linux-kernel - Re: Bug involving dynamic

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Message-ID: <CAJtEV7YfgcxuEAj+a8SbNmsoMHaEgY1RQ1RoR=8nAi4=8qwT_w@mail.gmail.com>
Date:	Tue, 12 Mar 2013 10:28:53 +0800
From:	Andrew Cooks <acooks@...il.com>
To:	Jason Baron <jbaron@...hat.com>, Jim Cromie <jim.cromie@...il.com>
Cc:	open list <linux-kernel@...r.kernel.org>
Subject: Re: Bug involving dynamic_debug and '-p' modifier

On Tue, Mar 12, 2013 at 9:14 AM, Andrew Cooks <acooks@...il.com> wrote:
> Hi Jason
>
> When I specify a '-p' modifier in the dynamic debug options in the
> kernel command line, I get a kernel panic during boot. The panic
> happens after userspace starts doing graphical stuff, but I haven't
> been able to pinpoint exactly what.
>
> If I use '=_' instead of '-p', or boot to a recovery mode, or change
> the modifier after booting using debugfs, the panic doesn't occur. For
> example, booting to runlevel 3 with '=_', then flipping the same
> modifier to first to '+p' and then to '-p', before starting X does not
> result in a panic.
>
> Booting to runlevel 3 (or even 1!), with '-p' results in a panic, but
> 'rdshell' is OK.
>
> I also tried the Red Hat kernel (just because it's installed - I
> haven't figured out how to tell the package manager that I don't want
> a kernel). This also panics, but it says that '-p' is not supported.
>
> Please let me know if you need me to do any other tests.
>
> '-p', panic: http://pastebin.com/8yAcBQdY
> '-p', rdshell, no panic: http://pastebin.com/Hi2a7BZA
>
> --
> a.

Jason's mail bounced, so redirecting to Jim Cromie, who made the most
recent significant changes to dynamic_debug...
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