[Xen-bugs] [Bug 1170] New: qemu-dm LSI 8953U hang with io request > 512KB

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1170

           Summary: qemu-dm LSI 8953U hang with io request > 512KB
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Windows
            Status: NEW
          Severity: major
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: m.pierron@xxxxxxxx


When a request for read or write io greater than 512KB to the scsi disk with
the LSI 8953U driver supplied by microsoft inside a hvm handled by qemu-dm,
qemu-dm hang and the cpu which run it rise to 100% usage. We have to destroy
the HVM which is not responding anymore.

name="win"
ostype="windowsxp"
memory=1024
vcpus=2
cpu_weight = 1024
cpu_cap = 0
on_crash="destroy"
on_poweroff="destroy"
on_reboot="restart"
localtime=1
builder="hvm"
extid=0
device_model="/usr/lib64/xen/bin/qemu-dm"
kernel="/usr/lib/xen/boot/hvmloader"
boot="dc"
disk=[ 'phy:/dev/vg0/lv0,hda,w', 'phy:/dev/vg0/lv1,hdb,w',
'phy:/dev/vg0/lv2,sda,w', 'phy:/dev/vg0/lv3,sdb,w', ]
vif=[ 'mac=00:16:3e:3f:d5:7a,type=netfront', ]
stdvga=0
sdl=0
vnc=1
vncunused=1
apic=1
acpi=1
pae=0
usb=1
usbdevice="tablet"
serial="pty"

suse:/etc/xen/vm # xm info
host                   : suse
release                : 2.6.18.8-xen
version                : #1 SMP Sun Feb 17 20:17:08 CET 2008
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
cores_per_socket       : 4
threads_per_core       : 1
cpu_mhz                : 3001
hw_caps                :
bfebfbff:20000800:00000000:00000140:0000e3bd:00000000:00000001
total_memory           : 4095
free_memory            : 23
node_to_cpu            : node0:0-3
xen_major              : 3
xen_minor              : 3
xen_extra              : -unstable
xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler          : credit
xen_pagesize           : 4096
platform_params        : virt_start=0xffff800000000000
xen_changeset          : Wed Feb 13 18:30:12 2008 +0000 17042:e1dde6f8bc87
cc_compiler            : gcc version 4.2.1 (SUSE Linux)
cc_compile_by          : root
cc_compile_domain      : xen
cc_compile_date        : Sun Feb 17 20:08:34 CET 2008
xend_config_format     : 4


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