kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Tue Sep 24 02:56:01 PDT 2019 OpenBSD/amd64 (ci-openbsd-multicore-2.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.209' (ECDSA) to the list of known hosts. 2019/09/24 02:56:30 parsed 1 programs 2019/09/24 02:56:37 executed programs: 0 login: panic: pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d5fa400+16 0x0!=0xb7c5c3c23675a8bd Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *191899 5272 0 0x14000 0x40000200 0K softclock db_enter() at db_enter+0x18 panic() at panic+0x15c pool_cache_get(ffffffff8261fc90) at pool_cache_get+0x323 pool_get() at pool_get+0x91 m_copyback(fffffd806f0b2400,80,20,ffff800000a7b640,2) at m_copyback+0x4d7 rtm_msg1(14,ffff800020a25d18) at rtm_msg1+0x1b2 rtm_addr(14,ffff800000a46d00) at rtm_addr+0x9b nd6_dad_timer(ffff800000a46d00) at nd6_dad_timer+0x2f8 timeout_run(ffff800000a5d430) at timeout_run+0xc4 softclock_thread(ffff800020a10c58) at softclock_thread+0x16a end trace frame: 0x0, count: 5 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 pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d5fa400+16 0x0!=0xb7c5c3c23675a8bd ddb{0}> trace db_enter() at db_enter+0x18 panic() at panic+0x15c pool_cache_get(ffffffff8261fc90) at pool_cache_get+0x323 pool_get() at pool_get+0x91 m_copyback(fffffd806f0b2400,80,20,ffff800000a7b640,2) at m_copyback+0x4d7 rtm_msg1(14,ffff800020a25d18) at rtm_msg1+0x1b2 rtm_addr(14,ffff800000a46d00) at rtm_addr+0x9b nd6_dad_timer(ffff800000a46d00) at nd6_dad_timer+0x2f8 timeout_run(ffff800000a5d430) at timeout_run+0xc4 softclock_thread(ffff800020a10c58) at softclock_thread+0x16a end trace frame: 0x0, count: -10 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020a259f0 rbx 0xffff800020a25aa0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff81e6f5af kprintf+0x16f r9 0x1 r10 0xa4c8a32d46450d19 r11 0xe9057a55834c9844 r12 0x3000000008 r13 0xffff800020a25a00 r14 0x100 r15 0x1 rip 0xffffffff81584398 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020a259e0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (softclock) pid=191899 stat=onproc flags process=14000 proc=40000200 pri=0, usrpri=50, nice=20 forw=0xffffffffffffffff, list=0xffff800020a10ed0,0xffff800020a10778 process=0xffff800020a12a80 user=0xffff800020a20000, vmspace=0xffffffff82639390 estcpu=0, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND 6633 72896 12688 0 3 0x82 nanosleep syz-executor.0 12688 171013 88897 0 3 0x82 thrsleep syz-execprog 12688 309842 88897 0 3 0x4000082 nanosleep syz-execprog 12688 461485 88897 0 3 0x4000082 thrsleep syz-execprog 12688 412204 88897 0 3 0x4000082 thrsleep syz-execprog 12688 265564 88897 0 3 0x4000082 thrsleep syz-execprog 12688 371025 88897 0 3 0x4000082 thrsleep syz-execprog 12688 162273 88897 0 3 0x4000082 thrsleep syz-execprog 12688 59915 88897 0 3 0x4000082 thrsleep syz-execprog 12688 227749 88897 0 3 0x4000082 kqread syz-execprog 88897 130401 61239 0 3 0x10008a pause ksh 61239 248110 38601 0 3 0x92 select sshd 51203 13221 1 0 3 0x100083 ttyin getty 38601 141622 1 0 3 0x80 select sshd 79190 399559 70423 74 3 0x100092 bpf pflogd 70423 339306 1 0 3 0x80 netio pflogd 40167 337600 13576 73 3 0x100090 kqread syslogd 13576 516706 1 0 3 0x100082 netio syslogd 9724 26108 1 77 3 0x100090 poll dhclient 92116 251189 1 0 3 0x80 poll dhclient 3332 222670 0 0 3 0x14200 pgzero zerothread 23964 100851 0 0 3 0x14200 aiodoned aiodoned 10596 159197 0 0 3 0x14200 syncer update 26695 199786 0 0 3 0x14200 cleaner cleaner 80701 82943 0 0 3 0x14200 reaper reaper 23865 221810 0 0 3 0x14200 pgdaemon pagedaemon 74519 313180 0 0 3 0x14200 bored crynlk 75444 511252 0 0 3 0x14200 bored crypto 65621 500378 0 0 3 0x40014200 acpi0 acpi0 33888 366285 0 0 7 0x40014200 idle1 53983 353330 0 0 3 0x14200 bored softnet 67275 221710 0 0 3 0x14200 bored systqmp 21831 316678 0 0 3 0x14200 bored systq * 5272 191899 0 0 7 0x40014200 softclock 29716 62870 0 0 3 0x40014200 idle0 28177 284864 0 0 3 0x14200 bored smr 1 419742 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 5272 (softclock) thread 0xffff800020a10c58 (191899) exclusive rwlock netlock r = 0 (0xffffffff8247b378) #0 witness_lock+0x52e #1 nd6_dad_timer+0x34 #2 timeout_run+0xc4 #3 softclock_thread+0x16a #4 proc_trampoline+0x1c shared rwlock timeout r = 0 (0xffffffff8250ed18) #0 witness_lock+0x52e #1 timeout_run+0xb9 #2 softclock_thread+0x16a #3 proc_trampoline+0x1c exclusive kernel_lock &kernel_lock r = 0 (0xffffffff826195b8) #0 witness_lock+0x52e #1 __mp_acquire_count+0x51 #2 mi_switch+0x392 #3 sleep_finish+0x113 #4 softclock_thread+0x103 #5 proc_trampoline+0x1c ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9457 6385K 6385K 78643K 10544 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 77 2K 2K 78643K 165 0 0 ifaddr 32 9K 9K 78643K 75 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1468 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1181 74K 74K 78643K 1186 0 0 UFS quota 1 32K 32K 78643K 1 0 0 UFS mount 5 36K 36K 78643K 5 0 0 shm 2 1K 1K 78643K 2 0 0 VM map 2 1K 1K 78643K 2 0 0 sem 2 0K 0K 78643K 2 0 0 dirhash 12 2K 2K 78643K 12 0 0 ACPI 1808 196K 290K 78643K 12765 0 0 file desc 2 4K 12K 78643K 60 0 0 proc 59 63K 83K 78643K 384 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 22 1K 1K 78643K 22 0 0 ether_multi 1 0K 0K 78643K 1 0 0 ISOFS mount 1 32K 32K 78643K 1 0 0 MSDOSFS mount 1 16K 16K 78643K 1 0 0 ttys 18 79K 79K 78643K 18 0 0 exec 0 0K 1K 78643K 199 0 0 pagedep 1 8K 8K 78643K 1 0 0 inodedep 1 32K 32K 78643K 1 0 0 newblk 1 0K 0K 78643K 1 0 0 VM swap 7 26K 26K 78643K 7 0 0 UVM amap 71 11K 12K 78643K 1003 0 0 UVM aobj 2 2K 2K 78643K 2 0 0 memdesc 1 4K 4K 78643K 1 0 0 crypto data 1 1K 1K 78643K 1 0 0 NDP 7 0K 0K 78643K 7 0 0 temp 48 3538K 3602K 78643K 3421 0 0 SYN cache 2 16K 16K 78643K 2 0 0 ddb{0}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle arp 64 4 0 1 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 4 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 0 1 1 0 8 1 tcpcb 544 8 0 5 1 0 1 1 0 8 0 inpcb 280 76 0 70 1 0 1 1 0 8 0 nd6 48 2 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 10 0 2 1 0 1 1 0 8 0 pfstkey 112 10 0 2 1 0 1 1 0 8 0 pfstate 328 10 0 2 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 256 167 0 2 11 0 11 11 0 8 0 art_table 32 168 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 dino1pl 128 1464 0 62 46 0 46 46 0 8 0 ffsino 272 1464 0 62 94 0 94 94 0 8 0 nchpl 144 1745 0 134 60 0 60 60 0 8 0 uvmvnodes 72 1474 0 0 27 0 27 27 0 8 0 vnodes 208 1474 0 0 78 0 78 78 0 8 0 namei 1024 4310 0 4310 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 4478 0 4478 8 2 6 7 0 8 6 plimitpl 152 15 0 8 1 0 1 1 0 8 0 sigapl 432 268 0 255 2 0 2 2 0 8 0 knotepl 112 39 0 28 1 0 1 1 0 8 0 kqueuepl 104 2 0 0 1 0 1 1 0 8 0 pipepl 112 154 0 141 2 1 1 1 0 8 0 fdescpl 488 269 0 255 3 0 3 3 0 8 0 filepl 152 1205 0 1147 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 52 0 43 1 0 1 1 0 8 0 zombiepl 144 255 0 254 2 1 1 1 0 8 0 processpl 896 284 0 254 4 0 4 4 0 8 0 procpl 632 292 0 254 4 0 4 4 0 8 0 sockpl 384 122 0 104 2 0 2 2 0 8 0 mcl4k 4096 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 72 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 102 0 0 6 0 6 6 0 8 0 bufpl 256 5927 0 1315 289 0 289 289 0 8 0 anonpl 16 23316 0 21701 15 2 13 13 0 124 6 amapchunkpl 152 869 0 802 5 0 5 5 0 158 1 amappl16 192 278 0 247 2 0 2 2 0 8 0 amappl15 184 87 0 85 1 0 1 1 0 8 0 amappl14 176 27 0 23 2 1 1 1 0 8 0 amappl12 160 7 0 7 1 0 1 1 0 8 1 amappl11 152 53 0 37 1 0 1 1 0 8 0 amappl10 144 13 0 10 1 0 1 1 0 8 0 amappl9 136 460 0 455 1 0 1 1 0 8 0 amappl8 128 129 0 119 1 0 1 1 0 8 0 amappl7 120 33 0 30 1 0 1 1 0 8 0 amappl6 112 77 0 68 1 0 1 1 0 8 0 amappl5 104 124 0 110 1 0 1 1 0 8 0 amappl4 96 538 0 510 1 0 1 1 0 8 0 amappl3 88 116 0 110 1 0 1 1 0 8 0 amappl2 80 1035 0 974 4 1 3 3 0 8 1 amappl1 72 15768 0 15348 26 8 18 20 0 8 8 amappl 80 521 0 492 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 17 0 17 1 1 0 1 0 8 0 aobjpl 64 1 0 0 1 0 1 1 0 8 0 uaddrrnd 24 269 0 255 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 269 0 255 1 0 1 1 0 8 0 vmmpekpl 168 6497 0 6474 2 0 2 2 0 8 0 vmmpepl 168 34525 0 33604 93 13 80 80 0 357 39 vmsppl 368 268 0 255 2 0 2 2 0 8 0 pdppl 4096 545 0 510 6 0 6 6 0 8 1 pvpl 32 116926 0 112937 119 4 115 115 0 265 81 pmappl 232 268 0 255 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 429 0 4 13 0 13 13 0 8 0