9c83dab96c
cpuset_rel_defer() is supposed to be functionally equivalent to cpuset_rel() but with anything that might sleep deferred until cpuset_rel_complete -- this setup is used specifically for cpuset_setproc. Add in the missing unr free to match cpuset_rel. This fixes a leak that was observed when I wrote a small userland application to try and debug another issue, which effectively did: cpuset(&newid); cpuset(&scratch); newid gets leaked when scratch is created; it's off the list, so there's no mechanism for anything else to relinquish it. A more realistic reproducer would likely be a process that inherits some cpuset that it's the only ref for, but it creates a new one to modify. Alternatively, administratively reassigning a process' cpuset that it's the last ref for will have the same effect. Discovered through D27498. MFC after: 1 week
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