login: panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 464536 49775 0 0 0 1 syz-executor.1 *444653 49775 0 0 0x4000000 0 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(fffffd806d793800,68,c8,fffffd806d32dd20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806d793800,68,c8,fffffd806d32dd20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806d793800,68,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd806f65e000,fffffd806d793800,ffff800023ba8840) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800023ba8a88,ffff800023ba8a94,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800023ba8a88,ffff800023ba8a94,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800023ba8a88,ffff800023ba8a94,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806d793800) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806d793800,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd806d53ce00,ffff800000a21f00,fffffd806f65ec78,0,0,fffffd806f65ec08) at ip6_output+0xd26 rip6_output(fffffd806f292b00,fffffd806206f7c0,ffff800023ba8df0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806206f7c0,9,fffffd806f292b00,0,0,ffff800020ad6780) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806206f7c0,0,ffff800023ba9048,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 end trace frame: 0xffff800023ba9030, 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{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic m_copydata: null mbuf ddb{0}> 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(fffffd806d793800,68,c8,fffffd806d32dd20) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806d793800,68,c8,fffffd806d32dd20) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806d793800,68,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd806f65e000,fffffd806d793800,ffff800023ba8840) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800023ba8a88,ffff800023ba8a94,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800023ba8a88,ffff800023ba8a94,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800023ba8a88,ffff800023ba8a94,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806d793800) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806d793800,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd806d53ce00,ffff800000a21f00,fffffd806f65ec78,0,0,fffffd806f65ec08) at ip6_output+0xd26 rip6_output(fffffd806f292b00,fffffd806206f7c0,ffff800023ba8df0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806206f7c0,9,fffffd806f292b00,0,0,ffff800020ad6780) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806206f7c0,0,ffff800023ba9048,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ad6780,3,ffff800023ba9048,0,ffff800023ba9130) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ad6780,ffff800023ba90e8,ffff800023ba9130) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800023ba91b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023ba91b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x9eed811fb10, count: -18 ddb{0}> show registers rdi 0xffffffff817710b7 db_enter+0x17 rsi 0xf52 rbp 0xffff800023ba85b0 rbx 0xffff800023ba8660 rdx 0xf53 rcx 0xffff800021b7c000 rax 0xffff800021b7c000 r8 0xffffffff81617f6f kprintf+0x16f r9 0x1 r10 0x25 r11 0xd8f95317a35450a r12 0x3000000008 r13 0xffff800023ba85c0 r14 0x100 r15 0x1 rip 0xffffffff817710b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023ba85a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=444653 stat=onproc flags process=0 proc=4000000 pri=74, usrpri=74, nice=20 forw=0xffffffffffffffff, list=0xffff800020ad7160,0xffffffff8261e778 process=0xffff800020af5548 user=0xffff800023ba4000, vmspace=0xfffffd807f000170 estcpu=36, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 49775 464536 27670 0 7 0 syz-executor.1 *49775 444653 27670 0 7 0x4000000 syz-executor.1 39752 53449 0 0 3 0x14200 bored sosplice 27670 136055 44029 0 3 0x82 nanosleep syz-executor.1 50260 78700 44029 0 2 0x2 syz-executor.0 44029 106629 83894 0 3 0x82 thrsleep syz-fuzzer 44029 272803 83894 0 3 0x4000082 nanosleep syz-fuzzer 44029 389562 83894 0 3 0x4000082 thrsleep syz-fuzzer 44029 276841 83894 0 3 0x4000082 thrsleep syz-fuzzer 44029 283129 83894 0 3 0x4000082 thrsleep syz-fuzzer 44029 305453 83894 0 3 0x4000082 thrsleep syz-fuzzer 44029 211795 83894 0 3 0x4000082 thrsleep syz-fuzzer 44029 231904 83894 0 3 0x4000082 nanosleep syz-fuzzer 44029 321358 83894 0 3 0x4000082 kqread syz-fuzzer 44029 95596 83894 0 3 0x4000082 thrsleep syz-fuzzer 83894 394577 17652 0 3 0x10008a pause ksh 17652 159758 55848 0 3 0x92 select sshd 99297 136036 1 0 3 0x100083 ttyin getty 55848 338192 1 0 3 0x80 select sshd 46634 496363 61767 74 3 0x100092 bpf pflogd 61767 332222 1 0 3 0x80 netio pflogd 7808 3219 75586 73 3 0x100090 kqread syslogd 75586 67006 1 0 3 0x100082 netio syslogd 88200 291341 1 77 3 0x100090 poll dhclient 90208 372412 1 0 3 0x80 poll dhclient 73791 306498 0 0 3 0x14200 pgzero zerothread 98196 333158 0 0 3 0x14200 aiodoned aiodoned 10282 40823 0 0 3 0x14200 syncer update 43299 298916 0 0 3 0x14200 cleaner cleaner 49242 174231 0 0 3 0x14200 reaper reaper 4174 7 0 0 3 0x14200 pgdaemon pagedaemon 61102 496486 0 0 3 0x14200 bored crynlk 72534 237509 0 0 3 0x14200 bored crypto 40827 158802 0 0 3 0x40014200 acpi0 acpi0 6174 110387 0 0 3 0x40014200 idle1 61597 303744 0 0 3 0x14200 bored softnet 4140 213890 0 0 3 0x14200 bored systqmp 80722 2846 0 0 3 0x14200 bored systq 99209 336274 0 0 3 0x40014200 bored softclock 37522 238994 0 0 3 0x40014200 idle0 55258 377553 0 0 3 0x14200 bored smr 1 49297 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 49775 (syz-executor.1) thread 0xffff800020ad6780 (444653) 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 Process 50260 (syz-executor.0) thread 0xffff800020ad6c70 (78700) exclusive rrwlock inode r = 0 (0xfffffd8065f74d60) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 vget+0x1c8 sys/kern/vfs_subr.c:672 #6 ufs_ihashget+0x141 sys/ufs/ufs/ufs_ihash.c:119 #7 ffs_vget+0x74 sys/ufs/ffs/ffs_vfsops.c:1323 #8 ufs_lookup+0x14b4 sys/ufs/ufs/ufs_lookup.c:487 #9 VOP_LOOKUP+0x5b sys/kern/vfs_vops.c:91 #10 vfs_lookup+0x7a6 sys/kern/vfs_lookup.c:568 #11 namei+0x63c sys/kern/vfs_lookup.c:249 #12 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1776 #13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #14 Xsyscall+0x128 exclusive rrwlock inode r = 0 (0xfffffd806accd6f8) #0 witness_lock+0x52e sys/kern/subr_witness.c:1163 #1 rw_enter+0x453 sys/kern/kern_rwlock.c:309 #2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453 #3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615 #4 vn_lock+0x81 sys/kern/vfs_vnops.c:571 #5 vfs_lookup+0xe6 sys/kern/vfs_lookup.c:419 #6 namei+0x63c sys/kern/vfs_lookup.c:249 #7 dounlinkat+0x99 sys/kern/vfs_syscalls.c:1776 #8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] #8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 #9 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9563 6747K 7053K 78643K 11221 0 pcb 15 8K 8K 78643K 131 0 rtable 95 4K 4K 78643K 320 0 ifaddr 89 16K 17K 78643K 117 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1473 0 iov 0 0K 16K 78643K 25 0 mount 1 1K 1K 78643K 1 0 vnodes 1222 77K 77K 78643K 1372 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 1K 1K 78643K 2 0 sem 12 0K 0K 78643K 25 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 5 13K 25K 78643K 130 0 proc 60 63K 95K 78643K 449 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 13 0 in_multi 59 2K 2K 78643K 88 0 ether_multi 1 0K 0K 78643K 2 0 mrt 0 0K 0K 78643K 5 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 212 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 116 38K 40K 78643K 1374 0 UVM aobj 5 2K 2K 78643K 13 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 91 0 NDP 16 0K 0K 78643K 27 0 temp 124 3018K 3082K 78643K 3866 0 SYN cache 2 16K 16K 78643K 2 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 7 0 3 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 33 0 31 1 0 1 1 0 8 0 rtentry 112 65 0 29 2 0 2 2 0 8 0 unpcb 120 97 0 87 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpcb 544 33 0 28 1 0 1 1 0 8 0 inpcb 280 362 0 353 6 0 6 6 0 8 5 rttmr 72 1 0 1 1 0 1 1 0 8 1 nd6 48 8 0 6 1 0 1 1 0 8 0 ppxss 1128 4 0 4 1 0 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 18 0 1 1 0 1 1 0 8 0 pfstkey 112 18 0 1 1 0 1 1 0 8 0 pfstate 328 18 0 1 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 256 370 0 168 17 1 16 16 0 8 1 art_table 32 371 0 168 2 0 2 2 0 8 0 art_node 16 64 0 30 1 0 1 1 0 8 0 sysvmsgpl 40 8 0 4 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 21 0 11 1 0 1 1 0 8 0 shmpl 112 11 0 8 2 1 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1589 0 183 46 0 46 46 0 8 0 ffsino 272 1589 0 183 95 0 95 95 0 8 0 nchpl 144 1939 0 320 61 0 61 61 0 8 0 uvmvnodes 72 1755 0 0 32 0 32 32 0 8 0 vnodes 208 1755 0 0 93 0 93 93 0 8 0 namei 1024 5245 0 5245 1 0 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 0 1 1 0 8 1 scxspl 192 5619 0 5619 8 2 6 7 0 8 6 plimitpl 152 17 0 9 1 0 1 1 0 8 0 sigapl 432 329 0 314 3 1 2 3 0 8 0 futexpl 56 2515 0 2515 1 0 1 1 0 8 1 knotepl 112 65 0 46 1 0 1 1 0 8 0 kqueuepl 104 42 0 40 1 0 1 1 0 8 0 pipepl 112 178 0 159 1 0 1 1 0 8 0 fdescpl 488 330 0 314 3 0 3 3 0 8 0 filepl 152 2156 0 2054 8 0 8 8 0 8 4 lockfpl 104 52 0 51 1 0 1 1 0 8 0 lockfspl 48 20 0 19 1 0 1 1 0 8 0 sessionpl 112 18 0 7 1 0 1 1 0 8 0 pgrppl 48 18 0 7 1 0 1 1 0 8 0 ucredpl 96 135 0 126 1 0 1 1 0 8 0 zombiepl 144 314 0 314 1 0 1 1 0 8 1 processpl 904 346 0 314 4 0 4 4 0 8 0 procpl 632 600 0 558 5 0 5 5 0 8 1 srpgc 64 2 0 2 1 1 0 1 0 8 0 sosppl 128 18 0 18 1 0 1 1 0 8 1 sockpl 384 492 0 471 10 0 10 10 0 8 7 mcl64k 65536 7 0 0 1 0 1 1 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 3 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 157 0 0 19 0 19 19 0 8 0 mtagpl 80 13 0 0 1 0 1 1 0 8 0 mbufpl 256 191 0 0 11 0 11 11 0 8 0 bufpl 280 6643 0 1340 379 0 379 379 0 8 0 anonpl 16 53373 0 33928 93 1 92 92 0 125 13 amapchunkpl 152 1878 0 1719 15 1 14 14 0 158 7 amappl16 192 1880 0 812 65 5 60 64 0 8 6 amappl15 184 58 0 54 1 0 1 1 0 8 0 amappl14 176 29 0 26 1 0 1 1 0 8 0 amappl13 168 2 0 2 2 2 0 1 0 8 0 amappl12 160 11 0 8 1 0 1 1 0 8 0 amappl11 152 102 0 85 1 0 1 1 0 8 0 amappl10 144 10 0 7 1 0 1 1 0 8 0 amappl9 136 601 0 598 1 0 1 1 0 8 0 amappl8 128 119 0 97 1 0 1 1 0 8 0 amappl7 120 101 0 90 1 0 1 1 0 8 0 amappl6 112 115 0 104 1 0 1 1 0 8 0 amappl5 104 135 0 120 1 0 1 1 0 8 0 amappl4 96 581 0 551 1 0 1 1 0 8 0 amappl3 88 121 0 113 1 0 1 1 0 8 0 amappl2 80 1729 0 1654 3 1 2 3 0 8 0 amappl1 72 17215 0 16763 26 16 10 21 0 8 0 amappl 80 850 0 803 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 12 0 8 1 0 1 1 0 8 0 uaddrrnd 24 332 0 314 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 332 0 314 1 0 1 1 0 8 0 vmmpekpl 168 6512 0 6479 2 0 2 2 0 8 0 vmmpepl 168 48802 0 46559 140 10 130 133 0 357 28 vmsppl 368 331 0 314 2 0 2 2 0 8 0 pdppl 4096 671 0 630 6 0 6 6 0 8 0 pvpl 32 166507 0 143897 215 0 215 215 0 265 31 pmappl 232 331 0 314 2 0 2 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 168 0 4 5 0 5 5 0 8 0