panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *274397 9418 0 0 0x4000000 0 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224af35) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8057ffcc00,6f8,8,fffffd8057ffce20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8057ffcc00,6f8,8,fffffd8057ffce20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8057ffcc00,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e56a348,fffffd8057ffcc00,ffff80001e44b620) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e44b878,ffff80001e44b884,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e44b878,ffff80001e44b884,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e44b878,ffff80001e44b884,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8057ffcc00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8057ffcc00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8057ffc900,ffff800000a07c80,fffffd805e56a2a0,0,0,fffffd805e56a230) at ip6_output+0xd02 rip6_output(fffffd8057ffc900,fffffd805e56b190,ffff80001e44bbe0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805e56b190,9,fffffd8057ffc900,0,0,ffff80001d3a7760) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805e56b190,0,ffff80001e44be28,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001e44be10, 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(ffffffff8224af35) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8057ffcc00,6f8,8,fffffd8057ffce20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8057ffcc00,6f8,8,fffffd8057ffce20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8057ffcc00,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e56a348,fffffd8057ffcc00,ffff80001e44b620) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e44b878,ffff80001e44b884,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e44b878,ffff80001e44b884,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e44b878,ffff80001e44b884,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8057ffcc00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8057ffcc00,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8057ffc900,ffff800000a07c80,fffffd805e56a2a0,0,0,fffffd805e56a230) at ip6_output+0xd02 rip6_output(fffffd8057ffc900,fffffd805e56b190,ffff80001e44bbe0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805e56b190,9,fffffd8057ffc900,0,0,ffff80001d3a7760) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805e56b190,0,ffff80001e44be28,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d3a7760,4,ffff80001e44be28,0,ffff80001e44bf10) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d3a7760,ffff80001e44bec8,ffff80001e44bf10) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e44bf90) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xfb9e4bc4150, count: -18 ddb> show registers rdi 0xffffffff81d9e1b7 db_enter+0x17 rsi 0x2cf5 __ALIGN_SIZE+0x1cf5 rbp 0xffff80001e44b390 rbx 0xffff80001e44b440 rdx 0x2cf6 __ALIGN_SIZE+0x1cf6 rcx 0xffff80001d433000 rax 0xffff80001d433000 r8 0xffff80001e44b350 r9 0x1 r10 0xffff8000009f8240 r11 0x142cebf7db052d51 r12 0x3000000008 r13 0xffff80001e44b3a0 r14 0x100 r15 0x1 rip 0xffffffff81d9e1b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e44b380 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.1) pid=274397 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff80001d3a8d50,0xffffffff825ac7c0 process=0xffff8000ffffb938 user=0xffff80001e447000, vmspace=0xfffffd806bc0aaa0 estcpu=19, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 9418 376877 41267 0 2 0 syz-executor.1 * 9418 274397 41267 0 7 0x4000000 syz-executor.1 79131 92520 76447 0 2 0 syz-executor.0 79131 407377 76447 0 3 0x4000080 fsleep syz-executor.0 76447 482212 5137 0 3 0x82 nanosleep syz-executor.0 41267 150064 5137 0 3 0x82 nanosleep syz-executor.1 5137 134160 96840 0 3 0x82 thrsleep syz-fuzzer 5137 226957 96840 0 3 0x4000082 thrsleep syz-fuzzer 5137 101701 96840 0 3 0x4000082 thrsleep syz-fuzzer 5137 390550 96840 0 3 0x4000082 thrsleep syz-fuzzer 5137 26779 96840 0 3 0x4000082 thrsleep syz-fuzzer 5137 145517 96840 0 3 0x4000082 kqread syz-fuzzer 5137 138744 96840 0 3 0x4000082 thrsleep syz-fuzzer 5137 424883 96840 0 3 0x4000082 thrsleep syz-fuzzer 96840 290047 87226 0 3 0x10008a pause ksh 87226 271895 3684 0 3 0x92 select sshd 28488 440341 1 0 3 0x100083 ttyin getty 3684 167638 1 0 3 0x80 select sshd 21633 428583 45284 73 3 0x100090 kqread syslogd 45284 129728 1 0 3 0x100082 netio syslogd 86471 425830 1 77 3 0x100090 poll dhclient 80007 172171 1 0 3 0x80 poll dhclient 81686 35133 0 0 3 0x14200 bored smr 27554 247342 0 0 2 0x14200 zerothread 67065 328963 0 0 3 0x14200 aiodoned aiodoned 86944 128939 0 0 3 0x14200 syncer update 26949 254862 0 0 3 0x14200 cleaner cleaner 75188 299289 0 0 3 0x14200 reaper reaper 68911 402506 0 0 3 0x14200 pgdaemon pagedaemon 86977 76908 0 0 3 0x14200 bored crynlk 53755 378296 0 0 3 0x14200 bored crypto 49467 350116 0 0 3 0x40014200 acpi0 acpi0 13313 80312 0 0 3 0x14200 bored softnet 15815 516145 0 0 3 0x14200 bored systqmp 22110 55279 0 0 3 0x14200 bored systq 28234 75285 0 0 3 0x40014200 bored softclock 24459 48839 0 0 3 0x40014200 idle0 1 412097 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 9479 6586K 6586K 78643K 10587 0 pcb 16 8K 8K 78643K 22 0 rtable 105 3K 3K 78643K 201 0 ifaddr 46 11K 11K 78643K 46 0 counters 21 16K 16K 78643K 21 0 ioctlops 0 0K 2K 78643K 19 0 iov 0 0K 2K 78643K 6 0 mount 1 1K 1K 78643K 1 0 vnodes 1218 77K 77K 78643K 1228 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 358 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 42 2K 2K 78643K 42 0 ether_multi 2 0K 0K 78643K 2 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 43 201K 201K 78643K 43 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 95 21K 23K 78643K 920 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 6 0K 0K 78643K 10 0 temp 66 3027K 3091K 78643K 1836 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 19 0 17 1 0 1 1 0 8 0 rtentry 112 49 0 5 2 0 2 2 0 8 0 unpcb 120 31 0 23 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 79 0 79 1 0 1 1 0 8 1 tcpcb 544 11 0 6 1 0 1 1 0 8 0 inpcb 280 40 0 30 1 0 1 1 0 8 0 rttmr 72 4 0 4 1 0 1 1 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 0 12 0 12 12 0 8 0 art_table 32 189 0 0 2 0 2 2 0 8 0 art_node 16 48 0 8 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 1432 0 33 46 0 46 46 0 8 0 ffsino 240 1432 0 33 83 0 83 83 0 8 0 nchpl 144 1678 0 69 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 4015 0 4015 1 0 1 1 0 8 1 vmpool 528 2 0 2 1 0 1 1 0 8 1 scxspl 192 4746 0 4746 1 0 1 1 0 8 1 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 232 0 203 4 0 4 4 0 8 0 futexpl 56 258 0 257 1 0 1 1 0 8 0 knotepl 112 53 0 34 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 16 77 0 67 1 0 1 1 0 8 0 pipepl 120 154 0 135 1 0 1 1 0 8 0 fdescpl 432 218 0 203 2 0 2 2 0 8 0 filepl 120 1074 0 973 4 0 4 4 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 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 58 0 51 1 0 1 1 0 8 0 zombiepl 144 203 0 203 1 0 1 1 0 8 1 processpl 920 232 0 203 4 0 4 4 0 8 0 procpl 624 253 0 215 4 0 4 4 0 8 1 sockpl 400 90 0 70 3 0 3 3 0 8 1 mcl64k 65536 5 0 5 1 0 1 1 0 8 1 mcl12k 12288 1 0 1 1 0 1 1 0 8 1 mcl8k 8192 1 0 1 1 0 1 1 0 8 1 mcl4k 4096 9 0 8 2 1 1 1 0 8 0 mcl2k 2048 61377 0 61332 15 2 13 13 0 8 6 mtagpl 80 6 0 2 2 1 1 1 0 8 0 mbufpl 256 97481 0 97381 12 1 11 11 0 8 1 bufpl 280 3977 0 160 273 0 273 273 0 8 0 anonpl 16 33744 0 21097 53 2 51 51 0 107 0 amapchunkpl 152 958 0 829 8 0 8 8 0 158 2 amappl16 192 843 0 160 35 0 35 35 0 8 0 amappl15 184 12 0 7 1 0 1 1 0 8 0 amappl14 176 4 0 2 2 1 1 1 0 8 0 amappl13 168 30 0 27 1 0 1 1 0 8 0 amappl12 160 4 0 3 1 0 1 1 0 8 0 amappl11 152 62 0 50 1 0 1 1 0 8 0 amappl10 144 12 0 9 1 0 1 1 0 8 0 amappl9 136 373 0 370 1 0 1 1 0 8 0 amappl8 128 259 0 247 1 0 1 1 0 8 0 amappl7 120 105 0 94 1 0 1 1 0 8 0 amappl6 112 18 0 16 2 1 1 1 0 8 0 amappl5 104 157 0 146 1 0 1 1 0 8 0 amappl4 96 444 0 413 2 0 2 2 0 8 1 amappl3 88 119 0 109 1 0 1 1 0 8 0 amappl2 80 921 0 847 3 0 3 3 0 8 1 amappl1 72 13545 0 13118 27 11 16 20 0 8 7 amappl 80 474 0 432 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 24 220 0 205 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 220 0 205 1 0 1 1 0 8 0 vmmpekpl 168 5660 0 5634 2 0 2 2 0 8 0 vmmpepl 168 33253 0 31420 103 7 96 96 0 357 16 vmsppl 272 219 0 205 2 0 2 2 0 8 1 pdppl 4096 446 0 410 6 0 6 6 0 8 1 pvpl 32 119933 0 103905 130 0 130 130 0 265 0 pmappl 200 219 0 205 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 149 0 6 5 0 5 5 0 8 0