Re: [PATCH v2] kvm tools: Support multiple net devices

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On Mon, 26 Sep 2011, Asias He wrote:
$ ./kvm run -n mode=tap


[    1.490781] registered taskstats version 1
[    1.492781] BUG: unable to handle kernel NULL pointer dereference at
0000001c
[    1.493781] IP: [<c14f3236>] virtnet_poll+0x16e/0x408
[    1.493781] *pde = 00000000
[    1.493781] Oops: 0000 [#1] PREEMPT SMP
[    1.493781] Modules linked in:
[    1.493781]
[    1.493781] Pid: 1, comm: swapper Tainted: G        W   3.1.0-rc3+ #77
[    1.493781] EIP: 0060:[<c14f3236>] EFLAGS: 00010286 CPU: 1
[    1.493781] EIP is at virtnet_poll+0x16e/0x408
[    1.493781] EAX: 00001000 EBX: db4bb0c0 ECX: db7cd778 EDX: 00001000
[    1.493781] ESI: 00000000 EDI: db7cd6c0 EBP: db487fa8 ESP: db487f64
[    1.493781]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[    1.493781] Process swapper (pid: 1, ti=db486000 task=db450000
task.ti=db458000)
[    1.493781] Stack:
[    1.493781]  db487f98 19dfb000 db5e1400 00000080 c1b0df60 db6ff000
00000000 00000010
[    1.493781]  00000080 dbcebfe0 db5e1414 db5e1000 ffffffff fffec005
db5e1414 db906dc0
[    1.493781]  c1a39a0c db487fd4 c15e4869 fffb71f7 db906dc8 00000080
0000012c 00000000
[    1.493781] Call Trace:
[    1.493781]  [<c15e4869>] net_rx_action+0x8e/0x177
[    1.493781]  [<c1066128>] __do_softirq+0xa7/0x158
[    1.493781]  [<c1066081>] ? __tasklet_hi_schedule_first+0x2b/0x2b
[    1.493781]  <IRQ>
[    1.493781]  [<c1065e82>] ? _local_bh_enable_ip.isra.9+0x65/0x86
[    1.493781]  [<c1065eab>] ? local_bh_enable_ip+0x8/0xa
[    1.493781]  [<c16a7a78>] ? _raw_spin_unlock_bh+0x18/0x1a
[    1.493781]  [<c15e59c5>] ? dev_set_rx_mode+0x22/0x26
[    1.493781]  [<c15e5a5f>] ? __dev_open+0x96/0xa6
[    1.493781]  [<c15e5c23>] ? __dev_change_flags+0x97/0x10e
[    1.493781]  [<c15e5cfe>] ? dev_change_flags+0x13/0x3f
[    1.493781]  [<c1acfe6f>] ? ip_auto_config+0x160/0xcf8
[    1.493781]  [<c1393c86>] ? extract_entropy+0x45/0x71
[    1.493781]  [<c1059e35>] ? get_parent_ip+0xb/0x31
[    1.493781]  [<c16aa6b7>] ? sub_preempt_count+0x7c/0x89
[    1.493781]  [<c16a7d24>] ? _raw_spin_unlock+0x1c/0x27
[    1.493781]  [<c1629173>] ? tcp_set_default_congestion_control+0x8c/0x95
[    1.493781]  [<c1001159>] ? do_one_initcall+0x71/0x114
[    1.493781]  [<c1acfd0f>] ? root_nfs_parse_addr+0x91/0x91
[    1.493781]  [<c1a9c7ab>] ? kernel_init+0xab/0x11d
[    1.493781]  [<c1a9c700>] ? start_kernel+0x301/0x301
[    1.493781]  [<c16acfb6>] ? kernel_thread_helper+0x6/0xd
[    1.493781] Code: 89 d8 e8 23 94 0e 00 8b 4d dc 89 c7 f3 a4 8b 55 dc
8b 4d d8 29 55 f0 8b 75 e0 01 d1 eb 13 8d 45 f0 89 f2 50 89 d8 e8 ae f2
ff ff <8b> 76 1c 31 c9 58 83 7d f0 00 75 e7 85 f6 89 75 e0 0f 84 6e 02
[    1.493781] EIP: [<c14f3236>] virtnet_poll+0x16e/0x408 SS:ESP
0068:db487f64
[    1.493781] CR2: 000000000000001c
[    1.549772] ---[ end trace 4eaa2a86a8e2da27 ]---
[    1.550772] Kernel panic - not syncing: Fatal exception in interrupt
[    1.551772] Pid: 1, comm: swapper Tainted: G      D W   3.1.0-rc3+ #77
[    1.553771] Call Trace:
[    1.553771]  [<c169ca33>] panic+0x58/0x156
[    1.554771]  [<c16a921a>] oops_end+0x8c/0x9b
[    1.555771]  [<c169c4e7>] no_context+0x116/0x120
[    1.555771]  [<c169c5e1>] __bad_area_nosemaphore+0xf0/0xf8
[    1.557771]  [<c169c5f6>] bad_area_nosemaphore+0xd/0x10
[    1.558771]  [<c16aa4b5>] do_page_fault+0x174/0x2fa
[    1.559770]  [<c107bad0>] ? sched_clock_local+0x10/0x14b
[    1.560770]  [<c15db33f>] ? __netdev_alloc_skb+0x17/0x34
[    1.561770]  [<c10e9b84>] ? __kmalloc_track_caller+0xb7/0xc7
[    1.563770]  [<c15db33f>] ? __netdev_alloc_skb+0x17/0x34
[    1.564770]  [<c16aa341>] ? spurious_fault+0xa8/0xa8
[    1.565770]  [<c16a89d6>] error_code+0x5a/0x60
[    1.566769]  [<c16aa341>] ? spurious_fault+0xa8/0xa8
[    1.567769]  [<c14f3236>] ? virtnet_poll+0x16e/0x408
[    1.567769]  [<c15e4869>] net_rx_action+0x8e/0x177
[    1.568769]  [<c1066128>] __do_softirq+0xa7/0x158
[    1.569769]  [<c1066081>] ? __tasklet_hi_schedule_first+0x2b/0x2b
[    1.569769]  <IRQ>  [<c1065e82>] ? _local_bh_enable_ip.isra.9+0x65/0x86
[    1.570769]  [<c1065eab>] ? local_bh_enable_ip+0x8/0xa
[    1.571769]  [<c16a7a78>] ? _raw_spin_unlock_bh+0x18/0x1a
[    1.571769]  [<c15e59c5>] ? dev_set_rx_mode+0x22/0x26
[    1.572768]  [<c15e5a5f>] ? __dev_open+0x96/0xa6
[    1.573768]  [<c15e5c23>] ? __dev_change_flags+0x97/0x10e
[    1.573768]  [<c15e5cfe>] ? dev_change_flags+0x13/0x3f
[    1.574768]  [<c1acfe6f>] ? ip_auto_config+0x160/0xcf8
[    1.574768]  [<c1393c86>] ? extract_entropy+0x45/0x71
[    1.575768]  [<c1059e35>] ? get_parent_ip+0xb/0x31
[    1.576768]  [<c16aa6b7>] ? sub_preempt_count+0x7c/0x89
[    1.576768]  [<c16a7d24>] ? _raw_spin_unlock+0x1c/0x27
[    1.577768]  [<c1629173>] ? tcp_set_default_congestion_control+0x8c/0x95
[    1.578768]  [<c1001159>] ? do_one_initcall+0x71/0x114
[    1.578768]  [<c1acfd0f>] ? root_nfs_parse_addr+0x91/0x91
[    1.579767]  [<c1a9c7ab>] ? kernel_init+0xab/0x11d
[    1.580767]  [<c1a9c700>] ? start_kernel+0x301/0x301
[    1.581767]  [<c16acfb6>] ? kernel_thread_helper+0x6/0xd
[    1.582767] Rebooting in 1 seconds..
 # KVM session ended normally.

This needs fixing before I can apply the patch, right?
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