kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Fri May 8 10:25:10 PDT 2020 OpenBSD/amd64 (ci-openbsd-main-5.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.83' (ECDSA) to the list of known hosts. 2020/05/08 10:25:21 parsed 1 programs 2020/05/08 10:25:25 executed programs: 0 login: panic: pool_do_get: mbufpl free list modified: page 0xfffffd805c2ef000; item addr 0xfffffd805c2ef200; offset 0x0=0x0 != 0x9e3d8fd8b034bc94 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *424460 56550 0 0x14000 0x40000200 0 softclock db_enter() at db_enter+0x18 panic(ffffffff8224b1e1) at panic+0x15c pool_do_get(ffffffff825735f0,2,ffff80001d6f5f08) at pool_do_get+0x42a pool_get(ffffffff825735f0,2) at pool_get+0xb5 m_get(2,1) at m_get+0x4c mld6_sendpkt(ffff8000009de900,83,0) at mld6_sendpkt+0xaf mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff82517f20) at pffasttimo+0x85 softclock_thread(ffff80001d6e19c0) at softclock_thread+0x155 end trace frame: 0x0, count: 6 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 0xfffffd805c2ef000; item addr 0xfffffd805c2ef200; offset 0x0=0x0 != 0x9e3d8fd8b034bc94 ddb> trace db_enter() at db_enter+0x18 panic(ffffffff8224b1e1) at panic+0x15c pool_do_get(ffffffff825735f0,2,ffff80001d6f5f08) at pool_do_get+0x42a pool_get(ffffffff825735f0,2) at pool_get+0xb5 m_get(2,1) at m_get+0x4c mld6_sendpkt(ffff8000009de900,83,0) at mld6_sendpkt+0xaf mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff82517f20) at pffasttimo+0x85 softclock_thread(ffff80001d6e19c0) at softclock_thread+0x155 end trace frame: 0x0, count: -9 ddb> show registers rdi 0 rsi 0x1 rbp 0xffff80001d6f5d70 rbx 0xffff80001d6f5e20 rdx 0x2 rcx 0x1 rax 0x1 r8 0xffff80001d6f5d30 r9 0x1 r10 0x90327b3ab950f908 r11 0x2e70e1989b4d5c5f r12 0x3000000008 r13 0xffff80001d6f5d80 r14 0x100 r15 0x1 rip 0xffffffff8207bbb8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80001d6f5d60 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb> show proc PROC (softclock) pid=424460 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff80001d6e25f0,0xffff80001d6e1760 process=0xffff8000fffff1f8 user=0xffff80001d6f1000, vmspace=0xffffffff825b43a0 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND 87609 481715 29736 0 3 0x82 nanosleep syz-executor.0 29736 228949 4949 0 3 0x82 thrsleep syz-execprog 29736 132324 4949 0 3 0x4000082 nanosleep syz-execprog 29736 437838 4949 0 3 0x4000082 kqread syz-execprog 29736 110933 4949 0 3 0x4000082 thrsleep syz-execprog 29736 512334 4949 0 3 0x4000082 thrsleep syz-execprog 29736 421644 4949 0 3 0x4000082 thrsleep syz-execprog 29736 46242 4949 0 3 0x4000082 thrsleep syz-execprog 29736 75192 4949 0 3 0x4000082 thrsleep syz-execprog 4949 276154 24266 0 3 0x10008a pause ksh 24266 415023 22328 0 3 0x92 select sshd 21133 84831 1 0 3 0x100083 ttyin getty 22328 421134 1 0 3 0x80 select sshd 13406 448417 30565 73 3 0x100090 kqread syslogd 30565 18841 1 0 3 0x100082 netio syslogd 75753 443501 1 77 3 0x100090 poll dhclient 67140 218635 1 0 3 0x80 poll dhclient 63941 87106 0 0 3 0x14200 bored smr 13246 486413 0 0 3 0x14200 pgzero zerothread 79626 499149 0 0 3 0x14200 aiodoned aiodoned 80192 309817 0 0 3 0x14200 syncer update 78624 353197 0 0 3 0x14200 cleaner cleaner 39726 400693 0 0 3 0x14200 reaper reaper 896 9707 0 0 3 0x14200 pgdaemon pagedaemon 49977 206383 0 0 3 0x14200 bored crynlk 62544 500425 0 0 3 0x14200 bored crypto 397 15206 0 0 3 0x40014200 acpi0 acpi0 41944 280799 0 0 3 0x14200 bored softnet 2780 182795 0 0 3 0x14200 bored systqmp 98208 506558 0 0 3 0x14200 bored systq *56550 424460 0 0 7 0x40014200 softclock 37723 265927 0 0 3 0x40014200 idle0 1 183947 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 9443 6321K 6321K 78643K 10540 0 pcb 13 8K 8K 78643K 13 0 rtable 83 2K 2K 78643K 153 0 ifaddr 32 8K 9K 78643K 179 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 1794 195K 288K 78643K 12646 0 file desc 2 4K 12K 78643K 164 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 69 11K 12K 78643K 986 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 4 0K 0K 78643K 6 0 temp 23 3029K 3093K 78643K 1913 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 1 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 173 0 167 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 1561 0 167 88 0 88 88 0 8 0 ffsino 240 1561 0 167 83 0 83 83 0 8 1 nchpl 144 1923 0 329 60 0 60 60 0 8 0 uvmvnodes 72 1570 0 0 29 0 29 29 0 8 0 vnodes 208 1570 0 0 83 0 83 83 0 8 0 namei 1024 4497 0 4497 1 0 1 1 0 8 1 scxspl 192 4545 0 4545 1 0 1 1 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 424 358 0 332 4 0 4 4 0 8 0 knotepl 112 47 0 36 1 0 1 1 0 8 0 kqueuepl 144 2 0 0 1 0 1 1 0 8 0 pipelkpl 16 70 0 63 1 0 1 1 0 8 0 pipepl 120 140 0 127 1 0 1 1 0 8 0 fdescpl 432 344 0 332 2 0 2 2 0 8 0 filepl 120 1264 0 1211 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 144 332 0 331 1 0 1 1 0 8 0 processpl 920 358 0 331 4 0 4 4 0 8 0 procpl 624 365 0 331 3 0 3 3 0 8 0 sockpl 400 217 0 201 2 0 2 2 0 8 0 mcl4k 4096 10 0 10 1 0 1 1 0 8 1 mcl2k 2048 5503 0 5464 8 2 6 8 0 8 0 mtagpl 80 2 0 2 1 1 0 1 0 8 0 mbufpl 256 9799 0 9711 7 1 6 6 0 8 0 mbufpl: pool(0xffffffff825735f0:mbufpl): free list modified: page 0xfffffd805c2ef000; item ordinal 0; addr 0xfffffd805c2ef200 (p 0xfffffd806a4a5000); offset 0x0=0x0 mbufpl: pool(0xffffffff825735f0:mbufpl): page inconsistency: page 0xfffffd805c2ef000; item ordinal 1; addr 0xdac2dda8a268d3af bufpl 280 3039 0 126 209 0 209 209 0 8 0 anonpl 16 24775 0 22620 14 2 12 12 0 107 2 amapchunkpl 152 836 0 777 4 0 4 4 0 158 0 amappl16 192 779 0 698 5 0 5 5 0 8 0 amappl15 184 1 0 0 1 0 1 1 0 8 0 amappl14 176 27 0 23 1 0 1 1 0 8 0 amappl13 168 19 0 17 1 0 1 1 0 8 0 amappl12 160 8 0 7 1 0 1 1 0 8 0 amappl11 152 190 0 180 1 0 1 1 0 8 0 amappl10 144 10 0 6 1 0 1 1 0 8 0 amappl9 136 210 0 209 1 0 1 1 0 8 0 amappl8 128 240 0 231 1 0 1 1 0 8 0 amappl7 120 102 0 91 1 0 1 1 0 8 0 amappl6 112 169 0 165 1 0 1 1 0 8 0 amappl5 104 160 0 151 1 0 1 1 0 8 0 amappl4 96 576 0 550 1 0 1 1 0 8 0 amappl3 88 107 0 101 1 0 1 1 0 8 0 amappl2 80 1100 0 1048 2 0 2 2 0 8 0 amappl1 72 15037 0 14649 23 6 17 17 0 8 8 amappl 80 566 0 541 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 24 344 0 332 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 344 0 332 1 0 1 1 0 8 0 vmmpekpl 168 6452 0 6434 1 0 1 1 0 8 0 vmmpepl 168 35277 0 34383 75 6 69 69 0 357 30 vmsppl 272 343 0 332 1 0 1 1 0 8 0 pdppl 4096 694 0 664 5 0 5 5 0 8 0 pvpl 32 121391 0 116911 102 0 102 102 0 265 64 pmappl 200 343 0 332 1 0 1 1 0 8 0 extentpl 40 46 0 29 1 0 1 1 0 8 0 phpool 112 215 0 5 6 0 6 6 0 8 0 ddb> machine ddbcpu 0 No such command ddb> trace db_enter() at db_enter+0x18 panic(ffffffff8224b1e1) at panic+0x15c pool_do_get(ffffffff825735f0,2,ffff80001d6f5f08) at pool_do_get+0x42a pool_get(ffffffff825735f0,2) at pool_get+0xb5 m_get(2,1) at m_get+0x4c mld6_sendpkt(ffff8000009de900,83,0) at mld6_sendpkt+0xaf mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff82517f20) at pffasttimo+0x85 softclock_thread(ffff80001d6e19c0) at softclock_thread+0x155 end trace frame: 0x0, count: -9 ddb> machine ddbcpu 1 No such command ddb> trace db_enter() at db_enter+0x18 panic(ffffffff8224b1e1) at panic+0x15c pool_do_get(ffffffff825735f0,2,ffff80001d6f5f08) at pool_do_get+0x42a pool_get(ffffffff825735f0,2) at pool_get+0xb5 m_get(2,1) at m_get+0x4c mld6_sendpkt(ffff8000009de900,83,0) at mld6_sendpkt+0xaf mld6_fasttimeo() at mld6_fasttimeo+0x162 pffasttimo(ffffffff82517f20) at pffasttimo+0x85 softclock_thread(ffff80001d6e19c0) at softclock_thread+0x155 end trace frame: 0x0, count: -9 ddb>