panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 94194 24731 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224ab8e) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8059c37a00,38,8,fffffd8058b66c20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8059c37a00,38,8,fffffd8058b66c20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8059c37a00,38,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e56c690,fffffd8059c37a00,ffff80001e455b30) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e455d88,ffff80001e455d94,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e455d88,ffff80001e455d94,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e455d88,ffff80001e455d94,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8059c37a00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8059c37a00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8059c37500,ffff800000a04b00,fffffd805e56c4d0,0,0,fffffd805e56c460) at ip6_output+0xd02 rip6_output(fffffd8059c37800,fffffd8063da44c0,ffff80001e4560f0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8063da44c0,9,fffffd8059c37800,0,0,ffff80001d35d768) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8063da44c0,0,ffff80001e456338,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001e456320, count: 0 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 m_copydata: null mbuf ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224ab8e) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8059c37a00,38,8,fffffd8058b66c20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8059c37a00,38,8,fffffd8058b66c20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8059c37a00,38,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e56c690,fffffd8059c37a00,ffff80001e455b30) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e455d88,ffff80001e455d94,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e455d88,ffff80001e455d94,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e455d88,ffff80001e455d94,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8059c37a00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8059c37a00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8059c37500,ffff800000a04b00,fffffd805e56c4d0,0,0,fffffd805e56c460) at ip6_output+0xd02 rip6_output(fffffd8059c37800,fffffd8063da44c0,ffff80001e4560f0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8063da44c0,9,fffffd8059c37800,0,0,ffff80001d35d768) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8063da44c0,0,ffff80001e456338,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d35d768,5,ffff80001e456338,0,ffff80001e456420) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d35d768,ffff80001e4563d8,ffff80001e456420) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e4564a0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x95d3d1968d0, count: -18 ddb> show registers rdi 0xffffffff81878a47 db_enter+0x17 rsi 0x126e __ALIGN_SIZE+0x26e rbp 0xffff80001e4558a0 rbx 0xffff80001e455950 rdx 0x126f __ALIGN_SIZE+0x26f rcx 0xffff80001f633000 rax 0xffff80001f633000 r8 0xffff80001e455860 r9 0x1 r10 0xffff8000009f7140 r11 0x5dbf149dcaf72801 r12 0x3000000008 r13 0xffff80001e4558b0 r14 0x100 r15 0x1 rip 0xffffffff81878a48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e455890 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=94194 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff80001d35ed58,0xffffffff8256d750 process=0xffff8000ffffb890 user=0xffff80001e451000, vmspace=0xfffffd8052add9a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 24731 37556 25533 0 2 0 syz-executor.1 *24731 94194 25533 0 7 0x4000000 syz-executor.1 34581 475047 7004 0 2 0 syz-executor.0 34581 347753 7004 0 3 0x4000000 smrbar syz-executor.0 21315 435634 0 0 3 0x14200 acct acct 51048 181094 0 0 3 0x14200 bored sosplice 25533 486581 14121 0 3 0x82 nanosleep syz-executor.1 7004 83826 14121 0 3 0x82 nanosleep syz-executor.0 14121 398239 37055 0 3 0x82 thrsleep syz-fuzzer 14121 387634 37055 0 3 0x4000082 thrsleep syz-fuzzer 14121 72204 37055 0 3 0x4000082 thrsleep syz-fuzzer 14121 486399 37055 0 3 0x4000082 thrsleep syz-fuzzer 14121 337034 37055 0 3 0x4000082 kqread syz-fuzzer 14121 408130 37055 0 3 0x4000082 thrsleep syz-fuzzer 14121 225743 37055 0 3 0x4000082 thrsleep syz-fuzzer 37055 108084 63338 0 3 0x10008a pause ksh 63338 67489 76246 0 3 0x92 select sshd 11698 253313 1 0 3 0x100083 ttyin getty 76246 290622 1 0 3 0x80 select sshd 99715 400313 74929 73 3 0x100090 kqread syslogd 74929 99326 1 0 3 0x100082 netio syslogd 19043 470217 1 77 3 0x100090 poll dhclient 25679 141138 1 0 3 0x80 poll dhclient 34440 49386 0 0 3 0x14200 bored smr 88043 154714 0 0 2 0x14200 zerothread 16789 518088 0 0 3 0x14200 aiodoned aiodoned 91754 40102 0 0 3 0x14200 syncer update 14822 337844 0 0 3 0x14200 cleaner cleaner 81073 389732 0 0 3 0x14200 reaper reaper 90593 113813 0 0 3 0x14200 pgdaemon pagedaemon 66924 419308 0 0 3 0x14200 bored crynlk 25123 100386 0 0 3 0x14200 bored crypto 66368 290970 0 0 3 0x40014200 acpi0 acpi0 33124 134812 0 0 3 0x14200 bored softnet 27420 116791 0 0 3 0x14200 bored systqmp 99271 50983 0 0 3 0x14200 bored systq 67780 372939 0 0 3 0x40014200 bored softclock 17327 380638 0 0 3 0x40014200 idle0 1 272205 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 9506 6354K 6739K 78643K 11033 0 pcb 17 8K 8K 78643K 405 0 rtable 100 3K 4K 78643K 273 0 ifaddr 82 16K 16K 78643K 125 0 counters 22 16K 16K 78643K 30 0 ioctlops 0 0K 2K 78643K 29 0 iov 0 0K 36K 78643K 75 0 mount 1 1K 1K 78643K 1 0 vnodes 1217 77K 77K 78643K 1388 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 13 0 VM map 2 0K 0K 78643K 2 0 sem 12 1K 1K 78643K 64 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 355 0 sigio 0 0K 0K 78643K 4 0 proc 50 38K 63K 78643K 417 0 subproc 32 2K 2K 78643K 34 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 107 0 in_multi 58 3K 3K 78643K 105 0 ether_multi 2 0K 0K 78643K 14 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 216 0 pfkey data 0 0K 1K 78643K 2 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 116 54K 70K 78643K 1733 0 UVM aobj 34 4K 4K 78643K 36 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 149 0 NDP 13 0K 0K 78643K 25 0 temp 135 3018K 3085K 78643K 6281 0 kqueue 4 6K 16K 78643K 28 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 arp 64 7 0 0 1 0 1 1 0 8 0 rtpcb 80 29 0 27 1 0 1 1 0 8 0 rtentry 112 50 0 10 2 0 2 2 0 8 0 unpcb 120 276 0 265 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 161 0 161 1 1 0 1 0 8 0 tcpcb 544 347 0 341 2 0 2 2 0 8 1 inpcb 280 1034 0 1021 3 0 3 3 0 8 2 ip6q 72 1 0 0 1 0 1 1 0 8 0 nd6 48 7 0 0 1 0 1 1 0 8 0 pkpcb 40 4 0 4 1 0 1 1 0 8 1 ppxss 1128 5 0 5 2 1 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 218 0 41 14 0 14 14 0 8 1 art_table 32 220 0 41 2 0 2 2 0 8 0 art_node 16 49 0 15 1 0 1 1 0 8 0 sysvmsgpl 40 30 0 14 2 1 1 1 0 8 0 semupl 112 10 0 10 1 1 0 1 0 8 0 semapl 112 62 0 52 1 0 1 1 0 8 0 shmpl 112 34 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1983 0 588 46 0 46 46 0 8 0 ffsino 240 1983 0 588 83 0 83 83 0 8 0 nchpl 144 2699 0 1088 60 0 60 60 0 8 0 uvmvnodes 72 2123 0 0 39 0 39 39 0 8 0 vnodes 208 2123 0 0 112 0 112 112 0 8 0 namei 1024 7455 0 7455 1 0 1 1 0 8 1 vcpupl 1984 3 0 0 1 0 1 1 0 8 0 vmpool 528 3 0 0 1 0 1 1 0 8 0 scxspl 192 8167 0 8167 1 0 1 1 0 8 1 plimitpl 152 44 0 37 1 0 1 1 0 8 0 sigapl 424 543 0 512 4 0 4 4 0 8 0 futexpl 56 10814 0 10814 1 0 1 1 0 8 1 knotepl 112 79 0 60 1 0 1 1 0 8 0 kqueuepl 144 75 0 72 1 0 1 1 0 8 0 pipelkpl 16 175 0 165 1 0 1 1 0 8 0 pipepl 120 350 0 331 1 0 1 1 0 8 0 fdescpl 432 527 0 512 2 0 2 2 0 8 0 filepl 120 4100 0 3995 5 0 5 5 0 8 1 lockfpl 104 220 0 219 1 0 1 1 0 8 0 lockfspl 48 92 0 91 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 366 0 359 1 0 1 1 0 8 0 zombiepl 144 512 0 512 1 0 1 1 0 8 1 processpl 896 543 0 512 4 0 4 4 0 8 0 procpl 624 962 0 923 4 0 4 4 0 8 0 sosppl 128 14 0 14 2 1 1 1 0 8 1 sockpl 400 1362 0 1337 7 0 7 7 0 8 4 mcl64k 65536 68 0 68 1 0 1 1 0 8 1 mcl16k 16384 4 0 4 2 1 1 1 0 8 1 mcl12k 12288 20 0 20 1 0 1 1 0 8 1 mcl9k 9216 5 0 5 1 0 1 1 0 8 1 mcl8k 8192 24 0 24 1 0 1 1 0 8 1 mcl4k 4096 48 0 48 2 1 1 1 0 8 1 mcl2k2 2112 1 0 1 1 1 0 1 0 8 0 mcl2k 2048 65604 0 65559 16 9 7 14 0 8 0 mtagpl 80 32 0 8 2 1 1 1 0 8 0 mbufpl 256 106799 0 106648 13 1 12 12 0 8 0 bufpl 280 4857 0 163 336 0 336 336 0 8 0 anonpl 16 59378 0 42589 71 1 70 70 0 107 1 amapchunkpl 152 2550 0 2404 22 2 20 20 0 158 14 amappl16 192 2513 0 1594 48 0 48 48 0 8 1 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 167 0 162 2 1 1 1 0 8 0 amappl13 168 23 0 22 1 0 1 1 0 8 0 amappl12 160 8 0 7 2 1 1 1 0 8 0 amappl11 152 64 0 52 1 0 1 1 0 8 0 amappl10 144 18 0 14 1 0 1 1 0 8 0 amappl9 136 542 0 537 1 0 1 1 0 8 0 amappl8 128 448 0 423 1 0 1 1 0 8 0 amappl7 120 104 0 94 1 0 1 1 0 8 0 amappl6 112 18 0 17 1 0 1 1 0 8 0 amappl5 104 312 0 301 1 0 1 1 0 8 0 amappl4 96 599 0 565 2 1 1 2 0 8 0 amappl3 88 284 0 277 1 0 1 1 0 8 0 amappl2 80 3413 0 3340 3 1 2 3 0 8 0 amappl1 72 18544 0 18115 26 16 10 20 0 8 0 amappl 80 1208 0 1160 2 0 2 2 0 84 0 dma4096 4096 1 0 1 1 1 0 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 64 35 0 2 1 0 1 1 0 8 0 uaddrrnd 24 530 0 512 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 530 0 512 1 0 1 1 0 8 0 vmmpekpl 168 7114 0 7084 2 0 2 2 0 8 0 vmmpepl 168 68871 0 66779 120 22 98 113 0 357 7 vmsppl 272 529 0 512 3 1 2 2 0 8 0 pdppl 4096 1066 0 1027 7 1 6 6 0 8 1 pvpl 32 189202 0 169359 168 0 168 168 0 265 6 pmappl 200 529 0 512 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 163 0 16 5 0 5 5 0 8 0