panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 95016 31307 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822236a7) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8057ab6d00,40,8,fffffd806bc22a20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8057ab6d00,40,8,fffffd806bc22a20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8057ab6d00,40,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd8062b0c9d8,fffffd8057ab6d00,ffff80001d407f50) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001d4081a8,ffff80001d4081b4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d4081a8,ffff80001d4081b4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d4081a8,ffff80001d4081b4,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd8057ab6d00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd8057ab6d00,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd8055419800,ffff800000a01b00,fffffd8062b0cb60,0,0,fffffd8062b0caf0) at ip6_output+0xd02 rip6_output(fffffd8055419d00,fffffd805d8f0788,ffff80001d408510,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805d8f0788,9,fffffd8055419d00,0,0,ffff80001e441b40) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805d8f0788,0,ffff80001d408758,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 end trace frame: 0xffff80001d408740, 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(ffffffff822236a7) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8057ab6d00,40,8,fffffd806bc22a20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8057ab6d00,40,8,fffffd806bc22a20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8057ab6d00,40,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd8062b0c9d8,fffffd8057ab6d00,ffff80001d407f50) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001d4081a8,ffff80001d4081b4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d4081a8,ffff80001d4081b4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d4081a8,ffff80001d4081b4,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd8057ab6d00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd8057ab6d00,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd8055419800,ffff800000a01b00,fffffd8062b0cb60,0,0,fffffd8062b0caf0) at ip6_output+0xd02 rip6_output(fffffd8055419d00,fffffd805d8f0788,ffff80001d408510,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805d8f0788,9,fffffd8055419d00,0,0,ffff80001e441b40) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805d8f0788,0,ffff80001d408758,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff80001e441b40,4,ffff80001d408758,0,ffff80001d408840) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff80001e441b40,ffff80001d4087f8,ffff80001d408840) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001d4088c0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xafb90c18ee0, count: -18 ddb> show registers rdi 0xffffffff81aa31d7 db_enter+0x17 rsi 0x11c3 __ALIGN_SIZE+0x1c3 rbp 0xffff80001d407cc0 rbx 0xffff80001d407d70 rdx 0x11c4 __ALIGN_SIZE+0x1c4 rcx 0xffff80002063f000 rax 0xffff80002063f000 r8 0xffff80001d407c80 r9 0x1 r10 0xffff8000009f1840 r11 0xb64e77776f97cb25 r12 0x3000000008 r13 0xffff80001d407cd0 r14 0x100 r15 0x1 rip 0xffffffff81aa31d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d407cb0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=95016 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001e441650,0xffffffff825475d0 process=0xffff8000ffff6378 user=0xffff80001d403000, vmspace=0xfffffd806bc0aaa0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 31307 433278 40186 0 2 0 syz-executor.1 *31307 95016 40186 0 7 0x4000000 syz-executor.1 40186 350867 66090 0 3 0x82 nanosleep syz-executor.1 54794 18853 0 0 3 0x14200 acct acct 59193 370606 0 0 3 0x14200 bored sosplice 62652 295700 66090 0 2 0x2 syz-executor.0 66090 337134 36559 0 3 0x82 thrsleep syz-fuzzer 66090 247597 36559 0 3 0x4000082 nanosleep syz-fuzzer 66090 122643 36559 0 3 0x4000082 thrsleep syz-fuzzer 66090 73149 36559 0 3 0x4000082 thrsleep syz-fuzzer 66090 88430 36559 0 3 0x4000082 thrsleep syz-fuzzer 66090 362591 36559 0 3 0x4000082 kqread syz-fuzzer 66090 275527 36559 0 3 0x4000082 thrsleep syz-fuzzer 66090 426514 36559 0 3 0x4000082 thrsleep syz-fuzzer 36559 333074 68126 0 3 0x10008a pause ksh 68126 494972 64930 0 3 0x92 select sshd 98235 4883 1 0 3 0x100083 ttyin getty 64930 277685 1 0 3 0x80 select sshd 23251 519922 49010 73 3 0x100090 kqread syslogd 49010 160 1 0 3 0x100082 netio syslogd 18100 430545 1 77 3 0x100090 poll dhclient 92454 301365 1 0 3 0x80 poll dhclient 48100 54970 0 0 2 0x14200 zerothread 62488 234461 0 0 3 0x14200 aiodoned aiodoned 26001 212120 0 0 3 0x14200 syncer update 34968 165332 0 0 3 0x14200 cleaner cleaner 36129 442372 0 0 3 0x14200 reaper reaper 27147 106159 0 0 3 0x14200 pgdaemon pagedaemon 32280 521051 0 0 3 0x14200 bored crynlk 57731 39124 0 0 3 0x14200 bored crypto 46653 288120 0 0 3 0x40014200 acpi0 acpi0 6136 489733 0 0 3 0x14200 bored softnet 307 254194 0 0 3 0x14200 bored systqmp 98510 294794 0 0 3 0x14200 bored systq 54913 440490 0 0 3 0x40014200 bored softclock 88052 467631 0 0 3 0x40014200 idle0 34269 197142 0 0 3 0x14200 bored smr 1 68256 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 9533 6614K 6930K 78643K 11318 0 pcb 15 8K 8K 78643K 118 0 rtable 113 4K 4K 78643K 399 0 ifaddr 79 15K 16K 78643K 161 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 30 0 iov 0 0K 12K 78643K 64 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1492 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 8 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 150 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 341 0 sigio 0 0K 0K 78643K 4 0 proc 48 38K 54K 78643K 459 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 0 0K 0K 78643K 18 0 in_multi 62 3K 3K 78643K 85 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 55 254K 254K 78643K 55 0 exec 0 0K 1K 78643K 237 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 116 22K 42K 78643K 1712 0 UVM aobj 11 2K 2K 78643K 15 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 114 0 NDP 13 0K 0K 78643K 34 0 temp 133 3018K 3084K 78643K 18508 0 kqueue 0 0K 0K 78643K 4 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 11 0 4 1 0 1 1 0 8 0 rtpcb 80 53 0 51 1 0 1 1 0 8 0 rtentry 112 68 0 23 2 0 2 2 0 8 0 unpcb 120 196 0 188 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 59 0 59 1 1 0 1 0 8 0 tcpcb 544 139 0 134 2 0 2 2 0 8 1 ipq 40 3 0 3 1 1 0 1 0 8 0 ipqe 40 8 0 8 1 1 0 1 0 8 0 inpcb 280 501 0 492 4 1 3 4 0 8 2 nd6 48 8 0 4 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 0 1 1 0 8 1 swfcl 56 2 0 0 1 0 1 1 0 8 0 ppxss 1128 11 0 11 2 1 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 308 0 92 14 0 14 14 0 8 0 art_table 32 309 0 92 2 0 2 2 0 8 0 art_node 16 67 0 26 1 0 1 1 0 8 0 sysvmsgpl 40 23 0 14 1 0 1 1 0 8 0 semapl 112 148 0 138 1 0 1 1 0 8 0 shmpl 112 13 0 4 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1909 0 507 46 0 46 46 0 8 0 ffsino 240 1909 0 507 83 0 83 83 0 8 0 nchpl 144 2725 0 1123 60 0 60 60 0 8 0 uvmvnodes 72 2132 0 0 39 0 39 39 0 8 0 vnodes 208 2132 0 0 113 0 113 113 0 8 0 namei 1024 7578 0 7577 1 0 1 1 0 8 0 vmpool 528 6 0 6 2 1 1 1 0 8 1 scxspl 192 7399 0 7399 1 0 1 1 0 8 1 plimitpl 152 34 0 27 1 0 1 1 0 8 0 sigapl 432 506 0 493 2 0 2 2 0 8 0 futexpl 56 9121 0 9121 1 0 1 1 0 8 1 knotepl 112 108 0 89 1 0 1 1 0 8 0 kqueuepl 104 166 0 164 1 0 1 1 0 8 0 pipepl 112 322 0 303 2 1 1 2 0 8 0 fdescpl 424 507 0 493 2 0 2 2 0 8 0 filepl 120 3956 0 3859 6 2 4 5 0 8 1 lockfpl 104 115 0 114 1 0 1 1 0 8 0 lockfspl 48 38 0 37 1 0 1 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 21 0 11 1 0 1 1 0 8 0 ucredpl 96 383 0 374 1 0 1 1 0 8 0 zombiepl 144 493 0 493 1 0 1 1 0 8 1 processpl 872 523 0 493 4 0 4 4 0 8 0 procpl 632 911 0 873 4 0 4 4 0 8 0 sosppl 128 7 0 7 2 2 0 1 0 8 0 sockpl 384 770 0 751 6 1 5 6 0 8 3 mcl64k 65536 49 0 49 1 0 1 1 0 8 1 mcl16k 16384 4 0 4 3 3 0 1 0 8 0 mcl12k 12288 20 0 20 1 0 1 1 0 8 1 mcl9k 9216 6 0 6 3 2 1 1 0 8 1 mcl8k 8192 9 0 9 3 2 1 1 0 8 1 mcl4k 4096 42 0 42 2 1 1 1 0 8 1 mcl2k2 2112 3 0 3 2 2 0 1 0 8 0 mcl2k 2048 69077 0 69032 17 10 7 13 0 8 0 mtagpl 80 4 0 4 2 2 0 1 0 8 0 mbufpl 256 111712 0 111646 11 5 6 9 0 8 0 bufpl 280 6904 0 1330 399 0 399 399 0 8 0 anonpl 16 81302 0 62209 94 13 81 92 0 107 4 amapchunkpl 152 2948 0 2798 21 11 10 16 0 158 4 amappl16 192 2651 0 1603 63 10 53 63 0 8 0 amappl15 184 56 0 51 1 0 1 1 0 8 0 amappl14 176 37 0 35 1 0 1 1 0 8 0 amappl13 168 126 0 124 1 0 1 1 0 8 0 amappl12 160 5 0 3 1 0 1 1 0 8 0 amappl11 152 231 0 217 1 0 1 1 0 8 0 amappl10 144 13 0 12 1 0 1 1 0 8 0 amappl9 136 590 0 587 1 0 1 1 0 8 0 amappl8 128 136 0 110 1 0 1 1 0 8 0 amappl7 120 103 0 91 1 0 1 1 0 8 0 amappl6 112 205 0 196 1 0 1 1 0 8 0 amappl5 104 160 0 149 1 0 1 1 0 8 0 amappl4 96 729 0 701 1 0 1 1 0 8 0 amappl3 88 139 0 131 1 0 1 1 0 8 0 amappl2 80 3247 0 3174 3 1 2 3 0 8 0 amappl1 72 18958 0 18537 26 16 10 20 0 8 0 amappl 80 1165 0 1121 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 14 0 4 1 0 1 1 0 8 0 uaddrrnd 24 513 0 499 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 513 0 499 1 0 1 1 0 8 0 vmmpekpl 168 7419 0 7392 2 0 2 2 0 8 0 vmmpepl 168 69720 0 67567 148 23 125 133 0 357 30 vmsppl 272 512 0 499 4 2 2 2 0 8 1 pdppl 4096 1032 0 998 6 1 5 6 0 8 0 pvpl 32 224155 0 202020 214 19 195 214 0 265 16 pmappl 200 512 0 499 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 153 0 26 4 0 4 4 0 8 0