[Bug 267204] graphics/drm-510-kmod 5.10.113_7 i915kms kernel page fault

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267204

--- Comment #1 from Christian Weisgerber <naddy@FreeBSD.org> ---
I tried reverting the rb_tree commits from 2022-10-12, which should be all
rb_tree changes from the two week window when the problem must have been
introduced.  The page fault still happens, but the backtrace looks different:

#0 0xffffffff80c50575 at kdb_backtrace+0x65
#1 0xffffffff80c03351 at vpanic+0x151
#2 0xffffffff80c031f3 at panic+0x43
#3 0xffffffff810a4d87 at trap_fatal+0x387
#4 0xffffffff810a4ddf at trap_pfault+0x4f
#5 0xffffffff8107c678 at calltrap+0x8
#6 0xffffffff82dc871b at add_hole+0xbb
#7 0xffffffff82dc8d81 at drm_mm_insert_node_in_range+0x591
#8 0xffffffff82c1a5b9 at i915_gem_gtt_insert+0xd9
#9 0xffffffff82c2fc30 at i915_vma_insert+0x1e0
#10 0xffffffff82c2f7ec at i915_vma_pin_ww+0x59c
#11 0xffffffff82c2fcd1 at i915_ggtt_pin+0x51
#12 0xffffffff82cfe647 at __intel_context_do_pin_ww+0x3a7
#13 0xffffffff82d36a68 at eb_pin_engine+0x1c8
#14 0xffffffff82d35c63 at eb_relocate_parse+0x63
#15 0xffffffff82d34968 at i915_gem_do_execbuffer+0x6b8
#16 0xffffffff82d34e02 at i915_gem_execbuffer2_ioctl+0x1a2
#17 0xffffffff82dc6e3a at drm_ioctl_kernel+0xca

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