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Strange problems with slipping dates



I've noticed a very strange problem.
I'm running an up-to-date bo system.
The other day, I've seen in the setuid.changes that some dates for 
special files had slipped by exactly one minute in the past. Eg:
<   root     floppy     2,   0 Dec  4 19:34 /dev/fd0
<   root     floppy     2,   4 Dec  4 19:34 /dev/fd0u720
<   root     floppy     2,  24 Dec  4 19:34 /dev/fd0u1760
<   root     floppy     2,   1 Dec  4 19:34 /dev/fd1
<   root     floppy     2,  13 Dec  4 19:34 /dev/fd1h410
<   root     floppy     2,  17 Dec  4 19:34 /dev/fd1h420
<   root     floppy     2,  21 Dec  4 19:34 /dev/fd1h880
---
>   root     floppy     2,   0 Dec  4 19:33 /dev/fd0
>   root     floppy     2,   4 Dec  4 19:33 /dev/fd0u720
>   root     floppy     2,  24 Dec  4 19:33 /dev/fd0u1760
>   root     floppy     2,   1 Dec  4 19:33 /dev/fd1
>   root     floppy     2,  13 Dec  4 19:33 /dev/fd1h410
>   root     floppy     2,  17 Dec  4 19:33 /dev/fd1h420

I didn't pay much attention to this. Until today when I realised that 
mirror has been running for 24 hours downloading the complete debian 
archive because some dates had slipped by one minute in the past on 
my
machine !

I rebooted, but the dates remained the same...
Could this be a libc problem ?
A kernel problem ? (scoring a 10 days uptime here !)
Something else ?
Anyone constated the same problem ?

Now, I remember updating timezone recently. Would have someone 
changed the PST timezone ? Hmmm ? By a few seconds ? Make the changes 
seemingly randomly distributed in the filesystem ? But for mirrored 
directories, as mirror does an explicit touch on every file it 
downloads, with zero seconds, a small shift backwards would make all 
the files obsolete...
If this is it, we should warn mirror users...

Phil.



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