panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *398122 86923 0 0 0x4000000 1 syz-executor.0 192126 76604 0 0x14000 0x40000200 0 softclock 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(fffffd807d88a700,50,8,fffffd8062163620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd807d88a700,50,8,fffffd8062163620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd807d88a700,50,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd806f666578,fffffd807d88a700,ffff800021982720) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800021982968,ffff800021982974,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800021982968,ffff800021982974,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800021982968,ffff800021982974,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd807d88a700) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd807d88a700,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd807d885c00,ffff800000a93c80,fffffd806f666d90,0,0,fffffd806f666d20) at ip6_output+0xd26 rip6_output(fffffd8061c0a100,fffffd8065ec4990,ffff800021982cd0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8065ec4990,9,fffffd8061c0a100,0,0,ffff800020ac8ee8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8065ec4990,0,ffff800021982f28,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 end trace frame: 0xffff800021982f10, 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(fffffd807d88a700,50,8,fffffd8062163620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd807d88a700,50,8,fffffd8062163620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd807d88a700,50,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd806f666578,fffffd807d88a700,ffff800021982720) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800021982968,ffff800021982974,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800021982968,ffff800021982974,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800021982968,ffff800021982974,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd807d88a700) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd807d88a700,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd807d885c00,ffff800000a93c80,fffffd806f666d90,0,0,fffffd806f666d20) at ip6_output+0xd26 rip6_output(fffffd8061c0a100,fffffd8065ec4990,ffff800021982cd0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd8065ec4990,9,fffffd8061c0a100,0,0,ffff800020ac8ee8) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd8065ec4990,0,ffff800021982f28,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ac8ee8,3,ffff800021982f28,0,ffff800021983010) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ac8ee8,ffff800021982fc8,ffff800021983010) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800021983090) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800021983090) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x975da760c0, count: -18 ddb{1}> show registers rdi 0xffffffff821a0357 db_enter+0x17 rsi 0xf66 rbp 0xffff800021982490 rbx 0xffff800021982540 rdx 0xf67 rcx 0xffff80002198c000 rax 0xffff80002198c000 r8 0xffffffff8165bfff kprintf+0x16f r9 0x1 r10 0x25 r11 0xd69067dbc86c795a r12 0x3000000008 r13 0xffff8000219824a0 r14 0x100 r15 0x1 rip 0xffffffff821a0358 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800021982480 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=398122 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac8780,0xffffffff82631488 process=0xffff800020af4728 user=0xffff80002197e000, vmspace=0xfffffd806e790008 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 86923 11335 6351 0 2 0 syz-executor.0 *86923 398122 6351 0 7 0x4000000 syz-executor.0 81040 521265 0 0 3 0x14200 acct acct 6351 202259 50640 0 3 0x82 nanosleep syz-executor.0 96048 278952 1 0 3 0x100083 ttyin getty 81567 437412 0 0 3 0x14200 bored sosplice 80908 305784 50640 0 3 0x82 nanosleep syz-executor.1 50640 413575 17417 0 3 0x82 thrsleep syz-fuzzer 50640 454586 17417 0 2 0x4000482 syz-fuzzer 50640 176842 17417 0 3 0x4000082 thrsleep syz-fuzzer 50640 112007 17417 0 3 0x4000082 thrsleep syz-fuzzer 50640 106036 17417 0 3 0x4000082 thrsleep syz-fuzzer 50640 104628 17417 0 3 0x4000082 thrsleep syz-fuzzer 50640 175975 17417 0 3 0x4000082 thrsleep syz-fuzzer 50640 503569 17417 0 2 0x4000482 syz-fuzzer 50640 249627 17417 0 3 0x4000082 kqread syz-fuzzer 50640 515923 17417 0 3 0x4000082 thrsleep syz-fuzzer 50640 119538 17417 0 3 0x4000082 thrsleep syz-fuzzer 17417 372617 43462 0 3 0x10008a pause ksh 43462 110966 20551 0 3 0x92 select sshd 20551 303755 1 0 3 0x80 select sshd 53617 472761 24202 74 3 0x100092 bpf pflogd 24202 141499 1 0 3 0x80 netio pflogd 49007 374940 47588 73 3 0x100090 kqread syslogd 47588 242660 1 0 3 0x100082 netio syslogd 32208 205885 1 77 3 0x100090 poll dhclient 5446 442191 1 0 3 0x80 poll dhclient 33202 71749 0 0 3 0x14200 pgzero zerothread 80576 422204 0 0 3 0x14200 aiodoned aiodoned 67807 314161 0 0 3 0x14200 syncer update 993 315228 0 0 3 0x14200 cleaner cleaner 91406 455763 0 0 3 0x14200 reaper reaper 52895 265975 0 0 3 0x14200 pgdaemon pagedaemon 28786 205160 0 0 3 0x14200 bored crynlk 74 291673 0 0 3 0x14200 bored crypto 44681 246384 0 0 3 0x40014200 acpi0 acpi0 91609 424028 0 0 3 0x40014200 idle1 46068 155349 0 0 3 0x14200 bored softnet 13191 315981 0 0 3 0x14200 bored systqmp 99656 317986 0 0 3 0x14200 bored systq 76604 192126 0 0 7 0x40014200 softclock 32036 418934 0 0 3 0x40014200 idle0 29054 268049 0 0 3 0x14200 bored smr 1 448289 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 86923 (syz-executor.0) thread 0xffff800020ac8ee8 (398122) 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 9566 6934K 7524K 78643K 12264 0 pcb 15 10K 12K 78643K 90 0 rtable 101 5K 5K 78643K 355 0 ifaddr 75 15K 15K 78643K 123 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1491 0 iov 0 0K 16K 78643K 49 0 mount 1 1K 1K 78643K 1 0 vnodes 1224 77K 77K 78643K 1689 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 12 0K 1K 78643K 147 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 328 0 sigio 0 0K 0K 78643K 32 0 proc 60 63K 95K 78643K 517 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 1K 78643K 76 0 in_multi 51 2K 2K 78643K 113 0 ether_multi 1 0K 0K 78643K 10 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 73 334K 334K 78643K 73 0 exec 0 0K 1K 78643K 242 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 128 47K 47K 78643K 2084 0 UVM aobj 19 2K 2K 78643K 21 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 67 0 NDP 12 0K 0K 78643K 27 0 temp 135 3023K 3087K 78643K 15171 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 10 0 5 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 42 0 40 1 0 1 1 0 8 0 rtentry 112 69 0 30 2 0 2 2 0 8 0 unpcb 120 163 0 153 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 38 0 38 1 1 0 1 0 8 0 tcpcb 544 371 0 366 12 11 1 12 0 8 0 inpcb 280 924 0 915 10 8 2 9 0 8 1 nd6 48 8 0 6 1 0 1 1 0 8 0 pkpcb 40 6 0 6 1 1 0 1 0 8 0 ppxss 1128 5 0 5 2 1 1 1 0 8 1 pffrag 232 13 0 13 2 1 1 1 0 482 1 pffrnode 88 13 0 13 2 1 1 1 0 8 1 pffrent 40 421 0 421 2 1 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 59 0 30 1 0 1 1 0 8 0 pfstkey 112 59 0 30 3 1 2 2 0 8 0 pfstate 328 59 0 30 4 1 3 4 0 8 0 pfrule 1360 21 0 16 2 1 1 2 0 8 0 art_heap8 4096 2 0 0 2 0 2 2 0 8 0 art_heap4 256 339 0 127 15 1 14 14 0 8 0 art_table 32 341 0 127 2 0 2 2 0 8 0 art_node 16 68 0 31 1 0 1 1 0 8 0 sysvmsgpl 40 65 0 37 1 0 1 1 0 8 0 semupl 112 4 0 4 1 1 0 1 0 8 0 semapl 112 143 0 133 1 0 1 1 0 8 0 shmpl 112 19 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1889 0 480 46 0 46 46 0 8 0 ffsino 272 1889 0 480 95 0 95 95 0 8 0 nchpl 144 2558 0 947 61 0 61 61 0 8 0 uvmvnodes 72 2324 0 0 43 0 43 43 0 8 0 vnodes 208 2324 0 0 123 0 123 123 0 8 0 namei 1024 8165 0 8165 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 vcpupl 1984 2 0 0 1 0 1 1 0 8 0 vmpool 560 2 0 0 1 0 1 1 0 8 0 scsiplug 64 1 0 1 1 1 0 1 0 8 0 scxspl 192 7195 0 7195 9 8 1 7 0 8 1 plimitpl 152 39 0 31 1 0 1 1 0 8 0 sigapl 432 525 0 510 3 1 2 3 0 8 0 futexpl 56 8202 0 8202 2 1 1 1 0 8 1 knotepl 112 93 0 74 1 0 1 1 0 8 0 kqueuepl 104 192 0 190 4 3 1 4 0 8 0 pipepl 112 362 0 343 2 1 1 2 0 8 0 fdescpl 488 526 0 510 3 0 3 3 0 8 0 filepl 152 4355 0 4253 14 8 6 13 0 8 1 lockfpl 104 564 0 563 1 0 1 1 0 8 0 lockfspl 48 224 0 223 1 0 1 1 0 8 0 sessionpl 112 20 0 9 1 0 1 1 0 8 0 pgrppl 48 34 0 23 1 0 1 1 0 8 0 ucredpl 96 466 0 456 1 0 1 1 0 8 0 zombiepl 144 510 0 509 1 0 1 1 0 8 0 processpl 904 543 0 509 4 0 4 4 0 8 0 procpl 632 1252 0 1207 5 0 5 5 0 8 0 srpgc 64 4 0 4 1 1 0 1 0 8 0 sosppl 128 19 0 19 2 1 1 1 0 8 1 sockpl 384 1138 0 1117 19 15 4 14 0 8 1 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 3 0 0 1 0 1 1 0 8 0 mcl12k 12288 4 0 0 1 0 1 1 0 8 0 mcl9k 9216 6 0 0 1 0 1 1 0 8 0 mcl8k 8192 4 0 0 1 0 1 1 0 8 0 mcl4k 4096 7 0 0 1 0 1 1 0 8 0 mcl2k2 2112 1 0 0 1 0 1 1 0 8 0 mcl2k 2048 181 0 0 22 0 22 22 0 8 0 mtagpl 80 141 0 0 3 0 3 3 0 8 0 mbufpl 256 586 0 0 34 0 34 34 0 8 0 bufpl 280 6896 0 1342 397 0 397 397 0 8 0 anonpl 16 70031 0 50330 97 3 94 95 0 125 13 amapchunkpl 152 2993 0 2839 8 1 7 8 0 158 0 amappl16 192 2778 0 1690 66 5 61 66 0 8 6 amappl15 184 62 0 58 1 0 1 1 0 8 0 amappl14 176 34 0 33 1 0 1 1 0 8 0 amappl13 168 1 0 1 1 1 0 1 0 8 0 amappl12 160 129 0 125 2 1 1 1 0 8 0 amappl11 152 66 0 51 1 0 1 1 0 8 0 amappl10 144 42 0 36 1 0 1 1 0 8 0 amappl9 136 615 0 612 1 0 1 1 0 8 0 amappl8 128 132 0 105 1 0 1 1 0 8 0 amappl7 120 131 0 119 1 0 1 1 0 8 0 amappl6 112 67 0 59 1 0 1 1 0 8 0 amappl5 104 259 0 244 1 0 1 1 0 8 0 amappl4 96 794 0 761 2 1 1 2 0 8 0 amappl3 88 128 0 120 1 0 1 1 0 8 0 amappl2 80 3246 0 3171 3 1 2 3 0 8 0 amappl1 72 21822 0 21379 25 15 10 20 0 8 0 amappl 80 1516 0 1468 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 20 0 2 1 0 1 1 0 8 0 uaddrrnd 24 528 0 510 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 528 0 510 1 0 1 1 0 8 0 vmmpekpl 168 8192 0 8155 2 0 2 2 0 8 0 vmmpepl 168 72925 0 70653 143 34 109 135 0 357 6 vmsppl 368 527 0 510 2 0 2 2 0 8 0 pdppl 4096 1063 0 1022 6 0 6 6 0 8 0 pvpl 32 215495 0 192573 220 4 216 217 0 265 29 pmappl 232 527 0 510 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 205 0 16 6 0 6 6 0 8 0