Date: Sat, 20 Nov 2004 18:00:52 GMT From: Robert Watson <rwatson@FreeBSD.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/74156: SMP crashes Message-ID: <200411201800.iAKI0q5C014450@freefall.freebsd.org>
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The following reply was made to PR kern/74156; it has been noted by GNATS. From: Robert Watson <rwatson@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Cc: Subject: Re: kern/74156: SMP crashes Date: Sat, 20 Nov 2004 17:58:40 +0000 (GMT) On Sat, 20 Nov 2004, O. Hartmann wrote: > Fatal trap 12: page fault while in kernel mode > cpuid = 1; apic = 00 > fault virtual address = 0x1c > fault code = supervisor write, page not present > instruction pointer = 0x8:0xc062ac76 > stack pointer = 0x10:0xe4e2d7ac > frame pointer = 0x10:0xe4e2d7c4 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 44 (swi5: clock sio) > [thread 100042] > Stopped at ref +0x16: lock cmpxchgl %edx, 0x1c(%edx) Could I get you to run the following commands in DDB and include the output here: - show pcpu - "show pcpu X" foreach each cpu X - trace - trace on each thread active on a cpu shown using "show pcpu" - Use addr2line or gdb on a kernel with debug symbols to convert the symbol+offsets I've seen some similar reports of a page fault out of the clock/sio thread, but it may well be a specific callout. Thanks! Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Research
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