On Wed, 23 Nov 2011 at 11:18, Benjamin Herrenschmidt wrote:
> I'd say only this one liner for now, just don't do slabinfo :-) I just
> want to see whether your network + heavy IO load problem goes away with
> that one patch.

OK, with Christoph's patch applied, 3.2.0-rc2-00274-g6fe4c6d-dirty survives 
on this machine, with the disk & cpu workload that caused the machine to 
panic w/o the patch. Load was at 4-5 this time, which is expected for this 
box. I'll run a few more tests later on, but it seems ok for now.

I couldn't resist and ran "slabinfo" anyway (after the workload!) - the 
box survived, nothing was printed in syslog either. Output attached.

Thanks!
Christian.

--- linux-2.6.orig/mm/slub.c	2011-11-21 21:15:41.575673204 -0600
+++ linux-2.6/mm/slub.c	2011-11-21 21:16:33.442336849 -0600
@@ -1969,7 +1969,7 @@
 		page->pobjects = pobjects;
 		page->next = oldpage;

-	} while (this_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
+	} while (irqsafe_cpu_cmpxchg(s->cpu_slab->partial, oldpage, page) != oldpage);
 	stat(s, CPU_PARTIAL_FREE);
 	return pobjects;
 }

-- 
BOFH excuse #6:

global warming