reboot after panic : page fault for two consecutive days now with FreeBSD stable 7.0

Edwin L. Culp eculp at
Wed Jun 18 23:12:47 UTC 2008

Kris Kennaway <kris at> escribió:

> eculp wrote:
>> This is on a relatively new Dell dualcore with 4G of ram running up  
>> to date stable.  I'm not on site so I have no idea what might be  
>> provoking these crashes.  In fact in many years of running FreeBSD  
>> I've not seen something just happen like this.  It is a  
>> simi-production machine that cvsups daily and builds and installs a  
>> new world and kernel.  Ports are updated about once a week and  
>> haven't seen any issues previously.  It has been running 24/7 since  
>> new, about 8 months.
>> 3 files were generated info, bounds and vmcore.  The info file follows:
>> Dump header from device /dev/mfid0s1b
>>  Architecture: i386
>>  Architecture Version: 2
>>  Dump Length: 341225472B (325 MB)
>>  Blocksize: 512
>>  Dumptime: Wed Jun 11 12:34:24 2008
>>  Hostname:
>>  Magic: FreeBSD Kernel Dump
>>  Version String: FreeBSD 7.0-STABLE #258: Tue Jun 10 05:54:42 CDT 2008
>>    root at
>>  Panic String: page fault
>>  Dump Parity: 2395754794
>>  Bounds: 2
>>  Dump Status: good
>> the vmcore is about 300M so I'm not attaching it;) I could put it  
>> on line at a moments notice.  I think that what I need is probably  
>> a crash course on debugging a crash and I really don't know where  
>> to start since after over 10 years with freebsd I've never needed  
>> it.  Any help, suggestions, etc. would be greatly appreciated.
> See the developers' handbook chapter on kernel debugging.
> However, panics that "suddenly" start happening frequently on a  
> system that has been stable for a while with no OS or workload  
> changes made, are usually due to the hardware starting to fail.
> Kris

I got as far as I could.  I recompiled the kernel with debuging and  
waited for a new panic.  I got the fourth one a few minutes ago and  
went as far as I could with the handbook.

  #  kgdb kernel.debug /var/crash/vmcore.4
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
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 = 0; apic id = 00
fault virtual address	= 0x0
fault code		= supervisor write, page not present
instruction pointer	= 0x20:0xc0716ba9
stack pointer	        = 0x28:0xe6d2bc4c
frame pointer	        = 0x28:0xe6d2bc4c
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		= 13 (swi4: clock sio)
trap number		= 12
panic: page fault
cpuid = 0
Uptime: 1d4h34m22s
Physical memory: 3315 MB
Dumping 273 MB: 258 242 226 210 194 178 162 146 130 114 98 82 66 50 34 18 2

Reading symbols from /boot/kernel/mfi_linux.ko...Reading symbols from  
Loaded symbols for /boot/kernel/mfi_linux.ko
Reading symbols from /boot/kernel/acpi.ko...Reading symbols from  
Loaded symbols for /boot/kernel/acpi.ko
Reading symbols from /boot/kernel/fdescfs.ko...Reading symbols from  
Loaded symbols for /boot/kernel/fdescfs.ko
#0  doadump () at pcpu.h:195
195		__asm __volatile("movl %%fs:0,%0" : "=r" (td));


That is as far as I got, any suggestions appreciated. I'm going to  
check the others and see if the get further.


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