[Bug 242184] r354398 causes panic in nfs_unmount during shutdown

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242184

            Bug ID: 242184
           Summary: r354398 causes panic in nfs_unmount during shutdown
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: rk at ronald.org

Created attachment 209375
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=209375&action=edit
core.txt.3

Recent 12.1-STABLE kernels panic on every reboot/shutdown in nfs_unmount (when
NFS file systems are mounted). I tracked it down to the change in r354398:

  MFC r353891:
  Fix interface between nfsclient and vnode pager. 

Starting with r354398 the system panics on every reboot/shutdown while
mounted NFS file systems are present:

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 10
fault virtual address   = 0x18
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xffffffff80acc688
stack pointer           = 0x28:0xfffffe0075d55350
frame pointer           = 0x28:0xfffffe0075d553a0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1 (init)
trap number             = 12
panic: page fault
cpuid = 0
time = 1574577411
KDB: stack backtrace:
#0 0xffffffff80c1d917 at kdb_backtrace+0x67
#1 0xffffffff80bd0dad at vpanic+0x19d
#2 0xffffffff80bd0c03 at panic+0x43
#3 0xffffffff810aa82c at trap_fatal+0x39c
#4 0xffffffff810aa87f at trap_pfault+0x4f
#5 0xffffffff810a9eb1 at trap+0x2a1
#6 0xffffffff8108364c at calltrap+0x8
#7 0xffffffff8122ea0c at VOP_LOCK1_APV+0x7c
#8 0xffffffff80cb26f4 at _vn_lock+0x44
#9 0xffffffff80ca1a88 at vputx+0x138
#10 0xffffffff80ba903d at lf_free_lock+0x25d
#11 0xffffffff80ba940f at lf_purgelocks+0x2df
#12 0xffffffff80c8ffa4 at vop_stdadvlockpurge+0x14
#13 0xffffffff8122f4bc at VOP_ADVLOCKPURGE_APV+0x7c
#14 0xffffffff80ca2a38 at vgonel+0x248
#15 0xffffffff80ca2112 at vflush+0x312
#16 0xffffffff80ad3865 at nfs_unmount+0xd5
#17 0xffffffff80c99e09 at dounmount+0x579

Revision r354394 is stable.
Core information core.txt.3 is attached. I can make vmcore available when
needed.

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