Description of problem: I have an f18 machine that is connected to an ovirt engine 3.2 stable it is fully updated [root@cinteg02 log]# uname -a Linux cinteg02.ci.lab.tlv.redhat.com 3.8.3-201.fc18.x86_64 #1 SMP Thu Mar 14 21:28:05 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux it is running vdsm+nested kvm hook every few minutes the following error appears on the screen: Message from syslogd@cinteg02 at Mar 20 16:57:32 ... kernel:[ 627.323524] BUG: soft lockup - CPU#6 stuck for 23s! [sh:1951] the serever gets hiccupsand the server freezes and stop responding.
snippet from dmesg: 767.108800] BUG: soft lockup - CPU#6 stuck for 22s! [sh:1951] [ 767.109421] Modules linked in: nfsv3 nfs_acl nfs lockd sunrpc dns_resolver fscache 8021q garp bonding ip6table_filter ip6_tables ebtable_nat ebtables softdog bridge stp llc be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i cxgb3 mdio libcxgbi ib_iser rdma_cm ib_addr iw_cm ib_cm ib_sa ib_mad ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_service_time xt_physdev nf_conntrack_ipv4 nf_defrag_ipv4 xt_multiport xt_conntrack nf_conntrack dm_multipath joydev iTCO_wdt iTCO_vendor_support igb i7core_edac i2c_i801 ptp pps_core edac_core ioatdma lpc_ich dca mfd_core vhost_net tun macvtap macvlan coretemp dcdbas binfmt_misc crc32c_intel ghash_clmulni_intel kvm_intel microcode kvm ast i2c_algo_bit drm_kms_helper ttm drm i2c_core [ 767.109461] CPU 6 [ 767.109463] Pid: 1951, comm: sh Not tainted 3.8.3-201.fc18.x86_64 #1 Dell C6100 /0D61XP [ 767.109465] RIP: 0010:[<ffffffff8106e21a>] [<ffffffff8106e21a>] lock_timer_base.isra.37+0x2a/0x70 [ 767.109471] RSP: 0018:ffff8803166bdcd8 EFLAGS: 00000246 [ 767.109473] RAX: ffff8803166bdfd8 RBX: ffff88033ffedb00 RCX: 0000000000000080 [ 767.109474] RDX: 0000000000000000 RSI: ffff8803166bdd10 RDI: ffff880316984ce8 [ 767.109475] RBP: ffff8803166bdcf8 R08: ffff8803332d6b80 R09: 00000000ffffffff [ 767.109476] R10: 0000000000016b80 R11: ffffffff812ebe42 R12: 0000000000000000 [ 767.109478] R13: ffff8803166bdc88 R14: ffff88033ffedb08 R15: 0000000000000000 [ 767.109479] FS: 00007f1e51b24740(0000) GS:ffff8803332c0000(0000) knlGS:0000000000000000 [ 767.109480] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 767.109482] CR2: 00007f1e5119f100 CR3: 000000032c914000 CR4: 00000000000007e0 [ 767.109483] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 767.109484] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 767.109486] Process sh (pid: 1951, threadinfo ffff8803166bc000, task ffff880316729760) [ 767.109486] Stack: [ 767.109487] ffff880316984cd0 ffff880316984c00 ffff88032a763e80 ffff880316984d20 [ 767.109490] ffff8803166bdd28 ffffffff8106eb20 ffff88033ffecd80 ffff880300000000 [ 767.109492] ffff880316984cd0 ffff880316984c00 ffff8803166bdd48 ffffffff8106ebca [ 767.109494] Call Trace: [ 767.109497] [<ffffffff8106eb20>] try_to_del_timer_sync+0x20/0x70 [ 767.109499] [<ffffffff8106ebca>] del_timer_sync+0x5a/0x70 [ 767.109503] [<ffffffff812f1126>] cfq_exit_queue+0x36/0xf0 [ 767.109506] [<ffffffff812cfe58>] elevator_exit+0x38/0x60 [ 767.109508] [<ffffffff812d0718>] elevator_change+0x148/0x230 [ 767.109511] [<ffffffff812d131b>] elv_iosched_store+0x2b/0x60 [ 767.109514] [<ffffffff812d94d4>] queue_attr_store+0x64/0xc0 [ 767.109517] [<ffffffff81211108>] sysfs_write_file+0xd8/0x150 [ 767.109521] [<ffffffff8119d9ac>] vfs_write+0xac/0x180 [ 767.109523] [<ffffffff8119dcf2>] sys_write+0x52/0xa0 [ 767.109527] [<ffffffff8165408e>] ? do_page_fault+0xe/0x10 [ 767.109530] [<ffffffff81658699>] system_call_fastpath+0x16/0x1b [ 767.109531] Code: 00 66 66 66 66 90 55 48 89 e5 48 83 ec 20 4c 89 6d f0 4c 89 75 f8 49 89 fd 48 89 5d e0 4c 89 65 e8 49 89 f6 49 8b 5d 00 49 89 dc <49> 83 e4 fc 74 31 4c 89 e7 e8 78 1e 5e 00 49 89 06 49 3b 5d 00
*** This bug has been marked as a duplicate of bug 902012 ***