This commit eliminates all issues around pid reuse in the cgroup name.
Normally, the native cgroup cleaner (or systemd) would be responsible for garbage-collecting the cgroup of a previous bst invocation, but if we burn enough PIDs fast enough, it's also entirely possible for a new bst to start while the cleaner of an older invocation is busy cleaning up the old cgroup.
To fix the problem, we use a random 128-bit identifier instead of the pid in the name of the cgroup.
This commit eliminates all issues around pid reuse in the cgroup name.
Normally, the native cgroup cleaner (or systemd) would be responsible for garbage-collecting the cgroup of a previous bst invocation, but if we burn enough PIDs fast enough, it's also entirely possible for a new bst to start while the cleaner of an older invocation is busy cleaning up the old cgroup.
To fix the problem, we use a random 128-bit identifier instead of the pid in the name of the cgroup.