linux-kernel - Re: [PATCH] mapletree-vs-khugepaged

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Message-ID: <Ymvjt7GEXE306WyE@osiris>
Date:   Fri, 29 Apr 2022 15:10:15 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mapletree-vs-khugepaged

On Fri, Apr 29, 2022 at 01:01:53PM +0000, Liam Howlett wrote:
> * Heiko Carstens <hca@...ux.ibm.com> [220429 08:10]:
> > On Thu, Apr 28, 2022 at 10:20:40AM -0700, Guenter Roeck wrote:
> > > On Wed, Apr 27, 2022 at 03:10:45PM -0700, Andrew Morton wrote:
> > > > Fix mapletree for patch series "Make khugepaged collapse readonly FS THP
> > > > more consistent", v3.
> > > > 
> > > > Cc: Liam R. Howlett <Liam.Howlett@...cle.com>
> > > > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > > 
> > > This patch causes all my sparc64 boot tests to fail. Bisect and crash logs
> > > attached.
> > > 
> > > Guenter
...
> > 
> > FWIW, same on s390 - linux-next is completely broken. Note: I didn't
> > bisect, but given that the call trace, and even the failing address
> > match, I'm quite confident it is the same reason.
> 
> This is worth a lot to me.  Thanks for the report and the testing.

Not sure if it is of any relevance, and you are probably aware if it
anyway, but both sparc64 and s390 are big endian; and there was no
report from little endian architectures yet.