[Unionfs] BUG: unable to handle kernel NULL pointer dereference with unionfs and kernel 2.6.21.5

[Rene Mayrhofer]

On Freitag 06 Juli 2007, Erez Zadok wrote:
> 3. Give me your precise configuration.  Preferably, step by step
>    instructions how you build your tmpfs, squashfs image, what you mount,
>    loopback, and in what order.  The more info, the better.
>
> I'll try to reproduce your bug on my end here, but the above info will go a
> long way towards reproducibility (which is half of the battle to fix any
> bug
Agreed :) I created bug #572 with the patches and my kernel config.

For reproducing, I have the following situation (which is created by rather 
complex shell scripts, so I can't give a few simple steps unfortunately):

/ mounted from a squashfs image that is mounted loopback by initrd
/system/root bind-mounted to /
/system/ramdisks/etc mounted as tmpfs
/system/ramdisks/var mounted as tmpfs
/etc unionfs with dirs=/system/ramdisks/etc=rw:/system/root/etc
/var unionfs with dirs=/system/ramdisks/var=rw:/system/root/var

If you need any more details, please don't hesitate to poke me.

with best regards,
Rene

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