[Xen-bugs] [Bug 1114] New: VBD crashes Dom0

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1114

           Summary: VBD crashes Dom0
           Product: Xen
           Version: unspecified
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: skinkie@xxxxxxxxx


I created a benchmark setup using NFS storage and Virtual Disk Files. My memory
is 8GB, my virtual disk files are 16GB.

In my DomU I mounted the virtual disks as 'more storage', hdb and hdc. My hda
is an iSCSI lun. I use a plain file as large as 16GB, no qcow what so ever.

Using the tool bonnie++ in the configuration 10g I am able to crash the Dom0
which becomes totally unresponsive. When I run bonnie++ with 4g disk size
option (using the same 16GB image) I don't have problems. I assume Xen tries to
map the entire 'loopback' device to memory (the performance of 4g indicates
such thing) and probably has memory starvation.


When I use an iSCSI lun to perform the same test. The system is has no
problems.

Xen version 3.1.2


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