uvm_fault(0xfffffd80074a6158, 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(ffff800000dcbe00,ffff8000006ab000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000dcbe00) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006ba790) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd806ed65168) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(fffffd806e5f4948) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(fffffd806e5f4948,0) at soclose+0x80 pru_detach sys/sys/protosw.h:283 [inline] soclose(fffffd806e5f4948,0) at soclose+0x80 sys/kern/uipc_socket.c:411 soo_close(fffffd807251a350,ffff80002a5d71f8) at soo_close+0x44 fdrop(fffffd807251a350,ffff80002a5d71f8) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd807251a350,ffff80002a5d71f8) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a5d71f8) at fdfree+0xe3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a5d71f8,0,0,1) at exit1+0x371 sys/kern/kern_exit.c:199 sys_exit(ffff80002a5d71f8,ffff80002a6650e0,ffff80002a665030) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a6650e0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f5796969dd0, count: 1 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic *cpu0: uvm_fault(0xfffffd80074a6158, 0x4, 0, 1) -> e ddb> trace igmp_leavegroup(ffff800000dcbe00,ffff8000006ab000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000dcbe00) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006ba790) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd806ed65168) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(fffffd806e5f4948) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(fffffd806e5f4948,0) at soclose+0x80 pru_detach sys/sys/protosw.h:283 [inline] soclose(fffffd806e5f4948,0) at soclose+0x80 sys/kern/uipc_socket.c:411 soo_close(fffffd807251a350,ffff80002a5d71f8) at soo_close+0x44 fdrop(fffffd807251a350,ffff80002a5d71f8) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd807251a350,ffff80002a5d71f8) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a5d71f8) at fdfree+0xe3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a5d71f8,0,0,1) at exit1+0x371 sys/kern/kern_exit.c:199 sys_exit(ffff80002a5d71f8,ffff80002a6650e0,ffff80002a665030) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a6650e0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f5796969dd0, count: -14 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002a664c80 rbx 0x3 rdx 0 rcx 0x1 rax 0 r8 0x90 r9 0x1 r10 0x9ef3a67c3d6258f9 r11 0xd1c026ab436aaa58 r12 0 r13 0x3 r14 0xffff800000dcbe00 r15 0xffff8000006ab000 rip 0xffffffff8212401f igmp_leavegroup+0xaf cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002a664c50 ss 0x10 igmp_leavegroup+0xaf: movl 0x4(%rax),%r12d ddb> show proc PROC (syz-executor3315967969) tid=99242 pid=92189 tcnt=1 stat=onproc flags process=8000008 proc=2000 runpri=51, usrpri=51, slppri=24, nice=20 wchan=0x0, wmesg=, ps_single=0x0 forw=0xffffffffffffffff, list=0xffff80002a5d6f68,0xffffffff82d9cde0 process=0xffff8000ffff6e20 user=0xffff80002a660000, vmspace=0xfffffd80074a6158 estcpu=1, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 79311 228595 28555 0 3 0x8000082 nanoslp syz-executor3315967969 28555 345265 44603 0 3 0x810008a sigsusp ksh 44603 462161 80234 0 3 0x1800009a kqread sshd 64025 473238 1 0 3 0x18100083 ttyin getty 80234 163259 1 0 3 0x18000088 kqread sshd 80326 431857 99520 73 3 0x19100090 kqread syslogd 99520 413985 1 0 3 0x18100082 sbwait syslogd 91323 230560 1 0 3 0x18100080 kqread resolvd 3039 338423 48347 77 3 0x18100092 kqread dhcpleased 23154 137822 48347 77 3 0x18100092 kqread dhcpleased 48347 393370 1 0 3 0x18000080 kqread dhcpleased 25344 469061 0 0 3 0x14200 bored smr 94621 30141 0 0 2 0x14200 zerothread 35860 162655 0 0 3 0x14200 aiodoned aiodoned 99344 270525 0 0 3 0x14200 syncer update 74942 463036 0 0 3 0x14200 cleaner cleaner 17363 160214 0 0 3 0x14200 reaper reaper 54375 41460 0 0 3 0x14200 pgdaemon pagedaemon 3953 40450 0 0 3 0x14200 bored viomb 36774 152891 0 0 3 0x40014200 acpi0 acpi0 12615 119697 0 0 3 0x14200 bored softnet3 42500 74475 0 0 3 0x14200 bored softnet2 72144 87449 0 0 3 0x14200 bored softnet1 22866 352107 0 0 3 0x14200 bored softnet0 68329 503570 0 0 3 0x14200 bored systqmp 76706 189639 0 0 3 0x14200 bored systq 10716 115604 0 0 3 0x40014200 tmoslp softclock 19542 418354 0 0 3 0x40014200 idle0 1 122511 0 0 3 0x8000082 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10131 6381K 6412K 166960K 11209 0 pcb 15 10K 10K 166960K 15 0 rtable 58 1K 2K 166960K 110 0 pf 12 6K 6K 166960K 12 0 ifaddr 11 5K 5K 166960K 11 0 ifgroup 17 1K 1K 166960K 17 0 counters 22 16K 16K 166960K 22 0 ioctlops 0 0K 2K 166960K 21 0 mount 1 1K 1K 166960K 1 0 log 0 0K 0K 166960K 4 0 vnodes 1259 79K 79K 166960K 1275 0 UFS quota 1 32K 32K 166960K 1 0 UFS mount 5 36K 36K 166960K 5 0 shm 2 1K 1K 166960K 2 0 VM map 2 1K 1K 166960K 2 0 sem 2 0K 0K 166960K 2 0 dirhash 12 2K 2K 166960K 12 0 ACPI 1697 195K 286K 166960K 12548 0 file desc 1 0K 0K 166960K 1 0 proc 55 58K 59K 166960K 246 0 NFS srvsock 1 0K 0K 166960K 1 0 NFS daemon 1 16K 16K 166960K 1 0 ip_moptions 2 0K 0K 166960K 2 0 in_multi 12 0K 0K 166960K 12 0 ether_multi 1 0K 0K 166960K 1 0 ISOFS mount 1 32K 32K 166960K 1 0 MSDOSFS mount 1 16K 16K 166960K 1 0 ttys 25 122K 122K 166960K 25 0 exec 0 0K 1K 166960K 243 0 tdb 3 0K 0K 166960K 3 0 VM swap 8 62K 64K 166960K 10 0 UVM amap 96 4K 6K 166960K 2242 0 UVM aobj 3 2K 2K 166960K 3 0 pinsyscall 22 44K 48K 166960K 840 0 memdesc 1 4K 4K 166960K 1 0 crypto data 1 1K 1K 166960K 1 0 NDP 3 0K 0K 166960K 3 0 temp 1 6788K 6852K 166960K 2789 0 kqueue 11 16K 18K 166960K 24 0 SYN cache 2 16K 16K 166960K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 20 0 17 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 144 34 0 20 1 0 1 1 0 8 0 syncache 336 5 0 5 1 0 1 1 0 8 1 tcpqe 32 209 0 209 1 0 1 1 0 8 1 tcpcb 808 8 0 5 1 0 1 1 0 8 0 arp 88 2 0 0 1 0 1 1 0 8 0 inpcb 360 28 0 20 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1502 0 40 92 0 92 92 0 8 0 ffsino 240 1502 0 40 86 0 86 86 0 8 0 nchpl 144 1686 0 47 61 0 61 61 0 8 0 uvmvnodes 80 1511 0 0 31 0 31 31 0 8 0 vnodes 216 1511 0 0 84 0 84 84 0 8 0 namei 1024 4341 0 4341 1 0 1 1 0 8 1 kstatmem 264 6 0 0 1 0 1 1 0 8 0 scxspl 216 5155 0 5155 2 0 2 2 1 8 2 plimitpl 152 16 0 10 1 0 1 1 0 8 0 sigapl 424 309 0 279 4 0 4 4 0 8 0 knotepl 120 3657 0 3628 2 0 2 2 0 8 1 kqueuepl 184 21 0 13 1 0 1 1 0 8 0 pipepl 288 87 0 84 1 0 1 1 0 8 0 fdescpl 432 293 0 279 2 0 2 2 0 8 0 filepl 120 1134 0 1077 2 0 2 2 0 8 0 lockfpl 104 6 0 4 1 0 1 1 0 8 0 lockfspl 48 4 0 2 1 0 1 1 0 8 0 sessionpl 144 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 104 66 0 56 1 0 1 1 0 8 0 zombiepl 144 280 0 279 1 0 1 1 0 8 0 processpl 1072 309 0 279 3 0 3 3 0 8 0 procpl 656 309 0 279 3 0 3 3 0 8 0 sockpl 472 82 0 57 4 0 4 4 0 8 0 mcl8k 8192 4 0 4 1 0 1 1 0 8 1 mcl4k 4096 10 0 10 1 0 1 1 0 8 1 mcl2k 2048 12334 0 12291 31 17 14 31 0 8 8 mtagpl 96 4 0 4 1 0 1 1 0 8 1 mbufpl 256 19845 0 19797 16 4 12 16 0 8 7 bufpl 280 2510 0 95 173 0 173 173 0 8 0 anonpl 24 184012 0 182235 23 0 23 23 0 188 11 amapchunkpl 152 8474 0 8342 7 0 7 7 0 158 1 amappl16 200 5344 0 5344 5 0 5 5 0 8 5 amappl15 192 11 0 11 1 0 1 1 0 8 1 amappl14 184 116 0 107 1 0 1 1 0 8 0 amappl13 176 10 0 10 1 0 1 1 0 8 1 amappl12 168 805 0 793 1 0 1 1 0 8 0 amappl11 160 84 0 74 1 0 1 1 0 8 0 amappl10 152 13 0 13 1 0 1 1 0 8 1 amappl9 144 157 0 157 1 0 1 1 0 8 1 amappl8 136 41 0 39 1 0 1 1 0 8 0 amappl7 128 15 0 14 1 0 1 1 0 8 0 amappl6 120 169 0 159 1 0 1 1 0 8 0 amappl5 112 119 0 107 1 0 1 1 0 8 0 amappl4 104 403 0 374 1 0 1 1 0 8 0 amappl3 96 2309 0 2285 1 0 1 1 0 8 0 amappl2 88 581 0 528 2 0 2 2 0 8 0 amappl1 80 8793 0 8392 10 0 10 10 0 8 1 amappl 88 1940 0 1890 2 0 2 2 0 92 0 dma4096 4096 1 0 1 1 0 1 1 0 8 1 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 0 1 1 0 8 1 dma128 128 253 0 253 1 0 1 1 0 8 1 dma64 64 6 0 6 1 0 1 1 0 8 1 dma32 32 7 0 7 1 0 1 1 0 8 1 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 2 0 0 1 0 1 1 0 8 0 uaddrrnd 24 293 0 279 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 293 0 279 1 0 1 1 0 8 0 vmmpekpl 168 5527 0 5511 1 0 1 1 0 8 0 vmmpepl 168 34636 0 33730 46 0 46 46 0 357 2 vmsppl 344 292 0 279 2 0 2 2 0 8 0 rwobjpl 24 19049 0 16941 14 0 14 14 0 8 1 pdppl 4096 592 0 558 48 14 34 40 0 8 0 pvpl 32 276129 0 272017 52 0 52 52 0 265 15 pmappl 216 292 0 279 1 0 1 1 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 292 0 35 9 0 9 9 0 8 1 ddb> machine ddbcpu 0 No such command ddb> trace igmp_leavegroup(ffff800000dcbe00,ffff8000006ab000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000dcbe00) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006ba790) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd806ed65168) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(fffffd806e5f4948) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(fffffd806e5f4948,0) at soclose+0x80 pru_detach sys/sys/protosw.h:283 [inline] soclose(fffffd806e5f4948,0) at soclose+0x80 sys/kern/uipc_socket.c:411 soo_close(fffffd807251a350,ffff80002a5d71f8) at soo_close+0x44 fdrop(fffffd807251a350,ffff80002a5d71f8) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd807251a350,ffff80002a5d71f8) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a5d71f8) at fdfree+0xe3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a5d71f8,0,0,1) at exit1+0x371 sys/kern/kern_exit.c:199 sys_exit(ffff80002a5d71f8,ffff80002a6650e0,ffff80002a665030) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a6650e0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f5796969dd0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace igmp_leavegroup(ffff800000dcbe00,ffff8000006ab000) at igmp_leavegroup+0xaf sys/netinet/igmp.c:512 in_delmulti(ffff800000dcbe00) at in_delmulti+0xd3 sys/netinet/in.c:908 ip_freemoptions(ffff8000006ba790) at ip_freemoptions+0x5d sys/netinet/ip_output.c:1737 in_pcbdetach(fffffd806ed65168) at in_pcbdetach+0x97 sys/netinet/in_pcb.c:606 udp_detach(fffffd806e5f4948) at udp_detach+0x3f sys/netinet/udp_usrreq.c:1139 soclose(fffffd806e5f4948,0) at soclose+0x80 pru_detach sys/sys/protosw.h:283 [inline] soclose(fffffd806e5f4948,0) at soclose+0x80 sys/kern/uipc_socket.c:411 soo_close(fffffd807251a350,ffff80002a5d71f8) at soo_close+0x44 fdrop(fffffd807251a350,ffff80002a5d71f8) at fdrop+0xd5 sys/kern/kern_descrip.c:1274 closef(fffffd807251a350,ffff80002a5d71f8) at closef+0x11b sys/kern/kern_descrip.c:1258 fdfree(ffff80002a5d71f8) at fdfree+0xe3 sys/kern/kern_descrip.c:1190 exit1(ffff80002a5d71f8,0,0,1) at exit1+0x371 sys/kern/kern_exit.c:199 sys_exit(ffff80002a5d71f8,ffff80002a6650e0,ffff80002a665030) at sys_exit+0x1a sys/kern/kern_exit.c:89 syscall(ffff80002a6650e0) at syscall+0x72a sys/arch/amd64/amd64/trap.c:577 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f5796969dd0, count: -14