test-debug-signal-cluster.js fails sometimes (investigate flaky test)
It seems, that many processes write at the "same" time to stderr, and thus this test fails from time to time: When it failes, I always got something like 'Debugger listening on port 12389Debugger listening on port 12390\n\n', i.e. the msg from another process got inserted before the of the message of another process msg.
To make it more reliable (in my case it now succeeds always), I changed it to collect the output w/o any <LF|CR> and finally just substract the expected lines (see http://iws.cs.uni-magdeburg.de/~elkner/tmp/node5/test-concur.patch). I know, as long as the write to stderr doesn't get synced, this test may always fail, however, it now seems to work better.