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http://bugzilla.novell.com/show_bug.cgi?id=559047

http://bugzilla.novell.com/show_bug.cgi?id=559047#c0


           Summary: XEN system hangs with high I/O load
    Classification: openSUSE
           Product: openSUSE 11.2
           Version: Final
          Platform: x86-64
        OS/Version: openSUSE 11.2
            Status: NEW
          Severity: Critical
          Priority: P5 - None
         Component: Xen
        AssignedTo: jdouglas@xxxxxxxxxx
        ReportedBy: g.w.kant@xxxxxxxxxx
         QAContact: qa@xxxxxxx
          Found By: ---
           Blocker: ---


User-Agent:       Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv:1.9.0.15)
Gecko/2009102100 SUSE/3.0.15-0.1.2 Firefox/3.0.15

On two different systems I experienced system hangs when high I/O load occurs
with at least one domU involved. Here I describe the situation on a HP Proliant
with 16GB RAM.
openSUSE 11.2 x86_64 dom0 with one (PV) openSUSE 11.2 x86_64 domU.
Network configuration uses a bridge br0 with the dom0 and the domU network
interfaces added to the bridge.

When for example, copying a large file on the dom0 with scp from the domU to
the dom0, the system dies.

A log captured via a serial port is attached. 

I will repeat the experiment on the other machine (Super Micro based PC) and
provide that log file as well.

Reproducible: Always

Steps to Reproduce:
1. Boot system and login as root
2. xm start domu
3. scp domu:bigfile .
Actual Results:  
System is not responding anymore

Expected Results:  
A stable system

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