panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *228809 72016 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224c508) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805f98ff00,30,8,fffffd805f98f620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805f98ff00,30,8,fffffd805f98f620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805f98ff00,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd80614e3348,fffffd805f98ff00,ffff80001d4000a0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d4002f8,ffff80001d400304,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d4002f8,ffff80001d400304,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d4002f8,ffff80001d400304,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805f98ff00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805f98ff00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805f98f000,ffff800000a07a00,fffffd80614e3700,0,0,fffffd80614e3690) at ip6_output+0xd02 rip6_output(fffffd805f98f000,fffffd80555f1970,ffff80001d400660,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80555f1970,9,fffffd805f98f000,0,0,ffff80001d352608) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80555f1970,0,ffff80001d4008a8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001d400890, 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(ffffffff8224c508) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805f98ff00,30,8,fffffd805f98f620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805f98ff00,30,8,fffffd805f98f620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805f98ff00,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd80614e3348,fffffd805f98ff00,ffff80001d4000a0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d4002f8,ffff80001d400304,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d4002f8,ffff80001d400304,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d4002f8,ffff80001d400304,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805f98ff00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805f98ff00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805f98f000,ffff800000a07a00,fffffd80614e3700,0,0,fffffd80614e3690) at ip6_output+0xd02 rip6_output(fffffd805f98f000,fffffd80555f1970,ffff80001d400660,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80555f1970,9,fffffd805f98f000,0,0,ffff80001d352608) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80555f1970,0,ffff80001d4008a8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d352608,6,ffff80001d4008a8,0,ffff80001d400990) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d352608,ffff80001d400948,ffff80001d400990) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d400a10) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc04133cbd60, count: -18 ddb> show registers rdi 0xffffffff81d83d37 db_enter+0x17 rsi 0x1035 __ALIGN_SIZE+0x35 rbp 0xffff80001d3ffe10 rbx 0xffff80001d3ffec0 rdx 0x1036 __ALIGN_SIZE+0x36 rcx 0xffff80001d409000 rax 0xffff80001d409000 r8 0xffff80001d3ffdd0 r9 0x1 r10 0xffff8000009f8140 r11 0xcd592d97f07de94b r12 0x3000000008 r13 0xffff80001d3ffe20 r14 0x100 r15 0x1 rip 0xffffffff81d83d38 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d3ffe00 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=228809 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=75, nice=20 forw=0xffffffffffffffff, list=0xffff80001d351288,0xffffffff82581dc8 process=0xffff8000ffff9940 user=0xffff80001d3fb000, vmspace=0xfffffd80531ed340 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 72016 254952 651 0 2 0 syz-executor.0 *72016 228809 651 0 7 0x4000000 syz-executor.0 54798 403106 0 0 3 0x14200 bored sosplice 83034 226773 43603 0 2 0x2 syz-executor.1 651 48130 43603 0 3 0x82 nanosleep syz-executor.0 43603 484434 53098 0 3 0x82 thrsleep syz-fuzzer 43603 121686 53098 0 3 0x4000082 nanosleep syz-fuzzer 43603 196055 53098 0 3 0x4000082 thrsleep syz-fuzzer 43603 444104 53098 0 3 0x4000082 thrsleep syz-fuzzer 43603 412244 53098 0 3 0x4000082 thrsleep syz-fuzzer 43603 271220 53098 0 3 0x4000082 kqread syz-fuzzer 43603 351680 53098 0 3 0x4000082 thrsleep syz-fuzzer 53098 197825 41061 0 3 0x10008a pause ksh 41061 482910 9062 0 3 0x92 select sshd 76753 111760 1 0 3 0x100083 ttyin getty 9062 357421 1 0 3 0x80 select sshd 97562 497689 20446 73 3 0x100090 kqread syslogd 20446 335045 1 0 3 0x100082 netio syslogd 66087 494957 1 77 3 0x100090 poll dhclient 72035 110932 1 0 3 0x80 poll dhclient 30165 331537 0 0 3 0x14200 bored smr 97863 143848 0 0 2 0x14200 zerothread 54101 110083 0 0 3 0x14200 aiodoned aiodoned 15225 165165 0 0 3 0x14200 syncer update 6328 246696 0 0 3 0x14200 cleaner cleaner 41432 329968 0 0 3 0x14200 reaper reaper 40202 508256 0 0 3 0x14200 pgdaemon pagedaemon 37029 422496 0 0 3 0x14200 bored crynlk 75120 161088 0 0 3 0x14200 bored crypto 87468 234471 0 0 3 0x40014200 acpi0 acpi0 64950 428668 0 0 3 0x14200 bored softnet 11657 481970 0 0 3 0x14200 bored systqmp 62531 186816 0 0 3 0x14200 bored systq 1291 364798 0 0 3 0x40014200 bored softclock 83145 322354 0 0 3 0x40014200 idle0 1 350546 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 9515 6349K 7062K 78643K 11344 0 pcb 16 8K 8K 78643K 92 0 rtable 91 2K 3K 78643K 273 0 ifaddr 86 16K 16K 78643K 125 0 counters 21 16K 16K 78643K 27 0 ioctlops 0 0K 2K 78643K 34 0 iov 0 0K 16K 78643K 78 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1455 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 1K 78643K 2 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 34 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 331 0 sigio 0 0K 0K 78643K 4 0 proc 49 38K 54K 78643K 393 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 521 0 in_multi 64 3K 3K 78643K 137 0 ether_multi 2 0K 0K 78643K 18 0 mrt 0 0K 0K 78643K 5 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 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 110 102K 102K 78643K 1617 0 UVM aobj 18 2K 2K 78643K 20 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 83 0 NDP 14 0K 0K 78643K 24 0 temp 116 3033K 3112K 78643K 9008 0 kqueue 3 4K 18K 78643K 55 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 41 0 39 1 0 1 1 0 8 0 rtentry 112 49 0 12 2 0 2 2 0 8 0 unpcb 120 475 0 467 1 0 1 1 0 8 0 syncache 264 6 0 6 2 2 0 1 0 8 0 tcpqe 32 316 0 316 2 2 0 1 0 8 0 tcpcb 544 406 0 399 3 1 2 2 0 8 1 ipq 40 6 0 6 2 2 0 1 0 8 0 ipqe 40 12 0 12 2 2 0 1 0 8 0 inpcb 280 759 0 745 2 0 2 2 0 8 1 rttmr 72 2 0 2 1 0 1 1 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 196 0 41 13 0 13 13 0 8 1 art_table 32 198 0 41 2 0 2 2 0 8 0 art_node 16 48 0 17 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 7 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 30 0 20 1 0 1 1 0 8 0 shmpl 112 18 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1893 0 496 46 0 46 46 0 8 0 ffsino 240 1893 0 496 83 0 83 83 0 8 0 nchpl 144 2552 0 942 60 0 60 60 0 8 0 uvmvnodes 72 2102 0 0 39 0 39 39 0 8 0 vnodes 208 2102 0 0 111 0 111 111 0 8 0 namei 1024 6650 0 6650 1 0 1 1 0 8 1 vcpupl 1984 7 0 0 1 0 1 1 0 8 0 vmpool 528 12 0 5 2 1 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 7481 0 7481 1 0 1 1 0 8 1 plimitpl 152 41 0 34 1 0 1 1 0 8 0 sigapl 424 520 0 491 4 0 4 4 0 8 0 futexpl 56 6997 0 6997 1 0 1 1 0 8 1 knotepl 112 114 0 95 1 0 1 1 0 8 0 kqueuepl 144 64 0 62 1 0 1 1 0 8 0 pipelkpl 16 116 0 106 1 0 1 1 0 8 0 pipepl 120 232 0 213 1 0 1 1 0 8 0 fdescpl 432 503 0 489 2 0 2 2 0 8 0 filepl 120 3426 0 3327 4 0 4 4 0 8 1 lockfpl 104 85 0 84 1 0 1 1 0 8 0 lockfspl 48 31 0 30 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 96 233 0 226 1 0 1 1 0 8 0 zombiepl 144 491 0 491 1 0 1 1 0 8 1 processpl 920 520 0 491 4 0 4 4 0 8 0 procpl 624 926 0 890 4 0 4 4 0 8 0 sosppl 128 6 0 6 2 1 1 1 0 8 1 sockpl 400 1277 0 1255 5 1 4 5 0 8 1 mcl64k 65536 43 0 43 1 0 1 1 0 8 1 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 9 0 9 1 0 1 1 0 8 1 mcl9k 9216 2 0 2 2 2 0 1 0 8 0 mcl8k 8192 10 0 10 1 1 0 1 0 8 0 mcl4k 4096 23 0 23 2 1 1 1 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 60921 0 60858 19 10 9 16 0 8 0 mtagpl 80 38 0 2 2 1 1 1 0 8 0 mbufpl 256 100025 0 99836 15 2 13 14 0 8 0 bufpl 280 4595 0 164 317 0 317 317 0 8 0 anonpl 16 54461 0 40511 61 3 58 58 0 107 1 amapchunkpl 152 2113 0 1968 8 1 7 8 0 158 0 amappl16 192 2246 0 1487 40 0 40 40 0 8 2 amappl15 184 156 0 154 1 0 1 1 0 8 0 amappl14 176 4 0 2 2 1 1 1 0 8 0 amappl13 168 27 0 25 1 0 1 1 0 8 0 amappl12 160 1 0 1 1 1 0 1 0 8 0 amappl11 152 63 0 51 1 0 1 1 0 8 0 amappl10 144 157 0 151 1 0 1 1 0 8 0 amappl9 136 379 0 375 1 0 1 1 0 8 0 amappl8 128 267 0 255 1 0 1 1 0 8 0 amappl7 120 251 0 239 1 0 1 1 0 8 0 amappl6 112 20 0 18 1 0 1 1 0 8 0 amappl5 104 443 0 431 1 0 1 1 0 8 0 amappl4 96 448 0 414 2 1 1 2 0 8 0 amappl3 88 112 0 107 1 0 1 1 0 8 0 amappl2 80 3392 0 3327 3 1 2 3 0 8 0 amappl1 72 18554 0 18145 24 15 9 20 0 8 0 amappl 80 1155 0 1106 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 19 0 2 1 0 1 1 0 8 0 uaddrrnd 24 515 0 494 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 515 0 494 1 0 1 1 0 8 0 vmmpekpl 168 7174 0 7144 2 0 2 2 0 8 0 vmmpepl 168 65934 0 64102 104 18 86 101 0 357 4 vmsppl 272 514 0 494 3 1 2 2 0 8 0 pdppl 4096 1036 0 995 7 1 6 6 0 8 0 pvpl 32 181097 0 164521 145 2 143 143 0 265 8 pmappl 200 514 0 494 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 165 0 21 5 0 5 5 0 8 0