panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *407918 81137 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224cd80) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805dd1ef00,30,2,ffff80001e22bb88) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805dd1ef00,30,2,ffff80001e22bb88) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805dd1ef00,30,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1146 ip6_savecontrol(fffffd805e55b9d8,fffffd805dd1ef00,ffff80001e22bcf0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e22bf48,ffff80001e22bf54,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e22bf48,ffff80001e22bf54,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e22bf48,ffff80001e22bf54,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805dd1ef00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805dd1ef00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805dd1e800,ffff800000a0a300,fffffd805e55b930,0,0,fffffd805e55b8c0) at ip6_output+0xd02 rip6_output(fffffd805dd1e800,fffffd80611fd7e8,ffff80001e22c2b0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80611fd7e8,9,fffffd805dd1e800,0,0,ffff80001d751018) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80611fd7e8,0,ffff80001e22c4f8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001e22c4e0, 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(ffffffff8224cd80) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805dd1ef00,30,2,ffff80001e22bb88) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805dd1ef00,30,2,ffff80001e22bb88) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805dd1ef00,30,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1146 ip6_savecontrol(fffffd805e55b9d8,fffffd805dd1ef00,ffff80001e22bcf0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e22bf48,ffff80001e22bf54,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e22bf48,ffff80001e22bf54,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e22bf48,ffff80001e22bf54,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805dd1ef00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805dd1ef00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805dd1e800,ffff800000a0a300,fffffd805e55b930,0,0,fffffd805e55b8c0) at ip6_output+0xd02 rip6_output(fffffd805dd1e800,fffffd80611fd7e8,ffff80001e22c2b0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80611fd7e8,9,fffffd805dd1e800,0,0,ffff80001d751018) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80611fd7e8,0,ffff80001e22c4f8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d751018,6,ffff80001e22c4f8,0,ffff80001e22c5e0) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d751018,ffff80001e22c598,ffff80001e22c5e0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e22c660) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xce1ee2a4e00, count: -18 ddb> show registers rdi 0xffffffff82055347 db_enter+0x17 rsi 0x1063 __ALIGN_SIZE+0x63 rbp 0xffff80001e22ba60 rbx 0xffff80001e22bb10 rdx 0x1064 __ALIGN_SIZE+0x64 rcx 0xffff80001d81b000 rax 0xffff80001d81b000 r8 0xffff80001e22ba20 r9 0x1 r10 0xffff8000009f9140 r11 0x47ff3c111f8fe94 r12 0x3000000008 r13 0xffff80001e22ba70 r14 0x100 r15 0x1 rip 0xffffffff82055348 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e22ba50 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=407918 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff80001d752878,0xffffffff8257d448 process=0xffff8000ffff8ae0 user=0xffff80001e227000, vmspace=0xfffffd806bc09ee0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 81137 415218 84239 0 2 0 syz-executor.0 *81137 407918 84239 0 7 0x4000000 syz-executor.0 54640 197181 47456 0 2 0 syz-executor.1 54640 382111 47456 0 3 0x4000080 pppxread syz-executor.1 81787 459264 0 0 3 0x14200 bored sosplice 47456 461118 30346 0 3 0x82 nanosleep syz-executor.1 84239 66652 30346 0 3 0x82 nanosleep syz-executor.0 30346 357910 92819 0 3 0x82 thrsleep syz-fuzzer 30346 232194 92819 0 3 0x4000082 nanosleep syz-fuzzer 30346 198637 92819 0 3 0x4000082 thrsleep syz-fuzzer 30346 39151 92819 0 3 0x4000082 thrsleep syz-fuzzer 30346 516372 92819 0 3 0x4000082 thrsleep syz-fuzzer 30346 452898 92819 0 3 0x4000082 thrsleep syz-fuzzer 30346 75442 92819 0 3 0x4000082 thrsleep syz-fuzzer 30346 67667 92819 0 3 0x4000082 kqread syz-fuzzer 92819 418436 15905 0 3 0x10008a pause ksh 15905 516102 92628 0 3 0x92 select sshd 78927 414704 1 0 3 0x100083 ttyin getty 92628 135929 1 0 3 0x80 select sshd 2871 426981 76656 73 3 0x100090 kqread syslogd 76656 345729 1 0 3 0x100082 netio syslogd 72180 243531 1 77 3 0x100090 poll dhclient 12546 10703 1 0 3 0x80 poll dhclient 294 334307 0 0 3 0x14200 bored smr 51091 137363 0 0 2 0x14200 zerothread 31226 1375 0 0 3 0x14200 aiodoned aiodoned 14933 50872 0 0 3 0x14200 syncer update 17049 68324 0 0 3 0x14200 cleaner cleaner 99232 324640 0 0 3 0x14200 reaper reaper 70371 61940 0 0 3 0x14200 pgdaemon pagedaemon 42375 261808 0 0 3 0x14200 bored crynlk 20823 135052 0 0 3 0x14200 bored crypto 92573 236005 0 0 3 0x40014200 acpi0 acpi0 98614 1836 0 0 3 0x14200 bored softnet 32734 230450 0 0 3 0x14200 bored systqmp 13816 433163 0 0 3 0x14200 bored systq 96479 129273 0 0 3 0x40014200 bored softclock 20388 33064 0 0 3 0x40014200 idle0 1 276016 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 9490 6339K 7110K 78643K 11524 0 pcb 16 8K 8K 78643K 96 0 rtable 107 3K 3K 78643K 247 0 ifaddr 74 15K 15K 78643K 103 0 counters 21 16K 16K 78643K 26 0 ioctlops 0 0K 2K 78643K 19 0 iov 0 0K 12K 78643K 38 0 mount 1 1K 1K 78643K 1 0 vnodes 1229 77K 78K 78643K 1476 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 7 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 56 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 280 0 sigio 0 0K 0K 78643K 6 0 proc 49 38K 63K 78643K 422 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 34 0 in_multi 79 3K 3K 78643K 111 0 ether_multi 2 0K 0K 78643K 12 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 204 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 100 21K 37K 78643K 1479 0 UVM aobj 8 2K 2K 78643K 16 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 84 0 NDP 10 0K 0K 78643K 19 0 temp 101 3037K 3101K 78643K 15782 0 kqueue 3 4K 18K 78643K 23 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 36 0 34 1 0 1 1 0 8 0 rtentry 112 46 0 1 2 0 2 2 0 8 0 unpcb 120 233 0 224 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 sackhl 24 1 0 1 1 1 0 1 0 8 0 tcpqe 32 93 0 93 1 1 0 1 0 8 0 tcpcb 544 109 0 103 1 0 1 1 0 8 0 ipq 40 2 0 2 1 1 0 1 0 8 0 ipqe 40 4 0 4 1 1 0 1 0 8 0 inpcb 280 357 0 346 3 1 2 2 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 194 0 0 13 0 13 13 0 8 0 art_table 32 196 0 0 2 0 2 2 0 8 0 art_node 16 45 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 6 0 5 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 52 0 42 1 0 1 1 0 8 0 shmpl 112 14 0 8 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1790 0 392 46 0 46 46 0 8 0 ffsino 240 1790 0 392 83 0 83 83 0 8 0 nchpl 144 2480 0 879 60 0 60 60 0 8 0 uvmvnodes 72 2050 0 0 38 0 38 38 0 8 0 vnodes 208 2050 0 0 108 0 108 108 0 8 0 namei 1024 6937 0 6937 1 0 1 1 0 8 1 scxspl 192 7538 0 7538 1 0 1 1 0 8 1 plimitpl 152 32 0 25 1 0 1 1 0 8 0 sigapl 424 467 0 437 4 0 4 4 0 8 0 futexpl 56 6208 0 6208 1 0 1 1 0 8 1 knotepl 112 79 0 60 1 0 1 1 0 8 0 kqueuepl 144 46 0 44 1 0 1 1 0 8 0 pipelkpl 16 101 0 91 1 0 1 1 0 8 0 pipepl 120 202 0 183 1 0 1 1 0 8 0 fdescpl 432 452 0 437 2 0 2 2 0 8 0 filepl 120 2907 0 2807 4 0 4 4 0 8 0 lockfpl 104 97 0 96 1 0 1 1 0 8 0 lockfspl 48 36 0 35 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 17 0 7 1 0 1 1 0 8 0 ucredpl 96 249 0 242 1 0 1 1 0 8 0 zombiepl 144 437 0 437 1 0 1 1 0 8 1 processpl 920 467 0 437 4 0 4 4 0 8 0 procpl 624 795 0 756 4 0 4 4 0 8 0 sosppl 128 5 0 5 2 1 1 1 0 8 1 sockpl 400 630 0 608 4 1 3 3 0 8 0 mcl64k 65536 257 0 257 30 14 16 29 0 8 16 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 3 0 3 2 1 1 1 0 8 1 mcl9k 9216 3 0 3 2 2 0 1 0 8 0 mcl8k 8192 5 0 5 2 1 1 1 0 8 1 mcl4k 4096 25 0 25 3 2 1 1 0 8 1 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 61993 0 61947 16 9 7 13 0 8 0 mtagpl 80 97 0 3 3 1 2 2 0 8 0 mbufpl 256 100116 0 99835 34 6 28 32 0 8 8 bufpl 280 6068 0 684 385 0 385 385 0 8 0 anonpl 16 63300 0 48987 77 4 73 75 0 107 12 amapchunkpl 152 2680 0 2541 28 14 14 20 0 158 8 amappl16 192 2465 0 1664 52 7 45 52 0 8 4 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 3 0 2 2 1 1 1 0 8 0 amappl13 168 24 0 23 1 0 1 1 0 8 0 amappl12 160 152 0 148 1 0 1 1 0 8 0 amappl11 152 185 0 169 1 0 1 1 0 8 0 amappl10 144 16 0 11 1 0 1 1 0 8 0 amappl9 136 378 0 375 1 0 1 1 0 8 0 amappl8 128 270 0 253 1 0 1 1 0 8 0 amappl7 120 105 0 95 1 0 1 1 0 8 0 amappl6 112 133 0 129 1 0 1 1 0 8 0 amappl5 104 524 0 510 1 0 1 1 0 8 0 amappl4 96 438 0 409 1 0 1 1 0 8 0 amappl3 88 110 0 105 1 0 1 1 0 8 0 amappl2 80 2829 0 2756 3 1 2 3 0 8 0 amappl1 72 17380 0 16950 27 18 9 20 0 8 0 amappl 80 1021 0 977 2 1 1 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 15 0 8 1 0 1 1 0 8 0 uaddrrnd 24 452 0 437 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 452 0 437 1 0 1 1 0 8 0 vmmpekpl 168 6631 0 6603 2 0 2 2 0 8 0 vmmpepl 168 60336 0 58364 109 19 90 104 0 357 4 vmsppl 272 451 0 437 2 1 1 2 0 8 0 pdppl 4096 910 0 874 6 1 5 6 0 8 0 pvpl 32 221348 0 203956 274 2 272 274 0 265 129 pmappl 200 451 0 437 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 207 0 38 6 0 6 6 0 8 0