Daily black screen of death

FYI,

I'm experiencing an almost daily black screen of death panic.
Kernel, world, drm-current-kmod, and gpu-firmware-kmod were
all rebuilt and installed at the same time.  Uname shows

FreeBSD 14.0-CURRENT #0 main-n254360-eb9d205fa69: Tue Apr 5 13:49:47 PDT 2022

So, April 5th sources.

The panic results in a keyboard lock and no dump.  The system
does not have a serial console.  Only recourse is a hard rest.

Hand transcribed from photo

_sleep() at _sleep+0x38a/frame 0xfffffe012b7c0680
buf_daemon_shutdown() at buf_daemon_shutdown+0x6b/frame 0xfffffe012b7c06a0
kern_reboot() at kern_reboot+0x2ae/frame 0xfffffe012b7c06e0
vpanic() at vpanic+0x1ee/frame 0xfffffe012b7c0730
panic() at panic+0x43/frame 0xfffffe012b7c0790

Above repeats 100s of time scrolling off the screen with ever
increasing frame pointer.

Final message,

mi_switch() at mi_switch+0x18e/frame 0xfffffe012b7c14b0
__mtx_lock_sleep() at __mtx_lock_sleep+0x173/frame 0xfffffe012b7c1510
__mtx_lock_flags() at __mtx_lock_flags+0xc0/frame 0xfffffe012b7c1550
linux_wake_up() at linux_wake_up+0x38/frame 0xfffffe012b7c15a0
radeon_fence_is_signaled() at radeon_fence_is_signaled+0x99/frame 0xfffffe012b7c15f0
dma_resv_add_shared_fence() at dma_resv_add_shared_fence+0x99/frame 0xfffffe012b7c1640
ttm_eu_fence_buffer_objects() at ttm_eu_fence_buffer_objects+0x79/frame 0xfffffe012b7c1680
radeon_cs_parser_fini() at radeon_cs_parser_fini+0x53/frame 0xfffffe012b7c16b0
radeaon_cs_ioctl() at radeaon_cs_ioctl+0x75e/frame 0xfffffe012b7c1b30
drm_ioctl_kernel() at drm_ioctl_kernel+0xc7/frame 0xfffffe012b7c1b80
drm_ioctl() at drm_ioctl+0x2c3/frame 0xfffffe012b7c1c70
linux_file_ioctl() at linux_file_ioctl+0x309/frame 0xfffffe012b7c1cd0
kern_ioctl() at kern_ioctl+0x1dc/frame 0xfffffe012b7c1d40
sys_ioctl() at sys_ioctl+0x121/frame 0xfffffe012b7c1e10
amd64_syscall() at amd64_syscall+0x108/frame 0xfffffe012b7c1f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe012b7c1f30
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x36a096c34ea, rsp = 0x3fa11e623eb8, \
    rbp = 0x3fa11e623ee0 ---
panic: _sleep: curthread not running
cpuid = 4
time = 1650389478
KDB: stack backtrace:

One common trigger appears to be the use of firefox-99.0,2 from
the ports collection.  

-- 
Steve