linux-kernel - Re: [patch 0/7] improve memcg oom killer robustness v2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130918183617.GD3421@dhcp22.suse.cz>
Date:	Wed, 18 Sep 2013 20:36:17 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	azurIt <azurit@...ox.sk>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/7] improve memcg oom killer robustness v2

On Wed 18-09-13 20:02:39, azurIt wrote:
> > CC: "Johannes Weiner" <hannes@...xchg.org>, "Andrew Morton" <akpm@...ux-foundation.org>, "David Rientjes" <rientjes@...gle.com>, "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>, "KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>, linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org, linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
> >On Wed 18-09-13 16:33:06, azurIt wrote:
> >> > CC: "Johannes Weiner" <hannes@...xchg.org>, "Andrew Morton" <akpm@...ux-foundation.org>, "David Rientjes" <rientjes@...gle.com>, "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>, "KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>, linux-mm@...ck.org, cgroups@...r.kernel.org, x86@...nel.org, linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
> >> >On Wed 18-09-13 16:03:04, azurIt wrote:
> >> >[..]
> >> >> I was finally able to get stack of problematic process :) I saved it
> >> >> two times from the same process, as Michal suggested (i wasn't able to
> >> >> take more). Here it is:
> >> >> 
> >> >> First (doesn't look very helpfull):
> >> >> [<ffffffffffffffff>] 0xffffffffffffffff
> >> >
> >> >No it is not.
> >> > 
> >> >> Second:
> >> >> [<ffffffff810e17d1>] shrink_zone+0x481/0x650
> >> >> [<ffffffff810e2ade>] do_try_to_free_pages+0xde/0x550
> >> >> [<ffffffff810e310b>] try_to_free_pages+0x9b/0x120
> >> >> [<ffffffff81148ccd>] free_more_memory+0x5d/0x60
> >> >> [<ffffffff8114931d>] __getblk+0x14d/0x2c0
> >> >> [<ffffffff8114c973>] __bread+0x13/0xc0
> >> >> [<ffffffff811968a8>] ext3_get_branch+0x98/0x140
> >> >> [<ffffffff81197497>] ext3_get_blocks_handle+0xd7/0xdc0
> >> >> [<ffffffff81198244>] ext3_get_block+0xc4/0x120
> >> >> [<ffffffff81155b8a>] do_mpage_readpage+0x38a/0x690
> >> >> [<ffffffff81155ffb>] mpage_readpages+0xfb/0x160
> >> >> [<ffffffff811972bd>] ext3_readpages+0x1d/0x20
> >> >> [<ffffffff810d9345>] __do_page_cache_readahead+0x1c5/0x270
> >> >> [<ffffffff810d9411>] ra_submit+0x21/0x30
> >> >> [<ffffffff810cfb90>] filemap_fault+0x380/0x4f0
> >> >> [<ffffffff810ef908>] __do_fault+0x78/0x5a0
> >> >> [<ffffffff810f2b24>] handle_pte_fault+0x84/0x940
> >> >> [<ffffffff810f354a>] handle_mm_fault+0x16a/0x320
> >> >> [<ffffffff8102715b>] do_page_fault+0x13b/0x490
> >> >> [<ffffffff815cb87f>] page_fault+0x1f/0x30
> >> >> [<ffffffffffffffff>] 0xffffffffffffffff
> >> >
> >> >This is the direct reclaim path. You are simply running out of memory
> >> >globaly. There is no memcg specific code in that trace.
> >> 
> >> 
> >> No, i'm not. Here is htop and server graphs from this case:
> >
> >Bahh, right you are. I didn't look at the trace carefully. It is
> >free_more_memory which calls the direct reclaim shrinking.
> >
> >Sorry about the confusion
> 
> 
> Happens again and this time i got 5x this:
> [<ffffffffffffffff>] 0xffffffffffffffff
> 
> :( it's probably looping very fast so i need to have some luck

Or it is looping in the userspace.
-- 
Michal Hocko
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/