From: Dave Jones <davej@redhat.com>
To: Tang Chen <tangchen@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
akpm@linux-foundation.org, zhangyanfei@cn.fujitsu.com,
guz.fnst@cn.fujitsu.com, x86@kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] numa, mem-hotplug: Fix stack overflow in numa when seting kernel nodes to unhotpluggable.
Date: Tue, 28 Jan 2014 01:53:16 -0500 [thread overview]
Message-ID: <20140128065316.GB27636@redhat.com> (raw)
In-Reply-To: <52E73D61.8000304@cn.fujitsu.com>
On Tue, Jan 28, 2014 at 01:17:21PM +0800, Tang Chen wrote:
> Seeing from your earlier mail, it crashed at:
>
> 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);
>
> and got
>
> z: 1d08 nodes: (null) highest:3
>
>
> nodes=null and highest=3, they are correct. When looking into
> next_zones_zonelist(),
> I cannot see why it crashed. So, can you print the zone id in the
> for_each_zone_zonelist() loop in nr_free_zone_pages() ?
> I want to know why it crashed. A NULL pointer ? Which one ?
It's not so easy further in the function, because the oops scrolls off
any useful printks, there's no scrollback, and no logging..
I even tried adding some udelays to slow things down (and using boot_delay)
but that makes things just hang seemingly indefinitly.
What about that 'z' ptr though ? 0x1d08 seems like a strange address
for us to have a structure at, though I'm not too familiar with the early
boot code, so maybe we do have something down there ?
Dave
next prev parent reply other threads:[~2014-01-28 6:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-23 5:49 [PATCH] numa, mem-hotplug: Fix stack overflow in numa when seting kernel nodes to unhotpluggable Tang Chen
2014-01-23 6:01 ` Dave Jones
2014-01-23 6:05 ` Andrew Morton
2014-01-23 6:06 ` David Rientjes
2014-01-23 6:13 ` Dave Jones
2014-01-23 6:15 ` David Rientjes
2014-01-23 6:58 ` Dave Jones
2014-01-23 22:31 ` Dave Jones
2014-01-27 7:29 ` Tang Chen
2014-01-27 14:52 ` Dave Jones
2014-01-23 6:36 ` Tang Chen
2014-01-28 0:32 ` David Rientjes
2014-01-28 1:01 ` Tang Chen
2014-01-28 2:55 ` Dave Jones
2014-01-28 3:14 ` Tang Chen
2014-01-28 3:24 ` Tang Chen
2014-01-28 3:55 ` Dave Jones
2014-01-28 4:47 ` Tang Chen
2014-01-28 4:47 ` Dave Jones
2014-01-28 5:17 ` Tang Chen
2014-01-28 6:53 ` Dave Jones [this message]
2014-01-28 5:31 ` Tang Chen
2014-01-28 7:10 ` Tang Chen
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