more bugs related to the scheduler. I've no idea on which patch >>>>>> level Ubuntu is. >>>>> >>>>> Stefan, would you be able to please point to the other two patches >>>>> beside https://lkml.org/lkml/diff/2016/6/22/102/1 ? >>>> >>>> Sorry sure yes: >>>> >>>> 1. 2b8c41daba32 ("sched/fair: Initiate a new task's util avg to a >>>> bounded value") >>>> >>>> 2.) 40ed9cba24bb7e01cc380a02d3f04065b8afae1d ("sched/fair: Fix >>>> post_init_entity_util_avg() serialization") >>>> >>>> 3.) the one listed at lkml. >>>> >>>> Stefan >>>> >>>>> >>>>> Thank you, >>>>> Alex >>>>> >>>>>> >>>>>> Stefan >>>>>> >>>>>> Excuse my typo sent from my mobile phone. >>>>>> >>>>>> Am 28.06.2016 um 17:59 schrieb Tim Bishop <tim-lists@xxxxxxxxxxx>: >>>>>> >>>>>> Yes - I noticed this today on Ubuntu 16.04 with the default kernel. No >>>>>> useful information to add other than it's not just you. >>>>>> >>>>>> Tim. >>>>>> >>>>>> On Tue, Jun 28, 2016 at 11:05:40AM -0400, Alex Gorbachev wrote: >>>>>> >>>>>> After upgrading to kernel 4.4.13 on Ubuntu, we are seeing a few of >>>>>> >>>>>> these issues where an OSD would fail with the stack below. I logged a >>>>>> >>>>>> bug at https://bugzilla.kernel.org/show_bug.cgi?id=121101 and there is >>>>>> >>>>>> a similar description at https://lkml.org/lkml/2016/6/22/102, but the >>>>>> >>>>>> odd part is we have turned off CFQ and blk-mq/scsi-mq and are using >>>>>> >>>>>> just the noop scheduler. >>>>>> >>>>>> >>>>>> Does the ceph kernel code somehow use the fair scheduler code block? >>>>>> >>>>>> >>>>>> Thanks >>>>>> >>>>>> -- >>>>>> >>>>>> Alex Gorbachev >>>>>> >>>>>> Storcium >>>>>> >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.684974] CPU: 30 PID: >>>>>> >>>>>> 10403 Comm: ceph-osd Not tainted 4.4.13-040413-generic #201606072354 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.684991] Hardware name: >>>>>> >>>>>> Supermicro X9DRi-LN4+/X9DR3-LN4+/X9DRi-LN4+/X9DR3-LN4+, BIOS 3.2 >>>>>> >>>>>> 03/04/2015 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685009] task: >>>>>> >>>>>> ffff880f79df8000 ti: ffff880f79fb8000 task.ti: ffff880f79fb8000 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685024] RIP: >>>>>> >>>>>> 0010:[<ffffffff810b416e>] [<ffffffff810b416e>] >>>>>> >>>>>> task_numa_find_cpu+0x22e/0x6f0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685051] RSP: >>>>>> >>>>>> 0018:ffff880f79fbb818 EFLAGS: 00010206 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685063] RAX: >>>>>> >>>>>> 0000000000000000 RBX: ffff880f79fbb8b8 RCX: 0000000000000000 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685076] RDX: >>>>>> >>>>>> 0000000000000000 RSI: 0000000000000000 RDI: ffff8810352d4800 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685107] RBP: >>>>>> >>>>>> ffff880f79fbb880 R08: 00000001020cf87c R09: 0000000000ff00ff >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685150] R10: >>>>>> >>>>>> 0000000000000009 R11: 0000000000000006 R12: ffff8807c3adc4c0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685194] R13: >>>>>> >>>>>> 0000000000000006 R14: 000000000000033e R15: fffffffffffffec7 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685238] FS: >>>>>> >>>>>> 00007f30e46b8700(0000) GS:ffff88105f580000(0000) >>>>>> >>>>>> knlGS:0000000000000000 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685283] CS: 0010 DS: >>>>>> >>>>>> 0000 ES: 0000 CR0: 0000000080050033 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685310] CR2: >>>>>> >>>>>> 000000001321a000 CR3: 0000000853598000 CR4: 00000000000406e0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685354] Stack: >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685374] >>>>>> >>>>>> ffffffff813d050f 000000000000000d 0000000000000045 ffff880f79df8000 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685426] >>>>>> >>>>>> 000000000000033f 0000000000000000 0000000000016b00 000000000000033f >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685477] >>>>>> >>>>>> ffff880f79df8000 ffff880f79fbb8b8 00000000000001f4 0000000000000054 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685528] Call Trace: >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685555] >>>>>> >>>>>> [<ffffffff813d050f>] ? cpumask_next_and+0x2f/0x40 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685584] >>>>>> >>>>>> [<ffffffff810b4a6e>] task_numa_migrate+0x43e/0x9b0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685613] >>>>>> >>>>>> [<ffffffff810b3acc>] ? update_cfs_shares+0xbc/0x100 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685642] >>>>>> >>>>>> [<ffffffff810b5059>] numa_migrate_preferred+0x79/0x80 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685672] >>>>>> >>>>>> [<ffffffff810b9b94>] task_numa_fault+0x7f4/0xd40 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685700] >>>>>> >>>>>> [<ffffffff813d9634>] ? timerqueue_del+0x24/0x70 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685729] >>>>>> >>>>>> [<ffffffff810b9205>] ? should_numa_migrate_memory+0x55/0x130 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685762] >>>>>> >>>>>> [<ffffffff811bd590>] handle_mm_fault+0xbc0/0x1820 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685793] >>>>>> >>>>>> [<ffffffff810edc00>] ? __hrtimer_init+0x90/0x90 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685822] >>>>>> >>>>>> [<ffffffff810c211d>] ? remove_wait_queue+0x4d/0x60 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685853] >>>>>> >>>>>> [<ffffffff8121e20a>] ? poll_freewait+0x4a/0xa0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685882] >>>>>> >>>>>> [<ffffffff8106a537>] __do_page_fault+0x197/0x400 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685910] >>>>>> >>>>>> [<ffffffff8106a7c2>] do_page_fault+0x22/0x30 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685939] >>>>>> >>>>>> [<ffffffff8180a878>] page_fault+0x28/0x30 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685967] >>>>>> >>>>>> [<ffffffff813e4c5f>] ? copy_page_to_iter_iovec+0x5f/0x300 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.685997] >>>>>> >>>>>> [<ffffffff810b2795>] ? select_task_rq_fair+0x625/0x700 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686026] >>>>>> >>>>>> [<ffffffff813e4f16>] copy_page_to_iter+0x16/0xa0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686056] >>>>>> >>>>>> [<ffffffff816f02ad>] skb_copy_datagram_iter+0x14d/0x280 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686087] >>>>>> >>>>>> [<ffffffff8174a503>] tcp_recvmsg+0x613/0xbe0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686117] >>>>>> >>>>>> [<ffffffff8177844e>] inet_recvmsg+0x7e/0xb0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686146] >>>>>> >>>>>> [<ffffffff816e0d3b>] sock_recvmsg+0x3b/0x50 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686173] >>>>>> >>>>>> [<ffffffff816e0f91>] SYSC_recvfrom+0xe1/0x160 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686202] >>>>>> >>>>>> [<ffffffff810f36f5>] ? ktime_get_ts64+0x45/0xf0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686230] >>>>>> >>>>>> [<ffffffff816e239e>] SyS_recvfrom+0xe/0x10 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686259] >>>>>> >>>>>> [<ffffffff818086f2>] entry_SYSCALL_64_fastpath+0x16/0x71 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686287] Code: 55 b0 4c >>>>>> >>>>>> 89 f7 e8 53 cd ff ff 48 8b 55 b0 49 8b 4e 78 48 8b 82 d8 01 00 00 48 >>>>>> >>>>>> 83 c1 01 31 d2 49 0f af 86 b0 00 00 00 4c 8b 73 78 <48> f7 f1 48 8b 4b >>>>>> >>>>>> 20 49 89 c0 48 29 c1 48 8b 45 d0 4c 03 43 48 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686512] RIP >>>>>> >>>>>> [<ffffffff810b416e>] task_numa_find_cpu+0x22e/0x6f0 >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686544] RSP >>>>>> <ffff880f79fbb818> >>>>>> >>>>>> Jun 28 09:46:41 roc04r-sca090 kernel: [137912.686896] ---[ end trace >>>>>> >>>>>> 544cb9f68cb55c93 ]--- >>>>>> >>>>>> Jun 28 09:52:15 roc04r-sca090 kernel: [138246.669713] mpt2sas_cm0: >>>>>> >>>>>> log_info(0x30030101): originator(IOP), code(0x03), sub_code(0x0101) >>>>>> >>>>>> Jun 28 09:55:01 roc0 >>>>>> >>>>>> _______________________________________________ >>>>>> >>>>>> ceph-users mailing list >>>>>> >>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>> >>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>>>> >>>>>> >>>>>> >>>>>> Tim. >>>>>> >>>>>> -- >>>>>> Tim Bishop >>>>>> http://www.bishnet.net/tim/ >>>>>> PGP Key: 0x6C226B37FDF38D55 >>>>>> >>>>>> _______________________________________________ >>>>>> ceph-users mailing list >>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>> _______________________________________________ >>>> ceph-users mailing list >>>> ceph-users@xxxxxxxxxxxxxx >>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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