panic: memory chunk 0xfffff8008d801580 is already free!
cpuid = 4
Trace beginning at frame 0xfffff801180a9768
chunk_mark_free() at chunk_mark_free+0xae 0xffffffff80655dbe 
chunk_mark_free() at chunk_mark_free+0xae 0xffffffff80655dbe 
_kfree() at _kfree+0x262 0xffffffff806580e2 
acpi_video_vo_destroy() at acpi_video_vo_destroy+0x6a 0xffffffff826001ca 
acpi_video_detach() at acpi_video_detach+0x79 0xffffffff82600b39 
device_detach() at device_detach+0x74 0xffffffff8068e5a4 
Debugger("panic")

CPU4 stopping CPUs: 0x0000002f
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>