kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Mon Aug 12 02:54:17 PDT 2019 OpenBSD/amd64 (ci-openbsd-multicore-3.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.1.11' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program login: vput: bad ref count: 0xfffffd8076dcb268, type VBAD, use 0, write 4294967295, hold 0, flags (VBIOONFREELIST) panic: vput: ref cnt Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *307047 84887 0 0 0 0K syz-executor7760 79340 3092 0 0 0 1 syz-executor7760 db_enter() at db_enter+0x18 panic() at panic+0x15c vput(fffffd8076dcb268) at vput+0x14b vn_close(fffffd8076dcb268,2,fffffd807f7c6ae0,ffff800020afe9e8) at vn_close+0xfb sys_acct(ffff800020afe9e8,ffff800020bc3988,ffff800020bc39f0) at sys_acct+0x15b syscall(ffff800020bc3a60) at syscall+0x552 Xsyscall(6,0,2,0,431bde82d7b634db,7f7fffff78b0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff7910, count: 8 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 vput: ref cnt ddb{0}> trace db_enter() at db_enter+0x18 panic() at panic+0x15c vput(fffffd8076dcb268) at vput+0x14b vn_close(fffffd8076dcb268,2,fffffd807f7c6ae0,ffff800020afe9e8) at vn_close+0xfb sys_acct(ffff800020afe9e8,ffff800020bc3988,ffff800020bc39f0) at sys_acct+0x15b syscall(ffff800020bc3a60) at syscall+0x552 Xsyscall(6,0,2,0,431bde82d7b634db,7f7fffff78b0) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7fffff7910, count: -7 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020bc3700 rbx 0xffff800020bc37b0 rdx 0x8b rcx 0x2 rax 0x1 r8 0xffffffff815a9073 kprintf+0x173 r9 0x1 r10 0x277b1cf6cdabbe2 r11 0xe9d34a32f11cd0f0 r12 0x3000000008 r13 0xffff800020bc3710 r14 0x100 r15 0x1 rip 0xffffffff81e595e8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020bc36f0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor7760) pid=307047 stat=onproc flags process=0 proc=0 pri=32, usrpri=53, nice=20 forw=0xffffffffffffffff, list=0xffff800020afe008,0xffffffff8236fbe0 process=0xffff800020b7d180 user=0xffff800020bbe000, vmspace=0xfffffd807effe000 estcpu=12, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *84887 307047 5211 0 7 0 syz-executor7760 3092 79340 60010 0 7 0 syz-executor7760 3591 52504 0 0 3 0x14200 acct acct 60010 292771 79806 0 3 0x80 nanosleep syz-executor7760 5211 59744 79806 0 3 0x80 nanosleep syz-executor7760 79806 471208 93309 0 3 0x82 nanosleep syz-executor7760 93309 115215 35169 0 3 0x10008a pause ksh 35169 453254 44798 0 3 0x92 select sshd 27835 84376 1 0 3 0x100083 ttyin getty 44798 442806 1 0 3 0x80 select sshd 59938 160657 20544 74 3 0x100092 bpf pflogd 20544 458131 1 0 3 0x80 netio pflogd 43275 503730 75348 73 2 0x100090 syslogd 75348 354477 1 0 3 0x100082 netio syslogd 55480 396975 1 77 3 0x100090 poll dhclient 6226 429921 1 0 3 0x80 poll dhclient 65912 3220 0 0 3 0x14200 pgzero zerothread 16012 86214 0 0 3 0x14200 aiodoned aiodoned 13817 49093 0 0 3 0x14200 syncer update 77691 264412 0 0 3 0x14200 cleaner cleaner 65480 444097 0 0 3 0x14200 reaper reaper 13029 68349 0 0 3 0x14200 pgdaemon pagedaemon 62993 479602 0 0 3 0x14200 bored crynlk 62871 64701 0 0 3 0x14200 bored crypto 67644 376495 0 0 3 0x40014200 acpi0 acpi0 77362 139830 0 0 3 0x40014200 idle1 11434 508851 0 0 3 0x14200 bored softnet 69668 356425 0 0 3 0x14200 bored systqmp 54868 194131 0 0 3 0x14200 bored systq 9257 74611 0 0 3 0x40014200 bored softclock 20404 310548 0 0 3 0x40014200 idle0 96199 102066 0 0 3 0x14200 bored smr 1 49464 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 84887 (syz-executor7760) thread 0xffff800020afe9e8 (307047) exclusive rrwlock inode r = 0 (0xfffffd806d9ff3d8) #0 witness_lock+0x52e #1 rw_enter+0x46d #2 rrw_enter+0x4f #3 VOP_LOCK+0x4b #4 vn_close+0xb9 #5 sys_acct+0x15b #6 syscall+0x552 #7 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823822f8) #0 witness_lock+0x52e #1 __mp_acquire_count+0x51 #2 mi_switch+0x38f #3 sleep_finish+0x113 #4 rw_enter+0x366 #5 rrw_enter+0x4f #6 VOP_LOCK+0x4b #7 vn_close+0xb9 #8 sys_acct+0x15b #9 syscall+0x552 #10 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9452 6383K 6384K 78643K 10539 0 0 pcb 13 8K 8K 78643K 13 0 0 rtable 61 2K 2K 78643K 126 0 0 ifaddr 25 7K 7K 78643K 26 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 4K 78643K 1467 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 1 0K 0K 78643K 1 0 0 proc 52 50K 58K 78643K 334 0 0 NFS srvsock 1 0K 0K 78643K 1 0 0 NFS daemon 1 16K 16K 78643K 1 0 0 in_multi 11 0K 0K 78643K 11 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 179 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 66 3K 4K 78643K 825 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 4 0K 0K 78643K 4 0 0 temp 39 2732K 2796K 78643K 2004 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 2 0 0 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtpcb 80 15 0 13 1 0 1 1 0 8 0 rtentry 112 23 0 1 1 0 1 1 0 8 0 unpcb 120 29 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 280 29 0 23 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 8 0 2 1 0 1 1 0 8 0 pfstkey 112 8 0 2 1 0 1 1 0 8 0 pfstate 328 8 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 97 0 0 7 0 7 7 0 8 0 art_table 32 98 0 0 1 0 1 1 0 8 0 art_node 16 22 0 2 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino1pl 128 1414 0 25 45 0 45 45 0 8 0 ffsino 272 1414 0 25 93 0 93 93 0 8 0 nchpl 144 1613 0 63 58 0 58 58 0 8 0 uvmvnodes 72 1424 0 0 26 0 26 26 0 8 0 vnodes 200 1424 0 0 75 0 75 75 0 8 0 namei 1024 3805 0 3805 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2522 0 2522 8 7 1 6 0 8 1 plimitpl 152 14 0 8 1 0 1 1 0 8 0 sigapl 432 213 0 197 2 0 2 2 0 8 0 knotepl 112 5 0 0 1 0 1 1 0 8 0 kqueuepl 104 1 0 0 1 0 1 1 0 8 0 pipepl 112 134 0 127 2 1 1 1 0 8 0 fdescpl 488 214 0 197 3 0 3 3 0 8 0 filepl 152 993 0 944 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 48 3 0 3 1 1 0 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 52 0 43 1 0 1 1 0 8 0 zombiepl 144 197 0 197 2 1 1 1 0 8 1 processpl 896 230 0 197 4 0 4 4 0 8 0 procpl 632 230 0 197 3 0 3 3 0 8 0 sockpl 384 73 0 55 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 86 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 105 0 0 6 0 6 6 0 8 0 bufpl 256 2177 0 276 119 0 119 119 0 8 0 anonpl 16 20274 0 18988 7 1 6 7 0 125 0 amapchunkpl 152 545 0 504 2 0 2 2 0 158 0 amappl16 192 91 0 81 1 0 1 1 0 8 0 amappl14 176 38 0 34 1 0 1 1 0 8 0 amappl12 160 10 0 10 2 1 1 1 0 8 1 amappl11 152 51 0 36 1 0 1 1 0 8 0 amappl10 144 56 0 54 1 0 1 1 0 8 0 amappl9 136 426 0 425 1 0 1 1 0 8 0 amappl8 128 100 0 96 1 0 1 1 0 8 0 amappl7 120 21 0 20 1 0 1 1 0 8 0 amappl6 112 47 0 42 1 0 1 1 0 8 0 amappl5 104 145 0 129 1 0 1 1 0 8 0 amappl4 96 466 0 442 1 0 1 1 0 8 0 amappl3 88 158 0 147 1 0 1 1 0 8 0 amappl2 80 770 0 712 2 0 2 2 0 8 0 amappl1 72 13806 0 13375 15 5 10 15 0 8 0 amappl 80 429 0 404 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 dma64 64 259 0 259 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 24 214 0 197 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 214 0 197 1 0 1 1 0 8 0 vmmpekpl 168 5628 0 5607 2 0 2 2 0 8 0 vmmpepl 168 29589 0 28653 51 10 41 47 0 357 0 vmsppl 368 213 0 197 2 0 2 2 0 8 0 pdppl 4096 436 0 394 6 0 6 6 0 8 0 pvpl 32 80908 0 77796 32 4 28 28 0 265 1 pmappl 232 213 0 197 1 0 1 1 0 8 0 extentpl 40 41 0 26 1 0 1 1 0 8 0 phpool 112 254 0 4 8 0 8 8 0 8 0