Few VMs (combination of 1 or 2 vCPUs) run on the host above. OS fully patched up to 06/07/2014. <br />
versions: <br />
qemu-kvm-0.12.1.2-2.415.el6_5.10.x86_64<br />
libvirt-0.10.2-29.el6_5.9.x86_64<br />
<br />
Randomly (every 2 or 3 hours), the host completely crash (no input from keyboard, only solution is power button), reporting the following in /var/log/messages:<br />
<br />
Jul 6 17:48:06 vhost kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000068<br />
Jul 6 17:48:06 vhost kernel: IP: [<ffffffff8152a529>] down_read+0x19/0x30<br />
Jul 6 17:48:06 vhost kernel: PGD 0 <br />
Jul 6 17:48:06 vhost kernel: Oops: 0002 [<a href="http://bugs.centos.org/view.php?id=1">0000001</a>] SMP <br />
Jul 6 17:48:06 vhost kernel: last sysfs file: /sys/devices/virtual/net/vnet24/address<br />
Jul 6 17:48:06 vhost kernel: CPU 1 <br />
Jul 6 17:48:06 vhost kernel: Modules linked in: iptable_nat nf_nat ip6table_filter ip6_tables ebtable_nat ebtables bridge nfs lockd fscache auth_rpcgss nfs_acl sunrpc 8021q garp stp llc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 ipt_REJECT xt_mac nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables sha256_generic cbc vhost_net macvtap macvlan tun kvm_intel kvm raid0 e1000e ptp pps_core iTCO_wdt iTCO_vendor_support tpm_infineon microcode serio_raw sg i2c_i801 lpc_ich mfd_core ioatdma dca snd_hda_codec_realtek<br />
Jul 6 17:48:06 vhost kernel: Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff81072d92<br />
Jul 6 17:48:06 vhost kernel: <br />
<br />
<br />
kernel:Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff81072d92<br />
<br />
<br />
kernel:<br />
Jul 6 17:48:06 vhost kernel: BUG: scheduling while atomic: qemu-kvm/4083/0x00000000<br />
Jul 6 17:48:06 vhost kernel: Modules linked in: iptable_nat nf_nat ip6table_filter ip6_tables ebtable_nat ebtables bridge nfs lockd fscache auth_rpcgss nfs_acl sunrpc 8021q garp stp llc cpufreq_ondemand acpi_cpufreq freq_table mperf ipv6 ipt_REJECT xt_mac nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack iptable_filter ip_tables sha256_generic cbc vhost_net macvtap macvlan tun kvm_intel kvm raid0 e1000e ptp pps_core iTCO_wdt iTCO_vendor_support tpm_infineon microcode serio_raw sg i2c_i801 lpc_ich mfd_core ioatdma dca snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm snd_timer snd soundcore snd_page_alloc i5000_edac edac_core i5k_amb shpchp ext4 jbd2 mbcache ablk_helper cryptd lrw glue_helper aes_x86_64 aes_generic xts gf128mul dm_crypt sd_mod crc_t10dif sr_mod cdrom firewire_ohci firewire_core crc_itu_t ahci pata_acpi ata_generic ata_piix nouveau ttm drm_kms_helper drm i2c_algo_bit i2c_core mxm_wmi video output wmi dm_mirror dm_region_hash dm_log dm_mod [last unloa<br />
Jul 6 17:48:06 vhost kernel: ded: scsi_wait_scan]<br />
Jul 6 17:48:06 vhost kernel: Pid: 4083, comm: qemu-kvm Not tainted 2.6.32-431.20.3.el6.x86_64 <a href="http://bugs.centos.org/view.php?id=1">0000001</a><br />
Jul 6 17:48:06 vhost kernel: Call Trace:<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff8105da66>] ? __schedule_bug+0x66/0x70<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff81528e30>] ? thread_return+0x640/0x760<br />
Jul 6 17:48:06 vhost kernel: [<ffffffffa046c0fb>] ? __vmx_load_host_state+0xab/0x100 [kvm_intel]<br />
Jul 6 17:48:06 vhost kernel: [<ffffffffa040f81b>] ? kvm_arch_vcpu_put+0x4b/0x60 [kvm]<br />
Jul 6 17:48:06 vhost kernel: [<ffffffffa0406db5>] ? kvm_vcpu_block+0x75/0xc0 [kvm]<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff8109afa0>] ? autoremove_wake_function+0x0/0x40<br />
Jul 6 17:48:06 vhost kernel: [<ffffffffa041b597>] ? kvm_arch_vcpu_ioctl_run+0x5b7/0x1090 [kvm]<br />
Jul 6 17:48:06 vhost kernel: [<ffffffffa0402b04>] ? kvm_vcpu_ioctl+0x434/0x580 [kvm]<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff8119e3c2>] ? vfs_ioctl+0x22/0xa0<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff8119e88a>] ? do_vfs_ioctl+0x3aa/0x580<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff8119eae1>] ? sys_ioctl+0x81/0xa0<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff810e1c7e>] ? __audit_syscall_exit+0x25e/0x290<br />
Jul 6 17:48:06 vhost kernel: [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b
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