[Bug 238168] kern/kern_conf.c: two 'if' statements with identical conditional expressions

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Mon May 27 11:32:46 UTC 2019


Konstantin Belousov <kib at FreeBSD.org> changed:

           What    |Removed                     |Added
         Resolution|---                         |Not A Bug
             Status|Open                        |Closed

--- Comment #1 from Konstantin Belousov <kib at FreeBSD.org> ---
The D_INIT flag might be set by another thread while we unlocked dev_mtx in the
D_NEEDGIANT block.  This is a common kernel pattern, unlock, do sleepable
resource allocation, relock, and then recheck the original condition which
might be invalidated by other thread meantime.

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