panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *274304 85123 0 0 0x4000000 0 syz-executor.0 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff822235cc) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8056131400,a8,8,fffffd806bc22220) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8056131400,a8,8,fffffd806bc22220) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8056131400,a8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4e1c08,fffffd8056131400,ffff80001e41e080) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e41e2d8,ffff80001e41e2e4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e41e2d8,ffff80001e41e2e4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e41e2d8,ffff80001e41e2e4,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd8056131400) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd8056131400,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd8056131200,ffff8000009d6900,fffffd805e4e1188,0,0,fffffd805e4e1118) at ip6_output+0xd02 rip6_output(fffffd8056131c00,fffffd805541f010,ffff80001e41e640,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805541f010,9,fffffd8056131c00,0,0,ffff8000ffff2ee8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805541f010,0,ffff80001e41e888,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 end trace frame: 0xffff80001e41e870, 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(ffffffff822235cc) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd8056131400,a8,8,fffffd806bc22220) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd8056131400,a8,8,fffffd806bc22220) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd8056131400,a8,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd805e4e1c08,fffffd8056131400,ffff80001e41e080) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff80001e41e2d8,ffff80001e41e2e4,0,18) at rip6_input+0x75b sys/netinet6/raw_ip6.c:225 ip_deliver(ffff80001e41e2d8,ffff80001e41e2e4,0,18) at ip_deliver+0x2e3 sys/netinet/ip_input.c:668 ip6_input_if(ffff80001e41e2d8,ffff80001e41e2e4,29,0,ffff800000677800) at ip6_input_if+0x1055 ipv6_input(ffff800000677800,fffffd8056131400) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000677800,fffffd8056131400,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd8056131200,ffff8000009d6900,fffffd805e4e1188,0,0,fffffd805e4e1118) at ip6_output+0xd02 rip6_output(fffffd8056131c00,fffffd805541f010,ffff80001e41e640,0) at rip6_output+0x4d7 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd805541f010,9,fffffd8056131c00,0,0,ffff8000ffff2ee8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd805541f010,0,ffff80001e41e888,0,0,0) at sosend+0x669 sys/kern/uipc_socket.c:524 dofilewritev(ffff8000ffff2ee8,3,ffff80001e41e888,0,ffff80001e41e970) at dofilewritev+0x1ac sys/kern/sys_generic.c:364 sys_write(ffff8000ffff2ee8,ffff80001e41e928,ffff80001e41e970) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff80001e41e9f0) at syscall+0x507 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0xca4ff920db0, count: -18 ddb> show registers rdi 0xffffffff81dd27d7 db_enter+0x17 rsi 0x17a2 __ALIGN_SIZE+0x7a2 rbp 0xffff80001e41ddf0 rbx 0xffff80001e41dea0 rdx 0x17a3 __ALIGN_SIZE+0x7a3 rcx 0xffff80001d419000 rax 0xffff80001d419000 r8 0xffff80001e41ddb0 r9 0x1 r10 0xffff8000009f0840 r11 0x6d6b6849a9b6df7e r12 0x3000000008 r13 0xffff80001e41de00 r14 0x100 r15 0x1 rip 0xffffffff81dd27d8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001e41dde0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=274304 stat=onproc flags process=0 proc=4000000 pri=73, usrpri=73, nice=20 forw=0xffffffffffffffff, list=0xffff8000ffff33d8,0xffffffff82549f00 process=0xffff8000ffff66e0 user=0xffff80001e419000, vmspace=0xfffffd806bc0a220 estcpu=23, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 85123 391095 13371 0 2 0 syz-executor.0 *85123 274304 13371 0 7 0x4000000 syz-executor.0 31870 390022 0 0 3 0x14200 acct acct 81055 180658 0 0 3 0x14200 bored sosplice 15950 67549 14940 0 3 0x82 nanosleep syz-executor.1 13371 478280 14940 0 3 0x82 nanosleep syz-executor.0 14940 26992 44875 0 3 0x82 thrsleep syz-fuzzer 14940 375424 44875 0 3 0x4000082 thrsleep syz-fuzzer 14940 368961 44875 0 3 0x4000082 kqread syz-fuzzer 14940 437045 44875 0 3 0x4000082 thrsleep syz-fuzzer 14940 238395 44875 0 3 0x4000082 thrsleep syz-fuzzer 14940 440983 44875 0 3 0x4000082 thrsleep syz-fuzzer 14940 100108 44875 0 3 0x4000082 thrsleep syz-fuzzer 44875 432836 32821 0 3 0x10008a pause ksh 32821 7152 6015 0 3 0x92 select sshd 90010 219369 1 0 3 0x100083 ttyin getty 6015 272787 1 0 3 0x80 select sshd 38322 415307 1644 73 3 0x100090 kqread syslogd 1644 114336 1 0 3 0x100082 netio syslogd 44202 301417 1 77 3 0x100090 poll dhclient 47471 490505 1 0 3 0x80 poll dhclient 59950 295524 0 0 2 0x14200 zerothread 27856 212290 0 0 3 0x14200 aiodoned aiodoned 75227 150631 0 0 3 0x14200 syncer update 98289 41443 0 0 3 0x14200 cleaner cleaner 46091 180231 0 0 3 0x14200 reaper reaper 60706 148202 0 0 3 0x14200 pgdaemon pagedaemon 70486 28315 0 0 3 0x14200 bored crynlk 85195 261450 0 0 3 0x14200 bored crypto 86049 7863 0 0 3 0x40014200 acpi0 acpi0 96069 214963 0 0 3 0x14200 bored softnet 32130 175847 0 0 3 0x14200 bored systqmp 2698 183503 0 0 3 0x14200 bored systq 45898 338224 0 0 3 0x40014200 bored softclock 54424 294835 0 0 3 0x40014200 idle0 45435 90053 0 0 3 0x14200 bored smr 1 186029 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 9497 6341K 7621K 78643K 11860 0 pcb 15 8K 8K 78643K 67 0 rtable 107 4K 4K 78643K 285 0 ifaddr 67 13K 15K 78643K 113 0 counters 19 16K 16K 78643K 19 0 ioctlops 0 0K 2K 78643K 33 0 iov 0 0K 16K 78643K 66 0 mount 1 1K 1K 78643K 1 0 vnodes 1225 77K 77K 78643K 1540 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 5 0 VM map 2 0K 0K 78643K 2 0 sem 12 0K 0K 78643K 68 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1794 195K 288K 78643K 12646 0 file desc 5 13K 25K 78643K 240 0 sigio 0 0K 0K 78643K 23 0 proc 48 38K 63K 78643K 382 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 21 0 in_multi 42 2K 2K 78643K 57 0 ether_multi 1 0K 0K 78643K 3 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 67 307K 307K 78643K 67 0 exec 0 0K 1K 78643K 211 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 111 21K 23K 78643K 1479 0 UVM aobj 18 2K 2K 78643K 18 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 1K 78643K 68 0 NDP 11 0K 0K 78643K 24 0 temp 129 3014K 3082K 78643K 4066 0 kqueue 0 0K 0K 78643K 8 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 6 0 0 1 0 1 1 0 8 0 rtpcb 80 43 0 41 1 0 1 1 0 8 0 rtentry 112 49 0 7 2 0 2 2 0 8 0 unpcb 120 216 0 204 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 11 0 11 1 1 0 1 0 8 0 tcpcb 544 101 0 97 1 0 1 1 0 8 0 inpcb 280 283 0 274 3 1 2 2 0 8 1 nd6 48 5 0 2 1 0 1 1 0 8 0 ppxss 1128 6 0 6 2 1 1 1 0 8 1 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 0 art_table 32 237 0 39 2 0 2 2 0 8 0 art_node 16 48 0 9 1 0 1 1 0 8 0 sysvmsgpl 40 89 0 78 1 0 1 1 0 8 0 semupl 112 1 0 1 1 1 0 1 0 8 0 semapl 112 66 0 56 1 0 1 1 0 8 0 shmpl 112 16 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1802 0 398 46 0 46 46 0 8 0 ffsino 240 1802 0 398 83 0 83 83 0 8 0 nchpl 144 2394 0 780 61 0 61 61 0 8 1 uvmvnodes 72 2123 0 0 39 0 39 39 0 8 0 vnodes 208 2123 0 0 112 0 112 112 0 8 0 namei 1024 6717 0 6717 1 0 1 1 0 8 1 vmpool 528 4 0 4 1 0 1 1 0 8 1 scxspl 192 7066 0 7066 1 0 1 1 0 8 1 plimitpl 152 37 0 30 1 0 1 1 0 8 0 sigapl 432 411 0 398 2 0 2 2 0 8 0 futexpl 56 7493 0 7493 1 0 1 1 0 8 1 knotepl 112 93 0 74 1 0 1 1 0 8 0 kqueuepl 104 66 0 64 1 0 1 1 0 8 0 pipepl 112 322 0 303 2 1 1 2 0 8 0 fdescpl 424 412 0 398 2 0 2 2 0 8 0 filepl 120 3175 0 3071 5 1 4 5 0 8 0 lockfpl 104 252 0 250 1 0 1 1 0 8 0 lockfspl 48 82 0 80 1 0 1 1 0 8 0 sessionpl 112 17 0 7 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 310 0 302 1 0 1 1 0 8 0 zombiepl 144 398 0 397 1 0 1 1 0 8 0 processpl 872 428 0 397 4 0 4 4 0 8 0 procpl 632 767 0 729 4 0 4 4 0 8 0 sosppl 128 10 0 10 1 0 1 1 0 8 1 sockpl 384 548 0 525 4 0 4 4 0 8 1 mcl64k 65536 40 0 40 1 0 1 1 0 8 1 mcl16k 16384 8 0 8 1 0 1 1 0 8 1 mcl12k 12288 5 0 5 1 0 1 1 0 8 1 mcl9k 9216 5 0 5 1 0 1 1 0 8 1 mcl8k 8192 8 0 8 1 0 1 1 0 8 1 mcl4k 4096 34 0 34 2 1 1 1 0 8 1 mcl2k2 2112 3 0 3 1 0 1 1 0 8 1 mcl2k 2048 67785 0 67735 19 11 8 15 0 8 1 mtagpl 80 17 0 2 2 1 1 1 0 8 0 mbufpl 256 108865 0 108727 16 4 12 12 0 8 1 bufpl 280 8008 0 1824 442 0 442 442 0 8 0 anonpl 16 71779 0 52581 99 5 94 94 0 107 15 amapchunkpl 152 2531 0 2379 21 5 16 16 0 158 8 amappl16 192 2654 0 1603 68 7 61 65 0 8 8 amappl15 184 50 0 46 1 0 1 1 0 8 0 amappl14 176 26 0 24 1 0 1 1 0 8 0 amappl13 168 1 0 0 1 0 1 1 0 8 0 amappl12 160 7 0 6 2 1 1 1 0 8 0 amappl11 152 165 0 152 1 0 1 1 0 8 0 amappl10 144 20 0 16 1 0 1 1 0 8 0 amappl9 136 558 0 555 1 0 1 1 0 8 0 amappl8 128 120 0 94 1 0 1 1 0 8 0 amappl7 120 92 0 80 1 0 1 1 0 8 0 amappl6 112 180 0 170 1 0 1 1 0 8 0 amappl5 104 157 0 147 1 0 1 1 0 8 0 amappl4 96 641 0 609 1 0 1 1 0 8 0 amappl3 88 128 0 121 1 0 1 1 0 8 0 amappl2 80 2520 0 2449 3 1 2 3 0 8 0 amappl1 72 17230 0 16808 25 16 9 20 0 8 0 amappl 80 996 0 953 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 17 0 0 1 0 1 1 0 8 0 uaddrrnd 24 416 0 402 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 416 0 402 1 0 1 1 0 8 0 vmmpekpl 168 7161 0 7135 2 0 2 2 0 8 0 vmmpepl 168 57599 0 55442 135 15 120 131 0 357 21 vmsppl 272 415 0 402 2 1 1 2 0 8 0 pdppl 4096 838 0 804 6 1 5 6 0 8 0 pvpl 32 258844 0 236595 318 5 313 313 0 265 132 pmappl 200 415 0 402 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 153 0 20 5 0 5 5 0 8 0