[Bug 239279] Crush system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239279

            Bug ID: 239279
           Summary: Crush system
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: alien.xupypr at gmail.com

Hello!
I discovery crytical bug.
Any user can use command grep and to bring system to slow as halting.
Command: grep . /dev/zero
Testing system: FreeBSD freebsd 12.0-RELEASE FreeBSD 12.0-RELEASE r341666
GENERIC  amd64

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