From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shaohua Li Subject: Re: INFO: task systemd-udevd:794 blocked for more than 600 seconds observed after mdadm -G operation Date: Fri, 5 Aug 2016 21:45:55 -0700 Message-ID: <20160806044555.GC9281@kernel.org> References: <1363340670.11420734.1470326479339.JavaMail.zimbra@redhat.com> <57A434A9.2020501@suse.com> <40d28573-38a6-25ad-7956-95bd0c74b996@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <40d28573-38a6-25ad-7956-95bd0c74b996@redhat.com> Sender: linux-raid-owner@vger.kernel.org To: yizhan Cc: Guoqing Jiang , linux-raid@vger.kernel.org, shli@fb.com, NeilBrown , songliubraving@fb.com List-Id: linux-raid.ids On Fri, Aug 05, 2016 at 03:05:40PM +0800, yizhan wrote: > > > On 08/05/2016 02:39 PM, Guoqing Jiang wrote: > > > > > >On 08/04/2016 12:01 PM, Yi Zhang wrote: > > > >>[ 1201.734199] INFO: task systemd-udevd:794 blocked for more than 600 > >>seconds. > >>[ 1201.734204] Not tainted 4.7.0 #5 > >>[ 1201.734204] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > >>disables this message. > >>[ 1201.734206] systemd-udevd D ffff8800310a77b0 0 794 1 > >>0x00000000 > >>[ 1201.734209] ffff8800310a77b0 0000000000000001 ffff880031de0000 > >>ffff8807cd3c5688 > >>[ 1201.734211] ffff8800310a8000 0000000000000000 0000000000000002 > >>ffff8807c3e4c100 > >>[ 1201.734213] 0000000000000000 ffff8800310a77c8 ffffffff816e4935 > >>ffff8807cd3c5400 > >>[ 1201.734214] Call Trace: > >>[ 1201.734220] [] schedule+0x35/0x80 > >>[ 1201.734226] [] raid5_make_request+0x8b9/0xce0 > >>[raid456] > >>[ 1201.734229] [] ? prepare_to_wait_event+0xf0/0xf0 > >>[ 1201.734233] [] md_make_request+0xee/0x230 > >>[ 1201.734236] [] generic_make_request+0x103/0x1d0 > >>[ 1201.734237] [] submit_bio+0x77/0x150 > >>[ 1201.734240] [] ? bio_alloc_bioset+0x1ab/0x2d0 > >>[ 1201.734242] [] ? alloc_page_buffers+0x5d/0xb0 > >>[ 1201.734244] [] submit_bh_wbc+0x12f/0x160 > >>[ 1201.734246] [] block_read_full_page+0x208/0x380 > >>[ 1201.734248] [] ? I_BDEV+0x20/0x20 > >>[ 1201.734250] [] blkdev_readpage+0x18/0x20 > >>[ 1201.734253] [] do_read_cache_page+0x138/0x300 > >>[ 1201.734255] [] ? blkdev_writepages+0x40/0x40 > >>[ 1201.734257] [] read_cache_page+0x19/0x20 > >>[ 1201.734259] [] read_dev_sector+0x80/0xb0 > >>[ 1201.734261] [] read_lba+0x104/0x1c0 > >>[ 1201.734263] [] find_valid_gpt+0xfa/0x710 > >>[ 1201.734266] [] ? > >>vmap_page_range_noflush+0x190/0x380 > >>[ 1201.734267] [] ? find_valid_gpt+0x710/0x710 > >>[ 1201.734269] [] efi_partition+0x89/0x440 > >>[ 1201.734271] [] ? snprintf+0x49/0x70 > >>[ 1201.734273] [] ? find_valid_gpt+0x710/0x710 > >>[ 1201.734275] [] check_partition+0x101/0x1f0 > >>[ 1201.734277] [] rescan_partitions+0xc2/0x2c0 > >>[ 1201.734279] [] __blkdev_reread_part+0x64/0x70 > >>[ 1201.734281] [] blkdev_reread_part+0x23/0x40 > >>[ 1201.734282] [] blkdev_ioctl+0x46a/0x8f0 > >>[ 1201.734284] [] block_ioctl+0x41/0x50 > >>[ 1201.734286] [] do_vfs_ioctl+0xa6/0x5c0 > >>[ 1201.734288] [] SyS_ioctl+0x79/0x90 > >>[ 1201.734290] [] ? SyS_flock+0x117/0x1a0 > >>[ 1201.734292] [] entry_SYSCALL_64_fastpath+0x1a/0xa4 > >>[ 1201.734305] INFO: task md0_reshape:4089 blocked for more than 600 > >>seconds. > >>[ 1201.734306] Not tainted 4.7.0 #5 > >>[ 1201.734307] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > >>disables this message. > >>[ 1201.734308] md0_reshape D ffff88080db77ac0 0 4089 2 > >>0x00000080 > >>[ 1201.734310] ffff88080db77ac0 0000000000000000 ffff8807d6724380 > >>ffff8807cd3c5670 > >>[ 1201.734311] ffff88080db78000 ffff88080db77b20 ffff8807cd3c5670 > >>0000000000000c20 > >>[ 1201.734313] ffff8807cd3c5418 ffff88080db77ad8 ffffffff816e4935 > >>ffff8807cd3c5400 > >>[ 1201.734314] Call Trace: > >>[ 1201.734316] [] schedule+0x35/0x80 > >>[ 1201.734319] [] raid5_get_active_stripe+0x20b/0x670 > >>[raid456] > >>[ 1201.734321] [] ? prepare_to_wait_event+0xf0/0xf0 > >>[ 1201.734323] [] reshape_request+0x4d3/0x8a0 > >>[raid456] > >>[ 1201.734326] [] raid5_sync_request+0x321/0x3a0 > >>[raid456] > >>[ 1201.734327] [] ? __wake_up+0x44/0x50 > >>[ 1201.734329] [] md_do_sync+0x9e7/0xf60 > >>[ 1201.734332] [] ? update_curr+0xed/0x180 > >>[ 1201.734333] [] ? account_entity_dequeue+0xae/0xd0 > >>[ 1201.734336] [] ? kernel_sigaction+0x43/0xe0 > >>[ 1201.734339] [] md_thread+0x136/0x150 > >>[ 1201.734341] [] ? find_pers+0x70/0x70 > >>[ 1201.734343] [] kthread+0xd8/0xf0 > >>[ 1201.734344] [] ret_from_fork+0x1f/0x40 > >>[ 1201.734346] [] ? kthread_park+0x60/0x60 > >> > >> > >>Reproduce steps: > >> > >>#mdadm -CR /dev/md0 -l5 -n4 /dev/sd[b-e]1 --write-journal /dev/sdf1 > >>#mdadm --wait /dev/md0 > >>#mdadm /dev/md0 -f /dev/sdf1 > >>#mdadm /dev/md0 -r /dev/sdf1 > >>#mdadm /dev/md0 -a /dev/sdf1 > >>#mdadm -D /dev/md0 > >>/dev/md0: > >> Version : 1.2 > >> Creation Time : Thu Aug 4 20:37:41 2016 > >> Raid Level : raid5 > >> Array Size : 31432704 (29.98 GiB 32.19 GB) > >> Used Dev Size : 10477568 (9.99 GiB 10.73 GB) > >> Raid Devices : 4 > >> Total Devices : 5 > >> Persistence : Superblock is persistent > >> > >> Update Time : Thu Aug 4 20:40:16 2016 > >> State : clean > >> Active Devices : 4 > >>Working Devices : 5 > >> Failed Devices : 0 > >> Spare Devices : 1 > >> > >> Layout : left-symmetric > >> Chunk Size : 512K > >> > >> Name : dhcp-12-125.nay.redhat.com:0 (local to host > >>dhcp-12-125.nay.redhat.com) > >> UUID : 09607542:a8dccc81:f5d2f80c:c586923f > >> Events : 22 > >> > >> Number Major Minor RaidDevice State > >> 0 8 17 0 active sync /dev/sdb1 > >> 1 8 33 1 active sync /dev/sdc1 > >> 2 8 49 2 active sync /dev/sdd1 > >> 5 8 65 3 active sync /dev/sde1 > >> > >> 4 8 81 - spare /dev/sdf1 > >> > >>#mdadm -G -n5 /dev/md0 > > > >Also with 4.7+, I can't find the same issue, but md0_reshape is in 'D' > >state from my side > >(actually I can't find reshape is in-progress by 'cat /proc/mdstat'). > > > Hi guoqing > Thanks for you detailed log. > The trace cannot be print soon, I think you need wait for more time, the > time from below is more than 15m. > Aug 4 20:39:37 dhcp-12-125 kernel: md/raid:md0: Disk failure on sdf1, > disabling device.#012md/raid:md0: Operation continuing on 4 devices. > Aug 4 20:39:56 dhcp-12-125 kernel: md: unbind > Aug 4 20:39:56 dhcp-12-125 kernel: md: export_rdev(sdf1) > Aug 4 20:40:16 dhcp-12-125 kernel: md: bind > Aug 4 20:40:47 dhcp-12-125 kernel: md: reshape of RAID array md0 > Aug 4 20:40:47 dhcp-12-125 kernel: md: minimum _guaranteed_ speed: 1000 > KB/sec/disk. > Aug 4 20:40:47 dhcp-12-125 kernel: md: using maximum available idle IO > bandwidth (but not more than 200000 KB/sec) for reshape. > Aug 4 20:40:47 dhcp-12-125 kernel: md: using 128k window, over a total of > 10477568k > Aug 4 20:55:56 dhcp-12-125 kernel: INFO: task systemd-udevd:794 blocked for > more than 600 seconds. Adding Song who knows a lot in this side. If an array is created with journal and journal disk fails, we will make the array read-only. So we should disable reshape too. Likely we have a bug here. Thanks, Shaohua