Date: Wed, 31 Aug 2005 14:28:13 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Eirik ?verby <ltning@anduin.net> Cc: stable@freebsd.org Subject: Re: 5.4-dropping to debugger Message-ID: <20050831182813.GA1847@xor.obsecurity.org> In-Reply-To: <25EF7E8A-5186-483C-9032-108CD3F53911@anduin.net> References: <25EF7E8A-5186-483C-9032-108CD3F53911@anduin.net>
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[-- Attachment #1 --] On Wed, Aug 31, 2005 at 12:51:00PM +0200, Eirik ?verby wrote: > Hi, every once in a while (about once a week lately), one of my > servers has been known to stop responding. Upon connecting the serial > console, I find myself at a debugger prompt. This is the output I've > gotten this time. > > I do think I have a debug kernel on that machine, what can I do to > get more useful information out? See the chapter on kernel debugging in the developers' handbook. Kris > > PS: I have seen various kinds of instability on most of my 5.4- > installations, no matter the patchlevel. This box is just one of many. > > Anyone? > > /Eirik > > db> > db> c > Fatal trap 12: page fault while in kernel mode > cpuid = 1; apic id = 01 > fault virtual address = 0x2007010 > fault code = supervisor write, page not present > instruction pointer = 0x8:0xc0581fe8 > stack pointer = 0x10:0xe3384c40 > frame pointer = 0x10:0xe3384c70 > 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 = 29 (irq18: fxp0) > [thread pid 29 tid 100000 ] > Stopped at fxp_add_rfabuf+0x68: movw %ax,0xe(%ebx) > db> trace > Tracing pid 29 tid 100000 td 0xc22a0000 > fxp_add_rfabuf(c2404000,c2404500,2,a6c54bb2,b51487f8) at > fxp_add_rfabuf+0x68 > fxp_intr_body(c2404000,c2404000,40,ffffffff,8) at fxp_intr_body+0xf1 > fxp_intr(c2404000,0,0,0,0) at fxp_intr+0x14e > ithread_loop(c22f6500,e3384d38,0,0,0) at ithread_loop+0x1b8 > fork_exit(c06a9150,c22f6500,e3384d38) at fork_exit+0x80 > fork_trampoline() at fork_trampoline+0x8 > --- trap 0x1, eip = 0, esp = 0xe3384d6c, ebp = 0 --- > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" > [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFDFfa9Wry0BWjoQKURAq8JAKC1XpCwuc9ESQuHIes5J5uDrNEdswCbBnsB WnQkV5oNiEJRjB9ZlMhH0Os= =hYFJ -----END PGP SIGNATURE-----
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