Re: Kernel stack overflows due to "powerpc: Remove ksp_limit on ppc64" with v3.13-rc8 on ppc32 (P2020)

On 01/16/2014 06:58 PM, Benjamin Herrenschmidt wrote:

On Fri, 2014-01-17 at 10:20 +0800, Kevin Hao wrote:

quoted

On Thu, Jan 16, 2014 at 10:05:32AM -0800, Guenter Roeck wrote:

quoted

Hi all,

I am getting kernel stack overflows with v3.13-rc8 on a system with P2020 CPU.
The kernel is patched for the target, but I don't think that is related.
Stack overflows are in different areas, but always in calls from __do_softirq.

Crashes happen reliably either during boot or if I put any kind of load
onto the system.

How about the following fix:

Wow. I've been staring at that code for 15mn this morning and didn't
spot it ! Nice catch :-)

Yes, great catch! That fixes the problem.

Tested-by: Guenter Roeck <linux@roeck-us.net>

I assume you or Kevin will take it from there ?

Thanks,
Guenter