This happens every other use of system_reset -- ie. resetting the system using system_reset while in this panic'd state results in correct functionality. Following the suggestion and booting the guest with noapic results in other IRQ-related errors.

The guest kernel is CentOS 5 2.6.18-53.el5 on x86_64. The host is running 2.6.27.5.

Kernel command line: ro root=/dev/VolGroup01/LogVol00
Initializing CPU#0
PID hash table entries: 4096 (order: 12, 32768 bytes)
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes)
Inode-cache hash table entries: 65536 (order: 7, 524288 bytes)
Checking aperture...
Memory: 746368k/76936k available (2434k kernel code, 21180k reserved, 1235k data, 192k init) Calibrating delay using timer specific routine.. 4793.50 BogoMIPS (lpj=2396750)
Security Framework v1.0.0 initialized
SELinux:  Initializing.
selinux_register_security:  Registering secondary module capability
Capability LSM initialized as secondary
Mount-cache hash table entries: 256
CPU: L1 I cache: 32K, L1 D cache: 32K
CPU: L2 cache: 2048K
SMP alternatives: switching to UP code
ACPI: Core revision 20060707
irq 25, desc: ffffffff803afc80, depth: 1, count: 0, unhandled: 0
->handle_irq():  ffffffff800b54e3, handle_bad_irq+0x0/0x1f6
->chip(): ffffffff802ea700, 0xffffffff802ea700
->action(): 0000000000000000
  IRQ_DISABLED set
unexpected IRQ trap at vector 19
..MP-BIOS bug: 8254 timer not connected to IO-APIC
timer doesn't work through the IO-APIC - disabling NMI Watchdog!
Kernel panic - not syncing: IO-APIC + timer doesn't work! Try using the 'noapic' kernel parameter

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