panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 327266 95932 0 0 0 0 syz-executor.1 * 37935 95932 0 0 0x4000000 1 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82246cc4) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806d45aa00,30,2,ffff800022d98488) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806d45aa00,30,2,ffff800022d98488) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806d45aa00,30,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1152 ip6_savecontrol(fffffd806f65c000,fffffd806d45aa00,ffff800022d985f0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800022d98838,ffff800022d98844,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800022d98838,ffff800022d98844,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800022d98838,ffff800022d98844,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806d45aa00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806d45aa00,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd807deb0200,ffff800000a21700,fffffd806f65ca48,0,0,fffffd806f65c9d8) at ip6_output+0xd26 rip6_output(fffffd807deb0200,fffffd806c869a90,ffff800022d98ba0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806c869a90,9,fffffd807deb0200,0,0,ffff800020ad7160) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806c869a90,0,ffff800022d98df8,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 end trace frame: 0xffff800022d98de0, 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{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic m_copydata: null mbuf ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff82246cc4) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806d45aa00,30,2,ffff800022d98488) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806d45aa00,30,2,ffff800022d98488) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806d45aa00,30,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1152 ip6_savecontrol(fffffd806f65c000,fffffd806d45aa00,ffff800022d985f0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800022d98838,ffff800022d98844,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800022d98838,ffff800022d98844,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800022d98838,ffff800022d98844,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806d45aa00) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806d45aa00,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd807deb0200,ffff800000a21700,fffffd806f65ca48,0,0,fffffd806f65c9d8) at ip6_output+0xd26 rip6_output(fffffd807deb0200,fffffd806c869a90,ffff800022d98ba0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806c869a90,9,fffffd807deb0200,0,0,ffff800020ad7160) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806c869a90,0,ffff800022d98df8,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ad7160,3,ffff800022d98df8,0,ffff800022d98ee0) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ad7160,ffff800022d98e98,ffff800022d98ee0) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800022d98f60) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800022d98f60) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xb443db583a0, count: -18 ddb{1}> show registers rdi 0xffffffff821a0357 db_enter+0x17 rsi 0xddd rbp 0xffff800022d98360 rbx 0xffff800022d98410 rdx 0xdde rcx 0xffff800021b7c000 rax 0xffff800021b7c000 r8 0xffffffff8165bfff kprintf+0x16f r9 0x1 r10 0x25 r11 0xe44c6922fae4e5b r12 0x3000000008 r13 0xffff800022d98370 r14 0x100 r15 0x1 rip 0xffffffff821a0358 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800022d98350 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=37935 stat=onproc flags process=0 proc=4000000 pri=60, usrpri=60, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad6780,0xffffffff82631488 process=0xffff800020af58d0 user=0xffff800022d94000, vmspace=0xfffffd807f000730 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 95932 327266 22968 0 7 0 syz-executor.1 *95932 37935 22968 0 7 0x4000000 syz-executor.1 68422 299949 90960 0 3 0x80 nanosleep syz-executor.0 68422 298749 90960 0 3 0x4000080 netio syz-executor.0 68422 48138 90960 0 3 0x4000080 fsleep syz-executor.0 22968 148395 21814 0 3 0x82 nanosleep syz-executor.1 90960 357755 21814 0 3 0x82 nanosleep syz-executor.0 21814 90861 81960 0 3 0x82 nanosleep syz-fuzzer 21814 13599 81960 0 3 0x4000082 nanosleep syz-fuzzer 21814 42644 81960 0 3 0x4000082 thrsleep syz-fuzzer 21814 416174 81960 0 3 0x4000082 thrsleep syz-fuzzer 21814 120495 81960 0 3 0x4000082 thrsleep syz-fuzzer 21814 472577 81960 0 3 0x4000082 thrsleep syz-fuzzer 21814 413021 81960 0 3 0x4000082 thrsleep syz-fuzzer 21814 92712 81960 0 3 0x4000082 thrsleep syz-fuzzer 21814 70037 81960 0 3 0x4000082 kqread syz-fuzzer 21814 698 81960 0 3 0x4000082 thrsleep syz-fuzzer 81960 290215 18272 0 3 0x10008a pause ksh 18272 439566 62152 0 3 0x92 select sshd 27739 196594 1 0 3 0x100083 ttyin getty 62152 257672 1 0 3 0x80 select sshd 32146 288316 26916 74 3 0x100092 bpf pflogd 26916 383356 1 0 3 0x80 netio pflogd 10283 289844 84990 73 3 0x100090 kqread syslogd 84990 248872 1 0 3 0x100082 netio syslogd 98334 450637 1 77 3 0x100090 poll dhclient 64050 244727 1 0 3 0x80 poll dhclient 70583 518632 0 0 3 0x14200 pgzero zerothread 84477 378349 0 0 3 0x14200 aiodoned aiodoned 21142 418428 0 0 3 0x14200 syncer update 91410 277644 0 0 3 0x14200 cleaner cleaner 65310 187696 0 0 3 0x14200 reaper reaper 94490 345299 0 0 3 0x14200 pgdaemon pagedaemon 56626 190129 0 0 3 0x14200 bored crynlk 53310 259237 0 0 3 0x14200 bored crypto 59561 394176 0 0 3 0x40014200 acpi0 acpi0 68483 336416 0 0 3 0x40014200 idle1 14822 510913 0 0 3 0x14200 bored softnet 10926 40356 0 0 3 0x14200 bored systqmp 72035 137160 0 0 3 0x14200 bored systq 2207 356994 0 0 3 0x40014200 bored softclock 75647 276542 0 0 3 0x40014200 idle0 90133 245541 0 0 3 0x14200 bored smr 1 165640 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 95932 (syz-executor.1) thread 0xffff800020ad7160 (37935) exclusive rwlock netlock r = 0 (0xffffffff824943a8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x559 sys/kern/uipc_socket.c:512 #3 dofilewritev+0x1b7 sys/kern/sys_generic.c:364 #4 sys_write+0x83 sys/kern/sys_generic.c:284 #5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #6 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9501 6409K 6926K 78643K 10900 0 pcb 18 8K 8K 78643K 50 0 rtable 107 4K 4K 78643K 252 0 ifaddr 64 13K 13K 78643K 83 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 16K 78643K 27 0 mount 1 1K 1K 78643K 1 0 vnodes 1215 76K 77K 78643K 1305 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 94 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 142 0 proc 61 63K 83K 78643K 445 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 0 0K 0K 78643K 6 0 in_multi 42 2K 2K 78643K 51 0 ether_multi 1 0K 0K 78643K 2 0 mrt 0 0K 0K 78643K 3 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 217 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 130 39K 39K 78643K 1420 0 UVM aobj 10 2K 2K 78643K 10 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 4 0K 0K 78643K 26 0 NDP 11 0K 0K 78643K 17 0 temp 86 3012K 3080K 78643K 5196 0 kqueue 0 0K 0K 78643K 2 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> 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 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 28 0 26 1 0 1 1 0 8 0 rtentry 112 50 0 8 2 0 2 2 0 8 0 unpcb 120 57 0 47 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 128 0 128 1 1 0 1 0 8 0 tcpcb 544 62 0 57 1 0 1 1 0 8 0 inpcb 280 201 0 189 1 0 1 1 0 8 0 rttmr 72 1 0 1 1 0 1 1 0 8 1 nd6 48 5 0 2 1 0 1 1 0 8 0 ppxss 1128 1 0 1 1 0 1 1 0 8 1 pffrag 232 2 0 2 1 0 1 1 0 482 1 pffrnode 88 2 0 2 1 0 1 1 0 8 1 pffrent 40 6 0 6 1 0 1 1 0 8 1 pfosfp 40 846 0 423 5 0 5 5 0 8 0 pfosfpen 112 1428 0 714 21 0 21 21 0 8 0 pfstitem 24 24 0 0 1 0 1 1 0 8 0 pfstkey 112 24 0 0 1 0 1 1 0 8 0 pfstate 328 24 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 236 0 39 14 0 14 14 0 8 1 art_table 32 237 0 39 2 0 2 2 0 8 0 art_node 16 49 0 10 1 0 1 1 0 8 0 semupl 112 1 0 1 1 0 1 1 0 8 1 semapl 112 91 0 81 1 0 1 1 0 8 0 shmpl 112 8 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1591 0 184 46 0 46 46 0 8 0 ffsino 272 1591 0 184 95 0 95 95 0 8 0 nchpl 144 2051 0 434 61 0 61 61 0 8 0 uvmvnodes 72 1701 0 0 31 0 31 31 0 8 0 vnodes 208 1701 0 0 90 0 90 90 0 8 0 namei 1024 5506 0 5506 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 4 0 0 1 0 1 1 0 8 0 vmpool 560 4 0 0 1 0 1 1 0 8 0 scsiplug 64 2 0 2 1 0 1 1 0 8 1 scxspl 192 5502 0 5502 8 1 7 7 0 8 7 plimitpl 152 21 0 13 1 0 1 1 0 8 0 sigapl 432 341 0 325 3 1 2 3 0 8 0 futexpl 56 2884 0 2883 1 0 1 1 0 8 0 knotepl 112 76 0 57 1 0 1 1 0 8 0 kqueuepl 104 36 0 34 1 0 1 1 0 8 0 pipepl 112 192 0 173 1 0 1 1 0 8 0 fdescpl 488 342 0 325 3 0 3 3 0 8 0 filepl 152 2149 0 2044 5 0 5 5 0 8 0 lockfpl 104 51 0 50 1 0 1 1 0 8 0 lockfspl 48 23 0 22 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 148 0 139 1 0 1 1 0 8 0 zombiepl 144 325 0 325 1 0 1 1 0 8 1 processpl 904 357 0 325 4 0 4 4 0 8 0 procpl 632 628 0 584 5 0 5 5 0 8 1 sockpl 384 291 0 267 3 0 3 3 0 8 0 mcl64k 65536 5 0 0 1 0 1 1 0 8 0 mcl16k 16384 2 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 222 0 0 27 0 27 27 0 8 0 mtagpl 80 13 0 0 1 0 1 1 0 8 0 mbufpl 256 232 0 0 14 0 14 14 0 8 0 bufpl 280 6443 0 1340 365 0 365 365 0 8 0 anonpl 16 53248 0 33835 96 1 95 95 0 125 16 amapchunkpl 152 1728 0 1567 8 0 8 8 0 158 0 amappl16 192 1844 0 783 66 0 66 66 0 8 12 amappl15 184 112 0 106 1 0 1 1 0 8 0 amappl14 176 28 0 27 1 0 1 1 0 8 0 amappl12 160 15 0 11 2 1 1 1 0 8 0 amappl11 152 56 0 41 1 0 1 1 0 8 0 amappl10 144 68 0 61 1 0 1 1 0 8 0 amappl9 136 607 0 603 1 0 1 1 0 8 0 amappl8 128 129 0 101 2 0 2 2 0 8 0 amappl7 120 166 0 152 1 0 1 1 0 8 0 amappl6 112 56 0 51 1 0 1 1 0 8 0 amappl5 104 129 0 114 1 0 1 1 0 8 0 amappl4 96 595 0 562 1 0 1 1 0 8 0 amappl3 88 119 0 112 1 0 1 1 0 8 0 amappl2 80 1872 0 1787 3 1 2 3 0 8 0 amappl1 72 17661 0 17195 25 12 13 20 0 8 3 amappl 80 886 0 834 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 9 0 0 1 0 1 1 0 8 0 uaddrrnd 24 346 0 325 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 346 0 325 1 0 1 1 0 8 0 vmmpekpl 168 6478 0 6443 2 0 2 2 0 8 0 vmmpepl 168 50065 0 47696 140 6 134 135 0 357 30 vmsppl 368 345 0 325 2 0 2 2 0 8 0 pdppl 4096 699 0 654 6 0 6 6 0 8 0 pvpl 32 166346 0 143678 221 0 221 221 0 265 37 pmappl 232 345 0 325 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 176 0 3 5 0 5 5 0 8 0