--- Comment #4 from Dmitry Chagin <> ---
yet another panic, when removing rsu:

rsu0: <vendor 0x0b05 product 0x1786, class 0/0, rev 2.00/2.00, addr 3> on
rsu0: MAC/BB RTL8712 cut 3
wlan1: Ethernet address: 50:46:5d:76:ef:15
ugen2.3: <vendor 0x0b05> at usbus2 (disconnected)
rsu0: at uhub3, port 3, addr 3 (disconnected)
Kernel page fault with the following non-sleepable locks held:
exclusive sleep mutex rsu0 (network driver) r = 0 (0xfffffe0002c330a0) locked @
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe033d2292e0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe033d229390
witness_warn() at witness_warn+0x4b5/frame 0xfffffe033d229450
trap_pfault() at trap_pfault+0x59/frame 0xfffffe033d2294f0
trap() at trap+0x752/frame 0xfffffe033d229840
calltrap() at calltrap+0x8/frame 0xfffffe033d229840
--- trap 0xc, rip = 0xffffffff804358fe, rsp = 0xfffffe033d229900, rbp =
0xfffffe033d229980 ---
rsu_init_locked() at rsu_init_locked+0x19ce/frame 0xfffffe033d229980
rsu_ioctl() at rsu_ioctl+0xa6/frame 0xfffffe033d2299b0
taskqueue_run_locked() at taskqueue_run_locked+0xf0/frame 0xfffffe033d229a10
taskqueue_thread_loop() at taskqueue_thread_loop+0x9b/frame 0xfffffe033d229a40
fork_exit() at fork_exit+0xd9/frame 0xfffffe033d229ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe033d229ab0
--- trap 0, rip = 0, rsp = 0xfffffe033d229b70, rbp = 0 ---

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address    = 0x0
fault code        = supervisor read data, page not present
instruction pointer    = 0x20:0xffffffff804358fe
stack pointer            = 0x28:0xfffffe033d229900
frame pointer            = 0x28:0xfffffe033d229980
code segment        = base 0x0, limit 0xfffff, type 0x1b
            = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags    = interrupt enabled, resume, IOPL = 0
current process        = 0 (rsu0 net80211 taskq)

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