uvm_fault(0xfffffd80753ae668, 0x4, 0, 1) -> e kernel: page fault trap, code=0 Stopped at igmp_leavegroup+0x80: movl 0x4(%rax),%r12d TID PID UID PRFLAGS PFLAGS CPU COMMAND igmp_leavegroup(ffff800000c521c0) at igmp_leavegroup+0x80 sys/netinet/igmp.c:521 in_delmulti(ffff800000c521c0) at in_delmulti+0xb7 sys/netinet/in.c:920 ip_freemoptions(ffff8000006c3ac0) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764 in_pcbdetach(fffffd806f3ba850) at in_pcbdetach+0xf3 sys/netinet/in_pcb.c:584 udp_detach(fffffd806e4be8d0) at udp_detach+0x3b sys/netinet/udp_usrreq.c:1263 soclose(fffffd806e4be8d0,0) at soclose+0x245 sys/kern/uipc_socket.c:361 soo_close(fffffd8075440d30,ffff800021676008) at soo_close+0x40 fdrop(fffffd8075440d30,ffff800021676008) at fdrop+0xc7 sys/kern/kern_descrip.c:1279 closef(fffffd8075440d30,ffff800021676008) at closef+0x117 sys/kern/kern_descrip.c:1263 fdfree(ffff800021676008) at fdfree+0xf3 sys/kern/kern_descrip.c:1195 exit1(ffff800021676008,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202 sys_exit(ffff800021676008,ffff80002e8670d0,ffff80002e867130) at sys_exit+0x16 sys/kern/kern_exit.c:95 syscall(ffff80002e8671a0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc36b0, 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(0xfffffd80753ae668, 0x4, 0, 1) -> e ddb> trace igmp_leavegroup(ffff800000c521c0) at igmp_leavegroup+0x80 sys/netinet/igmp.c:521 in_delmulti(ffff800000c521c0) at in_delmulti+0xb7 sys/netinet/in.c:920 ip_freemoptions(ffff8000006c3ac0) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764 in_pcbdetach(fffffd806f3ba850) at in_pcbdetach+0xf3 sys/netinet/in_pcb.c:584 udp_detach(fffffd806e4be8d0) at udp_detach+0x3b sys/netinet/udp_usrreq.c:1263 soclose(fffffd806e4be8d0,0) at soclose+0x245 sys/kern/uipc_socket.c:361 soo_close(fffffd8075440d30,ffff800021676008) at soo_close+0x40 fdrop(fffffd8075440d30,ffff800021676008) at fdrop+0xc7 sys/kern/kern_descrip.c:1279 closef(fffffd8075440d30,ffff800021676008) at closef+0x117 sys/kern/kern_descrip.c:1263 fdfree(ffff800021676008) at fdfree+0xf3 sys/kern/kern_descrip.c:1195 exit1(ffff800021676008,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202 sys_exit(ffff800021676008,ffff80002e8670d0,ffff80002e867130) at sys_exit+0x16 sys/kern/kern_exit.c:95 syscall(ffff80002e8671a0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc36b0, count: -14 ddb> show registers rdi 0 rsi 0 rbp 0xffff80002e866d50 rbx 0 rdx 0 rcx 0x1 rax 0 r8 0 r9 0 r10 0xf00ce353b4d1ba28 r11 0xc61e4040f9c88592 r12 0 r13 0x3 r14 0xffff8000006b5000 r15 0xffff800000c521c0 rip 0xffffffff81d64df0 igmp_leavegroup+0x80 cs 0x8 rflags 0x10246 __ALIGN_SIZE+0xf246 rsp 0xffff80002e866d20 ss 0x10 igmp_leavegroup+0x80: movl 0x4(%rax),%r12d ddb> show proc PROC (syz-executor.2) pid=523159 stat=onproc flags process=1008 proc=2000 pri=32, usrpri=83, nice=20 forw=0xffffffffffffffff, list=0xffff80002162c548,0xffff800021676fd8 process=0xffff800023ebc030 user=0xffff80002e862000, vmspace=0xfffffd80753ae668 estcpu=33, cpticks=0, pctcpu=0.7 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 95670 415834 5010 0 3 0x80 nanoslp syz-executor.3 95670 410631 5010 0 3 0x4000080 kqread syz-executor.3 95670 519277 5010 0 3 0x4000080 fsleep syz-executor.3 10878 248323 1 0 3 0x100083 ttyin getty 54293 8023 42982 0 3 0x82 piperd syz-executor.1 42052 426660 42982 0 3 0x82 piperd syz-executor.4 80600 44794 42982 0 3 0x82 piperd syz-executor.7 11536 97772 42982 0 3 0x82 piperd syz-executor.5 66621 85408 0 0 3 0x14280 nfsidl nfsio 99098 486433 0 0 3 0x14280 nfsidl nfsio 24165 280501 0 0 3 0x14280 nfsidl nfsio 29342 326326 0 0 3 0x14280 nfsidl nfsio 52417 97051 0 0 3 0x14280 nfsidl nfsio 92896 363184 0 0 3 0x14280 nfsidl nfsio 3873 424191 42982 0 3 0x82 piperd syz-executor.6 5010 84504 42982 0 3 0x82 nanoslp syz-executor.3 670 264487 42982 0 3 0x82 nanoslp syz-executor.2 67161 487454 42982 0 3 0x82 piperd syz-executor.0 69631 54185 0 0 3 0x14200 bored sosplice 42982 159182 76248 0 3 0x82 thrsleep syz-fuzzer 42982 423965 76248 0 3 0x4000082 thrsleep syz-fuzzer 42982 260238 76248 0 3 0x4000082 thrsleep syz-fuzzer 42982 397915 76248 0 3 0x4000082 thrsleep syz-fuzzer 42982 259835 76248 0 3 0x4000082 thrsleep syz-fuzzer 42982 335138 76248 0 3 0x4000082 kqread syz-fuzzer 42982 307851 76248 0 3 0x4000082 thrsleep syz-fuzzer 42982 300188 76248 0 3 0x4000082 thrsleep syz-fuzzer 42982 39325 76248 0 3 0x4000082 thrsleep syz-fuzzer 76248 500067 98563 0 3 0x10008a sigsusp ksh 98563 101702 47999 0 3 0x9a poll sshd 47999 184676 1 0 3 0x88 poll sshd 72711 327727 67713 73 3 0x100090 kqread syslogd 67713 248900 1 0 3 0x100082 netio syslogd 42225 501753 1 0 3 0x100080 kqread resolvd 47238 314487 82198 77 3 0x100092 kqread dhcpleased 26532 279004 82198 77 3 0x100092 kqread dhcpleased 82198 328217 1 0 3 0x80 kqread dhcpleased 50055 60000 0 0 3 0x14200 bored smr 68849 261247 0 0 3 0x14200 pgzero zerothread 60756 398011 0 0 3 0x14200 aiodoned aiodoned 17652 130589 0 0 3 0x14200 syncer update 68768 225129 0 0 3 0x14200 cleaner cleaner 7225 193104 0 0 3 0x14200 reaper reaper 83998 108189 0 0 3 0x14200 pgdaemon pagedaemon 94228 333894 0 0 3 0x14200 bored viomb 79822 43373 0 0 3 0x40014200 acpi0 acpi0 60517 471473 0 0 3 0x14200 bored softnet 70144 455243 0 0 3 0x14200 bored systqmp 94786 354958 0 0 3 0x14200 bored systq 18016 163748 0 0 3 0x40014200 bored softclock 62604 284126 0 0 3 0x40014200 idle0 1 424209 0 0 3 0x82 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 10193 6471K 6890K 78643K 16805 0 pcb 13 16K 17K 78643K 415 0 rtable 190 6K 7K 78643K 1001 0 ifaddr 80 17K 20K 78643K 410 0 sysctl 2 0K 0K 78643K 2 0 counters 27 17K 17K 78643K 93 0 ioctlops 0 0K 4K 78643K 3070 0 iov 0 0K 28K 78643K 750 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1401 88K 88K 78643K 3793 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 35 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 136 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 12 41K 81K 78643K 3889 0 sigio 0 0K 0K 78643K 14 0 proc 58 55K 71K 78643K 1017 0 subproc 104 6K 6K 78643K 312 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 2 0K 0K 78643K 1880 0 in_multi 73 5K 7K 78643K 1282 0 ether_multi 1 0K 0K 78643K 39 0 mrt 1 0K 0K 78643K 19 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 187 837K 837K 78643K 187 0 exec 0 0K 2K 78643K 1875 0 pfkey data 0 0K 1K 78643K 4 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 7 26K 26K 78643K 7 0 UVM amap 333 266K 803K 78643K 47728 0 UVM aobj 131 4K 4K 78643K 131 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 178 0 NDP 12 0K 2K 78643K 132 0 temp 131 4693K 6220K 78643K 29713 0 kqueue 11 16K 20K 78643K 173 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle rtpcb 120 305 0 302 5 4 1 3 0 8 0 rtentry 112 330 0 248 4 1 3 4 0 8 0 unpcb 136 2222 0 2209 23 20 3 6 0 8 2 syncache 296 19 0 19 6 6 0 1 0 8 0 tcpqe 32 33 0 33 3 3 0 1 0 8 0 tcpcb 736 1867 0 1861 94 74 20 20 0 8 18 arp 88 54 0 38 1 0 1 1 0 8 0 ipq 40 7 0 6 2 1 1 1 0 8 0 ipqe 40 19 0 18 2 1 1 1 0 8 0 inpcb 304 5419 0 5409 65 53 12 14 0 8 11 rttmr 72 2 0 2 1 1 0 1 0 8 0 nd6 48 85 0 67 1 0 1 1 0 8 0 pkpcb 40 15 0 15 4 3 1 1 0 8 1 kcovpl 48 24 0 16 1 0 1 1 0 8 0 ppxss 1152 35 0 35 5 5 0 1 0 8 0 pfrule 1360 114 0 79 3 0 3 3 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 1338 0 1020 33 9 24 32 0 8 0 art_table 32 1339 0 1020 5 0 5 5 0 8 0 art_node 16 326 0 253 1 0 1 1 0 8 0 sysvmsgpl 40 7 0 7 2 2 0 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 132 0 122 1 0 1 1 0 8 0 shmpl 112 128 0 0 4 0 4 4 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 6477 0 5024 92 0 92 92 0 8 0 ffsino 240 6477 0 5024 86 0 86 86 0 8 0 nchpl 144 11455 0 9843 62 0 62 62 0 8 0 uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0 vnodes 224 5926 0 0 349 0 349 349 0 8 0 namei 1024 42171 0 42171 3 2 1 2 0 8 1 vcpupl 1984 54 0 0 7 0 7 7 0 8 0 vmpool 528 57 0 3 4 0 4 4 0 8 0 scsiplug 72 10 0 10 2 2 0 1 0 8 0 scxspl 216 33221 0 33221 13 11 2 8 0 8 2 plimitpl 152 343 0 328 1 0 1 1 0 8 0 sigapl 424 4150 0 4107 7 1 6 6 0 8 0 futexpl 64 35921 0 35920 1 0 1 1 0 8 0 knotepl 112 2412 0 2336 3 0 3 3 0 8 0 kqueuepl 184 645 0 634 10 6 4 4 0 8 3 pipepl 304 706 0 678 17 14 3 8 0 8 0 fdescpl 432 4130 0 4107 4 0 4 4 0 8 0 filepl 120 28964 0 28724 47 35 12 15 0 8 3 lockfpl 104 621 0 619 2 1 1 2 0 8 0 lockfspl 48 204 0 202 1 0 1 1 0 8 0 sessionpl 144 41 0 25 1 0 1 1 0 8 0 pgrppl 48 44 0 28 1 0 1 1 0 8 0 ucredpl 96 3539 0 3529 1 0 1 1 0 8 0 zombiepl 144 4108 0 4107 2 1 1 1 0 8 0 processpl 1000 4150 0 4107 7 0 7 7 0 8 0 procpl 672 9590 0 9537 13 6 7 8 0 8 1 sosppl 168 29 0 29 6 5 1 1 0 8 1 sockpl 448 7961 0 7935 127 109 18 22 0 8 15 mcl64k 65536 190 0 190 6 5 1 1 0 8 1 mcl16k 16384 82 0 82 7 6 1 1 0 8 1 mcl12k 12288 126 0 126 6 5 1 1 0 8 1 mcl9k 9216 48 0 48 8 7 1 1 0 8 1 mcl8k 8192 283 0 283 6 5 1 1 0 8 1 mcl4k 4096 356 0 356 3 2 1 1 0 8 1 mcl2k2 2112 46 0 46 8 7 1 1 0 8 1 mcl2k 2048 84849 0 84770 24 11 13 13 0 8 0 mtagpl 96 1049 0 881 16 11 5 12 0 8 0 mbufpl 256 167299 0 166913 73 45 28 58 0 8 0 bufpl 288 10491 0 4082 458 0 458 458 0 8 0 anonpl 24 1141239 0 1117390 239 64 175 177 0 188 16 amapchunkpl 152 178416 0 177711 881 846 35 655 0 158 2 amappl16 200 14261 0 13293 100 35 65 65 0 8 7 amappl15 192 613 0 608 1 0 1 1 0 8 0 amappl14 184 249 0 245 1 0 1 1 0 8 0 amappl13 176 1021 0 1015 1 0 1 1 0 8 0 amappl12 168 468 0 464 1 0 1 1 0 8 0 amappl11 160 373 0 363 1 0 1 1 0 8 0 amappl10 152 540 0 533 1 0 1 1 0 8 0 amappl9 144 925 0 921 1 0 1 1 0 8 0 amappl8 136 1334 0 1254 3 0 3 3 0 8 0 amappl7 128 536 0 525 1 0 1 1 0 8 0 amappl6 120 719 0 697 2 1 1 2 0 8 0 amappl5 112 3397 0 3387 1 0 1 1 0 8 0 amappl4 104 1742 0 1712 2 1 1 2 0 8 0 amappl3 96 1297 0 1280 1 0 1 1 0 8 0 amappl2 88 2120 0 2065 3 1 2 3 0 8 0 amappl1 80 74873 0 74366 18 5 13 18 0 8 0 amappl 88 46918 0 46711 7 0 7 7 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 130 0 0 3 0 3 3 0 8 0 uaddrrnd 24 4187 0 4110 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 4187 0 4110 1 0 1 1 0 8 0 vmmpekpl 168 30726 0 30662 5 1 4 4 0 8 0 vmmpepl 168 384360 0 381734 223 79 144 157 0 357 10 vmsppl 272 4186 0 4110 8 2 6 6 0 8 0 rwobjpl 24 97448 0 89492 50 0 50 50 0 8 0 pdppl 4096 8380 0 8274 296 178 118 118 0 8 12 pvpl 32 1948796 0 1926230 372 143 229 242 0 265 29 pmappl 216 4186 0 4110 5 0 5 5 0 8 0 extentpl 40 58 0 38 1 0 1 1 0 8 0 phpool 112 1326 0 450 26 0 26 26 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace igmp_leavegroup(ffff800000c521c0) at igmp_leavegroup+0x80 sys/netinet/igmp.c:521 in_delmulti(ffff800000c521c0) at in_delmulti+0xb7 sys/netinet/in.c:920 ip_freemoptions(ffff8000006c3ac0) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764 in_pcbdetach(fffffd806f3ba850) at in_pcbdetach+0xf3 sys/netinet/in_pcb.c:584 udp_detach(fffffd806e4be8d0) at udp_detach+0x3b sys/netinet/udp_usrreq.c:1263 soclose(fffffd806e4be8d0,0) at soclose+0x245 sys/kern/uipc_socket.c:361 soo_close(fffffd8075440d30,ffff800021676008) at soo_close+0x40 fdrop(fffffd8075440d30,ffff800021676008) at fdrop+0xc7 sys/kern/kern_descrip.c:1279 closef(fffffd8075440d30,ffff800021676008) at closef+0x117 sys/kern/kern_descrip.c:1263 fdfree(ffff800021676008) at fdfree+0xf3 sys/kern/kern_descrip.c:1195 exit1(ffff800021676008,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202 sys_exit(ffff800021676008,ffff80002e8670d0,ffff80002e867130) at sys_exit+0x16 sys/kern/kern_exit.c:95 syscall(ffff80002e8671a0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc36b0, count: -14 ddb> machine ddbcpu 1 No such command ddb> trace igmp_leavegroup(ffff800000c521c0) at igmp_leavegroup+0x80 sys/netinet/igmp.c:521 in_delmulti(ffff800000c521c0) at in_delmulti+0xb7 sys/netinet/in.c:920 ip_freemoptions(ffff8000006c3ac0) at ip_freemoptions+0x4d sys/netinet/ip_output.c:1764 in_pcbdetach(fffffd806f3ba850) at in_pcbdetach+0xf3 sys/netinet/in_pcb.c:584 udp_detach(fffffd806e4be8d0) at udp_detach+0x3b sys/netinet/udp_usrreq.c:1263 soclose(fffffd806e4be8d0,0) at soclose+0x245 sys/kern/uipc_socket.c:361 soo_close(fffffd8075440d30,ffff800021676008) at soo_close+0x40 fdrop(fffffd8075440d30,ffff800021676008) at fdrop+0xc7 sys/kern/kern_descrip.c:1279 closef(fffffd8075440d30,ffff800021676008) at closef+0x117 sys/kern/kern_descrip.c:1263 fdfree(ffff800021676008) at fdfree+0xf3 sys/kern/kern_descrip.c:1195 exit1(ffff800021676008,0,0,1) at exit1+0x35d sys/kern/kern_exit.c:202 sys_exit(ffff800021676008,ffff80002e8670d0,ffff80002e867130) at sys_exit+0x16 sys/kern/kern_exit.c:95 syscall(ffff80002e8671a0) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffc36b0, count: -14