linux-ext4 - Re: Potential regression on kernel 5.19-rc0: kernel BUG at mm/page_table

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Date:   Tue, 31 May 2022 01:43:48 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Dave Chinner <david@...morbit.com>
Cc:     Zorro Lang <zlang@...hat.com>, linux-mm@...ck.org,
        linux-xfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        nvdimm@...ts.linux.dev
Subject: Re: Potential regression on kernel 5.19-rc0: kernel BUG at
 mm/page_table_check.c:51!

On Tue, May 31, 2022 at 08:29:19AM +1000, Dave Chinner wrote:
> On Tue, May 31, 2022 at 02:39:08AM +0800, Zorro Lang wrote:
> > It's not a regression *recently* at least, I still can reproduce this bug on
> > linux v5.16.
> > 
> > But I found it's related with someone kernel configuration (sorry I haven't
> > figured out which one config is). I've upload two kernel config files, one[1]
> > can build a kernel which reproduce this bug, the other[2] can't. Hope that
> > helps.
> > 
> > Thanks,
> > Zorro
> > 
> > [1]
> > https://bugzilla.kernel.org/attachment.cgi?id=301076
> > 
> > [2]
> > https://bugzilla.kernel.org/attachment.cgi?id=301077
> 
> Rather than make anyone looking at this download multiple files and
> run diff, perhaps you could just post the output of 'diff -u
> config.good config.bad'?

You guys know about tools/testing/ktest/config-bisect.pl right?