@Martin: At least the log you added does not seem to be from a run with 
noapictimer. If you could do and post the dmesg of two boots. Both with 
"apic=debug debug" (acpi=debug is ignored with the default kernel). For one add 
"noapictimer" for the other remove it. Then post both dmesg logs (if possible 
not compressed, just the plain files. makes it simpler to peek on them).
As for prevention: you could also play with "nohz=off" and "highres=off" at the 
cost of higher power usage. This worked for some. Or try the combination from 
the upstream bug "noapic lapic acpi=on" to see if that helps. Of course this 
still is no solution but collecting hints.

-- 
[2.6.27] pausing during boot (several issues)
https://bugs.launchpad.net/bugs/254668
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