On Sun, Jul 3, 2016 at 7:51 AM, Alex Gorbachev <ag@xxxxxxxxxxxxxxxxxxx> wrote: >> 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? OSD code is not compiled against any kernel code. ceph-osd runs in userpace, not kernelspace. A userspace process should not be able to crash a kernel, if it can that's a kernel bug. HTH, Brad > >> >> 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 -- Cheers, Brad _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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