login: panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *410318 93068 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82226d12) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806034c300,30,8,fffffd80562cbd20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806034c300,30,8,fffffd80562cbd20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806034c300,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4da578,fffffd806034c300,ffff80001e447910) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e447b68,ffff80001e447b74,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e447b68,ffff80001e447b74,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e447b68,ffff80001e447b74,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd806034c300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd806034c300,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd8056c32000,ffff8000009d7c00,fffffd805e4dad90,0,0,fffffd805e4dad20) at ip6_output+0xd02 rip6_output(fffffd8056c32000,fffffd8052555c28,ffff80001e447ed0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8052555c28,9,fffffd8056c32000,0,0,ffff80001d414ee8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8052555c28,0,ffff80001e448118,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 end trace frame: 0xffff80001e448100, 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(ffffffff82226d12) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806034c300,30,8,fffffd80562cbd20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806034c300,30,8,fffffd80562cbd20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806034c300,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4da578,fffffd806034c300,ffff80001e447910) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e447b68,ffff80001e447b74,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e447b68,ffff80001e447b74,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e447b68,ffff80001e447b74,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd806034c300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd806034c300,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd8056c32000,ffff8000009d7c00,fffffd805e4dad90,0,0,fffffd805e4dad20) at ip6_output+0xd02 rip6_output(fffffd8056c32000,fffffd8052555c28,ffff80001e447ed0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8052555c28,9,fffffd8056c32000,0,0,ffff80001d414ee8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8052555c28,0,ffff80001e448118,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff80001d414ee8,3,ffff80001e448118,0,ffff80001e448200) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff80001d414ee8,ffff80001e4481b8,ffff80001e448200) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001e448280) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x64a85adc980, count: -18 ddb> show registers rdi 0xffffffff815afb77 db_enter+0x17 rsi 0x1150 __ALIGN_SIZE+0x150 rbp 0xffff80001e447680 rbx 0xffff80001e447730 rdx 0x1151 __ALIGN_SIZE+0x151 rcx 0xffff80001f643000 rax 0xffff80001f643000 r8 0xffff80001e447640 r9 0x1 r10 0xffff8000009f24c0 r11 0x2d851252fecdd1f3 r12 0x3000000008 r13 0xffff80001e447690 r14 0x100 r15 0x1 rip 0xffffffff815afb78 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e447670 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=410318 stat=onproc flags process=0 proc=4000000 pri=74, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff80001d4153d8,0xffff80001d415b50 process=0xffff8000ffff7118 user=0xffff80001e443000, vmspace=0xfffffd8060334010 estcpu=24, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 65829 336896 46822 0 2 0 syz-executor.1 65829 343446 46822 0 3 0x4000080 fsleep syz-executor.1 93068 39580 20629 0 2 0 syz-executor.0 *93068 410318 20629 0 7 0x4000000 syz-executor.0 46822 74822 85564 0 3 0x82 nanosleep syz-executor.1 19508 478262 1 0 3 0x100083 ttyin getty 38763 459327 0 0 3 0x14200 bored sosplice 20629 146270 85564 0 3 0x82 nanosleep syz-executor.0 85564 65420 91521 0 3 0x82 thrsleep syz-fuzzer 85564 253538 91521 0 3 0x4000082 thrsleep syz-fuzzer 85564 489127 91521 0 3 0x4000082 thrsleep syz-fuzzer 85564 11096 91521 0 3 0x4000082 thrsleep syz-fuzzer 85564 99383 91521 0 3 0x4000082 kqread syz-fuzzer 85564 460308 91521 0 3 0x4000082 thrsleep syz-fuzzer 85564 375221 91521 0 3 0x4000082 thrsleep syz-fuzzer 85564 181365 91521 0 3 0x4000082 thrsleep syz-fuzzer 91521 291588 62681 0 3 0x10008a pause ksh 62681 7722 63952 0 3 0x92 select sshd 63952 197061 1 0 3 0x80 select sshd 81728 196581 11806 73 3 0x100090 kqread syslogd 11806 358285 1 0 3 0x100082 netio syslogd 65998 373468 1 77 3 0x100090 poll dhclient 30467 7393 1 0 3 0x80 poll dhclient 86178 344194 0 0 2 0x14200 zerothread 46397 227136 0 0 3 0x14200 aiodoned aiodoned 77727 192339 0 0 3 0x14200 syncer update 39718 92859 0 0 3 0x14200 cleaner cleaner 56254 30980 0 0 3 0x14200 reaper reaper 84742 279107 0 0 3 0x14200 pgdaemon pagedaemon 27424 389363 0 0 3 0x14200 bored crynlk 83453 440979 0 0 3 0x14200 bored crypto 75772 212617 0 0 3 0x40014200 acpi0 acpi0 42162 325435 0 0 3 0x14200 bored softnet 85671 320145 0 0 3 0x14200 bored systqmp 96725 296153 0 0 3 0x14200 bored systq 35709 212243 0 0 3 0x40014200 bored softclock 86319 187819 0 0 3 0x40014200 idle0 38673 391559 0 0 3 0x14200 bored smr 1 263962 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 9492 6350K 7129K 78643K 12170 0 pcb 18 8K 8K 78643K 130 0 rtable 113 4K 4K 78643K 436 0 ifaddr 57 13K 13K 78643K 165 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 24 0 iov 0 0K 24K 78643K 96 0 mount 1 1K 1K 78643K 1 0 vnodes 1214 76K 77K 78643K 1790 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 9K 78643K 28 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 156 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 948 0 sigio 0 0K 0K 78643K 25 0 proc 48 38K 63K 78643K 454 0 subproc 32 2K 2K 78643K 76 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 67 0 in_multi 49 2K 2K 78643K 97 0 ether_multi 1 0K 0K 78643K 5 0 mrt 0 0K 0K 78643K 8 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 157 705K 705K 78643K 157 0 exec 0 0K 1K 78643K 266 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 116 103K 120K 78643K 3010 0 UVM aobj 89 3K 3K 78643K 94 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 4 0K 0K 78643K 144 0 NDP 8 0K 0K 78643K 35 0 temp 116 3018K 3082K 78643K 9265 0 kqueue 0 0K 0K 78643K 24 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 12 0 5 1 0 1 1 0 8 0 rtpcb 80 53 0 51 1 0 1 1 0 8 0 rtentry 112 74 0 29 2 0 2 2 0 8 0 unpcb 120 315 0 303 2 1 1 2 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 750 0 750 1 1 0 1 0 8 0 tcpcb 544 301 0 295 1 0 1 1 0 8 0 inpcb 280 762 0 750 2 0 2 2 0 8 1 rttmr 72 4 0 4 1 1 0 1 0 8 0 nd6 48 9 0 5 1 0 1 1 0 8 0 ppxss 1128 12 0 12 1 1 0 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 315 0 89 15 0 15 15 0 8 0 art_table 32 316 0 89 2 0 2 2 0 8 0 art_node 16 73 0 32 1 0 1 1 0 8 0 sysvmsgpl 40 49 0 16 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 154 0 144 1 0 1 1 0 8 0 shmpl 112 92 0 5 3 0 3 3 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 2786 0 1390 46 0 46 46 0 8 0 ffsino 240 2786 0 1390 83 0 83 83 0 8 0 nchpl 144 4187 0 2590 60 0 60 60 0 8 0 uvmvnodes 72 3193 0 0 59 0 59 59 0 8 0 vnodes 208 3193 0 0 169 0 169 169 0 8 0 namei 1024 11138 0 11138 1 0 1 1 0 8 1 vcpupl 1984 7 0 0 1 0 1 1 0 8 0 vmpool 528 7 0 0 1 0 1 1 0 8 0 scxspl 192 12405 0 12403 1 0 1 1 0 8 0 plimitpl 152 75 0 68 1 0 1 1 0 8 0 sigapl 432 1114 0 1100 2 0 2 2 0 8 0 futexpl 56 11739 0 11738 1 0 1 1 0 8 0 knotepl 112 157 0 138 1 0 1 1 0 8 0 kqueuepl 104 112 0 110 1 0 1 1 0 8 0 pipepl 112 262 0 243 1 0 1 1 0 8 0 fdescpl 424 1115 0 1100 2 0 2 2 0 8 0 filepl 120 5258 0 5158 7 3 4 7 0 8 0 lockfpl 104 146 0 145 1 0 1 1 0 8 0 lockfspl 48 70 0 69 1 0 1 1 0 8 0 sessionpl 112 20 0 10 1 0 1 1 0 8 0 pgrppl 48 20 0 10 1 0 1 1 0 8 0 ucredpl 96 1126 0 1119 1 0 1 1 0 8 0 zombiepl 144 1100 0 1100 1 0 1 1 0 8 1 processpl 872 1130 0 1100 4 0 4 4 0 8 0 procpl 632 2156 0 2117 4 0 4 4 0 8 0 sosppl 128 29 0 29 2 2 0 1 0 8 0 sockpl 384 1131 0 1105 8 4 4 7 0 8 1 mcl64k 65536 33 0 33 3 2 1 1 0 8 1 mcl12k 12288 22 0 22 3 2 1 1 0 8 1 mcl9k 9216 30 0 30 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 1 0 1 0 8 0 mcl4k 4096 61 0 61 4 3 1 1 0 8 1 mcl2k 2048 54589 0 54535 22 13 9 17 0 8 1 mtagpl 80 37 0 17 2 1 1 1 0 8 0 mbufpl 256 98774 0 98578 18 4 14 14 0 8 1 bufpl 280 8080 0 1896 442 0 442 442 0 8 0 anonpl 16 146908 0 134096 83 7 76 81 0 107 16 amapchunkpl 152 6448 0 6319 19 4 15 15 0 158 8 amappl16 192 5235 0 4535 53 14 39 51 0 8 3 amappl15 184 1314 0 1306 1 0 1 1 0 8 0 amappl14 176 38 0 36 1 0 1 1 0 8 0 amappl12 160 151 0 149 1 0 1 1 0 8 0 amappl11 152 159 0 146 1 0 1 1 0 8 0 amappl10 144 26 0 23 1 0 1 1 0 8 0 amappl9 136 585 0 581 1 0 1 1 0 8 0 amappl8 128 122 0 101 1 0 1 1 0 8 0 amappl7 120 105 0 92 1 0 1 1 0 8 0 amappl6 112 161 0 154 1 0 1 1 0 8 0 amappl5 104 309 0 297 1 0 1 1 0 8 0 amappl4 96 1337 0 1307 1 0 1 1 0 8 0 amappl3 88 163 0 156 1 0 1 1 0 8 0 amappl2 80 8637 0 8558 3 1 2 3 0 8 0 amappl1 72 28088 0 27653 26 16 10 20 0 8 0 amappl 80 2441 0 2394 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 93 0 5 2 0 2 2 0 8 0 uaddrrnd 24 1122 0 1100 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1122 0 1100 1 0 1 1 0 8 0 vmmpekpl 168 9409 0 9383 2 0 2 2 0 8 0 vmmpepl 168 134701 0 132803 127 24 103 103 0 357 20 vmsppl 272 1121 0 1100 3 1 2 2 0 8 0 pdppl 4096 2250 0 2207 7 1 6 6 0 8 0 pvpl 32 404444 0 388556 205 15 190 195 0 265 50 pmappl 200 1121 0 1100 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 164 0 27 5 0 5 5 0 8 0