linux-kernel - 3.0.38: strange boot message: "Time: 165:165:165 Date: 165/165/65" with Xen

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Date:	Wed, 26 Sep 2012 15:30:10 +0200
From:	"Ulrich Windl" <Ulrich.Windl@...uni-regensburg.de>
To:	<linux-kernel@...r.kernel.org>
Subject: 3.0.38: strange boot message: "Time: 165:165:165  Date:
 165/165/65" with Xen

Hi!

I just discovered a strange "<6>[    0.123867] Time: 165:165:165  Date: 165/165/65" boot message in a Xen DomU VM for SLES11 SP2 on AMD Opteron (x86_64). The context is:

...
<6>[    0.080197] Initializing cgroup subsys net_cls
<6>[    0.080199] Initializing cgroup subsys blkio
<6>[    0.080204] Initializing cgroup subsys perf_event
<4>[    0.080245] ENERGY_PERF_BIAS: Set to 'normal', was 'performance'
<4>[    0.080245] ENERGY_PERF_BIAS: View and update with x86_energy_perf_policy(
8)
<6>[    0.080293] SMP alternatives: switching to UP code
<6>[    0.103716] Brought up 1 CPUs
<6>[    0.103788] devtmpfs: initialized
<6>[    0.103977] print_constraints: dummy:
<6>[    0.123867] Time: 165:165:165  Date: 165/165/65
<6>[    0.123908] NET: Registered protocol family 16
<6>[    0.124081] SMP alternatives: switching to SMP code
<6>[    0.150019] Brought up 4 CPUs
<3>[    0.150019] PCI: Fatal: No config space access function found
<6>[    0.150019] PCI: setting up Xen PCI frontend stub
...

Maybe it's related to this hypervisor message (xm dmesg) in Xen Dom0 (but the RTC is at 70, right?):
(XEN) mm.c:833:d1 Non-privileged (1) attempt to map I/O space 000000f0
(XEN) mm.c:833:d3 Non-privileged (3) attempt to map I/O space 000000f0
(XEN) mm.c:833:d2 Non-privileged (2) attempt to map I/O space 000000f0
(XEN) mm.c:833:d1 Non-privileged (1) attempt to map I/O space 000000f0
(XEN) mm.c:833:d2 Non-privileged (2) attempt to map I/O space 000000f0

It's not a big issue, but maybe if the RTC cannot be read, it's better to skip rather tan outputting a wrong date/time.

Regards,
Ulrich


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