panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *384198 53592 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8222bdcf) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8052bab400,6f8,8,fffffd8052babb20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8052bab400,6f8,8,fffffd8052babb20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8052bab400,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8067954af8,fffffd8052bab400,ffff80001d411e60) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d4120b8,ffff80001d4120c4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d4120b8,ffff80001d4120c4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d4120b8,ffff80001d4120c4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8052bab400) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8052bab400,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8052bab200,ffff800000a97500,fffffd8067954d98,0,0,fffffd8067954d28) at ip6_output+0xd02 rip6_output(fffffd8052bab200,fffffd8053dcee20,ffff80001d412420,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8053dcee20,9,fffffd8052bab200,0,0,ffff80001d36d9d8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8053dcee20,0,ffff80001d412668,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 end trace frame: 0xffff80001d412650, 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(ffffffff8222bdcf) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8052bab400,6f8,8,fffffd8052babb20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8052bab400,6f8,8,fffffd8052babb20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8052bab400,6f8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1169 ip6_savecontrol(fffffd8067954af8,fffffd8052bab400,ffff80001d411e60) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff80001d4120b8,ffff80001d4120c4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001d4120b8,ffff80001d4120c4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001d4120b8,ffff80001d4120c4,29,0,ffff80000017a2a8) at ip6_input_if+0xf26 ipv6_input(ffff80000017a2a8,fffffd8052bab400) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff80000017a2a8,fffffd8052bab400,18) at if_input_local+0x121 sys/net/if.c:780 ip6_output(fffffd8052bab200,ffff800000a97500,fffffd8067954d98,0,0,fffffd8067954d28) at ip6_output+0xd02 rip6_output(fffffd8052bab200,fffffd8053dcee20,ffff80001d412420,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8053dcee20,9,fffffd8052bab200,0,0,ffff80001d36d9d8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8053dcee20,0,ffff80001d412668,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:549 dofilewritev(ffff80001d36d9d8,5,ffff80001d412668,0,ffff80001d412750) at dofilewritev+0x1ab sys/kern/sys_generic.c:364 sys_write(ffff80001d36d9d8,ffff80001d412708,ffff80001d412750) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001d4127d0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:570 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x5eec28f3720, count: -18 ddb> show registers rdi 0xffffffff81008d67 db_enter+0x17 rsi 0x2e5d __ALIGN_SIZE+0x1e5d rbp 0xffff80001d411bd0 rbx 0xffff80001d411c80 rdx 0x2e5e __ALIGN_SIZE+0x1e5e rcx 0xffff800020649000 rax 0xffff800020649000 r8 0xffff80001d411b90 r9 0x1 r10 0xffff8000009facc0 r11 0x3dac9d79d88fa37 r12 0x3000000008 r13 0xffff80001d411be0 r14 0x100 r15 0x1 rip 0xffffffff81008d68 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d411bc0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=384198 stat=onproc flags process=0 proc=4000000 pri=32, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff80001d36eae8,0xffffffff82550f40 process=0xffff8000ffffbc10 user=0xffff80001d40d000, vmspace=0xfffffd8055675668 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 53592 404172 33050 0 2 0 syz-executor.0 *53592 384198 33050 0 7 0x4000000 syz-executor.0 33050 436342 20947 0 3 0x82 nanosleep syz-executor.0 62704 222930 0 0 3 0x14200 acct acct 10731 193213 0 0 3 0x14200 bored sosplice 90122 183930 20947 0 2 0x2 syz-executor.1 20947 503332 46460 0 3 0x82 thrsleep syz-fuzzer 20947 412513 46460 0 3 0x4000082 nanosleep syz-fuzzer 20947 397398 46460 0 3 0x4000082 thrsleep syz-fuzzer 20947 412714 46460 0 3 0x4000082 thrsleep syz-fuzzer 20947 420756 46460 0 3 0x4000082 thrsleep syz-fuzzer 20947 69749 46460 0 3 0x4000082 thrsleep syz-fuzzer 20947 412679 46460 0 3 0x4000082 thrsleep syz-fuzzer 20947 302226 46460 0 3 0x4000082 kqread syz-fuzzer 46460 191276 8048 0 3 0x10008a pause ksh 8048 220955 2986 0 3 0x92 select sshd 2964 365711 1 0 3 0x100083 ttyin getty 2986 389690 1 0 3 0x80 select sshd 31543 113882 29146 73 3 0x100090 kqread syslogd 29146 39099 1 0 3 0x100082 netio syslogd 719 231960 1 77 3 0x100090 poll dhclient 80757 5426 1 0 3 0x80 poll dhclient 49018 42998 0 0 2 0x14200 zerothread 25365 143351 0 0 3 0x14200 aiodoned aiodoned 80209 473956 0 0 3 0x14200 syncer update 89361 57086 0 0 3 0x14200 cleaner cleaner 20446 280657 0 0 3 0x14200 reaper reaper 77177 370627 0 0 3 0x14200 pgdaemon pagedaemon 87307 228481 0 0 3 0x14200 bored crynlk 27741 240817 0 0 3 0x14200 bored crypto 6470 481090 0 0 3 0x40014200 acpi0 acpi0 8168 327247 0 0 3 0x14200 bored softnet 41436 365862 0 0 3 0x14200 bored systqmp 83437 119501 0 0 3 0x14200 bored systq 37283 347277 0 0 3 0x40014200 bored softclock 52134 457695 0 0 3 0x40014200 idle0 91222 280286 0 0 3 0x14200 bored smr 1 450884 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 9541 6367K 7052K 78643K 12841 0 pcb 16 10K 12K 78643K 196 0 rtable 126 4K 5K 78643K 683 0 ifaddr 115 22K 23K 78643K 273 0 counters 21 16K 16K 78643K 48 0 ioctlops 0 0K 2K 78643K 81 0 iov 0 0K 16K 78643K 211 0 mount 1 1K 1K 78643K 1 0 vnodes 1234 78K 78K 78643K 2038 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 15 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 1K 78643K 159 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 1710 0 sigio 0 0K 0K 78643K 34 0 proc 49 38K 55K 78643K 469 0 subproc 32 2K 2K 78643K 55 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 1 0K 0K 78643K 387 0 in_multi 128 5K 5K 78643K 318 0 ether_multi 2 0K 0K 78643K 30 0 mrt 0 0K 0K 78643K 6 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 61 281K 281K 78643K 61 0 exec 0 0K 1K 78643K 280 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 120 70K 87K 78643K 4671 0 UVM aobj 56 8K 8K 78643K 62 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 290 0 NDP 17 0K 0K 78643K 56 0 temp 151 3019K 3086K 78643K 23419 0 kqueue 3 4K 19K 78643K 83 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 20 0 4 1 0 1 1 0 8 0 rtpcb 80 369 0 367 1 0 1 1 0 8 0 rtentry 112 101 0 48 2 0 2 2 0 8 0 unpcb 120 1374 0 1366 1 0 1 1 0 8 0 syncache 264 15 0 15 5 4 1 1 0 8 1 tcpqe 32 41 0 41 5 4 1 1 0 8 1 tcpcb 544 1410 0 1401 20 18 2 15 0 8 1 ipq 40 130 0 42 4 2 2 2 0 8 0 ipqe 40 332 0 244 4 2 2 2 0 8 0 inpcb 280 3624 0 3595 11 8 3 9 0 8 0 ip6q 72 2 0 2 1 1 0 1 0 8 0 ip6af 40 6 0 6 1 1 0 1 0 8 0 nd6 48 13 0 11 1 0 1 1 0 8 0 pkpcb 40 2 0 2 1 1 0 1 0 8 0 ppxss 1128 5 0 5 3 2 1 1 0 8 1 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 476 0 235 21 4 17 17 0 8 0 art_table 32 478 0 235 3 0 3 3 0 8 0 art_node 16 100 0 51 1 0 1 1 0 8 0 sysvmsgpl 40 16 0 6 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 157 0 147 1 0 1 1 0 8 0 shmpl 112 60 0 6 2 0 2 2 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 3585 0 2190 46 0 46 46 0 8 0 ffsino 240 3585 0 2190 83 0 83 83 0 8 0 nchpl 144 5881 0 4285 60 0 60 60 0 8 0 uvmvnodes 72 4224 0 0 77 0 77 77 0 8 0 vnodes 208 4224 0 0 223 0 223 223 0 8 0 namei 1024 16503 0 16503 1 0 1 1 0 8 1 vcpupl 1984 6 0 0 1 0 1 1 0 8 0 vmpool 528 12 0 6 1 0 1 1 0 8 0 scsiplug 64 3 0 3 2 2 0 1 0 8 0 scxspl 192 18759 0 18759 1 0 1 1 0 8 1 plimitpl 152 71 0 64 1 0 1 1 0 8 0 sigapl 432 1878 0 1865 2 0 2 2 0 8 0 futexpl 56 37266 0 37266 1 0 1 1 0 8 1 knotepl 112 166 0 147 1 0 1 1 0 8 0 kqueuepl 104 468 0 466 4 3 1 4 0 8 0 pipelkpl 16 1442 0 1432 1 0 1 1 0 8 0 pipepl 120 2884 0 2865 5 3 2 2 0 8 1 fdescpl 432 1879 0 1865 2 0 2 2 0 8 0 filepl 120 14620 0 14521 14 9 5 11 0 8 2 lockfpl 104 309 0 308 1 0 1 1 0 8 0 lockfspl 48 105 0 104 1 0 1 1 0 8 0 sessionpl 112 18 0 8 1 0 1 1 0 8 0 pgrppl 48 99 0 89 1 0 1 1 0 8 0 ucredpl 96 1232 0 1225 1 0 1 1 0 8 0 zombiepl 144 1865 0 1865 1 0 1 1 0 8 1 processpl 896 1895 0 1865 4 0 4 4 0 8 0 procpl 624 3845 0 3807 4 0 4 4 0 8 0 sosppl 128 8 0 8 3 2 1 1 0 8 1 sockpl 400 5401 0 5377 18 14 4 14 0 8 1 mcl64k 65536 292 0 198 17 0 17 17 0 8 3 mcl16k 16384 11 0 11 3 2 1 1 0 8 1 mcl12k 12288 40 0 40 2 1 1 1 0 8 1 mcl9k 9216 27 0 27 5 4 1 1 0 8 1 mcl8k 8192 75 0 75 2 1 1 1 0 8 1 mcl4k 4096 302 0 302 2 1 1 1 0 8 1 mcl2k2 2112 10 0 10 3 3 0 1 0 8 0 mcl2k 2048 67377 0 67336 17 6 11 11 0 8 5 mtagpl 80 122 0 65 3 1 2 2 0 8 0 mbufpl 256 131139 0 130279 69 11 58 60 0 8 0 bufpl 280 7594 0 2184 387 0 387 387 0 8 0 anonpl 16 155520 0 138831 85 12 73 77 0 107 4 amapchunkpl 152 7910 0 7780 29 10 19 19 0 158 13 amappl16 192 8049 0 7131 67 20 47 59 0 8 0 amappl15 184 1166 0 1157 1 0 1 1 0 8 0 amappl14 176 897 0 893 1 0 1 1 0 8 0 amappl12 160 245 0 245 2 2 0 1 0 8 0 amappl11 152 53 0 42 1 0 1 1 0 8 0 amappl10 144 11 0 9 1 0 1 1 0 8 0 amappl9 136 562 0 559 1 0 1 1 0 8 0 amappl8 128 139 0 112 1 0 1 1 0 8 0 amappl7 120 97 0 86 1 0 1 1 0 8 0 amappl6 112 55 0 49 1 0 1 1 0 8 0 amappl5 104 419 0 408 1 0 1 1 0 8 0 amappl4 96 998 0 967 1 0 1 1 0 8 0 amappl3 88 2129 0 2120 1 0 1 1 0 8 0 amappl2 80 14758 0 14685 3 1 2 3 0 8 0 amappl1 72 41875 0 41455 26 16 10 20 0 8 0 amappl 80 4127 0 4084 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 61 0 6 1 0 1 1 0 8 0 uaddrrnd 24 1891 0 1871 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 1891 0 1871 1 0 1 1 0 8 0 vmmpekpl 168 17804 0 17775 2 0 2 2 0 8 0 vmmpepl 168 222629 0 220607 146 51 95 123 0 357 4 vmsppl 272 1890 0 1871 2 0 2 2 0 8 0 pdppl 4096 3788 0 3748 7 1 6 6 0 8 0 pvpl 32 444336 0 424618 209 33 176 188 0 265 15 pmappl 200 1890 0 1871 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 273 0 60 7 0 7 7 0 8 0