panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 89188 95028 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82223a7b) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805e4b1200,48,8,fffffd8064bfb120) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805e4b1200,48,8,fffffd8064bfb120) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805e4b1200,48,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4dc578,fffffd805e4b1200,ffff80001f64fa20) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001f64fc78,ffff80001f64fc84,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001f64fc78,ffff80001f64fc84,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001f64fc78,ffff80001f64fc84,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd805e4b1200) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd805e4b1200,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd805e4b1a00,ffff8000009d7e00,fffffd805e4dca48,0,0,fffffd805e4dc9d8) at ip6_output+0xd02 rip6_output(fffffd805e4b1300,fffffd805e4dda80,ffff80001f64ffe0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805e4dda80,9,fffffd805e4b1300,0,0,ffff8000ffff3160) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805e4dda80,0,ffff80001f650228,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 end trace frame: 0xffff80001f650210, 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(ffffffff82223a7b) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805e4b1200,48,8,fffffd8064bfb120) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805e4b1200,48,8,fffffd8064bfb120) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805e4b1200,48,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4dc578,fffffd805e4b1200,ffff80001f64fa20) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001f64fc78,ffff80001f64fc84,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001f64fc78,ffff80001f64fc84,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001f64fc78,ffff80001f64fc84,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd805e4b1200) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd805e4b1200,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd805e4b1a00,ffff8000009d7e00,fffffd805e4dca48,0,0,fffffd805e4dc9d8) at ip6_output+0xd02 rip6_output(fffffd805e4b1300,fffffd805e4dda80,ffff80001f64ffe0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805e4dda80,9,fffffd805e4b1300,0,0,ffff8000ffff3160) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805e4dda80,0,ffff80001f650228,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff8000ffff3160,3,ffff80001f650228,0,ffff80001f650310) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff8000ffff3160,ffff80001f6502c8,ffff80001f650310) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001f650390) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x6eec9c54000, count: -18 ddb> show registers rdi 0xffffffff81c29ac7 db_enter+0x17 rsi 0x11f4 __ALIGN_SIZE+0x1f4 rbp 0xffff80001f64f790 rbx 0xffff80001f64f840 rdx 0x11f5 __ALIGN_SIZE+0x1f5 rcx 0xffff80001d44b000 rax 0xffff80001d44b000 r8 0xffff80001f64f750 r9 0x1 r10 0xffff8000009f1140 r11 0x7c83d18f487c0f6b r12 0x3000000008 r13 0xffff80001f64f7a0 r14 0x100 r15 0x1 rip 0xffffffff81c29ac8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001f64f780 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=89188 stat=onproc flags process=0 proc=4000000 pri=76, usrpri=76, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff29f8,0xffffffff825498a0 process=0xffff8000ffff7480 user=0xffff80001f64b000, vmspace=0xfffffd806bc09dd0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 95028 456779 60988 0 2 0 syz-executor.1 *95028 89188 60988 0 7 0x4000000 syz-executor.1 90563 254564 0 0 3 0x14200 bored sosplice 46318 1415 34027 0 2 0x2 syz-executor.0 60988 243801 34027 0 3 0x82 nanosleep syz-executor.1 34027 446182 5533 0 3 0x82 thrsleep syz-fuzzer 34027 365665 5533 0 3 0x4000082 nanosleep syz-fuzzer 34027 456568 5533 0 3 0x4000082 thrsleep syz-fuzzer 34027 34094 5533 0 3 0x4000082 thrsleep syz-fuzzer 34027 268223 5533 0 3 0x4000082 thrsleep syz-fuzzer 34027 495571 5533 0 3 0x4000082 thrsleep syz-fuzzer 34027 368312 5533 0 3 0x4000082 thrsleep syz-fuzzer 34027 419296 5533 0 3 0x4000082 kqread syz-fuzzer 5533 192867 17459 0 3 0x10008a pause ksh 17459 500236 18017 0 3 0x92 select sshd 45936 495109 1 0 3 0x100083 ttyin getty 18017 473620 1 0 3 0x80 select sshd 58243 70762 42589 73 3 0x100090 kqread syslogd 42589 512582 1 0 3 0x100082 netio syslogd 60938 232481 1 77 3 0x100090 poll dhclient 3462 423512 1 0 3 0x80 poll dhclient 63902 215983 0 0 2 0x14200 zerothread 71026 288846 0 0 3 0x14200 aiodoned aiodoned 51650 234197 0 0 3 0x14200 syncer update 75657 32553 0 0 3 0x14200 cleaner cleaner 14040 363877 0 0 3 0x14200 reaper reaper 75685 99980 0 0 3 0x14200 pgdaemon pagedaemon 70055 200313 0 0 3 0x14200 bored crynlk 68528 306037 0 0 3 0x14200 bored crypto 49306 523472 0 0 3 0x40014200 acpi0 acpi0 86941 280697 0 0 3 0x14200 bored softnet 20024 504136 0 0 3 0x14200 bored systqmp 34803 409024 0 0 3 0x14200 bored systq 68999 224000 0 0 3 0x40014200 bored softclock 65342 1200 0 0 3 0x40014200 idle0 38562 44221 0 0 3 0x14200 bored smr 1 479351 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 9481 6460K 6972K 78643K 10917 0 pcb 15 8K 8K 78643K 29 0 rtable 93 2K 3K 78643K 253 0 ifaddr 46 10K 10K 78643K 53 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 15 0 iov 0 0K 16K 78643K 26 0 mount 1 1K 1K 78643K 1 0 vnodes 1223 77K 77K 78643K 1315 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 10 0K 0K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 86 0 proc 48 38K 63K 78643K 362 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 0 0K 0K 78643K 12 0 in_multi 28 1K 2K 78643K 43 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 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 183 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 119 22K 22K 78643K 1043 0 UVM aobj 2 2K 2K 78643K 2 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 7 0K 0K 78643K 12 0 temp 86 3011K 3075K 78643K 3425 0 kqueue 0 0K 0K 78643K 2 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 2 1 0 1 1 0 8 0 rtpcb 80 96 0 94 1 0 1 1 0 8 0 rtentry 112 49 0 11 2 0 2 2 0 8 0 unpcb 120 43 0 35 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 28 0 28 1 1 0 1 0 8 0 tcpcb 544 35 0 30 1 0 1 1 0 8 0 inpcb 280 108 0 99 3 0 3 3 0 8 2 nd6 48 5 0 2 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 236 0 43 14 0 14 14 0 8 0 art_table 32 237 0 43 2 0 2 2 0 8 0 art_node 16 48 0 13 1 0 1 1 0 8 0 sysvmsgpl 40 10 0 6 1 0 1 1 0 8 0 semapl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1498 0 99 46 0 46 46 0 8 0 ffsino 240 1498 0 99 83 0 83 83 0 8 0 nchpl 144 1826 0 213 60 0 60 60 0 8 0 uvmvnodes 72 1621 0 0 30 0 30 30 0 8 0 vnodes 208 1621 0 0 86 0 86 86 0 8 0 namei 1024 4596 0 4596 1 0 1 1 0 8 1 scxspl 192 4789 0 4789 1 0 1 1 0 8 1 plimitpl 152 20 0 13 1 0 1 1 0 8 0 sigapl 432 257 0 244 2 0 2 2 0 8 0 futexpl 56 2027 0 2027 1 0 1 1 0 8 1 knotepl 112 71 0 52 1 0 1 1 0 8 0 kqueuepl 104 24 0 22 1 0 1 1 0 8 0 pipepl 112 162 0 143 1 0 1 1 0 8 0 fdescpl 424 258 0 244 2 0 2 2 0 8 0 filepl 120 1631 0 1534 5 0 5 5 0 8 2 lockfpl 104 21 0 20 1 0 1 1 0 8 0 lockfspl 48 8 0 7 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 96 186 0 179 1 0 1 1 0 8 0 zombiepl 144 244 0 244 1 0 1 1 0 8 1 processpl 872 273 0 244 4 0 4 4 0 8 0 procpl 632 351 0 314 4 0 4 4 0 8 0 sosppl 128 1 0 1 1 0 1 1 0 8 1 sockpl 384 253 0 234 5 0 5 5 0 8 3 mcl64k 65536 8 0 8 1 0 1 1 0 8 1 mcl12k 12288 2 0 2 1 0 1 1 0 8 1 mcl9k 9216 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 3 0 3 1 0 1 1 0 8 1 mcl4k 4096 24 0 24 2 1 1 1 0 8 1 mcl2k 2048 69600 0 69557 14 2 12 13 0 8 5 mtagpl 80 52 0 2 3 1 2 2 0 8 0 mbufpl 256 110503 0 110287 19 1 18 18 0 8 1 bufpl 280 6292 0 1326 355 0 355 355 0 8 0 anonpl 16 42629 0 23815 77 1 76 76 0 107 0 amapchunkpl 152 1167 0 1015 8 0 8 8 0 158 1 amappl16 192 1319 0 286 52 0 52 52 0 8 0 amappl15 184 58 0 53 1 0 1 1 0 8 0 amappl14 176 51 0 45 1 0 1 1 0 8 0 amappl13 168 2 0 1 1 0 1 1 0 8 0 amappl12 160 3 0 2 2 1 1 1 0 8 0 amappl11 152 51 0 40 1 0 1 1 0 8 0 amappl10 144 43 0 38 1 0 1 1 0 8 0 amappl9 136 544 0 539 1 0 1 1 0 8 0 amappl8 128 123 0 95 1 0 1 1 0 8 0 amappl7 120 121 0 109 1 0 1 1 0 8 0 amappl6 112 56 0 50 1 0 1 1 0 8 0 amappl5 104 177 0 164 1 0 1 1 0 8 0 amappl4 96 465 0 438 1 0 1 1 0 8 0 amappl3 88 117 0 110 1 0 1 1 0 8 0 amappl2 80 1273 0 1207 3 1 2 3 0 8 0 amappl1 72 14329 0 13906 24 13 11 20 0 8 1 amappl 80 568 0 524 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 258 0 244 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 258 0 244 1 0 1 1 0 8 0 vmmpekpl 168 5859 0 5837 2 0 2 2 0 8 0 vmmpepl 168 39103 0 36965 124 3 121 121 0 357 28 vmsppl 272 257 0 244 2 0 2 2 0 8 1 pdppl 4096 522 0 488 6 0 6 6 0 8 1 pvpl 32 138624 0 116818 178 0 178 178 0 265 1 pmappl 200 257 0 244 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 150 0 6 5 0 5 5 0 8 0