fascinating bug to do with apm and child processes...

[Andy Green]

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Somebody in the thread at some point said:

|        WNOHANG     return immediately if no child has exited.
|
| so under no circumstances should this ever hang... but oooh. it does. now
| interestingly i attached to apm to see what it was doing.. and
lo-and-behold,
| it woke up and continued to execute then exited with sh reaping the
child then
| e reaping the sh and e waking up again:

There's some process freezing step as part of entering suspend, I guess
it is to do with that.  FWIW echo mem > /sys/power/state also the echo
never returns until it comes back in resume.

Roh sent an amusing link once about the madness of suspending processes
in Linux maybe he can dig it out and post it here.

- -Andy
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