Couple of things: 1. Next time this occurs, can you run the following command and paste the output into the bug report:
sudo zpool events -v That may provide some additional information on what state the IOs are in. 2. If you are using ZFS intent log, it may be worth trying to set it to a fairly large size, such as 128 or 256MB using the zil_slog_limit setting -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to zfs-linux in Ubuntu. https://bugs.launchpad.net/bugs/1722261 Title: deadlock in mount umount and sync Status in zfs-linux package in Ubuntu: Incomplete Bug description: I use zfs vesion 0.6.5.6 on Ubuntu 16.04.2 LTS . I have many zombie process on auto-mount of snapshot and on sync ! 903 process are in deadlock. i can't mount a new file system or snapshot . Partial output of ps alx |grep 'call_r D' below . what is the cause? what can I do ? 0 0 2371 1 20 0 6016 752 call_r D ? 0:00 /bin/sync 0 0 15290 1 20 0 6016 676 call_r D ? 0:00 /bin/sync 0 0 18919 1 20 0 6016 708 call_r D ? 0:00 /bin/sync 0 0 27076 1 20 0 6016 808 call_r D ? 0:00 /bin/sync 4 0 31976 1 20 0 22084 1344 call_r D ? 0:00 umount -t zfs -n /samba/shares/Aat/.zfs/snapshot/2017-10-04_09.00.05--5d error in kern.log: 9 13:20:28 zfs-cis kernel: [5368563.592834] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_08.00.03--5d/pool_z2_samba/shares/Trapianti@2017-10-03_08.00.03--5d: 256 Oct 9 13:20:28 zfs-cis kernel: [5368563.597868] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_08.00.03--5d/pool_z2_samba/shares/Trapianti@2017-10-03_08.00.03--5d: 256 Oct 9 13:20:28 zfs-cis kernel: [5368563.601730] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_08.00.03--5d/pool_z2_samba/shares/Trapianti@2017-10-03_08.00.03--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.187001] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_10.00.03--5d/pool_z2_samba/shares/Trapianti@2017-10-03_10.00.03--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.188883] WARNING: Unable to automount /samba/shares/Cardiologia2/.zfs/snapshot/2017-10-03_12.00.03--5d/pool_z2_samba/shares/Cardiologia2@2017-10-03_12.00.03--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.188885] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_14.00.04--5d/pool_z2_samba/shares/Trapianti@2017-10-03_14.00.04--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.189005] WARNING: Unable to automount /samba/shares/Aat/.zfs/snapshot/2017-10-03_20.00.04--5d/pool_z2_samba/shares/Aat@2017-10-03_20.00.04--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.190105] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_10.00.03--5d/pool_z2_samba/shares/Trapianti@2017-10-03_10.00.03--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.192847] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_10.00.03--5d/pool_z2_samba/shares/Trapianti@2017-10-03_10.00.03--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.193617] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_14.00.04--5d/pool_z2_samba/shares/Trapianti@2017-10-03_14.00.04--5d: 256 Oct 9 13:22:57 zfs-cis kernel: [5368713.198096] WARNING: Unable to automount /samba/shares/Trapianti/.zfs/snapshot/2017-10-03_14.00.04--5d/pool_z2_samba/shares/Trapianti@2017-10-03_14.00.04--5d: 256 in syslog : Oct 9 12:22:12 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dChtrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=155 reply_cookie=0 error=n/a Oct 9 12:22:12 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dLaboratorio_5fTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=202 reply_cookie=0 error=n/a Oct 9 12:22:12 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dProgettoTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=260 reply_cookie=0 error=n/a Oct 9 12:22:12 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=291 reply_cookie=0 error=n/a Oct 9 12:22:13 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dChtrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=155 reply_cookie=0 error=n/a Oct 9 12:22:13 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dLaboratorio_5fTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=202 reply_cookie=0 error=n/a Oct 9 12:22:13 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dProgettoTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=260 reply_cookie=0 error=n/a Oct 9 12:22:13 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=291 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dChtrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=155 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dLaboratorio_5fTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=202 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dProgettoTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=260 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=291 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dChtrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=155 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dLaboratorio_5fTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=202 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dProgettoTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=260 reply_cookie=0 error=n/a Oct 9 12:22:14 zfs-cis systemd[1]: Got message type=method_call sender=n/a destination=org.freedesktop.systemd1 object=/org/freedesktop/systemd1/unit/samba_2dshares_2dTrapianti_2emount interface=org.freedesktop.DBus.Properties member=GetAll cookie=291 reply_cookie=0 error=n/a To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1722261/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
