the cause are some smbd processes in state D
the block happens randomly with a frequency of about 3 months.

----------------------------------------------------------------

*«L'immaginazione è più importante della conoscenza.» - Albert
Einstein.*


*Alberto M.Fiaschi*


*http://it.linkedin.com/pub/alberto-fiaschi
<http://it.linkedin.com/pub/alberto-fiaschi/38/783/a5> *

2018-04-12 19:01 GMT+02:00 Colin Ian King <1722...@bugs.launchpad.net>:

> Is this still and issue for you?
>
> You may be able to identify the processes that are causing the problem
> using the fuser command, e.g. on mounted zfs file system /poolname use:
>
> fuser -vm /poolname
>
> maybe that helps.
>
>
>
> ** Changed in: zfs-linux (Ubuntu)
>        Status: New => Incomplete
>
> ** Changed in: zfs-linux (Ubuntu)
>    Importance: Undecided => Low
>
> ** Changed in: zfs-linux (Ubuntu)
>      Assignee: (unassigned) => Colin Ian King (colin-king)
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> 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
>

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https://bugs.launchpad.net/bugs/1722261

Title:
  deadlock in mount umount and sync

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