#10345: Testsuite timeout_multiplier setting does not work as expected -------------------------------------+------------------------------------- Reporter: jstolarek | Owner: Type: bug | Status: closed Priority: normal | Milestone: 8.0.1 Component: Test Suite | Version: 7.11 Resolution: fixed | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Other | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Phab:D982 Wiki Page: | -------------------------------------+------------------------------------- Comment (by thomie): Replying to [comment:1 thomie]:
The issue only I seem to be having is that running `python testsuite/timeout/timeout.py 10 'echo ok' ` doesn't return immediately, but only after 10 seconds.
I finally figured this one out. I had `stty tostop` set in `~/.bashrc`. When `stty tostop` is set, a background process that tries to write to the terminal receives a SIGTTOU signal, which suspends it. In timeout.py, the first thing the child process does is call `os.setpgrp()`. This creates a new process group, with the child process itself as process group leader. Because only one process group per session can be the foreground process group, it will be a background process group. I'm not sure yet //why// timeout.py turns the child process that it creates into a background process. One implication is that `CTRL-C` doesn't kill it. References: * https://www.win.tue.nl/~aeb/linux/lk/lk-10.html * http://www.linusakesson.net/programming/tty/index.php -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10345#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler