4.8 panic "ffs_clusteralloc: map mismatch"

[Andrew L. Neporada]

On Wed, Jul 16, 2003 at 05:57:44AM -0700, Avleen Vig wrote:
> 
> 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.
> 
> My Solution:
> I eventually realised that my problem was with one of three things:
> 1) bit flips in main memory
> 2) bit flips in cache
> 3) bad hard drive
> 
> I replaced all of the memory after a few months. The problems stopped
> for a few weeks but quickly returned. So I don't think it was main
> memory, unless the new set or the sockets were damaged.
> I couldn't replace the cache because I couldn't find any more. The
> system was an old P1 (originally 75Mhz). This could have been the
> problem.

My system has brand new MB (supermicro dual proc mainbord with U160 SCSI & 
fxp NIC integrated), P3 processor & memory (btw, ECC memory). 
Other components are not-so-new, but they worked flawlessly for about a 
year with another MB. 


> I did once try turning off L2 cache in the BIOS, and I think the crashes
> *might* have continued. So it's possible the problems were here.
> 
> Finally I didn't replace the hard drive, but I did find that moving load
> off the original drive to a second drive helpped reduce the number of
> crashes, although they still continued to happen.
> 
> HTH.
> 
> -- 
> 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.