Bug or design issue in builder timeouts ?

Our build environment, specially the running of unittests seems to
hang indefinetly (known issue, bug fix is already done but waiting for
acceptance tests to be finished).

When these hangup problems started i verified that i do indeed have
timeout (using the not so loved exec builders inside composite
builder) in the builder but it doesnt seem to stop the builder.

Checked the code while ago and i have faint recollection that the
timeout is only calculated between the execution phases, or if i dont
remember that one right, there's definetly a problem in the
timeoutting as for example, i came to office this morning only to find
out that nothing was build during the weekend as one unittest had hung
up on friday evening.

Know bug ? People interested to fix this ?

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