panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *321032 84895 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82251c3f) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806bc22600,6f8,8,fffffd805e35e220) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806bc22600,6f8,8,fffffd805e35e220) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806bc22600,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e568d20,fffffd806bc22600,ffff80001f869490) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001f8696e8,ffff80001f8696f4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001f8696e8,ffff80001f8696f4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001f8696e8,ffff80001f8696f4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd806bc22600) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd806bc22600,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd806bc22000,ffff800000a08300,fffffd805e5685e8,0,0,fffffd805e568578) at ip6_output+0xd02 rip6_output(fffffd806bc22000,fffffd805e569320,ffff80001f869a50,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805e569320,9,fffffd806bc22000,0,0,ffff80001d751290) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805e569320,0,ffff80001f869c98,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001f869c80, 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(ffffffff82251c3f) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806bc22600,6f8,8,fffffd805e35e220) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806bc22600,6f8,8,fffffd805e35e220) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806bc22600,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e568d20,fffffd806bc22600,ffff80001f869490) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001f8696e8,ffff80001f8696f4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001f8696e8,ffff80001f8696f4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001f8696e8,ffff80001f8696f4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd806bc22600) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd806bc22600,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd806bc22000,ffff800000a08300,fffffd805e5685e8,0,0,fffffd805e568578) at ip6_output+0xd02 rip6_output(fffffd806bc22000,fffffd805e569320,ffff80001f869a50,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805e569320,9,fffffd806bc22000,0,0,ffff80001d751290) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805e569320,0,ffff80001f869c98,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d751290,4,ffff80001f869c98,0,ffff80001f869d80) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d751290,ffff80001f869d38,ffff80001f869d80) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001f869e00) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x4daa65d5800, count: -18 ddb> show registers rdi 0xffffffff81dd70b7 db_enter+0x17 rsi 0x2cf3 __ALIGN_SIZE+0x1cf3 rbp 0xffff80001f869200 rbx 0xffff80001f8692b0 rdx 0x2cf4 __ALIGN_SIZE+0x1cf4 rcx 0xffff800020a35000 rax 0xffff800020a35000 r8 0xffff80001f8691c0 r9 0x1 r10 0xffff800000a2aa00 r11 0xa724b38d7c38f7eb r12 0x3000000008 r13 0xffff80001f869210 r14 0x100 r15 0x1 rip 0xffffffff81dd70b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001f8691f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=321032 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff80001d751ec0,0xffffffff82596088 process=0xffff8000ffffaad8 user=0xffff80001f864000, vmspace=0xfffffd80648a9998 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 84895 209144 12770 0 2 0 syz-executor.1 *84895 321032 12770 0 7 0x4000000 syz-executor.1 74991 72716 39887 0 3 0x80 nanosleep syz-executor.0 74991 427549 39887 0 3 0x4000080 netio syz-executor.0 74991 88414 39887 0 3 0x4000080 fsleep syz-executor.0 39887 486291 15734 0 3 0x82 nanosleep syz-executor.0 3842 249113 0 0 3 0x14200 acct acct 12770 290134 15734 0 3 0x82 nanosleep syz-executor.1 96040 63471 0 0 3 0x14200 bored sosplice 15734 253628 17931 0 3 0x82 thrsleep syz-fuzzer 15734 67302 17931 0 3 0x4000082 thrsleep syz-fuzzer 15734 79089 17931 0 3 0x4000082 thrsleep syz-fuzzer 15734 282416 17931 0 3 0x4000082 thrsleep syz-fuzzer 15734 514480 17931 0 3 0x4000082 thrsleep syz-fuzzer 15734 408257 17931 0 3 0x4000082 kqread syz-fuzzer 15734 276188 17931 0 3 0x4000082 thrsleep syz-fuzzer 15734 33518 17931 0 3 0x4000082 thrsleep syz-fuzzer 17931 514790 61354 0 3 0x10008a pause ksh 61354 307815 18709 0 3 0x92 select sshd 51456 101645 1 0 3 0x100083 ttyin getty 18709 327282 1 0 3 0x80 select sshd 14343 5164 77938 73 3 0x100090 kqread syslogd 77938 93837 1 0 3 0x100082 netio syslogd 63614 12923 0 0 3 0x14200 bored smr 85979 20490 0 0 2 0x14200 zerothread 46269 268294 0 0 3 0x14200 aiodoned aiodoned 53691 234411 0 0 3 0x14200 syncer update 73181 245188 0 0 3 0x14200 cleaner cleaner 65273 359571 0 0 3 0x14200 reaper reaper 70879 473343 0 0 3 0x14200 pgdaemon pagedaemon 30056 422640 0 0 3 0x14200 bored crynlk 47696 490690 0 0 3 0x14200 bored crypto 14440 140636 0 0 3 0x40014200 acpi0 acpi0 49826 225127 0 0 3 0x14200 bored softnet 93122 12446 0 0 3 0x14200 bored systqmp 82880 104591 0 0 3 0x14200 bored systq 25420 202164 0 0 3 0x40014200 bored softclock 29412 234157 0 0 3 0x40014200 idle0 1 40030 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 6562K 6852K 78643K 11498 0 pcb 16 8K 8K 78643K 92 0 rtable 110 3K 4K 78643K 304 0 ifaddr 71 14K 16K 78643K 123 0 counters 21 16K 16K 78643K 25 0 ioctlops 0 0K 2K 78643K 59 0 iov 0 0K 16K 78643K 62 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 77K 78643K 1802 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 6 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 58 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 1088 0 sigio 0 0K 0K 78643K 4 0 proc 45 30K 63K 78643K 503 0 subproc 32 2K 2K 78643K 68 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 45 0 in_multi 90 4K 4K 78643K 150 0 ether_multi 2 0K 0K 78643K 11 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 263 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 53K 57K 78643K 3183 0 UVM aobj 16 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 68 0 NDP 12 0K 0K 78643K 25 0 temp 101 3035K 3099K 78643K 11860 0 kqueue 3 4K 13K 78643K 25 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 12 0 6 1 0 1 1 0 8 0 rtpcb 80 33 0 33 2 1 1 1 0 8 1 rtentry 112 78 0 33 2 0 2 2 0 8 0 unpcb 120 918 0 909 1 0 1 1 0 8 0 syncache 264 9 0 9 4 3 1 1 0 8 1 tcpqe 32 76 0 76 2 2 0 1 0 8 0 tcpcb 544 153 0 148 1 0 1 1 0 8 0 ipq 40 85 0 85 2 1 1 1 0 8 1 ipqe 40 3739 0 3739 2 1 1 1 0 8 1 inpcb 280 2249 0 2239 2 0 2 2 0 8 1 nd6 48 13 0 7 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 swfcl 56 4 0 0 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 1 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 318 0 120 14 1 13 13 0 8 0 art_table 32 320 0 120 2 0 2 2 0 8 0 art_node 16 77 0 36 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 11 1 0 1 1 0 8 0 semupl 112 4 0 4 2 2 0 1 0 8 0 semapl 112 54 0 44 1 0 1 1 0 8 0 shmpl 112 14 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2614 0 1220 46 0 46 46 0 8 0 ffsino 240 2614 0 1220 83 0 83 83 0 8 0 nchpl 144 4101 0 2505 60 0 60 60 0 8 0 uvmvnodes 72 3182 0 0 58 0 58 58 0 8 0 vnodes 208 3182 0 0 168 0 168 168 0 8 0 namei 1024 10406 0 10406 1 0 1 1 0 8 1 vcpupl 1984 4 0 0 1 0 1 1 0 8 0 vmpool 528 5 0 1 1 0 1 1 0 8 0 scxspl 192 12201 0 12201 1 0 1 1 0 8 1 plimitpl 152 46 0 40 1 0 1 1 0 8 0 sigapl 424 1270 0 1241 4 0 4 4 0 8 0 futexpl 56 14828 0 14827 1 0 1 1 0 8 0 knotepl 112 112 0 93 1 0 1 1 0 8 0 kqueuepl 144 71 0 65 1 0 1 1 0 8 0 pipelkpl 16 191 0 181 1 0 1 1 0 8 0 pipepl 120 382 0 363 1 0 1 1 0 8 0 fdescpl 432 1254 0 1241 2 0 2 2 0 8 0 filepl 120 6905 0 6811 4 0 4 4 0 8 1 lockfpl 104 412 0 412 1 0 1 1 0 8 1 lockfspl 48 185 0 185 1 0 1 1 0 8 1 sessionpl 112 19 0 11 1 0 1 1 0 8 0 pgrppl 48 70 0 62 1 0 1 1 0 8 0 ucredpl 96 292 0 286 1 0 1 1 0 8 0 zombiepl 144 1241 0 1241 1 0 1 1 0 8 1 processpl 920 1270 0 1241 4 0 4 4 0 8 0 procpl 624 2356 0 2317 5 1 4 4 0 8 0 sosppl 128 49 0 49 2 2 0 1 0 8 0 sockpl 400 3202 0 3183 5 2 3 4 0 8 1 mcl64k 65536 166 0 165 2 1 1 1 0 8 0 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 16 0 16 2 1 1 1 0 8 1 mcl9k 9216 10 0 10 2 1 1 1 0 8 1 mcl8k 8192 8 0 8 1 1 0 1 0 8 0 mcl4k 4096 186 0 186 3 2 1 1 0 8 1 mcl2k2 2112 6 0 6 3 2 1 1 0 8 1 mcl2k 2048 63536 0 63491 15 8 7 13 0 8 1 mtagpl 80 44 0 34 2 1 1 1 0 8 0 mbufpl 256 121095 0 120994 26 8 18 21 0 8 8 bufpl 280 7944 0 1544 458 0 458 458 0 8 0 anonpl 16 120811 0 106875 75 16 59 75 0 107 1 amapchunkpl 152 6032 0 5902 19 13 6 19 0 158 0 amappl16 192 5207 0 4418 51 8 43 48 0 8 3 amappl15 184 9 0 9 1 0 1 1 0 8 1 amappl14 176 490 0 485 2 1 1 1 0 8 0 amappl13 168 46 0 43 1 0 1 1 0 8 0 amappl12 160 5 0 5 1 1 0 1 0 8 0 amappl11 152 69 0 61 1 0 1 1 0 8 0 amappl10 144 136 0 134 1 0 1 1 0 8 0 amappl9 136 786 0 782 1 0 1 1 0 8 0 amappl8 128 707 0 688 1 0 1 1 0 8 0 amappl7 120 237 0 225 1 0 1 1 0 8 0 amappl6 112 28 0 21 1 0 1 1 0 8 0 amappl5 104 1131 0 1122 1 0 1 1 0 8 0 amappl4 96 472 0 442 2 1 1 2 0 8 0 amappl3 88 245 0 238 1 0 1 1 0 8 0 amappl2 80 8762 0 8696 3 1 2 3 0 8 0 amappl1 72 30965 0 30559 25 16 9 20 0 8 0 amappl 80 2665 0 2623 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 15 0 0 1 0 1 1 0 8 0 uaddrrnd 24 1259 0 1242 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1259 0 1242 1 0 1 1 0 8 0 vmmpekpl 168 10278 0 10247 2 0 2 2 0 8 0 vmmpepl 168 148279 0 146389 128 21 107 107 0 357 24 vmsppl 272 1258 0 1242 2 0 2 2 0 8 0 pdppl 4096 2524 0 2488 6 1 5 6 0 8 0 pvpl 32 451171 0 434159 278 25 253 278 0 265 113 pmappl 200 1258 0 1242 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 172 0 28 5 0 5 5 0 8 0