[Ocfs2-devel] [XFS on bad superblock] BUG: unable to handle kernel NULL pointer dereference at 00000003

[Fengguang Wu]

On Thu, Oct 10, 2013 at 11:33:00AM +0800, Fengguang Wu wrote:
> On Thu, Oct 10, 2013 at 11:26:37AM +0800, Fengguang Wu wrote:
> > Dave,
> > 
> > > I note that you have CONFIG_SLUB=y, which means that the cache slabs
> > > are shared with objects of other types. That means that the memory
> > > corruption problem is likely to be caused by one of the other
> > > filesystems that is probing the block device(s), not XFS.
> > 
> > Good to know that, it would easy to test then: just turn off every
> > other filesystems. I'll try it right away.
> 
> Seems that we don't even need to do that. A dig through the oops
> database and I find stack dumps from other FS.
> 
> This happens in the kernel with same kconfig and commit 3.12-rc1.

Here is a summary of all FS with oops:

    411 ocfs2_fill_super
    189 xfs_fs_fill_super
     86 jfs_fill_super
     50 isofs_fill_super
     33 fat_fill_super
     18 vfat_fill_super
     15 msdos_fill_super
     11 ext2_fill_super
     10 ext3_fill_super
      3 reiserfs_fill_super

Thanks,
Fengguang