[Xen-bugs] [Bug 542] New: qemu-dm segfault with multiple HVM domains

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=542

           Summary: qemu-dm segfault with multiple HVM domains
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Hardware Support
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: jclemens@xxxxxxxxxxxxxxx


Running changeset 8932 (and earlier) of xen-unstable, on a large VT machine (4s,
2c, HT), I get qemu-dm segfaults when I try to lunch more than one windows
domain at a time. 

Turning on core dumps, the core files created by qemu-dm appear to be garbage,
and the segfault message on the dom0 console indicates hey tried to jump to a
null code page:

qemu-dm[4961]: segfault at 0000000000000000 rip 0000000000000000 rsp
0000000040800198 error 14
qemu-dm[4963]: segfault at 0000000000000000 rip 0000000000000000 rsp
0000000040800198 error 14

rsp seems to be the same each time.  The easiest way to reproduce is set up a
few (i have 4) windows domains (I'm using windows 2003), and create them in
rapid succession.  Within a few minutes, almost all the qemu-dm's will have
segfaulted except for one.  Launching one domain does not seem to trigger this
problem. 

Marking as critical because you can't run multiple windows domains on the same
machine, please change if that's too aggressive.

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