[Xen-bugs] [Bug 855] New: Continual save/restore cycle will crash hypervisor

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=855

           Summary: Continual save/restore cycle will crash hypervisor
           Product: Xen
           Version: unstable
          Platform: IA64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: eric.schwartz@xxxxxx
                CC: ahs3@xxxxxxxxx


I wrote a small script to continually save and restore a PV domU under
xen/unstable on ia64:

for i in $(seq 1 30); do
  echo -n "Saving (#$i)... "
  xm save rhel5rcs2pv /var/local/rhel5rcs2pv-booted
  echo "done."
  echo -n "Restoring... "
  xm restore /var/local/rhel5rcs2pv-booted
  echo "done."
done

Generally somewhere around the 23rd or 26th iterations, the hypervisor will
crash with a message like this:

(XEN)(file=/home/agriffis/rhel5b2rc/rhel5-kernel-rpm/BUILD/kernel-2.6.18/xen/include/asm/mm.h,
line=180) Error pfn 11f568: rd=f000000007b70080, od=f000000004e6c080,
caf=00b1c08080000004, taf=fffffffff0000001
(XEN) $$$$$ PANIC in domain 0 (k6=0xf000000007b48000): copy_to_guest to foreign
domain

This is reproducible, but may take longer on some machines than others.  When
reproducing, you may wish to replace the index iteration with a simple

while /bin/true; do
....
done

as it might take more or less iterations on any given machine.  I have been
able to reproduce this on every machine I've tried it on, however-- it just
takes longer on some.


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