[ovs-dev] Kernel BUG on Xen

[Nick Couchman]

> 
> 
> Can you try applying this patch to see if it makes a difference?
> 

Still crashes:

[  163.329169] ------------[ cut here ]------------
[  163.329181] kernel BUG at /usr/src/packages/BUILD/kernel-xen-2.6.31.12/linux-2.6.31/net/core/skbuff.c:1204!
[  163.329185] invalid opcode: 0000 [#1] SMP 
[  163.329190] last sysfs file: /sys/devices/xen-backend/vbd-1-768/statistics/wr_sect
[  163.329194] CPU 0 
[  163.329196] Modules linked in: tun gntdev netbk blkbk blkback_pagemap blktap autofs4 edd ipv6 af_packet microcode brcompat_mod openvswitch_mod fuse loop dm_mod intel_agp iTCO_wdn
[  163.329255] Pid: 0, comm: swapper Tainted: G         C 2.6.31.12-0.2-xen #1 OptiPlex 755                 
[  163.329258] RIP: e030:[<ffffffff803b8c9d>]  [<ffffffff803b8c9d>] __pskb_pull_tail+0x6d/0x380
[  163.329268] RSP: e02b:ffffc90000003b10  EFLAGS: 00010282
[  163.329271] RAX: 00000000fffffff2 RBX: ffff880072353180 RCX: 00000000ffffffec
[  163.329298] RDX: 0000000000000000 RSI: 0000000000000080 RDI: ffff880072353180
[  163.329302] RBP: ffffc90000003b60 R08: ffff8800727b6848 R09: 0000000000000024
[  163.329305] R10: 00007f028661aeb0 R11: 0000000000000000 R12: 00000000ffffffec
[  163.329308] R13: ffff8800727b6820 R14: 0000000000000009 R15: 0000000000000000
[  163.329317] FS:  00007f0286a286f0(0000) GS:ffffc90000000000(0000) knlGS:0000000000000000
[  163.329321] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  163.329324] CR2: 0000000000696008 CR3: 0000000071868000 CR4: 0000000000002660
[  163.329328] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  163.329331] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[  163.329335] Process swapper (pid: 0, threadinfo ffffffff80736000, task ffffffff807390a0)
[  163.329338] Stack:
[  163.329340]  ffff8800716073c0 ffff8800722bc000 ffffffff80785680 4e8c71394028ec21
[  163.329346] <0> ffffc90000003b70 ffff880072353180 ffff8800727b6800 ffff8800727b6820
[  163.329352] <0> 0000000000000009 0000000000000000 ffffc90000003ba0 ffffffffa0213f97
[  163.329359] Call Trace:
[  163.329377]  [<ffffffffa0213f97>] vswitch_skb_checksum_setup+0xb7/0x1b0 [openvswitch_mod]
[  163.329392]  [<ffffffffa0214162>] dp_output_control+0xd2/0x2f0 [openvswitch_mod]
[  163.329403]  [<ffffffffa02144df>] dp_process_received_packet+0x15f/0x1c0 [openvswitch_mod]
[  163.329414]  [<ffffffffa0218df8>] vport_receive+0x38/0xc0 [openvswitch_mod]
[  163.329431]  [<ffffffffa021d83f>] netdev_frame_hook+0x7f/0xb0 [openvswitch_mod]
[  163.329448]  [<ffffffff803c55b2>] netif_receive_skb+0x202/0x590
[  163.329455]  [<ffffffff803c59e1>] process_backlog+0xa1/0x140
[  163.329461]  [<ffffffff803c63dc>] net_rx_action+0x14c/0x2e0
[  163.329468]  [<ffffffff80057e03>] __do_softirq+0xe3/0x240
[  163.329475]  [<ffffffff8000d48c>] call_softirq+0x1c/0x30
[  163.329481]  [<ffffffff8000ec05>] do_softirq+0xb5/0x100
[  163.329487]  [<ffffffff80057625>] irq_exit+0x65/0x80
[  163.329493]  [<ffffffff802fc12c>] evtchn_do_upcall+0x20c/0x250
[  163.329500]  [<ffffffff8000ceee>] do_hypervisor_callback+0x1e/0x30
[  163.329506]  [<ffffffff800083aa>] 0xffffffff800083aa
[  163.329516]  [<ffffffff8000f9a8>] xen_safe_halt+0x28/0x50
[  163.329522]  [<ffffffff80014999>] xen_idle+0x59/0x120
[  163.329527]  [<ffffffff8000b09b>] cpu_idle+0xbb/0x100
[  163.329533]  [<ffffffff8045b415>] rest_init+0x75/0x90
[  163.329540]  [<ffffffff80793c6b>] start_kernel+0x36d/0x38a
[  163.329547]  [<ffffffff80792d94>] x86_64_start_reservations+0xf4/0x10f
[  163.329553]  [<ffffffff80792dfa>] x86_64_start_kernel+0x4b/0x66
[  163.329556] Code: 47 7c 02 0f 85 40 02 00 00 48 8b 87 e0 00 00 00 8b 73 68 2b 73 6c 89 ca 48 8d 14 10 44 89 e1 48 89 df e8 d7 fc ff ff 85 c0 74 04 <0f> 0b eb fe 8b b3 d8 00 00 0 
[  163.329603] RIP  [<ffffffff803b8c9d>] __pskb_pull_tail+0x6d/0x380
[  163.329608]  RSP <ffffc90000003b10>
[  163.329625] ---[ end trace dd26c9040f54a274 ]---
[  163.329628] Kernel panic - not syncing: Fatal exception in interrupt
[  163.329632] Pid: 0, comm: swapper Tainted: G      D  C 2.6.31.12-0.2-xen #1
[  163.329635] Call Trace:
[  163.329640]  [<ffffffff800119b9>] try_stack_unwind+0x189/0x1b0
[  163.329646]  [<ffffffff8000f466>] dump_trace+0xa6/0x1e0
[  163.329652]  [<ffffffff800114c4>] show_trace_log_lvl+0x64/0x90
[  163.329657]  [<ffffffff80011513>] show_trace+0x23/0x40
[  163.329663]  [<ffffffff8046b92c>] dump_stack+0x81/0x9e
[  163.329667]  [<ffffffff8046b9cb>] panic+0x82/0x16e
[  163.329673]  [<ffffffff80470b71>] oops_end+0x151/0x160
[  163.329678]  [<ffffffff800113d2>] die+0x62/0xa0
[  163.329683]  [<ffffffff80470124>] do_trap+0xe4/0x190
[  163.329689]  [<ffffffff8000e242>] do_invalid_op+0xc2/0xf0
[  163.329694]  [<ffffffff8000d115>] invalid_op+0x25/0x30
[  163.329700]  [<ffffffff803b8c9d>] __pskb_pull_tail+0x6d/0x380
[  163.329709]  [<ffffffffa0213f97>] vswitch_skb_checksum_setup+0xb7/0x1b0 [openvswitch_mod]
[  163.329719]  [<ffffffffa0214162>] dp_output_control+0xd2/0x2f0 [openvswitch_mod]
[  163.329729]  [<ffffffffa02144df>] dp_process_received_packet+0x15f/0x1c0 [openvswitch_mod]
[  163.329740]  [<ffffffffa0218df8>] vport_receive+0x38/0xc0 [openvswitch_mod]
[  163.329756]  [<ffffffffa021d83f>] netdev_frame_hook+0x7f/0xb0 [openvswitch_mod]
[  163.329773]  [<ffffffff803c55b2>] netif_receive_skb+0x202/0x590
[  163.329779]  [<ffffffff803c59e1>] process_backlog+0xa1/0x140
[  163.329784]  [<ffffffff803c63dc>] net_rx_action+0x14c/0x2e0
[  163.329790]  [<ffffffff80057e03>] __do_softirq+0xe3/0x240
[  163.329795]  [<ffffffff8000d48c>] call_softirq+0x1c/0x30
[  163.329800]  [<ffffffff8000ec05>] do_softirq+0xb5/0x100
[  163.329805]  [<ffffffff80057625>] irq_exit+0x65/0x80
[  163.329810]  [<ffffffff802fc12c>] evtchn_do_upcall+0x20c/0x250
[  163.329816]  [<ffffffff8000ceee>] do_hypervisor_callback+0x1e/0x30
[  163.329825]  [<ffffffff800083aa>] 0xffffffff800083aa
[  163.329834]  [<ffffffff8000f9a8>] xen_safe_halt+0x28/0x50
[  163.329840]  [<ffffffff80014999>] xen_idle+0x59/0x120
[  163.329844]  [<ffffffff8000b09b>] cpu_idle+0xbb/0x100
[  163.329849]  [<ffffffff8045b415>] rest_init+0x75/0x90
[  163.329854]  [<ffffffff80793c6b>] start_kernel+0x36d/0x38a
[  163.329860]  [<ffffffff80792d94>] x86_64_start_reservations+0xf4/0x10f
[  163.329865]  [<ffffffff80792dfa>] x86_64_start_kernel+0x4b/0x66



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