panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *508321 64729 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225550b) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805bd3a400,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8068b17578,fffffd805bd3a400,ffff80001e82db10) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e82dd68,ffff80001e82dd74,0,18) at rip6_input+0x4eb sys/netinet6/raw_ip6.c:206 ip_deliver(ffff80001e82dd68,ffff80001e82dd74,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e82dd68,ffff80001e82dd74,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805c7a6300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805c7a6300,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805c7a6200,ffff800000a0a400,fffffd8053cd2d98,0,0,fffffd8053cd2d28) at ip6_output+0xd02 rip6_output(fffffd805c7a6200,fffffd80563f6b00,ffff80001e82e0d0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80563f6b00,9,fffffd805c7a6200,0,0,ffff80001d751c48) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80563f6b00,0,ffff80001e82e318,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001e82e300, 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(ffffffff8225550b) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805bd3a400,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8068b17578,fffffd805bd3a400,ffff80001e82db10) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e82dd68,ffff80001e82dd74,0,18) at rip6_input+0x4eb sys/netinet6/raw_ip6.c:206 ip_deliver(ffff80001e82dd68,ffff80001e82dd74,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e82dd68,ffff80001e82dd74,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805c7a6300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805c7a6300,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805c7a6200,ffff800000a0a400,fffffd8053cd2d98,0,0,fffffd8053cd2d28) at ip6_output+0xd02 rip6_output(fffffd805c7a6200,fffffd80563f6b00,ffff80001e82e0d0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80563f6b00,9,fffffd805c7a6200,0,0,ffff80001d751c48) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80563f6b00,0,ffff80001e82e318,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d751c48,a,ffff80001e82e318,0,ffff80001e82e400) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d751c48,ffff80001e82e3b8,ffff80001e82e400) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e82e480) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x957a128ed10, count: -18 ddb> show registers rdi 0xffffffff819457b7 db_enter+0x17 rsi 0x1445 __ALIGN_SIZE+0x445 rbp 0xffff80001e82d880 rbx 0xffff80001e82d930 rdx 0x1446 __ALIGN_SIZE+0x446 rcx 0xffff80001d829000 rax 0xffff80001d829000 r8 0xffff80001e82d840 r9 0x1 r10 0xffff8000009f9200 r11 0xb887a7dbc13d934d r12 0x3000000008 r13 0xffff80001e82d890 r14 0x100 r15 0x1 rip 0xffffffff819457b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e82d870 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=508321 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001d752398,0xffffffff825c1630 process=0xffff8000ffffb5a0 user=0xffff80001e829000, vmspace=0xfffffd806bc09330 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 64729 480853 6692 0 2 0 syz-executor.0 *64729 508321 6692 0 7 0x4000000 syz-executor.0 56171 474183 1 0 3 0x82 nanosleep getty 82550 95214 0 0 3 0x14200 bored sosplice 98078 214090 1850 0 2 0x2 syz-executor.1 6692 182023 1850 0 3 0x82 nanosleep syz-executor.0 1850 88705 32684 0 3 0x82 thrsleep syz-fuzzer 1850 82231 32684 0 3 0x4000082 nanosleep syz-fuzzer 1850 315304 32684 0 3 0x4000082 thrsleep syz-fuzzer 1850 509702 32684 0 3 0x4000082 thrsleep syz-fuzzer 1850 226100 32684 0 3 0x4000082 thrsleep syz-fuzzer 1850 75062 32684 0 3 0x4000082 kqread syz-fuzzer 1850 351298 32684 0 3 0x4000082 thrsleep syz-fuzzer 32684 371805 25555 0 3 0x10008a pause ksh 25555 246396 83440 0 3 0x92 select sshd 83440 107738 1 0 3 0x80 select sshd 79221 363282 63633 73 3 0x100090 kqread syslogd 63633 32031 1 0 3 0x100082 netio syslogd 3124 521782 1 77 3 0x100090 poll dhclient 99204 430027 1 0 3 0x80 poll dhclient 92438 22934 0 0 3 0x14200 bored smr 91348 402004 0 0 2 0x14200 zerothread 15966 5852 0 0 3 0x14200 aiodoned aiodoned 67966 24684 0 0 3 0x14200 syncer update 65047 33065 0 0 3 0x14200 cleaner cleaner 19835 159363 0 0 3 0x14200 reaper reaper 85959 395513 0 0 3 0x14200 pgdaemon pagedaemon 26179 364547 0 0 3 0x14200 bored crynlk 11588 435096 0 0 3 0x14200 bored crypto 80978 501137 0 0 3 0x40014200 acpi0 acpi0 28059 46515 0 0 3 0x14200 bored softnet 43178 308655 0 0 3 0x14200 bored systqmp 78640 149154 0 0 3 0x14200 bored systq 34982 408154 0 0 3 0x40014200 bored softclock 42226 244210 0 0 3 0x40014200 idle0 1 400238 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 9471 6332K 6453K 78643K 10604 0 pcb 21 8K 8K 78643K 37 0 rtable 105 3K 3K 78643K 202 0 ifaddr 52 11K 11K 78643K 59 0 counters 21 16K 16K 78643K 22 0 ioctlops 0 0K 2K 78643K 25 0 iov 0 0K 12K 78643K 10 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 77K 78643K 1260 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 7 0K 1K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 81 0 proc 49 38K 54K 78643K 376 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 2 0K 0K 78643K 7 0 in_multi 36 2K 2K 78643K 41 0 ether_multi 2 0K 0K 78643K 4 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 31 148K 148K 78643K 31 0 exec 0 0K 1K 78643K 182 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 124 23K 23K 78643K 1054 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 4 0K 0K 78643K 12 0 NDP 8 0K 0K 78643K 13 0 temp 83 3034K 3098K 78643K 3968 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 45 0 1 2 0 2 2 0 8 0 unpcb 120 83 0 75 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 112 0 112 1 1 0 1 0 8 0 tcpcb 544 20 0 14 1 0 1 1 0 8 0 inpcb 280 72 0 57 2 0 2 2 0 8 0 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 44 0 4 1 0 1 1 0 8 0 sysvmsgpl 40 32 0 25 1 0 1 1 0 8 0 semapl 112 6 0 1 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 dino2pl 256 1530 0 133 88 0 88 88 0 8 0 ffsino 240 1530 0 133 83 0 83 83 0 8 0 nchpl 144 1817 0 215 60 0 60 60 0 8 0 uvmvnodes 72 1581 0 0 29 0 29 29 0 8 0 vnodes 208 1581 0 0 84 0 84 84 0 8 0 namei 1024 4504 0 4503 1 0 1 1 0 8 0 scxspl 192 4489 0 4489 1 0 1 1 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 269 0 240 4 0 4 4 0 8 0 futexpl 56 898 0 898 1 0 1 1 0 8 1 knotepl 112 61 0 42 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 16 71 0 61 1 0 1 1 0 8 0 pipepl 120 142 0 123 1 0 1 1 0 8 0 fdescpl 432 254 0 240 2 0 2 2 0 8 0 filepl 120 1305 0 1203 4 0 4 4 0 8 0 lockfpl 104 24 0 23 1 0 1 1 0 8 0 lockfspl 48 9 0 8 1 0 1 1 0 8 0 sessionpl 112 17 0 8 1 0 1 1 0 8 0 pgrppl 48 21 0 12 1 0 1 1 0 8 0 ucredpl 96 79 0 72 1 0 1 1 0 8 0 zombiepl 144 240 0 240 1 0 1 1 0 8 1 processpl 920 269 0 240 4 0 4 4 0 8 0 procpl 624 350 0 314 4 0 4 4 0 8 0 sosppl 128 1 0 1 1 0 1 1 0 8 1 sockpl 400 176 0 151 3 0 3 3 0 8 0 mcl64k 65536 3 0 3 1 0 1 1 0 8 1 mcl12k 12288 18 0 18 1 0 1 1 0 8 1 mcl9k 9216 2 0 2 1 0 1 1 0 8 1 mcl4k 4096 14 0 14 2 1 1 1 0 8 1 mcl2k2 2112 1 0 1 1 0 1 1 0 8 1 mcl2k 2048 56350 0 56291 17 4 13 15 0 8 5 mtagpl 80 4 0 2 2 1 1 1 0 8 0 mbufpl 256 90159 0 90057 13 3 10 10 0 8 2 bufpl 280 3305 0 128 227 0 227 227 0 8 0 anonpl 16 39371 0 24159 63 1 62 62 0 107 0 amapchunkpl 152 1177 0 1038 7 1 6 7 0 158 0 amappl16 192 1148 0 314 42 0 42 42 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 22 0 18 1 0 1 1 0 8 0 amappl13 168 23 0 22 1 0 1 1 0 8 0 amappl12 160 23 0 18 2 1 1 1 0 8 0 amappl11 152 63 0 53 1 0 1 1 0 8 0 amappl10 144 12 0 7 1 0 1 1 0 8 0 amappl9 136 365 0 363 1 0 1 1 0 8 0 amappl8 128 306 0 274 2 0 2 2 0 8 0 amappl7 120 117 0 103 1 0 1 1 0 8 0 amappl6 112 40 0 36 1 0 1 1 0 8 0 amappl5 104 212 0 201 1 0 1 1 0 8 0 amappl4 96 421 0 396 1 0 1 1 0 8 0 amappl3 88 122 0 114 1 0 1 1 0 8 0 amappl2 80 1196 0 1131 2 0 2 2 0 8 0 amappl1 72 14710 0 14311 24 12 12 17 0 8 3 amappl 80 583 0 539 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 3 0 0 1 0 1 1 0 8 0 uaddrrnd 24 254 0 240 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 254 0 240 1 0 1 1 0 8 0 vmmpekpl 168 5925 0 5901 2 0 2 2 0 8 0 vmmpepl 168 37725 0 35832 113 7 106 107 0 357 22 vmsppl 272 253 0 240 2 1 1 2 0 8 0 pdppl 4096 514 0 480 6 1 5 6 0 8 0 pvpl 32 135512 0 117332 149 0 149 149 0 265 2 pmappl 200 253 0 240 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 239 0 12 7 0 7 7 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225550b) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805bd3a400,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8068b17578,fffffd805bd3a400,ffff80001e82db10) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e82dd68,ffff80001e82dd74,0,18) at rip6_input+0x4eb sys/netinet6/raw_ip6.c:206 ip_deliver(ffff80001e82dd68,ffff80001e82dd74,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e82dd68,ffff80001e82dd74,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805c7a6300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805c7a6300,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805c7a6200,ffff800000a0a400,fffffd8053cd2d98,0,0,fffffd8053cd2d28) at ip6_output+0xd02 rip6_output(fffffd805c7a6200,fffffd80563f6b00,ffff80001e82e0d0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80563f6b00,9,fffffd805c7a6200,0,0,ffff80001d751c48) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80563f6b00,0,ffff80001e82e318,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d751c48,a,ffff80001e82e318,0,ffff80001e82e400) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d751c48,ffff80001e82e3b8,ffff80001e82e400) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e82e480) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x957a128ed10, count: -18 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8225550b) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd805bd3a400,30,8,fffffd805bd3af20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd805bd3a400,30,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8068b17578,fffffd805bd3a400,ffff80001e82db10) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e82dd68,ffff80001e82dd74,0,18) at rip6_input+0x4eb sys/netinet6/raw_ip6.c:206 ip_deliver(ffff80001e82dd68,ffff80001e82dd74,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e82dd68,ffff80001e82dd74,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd805c7a6300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd805c7a6300,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd805c7a6200,ffff800000a0a400,fffffd8053cd2d98,0,0,fffffd8053cd2d28) at ip6_output+0xd02 rip6_output(fffffd805c7a6200,fffffd80563f6b00,ffff80001e82e0d0,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd80563f6b00,9,fffffd805c7a6200,0,0,ffff80001d751c48) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd80563f6b00,0,ffff80001e82e318,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d751c48,a,ffff80001e82e318,0,ffff80001e82e400) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d751c48,ffff80001e82e3b8,ffff80001e82e400) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e82e480) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x957a128ed10, count: -18