[Bug 263929] panic: Assertion g_debugnet_pcb_inuse failed at /usr/src/sys/net/debugnet.c:608

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263929

            Bug ID: 263929
           Summary: panic: Assertion g_debugnet_pcb_inuse failed at
                    /usr/src/sys/net/debugnet.c:608
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@sysctl.cz

Hi,
i discovered kernel panic with work nedump in mode db> 

db> netdump 
netdump: need a destination server address
Usage: netdump -s <server> [-g <gateway> -c <localip> -i <interface>]
Error configuring netdump: 22
db> netdump -s 192.168.42.54 -c 192.168.42.123 -i dwc0
debugnet: overwriting mbuf zone pointers
debugnet_connect: interface 'dwc0' does not support debugnet
panic: Assertion g_debugnet_pcb_inuse failed at /usr/src/sys/net/debugnet.c:608
cpuid = 0
time = 1652304663
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x174
panic() at panic+0x44
debugnet_connect() at debugnet_connect+0x4a8
netdump_start() at netdump_start+0x128
dump_start() at dump_start+0xc8
cpu_minidumpsys() at cpu_minidumpsys+0x604
dumpsys_generic() at dumpsys_generic+0x64
doadump() at doadump+0x74
db_netdump_cmd() at db_netdump_cmd+0x12c
db_command() at db_command+0x368
db_command_loop() at db_command_loop+0x54
db_trap() at db_trap+0xf8
kdb_trap() at kdb_trap+0x1cc
handle_el1h_sync() at handle_el1h_sync+0x10
--- exception, esr 0xf2000000
kdb_enter() at kdb_enter+0x40
vpanic() at vpanic+0x1b0
panic() at panic+0x44
kdb_sysctl_panic() at kdb_sysctl_panic+0x68
sysctl_root_handler_locked() at sysctl_root_handler_locked+0xe0
sysctl_root() at sysctl_root+0x1ac
userland_sysctl() at userland_sysctl+0x140
sys___sysctl() at sys___sysctl+0x68
do_el0_sync() at do_el0_sync+0x524
handle_el0_sync() at handle_el0_sync+0x40
--- exception, esr 0x56000000

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