Re: Bug involving dynamic_debug and '-p' modifier

[Andrew Cooks]

On Tue, Mar 12, 2013 at 9:14 AM, Andrew Cooks <acooks@xxxxxxxxx> 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@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/