panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND * 97908 73477 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8222435d) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806bc22000,80,8,fffffd806bc22420) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806bc22000,80,8,fffffd806bc22420) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806bc22000,80,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4d4af0,fffffd806bc22000,ffff80001e479290) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e4794e8,ffff80001e4794f4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e4794e8,ffff80001e4794f4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e4794e8,ffff80001e4794f4,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd806bc22000) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd806bc22000,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd806bc22200,ffff800000a00500,fffffd805e4d4930,0,0,fffffd805e4d48c0) at ip6_output+0xd02 rip6_output(fffffd806bc22100,fffffd8054d09610,ffff80001e479850,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8054d09610,9,fffffd806bc22100,0,0,ffff80001e43e290) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8054d09610,0,ffff80001e479a98,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 end trace frame: 0xffff80001e479a80, 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(ffffffff8222435d) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806bc22000,80,8,fffffd806bc22420) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806bc22000,80,8,fffffd806bc22420) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806bc22000,80,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4d4af0,fffffd806bc22000,ffff80001e479290) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e4794e8,ffff80001e4794f4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e4794e8,ffff80001e4794f4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e4794e8,ffff80001e4794f4,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd806bc22000) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd806bc22000,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd806bc22200,ffff800000a00500,fffffd805e4d4930,0,0,fffffd805e4d48c0) at ip6_output+0xd02 rip6_output(fffffd806bc22100,fffffd8054d09610,ffff80001e479850,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8054d09610,9,fffffd806bc22100,0,0,ffff80001e43e290) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8054d09610,0,ffff80001e479a98,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff80001e43e290,5,ffff80001e479a98,0,ffff80001e479b80) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff80001e43e290,ffff80001e479b38,ffff80001e479b80) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001e479c00) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x52651727b70, count: -18 ddb> show registers rdi 0xffffffff812a12c7 db_enter+0x17 rsi 0x15cf __ALIGN_SIZE+0x5cf rbp 0xffff80001e479000 rbx 0xffff80001e4790b0 rdx 0x15d0 __ALIGN_SIZE+0x5d0 rcx 0xffff80001d43d000 rax 0xffff80001d43d000 r8 0xffff80001e478fc0 r9 0x1 r10 0xffff8000009ecd00 r11 0xc40423bf6885d6f7 r12 0x3000000008 r13 0xffff80001e479010 r14 0x100 r15 0x1 rip 0xffffffff812a12c8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e478ff0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=97908 stat=onproc flags process=0 proc=4000000 pri=78, usrpri=78, nice=20 forw=0xffffffffffffffff, list=0xffff80001e43f8c8,0xffffffff82576698 process=0xffff8000ffff6db0 user=0xffff80001e474000, vmspace=0xfffffd8055a73ab0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 73477 25827 44417 0 2 0 syz-executor.0 *73477 97908 44417 0 7 0x4000000 syz-executor.0 88538 481980 96861 0 2 0 syz-executor.1 88538 111907 96861 0 3 0x4000080 poll syz-executor.1 96861 358304 50628 0 3 0x82 nanosleep syz-executor.1 75736 219182 0 0 3 0x14200 bored sosplice 44417 392865 50628 0 3 0x82 nanosleep syz-executor.0 50628 53138 27310 0 3 0x82 thrsleep syz-fuzzer 50628 390976 27310 0 3 0x4000082 thrsleep syz-fuzzer 50628 499598 27310 0 3 0x4000082 thrsleep syz-fuzzer 50628 290594 27310 0 3 0x4000082 thrsleep syz-fuzzer 50628 292537 27310 0 3 0x4000082 thrsleep syz-fuzzer 50628 50853 27310 0 3 0x4000082 thrsleep syz-fuzzer 50628 73414 27310 0 3 0x4000082 thrsleep syz-fuzzer 50628 46354 27310 0 3 0x4000082 kqread syz-fuzzer 27310 357923 84136 0 3 0x10008a pause ksh 84136 354842 79628 0 3 0x92 select sshd 69891 491998 1 0 3 0x100083 ttyin getty 79628 211404 1 0 3 0x80 select sshd 95789 466827 3040 73 3 0x100090 kqread syslogd 3040 509623 1 0 3 0x100082 netio syslogd 95481 126811 1 77 3 0x100090 poll dhclient 30702 68884 1 0 3 0x80 poll dhclient 3201 221789 0 0 2 0x14200 zerothread 84049 12908 0 0 3 0x14200 aiodoned aiodoned 30049 313800 0 0 3 0x14200 syncer update 91791 305277 0 0 3 0x14200 cleaner cleaner 17278 225460 0 0 3 0x14200 reaper reaper 1803 2484 0 0 3 0x14200 pgdaemon pagedaemon 37627 136381 0 0 3 0x14200 bored crynlk 9538 152082 0 0 3 0x14200 bored crypto 31901 512241 0 0 3 0x40014200 acpi0 acpi0 59574 4056 0 0 3 0x14200 bored softnet 27314 134875 0 0 3 0x14200 bored systqmp 25158 240163 0 0 3 0x14200 bored systq 39846 246288 0 0 3 0x40014200 bored softclock 6576 135299 0 0 3 0x40014200 idle0 69536 505291 0 0 3 0x14200 bored smr 1 171835 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 9542 6500K 6811K 78643K 11956 0 pcb 15 8K 8K 78643K 102 0 rtable 99 11K 12K 78643K 383 0 ifaddr 85 16K 16K 78643K 141 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 32 0 iov 0 0K 16K 78643K 93 0 mount 1 1K 1K 78643K 1 0 vnodes 1211 76K 77K 78643K 1726 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 9 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 143 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 429 0 sigio 0 0K 0K 78643K 6 0 proc 48 38K 54K 78643K 440 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 41 0 in_multi 80 3K 3K 78643K 124 0 ether_multi 1 0K 0K 78643K 6 0 mrt 0 0K 0K 78643K 2 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 244 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 125 71K 71K 78643K 1948 0 UVM aobj 26 2K 2K 78643K 27 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 110 0 NDP 13 0K 0K 78643K 25 0 temp 137 3019K 3084K 78643K 10299 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 7 1 0 1 1 0 8 0 rtpcb 80 91 0 89 1 0 1 1 0 8 0 rtentry 112 65 0 30 2 0 2 2 0 8 0 unpcb 120 274 0 264 1 0 1 1 0 8 0 syncache 264 7 0 7 3 3 0 1 0 8 0 tcpqe 32 150 0 150 2 2 0 1 0 8 0 tcpcb 544 177 0 172 1 0 1 1 0 8 0 ipq 40 1 0 1 1 0 1 1 0 8 1 ipqe 40 45 0 45 1 0 1 1 0 8 1 inpcb 280 611 0 602 3 2 1 3 0 8 0 rttmr 72 1 0 1 1 0 1 1 0 8 1 nd6 48 7 0 5 1 0 1 1 0 8 0 ppxss 1128 5 0 5 2 2 0 1 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 275 0 97 14 0 14 14 0 8 1 art_table 32 277 0 97 2 0 2 2 0 8 0 art_node 16 64 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 61 0 42 1 0 1 1 0 8 0 semupl 112 2 0 2 1 1 0 1 0 8 0 semapl 112 141 0 131 1 0 1 1 0 8 0 shmpl 112 25 0 1 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2067 0 675 46 0 46 46 0 8 0 ffsino 240 2067 0 675 83 0 83 83 0 8 0 nchpl 144 2862 0 1266 60 0 60 60 0 8 0 uvmvnodes 72 2488 0 0 46 0 46 46 0 8 0 vnodes 208 2488 0 0 131 0 131 131 0 8 0 namei 1024 8280 0 8280 1 0 1 1 0 8 1 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 528 8 0 2 1 0 1 1 0 8 0 scxspl 192 8699 0 8699 1 0 1 1 0 8 1 plimitpl 152 47 0 40 1 0 1 1 0 8 0 sigapl 432 597 0 583 2 0 2 2 0 8 0 futexpl 56 12636 0 12636 1 0 1 1 0 8 1 knotepl 112 110 0 91 1 0 1 1 0 8 0 kqueuepl 104 126 0 124 1 0 1 1 0 8 0 pipepl 112 354 0 335 2 0 2 2 0 8 1 fdescpl 424 598 0 583 2 0 2 2 0 8 0 filepl 120 4461 0 4363 8 2 6 6 0 8 3 lockfpl 104 155 0 154 1 0 1 1 0 8 0 lockfspl 48 48 0 47 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 28 0 18 1 0 1 1 0 8 0 ucredpl 96 608 0 601 1 0 1 1 0 8 0 zombiepl 144 583 0 583 1 0 1 1 0 8 1 processpl 872 613 0 583 4 0 4 4 0 8 0 procpl 632 1134 0 1095 4 0 4 4 0 8 0 sosppl 128 9 0 9 2 1 1 1 0 8 1 sockpl 384 983 0 962 7 2 5 6 0 8 2 mcl64k 65536 273 0 273 29 27 2 29 0 8 2 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 11 0 11 1 0 1 1 0 8 1 mcl9k 9216 13 0 13 1 0 1 1 0 8 1 mcl8k 8192 18 0 18 1 0 1 1 0 8 1 mcl4k 4096 58 0 58 1 0 1 1 0 8 1 mcl2k2 2112 2 0 2 2 1 1 1 0 8 1 mcl2k 2048 69693 0 69651 15 8 7 13 0 8 1 mtagpl 80 26 0 26 3 2 1 1 0 8 1 mbufpl 256 113648 0 113574 42 21 21 36 0 8 8 bufpl 280 7300 0 1332 427 0 427 427 0 8 0 anonpl 16 105602 0 86042 97 9 88 95 0 107 8 amapchunkpl 152 3749 0 3589 15 4 11 11 0 158 4 amappl16 192 4353 0 3264 75 12 63 66 0 8 8 amappl15 184 60 0 55 1 0 1 1 0 8 0 amappl14 176 105 0 101 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 11 0 8 1 0 1 1 0 8 0 amappl11 152 53 0 42 1 0 1 1 0 8 0 amappl10 144 212 0 208 1 0 1 1 0 8 0 amappl9 136 560 0 556 1 0 1 1 0 8 0 amappl8 128 123 0 97 1 0 1 1 0 8 0 amappl7 120 296 0 281 1 0 1 1 0 8 0 amappl6 112 67 0 58 1 0 1 1 0 8 0 amappl5 104 174 0 164 1 0 1 1 0 8 0 amappl4 96 738 0 712 1 0 1 1 0 8 0 amappl3 88 289 0 278 1 0 1 1 0 8 0 amappl2 80 3952 0 3874 3 1 2 3 0 8 0 amappl1 72 20299 0 19865 23 14 9 20 0 8 0 amappl 80 1419 0 1371 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 26 0 1 1 0 1 1 0 8 0 uaddrrnd 24 606 0 585 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 606 0 585 1 0 1 1 0 8 0 vmmpekpl 168 7939 0 7916 2 0 2 2 0 8 0 vmmpepl 168 80695 0 78374 151 15 136 137 0 357 35 vmsppl 272 605 0 585 3 1 2 2 0 8 0 pdppl 4096 1218 0 1176 7 1 6 6 0 8 0 pvpl 32 262601 0 240218 220 10 210 220 0 265 26 pmappl 200 605 0 585 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 205 0 61 5 0 5 5 0 8 0