Re: Weird time-zone oscillation

[David Kubicek <foceni@gmail.com>]

On 12/13/2009 07:50 PM, Kumar Appaiah wrote:
> On Sun, Dec 13, 2009 at 07:39:31PM +0100, David Kubicek wrote:
> > # export TZ=Europe/Prague
> > # for i in `seq 1 20`; do ./posix; date; done
> > 1260496200
> > Sun Dec 13 19:04:24 CET 2009
> > ...
>
> (Note: 2600 vs. 6200):
> [kumar@bluemoon ~] for i in `seq 1 10`;do TZ=Europe/Prague ./a.out&&  TZ=Europe/Prague date ;done
> 1260492600
> Sun Dec 13 19:47:24 CET 2009
> 1260496200
>
> > # export TZ=CET-1CES,M3.5.0,M10.5.0
> > # for i in `seq 1 20`; do ./posix; date; done
> > 1260496200
> > Sun Dec 13 19:04:36 CET 2009
> > ...
> > # unset TZ
>
> (The same)
> [kumar@bluemoon ~] for i in `seq 1 10`;do TZ="CET-1CES,M3.5.0,M10.5.0" ./a.out&&  TZ="CET-1CES,M3.5.0,M10.5.0" date ;done
> 1260496200
> Sun Dec 13 19:48:03 CET 2009
> 1260492600
>
> OK, where do I move next? :-) Especially given that these things don't
> happen in a fresh sid chroot, I am really wondering what unearthly
> configuration option could be causing this.

OK, this is now officially insane. I have no firm idea what could be the 
culprit, we can however test some scenarios, which could reveal 
something of substance. In your situation, I'd now use gdb with 
libc6-dbg and debug all function calls to pinpoint the reason, but I 
cannot reproduce it on my system. :(

So try "dpkg-reconfigure tzdata" first and then let's refresh a few more 
packages:

# apt-get update
# apt-get install --reinstall libc6 libc6-i686 libgcc1

If that doesn't help, try posix-in-loop test from single-user mode. Make 
sure no other processes are running.

I'm not aware of any configuration which could cause this (except for TZ 
and /etc/timezone, of course).


--
David Kubicek