On Mon, Aug 05, 2013 at 02:16:09PM -0700, Andrew Morton wrote: > On Tue, 6 Aug 2013 01:01:28 +0400 Andrew Vagin <avagin@xxxxxxxxxxxxx> 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@xxxxxxxxxx> 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@xxxxxxxxxxxxxxx> [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! Sorry, probably I had to write all these in the initial commit message. I just thought that this patch is an additional part of v3.9-rc1-16204-gf101a94. > > 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? I don't think that so many people use cgroups with limits of the kernel memory. I use the vzctl utility to operate with containers. vzctl limits the kernel memory of containers by default. A container should be started and stoped a few times (five or four) to reproduce the bug. And one more thing is that nf_conntrack should be loaded. It creates a new kmem_cache for each network namespace. Thanks -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>