Ufs dead-locks on freebsd 6.2

Andrew Edwards aedwards at sandvine.com
Wed May 16 16:20:29 UTC 2007

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.

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?

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