panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 247823 40475 0 0 0 1 syz-executor.1 * 89835 40475 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(fffffd806f10d900,3d0,8,fffffd806d277620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806f10d900,3d0,8,fffffd806d277620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806f10d900,3d0,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd806f661578,fffffd806f10d900,ffff800023ba4740) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800023ba4988,ffff800023ba4994,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800023ba4988,ffff800023ba4994,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800023ba4988,ffff800023ba4994,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806f10d900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806f10d900,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd80659ecd00,ffff800000a1e580,fffffd806f661b60,0,0,fffffd806f661af0) at ip6_output+0xd26 rip6_output(fffffd80659ecd00,fffffd806f662600,ffff800023ba4cf0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806f662600,9,fffffd80659ecd00,0,0,ffff800020ac9b40) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806f662600,0,ffff800023ba4f48,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 end trace frame: 0xffff800023ba4f30, 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(fffffd806f10d900,3d0,8,fffffd806d277620) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806f10d900,3d0,8,fffffd806d277620) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806f10d900,3d0,0) at ip6_pullexthdr+0x16f sys/netinet6/ip6_input.c:1175 ip6_savecontrol(fffffd806f661578,fffffd806f10d900,ffff800023ba4740) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1062 rip6_input(ffff800023ba4988,ffff800023ba4994,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800023ba4988,ffff800023ba4994,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800023ba4988,ffff800023ba4994,29,0,ffff800000679800) at ip6_input_if+0x1207 ipv6_input(ffff800000679800,fffffd806f10d900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806f10d900,18) at if_input_local+0x121 sys/net/if.c:781 ip6_output(fffffd80659ecd00,ffff800000a1e580,fffffd806f661b60,0,0,fffffd806f661af0) at ip6_output+0xd26 rip6_output(fffffd80659ecd00,fffffd806f662600,ffff800023ba4cf0,0) at rip6_output+0x4c0 sys/netinet6/raw_ip6.c:481 rip6_usrreq(fffffd806f662600,9,fffffd80659ecd00,0,0,ffff800020ac9b40) at rip6_usrreq+0x5e1 sys/netinet6/raw_ip6.c:670 sosend(fffffd806f662600,0,ffff800023ba4f48,0,0,0) at sosend+0x671 sys/kern/uipc_socket.c:524 dofilewritev(ffff800020ac9b40,3,ffff800023ba4f48,0,ffff800023ba5030) at dofilewritev+0x1b7 sys/kern/sys_generic.c:364 sys_write(ffff800020ac9b40,ffff800023ba4fe8,ffff800023ba5030) at sys_write+0x83 sys/kern/sys_generic.c:284 syscall(ffff800023ba50b0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline] syscall(ffff800023ba50b0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x8ad02d888a0, count: -18 ddb{0}> show registers rdi 0xffffffff817710b7 db_enter+0x17 rsi 0x2d57 __ALIGN_SIZE+0x1d57 rbp 0xffff800023ba44b0 rbx 0xffff800023ba4560 rdx 0x2d58 __ALIGN_SIZE+0x1d58 rcx 0xffff800021b94000 rax 0xffff800021b94000 r8 0xffffffff81617f6f kprintf+0x16f r9 0x1 r10 0x25 r11 0xa1ccdcd8d3e8ab1c r12 0x3000000008 r13 0xffff800023ba44c0 r14 0x100 r15 0x1 rip 0xffffffff817710b8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800023ba44a0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor.1) pid=89835 stat=onproc flags process=0 proc=4000000 pri=86, usrpri=86, nice=20 forw=0xffffffffffffffff, list=0xffff800020ac9160,0xffffffff8261e778 process=0xffff800020af4e38 user=0xffff800023ba0000, vmspace=0xfffffd807f000450 estcpu=36, cpticks=1, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 40475 247823 54364 0 7 0 syz-executor.1 *40475 89835 54364 0 7 0x4000000 syz-executor.1 79162 244864 19881 0 3 0x80 nanosleep syz-executor.0 79162 31393 19881 0 3 0x4000080 msgwait syz-executor.0 79162 103718 19881 0 3 0x4000080 fsleep syz-executor.0 64183 282999 0 0 3 0x14200 bored sosplice 54364 249842 65420 0 3 0x82 nanosleep syz-executor.1 19881 14441 65420 0 3 0x82 nanosleep syz-executor.0 65420 337389 77841 0 3 0x82 thrsleep syz-fuzzer 65420 233671 77841 0 3 0x4000082 nanosleep syz-fuzzer 65420 269279 77841 0 3 0x4000082 thrsleep syz-fuzzer 65420 305643 77841 0 3 0x4000082 nanosleep syz-fuzzer 65420 216315 77841 0 3 0x4000082 kqread syz-fuzzer 65420 6497 77841 0 3 0x4000082 thrsleep syz-fuzzer 65420 170228 77841 0 3 0x4000082 thrsleep syz-fuzzer 65420 52697 77841 0 3 0x4000082 thrsleep syz-fuzzer 65420 347509 77841 0 3 0x4000082 thrsleep syz-fuzzer 65420 59869 77841 0 3 0x4000082 thrsleep syz-fuzzer 77841 29464 70634 0 3 0x10008a pause ksh 70634 167229 43751 0 3 0x92 select sshd 34385 484281 1 0 3 0x100083 ttyin getty 43751 117028 1 0 3 0x80 select sshd 34241 140509 73836 74 3 0x100092 bpf pflogd 73836 125280 1 0 3 0x80 netio pflogd 97573 285991 42152 73 3 0x100090 kqread syslogd 42152 264381 1 0 3 0x100082 netio syslogd 70085 478925 0 0 3 0x14200 pgzero zerothread 82918 26734 0 0 3 0x14200 aiodoned aiodoned 55144 361427 0 0 3 0x14200 syncer update 64865 473950 0 0 3 0x14200 cleaner cleaner 72448 290051 0 0 3 0x14200 reaper reaper 89055 62993 0 0 3 0x14200 pgdaemon pagedaemon 19653 137646 0 0 3 0x14200 bored crynlk 66544 419095 0 0 3 0x14200 bored crypto 50042 333243 0 0 3 0x40014200 acpi0 acpi0 10066 294030 0 0 3 0x40014200 idle1 35295 97653 0 0 3 0x14200 bored softnet 53138 437392 0 0 3 0x14200 bored systqmp 6107 5543 0 0 3 0x14200 bored systq 34462 469016 0 0 3 0x40014200 bored softclock 35316 71884 0 0 3 0x40014200 idle0 19112 130419 0 0 3 0x14200 bored smr 1 181682 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 40475 (syz-executor.1) thread 0xffff800020ac9b40 (89835) 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 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9532 6484K 6799K 78643K 10878 0 pcb 16 8K 8K 78643K 150 0 rtable 106 3K 4K 78643K 227 0 ifaddr 73 13K 14K 78643K 93 0 counters 39 33K 33K 78643K 39 0 ioctlops 0 0K 4K 78643K 1477 0 iov 0 0K 12K 78643K 78 0 mount 1 1K 1K 78643K 1 0 vnodes 1220 77K 77K 78643K 1311 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 4 0 VM map 2 1K 1K 78643K 2 0 sem 11 1K 1K 78643K 11 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 123 0 proc 54 50K 83K 78643K 442 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 3 0 in_multi 33 2K 2K 78643K 45 0 ether_multi 1 0K 0K 78643K 1 0 mrt 0 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 215 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 113 22K 23K 78643K 1395 0 UVM aobj 35 2K 2K 78643K 35 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 16 0 NDP 13 0K 0K 78643K 21 0 temp 125 3019K 3089K 78643K 5169 0 kqueue 0 0K 0K 78643K 2 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 6 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 27 0 27 1 0 1 1 0 8 1 rtentry 112 51 0 8 2 0 2 2 0 8 0 unpcb 120 100 0 92 1 0 1 1 0 8 0 syncache 264 6 0 6 2 1 1 1 0 8 1 tcpqe 32 514 0 514 1 1 0 1 0 8 0 tcpcb 544 125 0 121 2 0 2 2 0 8 1 inpcb 280 439 0 431 5 0 5 5 0 8 4 rttmr 72 1 0 1 1 0 1 1 0 8 1 nd6 48 5 0 2 1 0 1 1 0 8 0 ppxss 1128 3 0 3 1 0 1 1 0 8 1 pffrag 232 5 0 5 1 0 1 1 0 482 1 pffrnode 88 5 0 5 1 0 1 1 0 8 1 pffrent 40 182 0 182 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 22 0 3 1 0 1 1 0 8 0 pfstkey 112 22 0 3 1 0 1 1 0 8 0 pfstate 328 22 0 3 2 0 2 2 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 256 242 0 39 14 0 14 14 0 8 0 art_table 32 244 0 39 2 0 2 2 0 8 0 art_node 16 50 0 10 1 0 1 1 0 8 0 sysvmsgpl 40 11 0 3 1 0 1 1 0 8 0 semupl 112 2 0 2 1 0 1 1 0 8 1 semapl 112 9 0 0 1 0 1 1 0 8 0 shmpl 112 33 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1601 0 189 46 0 46 46 0 8 0 ffsino 272 1601 0 189 95 0 95 95 0 8 0 nchpl 144 1969 0 349 61 0 61 61 0 8 0 uvmvnodes 72 1704 0 0 31 0 31 31 0 8 0 vnodes 208 1704 0 0 90 0 90 90 0 8 0 namei 1024 5340 0 5340 1 0 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 5677 0 5677 8 4 4 7 0 8 4 plimitpl 152 22 0 14 1 0 1 1 0 8 0 sigapl 432 322 0 308 3 1 2 3 0 8 0 futexpl 56 2927 0 2926 1 0 1 1 0 8 0 knotepl 112 87 0 68 1 0 1 1 0 8 0 kqueuepl 104 82 0 80 1 0 1 1 0 8 0 pipepl 112 172 0 153 1 0 1 1 0 8 0 fdescpl 488 323 0 308 3 0 3 3 0 8 0 filepl 152 2315 0 2220 6 0 6 6 0 8 2 lockfpl 104 50 0 50 1 0 1 1 0 8 1 lockfspl 48 17 0 17 1 0 1 1 0 8 1 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 96 183 0 175 1 0 1 1 0 8 0 zombiepl 144 308 0 308 1 0 1 1 0 8 1 processpl 904 339 0 308 4 0 4 4 0 8 0 procpl 632 613 0 570 5 0 5 5 0 8 1 srpgc 64 2 0 2 1 0 1 1 0 8 1 sosppl 128 15 0 15 1 0 1 1 0 8 1 sockpl 384 566 0 550 8 0 8 8 0 8 6 mcl64k 65536 9 0 0 2 0 2 2 0 8 0 mcl16k 16384 1 0 0 1 0 1 1 0 8 0 mcl12k 12288 2 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 2 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 187 0 0 23 0 23 23 0 8 0 mtagpl 80 6 0 0 1 0 1 1 0 8 0 mbufpl 256 296 0 0 18 0 18 18 0 8 0 bufpl 280 6645 0 1340 379 0 379 379 0 8 0 anonpl 16 47838 0 29036 77 1 76 76 0 125 0 amapchunkpl 152 1786 0 1636 13 0 13 13 0 158 5 amappl16 192 1498 0 458 52 0 52 52 0 8 0 amappl15 184 59 0 56 1 0 1 1 0 8 0 amappl14 176 72 0 67 1 0 1 1 0 8 0 amappl12 160 4 0 4 1 1 0 1 0 8 0 amappl11 152 106 0 95 1 0 1 1 0 8 0 amappl10 144 14 0 8 1 0 1 1 0 8 0 amappl9 136 601 0 598 1 0 1 1 0 8 0 amappl8 128 135 0 111 1 0 1 1 0 8 0 amappl7 120 104 0 92 1 0 1 1 0 8 0 amappl6 112 110 0 100 1 0 1 1 0 8 0 amappl5 104 134 0 122 1 0 1 1 0 8 0 amappl4 96 584 0 552 1 0 1 1 0 8 0 amappl3 88 156 0 148 1 0 1 1 0 8 0 amappl2 80 1665 0 1591 3 1 2 3 0 8 0 amappl1 72 17190 0 16746 27 17 10 21 0 8 0 amappl 80 871 0 827 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 34 0 0 1 0 1 1 0 8 0 uaddrrnd 24 323 0 308 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 323 0 308 1 0 1 1 0 8 0 vmmpekpl 168 6469 0 6433 2 0 2 2 0 8 0 vmmpepl 168 47238 0 44983 142 11 131 134 0 357 32 vmsppl 368 322 0 308 2 0 2 2 0 8 0 pdppl 4096 653 0 616 6 1 5 6 0 8 0 pvpl 32 162312 0 140333 181 0 181 181 0 265 3 pmappl 232 322 0 308 2 1 1 2 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 179 0 4 6 0 6 6 0 8 0