login: panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *456572 46246 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224e570) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806292df00,30,8,fffffd806292db20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806292df00,30,8,fffffd806292db20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806292df00,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8061a4c9d8,fffffd806292df00,ffff80001e83c050) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e83c2a8,ffff80001e83c2b4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e83c2a8,ffff80001e83c2b4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e83c2a8,ffff80001e83c2b4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd806292df00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd806292df00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd806292d600,ffff800000a0af80,fffffd8061a4c5e8,0,0,fffffd8061a4c578) at ip6_output+0xd02 rip6_output(fffffd806292d600,fffffd805cb5d1a0,ffff80001e83c610,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805cb5d1a0,9,fffffd806292d600,0,0,ffff80001d739758) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805cb5d1a0,0,ffff80001e83c858,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001e83c840, 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(ffffffff8224e570) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806292df00,30,8,fffffd806292db20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806292df00,30,8,fffffd806292db20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806292df00,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8061a4c9d8,fffffd806292df00,ffff80001e83c050) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e83c2a8,ffff80001e83c2b4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e83c2a8,ffff80001e83c2b4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e83c2a8,ffff80001e83c2b4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd806292df00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd806292df00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd806292d600,ffff800000a0af80,fffffd8061a4c5e8,0,0,fffffd8061a4c578) at ip6_output+0xd02 rip6_output(fffffd806292d600,fffffd805cb5d1a0,ffff80001e83c610,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805cb5d1a0,9,fffffd806292d600,0,0,ffff80001d739758) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805cb5d1a0,0,ffff80001e83c858,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d739758,5,ffff80001e83c858,0,ffff80001e83c940) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d739758,ffff80001e83c8f8,ffff80001e83c940) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e83c9c0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xa7ed9168800, count: -18 ddb> show registers rdi 0xffffffff81c53f27 db_enter+0x17 rsi 0x1102 __ALIGN_SIZE+0x102 rbp 0xffff80001e83bdc0 rbx 0xffff80001e83be70 rdx 0x1103 __ALIGN_SIZE+0x103 rcx 0xffff80001d831000 rax 0xffff80001d831000 r8 0xffff80001e83bd80 r9 0x1 r10 0xffff8000009f9140 r11 0x7b07d6fd0e2c190 r12 0x3000000008 r13 0xffff80001e83bdd0 r14 0x100 r15 0x1 rip 0xffffffff81c53f28 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e83bdb0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=456572 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=66, nice=20 forw=0xffffffffffffffff, list=0xffff80001d7a8600,0xffffffff82589b48 process=0xffff8000ffff9210 user=0xffff80001e837000, vmspace=0xfffffd806bc0add0 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 46246 448676 99057 0 2 0 syz-executor.1 *46246 456572 99057 0 7 0x4000000 syz-executor.1 1801 187320 0 0 3 0x14200 bored sosplice 34806 330729 36202 0 3 0x82 nanosleep syz-executor.0 99057 133725 36202 0 3 0x82 nanosleep syz-executor.1 36202 24447 41608 0 3 0x82 thrsleep syz-fuzzer 36202 512972 41608 0 3 0x4000082 thrsleep syz-fuzzer 36202 80606 41608 0 3 0x4000082 thrsleep syz-fuzzer 36202 503641 41608 0 3 0x4000082 thrsleep syz-fuzzer 36202 98197 41608 0 3 0x4000082 thrsleep syz-fuzzer 36202 236887 41608 0 3 0x4000082 thrsleep syz-fuzzer 36202 204009 41608 0 3 0x4000082 thrsleep syz-fuzzer 36202 422633 41608 0 3 0x4000082 kqread syz-fuzzer 41608 380222 16824 0 3 0x10008a pause ksh 16824 354413 74841 0 3 0x92 select sshd 92964 12085 1 0 3 0x100083 ttyin getty 74841 317453 1 0 3 0x80 select sshd 52626 53531 36036 73 3 0x100090 kqread syslogd 36036 172453 1 0 3 0x100082 netio syslogd 79130 82391 1 77 3 0x100090 poll dhclient 70285 335072 1 0 3 0x80 poll dhclient 88274 488994 0 0 3 0x14200 bored smr 38552 106852 0 0 2 0x14200 zerothread 37556 59378 0 0 3 0x14200 aiodoned aiodoned 71395 161926 0 0 3 0x14200 syncer update 23391 296681 0 0 3 0x14200 cleaner cleaner 18248 491399 0 0 3 0x14200 reaper reaper 91042 460277 0 0 3 0x14200 pgdaemon pagedaemon 4523 65508 0 0 3 0x14200 bored crynlk 50669 39028 0 0 3 0x14200 bored crypto 47202 381168 0 0 3 0x40014200 acpi0 acpi0 43887 349973 0 0 3 0x14200 bored softnet 50543 330675 0 0 3 0x14200 bored systqmp 12493 290185 0 0 3 0x14200 bored systq 54281 366381 0 0 3 0x40014200 bored softclock 92925 162638 0 0 3 0x40014200 idle0 1 344350 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 9452 6326K 6326K 78643K 10553 0 pcb 15 8K 8K 78643K 23 0 rtable 99 2K 3K 78643K 207 0 ifaddr 43 10K 10K 78643K 50 0 counters 22 16K 16K 78643K 23 0 ioctlops 0 0K 2K 78643K 15 0 iov 0 0K 4K 78643K 2 0 mount 1 1K 1K 78643K 1 0 vnodes 1217 77K 77K 78643K 1224 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 46 0 proc 47 38K 63K 78643K 363 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 1 0 in_multi 31 2K 2K 78643K 41 0 ether_multi 2 0K 0K 78643K 2 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 181 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 91 20K 21K 78643K 936 0 UVM aobj 4 2K 2K 78643K 4 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 2 0 NDP 7 0K 0K 78643K 12 0 temp 66 3031K 3095K 78643K 1842 0 kqueue 3 4K 4K 78643K 3 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 49 0 8 2 0 2 2 0 8 0 unpcb 120 27 0 19 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 23 0 23 1 0 1 1 0 8 1 tcpcb 544 39 0 31 1 0 1 1 0 8 0 inpcb 280 72 0 60 2 0 2 2 0 8 1 nd6 48 7 0 3 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 213 0 40 13 0 13 13 0 8 0 art_table 32 214 0 40 2 0 2 2 0 8 0 art_node 16 48 0 10 1 0 1 1 0 8 0 shmpl 112 2 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1438 0 38 46 0 46 46 0 8 0 ffsino 240 1438 0 38 83 0 83 83 0 8 0 nchpl 144 1683 0 71 60 0 60 60 0 8 0 uvmvnodes 72 1481 0 0 27 0 27 27 0 8 0 vnodes 208 1481 0 0 78 0 78 78 0 8 0 namei 1024 4021 0 4021 1 0 1 1 0 8 1 scxspl 192 5007 0 5007 1 0 1 1 0 8 1 plimitpl 152 14 0 7 1 0 1 1 0 8 0 sigapl 424 233 0 203 4 0 4 4 0 8 0 futexpl 56 381 0 381 1 0 1 1 0 8 1 knotepl 112 53 0 34 1 0 1 1 0 8 0 kqueuepl 144 4 0 2 1 0 1 1 0 8 0 pipelkpl 16 65 0 55 1 0 1 1 0 8 0 pipepl 120 130 0 111 1 0 1 1 0 8 0 fdescpl 432 218 0 203 2 0 2 2 0 8 0 filepl 120 1088 0 987 4 0 4 4 0 8 0 lockfpl 104 12 0 11 1 0 1 1 0 8 0 lockfspl 48 6 0 5 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 48 0 39 1 0 1 1 0 8 0 zombiepl 144 204 0 203 1 0 1 1 0 8 0 processpl 920 233 0 203 4 0 4 4 0 8 0 procpl 624 258 0 220 4 0 4 4 0 8 1 sosppl 128 3 0 3 1 0 1 1 0 8 1 sockpl 400 120 0 98 3 0 3 3 0 8 0 mcl64k 65536 1 0 1 1 0 1 1 0 8 1 mcl4k 4096 9 0 9 2 1 1 1 0 8 1 mcl2k 2048 62129 0 62086 16 3 13 13 0 8 7 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 98469 0 98389 12 2 10 10 0 8 0 bufpl 280 4212 0 164 290 0 290 290 0 8 0 anonpl 16 35884 0 22555 56 1 55 55 0 107 0 amapchunkpl 152 1130 0 994 8 0 8 8 0 158 2 amappl16 192 879 0 160 37 0 37 37 0 8 1 amappl15 184 12 0 7 1 0 1 1 0 8 0 amappl14 176 11 0 7 2 1 1 1 0 8 0 amappl13 168 23 0 22 1 0 1 1 0 8 0 amappl12 160 5 0 5 1 1 0 1 0 8 0 amappl11 152 63 0 50 1 0 1 1 0 8 0 amappl10 144 14 0 9 1 0 1 1 0 8 0 amappl9 136 384 0 380 1 0 1 1 0 8 0 amappl8 128 253 0 244 1 0 1 1 0 8 0 amappl7 120 105 0 95 1 0 1 1 0 8 0 amappl6 112 19 0 18 1 0 1 1 0 8 0 amappl5 104 162 0 148 1 0 1 1 0 8 0 amappl4 96 434 0 405 1 0 1 1 0 8 0 amappl3 88 113 0 105 1 0 1 1 0 8 0 amappl2 80 941 0 867 3 0 3 3 0 8 1 amappl1 72 13740 0 13318 26 9 17 20 0 8 8 amappl 80 497 0 454 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 218 0 203 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 218 0 203 1 0 1 1 0 8 0 vmmpekpl 168 5626 0 5597 2 0 2 2 0 8 0 vmmpepl 168 33094 0 31235 100 5 95 95 0 357 14 vmsppl 272 217 0 203 2 0 2 2 0 8 1 pdppl 4096 442 0 406 6 0 6 6 0 8 1 pvpl 32 124163 0 107814 136 0 136 136 0 265 4 pmappl 200 217 0 203 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 150 0 8 5 0 5 5 0 8 0