Ufs dead-locks on freebsd 6.2

Kris Kennaway kris at obsecurity.org
Wed May 16 16:33:07 UTC 2007

On Wed, May 16, 2007 at 12:08:24PM -0400, Andrew Edwards wrote:
> I have a system running a dual intel zeon 2.8Ghz with 4G of ram and
> using an intel raid controller model SRCU42X which uses the amr driver.
> I have had this server running 5.4 upgraded to 6.2 and was running fine
> for several months and then after a normal reboot I've started having
> all sorts of problems with what appears to be dead-locks in the
> filesystem.  This server is my backup server and I rsync files from
> various servers onto this one fairly non-stop.  If I stop the rsync's
> the system appears to be stable although I did have a kernel core just
> last night.
> When I have been able to observe the problem I ususally see one
> filesystem become inaccessible, perhaps var but I'm not sure, and then
> in a short period of time the whole system is inaccessible.  Usually if
> I startup just one of the rsync's within a couple of hours the system
> will be un-usable.
> I did find this thread which seems to describe similar issues but this
> is a different driver.
> http://lists.freebsd.org/pipermail/freebsd-questions/2006-August/127835.
> html

Probably not relevant then.  Deadlocks come in many varieties, all

> Currently I'm running with debug.mpsafevfs=0, debug.mpsafenet=1and
> debug.mpsafevm=0 but this doesn't seem to help.
> On perahps a related issue I have two other nearly identical systems
> which were going to be upgrading to 6.2 as on 5.4 I am experiencing
> deadlocks and when I hit ctrl-t I see the system is either stuck in ufs
> or zoneinfo and I have not found very much information about zoneinfo.
> Does anyone have any suggestions on what I can look for or other tuning
> options or had similar experiences?

See the chapter on kernel debugging in the developers handbook for the
information you need to provide before we can begin to debug your


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