This hangs ``` pants test test queue py``` This passes ``` p

Question

This hangs ``` pants test test queue py``` This passes ``` pants test debug test queue py```

witty-crayon-22786 · Answer

` debug` runs the process interactively such that it will actually be able to read `stdio` and will have a `TTY`

witty-crayon-22786 · Answer

whereas ` no debug` has empty stdio

witty-crayon-22786 · Answer

if the test is attempting to interact with the terminal that might cause it to hang when run in the background

witty-crayon-22786 · Answer

to confirm i d recommend attaching to the test process with <https github com benfred py spy|py spy> with something like ```sudo py spy dump p $testpid```

melodic-thailand-99227 · Answer

Forgot to mention there s also multiprocessing involved

witty-crayon-22786 · Answer

i don t think that that could cause this but perhaps as mentioned highly recommend `py spy` as it will tell you where it is hung