64 bit xen kernel panics with RIP [<ffffffff803433bd>] pci_create_bus+0x59/0x1f3

Issue

64 bit Xen kernel panics on boot with the below trace on the console.

kernel direct mapping tables up to 30800000 @ 125e000-156a000 
Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:  
 [<ffffffff803433bd>] pci_create_bus+0x59/0x1f3 
PGD 0  
Oops: 0000 [1] SMP  
last sysfs file:  
CPU 0  
Modules linked in: 
Pid: 1, comm: swapper Not tainted 2.6.18-128.el5xen #1 
RIP: e030:[<ffffffff803433bd>]  [<ffffffff803433bd>] pci_create_bus+0x59/0x1f3 
RSP: e02b:ffff880006141d50  EFLAGS: 00010286 
RAX: ffff88002ff8a000 RBX: ffff88002ff93200 RCX: 0000000000000000 
RDX: ffffffffff578000 RSI: 0000000000000005 RDI: 0000000000000000 
RBP: 0000000000000000 R08: ffff88002ff93400 R09: 0000000000000000 
R10: ffff880006141da0 R11: 0000000000000100 R12: ffff88002ff8a000 
R13: 0000000000000005 R14: ffffffff80543a70 R15: 0000000000000000 
FS:  0000000000000000(0000) GS:ffffffff805ba000(0000) knlGS:0000000000000000 
CS:  e033 DS: 0000 ES: 0000 
Process swapper (pid: 1, threadinfo ffff880006140000, task ffff8800000297a0) 
Stack:  0000000000000005  0000000000000005  0000000000000004  0000000000000000  
 0000000000000000  0000000000000000  0000000000000000  ffffffff8034428d  
 0000000000000005  ffffffff8065031d  
Call Trace: 
 [<ffffffff8034428d>] pci_scan_bus_parented+0x6/0x21 
 [<ffffffff8065031d>] pcibios_irq_init+0x177/0x491 
 [<ffffffff806347e5>] init+0x1f9/0x2fe 
 [<ffffffff8025fb2c>] child_rip+0xa/0x12 
 [<ffffffff806345ec>] init+0x0/0x2fe 
 [<ffffffff8025fb22>] child_rip+0x0/0x12 


Code: 8b 7d 00 e8 e2 43 00 00 48 85 c0 0f 85 68 01 00 00 48 c7 c7  
RIP  [<ffffffff803433bd>] pci_create_bus+0x59/0x1f3 
 RSP <ffff880006141d50> 
CR2: 0000000000000000 
 <0>Kernel panic - not syncing: Fatal exception 
 (XEN) Domain 0 crashed: rebooting machine in 5 seconds.