panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *198147 37710 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82248e20) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805ab04f00,30,8,fffffd805ab04c20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805ab04f00,30,8,fffffd805ab04c20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805ab04f00,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805ffa8118,fffffd805ab04f00,ffff80002065d8f0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80002065db48,ffff80002065db54,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80002065db48,ffff80002065db54,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80002065db48,ffff80002065db54,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805ab04f00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805ab04f00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805ab04e00,ffff800000a04f00,fffffd805ffa82a0,0,0,fffffd805ffa8230) at ip6_output+0xd02 rip6_output(fffffd805ab04e00,fffffd8060fecc90,ffff80002065deb0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8060fecc90,9,fffffd805ab04e00,0,0,ffff80001d35e128) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8060fecc90,0,ffff80002065e0f8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80002065e0e0, 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(ffffffff82248e20) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805ab04f00,30,8,fffffd805ab04c20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805ab04f00,30,8,fffffd805ab04c20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805ab04f00,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805ffa8118,fffffd805ab04f00,ffff80002065d8f0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80002065db48,ffff80002065db54,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80002065db48,ffff80002065db54,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80002065db48,ffff80002065db54,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805ab04f00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805ab04f00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805ab04e00,ffff800000a04f00,fffffd805ffa82a0,0,0,fffffd805ffa8230) at ip6_output+0xd02 rip6_output(fffffd805ab04e00,fffffd8060fecc90,ffff80002065deb0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8060fecc90,9,fffffd805ab04e00,0,0,ffff80001d35e128) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8060fecc90,0,ffff80002065e0f8,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d35e128,6,ffff80002065e0f8,0,ffff80002065e1e0) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d35e128,ffff80002065e198,ffff80002065e1e0) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80002065e260) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x55905cbb340, count: -18 ddb> show registers rdi 0xffffffff818dd117 db_enter+0x17 rsi 0x1139 __ALIGN_SIZE+0x139 rbp 0xffff80002065d660 rbx 0xffff80002065d710 rdx 0x113a __ALIGN_SIZE+0x13a rcx 0xffff80001f639000 rax 0xffff80001f639000 r8 0xffff80002065d620 r9 0x1 r10 0xffff8000009f6040 r11 0x2d8a377e699d8d98 r12 0x3000000008 r13 0xffff80002065d670 r14 0x100 r15 0x1 rip 0xffffffff818dd118 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002065d650 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=198147 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=63, nice=20 forw=0xffffffffffffffff, list=0xffff80001d35d018,0xffff80001d35d778 process=0xffff8000ffffbc10 user=0xffff800020659000, vmspace=0xfffffd806bc09880 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 37710 461922 35676 0 2 0 syz-executor.1 *37710 198147 35676 0 7 0x4000000 syz-executor.1 8471 48987 33830 0 3 0x80 nanosleep syz-executor.0 8471 313229 33830 0 3 0x4000080 msgwait syz-executor.0 8471 391971 33830 0 3 0x4000080 fsleep syz-executor.0 8471 174353 33830 0 3 0x4000080 fsleep syz-executor.0 95891 370470 0 0 3 0x14200 bored sosplice 35676 191888 52147 0 3 0x82 nanosleep syz-executor.1 33830 419276 52147 0 3 0x82 nanosleep syz-executor.0 52147 339718 81933 0 3 0x82 thrsleep syz-fuzzer 52147 41072 81933 0 3 0x4000082 thrsleep syz-fuzzer 52147 401652 81933 0 3 0x4000082 thrsleep syz-fuzzer 52147 486166 81933 0 3 0x4000082 thrsleep syz-fuzzer 52147 13754 81933 0 3 0x4000082 thrsleep syz-fuzzer 52147 51221 81933 0 3 0x4000082 thrsleep syz-fuzzer 52147 247332 81933 0 3 0x4000082 thrsleep syz-fuzzer 52147 408237 81933 0 3 0x4000082 kqread syz-fuzzer 81933 500657 36871 0 3 0x10008a pause ksh 36871 482998 84724 0 3 0x92 select sshd 73075 326675 1 0 3 0x100083 ttyin getty 84724 274024 1 0 3 0x80 select sshd 63881 210246 51511 73 3 0x100090 kqread syslogd 51511 155494 1 0 3 0x100082 netio syslogd 39370 71761 1 77 3 0x100090 poll dhclient 58549 459877 1 0 3 0x80 poll dhclient 30982 44230 0 0 3 0x14200 bored smr 16706 356877 0 0 2 0x14200 zerothread 91284 489422 0 0 3 0x14200 aiodoned aiodoned 71042 203966 0 0 3 0x14200 syncer update 10874 334620 0 0 3 0x14200 cleaner cleaner 89573 16925 0 0 3 0x14200 reaper reaper 53475 474141 0 0 3 0x14200 pgdaemon pagedaemon 49213 323890 0 0 3 0x14200 bored crynlk 25366 261832 0 0 3 0x14200 bored crypto 92866 79819 0 0 3 0x40014200 acpi0 acpi0 41018 106732 0 0 3 0x14200 bored softnet 84732 294758 0 0 3 0x14200 bored systqmp 2126 490064 0 0 3 0x14200 bored systq 29440 101589 0 0 3 0x40014200 bored softclock 41488 279046 0 0 3 0x40014200 idle0 1 234960 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 9469 6349K 6593K 78643K 10669 0 pcb 16 8K 8K 78643K 44 0 rtable 107 3K 3K 78643K 201 0 ifaddr 48 11K 11K 78643K 56 0 counters 21 16K 16K 78643K 22 0 ioctlops 0 0K 2K 78643K 23 0 iov 0 0K 16K 78643K 20 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1255 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 36 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 99 0 sigio 0 0K 0K 78643K 2 0 proc 49 38K 63K 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 12 0 in_multi 35 2K 2K 78643K 40 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 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 185 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 108 21K 25K 78643K 1073 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 11 0 NDP 7 0K 0K 78643K 12 0 temp 83 3014K 3078K 78643K 2404 0 kqueue 3 4K 9K 78643K 9 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 21 0 19 1 0 1 1 0 8 0 rtentry 112 46 0 1 2 0 2 2 0 8 0 unpcb 120 61 0 50 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 97 0 97 1 0 1 1 0 8 1 tcpcb 544 34 0 28 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 46 0 46 1 0 1 1 0 8 1 inpcb 280 127 0 115 2 0 2 2 0 8 1 nd6 48 7 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 190 0 0 12 0 12 12 0 8 0 art_table 32 191 0 0 2 0 2 2 0 8 0 art_node 16 45 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 17 0 15 1 0 1 1 0 8 0 semapl 112 34 0 24 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 1520 0 119 46 0 46 46 0 8 0 ffsino 240 1520 0 119 83 0 83 83 0 8 0 nchpl 144 1853 0 241 60 0 60 60 0 8 0 uvmvnodes 72 1587 0 0 29 0 29 29 0 8 0 vnodes 208 1587 0 0 84 0 84 84 0 8 0 namei 1024 4747 0 4747 1 0 1 1 0 8 1 scxspl 192 5598 0 5598 1 0 1 1 0 8 1 plimitpl 152 21 0 14 1 0 1 1 0 8 0 sigapl 424 286 0 256 4 0 4 4 0 8 0 futexpl 56 2155 0 2153 1 0 1 1 0 8 0 knotepl 112 57 0 38 1 0 1 1 0 8 0 kqueuepl 144 20 0 18 1 0 1 1 0 8 0 pipelkpl 16 94 0 83 1 0 1 1 0 8 0 pipepl 120 188 0 167 2 0 2 2 0 8 1 fdescpl 432 271 0 256 2 0 2 2 0 8 0 filepl 120 1624 0 1517 4 0 4 4 0 8 0 lockfpl 104 52 0 51 1 0 1 1 0 8 0 lockfspl 48 17 0 16 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 96 143 0 135 1 0 1 1 0 8 0 zombiepl 144 256 0 256 1 0 1 1 0 8 1 processpl 896 286 0 256 4 0 4 4 0 8 0 procpl 624 390 0 349 4 0 4 4 0 8 0 sockpl 400 209 0 184 4 0 4 4 0 8 1 mcl64k 65536 17 0 17 1 0 1 1 0 8 1 mcl16k 16384 3 0 3 1 0 1 1 0 8 1 mcl12k 12288 6 0 6 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 0 1 1 0 8 1 mcl4k 4096 18 0 18 2 1 1 1 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 65017 0 64967 16 2 14 14 0 8 7 mtagpl 80 6 0 2 2 1 1 1 0 8 0 mbufpl 256 103562 0 103476 19 2 17 17 0 8 9 bufpl 280 4219 0 164 290 0 290 290 0 8 0 anonpl 16 41362 0 24669 70 2 68 68 0 107 0 amapchunkpl 152 1229 0 1089 7 0 7 7 0 158 1 amappl16 192 1308 0 384 47 0 47 47 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 2 0 1 2 1 1 1 0 8 0 amappl13 168 33 0 30 1 0 1 1 0 8 0 amappl12 160 11 0 9 1 0 1 1 0 8 0 amappl11 152 94 0 80 1 0 1 1 0 8 0 amappl10 144 50 0 44 1 0 1 1 0 8 0 amappl9 136 381 0 377 1 0 1 1 0 8 0 amappl8 128 270 0 250 1 0 1 1 0 8 0 amappl7 120 138 0 125 1 0 1 1 0 8 0 amappl6 112 53 0 50 1 0 1 1 0 8 0 amappl5 104 205 0 193 1 0 1 1 0 8 0 amappl4 96 444 0 415 1 0 1 1 0 8 0 amappl3 88 112 0 105 1 0 1 1 0 8 0 amappl2 80 1366 0 1293 3 1 2 3 0 8 0 amappl1 72 14765 0 14331 27 14 13 20 0 8 4 amappl 80 610 0 565 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 24 271 0 256 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 271 0 256 1 0 1 1 0 8 0 vmmpekpl 168 6027 0 6003 2 0 2 2 0 8 0 vmmpepl 168 39853 0 37758 117 7 110 110 0 357 18 vmsppl 272 270 0 256 2 0 2 2 0 8 1 pdppl 4096 548 0 512 6 0 6 6 0 8 1 pvpl 32 139679 0 119927 160 0 160 160 0 265 0 pmappl 200 270 0 256 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 159 0 7 5 0 5 5 0 8 0