Re: Kernel stack overflows due to "powerpc: Remove ksp_limit onppc64" with v3.13-rc8 on ppc32 (P2020)

From: Guenter Roeck
Date: Thu Jan 16 2014 - 22:15:41 EST

On 01/16/2014 06:58 PM, Benjamin Herrenschmidt wrote:
On Fri, 2014-01-17 at 10:20 +0800, Kevin Hao wrote:
On Thu, Jan 16, 2014 at 10:05:32AM -0800, Guenter Roeck wrote:
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@xxxxxxxxxxxx>

I assume you or Kevin will take it from there ?


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