Sporadic kernel panic on Lenovo T420s resume from S3

Sporadic kernel panic on Lenovo T420s resume from S3

[Thilo-Alexander Ginkel]

Hi there,

recently, my Lenovo ThinkPad T420s has been sporadically crashing
after waking up the machine from ACPI S3. The system locks up hard,
i.e., MagicSysRq no longer works, but at least a dump is printed to
the console. The process that is crashing is a kworker process, the
topmost method on the call stack is "wq_worker_sleeping".

The remaining call stack is available (as a photograph) at:
https://secure.tgbyte.de/dropbox/ieNiema6.jpg

Unfortunately, the top of the panic is not visible and scrolling back
does not work.

Some further details:

$ uname -a
Linux orion 3.1.0-0301rc9-generic #201110050905 SMP Wed Oct 5 09:15:03
UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

Kernel config: https://secure.tgbyte.de/dropbox/config-3.1.0-0301rc9-generic

Any ideas?

Thanks,
Thilo

Re: Sporadic kernel panic on Lenovo T420s resume from S3

[Thilo-Alexander Ginkel]

Hi there,

On Mon, Oct 10, 2011 at 21:08, Thilo-Alexander Ginkel <thilo@ginkel.com> wrote:
> recently, my Lenovo ThinkPad T420s has been sporadically crashing
> after waking up the machine from ACPI S3. The system locks up hard,
> i.e., MagicSysRq no longer works, but at least a dump is printed to
> the console. The process that is crashing is a kworker process, the
> topmost method on the call stack is "wq_worker_sleeping".
>
> The remaining call stack is available (as a photograph) at:
> https://secure.tgbyte.de/dropbox/ieNiema6.jpg
>
> Unfortunately, the top of the panic is not visible and scrolling back
> does not work.

The issue is still happening with a mainline 3.1 kernel (same dump as
above). Is there anyting I can do to capture more details? The machine
locks up completely, so MagicSysRq does not help when trying to
preserve the error log. Are there any mechanisms to persist some error
information when regular file systems are not available (RTC will
probably not suffice). Netconsole will be tricky to use as I am
typically on the road when using my laptop with no additional log sink
available.

Thanks,
Thilo