uvm_fault(0xfffffd8069d595b0, 0x4, 0, 1) -> e
kernel: page fault trap, code=0
Stopped at      igmp_leavegroup+0xaf:   movl    0x4(%rax),%r12d
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
igmp_leavegroup(ffff800000d077c0,ffff8000006b7000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512
in_delmulti(ffff800000d077c0) at in_delmulti+0xd8 sys/netinet/in.c:908
ip_freemoptions(ffff800000de2840) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1770
in_pcbdetach(fffffd8067e97bd8) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:591
udp_detach(fffffd8060b26d68) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1113
soclose(fffffd8060b26d68,0) at soclose+0x253 pru_detach sys/sys/protosw.h:281 [inline]
soclose(fffffd8060b26d68,0) at soclose+0x253 sys/kern/uipc_socket.c:397
soo_close(fffffd807325f6a8,ffff8000217045a0) at soo_close+0x44
fdrop(fffffd807325f6a8,ffff8000217045a0) at fdrop+0xcb sys/kern/kern_descrip.c:1274
closef(fffffd807325f6a8,ffff8000217045a0) at closef+0x11b sys/kern/kern_descrip.c:1258
fdfree(ffff8000217045a0) at fdfree+0xf3 sys/kern/kern_descrip.c:1190
exit1(ffff8000217045a0,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:197
sys_exit(ffff8000217045a0,ffff80002e86d9a0,ffff80002e86d9f0) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff80002e86da70) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:632
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x78aa836547c0, count: 1
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