[Bug 195262] [lor] Possibly two LORs: entropy harvest mutex and scrlock, and entropy harvest mutex and sleepq chain

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Wed Feb 25 23:37:03 UTC 2015


Xin LI <delphij at FreeBSD.org> changed:

           What    |Removed                     |Added
             Status|New                         |Open

--- Comment #7 from Xin LI <delphij at FreeBSD.org> ---
(In reply to John Baldwin from comment #6)
The code in question have received a major refactor and the issue no longer
exists (in r262496: mutex is no longer held in random_kthread before sleeping).

In the new world order, the spin lock is only acquired as a leaf mutex in
random_harvestq_internal() and that would avoided all LOR cases (I would
probably move get_cyclecount() out from the locked scope but that's a different

So I think the _right_ fix is probably just merge the refactor back to
stable/10 instead.

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