Crash version 8.99.23, image version 8.99.23.
System panicked: LOCKDEBUG: Mutex error: mutex_vector_enter,476: locking against myself
Backtrace from time of crash is available.
crash> bt
_KERNEL_OPT_NVGA_RASTERCONSOLE() at 0
_KERNEL_OPT_SVS() at _KERNEL_OPT_SVS
vpanic() at vpanic+0x178
snprintf() at snprintf
lockdebug_more() at lockdebug_more
mutex_enter() at mutex_enter+0x613
scsipi_done() at scsipi_done+0x26
scsi_kill_pending() at scsi_kill_pending+0x5c
scsipi_kill_pending() at scsipi_kill_pending+0x34
cddetach() at cddetach+0xf9
config_detach() at config_detach+0x121
scsipi_target_detach() at scsipi_target_detach+0x106
scsibusdetach() at scsibusdetach+0x2e
config_detach() at config_detach+0x121
umass_detach() at umass_detach+0xa7
config_detach() at config_detach+0x121
usb_disconnect_port() at usb_disconnect_port+0x192
uhub_explore() at uhub_explore+0x221
usb_discover() at usb_discover+0x8c
usb_event_thread() at usb_event_thread+0x24e