[Bug 230008] [panic] [fdescfs] Page fault in vn_finished_write+0x13

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230008

            Bug ID: 230008
           Summary: [panic] [fdescfs] Page fault in vn_finished_write+0x13
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: pho at FreeBSD.org

20180724 11:01:27 all (5/573): fdescfs.sh

Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0x70
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80c82943
stack pointer           = 0x28:0xfffffe002e0f97b0
frame pointer           = 0x28:0xfffffe002e0f97c0
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         = 76129 (ls)
[ thread pid 76129 tid 100138 ]
Stopped at      vn_finished_write+0x13: cmpq    $0,ll+0x4f(%rax)
db>

Details @ https://people.freebsd.org/~pho/stress/log/fdescfs-3.txt

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