panic: m_copydata: null mbuf Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 429787 10042 0 0x2 0x480 1 syz-executor.0 *236428 28560 0 0x14000 0x200 0 softnet db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398 panic(ffffffff8226b85f) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806f203900,30,2,ffff800020a38e18) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806f203900,30,2,ffff800020a38e18) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806f203900,30,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1146 ip6_savecontrol(fffffd806f6f3000,fffffd806f203900,ffff800020a38f80) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff800020a391c8,ffff800020a391d4,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800020a391c8,ffff800020a391d4,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800020a391c8,ffff800020a391d4,29,0,ffff800000679800) at ip6_input_if+0x17e1 ip6_ours sys/netinet6/ip6_input.c:538 [inline] ip6_input_if(ffff800020a391c8,ffff800020a391d4,29,0,ffff800000679800) at ip6_input_if+0x17e1 sys/netinet6/ip6_input.c:471 ipv6_input(ffff800000679800,fffffd806f203900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806f203900,18) at if_input_local+0x121 sys/net/if.c:780 loinput(ffff800000679800,fffffd806f203900,0) at loinput+0x4f sys/net/if_loop.c:239 if_input_process(ffff800000679800,ffff800020a39338) at if_input_process+0xfb if_ih_input sys/net/if.c:909 [inline] if_input_process(ffff800000679800,ffff800020a39338) at if_input_process+0xfb sys/net/if.c:943 ifiq_process(ffff800000679bf8) at ifiq_process+0x80 sys/net/ifq.c:646 taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: 1 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(ffffffff8226b85f) at panic+0x15c sys/kern/subr_prf.c:207 m_copydata(fffffd806f203900,30,2,ffff800020a38e18) at m_copydata+0x17e m_getptr sys/kern/uipc_mbuf.c:1031 [inline] m_copydata(fffffd806f203900,30,2,ffff800020a38e18) at m_copydata+0x17e sys/kern/uipc_mbuf.c:722 ip6_pullexthdr(fffffd806f203900,30,0) at ip6_pullexthdr+0xa2 sys/netinet6/ip6_input.c:1146 ip6_savecontrol(fffffd806f6f3000,fffffd806f203900,ffff800020a38f80) at ip6_savecontrol+0x373 sys/netinet6/ip6_input.c:1056 rip6_input(ffff800020a391c8,ffff800020a391d4,0,18) at rip6_input+0x7e7 sys/netinet6/raw_ip6.c:225 ip_deliver(ffff800020a391c8,ffff800020a391d4,0,18) at ip_deliver+0x353 sys/netinet/ip_input.c:668 ip6_input_if(ffff800020a391c8,ffff800020a391d4,29,0,ffff800000679800) at ip6_input_if+0x17e1 ip6_ours sys/netinet6/ip6_input.c:538 [inline] ip6_input_if(ffff800020a391c8,ffff800020a391d4,29,0,ffff800000679800) at ip6_input_if+0x17e1 sys/netinet6/ip6_input.c:471 ipv6_input(ffff800000679800,fffffd806f203900) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171 if_input_local(ffff800000679800,fffffd806f203900,18) at if_input_local+0x121 sys/net/if.c:780 loinput(ffff800000679800,fffffd806f203900,0) at loinput+0x4f sys/net/if_loop.c:239 if_input_process(ffff800000679800,ffff800020a39338) at if_input_process+0xfb if_ih_input sys/net/if.c:909 [inline] if_input_process(ffff800000679800,ffff800020a39338) at if_input_process+0xfb sys/net/if.c:943 ifiq_process(ffff800000679bf8) at ifiq_process+0x80 sys/net/ifq.c:646 taskq_thread(ffff80000002b080) at taskq_thread+0x9c sys/kern/kern_task.c:369 end trace frame: 0x0, count: -14 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a38cf0 rbx 0xffff800020a38da0 rdx 0xffff800020a189c0 rcx 0 rax 0 r8 0xffffffff81ce63bf kprintf+0x16f r9 0x1 r10 0x25 r11 0xe556b918f60c5929 r12 0x3000000008 r13 0xffff800020a38d00 r14 0x100 r15 0x1 rip 0xffffffff815a95a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a38ce0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softnet) pid=236428 stat=onproc flags process=14000 proc=200 pri=32, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020a18c30,0xffff800020a184f0 process=0xffff800020a1a3c0 user=0xffff800020a34000, vmspace=0xffffffff82635118 estcpu=0, cpticks=1, pctcpu=1.23 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 79328 453585 36594 0 2 0 syz-executor.1 79328 331803 36594 0 2 0x4000000 syz-executor.1 87809 195823 10042 0 3 0x80 nanosleep syz-executor.0 87809 90693 10042 0 3 0x4000080 semwait syz-executor.0 87809 461325 10042 0 3 0x4000080 fsleep syz-executor.0 10042 429787 61789 0 7 0x482 syz-executor.0 36594 261241 61789 0 2 0x482 syz-executor.1 61789 388585 23866 0 3 0x82 thrsleep syz-fuzzer 61789 216579 23866 0 2 0x4000482 syz-fuzzer 61789 184670 23866 0 3 0x4000082 kqread syz-fuzzer 61789 289406 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 338030 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 404527 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 364445 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 156963 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 312175 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 290586 23866 0 3 0x4000082 thrsleep syz-fuzzer 61789 21396 23866 0 3 0x4000082 thrsleep syz-fuzzer 23866 116970 76384 0 3 0x10008a pause ksh 76384 312515 28151 0 3 0x92 select sshd 96821 394251 1 0 3 0x100083 ttyin getty 28151 38154 1 0 3 0x80 select sshd 27011 304351 29115 74 3 0x100092 bpf pflogd 29115 422592 1 0 3 0x80 netio pflogd 79149 520174 26833 73 3 0x100090 kqread syslogd 26833 96343 1 0 3 0x100082 netio syslogd 54341 147175 1 77 3 0x100090 poll dhclient 2912 24440 1 0 3 0x80 poll dhclient 6206 445057 0 0 2 0x40014200 smr 68916 109825 0 0 3 0x14200 pgzero zerothread 37 183500 0 0 3 0x14200 aiodoned aiodoned 70014 57594 0 0 3 0x14200 syncer update 63748 149477 0 0 3 0x14200 cleaner cleaner 7035 388212 0 0 3 0x14200 reaper reaper 68407 232052 0 0 3 0x14200 pgdaemon pagedaemon 91774 387864 0 0 3 0x14200 bored crynlk 71885 193560 0 0 3 0x14200 bored crypto 6240 507099 0 0 3 0x40014200 acpi0 acpi0 37176 442438 0 0 3 0x40014200 idle1 *28560 236428 0 0 7 0x14200 softnet 94329 222693 0 0 3 0x14200 bored systqmp 83036 475656 0 0 3 0x14200 bored systq 24322 462302 0 0 3 0x40014200 bored softclock 44376 43896 0 0 3 0x40014200 idle0 1 134276 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 28560 (softnet) thread 0xffff800020a189c0 (236428) shared rwlock netlock r = 0 (0xffffffff8248d648) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 if_input_process+0x84 sys/net/if.c:941 #2 ifiq_process+0x80 sys/net/ifq.c:646 #3 taskq_thread+0x9c sys/kern/kern_task.c:369 #4 proc_trampoline+0x1c shared rwlock softnet r = 0 (0xffff80000002b0e0) #0 witness_lock+0x52e sys/kern/subr_witness.c:1164 #1 taskq_thread+0x8f sys/kern/kern_task.c:368 #2 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9527 6983K 6983K 78643K 10730 0 pcb 17 8K 8K 78643K 38 0 rtable 97 3K 3K 78643K 203 0 ifaddr 49 11K 11K 78643K 51 0 counters 43 33K 33K 78643K 43 0 ioctlops 0 0K 4K 78643K 1469 0 iov 0 0K 2K 78643K 6 0 mount 1 1K 1K 78643K 1 0 vnodes 1228 77K 77K 78643K 1269 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 5 0K 0K 78643K 5 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 6 17K 25K 78643K 68 0 proc 60 63K 95K 78643K 444 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 1 0K 0K 78643K 4 0 in_multi 38 2K 2K 78643K 45 0 ether_multi 2 0K 0K 78643K 5 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 43 201K 201K 78643K 43 0 exec 0 0K 1K 78643K 207 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 117 22K 22K 78643K 1133 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 2 0K 0K 78643K 15 0 NDP 7 0K 0K 78643K 11 0 temp 74 3016K 3080K 78643K 2183 0 kqueue 3 4K 8K 78643K 7 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 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 19 0 17 1 0 1 1 0 8 0 rtentry 112 45 0 5 2 0 2 2 0 8 0 unpcb 120 43 0 33 1 0 1 1 0 8 0 syncache 264 4 0 4 1 1 0 1 0 8 0 tcpqe 32 145 0 145 1 0 1 1 0 8 1 tcpcb 544 34 0 29 1 0 1 1 0 8 0 inpcb 280 94 0 82 2 0 2 2 0 8 1 nd6 48 6 0 0 1 0 1 1 0 8 0 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 16 0 0 1 0 1 1 0 8 0 pfstkey 112 16 0 0 1 0 1 1 0 8 0 pfstate 328 16 0 0 2 0 2 2 0 8 0 pfrule 1360 21 0 15 2 0 2 2 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 188 0 4 12 0 12 12 0 8 0 art_table 32 189 0 4 2 0 2 2 0 8 0 art_node 16 44 0 8 1 0 1 1 0 8 0 sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0 semapl 112 3 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1490 0 79 46 0 46 46 0 8 0 ffsino 272 1490 0 79 95 0 95 95 0 8 0 nchpl 144 1772 0 154 61 0 61 61 0 8 0 uvmvnodes 72 1566 0 0 29 0 29 29 0 8 0 vnodes 208 1566 0 0 83 0 83 83 0 8 0 namei 1024 4667 0 4667 1 0 1 1 0 8 1 percpumem 16 32 0 0 1 0 1 1 0 8 0 scxspl 192 5505 0 5505 4 1 3 3 0 8 3 plimitpl 152 15 0 7 1 0 1 1 0 8 0 sigapl 424 283 0 251 4 0 4 4 0 8 0 futexpl 56 780 0 779 1 0 1 1 0 8 0 knotepl 112 56 0 37 1 0 1 1 0 8 0 kqueuepl 144 14 0 12 1 0 1 1 0 8 0 pipelkpl 48 77 0 67 1 0 1 1 0 8 0 pipepl 120 154 0 135 1 0 1 1 0 8 0 fdescpl 496 268 0 251 3 0 3 3 0 8 0 filepl 152 1478 0 1372 5 0 5 5 0 8 0 lockfpl 104 11 0 10 1 0 1 1 0 8 0 lockfspl 48 6 0 5 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 96 125 0 116 1 0 1 1 0 8 0 zombiepl 144 251 0 251 1 0 1 1 0 8 1 processpl 960 283 0 251 5 0 5 5 0 8 0 procpl 624 368 0 323 4 0 4 4 0 8 0 sockpl 400 156 0 132 3 0 3 3 0 8 0 mcl64k 65536 4 0 0 1 0 1 1 0 8 0 mcl12k 12288 1 0 0 1 0 1 1 0 8 0 mcl9k 9216 1 0 0 1 0 1 1 0 8 0 mcl8k 8192 1 0 0 1 0 1 1 0 8 0 mcl4k 4096 4 0 0 1 0 1 1 0 8 0 mcl2k 2048 167 0 0 20 0 20 20 0 8 0 mtagpl 80 4 0 0 1 0 1 1 0 8 0 mbufpl 256 167 0 0 10 0 10 10 0 8 0 bufpl 280 4225 0 183 289 0 289 289 0 8 0 anonpl 16 40676 0 24783 65 1 64 64 0 124 0 amapchunkpl 152 1231 0 1079 9 0 9 9 0 158 1 amappl16 192 1147 0 289 44 0 44 44 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 13 0 10 2 1 1 1 0 8 0 amappl13 168 42 0 39 1 0 1 1 0 8 0 amappl12 160 3 0 2 2 1 1 1 0 8 0 amappl11 152 71 0 53 1 0 1 1 0 8 0 amappl10 144 34 0 28 1 0 1 1 0 8 0 amappl9 136 390 0 386 1 0 1 1 0 8 0 amappl8 128 326 0 300 1 0 1 1 0 8 0 amappl7 120 137 0 124 1 0 1 1 0 8 0 amappl6 112 22 0 19 1 0 1 1 0 8 0 amappl5 104 149 0 134 1 0 1 1 0 8 0 amappl4 96 513 0 482 2 1 1 2 0 8 0 amappl3 88 129 0 119 1 0 1 1 0 8 0 amappl2 80 1175 0 1099 3 1 2 3 0 8 0 amappl1 72 16138 0 15680 26 10 16 20 0 8 6 amappl 80 625 0 576 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 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 268 0 251 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 268 0 251 1 0 1 1 0 8 0 vmmpekpl 168 5998 0 5970 2 0 2 2 0 8 0 vmmpepl 168 40000 0 37882 120 6 114 114 0 357 21 vmsppl 368 267 0 251 2 0 2 2 0 8 0 pdppl 4096 544 0 502 6 0 6 6 0 8 0 pvpl 32 142819 0 123715 158 0 158 158 0 265 0 pmappl 232 267 0 251 2 0 2 2 0 8 1 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 165 0 2 5 0 5 5 0 8 0