First bad commit is

commit ab9d926aa9e6a899a94d7d4719389044b57da48a
Merge: c376c3f 7d1f9ae
Author: Christoffer Dall <c.dall@virtualopensystems.com>
Date:   Sun Jan 20 19:07:41 2013 -0500

    Merge tag 'v3.8-rc4' into kvm-arm-master
    
    Linux 3.8-rc4

[    1.780925] PASSED
[    1.870041] Testing tracer branch: [    1.960072] ------------[ cut here ]------------
[    1.960579] WARNING: at /c/kernel-tests/src/linux/kernel/lockdep.c:3532 check_flags+0xa0/0x154()
[    1.961366] Hardware name: Bochs
[    1.961740] Pid: 0, comm: swapper/1 Not tainted 3.8.0-rc4-00478-g24750b7 #8
[    1.962393] Call Trace:

[    1.962693]  [<c105e740>] warn_slowpath_common+0x63/0x78
[    1.963698]  [<c1099cb4>] ? check_flags+0xa0/0x154
[    1.964469]  [<c105e7e6>] warn_slowpath_null+0x14/0x18
[    1.965276]  [<c1099cb4>] check_flags+0xa0/0x154
[    1.966035]  [<c109bdb3>] lock_acquire+0x31/0xd8
[    1.966796]  [<c108ade6>] rcu_read_lock+0x26/0x2b
[    1.967587]  [<c108adc0>] ? rcu_read_unlock+0x23/0x23
[    1.968363]  [<c108d0b3>] run_rebalance_domains+0x55/0x169
[    1.969226]  [<c1065418>] __do_softirq+0xd4/0x20b
[    1.969997]  [<c1065344>] ? local_bh_enable_ip+0xf/0xf
[    1.970000]  <IRQ>  [<c1065651>] ? irq_exit+0x46/0x75
[    1.970000]  [<c104c8c6>] ? smp_apic_timer_interrupt+0x63/0x71
[    1.970000]  [<c14eabc6>] ? apic_timer_interrupt+0x36/0x3c
[    1.970000]  [<c10900e0>] ? pm_qos_power_release+0x13/0x22
[    1.970000]  [<c1052fd6>] ? native_safe_halt+0x5/0x7
[    1.970000]  [<c103aa44>] ? default_idle+0x6d/0xa2
[    1.970000]  [<c103b0ff>] ? cpu_idle+0xb3/0xe1
[    1.970000]  [<c14dbe61>] ? start_secondary+0x238/0x23f
[    1.970000] ---[ end trace 3137d310eb82808d ]---

git bisect start 24750b7b09996fb2e9f28b4032e8d65200cf6c9b 99f8767570e07e24af32f93309f724107a335283 --
git bisect good   #    12  2013-01-30 11:38:05  KVM: ARM: Remove page requirements for hyp code
git bisect good   #    13  2013-01-30 11:48:21  KVM: ARM: Limit vgic read/writes to load/store length
git bisect  bad   #     0  2013-01-30 11:52:15  Merge remote-tracking branch 'mrutland/clocks/broadcast-timer' into kvm-arm64/kvm-prereq-merged
git bisect  bad   #     0  2013-01-30 11:54:55  ARM: KVM: abstract HSR_EC_IABT away
git bisect  bad   #     0  2013-01-30 11:57:02  KVM: ARM: Inject undefined interrupt for unknown HVC
git bisect good   #    15  2013-01-30 12:03:17  KVM: ARM: Compile idmap with +VIRT_EXT and -LPAE
git bisect good   #    11  2013-01-30 12:07:52  KVM: ARM: Document kvm_call_hyp and fix __kvm_vcpu_run return value
git bisect  bad   #     0  2013-01-30 12:10:25  Merge tag 'v3.8-rc4' into kvm-arm-master
git bisect good   #    10  2013-01-30 12:21:17  KVM: ARM: Update comments and defines for KVM_ARM_SET_DEVICE_ADDR
git bisect good   #    30  2013-01-30 12:26:56  KVM: ARM: Update comments and defines for KVM_ARM_SET_DEVICE_ADDR
git bisect good   #    30  2013-01-30 12:49:00  Linux 3.8-rc4
git bisect good   #    30  2013-01-30 12:56:40  Add linux-next specific files for 20130125

Thanks,
Fengguang