linux-kernel - Re: [linus:master] [mm/mmap] 0503ea8f5b: kernel_BUG_at

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Date:   Mon, 27 Feb 2023 03:52:12 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        kernel test robot <oliver.sang@...el.com>,
        oe-lkp@...ts.linux.dev, lkp@...el.com,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-perf-users@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [linus:master] [mm/mmap]  0503ea8f5b: kernel_BUG_at_mm/filemap.c

On Sun, Feb 26, 2023 at 10:17:56PM -0500, Liam R. Howlett wrote:
> Are you sure about this bisection?  I'm not saying it isn't my fault or
> looking to blame others, but I suspect we are indeed looking at the
> wrong commit here.

I concur.  Looking at the backtrace, I think it's more likely to be
a pagecache, swapcache or shmfs issue.  I'll look more in the morning.

> >         bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email
> > 
> >         # if come across any failure that blocks the test,
> >         # please remove ~/.lkp and /lkp dir to run from a clean state.
> > 
> 
> This does not work for me.  Since my last use of lkp it seems something
> was changed and now -watchdog is not recognized by my qemu and so my
> attempts to reproduce this are failing.  Is there a way to avoid using
> the -watchdog flag?  Running the command by hand fails as it seems some
> files are removed on exit?

https://www.qemu.org/docs/master/about/removed-features.html

-watchdog (since 7.2)

Use -device instead.

(I have no idea what this means, but maybe it's a clue?)