[Bug 209726] [panic]vm_radix_insert: key 33 is already present on MacBookPro 2015 with drm-4.6-next

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209726

            Bug ID: 209726
           Summary: [panic]vm_radix_insert: key 33 is already present on
                    MacBookPro 2015 with drm-4.6-next
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: huanghwh at gmail.com

Created attachment 170585
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=170585&action=edit
drm-4.6-next-panic.jpg

Hi,
I try to test drm-next-4.6 on my MacBookPro 15(2015),
kldload i915kms show:

[drm] Initialized drm 1.1.0 20060810
bus_register unimplemented!!!
drmn0: <drmn> on vgapci0
vgapci0: child drmn0 requested pci_enable_io
vgapci0: child drmn0 requested pci_enable_io
[drm] Found 128MB of eLLC
WARN_ON(domain->wake_count == 0)
[drm] Memory usable by graphics device = 2048M
[drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[drm] Driver supports precise vblank timestamp query.
[drm] Connector eDP-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.eDP-1
[drm]   - kern.vt.fb.default_mode
[drm] Connector DP-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.DP-1
[drm]   - kern.vt.fb.default_mode
[drm] Connector HDMI-A-1: get mode from tunables:
[drm]   - kern.vt.fb.modes.HDMI-A-1
[drm]   - kern.vt.fb.default_mode
[drm] Connector DP-2: get mode from tunables:
[drm]   - kern.vt.fb.modes.DP-2
[drm]   - kern.vt.fb.default_mode
[drm] Connector HDMI-A-2: get mode from tunables:
[drm]   - kern.vt.fb.modes.HDMI-A-2
[drm]   - kern.vt.fb.default_mode
[drm] Connector HDMI-A-3: get mode from tunables:
[drm]   - kern.vt.fb.modes.HDMI-A-3
[drm]   - kern.vt.fb.default_mode
[drm] Initialized i915 1.6.0 20160229 for drmn on minor 0
VT: Replacing driver "efifb" with new "fb".
start FB_INFO:
type=11 height=1800 width=2880 depth=32
cmsize=16 size=21196800
pbase=0x90000000 vbase=0xffffffff82210000
name=drmn0 flags=0x0 stride=11776 bpp=32
cmap[0]=0 cmap[1]=7f0000 cmap[2]=7f00 cmap[3]=c4a000
end FB_INFO
drmn0: fb0: inteldrmfb frame buffer device

But VT console looks like move to bottom right, I could not see the whole
screen.

The mate desktop can show, but quickly panic:

vm_radix_insert: key 33 is already present:

http://sw.gddsn.org.cn/freebsd/drm-4.6-next-panic.jpg

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