> If your /rw/tmp is 1777, it may be the trigger of this aufs bug and
> please try this patch.

Yes you are right :) my first RO branch has 0777 and branches after
that has 1777, this patch fixed this problem, thank you very much :)

> So what you did is,
> # mount -t aufs -o br:/rw1:/ro1:/ro2 none /aufs
> # mount -o remount,prepend:/rw0 /aufs
> # mount -o remount,mod:/rw1=ro /aufs
> and crashed.
Yes that is.

About this problem with remount branch as RO:
1) I have image of Gentoo distributive (with 2.4 kernel)
2) after that I mounted branch in which I'm upgraded this image to 2.6
and other system software
So as you see my system boot with 2.6 kernel with aufs and mount this
braches, then chroot to them and start init. If I run system with
upgraded software (to 2.6) all work's fine, but if I just boot system
without (mounting branch with 2.6 upgrade) I receive error with
remount, so problem occurred only in this situation.

Now I try to investigate this (try to do what you say - apply patch
and turn on logging).

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