Kdump kernel hangs before saving vmcore when executed by Xen dom0

Issue

The kdump kernel may hang with the following or similar messages during initialization:

Checking 'hlt' instruction...  
irq 184, desc: c2308a80, depth: 1, count: 0, unhandled: 0
->handle\_irq():  c204e718, handle\_bad\_irq+0x0/0x1a8
->chip(): c229a3e0, 0xc229a3e0
->action(): 00000000
IRQ\_DISABLED set
unexpected IRQ trap at vector b8  
..MP-BIOS bug: 8254...