[Bug 1168526] Re: race condition causing lxc to not detect container init process exit

[Pavel Bennett]

I should add that these "forwarded signal 2" lines are due to me
pressing Ctrl+C and are not actually relevant.

Have you been able to repro this bug on kernel 3.8.6?

I'm thinking how to fix this as lxc_spawn is what gets the pid which is
needed by lxc_poll to listen for SIGCHLD from the correct pid, but
lxc_poll should logically go before lxc_spawn to avoid this race.

How about starting lxc_poll first in a queueing mode, so it just
accumulates the signals but doesn't process them yet? When "handler->pid
= lxc_clone(do_start, handler, handler->clone_flags);" returns, notify
lxc_poll of the pid, thus it should now have all the info it needs,
switching it out of queueing mode and initiating a loop to process the
queued events now that the pid is known.

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Title:
  race condition causing lxc to not detect container init process exit

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