linux-kernel - Re: bcachefs page fault oops after device evacuate/remove and unmount

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Date:   Thu, 30 Nov 2023 20:50:55 -0500
From:   Kent Overstreet <kent.overstreet@...ux.dev>
To:     Daniel J Blueman <daniel@...ra.org>
Cc:     Linux Kernel <linux-kernel@...r.kernel.org>,
        linux-bcachefs@...r.kernel.org
Subject: Re: bcachefs page fault oops after device evacuate/remove and unmount

On Thu, Nov 30, 2023 at 08:47:33PM -0500, Daniel J Blueman wrote:
> Hi Kent et al,
> 
> On upstream bcachefs (master @ evilpiepirate.org/git/bcachefs.git) SHA
> f8a1ba26, I was able to develop a minimal reproducer [1] for a page
> not present oops I can provoke [2]. It appears we need further
> synchronisation during unmount.
> 
> Let me know when there is a patch I can test, or for debug.

There was a device removal that was just fixed, I've already sent the
pull request to Linus but in the meantime try this branch:

https://evilpiepirate.org/git/bcachefs.git/log/?h=bcachefs-for-upstream

If you still hit it, I'll turn your reproducer into a ktest test and
hunt it down.