Date: Sun, 04 May 2003 11:51:51 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: "Cliff L. Biffle" <cbiffle@safety.net> Cc: current@freebsd.org Subject: Re: Reproduceable kernel panic on boot Message-ID: <3EB56147.A4CBEB0A@mindspring.com> References: <200305040004.40214.cbiffle@safety.net>
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"Cliff L. Biffle" wrote: > Fatal trap 12: page fault while in kernel mode > fault virtual address = 0x0 > fault code = supervisor write, page not present > instruction pointer = 0x8:0xc1c1bd75 NULL pointer dereference. You probably want to post a traceback. If you have a debug kernel available, you probably want to gdb -k it, and then look at the code at 0xc1c1bd75; that will give you the exact line with the error. > I'd like to attach my kernel configuration, but have no working kernel on the > machine. Yay. It's basically GENERIC configured for I586 with at least the > following added: > options GEOM_AES, GEOM_BDE, GEOM_BSD, GEOM_GPT, GEOM_MBR, GEOM_VOL > options PSM_RESETAFTERSUSPEND > options CPU_SUSP_HLT, CPU_WT_ALLOC, NO_F00F_HACK, NO_MEMORY_HOLE > > The machine is a K6-2; I've uncommented the CFLAGS and COPTFLAGS in make.conf > but left them unchanged, and set cputype to k6-2. It's generally a bad idea to set the CPU type (see the recent discussion on -current about the guy who shot his foot off). In general, GCC tends to generate buggy code if you set the CPU type; of course, if you can live with buggy code... > > While I am using ccache, I've cleared and reset my caches and the problem > still occurs. > > Please, help! Now I get to see if I remember how to revert the entire tree to > a couple days ago. :-) Try also DISABLE_PSE and DISABLE_PG_G. AMD K6's are known to have the same CPU bug as Intel Xeons, P3's, and P4's. This is probably not what's happening in this case, as that's generally not a NULL pointer dereference problem, but it could have been in the page table code (to know for sure, you would have to post a traceback). -- Terry
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