Kernel boots failed after Sept 12 (main-n289064-0d022baa047a)

I have been unable to build a kernel that would boot to multi-user since
almost a week ago. It looks like it is tied to lkpi:
drmn0: successfully loaded firmware image 'i915/adlp_dmc.bin'
drmn0: [drm] Finished loading DMC firmware i915/adlp_dmc.bin (v2.20)
drmn0: [drm] [ENCODER:244:DDI B/PHY B] unusable PPS, disabling eDP
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex lkpi-priv-dma (lkpi-priv-dma) r = 0
(0xfffff800080b2f20) locked @
/usr/src/sys/compat/linuxkpi/common/src/linux_pci.c:2117
stack backtrace:
#0 0xffffffff80cce50c at witness_debugger+0x6c
#1 0xffffffff80ccfe0c at witness_warn+0x4bc
#2 0xffffffff811eb9c7 at trap_pfault+0x97
#3 0xffffffff811b8ea8 at calltrap+0x8
#4 0xffffffff8360927c at i915_gem_gtt_prepare_pages+0x3c
#5 0xffffffff8378c281 at shmem_get_pages+0xe1
#6 0xffffffff837895e8 at __i915_gem_object_get_pages+0x38
#7 0xffffffff8361697a at i915_vma_pin_ww+0x11a
#8 0xffffffff836173e6 at __i915_ggtt_pin+0x76
#9 0xffffffff837257f4 at __intel_context_do_pin_ww+0x474
#10 0xffffffff83725b6b at __intel_context_do_pin+0x3b
#11 0xffffffff83727d0f at intel_engine_create_pinned_context+0xef
#12 0xffffffff837284ed at intel_engines_init+0x5ed
#13 0xffffffff83735cfe at intel_gt_init+0x17e
#14 0xffffffff83607bdd at i915_gem_init+0x26d
#15 0xffffffff83603ded at i915_driver_probe+0x8ed
#16 0xffffffff80f3843b at linux_pci_attach_device+0x55b
#17 0xffffffff80c92606 at device_attach+0x466

System is an AlderLake 2th Gen Intel(R) Core(TM) i5-1235U (2496.00-MHz
K8-class CPU)

While I can provide a core.txt file, to my inexperienced eyes, it looks
corrupted.

Kernel build cleanly, but several builds over the past 6 days have all
failed.

Any clues would be appreciated.
-- 
Kevin Oberman, Part time kid herder and retired Network Engineer
E-mail: rkoberman@gmail.com