debugging frequent kernel panics on 8.2-RELEASE

Andriy Gapon avg at FreeBSD.org
Mon Aug 15 13:20:06 UTC 2011


on 15/08/2011 15:51 Steven Hartland said the following:
> ----- Original Message ----- From: "Andriy Gapon" <avg at FreeBSD.org>
> 
> 
>> on 15/08/2011 13:34 Steven Hartland said the following:
>>> (kgdb) list *0xffffffff8053b691
>>> 0xffffffff8053b691 is in vm_fault (/usr/src/sys/vm/vm_fault.c:239).
>>> 234             /*
>>> 235              * Find the backing store object and offset into it to begin the
>>> 236              * search.
>>> 237              */
>>> 238             fs.map = map;
>>> 239             result = vm_map_lookup(&fs.map, vaddr, fault_type, &fs.entry,
>>> 240                 &fs.first_object, &fs.first_pindex, &prot, &wired);
>>> 241             if (result != KERN_SUCCESS) {
>>> 242                     if (result != KERN_PROTECTION_FAILURE ||
>>> 243                         (fault_flags & VM_FAULT_WIRE_MASK) !=
>>> VM_FAULT_USER_WIRE) {
>>>
>>
>> Interesting... thanks!
>> Can you please also additionally provide (lengthy) output of x/512a
>> 0xffffff8d8f356fb0 ?
> 
> Sorry I'm not sure I follow your their?

It seems that you got me correctly :)

> Do you mean any of the following:-
> (kgdb) x/512a
> 0xffffff8d8f35b000:     Cannot access memory at address 0xffffff8d8f35b000
>
> (kgdb) list *0xffffff8d8f356fb0
> No source file for address 0xffffff8d8f356fb0.
> 
> or:
> (kgdb) x/512a 0xffffff8d8f356fb0
> 0xffffff8d8f356fb0:     Cannot access memory at address 0xffffff8d8f356fb0

Can you please try this (the last command) with 0xffffff8d8f357210 instead?

-- 
Andriy Gapon


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