From: Michal Hocko <mhocko@kernel.org>
To: Sachin Sant <sachinp@linux.vnet.ibm.com>,
Cristopher Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>,
Linux-Next Mailing List <linux-next@vger.kernel.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [5.6.0-rc2-next-20200218/powerpc] Boot failure on POWER9
Date: Tue, 18 Feb 2020 16:24:41 +0100 [thread overview]
Message-ID: <20200218152441.GH4151@dhcp22.suse.cz> (raw)
In-Reply-To: <35EE65CF-40E3-4870-AEBC-D326977176DA@linux.vnet.ibm.com>
On Tue 18-02-20 20:41:12, Sachin Sant wrote:
>
> >> Yes, I can recreate the same problem with the patch applied on top of
> >> 5.6.0-rc2.
> >
> > And just to make sure. This was with http://lkml.kernel.org/r/fff0e636-4c36-ed10-281c-8cdb0687c839@virtuozzo.com
> > right?
> >
> Yes, the same patch.
>
> > If yes, is it possible that the specific node is somehow crippled (e.g.
> > some nodes don't have any memory and thus the allocator blows up)? In
> > other words what is the numa topology? (numactl -H)
> >
>
> Here is the o/p of numactl
>
> # numactl -H
> available: 2 nodes (0-1)
> node 0 cpus:
> node 0 size: 0 MB
> node 0 free: 0 MB
OK, so what I expected. The node0 is memory less or simply not present
at all. Fun!
Anyway, I do not think it is expected that kmalloc_node just blows up
on those nodes. The page allocator simply falls back to the closest
node. Something for kmalloc maintainers I believe.
A short summary. kmalloc_node blows up when trying to allocate from a
memory less node.
> node 1 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
> node 1 size: 35247 MB
> node 1 free: 30907 MB
> node distances:
> node 0 1
> 0: 10 40
> 1: 40 10
> #
>
> Thanks
> -Sachin
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-02-18 15:24 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 10:45 [5.6.0-rc2-next-20200218/powerpc] Boot failure on POWER9 Sachin Sant
2020-02-18 10:50 ` Kirill Tkhai
2020-02-18 11:01 ` Kirill Tkhai
2020-02-18 11:35 ` Kirill Tkhai
2020-02-18 11:40 ` Sachin Sant
2020-02-18 11:55 ` Michal Hocko
2020-02-18 14:00 ` Sachin Sant
2020-02-18 14:26 ` Michal Hocko
2020-02-18 15:11 ` Sachin Sant
2020-02-18 15:24 ` Michal Hocko [this message]
2020-02-22 3:38 ` Christopher Lameter
2020-02-24 8:58 ` Michal Hocko
2020-02-26 18:25 ` Christopher Lameter
2020-02-26 18:41 ` Michal Hocko
2020-02-26 18:44 ` Christopher Lameter
2020-02-26 19:01 ` Michal Hocko
2020-02-26 20:31 ` David Rientjes
2020-02-26 20:52 ` Michal Hocko
2020-02-26 21:45 ` Vlastimil Babka
2020-02-26 22:29 ` Vlastimil Babka
2020-02-27 12:12 ` Michal Hocko
2020-02-27 16:00 ` Sachin Sant
2020-02-27 16:16 ` Vlastimil Babka
2020-02-27 18:26 ` Michal Hocko
2020-03-10 15:01 ` Michal Hocko
2020-03-12 12:18 ` Michael Ellerman
2020-03-12 16:51 ` Sachin Sant
2020-03-13 10:48 ` Michael Ellerman
2020-03-13 11:12 ` Srikar Dronamraju
2020-03-13 11:35 ` Vlastimil Babka
2020-03-14 8:10 ` Sachin Sant
2020-02-27 12:02 ` Michal Hocko
2020-02-18 11:38 ` Sachin Sant
2020-02-18 11:53 ` Kirill Tkhai
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