Issue

• RHEV Hypervisor locks up and reboots when ksmd is enabled
• qemu-kvm and ksmd processes get stuck

Jun  9 16:57:58 example kernel: Pid: 507, comm: ksmd Not tainted 2.6.32-431.11.2.el6.x86_64 #1 HP ProLiant BL685c G7
Jun  9 16:57:58 example kernel: RIP: 0010:[<ffffffff810b31da>]  [<ffffffff810b31da>] generic_exec_single+0x8a/0xc0
..
Jun  9 16:57:58 example kernel: Process ksmd (pid: 507, threadinfo ffff8804388a6000, task ffff8804388a5540)
Jun  9 16:57:58 example kernel: Stack:
..
Jun  9 16:57:58 example kernel: Call Trace:
Jun  9 16:57:58 example kernel: [<ffffffffa049e0a0>] ? ack_flush+0x0/0x10 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa049e0a0>] ? ack_flush+0x0/0x10 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffff810b3442>] ? smp_call_function_single+0x152/0x160
Jun  9 16:57:58 example kernel: [<ffffffffa049e0a0>] ? ack_flush+0x0/0x10 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffff810b39a2>] ? smp_call_function_many+0x222/0x260
Jun  9 16:57:58 example kernel: [<ffffffffa04a3a3d>] ? make_all_cpus_request+0xdd/0x120 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa04a3ab8>] ? kvm_flush_remote_tlbs+0x18/0x30 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa04bba18>] ? kvm_set_pte_rmapp+0xd8/0x170 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa04b9084>] ? kvm_handle_hva+0xa4/0x130 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa04bb940>] ? kvm_set_pte_rmapp+0x0/0x170 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa04b9151>] ? kvm_set_spte_hva+0x21/0x30 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffffa04a031b>] ? kvm_mmu_notifier_change_pte+0x5b/0x90 [kvm]
Jun  9 16:57:58 example kernel: [<ffffffff8116ab8f>] ? __mmu_notifier_change_pte+0x4f/0xa0
Jun  9 16:57:58 example kernel: [<ffffffff8116cb31>] ? try_to_merge_with_ksm_page+0x321/0x660
Jun  9 16:57:58 example kernel: [<ffffffff8116d414>] ? ksm_scan_thread+0x5a4/0x1120
Jun  9 16:57:58 example kernel: [<ffffffff8109b290>] ? autoremove_wake_function+0x0/0x40
Jun  9 16:57:58 example kernel: [<ffffffff8116ce70>] ? ksm_scan_thread+0x0/0x1120
Jun  9 16:57:58 example kernel: [<ffffffff8109aee6>] ? kthread+0x96/0xa0
Jun  9 16:57:58 example kernel: [<ffffffff8100c20a>] ? child_rip+0xa/0x20
Jun  9 16:57:58 example kernel: [<ffffffff8109ae50>] ? kthread+0x0/0xa0