kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Sun Jul 5 00:57:21 PDT 2020 OpenBSD/amd64 (ci-openbsd-main-4.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts. 2020/07/05 00:57:43 parsed 1 programs 2020/07/05 00:57:48 executed programs: 0 login: panic: pool_do_get: mbufpl free list modified: page 0xfffffd806205c000; item addr 0xfffffd806205c100; offset 0x0=0x9a6f0a08c8f10000 != 0x9a6f0a08c8f1538f Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND db_enter() at db_enter+0x18 panic(ffffffff8246c261) at panic+0x15c pool_do_get(ffffffff828189f0,2,ffff80001d7795b8) at pool_do_get+0x42a pool_get(ffffffff828189f0,2) at pool_get+0xb5 m_gethdr(2,1) at m_gethdr+0x4c rtm_msg1(2,ffff80001d779710) at rtm_msg1+0x6e rtm_send(fffffd805e319850,2,0,0) at rtm_send+0x120 rt_ifa_del(ffff8000006b5200,800100,ffff8000006b5258,0) at rt_ifa_del+0x3bb in_purgeaddr(ffff8000006b5200) at in_purgeaddr+0xc6 in_ifdetach(ffff800000ac3800) at in_ifdetach+0x74 if_detach(ffff800000ac3800) at if_detach+0x140 tun_clone_destroy(ffff800000ac3800) at tun_clone_destroy+0x1d8 tun_dev_close(5d00,7) at tun_dev_close+0x160 spec_close(ffff80001d779bb0) at spec_close+0x311 end trace frame: 0xffff80001d779c20, 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> ddb> set $lines = 0 ddb> set $maxwidth = 0 ddb> show panic pool_do_get: mbufpl free list modified: page 0xfffffd806205c000; item addr 0xfffffd806205c100; offset 0x0=0x9a6f0a08c8f10000 != 0x9a6f0a08c8f1538f ddb> trace db_enter() at db_enter+0x18 panic(ffffffff8246c261) at panic+0x15c pool_do_get(ffffffff828189f0,2,ffff80001d7795b8) at pool_do_get+0x42a pool_get(ffffffff828189f0,2) at pool_get+0xb5 m_gethdr(2,1) at m_gethdr+0x4c rtm_msg1(2,ffff80001d779710) at rtm_msg1+0x6e rtm_send(fffffd805e319850,2,0,0) at rtm_send+0x120 rt_ifa_del(ffff8000006b5200,800100,ffff8000006b5258,0) at rt_ifa_del+0x3bb in_purgeaddr(ffff8000006b5200) at in_purgeaddr+0xc6 in_ifdetach(ffff800000ac3800) at in_ifdetach+0x74 if_detach(ffff800000ac3800) at if_detach+0x140 tun_clone_destroy(ffff800000ac3800) at tun_clone_destroy+0x1d8 tun_dev_close(5d00,7) at tun_dev_close+0x160 spec_close(ffff80001d779bb0) at spec_close+0x311 VOP_CLOSE(fffffd8061665c30,7,fffffd806c3bfd20,ffff80001d6a9c38) at VOP_CLOSE+0xc0 vn_closefile(fffffd80619f72d0,ffff80001d6a9c38) at vn_closefile+0xd2 fdrop(fffffd80619f72d0,ffff80001d6a9c38) at fdrop+0xc2 closef(fffffd80619f72d0,ffff80001d6a9c38) at closef+0x117 fdfree(ffff80001d6a9c38) at fdfree+0x100 exit1(ffff80001d6a9c38,0,9,1) at exit1+0x32c postsig(ffff80001d6a9c38,9) at postsig+0x4b2 userret(ffff80001d6a9c38) at userret+0x159 syscall(ffff80001d77a030) at syscall+0x42e Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd2480, count: -24 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d779420 rbx 0xffff80001d7794d0 rdx 0x2 rcx 0 rax 0x1 r8 0xffffffff8201b2ff kprintf+0x15f r9 0x1 r10 0x2 r11 0x16a4920cc4c9616 r12 0x3000000008 r13 0xffff80001d779430 r14 0x100 r15 0x1 rip 0xffffffff822f9738 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d779410 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (syz-executor.0) pid=321120 stat=onproc flags process=a proc=2000 pri=32, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff80001d6a9ea8,0xffffffff8284cea8 process=0xffff8000ffffb938 user=0xffff80001d775000, vmspace=0xfffffd806bc0a440 estcpu=1, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 95079 443894 50728 0 3 0x82 thrsleep syz-execprog 95079 383790 50728 0 3 0x4000082 thrsleep syz-execprog 95079 238757 50728 0 3 0x4000082 thrsleep syz-execprog 95079 331352 50728 0 3 0x4000082 thrsleep syz-execprog 95079 211401 50728 0 3 0x4000082 wait syz-execprog 95079 344745 50728 0 3 0x4000082 kqread syz-execprog 95079 277260 50728 0 3 0x4000082 thrsleep syz-execprog 50728 215939 70902 0 3 0x10008a pause ksh 70902 154116 97938 0 3 0x92 select sshd 23775 493500 1 0 3 0x100083 ttyin getty 97938 445753 1 0 3 0x80 select sshd 60100 152059 70204 73 3 0x100090 kqread syslogd 70204 360033 1 0 3 0x100082 netio syslogd 32962 308065 1 77 3 0x100090 poll dhclient 45157 521336 1 0 3 0x80 poll dhclient 47383 44712 0 0 3 0x14200 bored smr 98445 272625 0 0 3 0x14200 pgzero zerothread 68557 222491 0 0 3 0x14200 aiodoned aiodoned 44163 403537 0 0 3 0x14200 syncer update 93653 39693 0 0 3 0x14200 cleaner cleaner 25 493516 0 0 3 0x14200 reaper reaper 7735 54441 0 0 3 0x14200 pgdaemon pagedaemon 48545 212875 0 0 3 0x14200 bored crynlk 78724 487390 0 0 3 0x14200 bored crypto 44487 419807 0 0 3 0x40014200 acpi0 acpi0 5336 221084 0 0 3 0x14200 bored softnet 12776 351616 0 0 2 0x14200 systqmp 12280 166194 0 0 3 0x14200 bored systq 31368 266963 0 0 3 0x40014200 bored softclock 63084 109347 0 0 3 0x40014200 idle0 1 517188 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show all locks No such command ddb> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 9442 6321K 6321K 78643K 10543 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 153 0 ifaddr 32 8K 9K 78643K 33 0 counters 20 16K 16K 78643K 20 0 ioctlops 0 0K 2K 78643K 14 0 mount 1 1K 1K 78643K 1 0 vnodes 1182 74K 74K 78643K 1187 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 0K 0K 78643K 2 0 sem 2 0K 0K 78643K 2 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1809 195K 288K 78643K 12938 0 file desc 2 4K 12K 78643K 18 0 proc 47 38K 54K 78643K 318 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 in_multi 22 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 171 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 67 11K 11K 78643K 836 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 6 0 temp 23 3845K 3909K 78643K 1626 0 kqueue 3 4K 4K 78643K 3 0 SYN cache 2 16K 16K 78643K 2 0 ddb> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 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 1 1 0 1 1 0 8 0 unpcb 120 27 0 19 1 0 1 1 0 8 0 syncache 264 5 0 5 2 1 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 296 27 0 21 1 0 1 1 0 8 0 nd6 48 3 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 144 0 0 9 0 9 9 0 8 0 art_table 32 145 0 0 2 0 2 2 0 8 0 art_node 16 33 0 3 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 1415 0 22 88 0 88 88 0 8 0 ffsino 240 1415 0 22 82 0 82 82 0 8 0 nchpl 144 1634 0 39 60 0 60 60 0 8 0 uvmvnodes 72 1424 0 0 26 0 26 26 0 8 0 vnodes 208 1424 0 0 75 0 75 75 0 8 0 namei 1024 3941 0 3941 2 1 1 1 0 8 1 scxspl 192 4407 0 4407 1 0 1 1 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 424 212 0 186 4 0 4 4 0 8 0 knotepl 112 47 0 38 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipepl 272 70 0 64 2 1 1 1 0 8 0 fdescpl 432 198 0 186 2 0 2 2 0 8 0 filepl 120 980 0 929 2 0 2 2 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 18 0 9 1 0 1 1 0 8 0 pgrppl 48 18 0 9 1 0 1 1 0 8 0 ucredpl 96 57 0 50 1 0 1 1 0 8 0 zombiepl 144 187 0 186 2 1 1 1 0 8 0 processpl 920 212 0 186 4 0 4 4 0 8 0 procpl 624 218 0 186 3 0 3 3 0 8 0 sockpl 400 71 0 55 2 0 2 2 0 8 0 mcl4k 4096 10 0 10 2 1 1 1 0 8 1 mcl2k 2048 5544 0 5516 6 2 4 6 0 8 0 mtagpl 96 2 0 2 1 1 0 1 0 8 0 mbufpl 256 9642 0 9580 7 2 5 5 0 8 0 mbufpl: pool(0xffffffff828189f0:mbufpl): free list modified: page 0xfffffd806205c000; item ordinal 0; addr 0xfffffd806205c100 (p 0xfffffd805e10c000); offset 0x0=0x9a6f0a08c8f10000 bufpl 280 2961 0 126 203 0 203 203 0 8 0 anonpl 16 20326 0 18846 14 2 12 12 0 107 4 amapchunkpl 152 643 0 583 4 0 4 4 0 158 1 amappl16 192 125 0 97 2 0 2 2 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 26 0 23 1 0 1 1 0 8 0 amappl13 168 22 0 19 2 1 1 1 0 8 0 amappl12 160 8 0 5 2 1 1 1 0 8 0 amappl11 152 41 0 32 1 0 1 1 0 8 0 amappl10 144 11 0 8 1 0 1 1 0 8 0 amappl9 136 221 0 219 1 0 1 1 0 8 0 amappl8 128 236 0 229 1 0 1 1 0 8 0 amappl7 120 101 0 91 1 0 1 1 0 8 0 amappl6 112 19 0 17 2 1 1 1 0 8 0 amappl5 104 139 0 129 1 0 1 1 0 8 0 amappl4 96 435 0 410 1 0 1 1 0 8 0 amappl3 88 109 0 102 1 0 1 1 0 8 0 amappl2 80 816 0 761 3 1 2 2 0 8 0 amappl1 72 13573 0 13191 25 8 17 17 0 8 9 amappl 80 421 0 396 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 24 198 0 186 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 198 0 186 1 0 1 1 0 8 0 vmmpekpl 168 6135 0 6115 1 0 1 1 0 8 0 vmmpepl 168 28851 0 28019 81 12 69 69 0 357 30 vmsppl 272 197 0 186 1 0 1 1 0 8 0 pdppl 4096 402 0 372 5 0 5 5 0 8 0 pvpl 32 104853 0 101140 106 4 102 102 0 265 70 pmappl 200 197 0 186 1 0 1 1 0 8 0 extentpl 40 53 0 36 1 0 1 1 0 8 0 phpool 112 216 0 9 6 0 6 6 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 panic(ffffffff8246c261) at panic+0x15c pool_do_get(ffffffff828189f0,2,ffff80001d7795b8) at pool_do_get+0x42a pool_get(ffffffff828189f0,2) at pool_get+0xb5 m_gethdr(2,1) at m_gethdr+0x4c rtm_msg1(2,ffff80001d779710) at rtm_msg1+0x6e rtm_send(fffffd805e319850,2,0,0) at rtm_send+0x120 rt_ifa_del(ffff8000006b5200,800100,ffff8000006b5258,0) at rt_ifa_del+0x3bb in_purgeaddr(ffff8000006b5200) at in_purgeaddr+0xc6 in_ifdetach(ffff800000ac3800) at in_ifdetach+0x74 if_detach(ffff800000ac3800) at if_detach+0x140 tun_clone_destroy(ffff800000ac3800) at tun_clone_destroy+0x1d8 tun_dev_close(5d00,7) at tun_dev_close+0x160 spec_close(ffff80001d779bb0) at spec_close+0x311 VOP_CLOSE(fffffd8061665c30,7,fffffd806c3bfd20,ffff80001d6a9c38) at VOP_CLOSE+0xc0 vn_closefile(fffffd80619f72d0,ffff80001d6a9c38) at vn_closefile+0xd2 fdrop(fffffd80619f72d0,ffff80001d6a9c38) at fdrop+0xc2 closef(fffffd80619f72d0,ffff80001d6a9c38) at closef+0x117 fdfree(ffff80001d6a9c38) at fdfree+0x100 exit1(ffff80001d6a9c38,0,9,1) at exit1+0x32c postsig(ffff80001d6a9c38,9) at postsig+0x4b2 userret(ffff80001d6a9c38) at userret+0x159 syscall(ffff80001d77a030) at syscall+0x42e Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd2480, count: -24 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 panic(ffffffff8246c261) at panic+0x15c pool_do_get(ffffffff828189f0,2,ffff80001d7795b8) at pool_do_get+0x42a pool_get(ffffffff828189f0,2) at pool_get+0xb5 m_gethdr(2,1) at m_gethdr+0x4c rtm_msg1(2,ffff80001d779710) at rtm_msg1+0x6e rtm_send(fffffd805e319850,2,0,0) at rtm_send+0x120 rt_ifa_del(ffff8000006b5200,800100,ffff8000006b5258,0) at rt_ifa_del+0x3bb in_purgeaddr(ffff8000006b5200) at in_purgeaddr+0xc6 in_ifdetach(ffff800000ac3800) at in_ifdetach+0x74 if_detach(ffff800000ac3800) at if_detach+0x140 tun_clone_destroy(ffff800000ac3800) at tun_clone_destroy+0x1d8 tun_dev_close(5d00,7) at tun_dev_close+0x160 spec_close(ffff80001d779bb0) at spec_close+0x311 VOP_CLOSE(fffffd8061665c30,7,fffffd806c3bfd20,ffff80001d6a9c38) at VOP_CLOSE+0xc0 vn_closefile(fffffd80619f72d0,ffff80001d6a9c38) at vn_closefile+0xd2 fdrop(fffffd80619f72d0,ffff80001d6a9c38) at fdrop+0xc2 closef(fffffd80619f72d0,ffff80001d6a9c38) at closef+0x117 fdfree(ffff80001d6a9c38) at fdfree+0x100 exit1(ffff80001d6a9c38,0,9,1) at exit1+0x32c postsig(ffff80001d6a9c38,9) at postsig+0x4b2 userret(ffff80001d6a9c38) at userret+0x159 syscall(ffff80001d77a030) at syscall+0x42e Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffd2480, count: -24 ddb>