** Attachment added: "dmesg" https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1820001/+attachment/5245981/+files/dmesg-part.txt
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lvm2 in Ubuntu. https://bugs.launchpad.net/bugs/1820001 Title: vgcfgbackup stuck in kernel, causing lvm and udevd block forever Status in lvm2 package in Ubuntu: New Bug description: Hello I am using lvm snapshots over sofware raid with 4 devices for rsync backups. Recently I found out that it is stuck and any operaton with lvm is stuck as well. This also causes 1000+ processes of systemd-udevd to be in interpretable sleep and cannot be killed. My backup script looks like this: /sbin/vgcfgbackup -qq main /sbin/lvcreate -qq --size 20G --snapshot --name backup /dev/mapper/main-root mount /dev/mapper/main-backup /mnt/root_snapshot *rsync stuff* umount /mnt/root_snapshot /sbin/lvremove -yqq /dev/mapper/main-backup Launching as not root `pvs --unbuffered --readonly -t -vvvv` is stuck at: #filters/filter-persistent.c:51 Wiping cache of LVM-capable devices Launching as not root `lvs -vvvv --unbuffered --readonly -vvvv` us stuck at: #toollib.c:3736 Get list of VGs on system I have a lot of processes stucked (total number ~1000): root 756 0.0 0.0 56400 8428 ? D фев26 0:00 /sbin/vgcfgbackup -qq main root 21723 0.0 0.0 36940 1860 ? D мар13 0:00 /lib/systemd/systemd-udevd root 21724 0.0 0.0 36940 1808 ? D мар13 0:00 /lib/systemd/systemd-udevd root 21728 0.0 0.0 36940 1808 ? D мар13 0:00 /lib/systemd/systemd-udevd root 14541 0.0 0.0 7780 2524 ? D 06:25 0:00 /sbin/mdadm --monitor --scan --oneshot root 8792 0.0 0.0 56548 8308 ? D 05:59 0:00 lvs root 11343 0.0 0.0 119424 7632 ? S 06:10 0:00 sudo lvs -vd admin 12112 0.0 0.0 56596 8368 ? D 06:14 0:00 lvs -vvvv -dddddd --readonly -t --unbuffered In dmesg I have following logs: [16983388.190818] general protection fault: 0000 [#41] SMP PTI [16987988.464353] general protection fault: 0000 [#42] SMP PTI In system journal: Mar 14 06:47:35 - systemd[1]: systemd-udevd.service: Found left-over process 17886 (systemd-udevd) in control group while starting unit. Ignoring. Mar 14 06:47:35 - systemd[1]: This usually indicates unclean termination of a previous run, or service implementation deficiencies. Mar 14 06:47:35- systemd[1]: systemd-udevd.service: Found left-over process 17887 (systemd-udevd) in control group while starting unit. Ignoring. Mar 14 06:50:28 - systemd-udevd[20282]: seq 1116768 '/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda/sda1' is taking a long time Mar 14 06:50:28 - systemd-udevd[20282]: seq 1116780 '/devices/pci0000:00/0000:00:1f.2/ata2/host1/target1:0:1/1:0:1:0/block/sdc/sdc1' is taking a long time lvmdump hangs at `Gathering /dev listening`, but I was able to terminate it. mdstat: md0 : active raid10 sdb1[1] sdc1[2] sda1[0] sdd1[3] 1953259520 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU] bitmap: 1/15 pages [4KB], 65536KB chunk OS: Ubuntu 18.04.1 LTS Kernel: 4.15.0-29-generic lvm2: 2.02.176-4.1ubuntu3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lvm2/+bug/1820001/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
