[Xen-users] Please help, I get a kernel panic on all DomUs when setting vif in VM config file

[Pierre CHAUSSEE <silversens@xxxxxxxxx>]

I just don't get it.
I've been using Xen for quite a long time, never had any trouble on x86, so I'm trying to move on an x86_64 platform.

Everything went well (building, booting on Dom0, ...) except that I can only start my VMs when vif parameter is not filled !
When I remove the comment on my "vif  = [ 'type=ioemu, bridge=xenbr0' ]" then I get a kernel panic.

Here's my VM config : 
kernel = "/usr/lib/xen/boot/hvmloader"

builder='hvm'

name="test"
boot='c'
vnc = 1
sdl = 0
memory = 1024   # Memory size  
swap   = 128    # Swap size  
disk = [ 'phy:vg00/win2008_x64,ioemu:hda,w' ]

vif = [ 'type=ioemu, bridge=xenbr0' ]
keyboard='fr'

And here's the kernel panic output : 

$ xm create /etc/xen/first_vm

[  123.729203] BUG: unable to handle kernel NULL pointer dereference at
0000000000000008
[  123.729569] IP: [<ffffffff81321416>] netback_uevent+0x1e/0xb6
[  123.729771] PGD 72afb067 PUD 72aa3067 PMD 0 
[  123.730003] Oops: 0000 [#1] SMP 

[  123.730003] last sysfs file: /sys/devices/vif-1-0/uevent
[  123.730003] CPU 0 
[  123.730003] Modules linked in:
[  123.730003] Pid: 934, comm: udevd Not tainted 2.6.32.12 #2         
[  123.730003] RIP: e030:[<ffffffff81321416>]  [<ffffffff81321416>]

netback_uevent+0x1e/0xb6
[  123.730003] RSP: e02b:ffff880072b25da8  EFLAGS: 00010246
[  123.730003] RAX: 0000000000000000 RBX: ffff880072ae1800 RCX:
0000000000000000
[  123.730003] RDX: 0000000000000037 RSI: ffff8800720cc000 RDI:

0000000000000000
[  123.730003] RBP: ffff880072b25dc8 R08: 0000000000000002 R09:
0000000000000073
[  123.730003] R10: 00000000000006a5 R11: 000000000002d1af R12:
ffff8800720cc000
[  123.730003] R13: ffff880072ae1800 R14: ffffffff8192c9f8 R15:

ffff880034b85000
[  123.730003] FS:  00007f2cea4126f0(0000) GS:ffff880001fa1000(0000)
knlGS:0000000000000000
[  123.730003] CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
[  123.730003] CR2: 0000000000000008 CR3: 0000000072b03000 CR4:

0000000000002660
[  123.730003] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[  123.730003] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[  123.730003] Process udevd (pid: 934, threadinfo ffff880072b24000, task

ffff88007283adc0)
[  123.730003] Stack:
[  123.730003]  ffff880072ae1840 ffff8800720cc000 ffff880072ae1800
ffffffff8192c9f8
[  123.730003] <0> ffff880072b25df8 ffffffff81312e2c ffff880072ae1840
ffff8800720cc000

[  123.730003] <0> ffff88007401d480 ffff880072ae1850 ffff880072b25e28
ffffffff8138ce3b
[  123.730003] Call Trace:
[  123.730003]  [<ffffffff81312e2c>] xenbus_uevent_backend+0x90/0xab
[  123.730003]  [<ffffffff8138ce3b>] dev_uevent+0x102/0x146

[  123.730003]  [<ffffffff8138db22>] show_uevent+0x81/0xd7
[  123.730003]  [<ffffffff8138cafd>] dev_attr_show+0x22/0x49
[  123.730003]  [<ffffffff810ba1b2>] ? __get_free_pages+0x9/0x46
[  123.730003]  [<ffffffff8113df56>] sysfs_read_file+0xac/0x12e

[  123.730003]  [<ffffffff810ed94a>] vfs_read+0xa6/0x103
[  123.730003]  [<ffffffff810eda5d>] sys_read+0x45/0x69
[  123.730003]  [<ffffffff81011a82>] system_call_fastpath+0x16/0x1b
[  123.730003] Code: 00 00 0f 86 78 fe ff ff e9 e4 fb ff ff 55 48 89 e5 41 56

41 55 41 54 49 89 f4 53 48 89 fb 48 8d 7f 40 e8 84 e0 06 00 31 c9 31 ff <4c> 8b
68 08 48 8b 73 08 48 c7 c2 d6 1c 84 81 e8 e9 05 ff ff 49 
[  123.730003] RIP  [<ffffffff81321416>] netback_uevent+0x1e/0xb6

[  123.730003]  RSP <ffff880072b25da8>
[  123.730003] CR2: 0000000000000008
[  123.730003] ---[ end trace e62360ceb21167c0 ]---

Please help ! I've been trying this for days...
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