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Date: Mon, 5 Aug 2013 14:16:09 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Andrew Vagin <avagin@...allels.com> Cc: Andrey Vagin <avagin@...nvz.org>, <linux-mm@...ck.org>, <cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Glauber Costa <glommer@...nvz.org>, Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...e.cz>, Balbir Singh <bsingharora@...il.com>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Konstantin Khlebnikov <khlebnikov@...nvz.org>, <stable@...r.kernel.org> Subject: Re: [PATCH] memcg: don't initialize kmem-cache destroying work for root caches On Tue, 6 Aug 2013 01:01:28 +0400 Andrew Vagin <avagin@...allels.com> wrote: > On Mon, Aug 05, 2013 at 01:05:30PM -0700, Andrew Morton wrote: > > On Mon, 5 Aug 2013 20:09:40 +0400 Andrey Vagin <avagin@...nvz.org> wrote: > > > > > struct memcg_cache_params has a union. Different parts of this union > > > are used for root and non-root caches. A part with destroying work is > > > used only for non-root caches. > > > > > > I fixed the same problem in another place v3.9-rc1-16204-gf101a94, but > > > didn't notice this one. > > > > > > Cc: <stable@...r.kernel.org> [3.9.x] > > > > hm, why the cc:stable? > > Because this patch fixes the kernel panic: > > [ 46.848187] BUG: unable to handle kernel paging request at 000000fffffffeb8 > [ 46.849026] IP: [<ffffffff811a484c>] kmem_cache_destroy_memcg_children+0x6c/0xc0 > [ 46.849092] PGD 0 > [ 46.849092] Oops: 0000 [#1] SMP OK, pretty soon we'll have a changelog! What does one do to trigger this oops? The bug has been there since 3.9, so the means-of-triggering must be quite special? -- 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/
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