panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *114638 93058 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8224e28e) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8069473300,6f8,8,fffffd805a4b7b20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8069473300,6f8,8,fffffd805a4b7b20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8069473300,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e5637a8,fffffd8069473300,ffff80001e42bc90) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e42bee8,ffff80001e42bef4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e42bee8,ffff80001e42bef4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e42bee8,ffff80001e42bef4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8069473300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8069473300,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8069473f00,ffff800000a07b00,fffffd805e5633b8,0,0,fffffd805e563348) at ip6_output+0xd02 rip6_output(fffffd8069473f00,fffffd806b857020,ffff80001e42c250,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806b857020,9,fffffd8069473f00,0,0,ffff80001d3519d8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806b857020,0,ffff80001e42c498,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001e42c480, 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(ffffffff8224e28e) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8069473300,6f8,8,fffffd805a4b7b20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8069473300,6f8,8,fffffd805a4b7b20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8069473300,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd805e5637a8,fffffd8069473300,ffff80001e42bc90) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001e42bee8,ffff80001e42bef4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e42bee8,ffff80001e42bef4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e42bee8,ffff80001e42bef4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8069473300) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8069473300,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8069473f00,ffff800000a07b00,fffffd805e5633b8,0,0,fffffd805e563348) at ip6_output+0xd02 rip6_output(fffffd8069473f00,fffffd806b857020,ffff80001e42c250,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806b857020,9,fffffd8069473f00,0,0,ffff80001d3519d8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806b857020,0,ffff80001e42c498,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d3519d8,4,ffff80001e42c498,0,ffff80001e42c580) at dofilewritev+0x1ab sys/kern/sys_generic.c:365 sys_write(ffff80001d3519d8,ffff80001e42c538,ffff80001e42c580) at sys_write+0x83 sys/kern/sys_generic.c:285 syscall(ffff80001e42c600) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xe67e9346380, count: -18 ddb> show registers rdi 0xffffffff81371d47 db_enter+0x17 rsi 0x2b11 __ALIGN_SIZE+0x1b11 rbp 0xffff80001e42ba00 rbx 0xffff80001e42bab0 rdx 0x2b12 __ALIGN_SIZE+0x1b12 rcx 0xffff80001d427000 rax 0xffff80001d427000 r8 0xffff80001e42b9c0 r9 0x1 r10 0xffff8000009f84c0 r11 0x63a6e8c56227bdf7 r12 0x3000000008 r13 0xffff80001e42ba10 r14 0x100 r15 0x1 rip 0xffffffff81371d48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e42b9f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=114638 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=77, nice=20 forw=0xffffffffffffffff, list=0xffff80001d352d58,0xffffffff825b1558 process=0xffff8000ffff95a8 user=0xffff80001e427000, vmspace=0xfffffd806bc0add0 estcpu=27, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 93058 137981 24092 0 2 0 syz-executor.0 *93058 114638 24092 0 7 0x4000000 syz-executor.0 8390 481718 28059 0 3 0x80 nanosleep syz-executor.1 8390 143261 28059 0 3 0x4000080 pipewr syz-executor.1 8390 199574 28059 0 3 0x4000080 pipewr syz-executor.1 8390 128401 28059 0 3 0x4000080 fsleep syz-executor.1 11947 126819 0 0 3 0x14200 acct acct 6535 341667 1 0 3 0x100083 ttyin getty 28059 366499 64505 0 3 0x82 nanosleep syz-executor.1 24092 46643 64505 0 3 0x82 nanosleep syz-executor.0 64505 302295 89720 0 3 0x82 thrsleep syz-fuzzer 64505 477011 89720 0 3 0x4000082 thrsleep syz-fuzzer 64505 15015 89720 0 3 0x4000082 thrsleep syz-fuzzer 64505 272433 89720 0 3 0x4000082 thrsleep syz-fuzzer 64505 197312 89720 0 3 0x4000082 kqread syz-fuzzer 64505 134512 89720 0 3 0x4000082 thrsleep syz-fuzzer 64505 87599 89720 0 3 0x4000082 thrsleep syz-fuzzer 89720 271157 70319 0 3 0x10008a pause ksh 70319 56921 20483 0 3 0x92 select sshd 20483 30509 1 0 3 0x80 select sshd 52689 353020 57799 73 3 0x100090 kqread syslogd 57799 95462 1 0 3 0x100082 netio syslogd 85070 82679 1 77 3 0x100090 poll dhclient 27076 449588 1 0 3 0x80 poll dhclient 57262 259810 0 0 3 0x14200 bored smr 68214 379299 0 0 2 0x14200 zerothread 43849 214873 0 0 3 0x14200 aiodoned aiodoned 52011 58354 0 0 3 0x14200 syncer update 81724 205144 0 0 3 0x14200 cleaner cleaner 52916 376042 0 0 3 0x14200 reaper reaper 25493 254065 0 0 3 0x14200 pgdaemon pagedaemon 32726 490530 0 0 3 0x14200 bored crynlk 3685 237391 0 0 3 0x14200 bored crypto 92588 55319 0 0 3 0x40014200 acpi0 acpi0 61918 189326 0 0 3 0x14200 bored softnet 90085 442717 0 0 3 0x14200 bored systqmp 54772 69720 0 0 3 0x14200 bored systq 60253 277272 0 0 3 0x40014200 bored softclock 92971 479245 0 0 3 0x40014200 idle0 1 374409 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 9483 6470K 7112K 78643K 10939 0 pcb 16 8K 8K 78643K 44 0 rtable 108 3K 3K 78643K 236 0 ifaddr 54 12K 12K 78643K 66 0 counters 21 16K 16K 78643K 23 0 ioctlops 0 0K 2K 78643K 18 0 iov 0 0K 12K 78643K 10 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1321 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 10 0K 0K 78643K 10 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 6 17K 25K 78643K 127 0 proc 49 38K 54K 78643K 394 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 14 0 in_multi 38 2K 2K 78643K 61 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 37 175K 175K 78643K 37 0 exec 0 0K 1K 78643K 192 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 97 21K 21K 78643K 1195 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 24 0 NDP 8 0K 0K 78643K 15 0 temp 73 3027K 3091K 78643K 9947 0 kqueue 3 4K 8K 78643K 5 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 7 0 0 1 0 1 1 0 8 0 rtpcb 80 27 0 25 1 0 1 1 0 8 0 rtentry 112 52 0 8 2 0 2 2 0 8 0 unpcb 120 143 0 135 1 0 1 1 0 8 0 syncache 264 8 0 8 2 1 1 1 0 8 1 tcpqe 32 92 0 92 2 1 1 1 0 8 1 tcpcb 544 73 0 67 1 0 1 1 0 8 0 inpcb 280 152 0 141 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 256 221 0 40 13 0 13 13 0 8 0 art_table 32 222 0 40 2 0 2 2 0 8 0 art_node 16 51 0 10 1 0 1 1 0 8 0 semapl 112 8 0 0 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 1557 0 156 46 0 46 46 0 8 0 ffsino 240 1557 0 156 83 0 83 83 0 8 0 nchpl 144 1917 0 306 60 0 60 60 0 8 0 uvmvnodes 72 1684 0 0 31 0 31 31 0 8 0 vnodes 208 1684 0 0 89 0 89 89 0 8 0 namei 1024 4814 0 4814 1 0 1 1 0 8 1 vmpool 528 2 0 2 1 0 1 1 0 8 1 scxspl 192 5869 0 5867 1 0 1 1 0 8 0 plimitpl 152 24 0 17 1 0 1 1 0 8 0 sigapl 424 315 0 285 4 0 4 4 0 8 0 futexpl 56 1985 0 1984 1 0 1 1 0 8 0 knotepl 112 55 0 36 1 0 1 1 0 8 0 kqueuepl 144 14 0 12 1 0 1 1 0 8 0 pipelkpl 16 153 0 142 1 0 1 1 0 8 0 pipepl 120 306 0 285 1 0 1 1 0 8 0 fdescpl 432 300 0 285 2 0 2 2 0 8 0 filepl 120 1826 0 1725 4 0 4 4 0 8 0 lockfpl 104 55 0 54 1 0 1 1 0 8 0 lockfspl 48 20 0 19 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 96 139 0 132 1 0 1 1 0 8 0 zombiepl 144 285 0 285 1 0 1 1 0 8 1 processpl 920 315 0 285 4 0 4 4 0 8 0 procpl 624 527 0 487 4 0 4 4 0 8 0 sockpl 400 322 0 301 5 2 3 5 0 8 0 mcl64k 65536 16 0 16 1 0 1 1 0 8 1 mcl16k 16384 2 0 2 1 1 0 1 0 8 0 mcl12k 12288 2 0 2 2 1 1 1 0 8 1 mcl9k 9216 2 0 2 1 0 1 1 0 8 1 mcl8k 8192 1 0 1 1 0 1 1 0 8 1 mcl4k 4096 15 0 14 2 1 1 1 0 8 0 mcl2k 2048 61555 0 61507 16 9 7 13 0 8 0 mtagpl 80 13 0 2 2 1 1 1 0 8 0 mbufpl 256 97983 0 97856 17 4 13 13 0 8 1 bufpl 280 4291 0 161 295 0 295 295 0 8 0 anonpl 16 44860 0 31272 74 2 72 72 0 107 16 amapchunkpl 152 1484 0 1349 8 2 6 8 0 158 0 amappl16 192 1506 0 760 51 5 46 51 0 8 8 amappl15 184 55 0 51 1 0 1 1 0 8 0 amappl14 176 3 0 1 2 1 1 1 0 8 0 amappl13 168 31 0 29 1 0 1 1 0 8 0 amappl12 160 11 0 11 2 2 0 1 0 8 0 amappl11 152 59 0 47 1 0 1 1 0 8 0 amappl10 144 57 0 51 1 0 1 1 0 8 0 amappl9 136 373 0 369 1 0 1 1 0 8 0 amappl8 128 271 0 255 1 0 1 1 0 8 0 amappl7 120 147 0 136 1 0 1 1 0 8 0 amappl6 112 22 0 18 1 0 1 1 0 8 0 amappl5 104 247 0 235 1 0 1 1 0 8 0 amappl4 96 441 0 412 1 0 1 1 0 8 0 amappl3 88 115 0 108 1 0 1 1 0 8 0 amappl2 80 1633 0 1558 3 1 2 3 0 8 0 amappl1 72 15255 0 14820 26 17 9 20 0 8 0 amappl 80 742 0 698 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 24 302 0 287 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 302 0 287 1 0 1 1 0 8 0 vmmpekpl 168 6575 0 6549 2 0 2 2 0 8 0 vmmpepl 168 43598 0 41678 112 12 100 101 0 357 16 vmsppl 272 301 0 287 3 1 2 2 0 8 1 pdppl 4096 610 0 574 6 1 5 6 0 8 0 pvpl 32 147286 0 130622 177 0 177 177 0 265 41 pmappl 200 301 0 287 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 160 0 21 5 0 5 5 0 8 0