[CentOS] possible kernel bug?

Hello,

i'm using centos 6.5. It was running fine for months. 2-3 days ago I
updated the system incl. kernel, but now the system is restarting once a
day caused by a panic.

--
<1>BUG: unable to handle kernel paging request at 000000004d000001
<1>IP: [<ffffffff810657f3>] load_balance_fair+0x2a3/0x300
<4>PGD 0
<4>Oops: 0000 [#1] SMP
<4>last sysfs file: /sys/kernel/mm/ksm/run
<4>CPU 0
<4>Modules linked in: ebtable_nat ebtables ipt_MASQUERADE iptable_nat
nf_nat xt_CHECKSUM iptable_mangle autofs4 cpufreq_ondemand acpi_cpufreq
freq_table mperf bridge stp llc ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4
iptable_filter ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6
xt_state nf_conntrack ip6table_filter ip6_tables ipv6 ext3 jbd vhost_net
macvtap macvlan tun kvm_intel kvm ppdev parport_pc parport iTCO_wdt
iTCO_vendor_support microcode r8169 mii i2c_i801 sg lpc_ich mfd_core shpchp
ext4 jbd2 mbcache raid1 sd_mod crc_t10dif ahci xhci_hcd wmi i915
drm_kms_helper drm i2c_algo_bit i2c_core video output dm_mirror
dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
<4>
<4>Pid: 23490, comm: qemu-kvm Not tainted 2.6.32-431.11.2.el6.x86_64 #1 MSI
MS-7816/H87-G43 (MS-7816)
<4>RIP: 0010:[<ffffffff810657f3>]  [<ffffffff810657f3>]
load_balance_fair+0x2a3/0x300
<4>RSP: 0018:ffff8806c0045a98  EFLAGS: 00010046
<4>RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000002
<4>RDX: ffff8806c004d440 RSI: ffff88040e872200 RDI: ffff8806c004d400
<4>RBP: ffff8806c0045b58 R08: 0000000000000000 R09: 0000000000000001
<4>R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002
<4>R13: 0000000000000000 R14: 0000000000000002 R15: ffff8806c004d400
<4>FS:  00007f6215948700(0000) GS:ffff880028200000(0000)
knlGS:0000000000000000
<4>CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b
<4>CR2: 000000004d000001 CR3: 00000003ee2dd000 CR4: 00000000001427e0
<4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
<4>DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
<4>Process qemu-kvm (pid: 23490, threadinfo ffff8806c0044000, task
ffff8803ee039540)
<4>Stack:
<4> 0000000000000402 00000000000001fc ffff88038d4ca000 00000000000001fc
<4><d> ffff880028216840 00000000000001fc 0000000100000000 000000000000002a
<4><d> 0000000000000002 ffff880028316840 0000000000000000 ffff88002820fbe0
<4>Call Trace:
<4> [<ffffffff81528350>] thread_return+0x46e/0x76e
<4> [<ffffffffa0292db5>] kvm_vcpu_block+0x75/0xc0 [kvm]
<4> [<ffffffff8109b290>] ? autoremove_wake_function+0x0/0x40
<4> [<ffffffffa02a73d7>] kvm_arch_vcpu_ioctl_run+0x627/0x10b0 [kvm]
<4> [<ffffffffa028eb04>] kvm_vcpu_ioctl+0x434/0x580 [kvm]
<4> [<ffffffff81060b13>] ? perf_event_task_sched_out+0x33/0x70
<4> [<ffffffff8100bb8e>] ? apic_timer_interrupt+0xe/0x20
<4> [<ffffffff8119dc12>] vfs_ioctl+0x22/0xa0
<4> [<ffffffff8119e0da>] do_vfs_ioctl+0x3aa/0x580
<4> [<ffffffff8100bb8e>] ? apic_timer_interrupt+0xe/0x20
<4> [<ffffffffa029b6ab>] ? kvm_on_user_return+0x7b/0x90 [kvm]
<4> [<ffffffff8119e331>] sys_ioctl+0x81/0xa0
<4> [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
<4>Code: 8b 55 18 41 8b 45 20 3b 02 7d 02 89 02 4c 89 ff 4d 89 f4 e8 60 ee
ff ff 49 89 c5 4d 85 ed 0f 85 78 ff ff ff 0f 1f 40 00 4c 89 e1 <4c> 8b b4
58 ff ff ff 4c 8b a5 50 ff ff ff 4c 8b bd 48 ff ff ff
<1>RIP  [<ffffffff810657f3>] load_balance_fair+0x2a3/0x300
<4> RSP <ffff8806c0045a98>
<4>CR2: 000000004d000001
--

Any hints/tipps how to pin down the problem?

Thanks a lot,

Fabian