On 03/15, Linus Torvalds wrote:
>
> [ Going through old emails, adding relevant people, ie Oleg for
> kernel/exit.c and David because he seems to be the go-to person for
> connector issues judging by commits ]
>
> Patch looks sane to me, and logically that exit_connector thing would
> pair with exit_notify(), but I'd like some comments on it.
Please see the (confusing, my fault) discussion
http://marc.info/?t=139327886600003
But in short, personally I agree with this change too. Just it was not
clear from the changelog (to me ;) which problem this change actually
tries to solve, because in general the task is not waitable after it
reports PROC_EVENT_EXIT.
So I think the patch is fine, but let me repeat:
I hope that someone
can confirm that netlink_broadcast() is safe even if
release_task(current)
was already called, so that the caller has no pids, sighand, is not
visible
via /proc/, etc.
not that I expect this should not work, but still.
> That
> usability issue/race has been there since forever afaik. We probably
> should never have added that process events connector thing, but since
> we did and people apparently use it..
Yes... BTW, Guillaume, I forgot to mention that perhaps you can use
signalfd(SIGCHLD) instead of connector, this is epoll-able too. SIGCHLD
doesn't queue, so it can't tell you which child has exited, but WNOHANG
should work.
Oleg.
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