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SubjectRe: [PATCHSET] blkcg: accumulated blkcg updates
On Mon, Mar 05, 2012 at 01:08:36PM -0800, Tejun Heo wrote:
> On Mon, Mar 05, 2012 at 01:07:26PM -0800, Tejun Heo wrote:
> > Hello,
> >
> > Vivek reported two different crashes. Patch 17.5 added and patch 27
> > updated to address both issues. Andrew reminded me a deeper problem
> > with percpu mempool approach and I'll go with Vivek's delayed
> > allocation patch. For now, I'm dropping the stats patches.
> >
> > I posted the two updated patches but holding off reposting all patches
> > which now generate conflicts due to the updates. git branches are
> > updated.
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-stacking
> > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git unified-blkg
> > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-kill-pn
> >
> > Note that blkcg-stats is dropped for now. I'll repost the series
> > later when Jens is ready to pull.
>
> Ooh, the commit ID of blkcg-stacking, which is on top of all other
> pending commits is fcddfec4ea9067ae6c963682dcdb5ddf783a3ff9.
>
> Vivek, can you please verify the crashes you were seeing are gone now?

Hi Tejun,

Built and booted into blkcg-stacking. Looks likd old crashes on reading
file and scheduler change are fixed.

My system is hanging during reboot. Last message I see is "Detaching DM
devices" and nothing happens after that. I shall have to do some more
testing to figure out when did that start happening.

I have been seeing following on boot though.

[ 2.893244] ===============================
[ 2.897492] [ INFO: suspicious RCU usage. ]
[ 2.901741] 3.3.0-rc3-tejun-misc+ #27 Not tainted
[ 2.906509] -------------------------------
[ 2.910760] kernel/cgroup.c:1723 suspicious rcu_dereference_check()
usage!
[ 2.917696]
[ 2.917697] other info that might help us debug this:
[ 2.917698]
[ 2.925919]
[ 2.925920] rcu_scheduler_active = 1, debug_locks = 0
[ 2.932588] no locks held by swapper/0/1.
[ 2.936664]
[ 2.936664] stack backtrace:
[ 2.941180] Pid: 1, comm: swapper/0 Not tainted 3.3.0-rc3-tejun-misc+
#27
[ 2.948030] Call Trace:
[ 2.950550] [<ffffffff81093ba5>] lockdep_rcu_suspicious+0xe5/0x100
[ 2.956883] [<ffffffff810adfbe>] cgroup_path+0x1be/0x200
[ 2.962350] [<ffffffff8130af55>] blkg_lookup_create+0x1d5/0x490
[ 2.968422] [<ffffffff8130d3b5>] blk_throtl_init+0x135/0x220
[ 2.974237] [<ffffffff8130d369>] ? blk_throtl_init+0xe9/0x220
[ 2.980141] [<ffffffff8130b6e1>] blkcg_init_queue+0x31/0x90
[ 2.985874] [<ffffffff812f2c2a>] blk_alloc_queue_node+0x22a/0x270
[ 2.992120] [<ffffffff812f2c83>] blk_alloc_queue+0x13/0x20
[ 2.997761] [<ffffffff81447cba>] brd_alloc+0x7a/0x1b0
[ 3.002968] [<ffffffff81f0163e>] brd_init+0xc6/0x1ce
[ 3.008086] [<ffffffff81f01578>] ? register_node_type+0x19/0x19
[ 3.014167] [<ffffffff810001cf>] do_one_initcall+0x3f/0x170
[ 3.019893] [<ffffffff81ed4c34>] kernel_init+0xc9/0x143
[ 3.025273] [<ffffffff81844e24>] kernel_thread_helper+0x4/0x10
[ 3.031258] [<ffffffff8183b65d>] ? retint_restore_args+0xe/0xe
[ 3.037244] [<ffffffff81ed4b6b>] ? start_kernel+0x375/0x375
[ 3.042968] [<ffffffff81844e20>] ? gs_change+0xb/0xb

Thanks
Vivek


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