linux-kernel - Re: qemu-i386 boot failed on mainline master

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Message-ID: <CA+G9fYsefOWiHbnnbOjjG4kaX3o4hKOkOtDpVfzQNd+E9ycc8g@mail.gmail.com>
Date: Wed, 9 Apr 2025 20:01:20 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: open list <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, 
	linux-mm <linux-mm@...ck.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, Thomas Gleixner <tglx@...utronix.de>, 
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Vinod Koul <vkoul@...nel.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, Arnd Bergmann <arnd@...db.de>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Anders Roxell <anders.roxell@...aro.org>, 
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: qemu-i386 boot failed on mainline master - no console output

On Wed, 2 Apr 2025 at 16:57, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Wed, Apr 02, 2025 at 02:24:53PM +0530, Naresh Kamboju wrote:
> > + Linus
> > + Greg KH
> >
> > On Wed, 2 Apr 2025 at 14:14, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> > >
> > > Regressions on qemu-i386 devices boot tests failed with defconfig on
> > > the mainline master no console output.
> > >
> >
> > The qemu-i386 boot failed with no console output and is still happening on
> > the latest mainline master branch.
> >
> > > First seen on the char-misc-6.15-rc1 merge 25601e85441d ("Merge tag
> > > 'char-misc-6.15-rc1' of...)
> > >  Good: [08733088b566b58283f0f12fb73f5db6a9a9de30] Merge tag
> > > 'rust-fixes-6.15-merge'
> > >  Bad:  [91e5bfe317d8f8471fbaa3e70cf66cae1314a516] Merge tag 'dmaengine-6.15-rc1'
> > >
> > > * qemu-i386
> > >  - boot
> > >
> > > Regression Analysis:
> > >  - New regression? Yes
> > >  - Reproducibility? Yes
> > >
> > > Test regression: qemu-i386 boot failed on mainline master
> > > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> > >
> > > Anders bisected this to,
> > >   # first bad commit:
> > >     [eb0ece16027f8223d5dc9aaf90124f70577bd22a]
> > >     Merge tag 'mm-stable-2025-03-30-16-52' of
> > > git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
>
> But this is bisected to the mm merge, not the char-misc merge, right?
>
> And is this just on i386?  Nothing arch-specific in the char-misc merge
> that I can see, so I would place bets on mm doing something accidentally
> on 32bit systems.

The qemu-i386 boot pass with the latest mainline kernel with
clang-nightly and gcc-13.
 Linux version 6.15.0-rc1 (tuxmake@...make) (Debian clang version
21.0.0 (++20250402105505+c57b9c233a87-1~exp1~20250402225526.1363),
Debian LLD 21.0.0) #1 SMP PREEMPT_DYNAMIC @1743981563


Links:
 - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/naresh/tests/2vUkJBr5vV419fzcTFDkOmiIkax
 - https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/naresh/tests/2vUk3KcyEleDxVppDpZ1jeSIx0j

 - Naresh

>
> thanks,
>
> greg k-h