Greetings,

I got the below dmesg and the first bad commit is

https://github.com/alexshi/power-scheduling.git single-balance
commit 98564060e5c360908d93f61a78ccbef4a082d3c2
Author:     Alex Shi <alex.shi@linaro.org>
AuthorDate: Tue Feb 18 21:01:54 2014 +0800
Commit:     Alex Shi <alex.shi@linaro.org>
CommitDate: Tue Feb 18 21:33:06 2014 +0800

    sched/balance: add balance_interval to tuning top level balance frequency
    
    Since central balance stains less cpu cache as current balance, we
    can set the balance interval more short.
    
    Signed-off-by: Alex Shi <alex.shi@linaro.org>

[    1.323527] WARNING: CPU: 0 PID: 8 at kernel/sched/core.c:2939 rt_mutex_setprio+0x646/0x8a3()

git bisect start 0d8b92f526636f83e3e9a295a5a0ee1a2bdcb09d 6d0abeca3242a88cab8232e4acd7e2bf088f3bc2 --
git bisect  bad 7f3b48eb13c1d5daee3f7c93c0f69751b9c3ce85  # 06:22      1-      6  Merge 'hid/for-next' into devel-hourly-2014021904
git bisect  bad 722206b26319203cac0c4ba4bf252e5af46508db  # 06:29      4-      7  Merge 'keystone/keystone/master' into devel-hourly-2014021904
git bisect  bad 9473e52410408e4e1721b1d4a7056395374a69bc  # 06:35      1-      4  Merge 'nfs/testing' into devel-hourly-2014021904
git bisect good 3925e3c984d5ab31fe6dd0ee27ed2d50c8d512d9  # 06:41     33+      7  Merge 'microblaze/next' into devel-hourly-2014021904
git bisect good e30e77323f610bfb2d7d6fe5498a50f0c5bd2087  # 06:45     33+     13  Merge 'input/next' into devel-hourly-2014021904
git bisect  bad 58311fcd94b5f78faaa55959cbfcf8fbc4c7bac0  # 06:52      4-      5  Merge 'alexshi/single-balance' into devel-hourly-2014021904
git bisect good 4a5d7c9f371d437e80369739bc7c38743f0d87c3  # 06:57     60+     17  sched: rename update_*_cpu_load
git bisect good 480c3ba7685296b8da892020d408223e7abdc70b  # 07:01     60+     15  sched: remove un-used functions
git bisect good 0e32dab5df39cfb1be9a937d67c877404b964324  # 07:06     60+     18  sched/balance: rebuild ovutil tree after task moving
git bisect  bad 98564060e5c360908d93f61a78ccbef4a082d3c2  # 07:12      4-      6  sched/balance: add balance_interval to tuning top level balance frequency
git bisect good 34c6c7844fd7ac6b7636614534d83c1099ab6fc7  # 07:17     60+     19  sched/balance: add llc balance interval
# first bad commit: [98564060e5c360908d93f61a78ccbef4a082d3c2] sched/balance: add balance_interval to tuning top level balance frequency
git bisect good 34c6c7844fd7ac6b7636614534d83c1099ab6fc7  # 07:22    180+     62  sched/balance: add llc balance interval
git bisect  bad 0d8b92f526636f83e3e9a295a5a0ee1a2bdcb09d  # 07:22      0-     19  0day head guard for 'devel-hourly-2014021904'
git bisect good 7d4b82cdf527b65f50cbcde5d74dc4fc5ed8d1dc  # 07:31    180+     32  Revert "sched/balance: add balance_interval to tuning top level balance frequency"
git bisect good 805937cf45f9a9933e6b8e5c6660406e977a9a23  # 07:39    180+     24  Merge tag 'ext4_for_linus_stable' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
git bisect good 02d56d4d19b8aa889c856287729d89c805ee42ec  # 08:45    180+     57  Add linux-next specific files for 20140218

Thanks,
Fengguang