[Bug 232691] Fatal trap 12: page fault while in kernel mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232691

            Bug ID: 232691
           Summary: Fatal trap 12: page fault while in kernel mode
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: freebsd at sysctl.cz

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x40
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff828b8970
stack pointer           = 0x0:0xfffffe0233d7b630
frame pointer           = 0x0:0xfffffe0233d7b660
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         = 59062 (Xorg)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80b3d587 at kdb_backtrace+0x67
#1 0xffffffff80af6b27 at vpanic+0x177
#2 0xffffffff80af69a3 at panic+0x43
#3 0xffffffff80f77fdf at trap_fatal+0x35f
#4 0xffffffff80f78039 at trap_pfault+0x49
#5 0xffffffff80f77807 at trap+0x2c7
#6 0xffffffff80f57fbc at calltrap+0x8
#7 0xffffffff82836aff at i915_gem_evict_something+0xbf
#8 0xffffffff8283300e at i915_gem_object_pin+0x37e
#9 0xffffffff82830be9 at i915_gem_pager_populate+0x1a9
#10 0xffffffff80dea557 at vm_fault_hold+0x11f7
#11 0xffffffff80de9315 at vm_fault+0x75
#12 0xffffffff80f7813c at trap_pfault+0x14c
#13 0xffffffff80f77893 at trap+0x353
#14 0xffffffff80f57fbc at calltrap+0x8

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