kern/127699: [panic] Fatal trap 12: page fault while in kernel
nospam at ofloo.net
Fri Oct 3 21:30:08 UTC 2008
The following reply was made to PR kern/127699; it has been noted by GNATS.
From: Wouter Snels <nospam at ofloo.net>
To: Volker Werth <vwe at freebsd.org>, bug-followup at freebsd.org
Subject: Re: kern/127699: [panic] Fatal trap 12: page fault while in kernel
Date: Fri, 03 Oct 2008 23:19:23 +0200
kgdb /boot/kernel/kernel /var/crash/vmcore.3
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
Fatal trap 12: page fault while in kernel mode
cpuid = 3; apic id = 02
fault virtual address = 0x4c
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc577373d
stack pointer = 0x28:0xe8edd808
frame pointer = 0x28:0xe8edd84c
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 = 7569 (irssi)
trap number = 12
panic: page fault
cpuid = 3
Physical memory: 2035 MB
Dumping 182 MB: 167 151 135 119 103 87 71 55 39 23 7
#0 doadump () at pcpu.h:195
195 pcpu.h: No such file or directory.
#0 doadump () at pcpu.h:195
#1 0xc0754507 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:409
#2 0xc07547c9 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:563
#3 0xc0a5632c in trap_fatal (frame=0xe8edd7c8, eva=76)
#4 0xc0a56590 in trap_pfault (frame=0xe8edd7c8, usermode=0, eva=76)
#5 0xc0a56f12 in trap (frame=0xe8edd7c8) at
#6 0xc0a3d88b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#7 0xc577373d in ?? ()
Previous frame inner to this frame (corrupt stack?)
Volker Werth schreef:
> On 10/02/08 00:07, Wouter Snels wrote:
>> First, want to thank you for your respond. There arn't any additional
>> modules/patches installed, ..
>> Id Refs Address Size Name
>> 1 4 0xc0400000 91d344 kernel
>> 2 1 0xc0d1e000 6a32c acpi.ko
>> 3 1 0xc5772000 3000 if_stf.ko
>> I included make.conf because I thought it might be useful.
>> I'm not exactly sure what mean by, world and kernel being sync'ed, I
>> compiled according to the freebsd manual, ..
>> I followed exactly those steps:
>> # cd /usr/src/sys/i386/conf
>> # config OFL
>> # cd ../compile/OFL
>> # make -j9 cleandepend
>> # make -j9 depend
>> # cd /usr/src
>> # make -j9 buildworld
>> # make -j9 buildkernel
>> # make -j9 installkernel
>> # reboot
>> # mergemaster -p
>> # make -j9 installworld
>> # mergemaster
>> # reboot
>> Can you tell me how to do a kernel backtrace, I've done a quick search
>> on google but couldn't really find any information on how to do this. Or
>> give me a link to a page which explains it.
>> Regards, WS
> sorry for the delay (I think I didn't already answer back, did I?).
> First, a short explanation about your kernel build process. You can
> combine all your painful commands into a simple one (as clean,
> cleandepend and others are automagically executed):
> # cd /usr/src ; make buildworld buildkernel KERNCONF=OFL
> and after successful build:
> # make installkernel && nextboot -o "-s" -k kernel
> (now it's booting into single user mode)
> # cd /usr/src ; make installworld && mergemaster
> Don't forget to do: # cd /usr/src && make check-old
> and probably a ``make delete-old'' as check-old may or may not suggest.
> Anyway, now to your problem.
> If your kernel panics, it will (if well configured) write a kernel core
> dump into swapspace. On the next reboot, the system executes ``savecore
> -C'' to check for a core dump in swapspace and will save it into
> If that goes well, you can inspect that dump using ``kgdb'':
> # kgdb /boot/kernel/kernel /var/crash/vmcore.N (N=latest written core dump)
> When kgdb comes up, issue a ''bt'' command at the (kgdb) prompt. Please
> send me the output (best is to include bug-followup at freebsd.org in CC so
> we have that information attached to the PR).
> If you need to know anything else, please let me know.
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