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Date: Fri, 12 Nov 2010 14:13:19 +0200
From: Andriy Gapon <avg@freebsd.org>
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To: Alexander Zagrebin <alexz@visp.ru>
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Cc: freebsd-fs@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: 8.1-STABLE: problem with unmounting ZFS snapshots
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on 12/11/2010 13:57 Alexander Zagrebin said the following:
> 2. the umount is waiting for disk
> #ps | egrep 'PID|umount'
>   PID  TT  STAT      TIME COMMAND
>   958   0  D+     0:00,04 umount /mnt
> # procstat -t 958
>   PID    TID COMM             TDNAME           CPU  PRI STATE   WCHAN
>   958 100731 umount           -                  3  133 sleep   mntref

procstat -kk <pid>

> Can anybody confirm this issue?
> Any suggestions?
> 

ktrace-ing umount could also be useful.

-- 
Andriy Gapon