login: panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *384192 21906 0 0x2 0 1 syz-executor9695 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822419e2) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd80771a7700,6f8,8,fffffd806d68e420) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd80771a7700,6f8,8,fffffd806d68e420) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd80771a7700,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1149 ip6_savecontrol(fffffd806f672578,fffffd80771a7700,ffff800020b134e0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1036 rip6_input(ffff800020b13738,ffff800020b13744,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800020b13738,ffff800020b13744,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800020b13738,ffff800020b13744,29,0,ffff800000670000) at ip6_input_if+0x17cb ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800020b13738,ffff800020b13744,29,0,ffff800000670000) at ip6_input_if+0x17cb sys/netinet6/ip6_input.c:340 ipv6_input(ffff800000670000,fffffd80771a7700) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000670000,fffffd80771a7700,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd806dba7e00,ffff8000006bd080,fffffd806f6724d0,0,0,fffffd806f672460) at ip6_output+0xd26 rip6_output(fffffd806dba7e00,fffffd806d3a9d90,ffff800020b13aa0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806d3a9d90,9,fffffd806dba7e00,0,0,ffff800020ad0500) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806d3a9d90,0,ffff800020b13ce8,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 end trace frame: 0xffff800020b13cd0, 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(ffffffff822419e2) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd80771a7700,6f8,8,fffffd806d68e420) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd80771a7700,6f8,8,fffffd806d68e420) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd80771a7700,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1149 ip6_savecontrol(fffffd806f672578,fffffd80771a7700,ffff800020b134e0) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1036 rip6_input(ffff800020b13738,ffff800020b13744,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800020b13738,ffff800020b13744,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:665 ip6_input_if(ffff800020b13738,ffff800020b13744,29,0,ffff800000670000) at ip6_input_if+0x17cb ip6_ours sys/netinet6/ip6_input.c:518 [inline] ip6_input_if(ffff800020b13738,ffff800020b13744,29,0,ffff800000670000) at ip6_input_if+0x17cb sys/netinet6/ip6_input.c:340 ipv6_input(ffff800000670000,fffffd80771a7700) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000670000,fffffd80771a7700,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd806dba7e00,ffff8000006bd080,fffffd806f6724d0,0,0,fffffd806f672460) at ip6_output+0xd26 rip6_output(fffffd806dba7e00,fffffd806d3a9d90,ffff800020b13aa0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806d3a9d90,9,fffffd806dba7e00,0,0,ffff800020ad0500) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806d3a9d90,0,ffff800020b13ce8,0,0,0) at sosend+0x645 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ad0500,4,ffff800020b13ce8,0,ffff800020b13dd0) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ad0500,ffff800020b13d88,ffff800020b13dd0) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800020b13e50) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800020b13e50) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe7ba0, count: -18 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b13250 rbx 0xffff800020b13300 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81ff23ef kprintf+0x16f r9 0x1 r10 0x2b405d60ae5dd269 r11 0xf14a09c39e5066ba r12 0x3000000008 r13 0xffff800020b13260 r14 0x100 r15 0x1 rip 0xffffffff81cee8a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b13240 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor9695) pid=384192 stat=onproc flags process=2 proc=0 pri=53, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad09f0,0xffffffff82613fb8 process=0xffff800020a9b190 user=0xffff800020b0e000, vmspace=0xfffffd806e7ad5c8 estcpu=3, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND *21906 384192 67137 0 7 0x2 syz-executor9695 67137 91078 50643 0 3 0x10008a pause ksh 50643 95182 21006 0 3 0x92 select sshd 30597 7128 1 0 3 0x100083 ttyin getty 21006 79850 1 0 3 0x80 select sshd 10137 266082 52520 74 3 0x100092 bpf pflogd 52520 471173 1 0 3 0x80 netio pflogd 70986 181849 58520 73 3 0x100090 kqread syslogd 58520 311966 1 0 3 0x100082 netio syslogd 88701 416238 1 77 3 0x100090 poll dhclient 22055 508470 1 0 3 0x80 poll dhclient 11562 393212 0 0 3 0x14200 pgzero zerothread 99284 492304 0 0 3 0x14200 aiodoned aiodoned 59224 490513 0 0 3 0x14200 syncer update 89752 406032 0 0 3 0x14200 cleaner cleaner 70467 290736 0 0 3 0x14200 reaper reaper 22488 131165 0 0 3 0x14200 pgdaemon pagedaemon 43273 153982 0 0 3 0x14200 bored crynlk 40747 20905 0 0 3 0x14200 bored crypto 17145 420889 0 0 3 0x40014200 acpi0 acpi0 70620 417001 0 0 3 0x40014200 idle1 69325 392865 0 0 3 0x14200 bored softnet 18725 266648 0 0 3 0x14200 bored systqmp 34956 200703 0 0 3 0x14200 bored systq 66971 423830 0 0 3 0x40014200 bored softclock 22451 251599 0 0 7 0x40014200 idle0 64542 472073 0 0 3 0x14200 bored smr 1 37629 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 21906 (syz-executor9695) thread 0xffff800020ad0500 (384192) exclusive rwlock netlock r = 0 (0xffffffff824a3a38) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 solock+0x5a sys/kern/uipc_socket2.c:282 #2 sosend+0x51b 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 9461 6393K 6394K 78643K 10552 0 pcb 15 8K 8K 78643K 17 0 rtable 61 2K 2K 78643K 127 0 ifaddr 29 8K 8K 78643K 30 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1467 0 mount 1 1K 1K 78643K 1 0 vnodes 1181 74K 74K 78643K 1186 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 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 1 0K 0K 78643K 1 0 proc 59 63K 71K 78643K 358 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 11 0K 0K 78643K 11 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 18 79K 79K 78643K 18 0 exec 0 0K 1K 78643K 177 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 67 3K 4K 78643K 816 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 2 0K 0K 78643K 2 0 NDP 4 0K 0K 78643K 4 0 temp 27 3003K 3067K 78643K 1978 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 2 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 0 1 1 0 8 1 tcpcb 544 9 0 5 1 0 1 1 0 8 0 inpcb 280 32 0 24 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 9 0 0 1 0 1 1 0 8 0 pfstkey 112 9 0 0 1 0 1 1 0 8 0 pfstate 328 9 0 0 1 0 1 1 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 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1401 0 16 45 0 45 45 0 8 0 ffsino 272 1401 0 16 93 0 93 93 0 8 0 nchpl 144 1577 0 34 58 0 58 58 0 8 0 uvmvnodes 72 1411 0 0 26 0 26 26 0 8 0 vnodes 208 1411 0 0 75 0 75 75 0 8 0 namei 1024 3772 0 3772 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2517 0 2517 2 0 2 2 0 8 2 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 432 204 0 192 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 160 128 0 121 1 0 1 1 0 8 0 fdescpl 488 205 0 192 3 0 3 3 0 8 0 filepl 152 999 0 949 2 0 2 2 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 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 52 0 43 1 0 1 1 0 8 0 zombiepl 144 192 0 192 1 0 1 1 0 8 1 processpl 896 220 0 192 4 0 4 4 0 8 0 procpl 632 220 0 192 3 0 3 3 0 8 0 sockpl 384 76 0 56 3 0 3 3 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 80 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 105 0 0 7 0 7 7 0 8 0 bufpl 280 2200 0 274 138 0 138 138 0 8 0 anonpl 16 19259 0 17999 7 1 6 7 0 125 0 amapchunkpl 152 522 0 485 2 0 2 2 0 158 0 amappl16 192 30 0 28 1 0 1 1 0 8 0 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 15 0 14 1 0 1 1 0 8 0 amappl12 160 1 0 1 1 0 1 1 0 8 1 amappl11 152 53 0 38 1 0 1 1 0 8 0 amappl10 144 7 0 4 1 0 1 1 0 8 0 amappl9 136 422 0 421 1 0 1 1 0 8 0 amappl8 128 69 0 65 1 0 1 1 0 8 0 amappl7 120 76 0 67 1 0 1 1 0 8 0 amappl6 112 50 0 47 1 0 1 1 0 8 0 amappl5 104 126 0 113 1 0 1 1 0 8 0 amappl4 96 460 0 437 1 0 1 1 0 8 0 amappl3 88 109 0 102 1 0 1 1 0 8 0 amappl2 80 824 0 764 2 0 2 2 0 8 0 amappl1 72 13915 0 13483 15 5 10 15 0 8 0 amappl 80 408 0 387 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 205 0 192 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 205 0 192 1 0 1 1 0 8 0 vmmpekpl 168 5356 0 5335 1 0 1 1 0 8 0 vmmpepl 168 29662 0 28797 48 5 43 48 0 357 4 vmsppl 368 204 0 192 2 0 2 2 0 8 0 pdppl 4096 417 0 384 5 0 5 5 0 8 0 pvpl 32 79379 0 76365 28 0 28 28 0 265 3 pmappl 232 204 0 192 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 135 0 3 4 0 4 4 0 8 0