[Bug 218189] panic starting Xorg after r315949

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218189

            Bug ID: 218189
           Summary: panic starting Xorg after r315949
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: freebsd at charles.lecklider.org

Created attachment 181275
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181275&action=edit
dmesg

r315943 works fine. r315949 and later panic running startx:

Fatal trap 12: page fault while in kernel mode
cpuid = 5; apic id = 05
fault virtual address   = 0x4
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff82d50994
stack pointer           = 0x28:0xfffffe10506cc4b0
frame pointer           = 0x28:0xfffffe10506cc4b0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 3
current process         = 1692 (Xorg)
trap number             = 12
panic: page fault
cpuid = 5
KDB: stack backtrace:
#0 0xffffffff80a9e497 at kdb_backtrace+0x67
#1 0xffffffff80a5aaa6 at vpanic+0x186
#2 0xffffffff80a5a913 at panic+0x43
#3 0xffffffff80ec5430 at trap_fatal+0x320
#4 0xffffffff80ec55fc at trap_pfault+0x1bc
#5 0xffffffff80ec4cab at trap+0x27b
#6 0xffffffff80ea98a1 at calltrap+0x8
#7 0xffffffff82d1d4ef at _nv017563rm+0x1f

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