[Bug 242369] tmpfs + union_fs panic: lockmgr_xlock_hard: recursing on non recursive lockmgr

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242369

            Bug ID: 242369
           Summary: tmpfs + union_fs panic: lockmgr_xlock_hard: recursing
                    on non recursive lockmgr
           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: mr.xanto at gmail.com

Created attachment 209607
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=209607&action=edit
panic screen

12.1 Release panic with mounted unionfs with tmpfs.

How-to repeat:
1) Boot with FreeBSD-12.1-RELEASE-amd64-bootonly.iso in live-cd mode.
2) mount -t tmpfs -o rw,size=512M tmpfs /net
3) mount_unionfs /net/ /usr/
4) mount_unionfs /net/ /var/
5) mount_unionfs /net/ /tmp/
6) dhclient em0

There is record of the panic: https://yadi.sk/i/O7NLAgjwVN61oA

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