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When asked to use kqueue, AIO stores its internal state in the
`kn_sdata' member of the newly registered knote. The problem is that this member is overwritten by a call to kevent(2) with the EV_ADD flag, targetted at the same kevent/knote. For instance, a userland application may set the pointer to NULL, leading to a panic. A testcase was provided by the submitter. PR: kern/118911 Submitted by: MOROHOSHI Akihiko <[email protected]> MFC after: 1 day
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