[Bug 282713] Process enters in STOP state and doesn't respond to any signal.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282713

            Bug ID: 282713
           Summary: Process enters in STOP state and doesn't respond to
                    any signal.
           Product: Base System
           Version: Unspecified
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rupeshpilania@gmail.com

Process enters in STOP state and doesn't respond to any signal.
Currently are using FreeBSD 13.0
We are hitting exactly same issue for user space processes.
Symptoms are exactly same except threads are waiting for umtxqb
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242724

Another similar bug was reported here.
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208138

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