Recent Debian distributions (Squeeze and Wheezy) ship with a variant of the Almquist Shell as /bin/sh. This trips up many scripts which presume /bin/bash is /bin/sh, including runltp and ltpmenu and many test-running scripts such as testscripts/runEALtests.sh and testcases/kernel/fs/doio/rwtest. Most blatant symptom is the use of '[[' in place of '['.
First noticed when playing with ltp-20140115 but still visible in master/HEAD as of 2014-03-20 (commit SHA of bc63a8f).