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[Xen-bugs] [Bug 550] New: Timer ISR/0: Time went backwards:

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Subject: [Xen-bugs] [Bug 550] New: Timer ISR/0: Time went backwards:
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Date: Tue, 28 Feb 2006 15:17:00 +0000
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           Summary: Timer ISR/0: Time went backwards:
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: dbarrera@xxxxxxxxxx
                CC: hohnbaum@xxxxxxxxxx,pl@xxxxxxxxxx

I am seeing a series of messages on dmesg and on the serial console indicating
that time went backwards.

HW: IBM HS20 Blade, EMT64 
OS: SLES 9 SP2 with Xen builds, starting (in my tests) with changeset 8984.
Observed today with changeset 9013 as well.

Note: the messages also appear on the guest domains dmesg output.

Timer ISR/0: Time went backwards: delta=15017669 cpu_delta=-84982331
shadow=5141025506832 off=859547146 processed=5141870000000
 0: 5141970000000
printk: 8 messages suppressed.
Timer ISR/0: Time went backwards: delta=15035286 cpu_delta=-234964714
shadow=5153025522749 off=99546059 processed=5153110000000
 0: 5153360000000
Timer ISR/0: Time went backwards: delta=15040062 cpu_delta=-224959938
shadow=5153025522749 off=109519181 processed=5153120000000
 0: 5153360000000
printk: 23 messages suppressed.
Timer ISR/0: Time went backwards: delta=15030587 cpu_delta=-4969413
shadow=5156025523767 off=539533727 processed=5156550000000
 0: 5156570000000

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