[Xen-bugs] [Bug 664] New: 64bit 2CPU SMP guest hangs: ata1: command 0x25 timeout, stat 0x50 host_stat 0x64

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=664

           Summary: 64bit 2CPU SMP guest hangs: ata1: command 0x25 timeout,
                    stat 0x50 host_stat 0x64
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: critical
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: esmith@xxxxxxxxxxxxxxx


When you put a RHEL4U2-64bit 2CPU SMP fully virtualized guest under load it
tends to hang.  The guest console reports the ata command timeout errors and
doen't recover.  The XEN console reports the "(XEN) spurious IRQ irq got=-1"
messages (see bug #663) but nothing interesting about the hung guest.

Test Configuration:
Dell Precision WorkStation 380, Dual Core, 2GB, 3 SATA (Intel VT)
64bit XEN Hypervisor on a RHEL4U2 64bit root (/dev/sda)
64bit fully virtualized (HVM) guest RHEL4U2 256MB (/dev/sdc)
      pae=1, acpi=1, apic=1
      kernargs noapic

Guest console:
ata1: command 0x25 timeout, stat 0x50 host_stat 0x64


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