Date: Wed, 29 Jul 1998 06:11:21 -0400 (EDT) From: Thomas David Rivers <rivers@dignus.com> To: freebsd-questions@FreeBSD.ORG, Les.LaCroix@Carleton.edu Subject: Re: (long) page fault in kernel mode: suggestions? Message-ID: <199807291011.GAA00392@lakes.dignus.com> In-Reply-To: <4027246050.901675410@miranda.INFOZOO.com>
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Les -
If you config and build a new kernel with debugging on, you can run
gdb -k on the new crash and get more information.
To build a debuggable kernel, us
config -g KERNEL_CONFIG_FILE
Also - I've added your note to a previous bug report I've sent it
(bug #7367) along with a very similar traceback I've just gotten.
You mention that the problem occurs with 2.2.6 and 2.2.7 - my problems
didn't begin until I installed 2.2.6. Did you have this box sucessfully
set up with a version prior to 2.2.6?
- Dave Rivers -
"Les LaCroix" <Les.LaCroix@Carleton.edu> wrote:
>
> I've been fighting a "fatal trap 12: page fault while in kernel mode"
> problem. Clues are appreciated. I'm running out of ideas.
>
> New machine (configuration below). Crashes in a similar (if not the exactly
> the same) way with GENERIC kernel and a custom kernel with virtually
> everything removed, in both 2.2.6 and 2.2.7. I've not changed anything in
> the kernel source.
>
> I don't have the panic screen from other days, but tonight it crashed 3
> times in 5 hours like this:
>
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0xe011087c
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xe011087c
> stack pointer = 0x10:0xf019cfa0
> frame pointer = 0x10:0xf019cfb8
> 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 = Idle
> interrupt mask =
> panic: page fault
>
> Each crash was the same: same instruction, stack and frame pointers, same
> everything. gdb -k on the dumps all look like:
>
> (kgdb) symbol-file /kernel
> Reading symbols from /kernel...done.
> (kgdb) exec-file /var/crash/kernel.2
> (kgdb) core-file /var/crash/vmcore.2
> IdlePTD 1c1000
> current pcb at 1a8bb0
> panic: page fault
> #0 boot (howto=256) at ../../kern/kern_shutdown.c:266
> 266 dumppcb.pcb_cr3 = rcr3();
> (kgdb) where
> #0 boot (howto=256) at ../../kern/kern_shutdown.c:266
> #1 0xf010eb12 in panic (fmt=0xf017693f "page fault")
> at ../../kern/kern_shutdown.c:400
> #2 0xf017751e in trap_fatal (frame=0xf019cf64) at
> ./../i386/i386/trap.c:772
> #3 0xf0176fe0 in trap_pfault (frame=0xf019cf64, usermode=0)
> at ../../i386/i386/trap.c:681
> #4 0xf0176c77 in trap (frame={tf_es = 16, tf_ds = 16, tf_edi = -1073741824,
> tf_esi = -535754628, tf_ebp = -266743880, tf_isp = -266743924,
> tf_ebx = -260199936, tf_edx = -226815792, tf_ecx = 1073741823,
> tf_eax = -2147483648, tf_trapno = 12, tf_err = 0, tf_eip = -535754628,
> tf_cs = 8, tf_eflags = 66118, tf_esp = -267363380, tf_ss =
> -260199936})
> at ../../i386/i386/trap.c:324
> #5 0xe011087c in ?? ()
>
> I'm not familiar enough (yet) with gdb and kernel debugging to try to figure
> out what's going on. My current hunch is that something is corrupting the
> stack, changing the return address, and causing the page fault when
> something does a return.
>
> The machine:
>
> Epox 100Mhz 51MVP3E-M ATX board with 1MB cache:
> bus clock = 100 MHz
> multiplier = 3x
> SDRAM clock = CPU bus clock
> AMD K6 300 MMX CPU
> 128MB PC100 SDRAM/ECC 8ns 168-pin DIMM w/ EPROM, 100MHz Mbrds
> Seagate 6.4GB 7200 RPM IDE drive (ST36530A)
> Adaptec ISA 1520 SCSI-2 Controller (for an external ZIP, but nothing
> attached yet)
> Intel EtherExpress Pro/100B
> 8MB Millenium II PCI (but not running X or doing anything but dumb console
> work yet)
> Teac 24x, IDE (ATAPI)
>
> There's nothing interesting running, usually. I killed sendmail and cron
> (although I left inetd, syslogd, portmap and a couple getty's running).
>
> Thanks in advance.
> ------
> Les LaCroix, Carleton College
>
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