Description of problem:

Although network config appears normal, cannot reach any host except local
machine ip addr.

Version-Release number of selected component (if applicable):

kernel: 2.6.18-1.2857.4.2.fc6.0.2.sctxen

How reproducible: always


Steps to Reproduce:
1. Boot into xen kernel 2.6.18-1.2857.4.2.fc6.0.2.sctxen
2. Attempt to ping local gateway or any other host
3.
  
Actual results:

Ping unsuccessful to any host except local machine ip address
"dmesg" reports truncated IRQ numbers compared to non-xen kernel
"dmesg" reports 251 instances of "late interrupt" on eth0

Expected results:

Successful ping to any reachable network host
"dmesg" report normal IRQ numbers
No "late interrupt" messages

Additional info:

The IRQ assignments don't look right to me. Here's how they differ in
"dmesg" between non-Xen (<) and Xen (>) kernel boots. At a glance, it looks like
the IRQ numbers are being truncated.

191c163
< ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169
---
> ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 16
193c165
< ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 16 (level, low) -> IRQ 169
---
> ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 16 (level, low) -> IRQ 16
195c167
< ACPI: PCI Interrupt 0000:00:1c.1[B] -> GSI 17 (level, low) -> IRQ 177
---
> ACPI: PCI Interrupt 0000:00:1c.1[B] -> GSI 17 (level, low) -> IRQ 17
197c169
< ACPI: PCI Interrupt 0000:00:1c.3[D] -> GSI 19 (level, low) -> IRQ 185
---
> ACPI: PCI Interrupt 0000:00:1c.3[D] -> GSI 19 (level, low) -> IRQ 18


Also, there are over 250 of these messages in "dmesg":

eth0: late interrupt.

Here are the last several lines from "dmesg":

eth0: late interrupt.
device vif0.0 entered promiscuous mode
xenbr0: port 1(vif0.0) entering learning state
xenbr0: topology change detected, propagating
xenbr0: port 1(vif0.0) entering forwarding state
device peth0 entered promiscuous mode