linux-kernel - Re: kernel BUG in block

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Message-ID: <CACkBjsZ8vxzSAnhVqnkJwQi1a5oCddGRZrK5bmvUQYzDKBDsjw@mail.gmail.com>
Date:   Fri, 8 Oct 2021 11:02:14 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        viro@...iv.linux.org.uk, linux-fsdevel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: kernel BUG in block_invalidatepage

Matthew Wilcox <willy@...radead.org> 于2021年10月7日周四 下午10:20写道：
>
> On Thu, Oct 07, 2021 at 02:40:29PM +0800, Hao Sun wrote:
> > Hello,
> >
> > This crash can still be triggered repeatedly on the latest kernel.
>
> I asked you three days ago to try a patch and report the results:
>
> https://lore.kernel.org/linux-mm/YVtWhVNFhLbA9+Tl@casper.infradead.org/

Sorry, I missed that.

Here are the results.
Used reproducer: https://paste.ubuntu.com/p/yrYsn4zpcn/
Kernel log *before* applying the patch: https://paste.ubuntu.com/p/WtkFKB6Vy9/
Kernel log *after* applying the patch: https://paste.ubuntu.com/p/S2VrtDdggp/
Symbolized log: https://paste.ubuntu.com/p/RwXjCXDxB8/

In summary, the reproducer can crash the kernel with the same
backtrace before applying the patch.
After applying the patch, the reproducer program took about 3 minutes
to crash the kernel and the backtrace seems different (RIP points to
create_empty_buffers now).
All the above tests were done on commit 60a9483534ed (Merge tag
'warning-fixes-20211005').

Regards
Hao