panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *199359 16617 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224fbe8) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805a406500,30,8,fffffd805a406720) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805a406500,30,8,fffffd805a406720) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805a406500,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e566000,fffffd805a406500,ffff80001d403dd0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d404028,ffff80001d404034,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d404028,ffff80001d404034,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d404028,ffff80001d404034,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805a406500) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805a406500,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805a406900,ffff800000a07180,fffffd805e566700,0,0,fffffd805e566690) at ip6_output+0xd02 rip6_output(fffffd805a406900,fffffd805709fe28,ffff80001d404390,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805709fe28,9,fffffd805a406900,0,0,ffff80001d339008) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805709fe28,0,ffff80001d4045d8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001d4045c0, 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(ffffffff8224fbe8) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805a406500,30,8,fffffd805a406720) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805a406500,30,8,fffffd805a406720) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805a406500,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e566000,fffffd805a406500,ffff80001d403dd0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d404028,ffff80001d404034,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d404028,ffff80001d404034,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d404028,ffff80001d404034,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805a406500) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805a406500,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805a406900,ffff800000a07180,fffffd805e566700,0,0,fffffd805e566690) at ip6_output+0xd02 rip6_output(fffffd805a406900,fffffd805709fe28,ffff80001d404390,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805709fe28,9,fffffd805a406900,0,0,ffff80001d339008) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805709fe28,0,ffff80001d4045d8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d339008,6,ffff80001d4045d8,0,ffff80001d4046c0) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d339008,ffff80001d404678,ffff80001d4046c0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001d404740) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xc1f1cd48f20, count: -18 ddb> show registers rdi 0xffffffff81b54ed7 db_enter+0x17 rsi 0x10ae __ALIGN_SIZE+0xae rbp 0xffff80001d403b40 rbx 0xffff80001d403bf0 rdx 0x10af __ALIGN_SIZE+0xaf rcx 0xffff80001e433000 rax 0xffff80001e433000 r8 0xffff80001d403b00 r9 0x1 r10 0xffff8000009f8080 r11 0xb0cb530e3b64730a r12 0x3000000008 r13 0xffff80001d403b50 r14 0x100 r15 0x1 rip 0xffffffff81b54ed8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d403b30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=199359 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=69, nice=20 forw=0xffffffffffffffff, list=0xffff80001d339278,0xffffffff82585c68 process=0xffff8000ffffb5a0 user=0xffff80001d3ff000, vmspace=0xfffffd8057886008 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 16617 459364 60757 0 2 0 syz-executor.1 *16617 199359 60757 0 7 0x4000000 syz-executor.1 36798 245327 89260 0 2 0x2 syz-executor.0 60757 28493 89260 0 3 0x82 nanosleep syz-executor.1 89260 484448 2063 0 3 0x82 thrsleep syz-fuzzer 89260 495349 2063 0 3 0x4000082 thrsleep syz-fuzzer 89260 83730 2063 0 3 0x4000082 thrsleep syz-fuzzer 89260 52202 2063 0 3 0x4000082 thrsleep syz-fuzzer 89260 523412 2063 0 3 0x4000082 thrsleep syz-fuzzer 89260 443571 2063 0 3 0x4000082 kqread syz-fuzzer 89260 4416 2063 0 3 0x4000082 thrsleep syz-fuzzer 2063 211452 10601 0 3 0x10008a pause ksh 10601 240024 67493 0 3 0x92 select sshd 33783 278516 1 0 3 0x100083 ttyin getty 67493 102149 1 0 3 0x80 select sshd 6307 13761 22668 73 3 0x100090 kqread syslogd 22668 74292 1 0 3 0x100082 netio syslogd 13275 99251 1 77 3 0x100090 poll dhclient 2011 195800 1 0 3 0x80 poll dhclient 50023 508237 0 0 3 0x14200 bored smr 15150 371126 0 0 2 0x14200 zerothread 27465 171149 0 0 3 0x14200 aiodoned aiodoned 32970 501717 0 0 3 0x14200 syncer update 22934 257444 0 0 3 0x14200 cleaner cleaner 32018 288888 0 0 3 0x14200 reaper reaper 63790 102582 0 0 3 0x14200 pgdaemon pagedaemon 21422 421698 0 0 3 0x14200 bored crynlk 94515 130836 0 0 3 0x14200 bored crypto 15511 221907 0 0 3 0x40014200 acpi0 acpi0 58853 58224 0 0 3 0x14200 bored softnet 5794 317685 0 0 3 0x14200 bored systqmp 74063 509218 0 0 3 0x14200 bored systq 8156 22453 0 0 3 0x40014200 bored softclock 97370 378769 0 0 3 0x40014200 idle0 1 286333 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 9484 6336K 6713K 78643K 10706 0 pcb 16 8K 8K 78643K 40 0 rtable 105 3K 3K 78643K 198 0 ifaddr 58 12K 12K 78643K 63 0 counters 21 16K 16K 78643K 21 0 ioctlops 0 0K 2K 78643K 31 0 iov 0 0K 18K 78643K 17 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1268 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 3 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 16 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 133 0 sigio 0 0K 0K 78643K 6 0 proc 50 38K 54K 78643K 372 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 5 0 in_multi 42 2K 2K 78643K 48 0 ether_multi 2 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 181 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 102 102K 102K 78643K 1122 0 UVM aobj 6 2K 2K 78643K 6 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 14 0 NDP 9 0K 0K 78643K 13 0 temp 81 3029K 3108K 78643K 3496 0 kqueue 3 4K 8K 78643K 12 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 25 0 23 1 0 1 1 0 8 0 rtentry 112 45 0 1 2 0 2 2 0 8 0 unpcb 120 211 0 203 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 27 0 27 1 0 1 1 0 8 1 tcpcb 544 34 0 28 1 0 1 1 0 8 0 ipq 40 4 0 4 1 0 1 1 0 8 1 ipqe 40 96 0 96 1 0 1 1 0 8 1 inpcb 280 132 0 121 1 0 1 1 0 8 0 nd6 48 6 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 189 0 0 12 0 12 12 0 8 0 art_table 32 190 0 0 2 0 2 2 0 8 0 art_node 16 44 0 4 1 0 1 1 0 8 0 semupl 112 4 0 4 1 0 1 1 0 8 1 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 4 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1576 0 175 46 0 46 46 0 8 0 ffsino 240 1576 0 175 83 0 83 83 0 8 0 nchpl 144 1976 0 366 60 0 60 60 0 8 0 uvmvnodes 72 1655 0 0 31 0 31 31 0 8 0 vnodes 208 1655 0 0 88 0 88 88 0 8 0 namei 1024 4940 0 4940 1 0 1 1 0 8 1 vcpupl 1984 8 0 0 1 0 1 1 0 8 0 vmpool 528 8 0 0 1 0 1 1 0 8 0 scxspl 192 5581 0 5581 1 0 1 1 0 8 1 plimitpl 152 19 0 12 1 0 1 1 0 8 0 sigapl 424 319 0 291 4 0 4 4 0 8 0 futexpl 56 2387 0 2387 1 0 1 1 0 8 1 knotepl 112 67 0 48 1 0 1 1 0 8 0 kqueuepl 144 20 0 18 1 0 1 1 0 8 0 pipelkpl 16 89 0 79 1 0 1 1 0 8 0 pipepl 120 178 0 159 1 0 1 1 0 8 0 fdescpl 432 305 0 291 2 0 2 2 0 8 0 filepl 120 1830 0 1731 4 0 4 4 0 8 1 lockfpl 104 22 0 21 1 0 1 1 0 8 0 lockfspl 48 9 0 8 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 96 129 0 122 1 0 1 1 0 8 0 zombiepl 144 291 0 291 1 0 1 1 0 8 1 processpl 920 319 0 291 4 0 4 4 0 8 0 procpl 624 441 0 406 4 0 4 4 0 8 1 sockpl 400 368 0 347 4 0 4 4 0 8 1 mcl64k 65536 14 0 14 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 2 0 2 1 0 1 1 0 8 1 mcl4k 4096 17 0 17 2 1 1 1 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 63219 0 63179 12 1 11 11 0 8 5 mtagpl 80 4 0 2 2 1 1 1 0 8 0 mbufpl 256 100500 0 100421 16 1 15 16 0 8 8 bufpl 280 4163 0 161 286 0 286 286 0 8 0 anonpl 16 40581 0 26545 60 2 58 58 0 107 0 amapchunkpl 152 1239 0 1103 7 0 7 7 0 158 0 amappl16 192 1357 0 568 40 0 40 40 0 8 0 amappl15 184 2 0 1 1 0 1 1 0 8 0 amappl14 176 5 0 3 2 1 1 1 0 8 0 amappl13 168 31 0 29 1 0 1 1 0 8 0 amappl12 160 3 0 3 1 1 0 1 0 8 0 amappl11 152 62 0 50 1 0 1 1 0 8 0 amappl10 144 65 0 59 1 0 1 1 0 8 0 amappl9 136 380 0 377 1 0 1 1 0 8 0 amappl8 128 258 0 247 1 0 1 1 0 8 0 amappl7 120 158 0 147 1 0 1 1 0 8 0 amappl6 112 22 0 20 1 0 1 1 0 8 0 amappl5 104 238 0 226 1 0 1 1 0 8 0 amappl4 96 437 0 409 1 0 1 1 0 8 0 amappl3 88 110 0 104 1 0 1 1 0 8 0 amappl2 80 1619 0 1552 3 1 2 3 0 8 0 amappl1 72 15170 0 14750 26 13 13 20 0 8 4 amappl 80 672 0 626 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 5 0 0 1 0 1 1 0 8 0 uaddrrnd 24 313 0 291 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 313 0 291 1 0 1 1 0 8 0 vmmpekpl 168 6005 0 5977 2 0 2 2 0 8 0 vmmpepl 168 43055 0 41192 136 6 130 130 0 357 48 vmsppl 272 312 0 291 2 0 2 2 0 8 0 pdppl 4096 632 0 590 6 0 6 6 0 8 0 pvpl 32 139712 0 122994 141 0 141 141 0 265 3 pmappl 200 312 0 291 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 152 0 5 5 0 5 5 0 8 0