login: panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 61176 20927 0 0 0 0 syz-executor.1 *501152 20927 0 0 0x4000000 1 syz-executor.1 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822460e2) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806e2dda00,198,2,ffff800021ba32b8) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806e2dda00,198,2,ffff800021ba32b8) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806e2dda00,198,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1152 ip6_savecontrol(fffffd806f666c08,fffffd806e2dda00,ffff800021ba3420) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800021ba3668,ffff800021ba3674,0,18) at rip6_input+0x50b sys/netinet6/raw_ip6.c:206 ip_deliver(ffff800021ba3668,ffff800021ba3674,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800021ba3668,ffff800021ba3674,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806f0bb600) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806f0bb600,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd807f01f400,ffff800000a1ca00,fffffd806f666d90,0,0,fffffd806f666d20) at ip6_output+0xd26 rip6_output(fffffd806d496b00,fffffd8063400318,ffff800021ba39d0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8063400318,9,fffffd806d496b00,0,0,ffff800020ae6c78) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8063400318,0,ffff800021ba3c28,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 end trace frame: 0xffff800021ba3c10, 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(ffffffff822460e2) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806e2dda00,198,2,ffff800021ba32b8) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806e2dda00,198,2,ffff800021ba32b8) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806e2dda00,198,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1152 ip6_savecontrol(fffffd806f666c08,fffffd806e2dda00,ffff800021ba3420) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800021ba3668,ffff800021ba3674,0,18) at rip6_input+0x50b sys/netinet6/raw_ip6.c:206 ip_deliver(ffff800021ba3668,ffff800021ba3674,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800021ba3668,ffff800021ba3674,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806f0bb600) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806f0bb600,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd807f01f400,ffff800000a1ca00,fffffd806f666d90,0,0,fffffd806f666d20) at ip6_output+0xd26 rip6_output(fffffd806d496b00,fffffd8063400318,ffff800021ba39d0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8063400318,9,fffffd806d496b00,0,0,ffff800020ae6c78) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8063400318,0,ffff800021ba3c28,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ae6c78,4,ffff800021ba3c28,0,ffff800021ba3d10) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ae6c78,ffff800021ba3cc8,ffff800021ba3d10) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800021ba3d90) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021ba3d90) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x23df28a4820, count: -18 ddb{1}> show registers rdi 0xffffffff817710b7 db_enter+0x17 rsi 0x1c5d __ALIGN_SIZE+0xc5d rbp 0xffff800021ba3190 rbx 0xffff800021ba3240 rdx 0x1c5e __ALIGN_SIZE+0xc5e rcx 0xffff800022d7c000 rax 0xffff800022d7c000 r8 0xffffffff81617f6f kprintf+0x16f r9 0x1 r10 0x25 r11 0x78fa0ce8179dbf7 r12 0x3000000008 r13 0xffff800021ba31a0 r14 0x100 r15 0x1 rip 0xffffffff817710b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021ba3180 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.1) pid=501152 stat=onproc flags process=0 proc=4000000 pri=57, usrpri=57, nice=20 forw=0xffffffffffffffff, list=0xffff800020ae6510,0xffffffff8261e778 process=0xffff800020af51c0 user=0xffff800021b9e000, vmspace=0xfffffd807f000a10 estcpu=28, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 20927 61176 70784 0 7 0 syz-executor.1 *20927 501152 70784 0 7 0x4000000 syz-executor.1 77258 272728 75016 0 3 0x80 nanosleep syz-executor.0 77258 151942 75016 0 3 0x4000080 pipewr syz-executor.0 77258 393154 75016 0 3 0x4000080 fsleep syz-executor.0 70784 418188 82042 0 3 0x82 nanosleep syz-executor.1 75016 414154 82042 0 3 0x82 nanosleep syz-executor.0 82042 314397 26952 0 3 0x82 thrsleep syz-fuzzer 82042 66256 26952 0 3 0x4000082 nanosleep syz-fuzzer 82042 432533 26952 0 3 0x4000082 thrsleep syz-fuzzer 82042 388236 26952 0 3 0x4000082 thrsleep syz-fuzzer 82042 405391 26952 0 3 0x4000082 thrsleep syz-fuzzer 82042 275913 26952 0 3 0x4000082 nanosleep syz-fuzzer 82042 7668 26952 0 3 0x4000082 thrsleep syz-fuzzer 82042 504454 26952 0 3 0x4000082 thrsleep syz-fuzzer 82042 208224 26952 0 3 0x4000082 thrsleep syz-fuzzer 82042 311861 26952 0 3 0x4000082 kqread syz-fuzzer 26952 377733 90595 0 3 0x10008a pause ksh 90595 131831 80678 0 3 0x92 select sshd 97671 139656 1 0 3 0x100083 ttyin getty 80678 154541 1 0 3 0x80 select sshd 70962 38973 55396 74 3 0x100092 bpf pflogd 55396 66115 1 0 3 0x80 netio pflogd 86835 434087 95302 73 3 0x100090 kqread syslogd 95302 395030 1 0 3 0x100082 netio syslogd 30135 458328 1 77 3 0x100090 poll dhclient 61448 419787 1 0 3 0x80 poll dhclient 68341 24517 0 0 3 0x14200 pgzero zerothread 75821 472648 0 0 3 0x14200 aiodoned aiodoned 73739 179270 0 0 3 0x14200 syncer update 68887 255843 0 0 3 0x14200 cleaner cleaner 70177 288176 0 0 3 0x14200 reaper reaper 55642 231864 0 0 3 0x14200 pgdaemon pagedaemon 65707 467082 0 0 3 0x14200 bored crynlk 52070 186950 0 0 3 0x14200 bored crypto 72823 65191 0 0 3 0x40014200 acpi0 acpi0 84190 14890 0 0 3 0x40014200 idle1 8809 248 0 0 3 0x14200 bored softnet 29395 109485 0 0 3 0x14200 bored systqmp 70716 258273 0 0 3 0x14200 bored systq 95444 433501 0 0 3 0x40014200 bored softclock 85073 25788 0 0 3 0x40014200 idle0 87148 81912 0 0 3 0x14200 bored smr 1 38514 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 20927 (syz-executor.1) thread 0xffff800020ae6c78 (501152) exclusive rwlock netlock r = 0 (0xffffffff824f73e8) #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 9481 6401K 6917K 78643K 10684 0 pcb 18 8K 8K 78643K 40 0 rtable 105 3K 3K 78643K 245 0 ifaddr 49 11K 11K 78643K 61 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1470 0 iov 1 8K 48K 78643K 25 0 mount 1 1K 1K 78643K 1 0 vnodes 1221 77K 77K 78643K 1270 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 1K 1K 78643K 2 0 sem 2 0K 0K 78643K 4 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 82 0 proc 60 63K 83K 78643K 492 0 subproc 32 2K 2K 78643K 51 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 2 0 in_multi 33 2K 2K 78643K 47 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 49 228K 228K 78643K 49 0 exec 0 0K 1K 78643K 224 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 112 21K 23K 78643K 1222 0 UVM aobj 2 2K 2K 78643K 2 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 7 0K 0K 78643K 14 0 temp 79 3013K 3078K 78643K 9384 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 8 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 21 0 19 1 0 1 1 0 8 0 rtentry 112 55 0 11 2 0 2 2 0 8 0 unpcb 120 35 0 25 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 48 0 48 1 1 0 1 0 8 0 tcpcb 544 24 0 19 1 0 1 1 0 8 0 inpcb 280 104 0 92 2 0 2 2 0 8 1 nd6 48 6 0 2 1 0 1 1 0 8 0 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 16 0 3 1 0 1 1 0 8 0 pfstkey 112 16 0 3 1 0 1 1 0 8 0 pfstate 328 16 0 3 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 256 255 0 43 14 0 14 14 0 8 0 art_table 32 256 0 43 2 0 2 2 0 8 0 art_node 16 54 0 14 1 0 1 1 0 8 0 sysvmsgpl 40 4 0 4 1 0 1 1 0 8 1 semapl 112 2 0 2 1 0 1 1 0 8 1 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1485 0 77 46 0 46 46 0 8 0 ffsino 272 1485 0 77 95 0 95 95 0 8 0 nchpl 144 1773 0 164 61 0 61 61 0 8 0 uvmvnodes 72 1572 0 0 29 0 29 29 0 8 0 vnodes 208 1572 0 0 83 0 83 83 0 8 0 namei 1024 4755 0 4755 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5140 0 5140 8 1 7 7 0 8 7 plimitpl 152 16 0 8 1 0 1 1 0 8 0 sigapl 432 278 0 262 3 0 3 3 0 8 1 futexpl 56 738 0 737 1 0 1 1 0 8 0 knotepl 112 69 0 50 1 0 1 1 0 8 0 kqueuepl 104 6 0 4 1 0 1 1 0 8 0 pipepl 112 256 0 235 2 0 2 2 0 8 1 fdescpl 488 279 0 262 3 0 3 3 0 8 0 filepl 152 1561 0 1453 6 0 6 6 0 8 1 lockfpl 104 22 0 21 1 0 1 1 0 8 0 lockfspl 48 9 0 8 1 0 1 1 0 8 0 sessionpl 112 19 0 8 1 0 1 1 0 8 0 pgrppl 48 19 0 8 1 0 1 1 0 8 0 ucredpl 96 96 0 87 1 0 1 1 0 8 0 zombiepl 144 262 0 262 1 0 1 1 0 8 1 processpl 904 294 0 262 4 0 4 4 0 8 0 procpl 632 409 0 365 5 0 5 5 0 8 0 srpgc 64 2 0 2 1 0 1 1 0 8 1 sockpl 384 160 0 136 4 0 4 4 0 8 1 mcl64k 65536 8 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 3 0 0 1 0 1 1 0 8 0 mcl4k 4096 6 0 0 1 0 1 1 0 8 0 mcl2k 2048 163 0 0 20 0 20 20 0 8 0 mtagpl 80 6 0 0 1 0 1 1 0 8 0 mbufpl 256 190 0 0 11 0 11 11 0 8 0 bufpl 280 6568 0 1340 374 0 374 374 0 8 0 anonpl 16 44784 0 28957 74 1 73 73 0 125 1 amapchunkpl 152 1674 0 1532 14 0 14 14 0 158 6 amappl16 192 1241 0 256 51 1 50 50 0 8 0 amappl15 184 68 0 64 1 0 1 1 0 8 0 amappl14 176 37 0 35 1 0 1 1 0 8 0 amappl13 168 8 0 7 1 0 1 1 0 8 0 amappl12 160 16 0 14 1 0 1 1 0 8 0 amappl11 152 62 0 47 1 0 1 1 0 8 0 amappl10 144 30 0 24 1 0 1 1 0 8 0 amappl9 136 634 0 629 1 0 1 1 0 8 0 amappl8 128 132 0 112 1 0 1 1 0 8 0 amappl7 120 127 0 112 1 0 1 1 0 8 0 amappl6 112 56 0 51 1 0 1 1 0 8 0 amappl5 104 132 0 119 1 0 1 1 0 8 0 amappl4 96 534 0 501 2 1 1 2 0 8 0 amappl3 88 113 0 106 1 0 1 1 0 8 0 amappl2 80 1255 0 1171 3 1 2 3 0 8 0 amappl1 72 16417 0 15951 26 14 12 21 0 8 2 amappl 80 678 0 631 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 279 0 262 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 279 0 262 1 0 1 1 0 8 0 vmmpekpl 168 6398 0 6368 2 0 2 2 0 8 0 vmmpepl 168 43075 0 40811 144 7 137 137 0 357 38 vmsppl 368 278 0 262 2 0 2 2 0 8 0 pdppl 4096 565 0 524 6 0 6 6 0 8 0 pvpl 32 148017 0 128872 176 0 176 176 0 265 4 pmappl 232 278 0 262 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 166 0 3 5 0 5 5 0 8 0