[Bug 197099] System hangs under heavy load during compilation

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197099

            Bug ID: 197099
           Summary: System hangs under heavy load during compilation
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ben at unpatched.de

Created attachment 152185
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=152185&action=edit
Memory usage during compilation

System is 10.1-RELEASE-p4 amd64 on ZFS with 4GB RAM.

I'm trying to compile lang/ghc port, but this also happens while building
www/chromium so I think it's a problem with the memory system.

After some time during the compilation the system hangs with no "Free" memory
according to top. At this time Inactive is around 2.4GB
The system does still ping but shells are unresponsive, even on the console and
there are no error messages. System is unusable and I'm only able to hard
reboot.
Processes in top are in pfault-state.

I thought it was the same as
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594 but the patch
(https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=187594#c197) didn't help.

Memory was tested with memtest and is fine.

Attached is an image showing the memory usage during compilation and after the
hang.

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