6.2 Freezes

[Nikos Vassiliadis]

On Thursday 12 July 2007 13:02, Steven Wagner wrote:
> Our server is running for awhile (sometimes 1 day, sometimes less than
> an hour) then ssh sessions hang and disconnect, web server times out,
> console allows us to give input to the login prompt, but after typing
> root and hitting enter the password prompt never appears.

Looks like the UFS subsystem is deadlocked...

[snip]
> 1035 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1016 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1041 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1033 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1036 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1034 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1038 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1040 root 1 -4 0 10904K 9636K ufs 0:12 0.00% perl5.8.8
> 1039 root 1 -4 0 10900K 9632K ufs 0:11 0.00% perl5.8.8
> 1101 root 1 96 0 9972K 9040K select 0:05 0.00% named
> 2170 root 1 -4 0 80996K 79172K ufs 0:05 0.00% perl5.8.8

Yes, lots of processes are stuck in ufs state.

[snip]

> If anyone has any ideas on what might be causing this or a suggestion as
> to how I can capture more information at the time of a crash it's very
> much appreciated.

I am not aware of the state of UFS snapshots on 6.2R,
but on previous releases there were such problems.

So, do you have any snapshots on active filesystems?
snapinfo(8) will help you find out.

HTH, Nikos