Re: [PATCH] numa, mem-hotplug: Fix stack overflow in numa whenseting kernel nodes to unhotpluggable.
From: Dave Jones
Date: Thu Jan 23 2014 - 17:31:59 EST
On Thu, Jan 23, 2014 at 01:58:24AM -0500, Dave Jones wrote:
> 128 bytes is a pretty small amount of stack though, so I'm just as confused
> as to what the actual bug here is.
> After trying the proposed fix, I got another oops in the early init code..
> <rip> ffffffffbc164b1e next_zones_zonelist
> <rsp> ffffffffbcc01f00
Ok, this is crashing here in next_zones_zonelist...
while (zonelist_zone_idx(z) > highest_zoneidx)
de: 3b 77 08 cmp 0x8(%rdi),%esi
I stuck this at the top of the function..
printk(KERN_ERR "z:%p nodes:%p highest:%d\n", z, nodes, highest_zoneidx);
z: 1d08 nodes: (null) highest:3
Some build tests show..
MAXSMP ( NODESHIFT=10 ) : Bug
NRCPUS=4 & NODESHIFT=10 : Bug
NRCPUS=4 & NODESHIFT=1 : no bug
The middle config test was accidental, I hadn't realised disabling MAXSMP
wouldn't reset NODESHIFT to something sane.
I'll start bisecting, as MAXSMP worked fine until a few days ago.
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