Re: BUG: unable to handle kernel NULL pointer dereference at (null)

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On Wed, Apr 06, 2011 at 02:47:28PM -0600, Jordan Patterson wrote:
> Hi Josef:
> 
> I tried your latest patch, since I had the same issue from the first
> email.  With the patch applied, I am now hitting the
> BUG_ON(block_group->total_bitmaps >= max_bitmaps); in add_new_bitmap
> in
> fs/btrfs/free-space-cache.c:1246 as soon as I mount the filesystem,
> with or without -o clear_cache.
> 
> It works fine in 2.6.38.  I get the same error after mounting with
> clear_cache under 2.6.38 and rebooting into the current kernel with
> your patch.
> 

Do you have a backtrace so I can see how we're getting here?  This is a seperate
issue from the one this patch tries to solve, but now that it seems that's fixed
I will work on this now :).  Thanks,

Josef
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