[Xen-bugs] [Bug 1098] [version 3.1.0_15042-51] clocksource/0: Time went backwards

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1098





------- Comment #12 from ian.marlier@xxxxxxxxxxxxxxxxxxx  2007-11-07 11:27 
-------
I have been able to confirm that the same problem exists in the 2.6.23 kernel
(or, at the very least, in the version of the 2.6.23 kernel that's currently in
the opensuse factory tree).

Kernel and xen version information:
offxen2:~ # uname -a
Linux offxen2 2.6.23.1-12-xen #1 SMP 2007/11/01 23:00:04 UTC x86_64 x86_64
x86_64 GNU/Linux
offxen2:~ # xm info
host                   : offxen2
release                : 2.6.23.1-12-xen
version                : #1 SMP 2007/11/01 23:00:04 UTC
machine                : x86_64
nr_cpus                : 4
nr_nodes               : 1
sockets_per_node       : 2
cores_per_socket       : 2
threads_per_core       : 1
cpu_mhz                : 2010
hw_caps                :
178bfbff:ebd3fbff:00000000:00000010:00002001:00000000:0000001f
total_memory           : 16383
free_memory            : 15638
max_free_memory        : 15954
max_para_memory        : 15950
max_hvm_memory         : 15904
xen_major              : 3
xen_minor              : 1
xen_extra              : .0_15042-67
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          : 15042
cc_compiler            : gcc version 4.2.3 20071030 (prerelease) (SUSE Linux)
cc_compile_by          : abuild
cc_compile_domain      : suse.de
cc_compile_date        : Sat Nov  3 23:25:20 UTC 2007
xend_config_format     : 4
offxen2:~ # 


Once again, I started three domains (one opensuse 10.3, one Windows Server
2003, one Windows XP).  In each of those three domains, I started a run of
BurnInTest, testing the CPU, memory, and disk access.

These messages appeared in /var/log/messages:
Nov  7 12:14:32 offxen2 kernel: [ 4106.857173] clocksource/0: Time went
backwards: delta=-30792473 shadow=4106017137892 offset=840032129
Nov  7 12:14:32 offxen2 kernel: [ 4107.514152] clocksource/2: Time went
backwards: delta=-30007277 shadow=4107017063292 offset=497083784
Nov  7 12:14:55 offxen2 kernel: [ 4130.749697] clocksource/3: Time went
backwards: delta=-90267529 shadow=4130007803982 offset=741888839
Nov  7 12:14:58 offxen2 kernel: [ 4133.152023] clocksource/2: Time went
backwards: delta=-28481309 shadow=4133007815495 offset=144202833

Immediately thereafter, the machine locked up completely.  All network
connectivity was lost, as was the ability to operate the machine at the
console.  As far as I can tell, no messages were output to the console, but it
should be noted that I was not physically at the console at the time.


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