[Xen-bugs] Re: [x86_64] Kernel panic when creating first VM (same behavior on 2.6.27, 2.6.32, ...)

[Pierre CHAUSSEE <silversens@xxxxxxxxx>]

Er...

It's kind of weird, maybe it's linked to my network configuration, because if, 
in my VM, I comment the 
vif = [ 'type=ioemu, mac=aa:aa:b0:00:00:01, bridge=xenbr0' ]
there's no more kernel panic.

Any ideas ?

> Hi,
> 
> I've been using Xen on different x86 platforms without any troubles.
> I'm trying it for the first time on a pure x86_64 system.
> 
> Everything went well for xen compilation, same for compiling dom0 kernel, and 
> booting on it.
> But when I tryed to start my first VM, a kernel panic appeared, I've been 
> trying upgrading to a newer dom0 kernel and the 4.0 release of xen, nothing 
> helped, still the same behavior.
> 
> Here's what I get (and see attached my dom0 .config file for kernel 2.6.32) :
> 
> $ xm create /etc/xen/first_vm
> 
> [  123.670637]   alloc irq_desc for 745 on node 0
> [  123.670641]   alloc kstat_irqs on node 0
> [  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 ]---
> 
> 
> Any idea ?
> 
> 
> <config>


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