Public bug reported: Server's load become high with tasks in D state, no choice but to reboot the system. Could be related to the following ? :
https://bugzilla.kernel.org/show_bug.cgi?id=119841 https://www.redhat.com/archives/dm-devel/2016-June/msg00399.html https://patchwork.kernel.org/patch/9223697/ https://xen.crc.id.au/bugs/view.php?id=75 ii xen-hypervisor-4.4-amd64 4.4.2-0ubuntu0.14.04.7 amd64 Xen Hypervisor on AMD64 ii linux-image-extra-4.4.0-47-generic 4.4.0-47.68~14.04.1 amd64 Linux kernel extra modules for version 4.4.0 on 64 bit x86 SMP ii linux-image-4.4.0-47-generic 4.4.0-47.68~14.04.1 amd64 Linux kernel image for version 4.4.0 on 64 bit x86 SMP kernel messages: ---------------- [890070.994700] INFO: task blkback.3.xvda2:5756 blocked for more than 120 seconds. [890070.994758] Not tainted 4.4.0-47-generic #68~14.04.1-Ubuntu [890070.994806] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [890070.994884] blkback.3.xvda2 D ffff8800b7ff3928 0 5756 2 0x00000000 [890070.994890] ffff8800b7ff3928 ffffffff81e13500 ffff8800b6a4be80 ffff8800b7ff4000 [890070.994895] ffff88013a83cc18 ffff88013a83cc00 ffffffff00000000 fffffffe00000001 [890070.994898] ffff8800b7ff3940 ffffffff817fafc5 ffff8800b6a4be80 ffff8800b7ff39c0 [890070.994902] Call Trace: [890070.994912] [<ffffffff817fafc5>] schedule+0x35/0x80 [890070.994917] [<ffffffff817fd46a>] rwsem_down_write_failed+0x1da/0x320 [890070.994923] [<ffffffff81689577>] ? push+0x47/0x50 [890070.994927] [<ffffffff81689f07>] ? dm_kcopyd_copy+0x147/0x1f0 [890070.994931] [<ffffffff813e6a53>] call_rwsem_down_write_failed+0x13/0x20 [890070.994933] [<ffffffff817fcd7d>] ? down_write+0x2d/0x40 [890070.994939] [<ffffffffc0314dae>] __origin_write+0x6e/0x210 [dm_snapshot] [890070.994944] [<ffffffff81185625>] ? mempool_alloc_slab+0x15/0x20 [890070.994946] [<ffffffff8118574f>] ? mempool_alloc+0x5f/0x150 [890070.994949] [<ffffffffc0314fb7>] do_origin.isra.14+0x67/0x90 [dm_snapshot] [890070.994952] [<ffffffffc0315042>] origin_map+0x62/0x80 [dm_snapshot] [890070.994955] [<ffffffff8167f2da>] __map_bio+0x3a/0x110 [890070.994957] [<ffffffff816809c0>] __split_and_process_bio+0x240/0x3c0 [890070.994960] [<ffffffff81680baa>] dm_make_request+0x6a/0xd0 [890070.994964] [<ffffffff813aa221>] generic_make_request+0xe1/0x1a0 [890070.994968] [<ffffffff813aa357>] submit_bio+0x77/0x150 [890070.994971] [<ffffffff813a1c71>] ? bio_alloc_bioset+0x181/0x2a0 [890070.994977] [<ffffffffc02c6a1d>] dispatch_rw_block_io+0x4fd/0x9b0 [xen_blkback] [890070.994981] [<ffffffff8101c244>] ? xen_load_sp0+0x84/0x180 [890070.994985] [<ffffffffc02c70c5>] __do_block_io_op+0x1f5/0x650 [xen_blkback] [890070.994990] [<ffffffff810e5e18>] ? del_timer_sync+0x48/0x50 [890070.994993] [<ffffffff817fd8ab>] ? schedule_timeout+0x16b/0x2d0 [890070.994997] [<ffffffffc02c7880>] xen_blkif_schedule+0xd0/0x820 [xen_blkback] [890070.995002] [<ffffffff810a4e1a>] ? finish_task_switch+0x7a/0x290 [890070.995004] [<ffffffff817fa969>] ? __schedule+0x359/0x980 [890070.995010] [<ffffffff810bde70>] ? prepare_to_wait_event+0xf0/0xf0 [890070.995014] [<ffffffffc02c77b0>] ? xen_blkif_be_int+0x30/0x30 [xen_blkback] [890070.995018] [<ffffffff8109ba29>] kthread+0xc9/0xe0 [890070.995021] [<ffffffff8109b960>] ? kthread_park+0x60/0x60 [890070.995025] [<ffffffff817febcf>] ret_from_fork+0x3f/0x70 [890070.995027] [<ffffffff8109b960>] ? kthread_park+0x60/0x60 ** Affects: linux-lts-xenial (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1645187 Title: 4.4.0-47-generic dm_snapshot random deadlock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-lts-xenial/+bug/1645187/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
