[Bug 202409] vm_thread_new: kstack allocation failed on FreeBSD 10.x

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202409

            Bug ID: 202409
           Summary: vm_thread_new: kstack allocation failed on FreeBSD
                    10.x
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ota at j.email.ne.jp

After creating some processes/threads, I encounter following to errors and the
are printed to dmesg.

pmap_mapdev: Couldn't alloc kernel virtual memory
vm_thread_new: kstack allocation failed

System becomes unstable thereafter most of times although it depends on what
failed to allocate memory.

This happens on any 10.x releases but not 11 current.

Easiest way to reproduce is use benchmarks/forkbomb

% forkbomb -f

brings the above errors in few seconds.

I recall a special fix applied to 9.x stable a while ago but the change didn't
seem to apply to 10.x releases.

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