* Bug involving dynamic_debug and '-p' modifier
@ 2013-03-12 1:14 Andrew Cooks
2013-03-12 2:28 ` Andrew Cooks
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Cooks @ 2013-03-12 1:14 UTC (permalink / raw)
To: Jason Baron; +Cc: open list
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.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Bug involving dynamic_debug and '-p' modifier
2013-03-12 1:14 Bug involving dynamic_debug and '-p' modifier Andrew Cooks
@ 2013-03-12 2:28 ` Andrew Cooks
2013-03-17 2:42 ` Jason Baron
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Cooks @ 2013-03-12 2:28 UTC (permalink / raw)
To: Jason Baron, Jim Cromie; +Cc: open list
On Tue, Mar 12, 2013 at 9:14 AM, Andrew Cooks <acooks@gmail.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...
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Bug involving dynamic_debug and '-p' modifier
2013-03-12 2:28 ` Andrew Cooks
@ 2013-03-17 2:42 ` Jason Baron
0 siblings, 0 replies; 3+ messages in thread
From: Jason Baron @ 2013-03-17 2:42 UTC (permalink / raw)
To: Andrew Cooks; +Cc: Jim Cromie, open list
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@gmail.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...
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-03-17 2:50 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-03-12 1:14 Bug involving dynamic_debug and '-p' modifier Andrew Cooks
2013-03-12 2:28 ` Andrew Cooks
2013-03-17 2:42 ` Jason Baron
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox