next-20120604 WARNING: at block/blk-cgroup.c:867

[Valdis Kletnieks]

Seen in my dmesg at boot:

[    0.682289] cryptomgr_test (30) used greatest stack depth: 6344 bytes left
[    0.683288] io scheduler noop registered
[    0.683292] io scheduler deadline registered
[    0.683294] ------------[ cut here ]------------
[    0.683300] WARNING: at block/blk-cgroup.c:867 blkcg_policy_register+0x41/0x10a()
[    0.683302] Hardware name: Latitude E6500
[    0.683305] Modules linked in:
[    0.683308] Pid: 1, comm: swapper/0 Not tainted 3.5.0-rc1-next-20120604 #25
[    0.683310] Call Trace:
[    0.683316]  [<ffffffff8102c7ce>] warn_slowpath_common+0x7e/0x96
[    0.683320]  [<ffffffff8102c7fb>] warn_slowpath_null+0x15/0x17
[    0.683324]  [<ffffffff8123d8a2>] blkcg_policy_register+0x41/0x10a
[    0.683329]  [<ffffffff81d4caca>] ? deadline_init+0x12/0x12
[    0.683332]  [<ffffffff81d4cb0c>] cfq_init+0x42/0x9f
[    0.683337]  [<ffffffff810001fa>] do_one_initcall+0x7a/0x130
[    0.683341]  [<ffffffff81d2fbdc>] do_initcalls+0xa7/0xc9
[    0.683344]  [<ffffffff81d2f5ed>] ? do_early_param+0x87/0x87
[    0.683348]  [<ffffffff81d2fcd4>] kernel_init+0xd6/0x147
[    0.683352]  [<ffffffff81603bb4>] kernel_thread_helper+0x4/0x10
[    0.683356]  [<ffffffff81055f99>] ? finish_task_switch+0x38/0x103
[    0.683360]  [<ffffffff815fc61d>] ? retint_restore_args+0xe/0xe
[    0.683364]  [<ffffffff81d2fbfe>] ? do_initcalls+0xc9/0xc9
[    0.683367]  [<ffffffff81603bb0>] ? gs_change+0xb/0xb
[    0.683376] ---[ end trace e93713a9d40cd06c ]---
[    0.683378] start plist test
[    0.687084] end plist test

Probably relevant...

% zgrep CGR /proc/config.gz
CONFIG_CGROUPS=y
CONFIG_CGROUP_DEBUG=y
CONFIG_CGROUP_FREEZER=y
CONFIG_CGROUP_DEVICE=y
CONFIG_CGROUP_CPUACCT=y
CONFIG_CGROUP_MEM_RES_CTLR=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP=y
CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED=y
# CONFIG_CGROUP_MEM_RES_CTLR_KMEM is not set
CONFIG_CGROUP_PERF=y
CONFIG_CGROUP_SCHED=y
CONFIG_BLK_CGROUP=y
# CONFIG_DEBUG_BLK_CGROUP is not set
# CONFIG_NET_CLS_CGROUP is not set
CONFIG_NETPRIO_CGROUP=m

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