09e2465407e6179d3833a68efd5ddb71bb3c3b23
This makes sure that if we learn via inotify or another event source that a cgroup is empty, and we checked that this is indeed the case (as we might get spurious notifications through inotify, as the inotify logic through the "cgroups.event" is pretty unspecific and might be trigger for a variety of reasons), then we'll enqueue a defer event for it, at a priority lower than SIGCHLD handling, so that we know for sure that if there's waitid() data for a process we used it before considering the cgroup empty notification. Fixes: #6608
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