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Re: [Xen-devel] Crashing DomU

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Crashing DomU
From: Killian De Volder <killian.de.volder@xxxxxxxxxx>
Date: Wed, 11 Nov 2009 09:08:57 +0100
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After removing some things from my .config (of witch PCI support) xen now seems to boot.
Good day,

I'm experiencing a crashing domU kernel (during bootup)
A person on IRC redirected me to the devel mailing list as it might well be a bug.

Below you can find the information about the crash, and versions used.
(Used .config for domU is attached.)

If you have any questions, feel free to ask.


Xen Hypervision Version: 3.4.1
DomU kernel: Vanilla-sources
DomO kernel: Linux xen 2.6.18-xen-r12
CPU: SMP x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 4400+

Xen config file:

kernel = "/boot/domU/net_vmlinuz"
memory = 128
name = "net"
vcpus = 2
vif = [ 'bridge=lan' ]
disk = [

root = "/dev/xvda1 ro"
extra="console=hvc0 earlyprintk=xen"

Crash report:
rip: ffffffff811f22b0 write_console+0x43
flags: 00001246 i z p
rsp: ffffffff8142dc60
rax: ffffffff81654000    rcx: 000000000000003d    rdx: 0000000000000008
rbx: ffffffff8147d360    rsi: ffffffff813e21be    rdi: 0000000000000000
rbp: 0000000000000008     r8: ffffffff815b5570     r9: ffffffff815358c5
r10: 0000000000000010    r11: ffffffff815b5930    r12: ffffffff813e21be
r13: 0000000000000008    r14: ffff880000000000    r15: 0000000000000000
cs: e033     ss: e02b     ds: 0000     es: 0000
fs: 0000 @ 0000000000000000
gs: 0000 @ ffffffff814a0000/0000000000000000
Code (instr addr ffffffff811f22b0)
00 48 83 f8 ff 75 25 80 3d 59 a3 2a 00 00 48 8b 05 a8 b0 33 00 <48> 8b 40 48 75 11 44 89 fa 48 b9

000000000000003d ffffffff815b5930 0000000000000000 ffffffff811f22b0
000000010000e030 0000000000010046 ffffffff8142dca8 000000000000e02b
ffffffff8117c89f 0000002100000008 ffffffff8147d360 000000000000003d
00000000000003a5 ffffffff8149be18 ffffffff815358c5 ffffffff8142dda8

Call Trace:
 [<ffffffff811f22b0>] write_console+0x43  <--
 [<ffffffff811f22b0>] write_console+0x43
 [<ffffffff8117c89f>] vsnprintf+0x7b3
 [<ffffffff811f245b>] xenboot_write_console+0x45
 [<ffffffff8104ec35>] __call_console_drivers+0x64
 [<ffffffff8104f04a>] release_console_sem+0x10e
 [<ffffffff8104f5bf>] vprintk+0x2e3
 [<ffffffff810269f3>] __raw_callee_save_xen_restore_fl+0x11
 [<ffffffff810269f3>] __raw_callee_save_xen_restore_fl+0x11
 [<ffffffff81026a11>] __raw_callee_save_xen_irq_disable+0x11
 [<ffffffff810269f3>] __raw_callee_save_xen_restore_fl+0x11
 [<ffffffff813095b8>] printk+0x4e
 [<ffffffff813095b8>] printk+0x4e
 [<ffffffff814c2f36>] mark_bootmem_node+0xa8
 [<ffffffff814b7135>] e820_register_active_regions+0x5a
 [<ffffffff814b71a4>] early_res_to_bootmem+0x56
 [<ffffffff814bf48b>] initmem_init+0x8c
 [<ffffffff814b60b4>] setup_arch+0x508
 [<ffffffff8130afe3>] _spin_unlock_irqrestore+0xc
 [<ffffffff810681fb>] clockevents_register_notifier+0x39
 [<ffffffff814b32ee>] start_kernel+0x7e

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