On Fri, 18 Jul 2008, Edward Ruggeri wrote: > I can launch lynx (my favorite non-graphical browser) or firefox and load > google. I can make a search and get results, but the kernel always panics > by the time I try to load a third webpage (or earlier). This is what I get: > > Fatal trap 12: page fault while in kernel mode > cpuid = 1; apic id = 01 > fault virtual address = 0x0 > fault code = supervisor read, page not present > instruction pointer = 0x20:0xc0484aa6 > stack pointer = 0x28:0xe7ffe8bc > frame pointer = 0x28:0xe7ffe928 > 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 = 1427 (lynx) [I've also seen this from ath0 taskq] > trap number = 12 > panic: page fault > cpuid = 1 > Uptime: 51m37s > Physical memory: 2014 MB > Dumping 109 MB: > Snyncing disks, vndoes remaining...[Zeros] > > I'm pretty much a freeBSD novice, so I don't know what to do as it prints > out line after line of zeros (slowly). Normally I just shut the sucker > down, because it seems content to print the zeros forever... But as FreeBSD > starts up, it says "savecore: no dumps found." But I have compiled the > kernel with debugging symbols (makeoptions DEBUG=-g), so maybe you can > advise. This is a NULL pointer dereference in the kernel, which almost certainly means a kernel bug. Per e-mail you've already received from Garrett Cooper, we need some further debugging information, such as a kernel astack trace. If you're unable to get a dump, a DDB stack trace would probably help quite a bit (options DDB, when it drops into the debugger, save the results of the command "trace"). Please do a file a PR with those results. I'm a bit puzzled that your box is syncing after a panic -- normally the kernel is configured not to do that -- could kern.sync_on_panic be set in your loader.conf or sysctl.conf? Robert N M Watson Computer Laboratory University of Cambridge > > I hope someone is able to help. Do you think I should file a problem report? > > Thanks for reading. Good night! > > Sincerely, > > -- Ned Ruggeri > _______________________________________________ > freebsd-current_at_freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe_at_freebsd.org" >Received on Fri Jul 18 2008 - 09:13:46 UTC
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