linux-kernel - Re: Linux 5.13-rc6 regression to 5.12.x: kernel OOM and panic during kernel boot in low memory Xen VM's (256MB assigned memory).

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Date:   Thu, 17 Jun 2021 12:30:40 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Sander Eikelenboom <linux@...elenboom.it>,
        linux-kernel <linux-kernel@...r.kernel.org>
Cc:     "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: Linux 5.13-rc6 regression to 5.12.x: kernel OOM and panic during
 kernel boot in low memory Xen VM's (256MB assigned memory).

On 17.06.21 11:26, Sander Eikelenboom wrote:
> L.S.,
> 
> I just tried to upgrade and test the linux kernel going from the 5.12 
> kernel series to 5.13-rc6 on my homeserver with Xen, but ran in some 
> trouble.
> 
> Some VM's boot fine (with more than 256MB memory assigned), but the 
> smaller (memory wise) PVH ones crash during kernel boot due to OOM.
> Booting VM's with 5.12(.9) kernel still works fine, also when dom0 is 
> running 5.13-rc6 (but it has more memory assigned, so that is not 
> unexpected).
> 
> The 5.13-rc6'ish kernel is a pull of today, tried both with and without 

> last AKPM's patches, but that
> makes no difference.
> 
> Below are stacktraces from a few of the crashing VM's.
> 
> Attached is the kernel .config
> 
> Any pointers ?

Did you compare memory usage with a bootable guest between kernel 5.12
and 5.13-rc6?

Any chance you could bisect?


Juergen

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