Re: [PATCH] umount versus iprune

[Hugh Dickins]

On Thu, 20 Feb 2003, Andrew Morton wrote:
> Hugh Dickins <[e-mail]> wrote:
> >
> > When prune_icache coincides with unmounting, invalidate_inodes notices
> > the inode it's working on as busy but doesn't wait: Self-destruct in 5
> > seconds message, and later iput oopses on freed super_block.
> 
> Is 2.4 affected?

Good question.

I had thought obviously not, 2.4 prune_icache doesn't __iget and
drop inode_lock as 2.5 does (while invalidating buffers and pages).
Looks like 2.4 leaves that work to the subsequent dispose_list's
truncate_inode_pages.

But that raises the doubt: maybe 2.4 won't get any Self-destruct
message, but when prune_icache calls dispose_list calls clear_inode
and destroy_inode, there could be a reference to freed super_block?

Perhaps there's some other reason why not,
I'll check it out more carefully later.

Hugh