Date: Wed, 16 Jul 2003 05:57:44 -0700 From: Avleen Vig <lists-freebsd@silverwraith.com> To: freebsd-hackers@freebsd.org Subject: Re: 4.8 panic "ffs_clusteralloc: map mismatch" Message-ID: <20030716125744.GI68950@silverwraith.com>
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> 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. 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. 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!"
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