https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250638

--- Comment #1 from Ed Maste <ema...@freebsd.org> ---
detaching virtual CD when in this state results in the following panic:

ugen0.6: <Linux 4.9.135 with astvhub Virtual Media Gadget 0> at usbus0
(disconnected)
umass1: at uhub3, port 1, addr 5 (disconnected)
pass2 at umass-sim1 bus 1 scbus2 target 0 lun 0
pass2: <GENERIC Virtual CDROM YS0J>  detached
cd0 at umass-sim1 bus 1 scbus2 target 0 lun 0
cd0: <GENERIC Virtual CDROM YS0J>  detached
panic: g_resize_provider_event but withered
cpuid = 7
time = 1603735205
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0233a2b420
vpanic() at vpanic+0x182/frame 0xfffffe0233a2b470
panic() at panic+0x43/frame 0xfffffe0233a2b4d0
g_resize_provider_event() at g_resize_provider_event+0x1a5/frame
0xfffffe0233a2b500
g_run_events() at g_run_events+0x156/frame 0xfffffe0233a2b530
g_fork_exit() at fork_exit+0x80/frame 0xfffffe0233a2b570
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0233a2b570
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 13 tid 100785 ]
Stopped at      kdb_enter+0x37: movq    $0,0x10a8f86(%rip)
db>

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