Running the latest CentOS 6.5 64bit Xen kernel, I've got this stack trace. After this all the running domUs on this node lost their network and the node had to be rebooted.<br />
[...]<br />
Jul 16 14:50:48 xenlocal1 kernel: br0: port 15(vif31.1) entered disabled state<br />
Jul 16 14:50:48 xenlocal1 kernel: BUG: unable to handle kernel paging request at ffffc90010abe0d0<br />
Jul 16 14:50:48 xenlocal1 kernel: IP: [<ffffffffa02bb899>] netbk_gop_skb+0xb9/0x290 [xen_netback]<br />
Jul 16 14:50:48 xenlocal1 kernel: PGD 388c8067 PUD 388c9067 PMD 34b2c067 PTE 0<br />
Jul 16 14:50:48 xenlocal1 kernel: Oops: 0000 [<a href="http://bugs.centos.org/view.php?id=1">0000001</a>] SMP <br />
Jul 16 14:50:48 xenlocal1 kernel: Modules linked in: ext3 jbd xen_pciback xen_gntalloc ipmi_devintf ipmi_si ipmi_msghandler bridge stp llc bonding ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_connt<br />
rack ip6table_filter ip6_tables be2iscsi iscsi_boot_sysfs bnx2i cnic uio cxgb4i cxgb4 cxgb3i libcxgbi cxgb3 ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_tr<br />
ansport_iscsi blktap xen_netback xen_blkback xen_gntdev xen_evtchn xenfs xen_privcmd gpio_ich iTCO_wdt iTCO_vendor_support dcdbas coretemp freq_table mperf crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_i<br />
ntel ablk_helper cryptd lrw gf128mul glue_helper aes_x86_64 microcode pcspkr ses enclosure sg joydev lpc_ich shpchp igb acpi_power_meter ixgbe hwmon dca ptp pps_core mdio ext4 jbd2 mbcache sd_mod crc_t10dif sr_mod cdrom megaraid_sas ahci libahci wmi ttm drm_kms_helper dm_mirror dm_region_hash dm_log dm_mod<br />
Jul 16 14:50:48 xenlocal1 kernel: CPU: 0 PID: 823 Comm: netback/0 Not tainted 3.10.43-11.el6.centos.alt.x86_64 <a href="http://bugs.centos.org/view.php?id=1">0000001</a><br />
Jul 16 14:50:48 xenlocal1 kernel: Hardware name: Dell Inc. PowerEdge R620/01W23F, BIOS 2.2.2 01/16/2014<br />
Jul 16 14:50:48 xenlocal1 kernel: task: ffff880005691540 ti: ffff880035b76000 task.ti: ffff880035b76000<br />
Jul 16 14:50:48 xenlocal1 kernel: RIP: e030:[<ffffffffa02bb899>] [<ffffffffa02bb899>] netbk_gop_skb+0xb9/0x290 [xen_netback]<br />
Jul 16 14:50:48 xenlocal1 kernel: RSP: e02b:ffff880035b77cd8 EFLAGS: 00010202<br />
Jul 16 14:50:48 xenlocal1 kernel: RAX: ffffc9001041aac0 RBX: ffff880011ac20c0 RCX: ffffc90010abe000<br />
Jul 16 14:50:48 xenlocal1 kernel: RDX: 000000000000001a RSI: 0000000000000000 RDI: ffff880023886b80<br />
Jul 16 14:50:48 xenlocal1 kernel: RBP: ffff880035b77d48 R08: 0000000000000000 R09: 0000000000000000<br />
Jul 16 14:50:48 xenlocal1 kernel: R10: 0000000000007ff0 R11: 0000000000000002 R12: 0000000000000000<br />
Jul 16 14:50:48 xenlocal1 kernel: R13: 0000000000000000 R14: ffff880035b77d98 R15: ffff880011bc7800<br />
Jul 16 14:50:48 xenlocal1 kernel: FS: 00007f62b3a1f700(0000) GS:ffff88003f400000(0000) knlGS:0000000000000000<br />
Jul 16 14:50:48 xenlocal1 kernel: CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033<br />
Jul 16 14:50:48 xenlocal1 kernel: CR2: ffffc90010abe0d0 CR3: 0000000037046000 CR4: 0000000000042660<br />
Jul 16 14:50:48 xenlocal1 kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br />
Jul 16 14:50:48 xenlocal1 kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400<br />
Jul 16 14:50:48 xenlocal1 kernel: Stack:<br />
Jul 16 14:50:48 xenlocal1 kernel: ffff880038b00040 ffff880005691bd0 0000000000000000 ffff88003f411880<br />
Jul 16 14:50:48 xenlocal1 kernel: ffff880035b77d18 000000008100392e 0000000000000000 00000001815f7ec7<br />
Jul 16 14:50:48 xenlocal1 kernel: ffff880035b77d48 ffff880011ac20c0 0000000000000000 0000000000000000<br />
Jul 16 14:50:48 xenlocal1 kernel: Call Trace:<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffffa02bbb55>] xen_netbk_rx_action+0xe5/0x600 [xen_netback]<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff813572a0>] ? process_msg+0x290/0x290<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff815f7ec7>] ? _raw_spin_unlock_irqrestore+0x17/0x20<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffffa02bddf0>] xen_netbk_kthread+0x80/0x1b0 [xen_netback]<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff81082800>] ? wake_up_bit+0x40/0x40<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffffa02bdd70>] ? xen_netbk_tx_build_gops+0x8b0/0x8b0 [xen_netback]<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff81081fee>] kthread+0xce/0xe0<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff8100392e>] ? xen_end_context_switch+0x1e/0x30<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff81081f20>] ? kthread_freezable_should_stop+0x70/0x70<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff81600e2c>] ret_from_fork+0x7c/0xb0<br />
Jul 16 14:50:48 xenlocal1 kernel: [<ffffffff81081f20>] ? kthread_freezable_should_stop+0x70/0x70<br />
Jul 16 14:50:48 xenlocal1 kernel: Code: 47 60 04 0f 85 89 01 00 00 8b b3 d0 00 00 00 48 8b bb d8 00 00 00 0f b7 74 37 02 89 70 08 89 d2 c7 40 04 00 00 00 00 48 83 c2 08 <0f> b7 34 d1 89 30 41 c7 46 20 00 00 00 00 8b 44 d1 04 41 89 46 <br />
Jul 16 14:50:48 xenlocal1 kernel: RIP [<ffffffffa02bb899>] netbk_gop_skb+0xb9/0x290 [xen_netback]<br />
Jul 16 14:50:48 xenlocal1 kernel: RSP <ffff880035b77cd8><br />
Jul 16 14:50:48 xenlocal1 kernel: CR2: ffffc90010abe0d0<br />
Jul 16 14:50:48 xenlocal1 kernel: ---[ end trace b7a22eb1f1f1e4df ]---<br />
[...]
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