kern/94769: [ufs] Multiple file deletions on multi-snapshotted filesystems causes hang

[Kostik Belousov]

On Mon, May 04, 2009 at 08:30:03PM +0000, Doug Poland wrote:
> The following reply was made to PR kern/94769; it has been noted by GNATS.
> 
> From: Doug Poland <doug at polands.org>
> To: bug-followup at FreeBSD.org, john at kozubik.com
> Cc:  
> Subject: Re: kern/94769: [ufs] Multiple file deletions on multi-snapshotted
> 	filesystems causes hang
> Date: Mon, 4 May 2009 15:11:33 -0500
> 
>  I recently started experiencing similar behavior on a 7.1-RELEASE i386
>  host.  In this case the deadlock occurs as soon as
>  sysutils/freebsd-snapshots run it's weekly cron entry:
>  
>  0   *   *   *   *   root    periodic-snapshot hourly
>  0   0   *   *   *   root    periodic-snapshot daily
>  0   0   *   *   0   root    periodic-snapshot weekly
>  
>  I am running a GENERIC kernel without quotas.
>  
>  Here's the list of snapshots on the various filesystems:
>  
>  Filesystem          User   User%     Snap   Snap%  Snapshot
>  /                  267MB   54.0%    704KB    0.1%  daily.0
>  /                  267MB   54.0%    704KB    0.1%  daily.1
>  /                  267MB   54.0%    704KB    0.1%  daily.2
>  /                  267MB   54.0%    704KB    0.1%  daily.3
>  /                  267MB   54.0%    704KB    0.1%  daily.4
>  /                  267MB   54.0%    784KB    0.2%  daily.5
>  /                  267MB   54.0%    784KB    0.2%  daily.6
>  /                  267MB   54.0%    608KB    0.1%  hourly.0
>  /                  267MB   54.0%    640KB    0.1%  hourly.1
>  /                  267MB   54.0%    656KB    0.1%  hourly.2
>  /                  267MB   54.0%    656KB    0.1%  hourly.3
>  /                  267MB   54.0%    704KB    0.1%  weekly.0
>  /                  267MB   54.0%    896KB    0.2%  weekly.1
>  /                  267MB   54.0%    928KB    0.2%  weekly.2
>  /                  267MB   54.0%      1MB    0.2%  weekly.3
>  /var              1237MB   10.4%     16MB    0.1%  daily.0
>  /var              1237MB   10.4%     17MB    0.1%  daily.1
>  /var              1237MB   10.4%     30MB    0.3%  daily.2
>  /var              1237MB   10.4%     32MB    0.3%  daily.3
>  /var              1237MB   10.4%     32MB    0.3%  daily.4
>  /var              1237MB   10.4%     33MB    0.3%  daily.5
>  /var              1237MB   10.4%    141MB    1.2%  daily.6
>  /var              1237MB   10.4%      7MB    0.1%  hourly.0
>  /var              1237MB   10.4%      7MB    0.1%  hourly.1
>  /var              1237MB   10.4%      7MB    0.1%  hourly.2
>  /var              1237MB   10.4%      8MB    0.1%  hourly.3
>  /var              1237MB   10.4%      8MB    0.1%  hourly.4
>  /var              1237MB   10.4%      8MB    0.1%  hourly.5
>  /var              1237MB   10.4%      8MB    0.1%  hourly.6
>  /var              1237MB   10.4%      8MB    0.1%  hourly.7
>  /var              1237MB   10.4%      8MB    0.1%  hourly.8
>  /var              1237MB   10.4%      8MB    0.1%  hourly.9
>  /var              1237MB   10.4%     25MB    0.2%  weekly.0
>  /usr             87545MB   74.1%    138MB    0.1%  daily.0
>  /usr             87545MB   74.1%    217MB    0.2%  daily.1
>  /usr             87545MB   74.1%    234MB    0.2%  daily.2
>  /usr             87545MB   74.1%    287MB    0.2%  daily.3
>  /usr             87545MB   74.1%    292MB    0.2%  daily.4
>  /usr             87545MB   74.1%    278MB    0.2%  daily.5
>  /usr             87545MB   74.1%    349MB    0.3%  daily.6
>  /usr             87545MB   74.1%     88MB    0.1%  hourly.0
>  /usr             87545MB   74.1%    200MB    0.2%  hourly.1
>  /usr             87545MB   74.1%    864MB    0.7%  weekly.0
>  /usr             87545MB   74.1%    721MB    0.6%  weekly.1
>  /usr             87545MB   74.1%    782MB    0.7%  weekly.2
>  /usr             87545MB   74.1%   4772MB    4.0%  weekly.3
>  
>  I am eager and willing to assist in anyway to investigate and eliminate
>  this issue.
Try today stable/7 after the r190690.
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