linux-kernel - Re: qemu-x86_64 booting with 8.0.0 stil see int3: when running LTP tracing testing.

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Message-ID: <20230704132125.GB17440@redhat.com>
Date:   Tue, 4 Jul 2023 14:21:25 +0100
From:   "Richard W.M. Jones" <rjones@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Benjamin Copeland <ben.copeland@...aro.org>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Richard Henderson <richard.henderson@...aro.org>
Subject: Re: qemu-x86_64 booting with 8.0.0 stil see int3: when running LTP
 tracing testing.

On Tue, Jul 04, 2023 at 08:46:20AM +0100, Richard W.M. Jones wrote:
> We have been having the same sort of problem
> (https://bugzilla.redhat.com/show_bug.cgi?id=2216496).  It's another
> of those bugs that requires hundreds or thousands of boot iterations
> before you can see it.  There is a test in comment 27 but it requires
> guestfish and some hacking to work.  I'll try to come up with a
> cleaner test later.

FWIW here's a better test.  It only uses qemu-system-x86_64 & a
vmlinuz file of your choice, and is very fast.  It usually hits the
bug in seconds.

  https://github.com/rwmjones/bootbootboot/tree/bz2216496

NB: You will need to change the definition of VMLINUX in
config-bz2216496-qemu.h (and generally read the code before running,
but hopefully it should just work apart from choosing a kernel image).

> I'd love to have a better way to debug this or collect more
> diagnostics if you have any suggestions.

Still open to any suggestions about better ways to debug this, or
anything you'd like me to try out.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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