[Xen-bugs] [Bug 1000] New: PAE dom0 keeps printing "Timer ISR/0: Time went backwards"

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1000

           Summary: PAE dom0  keeps printing "Timer ISR/0: Time went
                    backwards"
           Product: Xen
           Version: unstable
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: yunfeng.zhao@xxxxxxxxx


Environment:
------------
Service OS (ia32/ia32e/IA64): PAE 
Guest OS (ia32/ia32e/IA64): 
Change Set: 15376
Hardware: 



Bug detailed description:
--------------------------

When I run regular nightly testing on PAE host, I found that xen0 will print
call traces continuously. If this issue appear, the basic case can not pass,
such as one_VMX, one_XENU. And xen0 reponse very slow this time. it appears
very often but not every time.
We met the issue on Fedora5 dom0.


Reproduce steps:
----------------


Current result:
----------------


Expected result:
----------------


Basic root-causing log:
----------------------

Timer ISR/0: Time went backwards: delta=-39995687 delta_cpu=50004313 shadow=0
off=3548840044663 
processed=3548880000000 cpu_processed=3548790000000
 0: 3548790000000
 1: 3548880000000
printk: 137 messages suppressed.
Timer ISR/1: Time went backwards: delta=-29997618 delta_cpu=80002382 shadow=0
off=3553870041177 
processed=3553900000000 cpu_processed=3553790000000
 0: 3553900000000
 1: 3553790000000
printk: 86 messages suppressed.
Timer ISR/1: Time went backwards: delta=-39996075 delta_cpu=60003925 shadow=0
off=3558800042007 
processed=3558840000000 cpu_processed=3558740000000
 0: 3558840000000
 1: 3558740000000
printk: 115 messages suppressed.
Timer ISR/1: Time went backwards: delta=-39996777 delta_cpu=60003223 shadow=0
off=3563820042663 
processed=3563860000000 cpu_processed=3563760000000
 0: 3563860000000
 1: 3563760000000
printk: 171 messages suppressed.
Timer ISR/1: Time went backwards: delta=-39996569 delta_cpu=50003431 shadow=0
off=3568800042278 
processed=3568840000000 cpu_processed=3568750000000
 0: 3568840000000
 1: 3568750000000
printk: 92 messages suppressed.
Timer ISR/1: Time went backwards: delta=-19996393 delta_cpu=80003607 shadow=0
off=3573870039962 
processed=3573890000000 cpu_processed=3573790000000
 0: 3573890000000
 1: 3573790000000
printk: 81 messages suppressed.
Timer ISR/1: Time went backwards: delta=-19996860 delta_cpu=40003140 shadow=0
off=3578850038647 
processed=3578870000000 cpu_processed=3578810000000
 0: 3578870000000
 1: 3578810000000
printk: 81 messages suppressed.


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