kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Sun Apr 26 19:10:14 PDT 2020 OpenBSD/amd64 (ci-openbsd-multicore-4.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.149' (ECDSA) to the list of known hosts. 2020/04/26 19:10:23 parsed 1 programs 2020/04/26 19:10:31 executed programs: 0 login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f1ccf00+16 0x0!=0x812749be2268f3cb Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 20067 71504 77 0x100010 0x80 0 dhclient db_enter() at db_enter+0x18 panic(ffffffff821fb2d4) at panic+0x15c pool_cache_get(ffffffff82666320) at pool_cache_get+0x323 pool_get(ffffffff82666320,2) at pool_get+0x91 m_gethdr(2,1) at m_gethdr+0x4c rtm_msg1(2,ffff800020f5f120) at rtm_msg1+0x6e rtm_send(fffffd806f76b460,2,0,0) at rtm_send+0x120 rt_ifa_del(ffff8000009d8e00,200404,ffff8000009d8e40,0) at rt_ifa_del+0x3bb rt_ifa_dellocal(ffff8000009d8e00) at rt_ifa_dellocal+0x149 in6_purgeaddr(ffff8000009d8e00) at in6_purgeaddr+0x114 in6_ifdetach(ffff8000009d5000) at in6_ifdetach+0x74 if_detach(ffff8000009d5000) at if_detach+0x148 tun_clone_destroy(ffff8000009d5000) at tun_clone_destroy+0x1f2 tun_dev_close(5d00,7) at tun_dev_close+0x160 end trace frame: 0xffff800020f5f660, 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806f1ccf00+16 0x0!=0x812749be2268f3cb ddb{1}> trace db_enter() at db_enter+0x18 panic(ffffffff821fb2d4) at panic+0x15c pool_cache_get(ffffffff82666320) at pool_cache_get+0x323 pool_get(ffffffff82666320,2) at pool_get+0x91 m_gethdr(2,1) at m_gethdr+0x4c rtm_msg1(2,ffff800020f5f120) at rtm_msg1+0x6e rtm_send(fffffd806f76b460,2,0,0) at rtm_send+0x120 rt_ifa_del(ffff8000009d8e00,200404,ffff8000009d8e40,0) at rt_ifa_del+0x3bb rt_ifa_dellocal(ffff8000009d8e00) at rt_ifa_dellocal+0x149 in6_purgeaddr(ffff8000009d8e00) at in6_purgeaddr+0x114 in6_ifdetach(ffff8000009d5000) at in6_ifdetach+0x74 if_detach(ffff8000009d5000) at if_detach+0x148 tun_clone_destroy(ffff8000009d5000) at tun_clone_destroy+0x1f2 tun_dev_close(5d00,7) at tun_dev_close+0x160 spec_close(ffff800020f5f670) at spec_close+0x311 VOP_CLOSE(fffffd806e5124e8,7,fffffd807f7bfae0,ffff800020e6c9c8) at VOP_CLOSE+0xc0 vn_closefile(fffffd806d043438,ffff800020e6c9c8) at vn_closefile+0xd7 fdrop(fffffd806d043438,ffff800020e6c9c8) at fdrop+0xc2 closef(fffffd806d043438,ffff800020e6c9c8) at closef+0x11c fdfree(ffff800020e6c9c8) at fdfree+0x101 exit1(ffff800020e6c9c8,0,9,1) at exit1+0x32c postsig(ffff800020e6c9c8,9) at postsig+0x4ed userret(ffff800020e6c9c8) at userret+0x199 recall_trap() at recall_trap+0x8 end of kernel end trace frame: 0x7f7ffffc6550, count: -24 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff800020f5ee40 rbx 0xffff800020f5eef0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff8199412f kprintf+0x16f r9 0x1 r10 0xcd7b9fa55319d34b r11 0x58f39eadc792f763 r12 0x3000000008 r13 0xffff800020f5ee50 r14 0x100 r15 0x1 rip 0xffffffff810c3ce8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020f5ee30 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.0) pid=300082 stat=onproc flags process=a proc=2000 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020e6c008,0xffff800020e6dd58 process=0xffff800020e80010 user=0xffff800020f5a000, vmspace=0xfffffd807f000a10 estcpu=36, cpticks=3, pctcpu=0.0 user=0, sys=1, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 73788 391515 99853 0 3 0x82 thrsleep syz-execprog 73788 187577 99853 0 3 0x4000082 thrsleep syz-execprog 73788 31435 99853 0 3 0x4000082 wait syz-execprog 73788 83572 99853 0 3 0x4000082 thrsleep syz-execprog 73788 427117 99853 0 3 0x4000082 thrsleep syz-execprog 73788 398329 99853 0 3 0x4000082 thrsleep syz-execprog 73788 205388 99853 0 3 0x4000082 thrsleep syz-execprog 73788 78938 99853 0 3 0x4000082 thrsleep syz-execprog 73788 91906 99853 0 3 0x4000082 kqread syz-execprog 99853 331475 86740 0 3 0x10008a pause ksh 86740 42390 33050 0 3 0x92 select sshd 6397 368133 1 0 3 0x100083 ttyin getty 33050 167402 1 0 3 0x80 select sshd 60896 236198 88654 74 3 0x100092 bpf pflogd 88654 520396 1 0 3 0x80 netio pflogd 88045 512208 90871 73 3 0x100090 kqread syslogd 90871 514999 1 0 3 0x100082 netio syslogd 71504 20067 1 77 7 0x100090 dhclient 74238 388871 1 0 3 0x80 poll dhclient 64661 488331 0 0 3 0x14200 bored smr 21668 9068 0 0 3 0x14200 pgzero zerothread 81493 328036 0 0 3 0x14200 aiodoned aiodoned 41411 67033 0 0 3 0x14200 syncer update 6334 482862 0 0 3 0x14200 cleaner cleaner 13611 484571 0 0 3 0x14200 reaper reaper 81822 303180 0 0 3 0x14200 pgdaemon pagedaemon 17275 240681 0 0 3 0x14200 bored crynlk 84808 508750 0 0 3 0x14200 bored crypto 19517 71689 0 0 3 0x40014200 acpi0 acpi0 77794 225369 0 0 3 0x40014200 idle1 31956 298207 0 0 3 0x14200 bored softnet 54755 455060 0 0 2 0x14200 systqmp 4898 24760 0 0 3 0x14200 bored systq 83495 416694 0 0 3 0x40014200 bored softclock 2826 394780 0 0 3 0x40014200 idle0 1 308167 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9464 6395K 6395K 78643K 10557 0 pcb 13 8K 8K 78643K 13 0 rtable 75 2K 2K 78643K 163 0 ifaddr 36 9K 9K 78643K 39 0 counters 41 33K 33K 78643K 41 0 ioctlops 0 0K 4K 78643K 1468 0 mount 1 1K 1K 78643K 1 0 vnodes 1183 74K 75K 78643K 1188 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 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 196K 290K 78643K 12766 0 file desc 2 4K 12K 78643K 18 0 proc 59 63K 83K 78643K 398 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 21 1K 1K 78643K 22 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 19 95K 95K 78643K 19 0 exec 0 0K 1K 78643K 197 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 73 12K 12K 78643K 951 0 UVM aobj 2 2K 2K 78643K 2 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 NDP 6 0K 0K 78643K 7 0 temp 29 3033K 3097K 78643K 1921 0 kqueue 3 4K 4K 78643K 3 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 4 0 2 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 17 0 15 1 0 1 1 0 8 0 rtentry 112 34 0 5 1 0 1 1 0 8 0 unpcb 120 29 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 1 1 0 1 0 8 0 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 34 0 28 1 0 1 1 0 8 0 nd6 48 3 0 1 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 10 0 0 1 0 1 1 0 8 0 pfstkey 112 10 0 0 1 0 1 1 0 8 0 pfstate 328 10 0 0 1 0 1 1 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 256 144 0 2 9 0 9 9 0 8 0 art_table 32 145 0 2 2 0 2 2 0 8 0 art_node 16 33 0 6 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1423 0 20 88 0 88 88 0 8 0 ffsino 272 1423 0 20 94 0 94 94 0 8 0 nchpl 144 1647 0 36 60 0 60 60 0 8 0 uvmvnodes 72 1433 0 0 27 0 27 27 0 8 0 vnodes 208 1433 0 0 76 0 76 76 0 8 0 namei 1024 4162 0 4162 1 0 1 1 0 8 1 percpumem 16 31 0 0 1 0 1 1 0 8 0 scxspl 192 4526 0 4526 2 1 1 2 0 8 1 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 424 241 0 212 4 0 4 4 0 8 0 knotepl 112 39 0 30 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 48 74 0 68 1 0 1 1 0 8 0 pipepl 120 148 0 137 1 0 1 1 0 8 0 fdescpl 496 226 0 212 3 0 3 3 0 8 0 filepl 152 1102 0 1046 3 0 3 3 0 8 0 lockfpl 104 5 0 4 1 0 1 1 0 8 0 lockfspl 48 3 0 2 1 0 1 1 0 8 0 sessionpl 112 19 0 9 1 0 1 1 0 8 0 pgrppl 48 19 0 9 1 0 1 1 0 8 0 ucredpl 96 62 0 53 1 0 1 1 0 8 0 zombiepl 144 213 0 212 1 0 1 1 0 8 0 processpl 984 241 0 212 5 0 5 5 0 8 1 procpl 624 249 0 212 4 0 4 4 0 8 1 sockpl 400 80 0 62 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 75 0 0 10 0 10 10 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 93 0 0 6 0 6 6 0 8 0 bufpl 280 3816 0 189 260 0 260 260 0 8 0 anonpl 16 22266 0 20637 15 1 14 14 0 124 6 amapchunkpl 152 835 0 767 5 0 5 5 0 158 1 amappl16 192 176 0 146 3 0 3 3 0 8 1 amappl15 184 2 0 0 1 0 1 1 0 8 0 amappl14 176 24 0 21 1 0 1 1 0 8 0 amappl13 168 20 0 19 1 0 1 1 0 8 0 amappl12 160 18 0 14 1 0 1 1 0 8 0 amappl11 152 54 0 38 1 0 1 1 0 8 0 amappl10 144 17 0 12 1 0 1 1 0 8 0 amappl9 136 237 0 236 1 0 1 1 0 8 0 amappl8 128 269 0 260 1 0 1 1 0 8 0 amappl7 120 115 0 103 1 0 1 1 0 8 0 amappl6 112 24 0 22 1 0 1 1 0 8 0 amappl5 104 126 0 111 1 0 1 1 0 8 0 amappl4 96 498 0 470 1 0 1 1 0 8 0 amappl3 88 110 0 105 1 0 1 1 0 8 0 amappl2 80 938 0 879 3 0 3 3 0 8 1 amappl1 72 15265 0 14845 25 7 18 20 0 8 8 amappl 80 478 0 450 1 0 1 1 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 24 226 0 212 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 226 0 212 1 0 1 1 0 8 0 vmmpekpl 168 6287 0 6263 2 0 2 2 0 8 0 vmmpepl 168 32635 0 31710 83 2 81 81 0 357 38 vmsppl 368 225 0 212 2 0 2 2 0 8 0 pdppl 4096 460 0 424 6 0 6 6 0 8 0 pvpl 32 112545 0 108504 116 0 116 116 0 265 81 pmappl 232 225 0 212 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 232 0 3 7 0 7 7 0 8 0 ddb{1}>