amdgpu crash

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

Got this trying to run X on a vega 10 laptop.

# crash -M netbsd.10.core -N netbsd.10
Crash version 10.99.7, image version 10.99.7.
crash: _kvm_kvatop(0)
Kernel compiled without options LOCKDEBUG.
System panicked: kernel diagnostic assertion "((mutex->wwm_state != WW_WANTOWN) || (mutex->wwm_u.ctx->wwx_owner != curlwp))" failed: file "../../../../external/bsd/drm2/linux/linux_ww_mutex.c", line 1023 locking 0xffff9221ca35fc60 against myself: 0xffff9221c4460600
Backtrace from time of crash is available.
crash> bt
__kernel_end() at 0
kern_reboot() at sys_reboot
vpanic() at vpanic+0x16d
kern_assert() at mitigation_v4_change_cpu.cold
linux_ww_mutex_trylock() at linux_ww_mutex_trylock+0x9b
linux_dma_resv_trylock() at linux_dma_resv_trylock+0x9
ttm_bo_release() at ttm_bo_release+0xeb
amdgpu_bo_unref() at amdgpu_bo_unref+0x1d
amdgpu_vm_free_table() at amdgpu_vm_free_table+0x5c
amdgpu_vm_free_pts() at amdgpu_vm_free_pts+0x9a
amdgpu_vm_bo_update_mapping() at amdgpu_vm_bo_update_mapping+0x615
amdgpu_vm_clear_freed() at amdgpu_vm_clear_freed+0xea
amdgpu_gem_va_ioctl() at amdgpu_gem_va_ioctl+0x3ec
drm_ioctl() at drm_ioctl+0x214
drm_ioctl_shim() at drm_ioctl_shim+0x2e
sys_ioctl() at sys_ioctl+0x555
syscall() at syscall+0x18c
--- syscall (number 54) ---
syscall+0x18c: