panic: maddr rwlock 0xffff8000002a20b8: enter read deadlock
Starting stack trace...
panic(ffffffff83325ab2) at panic+0x1ba sys/kern/subr_prf.c:229
rw_do_enter_read(ffff8000002a20b8,0) at rw_do_enter_read+0x435 sys/kern/kern_rwlock.c:379
in_hasmulti(fffffd806ce066bc,ffff8000002a2058) at in_hasmulti+0x41 in_lookupmulti sys/netinet/in.c:-1 [inline]
in_hasmulti(fffffd806ce066bc,ffff8000002a2058) at in_hasmulti+0x41 sys/netinet/in.c:991
ip_output(fffffd806ce06600,fffffd807e9c6e00,0,0,ffff80002a876f58,0,91d715e318249c9d) at ip_output+0x9a9 sys/netinet/ip_output.c:302
igmp_sendpkt(ffff8000002a2058,ffff8000015cb900,16,0) at 
igmp_sendpkt+0x193
igmp_joingroup(ffff8000015cb900,ffff8000002a2058) at igmp_joingroup+0xd9 sys/netinet/igmp.c:561
in_addmulti(ffff80002a8770f0,ffff8000002a2058) at in_addmulti+0x315 sys/netinet/in.c:925
ip_setmoptions(c,fffffd807376f650,fffffd806ecbde00,0) at ip_setmoptions+0xdcb sys/netinet/ip_output.c:1602
sosetopt(ffff800001590f28,0,c,fffffd806ecbde00) at sosetopt+0x118 sys/kern/uipc_socket.c:-1
sys_setsockopt(ffff80002a7a5a08,ffff80002a8772e0,ffff80002a877230) at sys_setsockopt+0x2b9 sys/kern/uipc_syscalls.c:1227
syscall(ffff80002a8772e0) at syscall+0x962 mi_syscall sys/sys/syscall_mi.h:-1 [inline]
syscall(ffff80002a8772e0) at syscall+0x962 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xf7a767ec980, count: 245
End of stack trace.
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