random 11.1 boot panic

[Daniel Braniss]

this has been happening randomly for some time now,
…
cd0: Attempt to query device size failed: NOT READY, Medium not present - tray ]
Stopped at      vga_bitblt_one_text_pixels_block+0x13e: movl    (%rax,%r13,4),%d
db> bt
Tracing pid 4 tid 100042 td 0xfffff8000a4f2620
vga_bitblt_one_text_pixels_block() at vga_bitblt_one_text_pixels_block+0x13e/fr0
vga_bitblt_text() at vga_bitblt_text+0xc0/frame 0xfffffe05d950f160
vt_flush() at vt_flush+0x38f/frame 0xfffffe05d950f1b0
termcn_cnputc() at termcn_cnputc+0xbe/frame 0xfffffe05d950f1e0
cnputc() at cnputc+0x181/frame 0xfffffe05d950f210
cnputs() at cnputs+0x78/frame 0xfffffe05d950f230
putchar() at putchar+0x14d/frame 0xfffffe05d950f2b0
kvprintf() at kvprintf+0x113d/frame 0xfffffe05d950f3b0
vprintf() at vprintf+0x84/frame 0xfffffe05d950f500
printf() at printf+0x43/frame 0xfffffe05d950f560
cddone() at cddone+0x210/frame 0xfffffe05d950fb20
xpt_done_process() at xpt_done_process+0x697/frame 0xfffffe05d950fb60
xpt_done_td() at xpt_done_td+0x196/frame 0xfffffe05d950fbb0
fork_exit() at fork_exit+0x82/frame 0xfffffe05d950fbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe05d950fbf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
db>

danny