Cope with EAGAIN from fcntl(fd, F_SETLKW ...)
Cope with EAGAIN from fcntl(fd, F_SETLKW ...)

According to Illumos man pages...

fcntl(fd, F_SETLKW ...) can EAGAIN if "the file is currently being
mapped to virtual memory using mmap(2)"

This can happen if we are in-flight on a message read.

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