4.8 panic "ffs_clusteralloc: map mismatch" [SOLVED]

[Andrew L. Neporada]

On Wed, Jul 16, 2003 at 05:57:44AM -0700, Avleen Vig wrote:
> > I have been experiencing several "ffs_clusteralloc: map mismatch"
> > kernel panics (always while heavy r/w activity on ad0). PC in question
> > has SuperMicro P3TDL3 motherboard,
> > 2 ide + 1 scsi HDD and 4 nics (full dmesg & kernel config attached).
> 
> Andrew,
> 
> I spend about two to three years fighting with a system trying to figure
> out what was wrong, and why these errors were caused. I got the very
> same crashes you're seeing now.
> I'm sure others are too, and I think this reply would be useful for the
> archives.

It seems that this panic was a result of filesystem corruption, which was 
caused by hw.ata.wc=1 on <ServerWorks ROSB4 ATA33 controller> and
<ST320414A> HDD.

After setting up hw.ata.wc=0 in /boot/loader.conf problems are all gone.

> -- 
> Avleen Vig                   "Say no to cheese-eating surrender-monkeys"
> Systems Admin                "Fast, Good, Cheap. Pick any two."
> www.silverwraith.com         "Move BSD. For great justice!"


				Andrew.