[Xen-bugs] [Bug 1008] New: domU's clock jumps forward (XEN 3.1) in SLES10 HVM

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1008

           Summary: domU's clock jumps forward (XEN 3.1) in SLES10 HVM
           Product: Xen
           Version: unspecified
          Platform: x86-64
        OS/Version: Linux-2.6
            Status: NEW
          Severity: major
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: lukash33@xxxxxxxxx


Running SLES10 32bit in HVM domU shows significant unexpected time jumps in
domU. Sometimes time jumps a minute forward or even more, sometimes clock seems
to step normally.

Environment and steps to reproduce:
SUN X4600 server with 8 cpus and 32gb of mem.
SLES9.3 64bit as dom0 OS.
XEN 3.1 64bit is installed over SLES9.3 - either from sources or binary.
dom0's uname is 2.6.18-xen SMP x86_64 x86_64 x86_64 GNU/Linux
Boot from SLES10-32bit installation DVD in resque mode (uname is
2.6.16.21-0.8-default).
Login as root with no password and execute:
# yes 'sleep 1; date' | bash
Note time stepping difference - often it jumps far more than 1 seconds.

If I try to install SLES10-32bit
domU's Linux distribution often hangs.
Sometimes it just fails leaving in its "dmesg" complaints abouts DMA timeouts
and so domU's local "disk" write ops failed.
Other symptoms become apparent when I managed to install SLES10 in a domU
(once):
 1) Text login screen becomes dark very fast - it must be timeout occurs which
blanks screen. Pressing SHIFT turns it on again just for a few seconds.
 2) Sometimes, when one types 'root' at the 'Login:' prompt, and then
immediately types password, SLES10 denies login and says: timeout is over (to
type password), making me typing password VERY promptly!

This domU clock effect depends of domU's OS. Windows98 and other linuxes I
tried show no such effect. Only SLES10 32bit DVD distributive could not be even
installed because of clock jumps!


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