60e27aa8fb
EVFILT_WRITE knotes for pipes live on the knlist for the other end of the pipe. Since they do not hold a reference on the corresponding file structure, they may be removed from the knlist by pipeclose() while still remaining active. In this case, there is no knlist lock acquired before filt_pipewrite() is called, so the assertion fails. Fix the problem by first checking whether that end of the pipe has been closed. These checks are memory safe since the knote holds a reference on one end of the pipe, and the pipe structure is not freed until both ends are closed. The checks are not racy since PIPE_EOF is never cleared after being set, and pipe_present is never set back to PIPE_ACTIVE after pipeclose() has been called. PR: 235640 Reported and tested by: pho Reviewed by: kib MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D19224
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