Re: [uml-devel] Possible hostfs uml kernel data corruption with missing host directory (fc6, 2.6.20-rc5-git3 on opteron)

[William Stearns <wstearns@pobox.com>]

Good morning, Jeff, all,

On Fri, 26 Jan 2007, Jeff Dike wrote:

> On Fri, Jan 26, 2007 at 04:07:05AM -0500, William Stearns wrote:
>> 	After bisecting the difference between the two root filesystems,
>> the critical change was a line in /etc/fstab:
>>
>> none            /mirrors        hostfs  defaults,/home/mirrors  0 0
>>
>> 	Woah.
>
> Hmmm.
>
> Can you enable all of the memory debugging options under Kernel
> Hacking and try this again?  The slab debugging may trap it closer to
> the actual bug.

 	You got it:

[wstearns@ford kernels]$ diff -bd -U 0 <(sort config-2.6.20-rc5-git3-1 ) 
<(sort config-2.6.20-rc5-git3-debugging-2 )
-# CONFIG_DEBUG_LIST is not set
+CONFIG_DEBUG_LIST=y
-# CONFIG_DEBUG_MUTEXES is not set
-# CONFIG_DEBUG_RT_MUTEXES is not set
-# CONFIG_DEBUG_RWSEMS is not set
-# CONFIG_DEBUG_SLAB is not set
+CONFIG_DEBUG_MUTEXES=y
+CONFIG_DEBUG_PI_LIST=y
+CONFIG_DEBUG_RT_MUTEXES=y
+CONFIG_DEBUG_RWSEMS=y
+CONFIG_DEBUG_SLAB_LEAK=y
+CONFIG_DEBUG_SLAB=y
-# CONFIG_DEBUG_SPINLOCK_SLEEP is not set
-# CONFIG_DEBUG_VM is not set
+CONFIG_DEBUG_SPINLOCK_SLEEP=y
+CONFIG_DEBUG_VM=y

 	But no additional debugging messages showed up; just a similar 
kernel panic at bringing up networking.
 	If you want to take a look, I've placed the root filesystem and 
the new debug-enabled kernel at http://ford.stearns.org/uml/ , along with 
the command used to invoke.
 	Cheers,
 	- Bill

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William Stearns (wstearns@pobox.com).  Mason, Buildkernel, freedups, p0f,
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