Bug 858893

I get the following crash if I try to install Fedora 18 Alpha as a DomU guest with a network interface (this is on an Fedora 17 dom0 running xen 4.2)

[   19.364922] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[   19.365066] IP: [<ffffffffa013085e>] xennet_poll+0x94e/0xf10 [xen_netfront]
[   19.365066] PGD 2b64a067 PUD 2b64b067 PMD 0 
[   19.365066] Oops: 0000 [#1] SMP 
[   19.365066] Modules linked in: microcode(+) nls_utf8 xen_netfront xen_blkfront sunrpc xts lrw gf128mul dm_crypt dm_round_robin dm_multipath linear raid10 raid456 async_raid6_recov async_memcpy async_pq raid6_pq async_xor xor async_tx raid1 raid0 scsi_dh_rdac scsi_dh_hp_sw scsi_dh_emc scsi_dh_alua squashfs cramfs
[   19.365066] CPU 0 
[   19.365066] Pid: 489, comm: NetworkManager Not tainted 3.6.0-0.rc2.git2.1.fc18.x86_64 #1  
[   19.365066] RIP: e030:[<ffffffffa013085e>]  [<ffffffffa013085e>] xennet_poll+0x94e/0xf10 [xen_netfront]
[   19.365066] RSP: e02b:ffff88003fc03cd8  EFLAGS: 00010282
[   19.365066] RAX: ffff880034ec9140 RBX: 0000000000000001 RCX: 0000000000000000
[   19.365066] RDX: 000000000000009a RSI: 000000000000005a RDI: ffff88003d4e7b00
[   19.365066] RBP: ffff88003fc03eb8 R08: 0000000000000000 R09: ffff880034ec9000
[   19.365066] R10: 0000000000000200 R11: 0000000000000000 R12: ffff8800348a0b00
[   19.365066] R13: ffff88003d4e7b00 R14: ffff88003d4e7b00 R15: ffff88003fc03d50
[   19.365066] FS:  00007f8f26a4b840(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
[   19.365066] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[   19.365066] CR2: 0000000000000010 CR3: 000000002b67e000 CR4: 0000000000002660
[   19.365066] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   19.365066] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[   19.365066] Process NetworkManager (pid: 489, threadinfo ffff88002b750000, task ffff88002b748000)
[   19.365066] Stack:
[   19.365066]  00000004823e7340 ffff8800348a1840 000000403fc03d08 ffff8800348a0000
[   19.365066]  000000000000000a ffff8800348a04a8 ffff8800348a0b18 ffff8800348a2190
[   19.365066]  0000000000000012 ffff88000000000a ffffffff0000005a ffff88003fc03dc0
[   19.365066] Call Trace:
[   19.365066]  <IRQ> 
[   19.365066]  [<ffffffff8104bd81>] ? pvclock_clocksource_read+0x61/0xf0
[   19.365066]  [<ffffffff810102e9>] ? xen_clocksource_read+0x39/0x50
[   19.365066]  [<ffffffff8159a7b2>] net_rx_action+0x172/0x340
[   19.365066]  [<ffffffff81071e77>] ? __do_softirq+0x167/0x3d0
[   19.365066]  [<ffffffff81071e00>] __do_softirq+0xf0/0x3d0
[   19.365066]  [<ffffffff816e7d7c>] call_softirq+0x1c/0x30
[   19.365066]  <EOI> 
[   19.365066]  [<ffffffff8101c365>] do_softirq+0xa5/0xe0
[   19.365066]  [<ffffffffa0130e79>] ? xennet_open+0x59/0xe0 [xen_netfront]
[   19.365066]  [<ffffffff81071d05>] local_bh_enable_ip+0xf5/0x100
[   19.365066]  [<ffffffff816dda74>] _raw_spin_unlock_bh+0x44/0x50
[   19.365066]  [<ffffffffa0130e79>] xennet_open+0x59/0xe0 [xen_netfront]
[   19.365066]  [<ffffffff8159c8ff>] __dev_open+0x8f/0xf0
[   19.365066]  [<ffffffff8159cbc1>] __dev_change_flags+0xa1/0x180
[   19.365066]  [<ffffffff8159cd58>] dev_change_flags+0x28/0x70
[   19.365066]  [<ffffffff815aaca8>] do_setlink+0x378/0xa00
[   19.365066]  [<ffffffff816ddb7b>] ? _raw_spin_unlock+0x2b/0x50
[   19.365066]  [<ffffffff81365dd1>] ? nla_parse+0x31/0xe0
[   19.365066]  [<ffffffff815ad3de>] rtnl_newlink+0x37e/0x560
[   19.365066]  [<ffffffff812e1119>] ? selinux_capable+0x39/0x50
[   19.365066]  [<ffffffff812dd6c8>] ? security_capable+0x18/0x20
[   19.365066]  [<ffffffff815acc04>] rtnetlink_rcv_msg+0x114/0x2f0
[   19.365066]  [<ffffffff815a9a77>] ? rtnl_lock+0x17/0x20
[   19.365066]  [<ffffffff815a9a77>] ? rtnl_lock+0x17/0x20
[   19.365066]  [<ffffffff810d61c1>] ? lock_release+0xc1/0x310
[   19.365066]  [<ffffffff815acaf0>] ? __rtnl_unlock+0x20/0x20
[   19.365066]  [<ffffffff815c8f91>] netlink_rcv_skb+0xa1/0xb0
[   19.365066]  [<ffffffff815a9aa5>] rtnetlink_rcv+0x25/0x40
[   19.365066]  [<ffffffff815c889d>] netlink_unicast+0x19d/0x220
[   19.365066]  [<ffffffff815c8c5d>] netlink_sendmsg+0x33d/0x3e0
[   19.365066]  [<ffffffff815824c8>] ? sock_update_classid+0x148/0x2e0
[   19.365066]  [<ffffffff8157d11c>] sock_sendmsg+0xbc/0xf0
[   19.365066]  [<ffffffff8157d647>] ? sock_recvmsg+0xd7/0x110
[   19.365066]  [<ffffffff8157d4fc>] __sys_sendmsg+0x3ac/0x3c0
[   19.365066]  [<ffffffff810d64cf>] ? lock_acquire+0xbf/0x1f0
[   19.365066]  [<ffffffff811d18bc>] ? fget_light+0x3c/0x520
[   19.365066]  [<ffffffff810d61c1>] ? lock_release+0xc1/0x310
[   19.365066]  [<ffffffff811d1979>] ? fget_light+0xf9/0x520
[   19.365066]  [<ffffffff811d18bc>] ? fget_light+0x3c/0x520
[   19.365066]  [<ffffffff8157fb29>] sys_sendmsg+0x49/0x90
[   19.365066]  [<ffffffff816e6aa9>] system_call_fastpath+0x16/0x1b
[   19.365066] Code: 01 4c 89 f7 41 8b 46 68 48 01 43 10 e8 dc 8e 46 e1 e9 37 fd ff ff 0f 1f 80 00 00 00 00 41 8b 85 d0 00 00 00 49 03 85 d8 00 00 00 <80> 3c 25 10 00 00 00 00 74 0f 48 83 3c 25 08 00 00 00 00 0f 84 
[   19.365066] RIP  [<ffffffffa013085e>] xennet_poll+0x94e/0xf10 [xen_netfront]
[   19.365066]  RSP <ffff88003fc03cd8>
[   19.365066] CR2: 0000000000000010
[   19.410530] ---[ end trace 3ca49fad96f07aa3 ]---
[   19.410990] Kernel panic - not syncing: Fatal exception in interrupt