panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *130084 4436 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822284b1) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805812d300,6f8,8,fffffd805812d420) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805812d300,6f8,8,fffffd805812d420) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805812d300,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e55e230,fffffd805812d300,ffff80001f446050) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001f4462a8,ffff80001f4462b4,0,18) at rip6_input+0x4eb sys/netinet6/raw_ip6.c:206 ip_deliver(ffff80001f4462a8,ffff80001f4462b4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001f4462a8,ffff80001f4462b4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805812d100) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805812d100,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805812d500,ffff800000a03c80,fffffd805e55e4d0,0,0,fffffd805e55e460) at ip6_output+0xd02 rip6_output(fffffd805812d500,fffffd8066e6b330,ffff80001f446610,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8066e6b330,9,fffffd805812d500,0,0,ffff80001d3494e8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8066e6b330,0,ffff80001f446858,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001f446840, 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(ffffffff822284b1) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805812d300,6f8,8,fffffd805812d420) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805812d300,6f8,8,fffffd805812d420) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805812d300,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e55e230,fffffd805812d300,ffff80001f446050) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001f4462a8,ffff80001f4462b4,0,18) at rip6_input+0x4eb sys/netinet6/raw_ip6.c:206 ip_deliver(ffff80001f4462a8,ffff80001f4462b4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001f4462a8,ffff80001f4462b4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805812d100) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805812d100,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805812d500,ffff800000a03c80,fffffd805e55e4d0,0,0,fffffd805e55e460) at ip6_output+0xd02 rip6_output(fffffd805812d500,fffffd8066e6b330,ffff80001f446610,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8066e6b330,9,fffffd805812d500,0,0,ffff80001d3494e8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8066e6b330,0,ffff80001f446858,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d3494e8,4,ffff80001f446858,0,ffff80001f446940) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff80001d3494e8,ffff80001f4468f8,ffff80001f446940) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001f4469c0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xd7bb7f7f2b0, count: -18 ddb> show registers rdi 0xffffffff81ba0847 db_enter+0x17 rsi 0x2cd2 __ALIGN_SIZE+0x1cd2 rbp 0xffff80001f445dc0 rbx 0xffff80001f445e70 rdx 0x2cd3 __ALIGN_SIZE+0x1cd3 rcx 0xffff80001d441000 rax 0xffff80001d441000 r8 0xffff80001f445d80 r9 0x1 r10 0xffff800000a1d6c0 r11 0x1602501fa693f545 r12 0x3000000008 r13 0xffff80001f445dd0 r14 0x100 r15 0x1 rip 0xffffffff81ba0848 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001f445db0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=130084 stat=onproc flags process=0 proc=4000000 pri=50, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d349278,0xffffffff82576a00 process=0xffff8000ffffa710 user=0xffff80001f441000, vmspace=0xfffffd8052a159a0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 4436 510903 29106 0 2 0 syz-executor.1 * 4436 130084 29106 0 7 0x4000000 syz-executor.1 29106 413315 70682 0 3 0x82 nanosleep syz-executor.1 72912 151227 0 0 3 0x14200 bored sosplice 72671 461559 70682 0 3 0x82 nanosleep syz-executor.0 70682 58061 17805 0 3 0x82 kqread syz-fuzzer 70682 202367 17805 0 3 0x4000082 thrsleep syz-fuzzer 70682 201613 17805 0 3 0x4000082 thrsleep syz-fuzzer 70682 6375 17805 0 3 0x4000082 thrsleep syz-fuzzer 70682 387852 17805 0 3 0x4000082 thrsleep syz-fuzzer 70682 410477 17805 0 3 0x4000082 thrsleep syz-fuzzer 70682 121232 17805 0 3 0x4000082 thrsleep syz-fuzzer 17805 202590 21821 0 3 0x10008a pause ksh 21821 493646 79464 0 3 0x92 select sshd 48239 278899 1 0 3 0x100083 ttyin getty 79464 380835 1 0 3 0x80 select sshd 67369 215347 88601 73 3 0x100090 kqread syslogd 88601 377185 1 0 3 0x100082 netio syslogd 77090 15177 1 77 3 0x100090 poll dhclient 64563 419038 1 0 3 0x80 poll dhclient 52596 474313 0 0 2 0x14200 zerothread 16690 180530 0 0 3 0x14200 aiodoned aiodoned 84025 247118 0 0 3 0x14200 syncer update 62775 31649 0 0 3 0x14200 cleaner cleaner 2657 250559 0 0 3 0x14200 reaper reaper 16236 140063 0 0 3 0x14200 pgdaemon pagedaemon 44404 279855 0 0 3 0x14200 bored crynlk 34638 321959 0 0 3 0x14200 bored crypto 88008 328489 0 0 3 0x40014200 acpi0 acpi0 4585 20005 0 0 3 0x14200 bored softnet 75827 97478 0 0 3 0x14200 bored systqmp 57977 126551 0 0 3 0x14200 bored systq 4064 242821 0 0 3 0x40014200 bored softclock 89263 84431 0 0 3 0x40014200 idle0 65345 135747 0 0 3 0x14200 bored smr 1 458196 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 9499 6468K 6595K 78643K 10806 0 pcb 16 8K 8K 78643K 70 0 rtable 91 3K 3K 78643K 262 0 ifaddr 57 11K 11K 78643K 74 0 counters 21 16K 16K 78643K 23 0 ioctlops 0 0K 2K 78643K 22 0 iov 0 0K 12K 78643K 14 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1326 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 9 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 168 0 sigio 0 0K 0K 78643K 12 0 proc 49 38K 63K 78643K 415 0 subproc 32 2K 2K 78643K 57 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 1K 78643K 28 0 in_multi 24 1K 2K 78643K 58 0 ether_multi 2 0K 0K 78643K 7 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 208 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 100 21K 37K 78643K 1296 0 UVM aobj 14 2K 2K 78643K 14 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 22 0 NDP 12 0K 0K 78643K 18 0 temp 98 3008K 3072K 78643K 2445 0 kqueue 3 4K 10K 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 8 0 4 1 0 1 1 0 8 0 rtpcb 80 26 0 24 1 0 1 1 0 8 0 rtentry 112 55 0 21 2 0 2 2 0 8 0 unpcb 120 140 0 131 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 412 0 412 1 1 0 1 0 8 0 tcpcb 544 176 0 171 2 0 2 2 0 8 1 ipq 40 5 0 4 1 0 1 1 0 8 0 ipqe 40 97 0 96 1 0 1 1 0 8 0 inpcb 280 341 0 331 2 0 2 2 0 8 1 nd6 48 6 0 4 2 1 1 1 0 8 0 ppxss 1128 1 0 1 1 0 1 1 0 8 1 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 259 0 90 16 5 11 14 0 8 0 art_table 32 260 0 90 2 0 2 2 0 8 0 art_node 16 54 0 23 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 10 1 0 1 1 0 8 0 semapl 112 12 0 5 1 0 1 1 0 8 0 shmpl 112 12 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1584 0 185 46 0 46 46 0 8 0 ffsino 240 1584 0 185 83 0 83 83 0 8 0 nchpl 144 1988 0 389 60 0 60 60 0 8 0 uvmvnodes 72 1716 0 0 32 0 32 32 0 8 0 vnodes 208 1716 0 0 91 0 91 91 0 8 0 namei 1024 5152 0 5152 1 0 1 1 0 8 1 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 528 2 0 0 1 0 1 1 0 8 0 scxspl 192 5747 0 5747 1 0 1 1 0 8 1 plimitpl 152 29 0 22 1 0 1 1 0 8 0 sigapl 432 336 0 323 2 0 2 2 0 8 0 futexpl 56 3522 0 3522 1 0 1 1 0 8 1 knotepl 112 75 0 56 1 0 1 1 0 8 0 kqueuepl 104 112 0 110 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 432 337 0 323 2 0 2 2 0 8 0 filepl 120 2173 0 2075 5 1 4 5 0 8 0 lockfpl 104 30 0 29 1 0 1 1 0 8 0 lockfspl 48 12 0 11 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 18 0 8 1 0 1 1 0 8 0 ucredpl 96 165 0 158 1 0 1 1 0 8 0 zombiepl 144 323 0 322 1 0 1 1 0 8 0 processpl 896 352 0 322 4 0 4 4 0 8 0 procpl 624 549 0 512 4 0 4 4 0 8 1 sosppl 128 7 0 7 2 1 1 1 0 8 1 sockpl 400 508 0 487 4 1 3 4 0 8 0 mcl64k 65536 32 0 32 1 0 1 1 0 8 1 mcl16k 16384 1 0 1 1 1 0 1 0 8 0 mcl12k 12288 6 0 6 1 0 1 1 0 8 1 mcl9k 9216 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 7 0 7 1 0 1 1 0 8 1 mcl4k 4096 38 0 38 2 1 1 1 0 8 1 mcl2k2 2112 2 0 2 1 0 1 1 0 8 1 mcl2k 2048 62850 0 62793 18 10 8 16 0 8 0 mtagpl 80 12 0 6 2 1 1 1 0 8 0 mbufpl 256 101851 0 101737 27 18 9 25 0 8 0 bufpl 280 4228 0 179 290 0 290 290 0 8 0 anonpl 16 44317 0 32224 64 1 63 63 0 107 1 amapchunkpl 152 2266 0 2137 20 4 16 20 0 158 10 amappl16 192 1412 0 580 43 0 43 43 0 8 1 amappl15 184 61 0 57 1 0 1 1 0 8 0 amappl14 176 32 0 29 1 0 1 1 0 8 0 amappl13 168 63 0 62 1 0 1 1 0 8 0 amappl12 160 9 0 7 1 0 1 1 0 8 0 amappl11 152 52 0 41 1 0 1 1 0 8 0 amappl10 144 71 0 69 1 0 1 1 0 8 0 amappl9 136 581 0 576 1 0 1 1 0 8 0 amappl8 128 110 0 93 1 0 1 1 0 8 0 amappl7 120 155 0 144 1 0 1 1 0 8 0 amappl6 112 54 0 49 1 0 1 1 0 8 0 amappl5 104 172 0 162 1 0 1 1 0 8 0 amappl4 96 606 0 580 1 0 1 1 0 8 0 amappl3 88 128 0 116 1 0 1 1 0 8 0 amappl2 80 1809 0 1741 3 1 2 3 0 8 0 amappl1 72 16306 0 15883 25 16 9 20 0 8 0 amappl 80 788 0 745 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 13 0 0 1 0 1 1 0 8 0 uaddrrnd 24 339 0 323 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 339 0 323 1 0 1 1 0 8 0 vmmpekpl 168 6480 0 6449 2 0 2 2 0 8 0 vmmpepl 168 48667 0 46744 128 13 115 115 0 357 25 vmsppl 272 338 0 323 3 1 2 2 0 8 0 pdppl 4096 684 0 648 6 1 5 6 0 8 0 pvpl 32 152647 0 137567 153 1 152 153 0 265 2 pmappl 200 338 0 323 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 175 0 40 5 0 5 5 0 8 0