Attempt to avoid hangs in regressions
Attempt to avoid hangs in regressions

https://users.bitkeeper.org/t/occasional-regression-failure-upgrade-running-in-deleted-dir/577

bk: 59c16065SM3mlS6-Ap2nVlsKVl6rmQ
bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper,bitkeeper-scm/bitkeeper