Messages in this thread | | | Date | Mon, 2 Jun 2008 09:10:16 +0100 | From | Alan Cox <> | Subject | Re: 2.6.25.3: su gets stuck for root |
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> Guys, you should test if "kill -CONT $pid" wakes the process up. > It might be possible that some obscure bug appeared in the tty > code resulting in SIGTTOU sometimes being sent to the caller, > although that seems rather strange :-/
Not really. The task would get suspended if it attempted to change the tty settings while not being session leader. This is part of the POSIX and BSD job control. A race (either kernel or in something like sshd/bash) would do that and could have been caused by any of the timing changes recently.
That would also explain why I can't duplicate it, and the sleep observation.
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