It seems that this is a locale problem.
I've got this messages:
bad data in /proc/uptime
bad data in /proc/loadavg
Recompiling didn't help, 'LC_ALL=C top' works OK.
Damn! The subject should be (crash example):
Created attachment 1592 [details]
strace of running top with LANG=sv_SE
I could reproduce this bug with LANG=sv_SE too.
Attached a strace.
Fixed for beta5 (procps-2.0.7-2)