fsck_ufs -B lockup any writes on filesystem

[Robert Watson]

On Wed, 15 Oct 2003, Vladimir B. Grebenschikov wrote:

> After unclean shutdown, system boots and work properly. After some time
> any processes triing to write was blocked in suspfs state.  fsck_ufs
> process was blocked in suspwt state. 

I reported an identical set of symptoms over the weekend to Kirk and Jeff,
and a fix was committed as src/sys/kerne/vfs_bio.c:1.412.  A missing write
lock release in buffer cache locking work would leave the disk suspended
for writes, and the result is a file system deadlock just as you describe. 
Could you check and see which version of vfs_bio.c you're running with --
if it's the earlier version, try updating?  If it's the newer version,
please let me know.  Here's the commit message: 

Date: Mon, 13 Oct 2003 17:38:35 -0700 (PDT)
From: Jeff Roberson <jeff at FreeBSD.org>
To: src-committers at FreeBSD.org, cvs-src at FreeBSD.org, cvs-all at FreeBSD.org
Subject: cvs commit: src/sys/kern vfs_bio.c
 
jeff        2003/10/13 17:38:35 PDT
 
  FreeBSD src repository
 
  Modified files:
    sys/kern             vfs_bio.c
  Log:
   - Add a mising vn_finished_write()
 
  Pointy hat:     jeff
  Found by:       robert
  Obtained from:  kirk
 
  Revision  Changes    Path
  1.412     +1 -0      src/sys/kern/vfs_bio.c



> 
> Killing blocked processes does not helps.
> 
> # ps alx | fgrep fsck_ufs
>     0   917   736   0  75  0   676  268 suspwt D     ??    0:00.91
> fsck_ufs -p -B /dev/ad0s3f
> 
> # strace -p 917
> mount(0x80af3d3, 0x80cb44c, 0x1211000, 0xbfbffcc0^C <unfinished ...>
> ^C
> 
> # ps alx | fgrep suspfs
>     0   559     1   0  75  0  7076 1588  suspfs Is    ??    0:01.92
> /usr/local/sbin/cupsd
>   207   611   609   0  75  0  8832 2396  suspfs I     ??    0:00.11
> /usr/X11R6/bin/gdm-binary
>   207   836     1   0  75  0 18000 9108  suspfs I     ??    0:02.33
> /usr/X11R6/libexec/stickynotes_applet
>   207   865     1   2  75  0 55932 41028 suspfs I     ??    1:59.49
> evolution-1.4
>   207   867     1   0  75  0 32296 16000 suspfs I     ??    0:22.15
> /usr/X11R6/share/opera/bin/opera --bi
>   207   942     1   0  75  0  4120 2068  suspfs I     p0-   0:00.04 licq
> 
> I can cure situation only be running fsck -y in single-user mode.
> 
> PR: kern/58060
> 
> -- 
> Vladimir B. Grebenschikov <vova at sw.ru>
> SWsoft Inc.
> 
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