panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 43236 32442 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822450f3) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8056d99500,198,2,ffff80001d423488) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8056d99500,198,2,ffff80001d423488) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8056d99500,198,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1146 ip6_savecontrol(fffffd805e5699d8,fffffd8056d99500,ffff80001d4235f0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d423848,ffff80001d423854,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d423848,ffff80001d423854,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d423848,ffff80001d423854,29,0,ffff8000009f1800) at ip6_input_if+0xf26 ipv6_input(ffff8000009f1800,fffffd8056d99500) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff8000009f1800,fffffd8056d99500,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8056d99e00,ffff800000a04480,fffffd805e569930,0,0,fffffd805e5698c0) at ip6_output+0xd02 rip6_output(fffffd8056d99900,fffffd805db01968,ffff80001d423bb0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805db01968,9,fffffd8056d99900,0,0,ffff80001d33a868) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805db01968,0,ffff80001d423df8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001d423de0, 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(ffffffff822450f3) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8056d99500,198,2,ffff80001d423488) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8056d99500,198,2,ffff80001d423488) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8056d99500,198,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1146 ip6_savecontrol(fffffd805e5699d8,fffffd8056d99500,ffff80001d4235f0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d423848,ffff80001d423854,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d423848,ffff80001d423854,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d423848,ffff80001d423854,29,0,ffff8000009f1800) at ip6_input_if+0xf26 ipv6_input(ffff8000009f1800,fffffd8056d99500) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff8000009f1800,fffffd8056d99500,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8056d99e00,ffff800000a04480,fffffd805e569930,0,0,fffffd805e5698c0) at ip6_output+0xd02 rip6_output(fffffd8056d99900,fffffd805db01968,ffff80001d423bb0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805db01968,9,fffffd8056d99900,0,0,ffff80001d33a868) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805db01968,0,ffff80001d423df8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d33a868,3,ffff80001d423df8,0,ffff80001d423ee0) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d33a868,ffff80001d423e98,ffff80001d423ee0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d423f60) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9cb989f17a0, count: -18 ddb> show registers rdi 0xffffffff81dfb597 db_enter+0x17 rsi 0x27c7 __ALIGN_SIZE+0x17c7 rbp 0xffff80001d423360 rbx 0xffff80001d423410 rdx 0x27c8 __ALIGN_SIZE+0x17c8 rcx 0xffff80001f62d000 rax 0xffff80001f62d000 r8 0xffff80001d423320 r9 0x1 r10 0xffff8000009f3300 r11 0xd4756ddfa53e72e1 r12 0x3000000008 r13 0xffff80001d423370 r14 0x100 r15 0x1 rip 0xffffffff81dfb598 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d423350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=43236 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=64, nice=20 forw=0xffffffffffffffff, list=0xffff80001d339278,0xffffffff825accb0 process=0xffff8000ffffb890 user=0xffff80001d41f000, vmspace=0xfffffd806bc0a440 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 32442 406913 10708 0 2 0 syz-executor.0 *32442 43236 10708 0 7 0x4000000 syz-executor.0 49905 496942 0 0 3 0x14200 bored sosplice 10708 157323 27503 0 3 0x82 nanosleep syz-executor.0 46607 214470 27503 0 3 0x82 nanosleep syz-executor.1 27503 322467 32579 0 3 0x82 thrsleep syz-fuzzer 27503 78390 32579 0 3 0x4000082 thrsleep syz-fuzzer 27503 34311 32579 0 3 0x4000082 kqread syz-fuzzer 27503 203600 32579 0 3 0x4000082 thrsleep syz-fuzzer 27503 388156 32579 0 3 0x4000082 thrsleep syz-fuzzer 27503 94735 32579 0 3 0x4000082 thrsleep syz-fuzzer 27503 79455 32579 0 3 0x4000082 thrsleep syz-fuzzer 32579 58973 23332 0 3 0x10008a pause ksh 23332 168338 39897 0 3 0x92 select sshd 14970 196303 1 0 3 0x100083 ttyin getty 39897 467476 1 0 3 0x80 select sshd 80396 391378 60668 73 3 0x100090 kqread syslogd 60668 11065 1 0 3 0x100082 netio syslogd 26163 198719 1 77 3 0x100090 poll dhclient 70435 223704 1 0 3 0x80 poll dhclient 30735 502160 0 0 3 0x14200 bored smr 46915 489357 0 0 2 0x14200 zerothread 63563 91996 0 0 3 0x14200 aiodoned aiodoned 32993 16811 0 0 3 0x14200 syncer update 59840 357217 0 0 3 0x14200 cleaner cleaner 41676 348953 0 0 3 0x14200 reaper reaper 99532 332788 0 0 3 0x14200 pgdaemon pagedaemon 83629 94875 0 0 3 0x14200 bored crynlk 2384 155307 0 0 3 0x14200 bored crypto 78447 150919 0 0 3 0x40014200 acpi0 acpi0 9054 135220 0 0 3 0x14200 bored softnet 9234 460039 0 0 3 0x14200 bored systqmp 31914 510504 0 0 3 0x14200 bored systq 96590 272626 0 0 3 0x40014200 bored softclock 29672 494516 0 0 3 0x40014200 idle0 1 510059 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 9512 6353K 6858K 78643K 11377 0 pcb 15 8K 8K 78643K 83 0 rtable 81 2K 3K 78643K 341 0 ifaddr 73 14K 15K 78643K 127 0 counters 20 16K 16K 78643K 28 0 ioctlops 0 0K 2K 78643K 181 0 iov 0 0K 14K 78643K 57 0 mount 1 1K 1K 78643K 1 0 vnodes 1219 77K 77K 78643K 1504 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 297 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 344 0 sigio 1 0K 0K 78643K 4 0 proc 49 38K 63K 78643K 383 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 67 0 in_multi 47 2K 3K 78643K 115 0 ether_multi 1 0K 0K 78643K 12 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 79 360K 360K 78643K 79 0 exec 0 0K 1K 78643K 223 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 105 38K 38K 78643K 1642 0 UVM aobj 106 3K 3K 78643K 106 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 60 0 NDP 12 0K 0K 78643K 29 0 temp 126 3017K 3081K 78643K 29856 0 kqueue 3 4K 15K 78643K 43 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 8 0 4 1 0 1 1 0 8 0 rtpcb 80 67 0 65 1 0 1 1 0 8 0 rtentry 112 69 0 37 2 0 2 2 0 8 0 unpcb 120 205 0 197 1 0 1 1 0 8 0 syncache 264 8 0 8 2 2 0 1 0 8 0 tcpqe 32 22 0 22 2 2 0 1 0 8 0 tcpcb 544 382 0 377 3 2 1 3 0 8 0 ipq 40 4 0 4 1 1 0 1 0 8 0 ipqe 40 10 0 10 1 1 0 1 0 8 0 inpcb 280 633 0 624 4 2 2 4 0 8 1 nd6 48 11 0 8 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 311 0 167 13 0 13 13 0 8 2 art_table 32 312 0 167 2 0 2 2 0 8 0 art_node 16 68 0 40 1 0 1 1 0 8 0 sysvmsgpl 40 35 0 26 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 295 0 285 1 0 1 1 0 8 0 shmpl 112 104 0 0 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1925 0 530 46 0 46 46 0 8 0 ffsino 240 1925 0 530 83 0 83 83 0 8 0 nchpl 144 2589 0 980 60 0 60 60 0 8 0 uvmvnodes 72 2141 0 0 39 0 39 39 0 8 0 vnodes 208 2141 0 0 113 0 113 113 0 8 0 namei 1024 7995 0 7995 1 0 1 1 0 8 1 vcpupl 1984 1 0 0 1 0 1 1 0 8 0 vmpool 528 3 0 2 1 0 1 1 0 8 0 scxspl 192 9051 0 9051 1 0 1 1 0 8 1 plimitpl 152 46 0 39 1 0 1 1 0 8 0 sigapl 424 531 0 502 4 0 4 4 0 8 0 futexpl 56 11052 0 11052 1 0 1 1 0 8 1 knotepl 112 110 0 91 1 0 1 1 0 8 0 kqueuepl 144 106 0 104 1 0 1 1 0 8 0 pipelkpl 16 149 0 139 1 0 1 1 0 8 0 pipepl 120 298 0 279 1 0 1 1 0 8 0 fdescpl 432 516 0 502 2 0 2 2 0 8 0 filepl 120 4388 0 4289 6 2 4 5 0 8 0 lockfpl 104 159 0 158 1 0 1 1 0 8 0 lockfspl 48 67 0 66 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 1263 0 1256 1 0 1 1 0 8 0 zombiepl 144 502 0 501 1 0 1 1 0 8 0 processpl 896 531 0 501 4 0 4 4 0 8 0 procpl 624 946 0 909 4 0 4 4 0 8 1 sosppl 128 4 0 4 1 1 0 1 0 8 0 sockpl 400 910 0 891 7 3 4 7 0 8 2 mcl64k 65536 40 0 40 1 0 1 1 0 8 1 mcl16k 16384 6 0 6 1 1 0 1 0 8 0 mcl12k 12288 9 0 9 2 1 1 1 0 8 1 mcl9k 9216 3 0 3 1 1 0 1 0 8 0 mcl8k 8192 18 0 18 1 0 1 1 0 8 1 mcl4k 4096 41 0 41 2 1 1 1 0 8 1 mcl2k2 2112 3 0 3 2 1 1 1 0 8 1 mcl2k 2048 64399 0 64356 16 9 7 12 0 8 1 mtagpl 80 52 0 16 2 1 1 1 0 8 0 mbufpl 256 104466 0 104300 21 3 18 18 0 8 1 bufpl 280 4991 0 168 345 0 345 345 0 8 0 anonpl 16 73458 0 57497 86 5 81 81 0 107 16 amapchunkpl 152 2287 0 2154 12 3 9 9 0 158 3 amappl16 192 3264 0 2391 64 12 52 56 0 8 8 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 169 0 165 2 1 1 1 0 8 0 amappl13 168 23 0 22 1 0 1 1 0 8 0 amappl12 160 154 0 150 1 0 1 1 0 8 0 amappl11 152 70 0 57 1 0 1 1 0 8 0 amappl10 144 15 0 11 1 0 1 1 0 8 0 amappl9 136 385 0 381 1 0 1 1 0 8 0 amappl8 128 278 0 256 1 0 1 1 0 8 0 amappl7 120 105 0 94 1 0 1 1 0 8 0 amappl6 112 26 0 19 1 0 1 1 0 8 0 amappl5 104 605 0 592 1 0 1 1 0 8 0 amappl4 96 444 0 417 1 0 1 1 0 8 0 amappl3 88 279 0 274 1 0 1 1 0 8 0 amappl2 80 3353 0 3288 3 1 2 3 0 8 0 amappl1 72 18393 0 17982 27 18 9 20 0 8 0 amappl 80 1175 0 1133 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 64 105 0 0 2 0 2 2 0 8 0 uaddrrnd 24 519 0 504 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 519 0 504 1 0 1 1 0 8 0 vmmpekpl 168 7578 0 7553 2 0 2 2 0 8 0 vmmpepl 168 69998 0 68063 115 18 97 106 0 357 10 vmsppl 272 518 0 504 2 0 2 2 0 8 1 pdppl 4096 1044 0 1009 6 1 5 6 0 8 0 pvpl 32 221921 0 202988 193 3 190 190 0 265 36 pmappl 200 518 0 504 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 167 0 22 5 0 5 5 0 8 0