fsck_ufs locked in snaplk

[Kris Kennaway]

On Tue, Apr 25, 2006 at 12:24:07AM +0400, Dmitry Morozovsky wrote:
> On Mon, 24 Apr 2006, Kris Kennaway wrote:
> 
> KK> > What bothers me most is that it is the only machine reproducibly hangs in 
> KK> > snapshots, and it did not hang before RELENG_5 -> RELENG_6 upgrade. Other 
> KK> > RELENG_6 machines do snapshot backups flawlessly (knock-on-wood!)
> KK> 
> KK> Are you quite certain it's running up-to-date RELENG_6_1?  All known
> KK> snapshot deadlock issues were believed to have been fixed a few weeks
> KK> ago.  If so, we might need you to enable extra debugging to track this
> KK> down.
> 
> Yes, I'm sure it's recent RELENG_6_1:
> 
> marck at office:/usr/src> cvs stat sys/ufs/ffs/ffs_snapshot.c 
> ===================================================================
> File: ffs_snapshot.c    Status: Up-to-date
> 
>    Working revision:    1.103.2.5
>    Repository revision: 1.103.2.5       /home/ncvs/src/sys/ufs/ffs/ffs_snapshot.c,v
>    Sticky Tag:          RELENG_6_1 (branch: 1.103.2.5.2)
>    Sticky Date:         (none)
>    Sticky Options:      (none)
> 
> marck at office:/usr/src> cvs -R up
> P etc/rc.d/SERVERS
> P release/doc/en_US.ISO8859-1/errata/article.sgml
> P release/doc/en_US.ISO8859-1/relnotes/common/new.sgml
> P release/doc/share/sgml/release.ent
> P release/doc/zh_CN.GB2312/errata/article.sgml
> P release/doc/zh_CN.GB2312/relnotes/common/new.sgml
> P sys/amd64/amd64/identcpu.c
> P sys/amd64/amd64/initcpu.c
> P sys/amd64/amd64/pmap.c
> P sys/amd64/include/md_var.h
> P sys/amd64/include/specialreg.h
> P sys/i386/i386/identcpu.c
> P sys/i386/i386/initcpu.c
> P sys/i386/include/md_var.h
> P sys/i386/include/specialreg.h
> P sys/ia64/ia64/nexus.c
> 
> (all these changes are non-relevant, are they?)

Yes.

> I'll try to build DDB kernel tomorrow evening to check. Which commands should I 
> issue in ddb ?

'show lockedvnods', 'ps' and 'alltrace' are important.

Kris
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