Re: 2.6.15-mm4 failure on power5

Dave C Boutcher
2006-01-18T03:32:45Z

On Wed, Jan 18, 2006 at 11:19:36AM +1100, Michael Ellerman wrote:
> It booted fine _with_ the patch applied, with DEBUG_MUTEXES=y and n.
>
> Boutcher, to be clear, you can't boot with kernel-kernel-cpuc-to-mutexes.patch
> applied and DEBUG_MUTEXES=y ?
>
> But if you revert kernel-kernel-cpuc-to-mutexes.patch it boots ok?
>
> This is looking quite similar to another hang we're seeing on Power4 iSeries
> on mainline git:
> http://ozlabs.org/pipermail/linuxppc64-dev/2006-January/007679.html

Correct...I die in exactly the same place every time with
DEBUG_MUTEXES=Y. I posted a backtrace that points into the _lock_cpu
code, but I haven't really dug into the issue yet. I believe this is
very timing related (Serge was dying slightly differently).

--
Dave Boutcher