Date: Mon, 17 Jul 1995 17:09:23 +1000 From: Bruce Evans <bde@zeta.org.au> To: esser@zpr.uni-koeln.de, yenbut@cs.washington.edu Cc: hackers@freebsd.org Subject: Re: One cause of 2.05R instability found Message-ID: <199507170709.RAA22674@godzilla.zeta.org.au>
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>A few days ago, my system (the kernel has the if statement in ncr.c commented >out) crashed twice after it has been running fine for almost a week: It seems to be just flaky hardware. >Fatal trap 12: privileged instruction fault while in kernel mode >instruction pointer = 0x8:0xf0128e83 >code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 >processor eflags = interrupt enabled, resume, IOPL = 0 >current process = 13345 (nntpd) >interrupt mask = >kernel type 1 trap, code = 0 >stopped at _lookup + 0x11b: lcall *%edi I had an interesting crash like this. I was running one of my systems in non-turbo mode to serial test overload conditions. It crashed on a privileged instruction. Examining nearby memory using ddb showed that there was a single bit error in the instruction. I restored the bit and continued successfully. This system has the "slow refresh" option set to as slow as possible and I guess that using this violates the memory specs more when the system is in non-turbo mode. Bruce
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