Comment 2 for bug 1613602

From the attached backtrace (and also the backtrace of the related bug 1613605), this doesn't seem to be a problem caused by repowerd (or USC/Mir). It's just exhibited in these two programs because they try to log with timestamps, which indirectly involve timezone calculations (inside libc, TZ calculations are not performed explicitly by either repowerd or USC).

repowerd in particular doesn't even handle timestamps itself, it just calls the vsyslog() function, which adds timestamps internally.