[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

Mikhail Teterin <mi at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mi at FreeBSD.org
           Severity|Affects Only Me             |Affects Some People
            Version|10.0-RELEASE                |11.2-STABLE

--- Comment #1 from Mikhail Teterin <mi at FreeBSD.org> ---
I'm having this problem now, with 11.2-STABLE r338668. My machine is, actually,
a guest VM. Memory is 8GB, but the OS i386 using PAE.

The role of forkbomb in my case is played by ansible -- which forks off
multiple processes for each of the hosts in the inventory.

Once the message starts appearing, the only "fix" is to reboot -- the problem
remains even after ansible exits. The relevant dmesg is:

Approaching the limit on PV entries, consider increasing either the
vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable.
Approaching the limit on PV entries, consider increasing either the
vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable.
Approaching the limit on PV entries, consider increasing either the
vm.pmap.shpgperproc or the vm.pmap.pv_entry_max tunable.
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
vm_thread_new: kstack allocation failed
[...]

There is no swap configured, but top reports ample free RAM:

Mem: 536M Active, 828M Inact, 141M Wired, 60M Buf, 6529M Free

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