[Bug 204426] Processes terminating cannot access memory

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204426

--- Comment #114 from Robert Blayzor <rblayzor at inoc.net> ---
Even with the suggested patch, now seeing processes occasionally hang in state:

dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  0  120 sleep   vmf_de
dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  1  120 sleep   vmf_de
dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  2  120 sleep   vmf_de
dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  2  120 sleep   vmf_de
dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  3  120 sleep   vmf_de
dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  2  120 sleep   vmf_de
dev at mta0 [~] procstat -ta | grep 7893
 7893 100155 dovecot          -                  2  120 sleep   vmf_de



When this happens we usually end up with a process that leaves a lot of
detached sockets stuck in a CLOSED state. The process normally becomes
unkillable and only a reboot clears the problem.

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