linux-kernel - Re: Bug involving dynamic

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Date:	Sat, 16 Mar 2013 22:42:46 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	Andrew Cooks <acooks@...il.com>
CC:	Jim Cromie <jim.cromie@...il.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: Bug involving dynamic_debug and '-p' modifier

Hi Andrew,

Thanks for the bug report. I need to send a patch to update the maintainers
file...

Haven't had a chance to look into this yet. Will get back to you.

Thanks,

-Jason



On 03/11/2013 10:28 PM, Andrew Cooks wrote:
> 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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