[Bug 244713] Processes hanging in "nfs" state

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244713

            Bug ID: 244713
           Summary: Processes hanging in "nfs" state
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: julien at perdition.city

Hello,

I have a Python webapp which is running in a 10.3-RELEASE JAIL on a
12.1-RELEASE HOST which is randomly hanging in nfs state. Processes are
unkillable and require a hard reboot.

The HOST is running UFS (with SU, but without +J) and the NFS server is running
10.3-RELEASE. NFS4 shares are mounted on the HOST with "nfsv4,ro,bg,late"
options (NFS4 only)

It looks like a deadlock to me and I've attached a procstat -kk of the
offending processes

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