[Bug 253331] reproducible crash with graphics/drm-fbsd13-kmod

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253331

--- Comment #6 from George Michaelson <[email protected]> ---
(In reply to Greg V from comment #5)

git clone-d the drm-kmod, placed it into the work/ path for drm-fbsd13 removed
the .install type files, make/make install.

I did not enable the intel device in xorg.conf, solely the "radeon" driven
card.

This is the crash now:

Fatal trap 9: general protection fault while in kernel mode
cpuid = 0; apic id = 00
instruction pointer     = 0x20:0xffffffff80bf3c54
stack pointer           = 0x0:0xfffffe00d0ee1730
frame pointer           = 0x0:0xfffffe00d0ee1730
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         = 1207 (Xorg)
trap number             = 9
WARNING !drm_modeset_is_locked(&crtc->mutex) failed at
/usr/ports/graphics/drm-fbsd13-kmod/work/drm-kmod-drm_v5.4.92_2/drivers/gpu/drm/drm_atomic_helper.c:621
#0 0xffffffff82a50683 at linux_dump_stack+0x23
#1 0xffffffff829cf3c3 at drm_atomic_helper_check_modeset+0xb3
#2 0xffffffff82ad899d at intel_atomic_check+0x8d
#3 0xffffffff829ce360 at drm_atomic_check_only+0x400
#4 0xffffffff829ce793 at drm_atomic_commit+0x13
#5 0xffffffff829db3b8 at drm_client_modeset_commit_atomic+0x148
#6 0xffffffff829db119 at drm_client_modeset_commit_force+0x69
#7 0xffffffff82a1b42a at drm_fb_helper_restore_fbdev_mode_unlocked+0x7a
#8 0xffffffff82a153f7 at vt_kms_postswitch+0x167
#9 0xffffffff80a54d0b at vt_window_switch+0x12b
#10 0xffffffff80a51e1f at vtterm_cngrab+0x4f
#11 0xffffffff80b93866 at cngrab+0x16
#12 0xffffffff80bf8e4c at vpanic+0xec

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