kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Mon Mar 25 15:52:56 PDT 2019 OpenBSD/amd64 (ci-openbsd-setuid-1.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.243' (ECDSA) to the list of known hosts. executing program login: panic: kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND *157034 9595 0 0x2 0 0K syz-executor1116 db_enter() at db_enter+0x18 panic() at panic+0x174 __assert(ffffffff81f7f998,ffffffff81f30b1c,36f,ffffffff81f8a837) at __assert+0x2e unveil_check_final(ffff800020b66268,ffff800020b973c8) at unveil_check_final+0x81d namei(ffff800020b973c8) at namei+0x88b domkdirat(ffff800020b66268,ffffff9c,20000040,2) at domkdirat+0x81 syscall(ffff800020b97680) at syscall+0x5b8 Xsyscall(6,0,7f7ffffe1f18,0,2f30656c69662f2e,30656c69662f30) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe1eb0, count: 7 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 kernel diagnostic assertion "tname->un_flags & UNVEIL_USERSET" failed: file "/syzkaller/managers/setuid/kernel/sys/kern/kern_unveil.c", line 879 ddb{0}> trace db_enter() at db_enter+0x18 panic() at panic+0x174 __assert(ffffffff81f7f998,ffffffff81f30b1c,36f,ffffffff81f8a837) at __assert+0x2e unveil_check_final(ffff800020b66268,ffff800020b973c8) at unveil_check_final+0x81d namei(ffff800020b973c8) at namei+0x88b domkdirat(ffff800020b66268,ffffff9c,20000040,2) at domkdirat+0x81 syscall(ffff800020b97680) at syscall+0x5b8 Xsyscall(6,0,7f7ffffe1f18,0,2f30656c69662f2e,30656c69662f30) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe1eb0, count: -8 ddb{0}> show registers rdi 0 rsi 0x1 rbp 0xffff800020b97170 rbx 0xffff800020b97220 rdx 0xffffffff81f24c5a cmd0646_9_tim_udma+0x19b76 rcx 0x201 rax 0x1 r8 0xffffffff81d729c3 kprintf+0x183 r9 0x1 r10 0x7e1a90856cd402e7 r11 0x8bf951044f817dc4 r12 0x3000000008 r13 0xffff800020b97180 r14 0x100 r15 0x1 rip 0xffffffff815e48a8 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020b97160 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1116) pid=157034 stat=onproc flags process=2 proc=0 pri=54, usrpri=54, nice=20 forw=0xffffffffffffffff, list=0xffff800020b66970,0xffffffff8235ded8 process=0xffff800020b7d080 user=0xffff800020b92000, vmspace=0xfffffd806e939cb0 estcpu=4, cpticks=1, pctcpu=0.0 user=0, sys=1, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND * 9595 157034 6134 0 7 0x2 syz-executor1116 6134 384725 58854 0 3 0x10008a pause ksh 58854 264937 85609 0 3 0x92 select sshd 7637 150863 1 0 3 0x100083 ttyin getty 85609 234174 1 0 3 0x80 select sshd 23214 391650 35394 73 3 0x100090 kqread syslogd 35394 289855 1 0 3 0x100082 netio syslogd 58831 381591 1 77 3 0x100090 poll dhclient 60270 4536 1 0 3 0x80 poll dhclient 91249 474677 0 0 3 0x14200 pgzero zerothread 41894 258559 0 0 3 0x14200 aiodoned aiodoned 32246 277948 0 0 3 0x14200 syncer update 26074 104221 0 0 3 0x14200 cleaner cleaner 46591 244531 0 0 3 0x14200 reaper reaper 92429 15491 0 0 3 0x14200 pgdaemon pagedaemon 97559 161510 0 0 3 0x14200 bored crynlk 21485 482198 0 0 3 0x14200 bored crypto 92588 219615 0 0 3 0x40014200 acpi0 acpi0 74785 124966 0 0 7 0x40014200 idle1 40974 133258 0 0 3 0x14200 bored softnet 22463 168625 0 0 3 0x14200 bored systqmp 93972 184772 0 0 3 0x14200 bored systq 79276 37036 0 0 3 0x40014200 bored softclock 44706 401757 0 0 3 0x40014200 idle0 61751 395705 0 0 3 0x14200 bored smr 1 378792 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 9595 (syz-executor1116) thread 0xffff800020b66268 (157034) exclusive rrwlock inode r = 0 (0xfffffd807c695f80) locked @ /syzkaller/managers/setuid/kernel/sys/ufs/ufs/ufs_vnops.c:1547 #0 witness_lock+0x594 #1 _rw_enter+0x45d #2 _rrw_enter+0x60 #3 VOP_LOCK+0x57 #4 vn_lock+0x6e #5 vget+0x1c3 #6 cache_lookup+0x300 #7 ufs_lookup+0x1d7 #8 VOP_LOOKUP+0x67 #9 vfs_lookup+0x556 #10 namei+0x4b2 #11 domkdirat+0x81 #12 syscall+0x5b8 #13 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8236d8b0) locked @ /syzkaller/managers/setuid/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x594 #1 syscall+0x48b #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9442 6315K 6316K 78643K 10529 0 0 pcb 23 9K 9K 78643K 55 0 0 rtable 61 2K 2K 78643K 115 0 0 ifaddr 21 7K 7K 78643K 21 0 0 counters 39 33K 33K 78643K 39 0 0 ioctlops 0 0K 2K 78643K 13 0 0 mount 1 1K 1K 78643K 1 0 0 vnodes 1166 73K 73K 78643K 1171 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 12628 0 0 file desc 1 0K 0K 78643K 1 0 0 proc 43 50K 58K 78643K 211 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 152 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 47 2K 3K 78643K 659 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 3 0K 0K 78643K 3 0 0 temp 30 2359K 2423K 78643K 1718 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 inpcbpl 280 22 0 16 1 0 1 1 0 8 0 plimitpl 152 13 0 8 1 0 1 1 0 8 0 plcache 128 20 0 0 1 0 1 1 0 8 0 rtentry 112 23 0 1 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 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 96 0 0 6 0 6 6 0 8 0 art_table 32 97 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 1382 0 16 45 0 45 45 0 8 0 ffsino 272 1382 0 16 92 0 92 92 0 8 0 nchpl 144 1556 0 30 57 0 57 57 0 8 0 uvmvnodes 72 1391 0 0 26 0 26 26 0 8 0 vnodes 200 1391 0 0 74 0 74 74 0 8 0 namei 1024 3286 0 3285 3 2 1 1 0 8 0 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2375 0 2375 7 6 1 6 0 8 1 sigapl 432 176 0 166 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 112 118 0 111 3 2 1 1 0 8 0 fdescpl 488 177 0 166 2 0 2 2 0 8 0 filepl 152 817 0 775 2 0 2 2 0 8 0 lockfpl 104 6 0 6 1 1 0 1 0 8 0 lockfspl 32 3 0 3 1 1 0 1 0 8 0 sessionpl 112 17 0 9 1 0 1 1 0 8 0 pgrppl 48 17 0 9 1 0 1 1 0 8 0 ucredpl 96 47 0 40 1 0 1 1 0 8 0 zombiepl 144 166 0 166 3 2 1 1 0 8 1 processpl 840 192 0 166 4 0 4 4 0 8 0 procpl 600 192 0 166 3 0 3 3 0 8 0 sockpl 384 64 0 48 2 0 2 2 0 8 0 mcl4k 4096 3 0 0 1 0 1 1 0 8 0 mcl2k 2048 72 0 0 8 0 8 8 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 90 0 0 5 0 5 5 0 8 0 bufpl 256 2052 0 254 113 0 113 113 0 8 0 anonpl 16 16937 0 15838 6 1 5 6 0 125 0 amapchunkpl 152 491 0 456 2 0 2 2 0 158 0 amappl16 192 27 0 25 1 0 1 1 0 8 0 amappl15 184 44 0 40 1 0 1 1 0 8 0 amappl14 176 14 0 13 3 2 1 1 0 8 0 amappl13 168 22 0 19 1 0 1 1 0 8 0 amappl12 160 12 0 12 2 1 1 1 0 8 1 amappl11 152 21 0 10 1 0 1 1 0 8 0 amappl10 144 47 0 46 1 0 1 1 0 8 0 amappl9 136 380 0 379 1 0 1 1 0 8 0 amappl8 128 87 0 82 1 0 1 1 0 8 0 amappl7 120 15 0 14 1 0 1 1 0 8 0 amappl6 112 41 0 37 1 0 1 1 0 8 0 amappl5 104 115 0 105 1 0 1 1 0 8 0 amappl4 96 357 0 335 1 0 1 1 0 8 0 amappl3 88 104 0 99 1 0 1 1 0 8 0 amappl2 80 561 0 526 1 0 1 1 0 8 0 amappl1 72 11778 0 11393 15 5 10 15 0 8 0 amappl 72 369 0 350 1 0 1 1 0 75 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 24 177 0 166 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 177 0 166 1 0 1 1 0 8 0 vmmpekpl 168 5258 0 5239 1 0 1 1 0 8 0 vmmpepl 168 23624 0 22936 54 20 34 43 0 357 3 vmsppl 360 176 0 166 2 0 2 2 0 8 0 pdppl 4096 362 0 332 5 0 5 5 0 8 0 pvpl 32 72012 0 69211 40 13 27 27 0 265 3 pmappl 224 176 0 166 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 240 0 4 7 0 7 7 0 8 0 ddb{0}>