panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 78561 51767 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8222340e) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd80554dfa00,290,8,fffffd8054ffe620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd80554dfa00,290,8,fffffd8054ffe620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd80554dfa00,290,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4d3c08,fffffd80554dfa00,ffff80001e4746b0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e474908,ffff80001e474914,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e474908,ffff80001e474914,3c,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e474908,ffff80001e474914,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd80554dfa00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd80554dfa00,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd80554df100,ffff8000009d6b00,fffffd805e4d3930,0,0,fffffd805e4d38c0) at ip6_output+0xd02 rip6_output(fffffd80554df100,fffffd8054fdd790,ffff80001e474c70,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8054fdd790,9,fffffd80554df100,0,0,ffff80001d410c70) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8054fdd790,0,ffff80001e474eb8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 end trace frame: 0xffff80001e474ea0, 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(ffffffff8222340e) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd80554dfa00,290,8,fffffd8054ffe620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd80554dfa00,290,8,fffffd8054ffe620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd80554dfa00,290,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4d3c08,fffffd80554dfa00,ffff80001e4746b0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e474908,ffff80001e474914,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e474908,ffff80001e474914,3c,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e474908,ffff80001e474914,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd80554dfa00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd80554dfa00,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd80554df100,ffff8000009d6b00,fffffd805e4d3930,0,0,fffffd805e4d38c0) at ip6_output+0xd02 rip6_output(fffffd80554df100,fffffd8054fdd790,ffff80001e474c70,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8054fdd790,9,fffffd80554df100,0,0,ffff80001d410c70) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8054fdd790,0,ffff80001e474eb8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff80001d410c70,4,ffff80001e474eb8,0,ffff80001e474fa0) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff80001d410c70,ffff80001e474f58,ffff80001e474fa0) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001e475020) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x198c00a06a0, count: -18 ddb> show registers rdi 0xffffffff81af9e87 db_enter+0x17 rsi 0x34b8 __ALIGN_SIZE+0x24b8 rbp 0xffff80001e474420 rbx 0xffff80001e4744d0 rdx 0x34b9 __ALIGN_SIZE+0x24b9 rcx 0xffff80001d43f000 rax 0xffff80001d43f000 r8 0xffff80001e4743e0 r9 0x1 r10 0xffff8000009ece00 r11 0xaedba968b4b12bb3 r12 0x3000000008 r13 0xffff80001e474430 r14 0x100 r15 0x1 rip 0xffffffff81af9e88 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e474410 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=78561 stat=onproc flags process=0 proc=4000000 pri=53, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff80001d411b40,0xffffffff8256d990 process=0xffff8000ffff6010 user=0xffff80001e470000, vmspace=0xfffffd806bc09aa0 estcpu=19, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 51767 425547 51725 0 2 0 syz-executor.1 *51767 78561 51725 0 7 0x4000000 syz-executor.1 7991 84614 51367 0 3 0x3000 suspend syz-executor.0 7991 379882 51367 0 2 0x4081000 syz-executor.0 3728 405225 0 0 3 0x14200 bored sosplice 51367 186694 14751 0 2 0x482 syz-executor.0 51725 83862 14751 0 2 0x482 syz-executor.1 14751 382645 3267 0 3 0x82 thrsleep syz-fuzzer 14751 51602 3267 0 3 0x4000082 thrsleep syz-fuzzer 14751 385724 3267 0 3 0x4000082 thrsleep syz-fuzzer 14751 63463 3267 0 3 0x4000082 thrsleep syz-fuzzer 14751 370761 3267 0 3 0x4000082 kqread syz-fuzzer 14751 152762 3267 0 3 0x4000082 thrsleep syz-fuzzer 14751 218696 3267 0 3 0x4000082 thrsleep syz-fuzzer 14751 273447 3267 0 3 0x4000082 thrsleep syz-fuzzer 3267 13104 33189 0 3 0x10008a pause ksh 33189 434134 76784 0 3 0x92 select sshd 86254 487445 1 0 3 0x100083 ttyin getty 76784 393966 1 0 3 0x80 select sshd 57333 249976 3280 73 3 0x100090 kqread syslogd 3280 218736 1 0 3 0x100082 netio syslogd 99140 251562 1 77 3 0x100090 poll dhclient 37127 313930 1 0 3 0x80 poll dhclient 9985 171019 0 0 2 0x14200 zerothread 81918 5159 0 0 3 0x14200 aiodoned aiodoned 84318 20152 0 0 3 0x14200 syncer update 18982 499996 0 0 3 0x14200 cleaner cleaner 52592 363695 0 0 3 0x14200 reaper reaper 17932 64008 0 0 3 0x14200 pgdaemon pagedaemon 43523 107619 0 0 3 0x14200 bored crynlk 78313 242083 0 0 3 0x14200 bored crypto 77682 20554 0 0 3 0x40014200 acpi0 acpi0 89510 499452 0 0 3 0x14200 bored softnet 83501 326483 0 0 3 0x14200 bored systqmp 59966 296571 0 0 3 0x14200 bored systq 41348 177044 0 0 2 0x40014200 softclock 74944 25000 0 0 3 0x40014200 idle0 47571 17879 0 0 3 0x14200 bored smr 1 186695 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 9466 6337K 6725K 78643K 10713 0 pcb 17 8K 9K 78643K 53 0 rtable 108 3K 4K 78643K 236 0 ifaddr 50 11K 12K 78643K 79 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 15 0 iov 0 0K 12K 78643K 8 0 mount 1 1K 1K 78643K 1 0 vnodes 1221 77K 77K 78643K 1259 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 7 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 20 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 83 0 proc 48 38K 63K 78643K 370 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 0 0K 0K 78643K 4 0 in_multi 40 2K 2K 78643K 40 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 193 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 112 21K 22K 78643K 1036 0 UVM aobj 9 2K 2K 78643K 11 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 17 0 NDP 7 0K 0K 78643K 17 0 temp 89 3008K 3072K 78643K 3382 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 6 0 0 1 0 1 1 0 8 0 rtpcb 80 31 0 29 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 37 0 29 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 41 0 41 1 1 0 1 0 8 0 tcpcb 544 42 0 37 1 0 1 1 0 8 0 inpcb 280 194 0 183 2 0 2 2 0 8 1 nd6 48 4 0 0 1 0 1 1 0 8 0 ppxss 1128 4 0 4 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 212 0 0 14 0 14 14 0 8 0 art_table 32 213 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 18 0 8 1 0 1 1 0 8 0 shmpl 112 9 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1503 0 100 46 0 46 46 0 8 0 ffsino 240 1503 0 100 83 0 83 83 0 8 0 nchpl 144 1799 0 188 60 0 60 60 0 8 0 uvmvnodes 72 1571 0 0 29 0 29 29 0 8 0 vnodes 208 1571 0 0 83 0 83 83 0 8 0 namei 1024 4464 0 4464 1 0 1 1 0 8 1 scxspl 192 4820 0 4820 1 0 1 1 0 8 1 plimitpl 152 16 0 9 1 0 1 1 0 8 0 sigapl 432 254 0 240 2 0 2 2 0 8 0 futexpl 56 1664 0 1664 1 0 1 1 0 8 1 knotepl 112 55 0 36 1 0 1 1 0 8 0 kqueuepl 104 16 0 14 1 0 1 1 0 8 0 pipepl 112 154 0 135 1 0 1 1 0 8 0 fdescpl 424 255 0 240 2 0 2 2 0 8 0 filepl 120 1477 0 1378 4 0 4 4 0 8 0 lockfpl 104 16 0 15 1 0 1 1 0 8 0 lockfspl 48 6 0 5 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 21 0 11 1 0 1 1 0 8 0 ucredpl 96 114 0 107 1 0 1 1 0 8 0 zombiepl 144 241 0 240 1 0 1 1 0 8 0 processpl 872 270 0 240 4 0 4 4 0 8 0 procpl 632 343 0 304 4 0 4 4 0 8 0 sockpl 384 268 0 247 4 0 4 4 0 8 1 mcl64k 65536 4 0 4 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl9k 9216 2 0 2 1 0 1 1 0 8 1 mcl4k 4096 16 0 16 2 1 1 1 0 8 1 mcl2k 2048 68293 0 68247 14 2 12 12 0 8 6 mtagpl 80 6 0 2 2 1 1 1 0 8 0 mbufpl 256 107754 0 107667 11 2 9 9 0 8 0 bufpl 280 6296 0 1326 355 0 355 355 0 8 0 anonpl 16 42399 0 23415 78 1 77 77 0 107 0 amapchunkpl 152 1150 0 995 8 0 8 8 0 158 1 amappl16 192 1308 0 266 53 0 53 53 0 8 0 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 54 0 50 1 0 1 1 0 8 0 amappl12 160 27 0 25 2 1 1 1 0 8 0 amappl11 152 49 0 37 1 0 1 1 0 8 0 amappl10 144 13 0 9 1 0 1 1 0 8 0 amappl9 136 551 0 547 1 0 1 1 0 8 0 amappl8 128 127 0 102 1 0 1 1 0 8 0 amappl7 120 90 0 80 1 0 1 1 0 8 0 amappl6 112 54 0 46 1 0 1 1 0 8 0 amappl5 104 182 0 170 1 0 1 1 0 8 0 amappl4 96 443 0 415 1 0 1 1 0 8 0 amappl3 88 162 0 153 1 0 1 1 0 8 0 amappl2 80 1261 0 1184 3 1 2 3 0 8 0 amappl1 72 14330 0 13876 25 14 11 20 0 8 2 amappl 80 569 0 523 1 0 1 1 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 10 0 2 1 0 1 1 0 8 0 uaddrrnd 24 255 0 240 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 255 0 240 1 0 1 1 0 8 0 vmmpekpl 168 5816 0 5788 2 0 2 2 0 8 0 vmmpepl 168 38911 0 36642 129 3 126 126 0 357 27 vmsppl 272 254 0 240 2 0 2 2 0 8 1 pdppl 4096 516 0 480 6 0 6 6 0 8 1 pvpl 32 136823 0 114266 183 0 183 183 0 265 1 pmappl 200 254 0 240 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 141 0 7 4 0 4 4 0 8 0