kern.securelevel: 0 -> 1 creating runtime link editor directory cache. preserving editor files. starting network daemons: sshd. starting local daemons:. Thu Apr 11 05:06:00 PDT 2019 OpenBSD/amd64 (ci-openbsd-multicore-9.c.syzkaller.internal) (tty00) Warning: Permanently added '10.128.0.212' (ECDSA) to the list of known hosts. executing program login: witness: lock order reversal: 1st 0xfffffd806e8885c0 vmmaplk (&map->lock) @ /syzkaller/managers/multicore/kernel/sys/uvm/uvm_fault.c:1444 2nd 0xfffffd806dac20a0 inode (&ip->i_lock) @ /syzkaller/managers/multicore/kernel/sys/ufs/ufs/ufs_vnops.c:1547 lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x6cd #1 _rw_enter_read+0x80 #2 uvmfault_lookup+0xd9 #3 uvm_fault+0x7c #4 pageflttrap+0x217 #5 kerntrap+0xec #6 alltraps_kern+0x7b #7 copyout+0x53 #8 ffs_read+0x362 #9 VOP_READ+0x63 #10 vn_read+0x1c3 #11 dofilereadv+0x19f #12 sys_read+0x83 #13 syscall+0x576 #14 Xsyscall+0x128 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x6cd #1 _rw_enter+0xc6 #2 _rrw_enter+0x60 #3 VOP_LOCK+0x4b #4 vn_lock+0x6e #5 uvn_io+0x2c9 #6 uvn_get+0x226 #7 uvm_fault+0x1205 #8 uvm_fault_wire+0x70 #9 uvm_map_pageable_wire+0x31d #10 sys_mlock+0x18b #11 syscall+0x576 #12 Xsyscall+0x128 Stopped at db_enter+0x18: addq $0x8,%rsp ddb{0}> ddb{0}> set $lines = 0 ddb{0}> set $maxwidth = 0 ddb{0}> show panic the kernel did not panic ddb{0}> trace db_enter() at db_enter+0x18 witness_checkorder(fffffd806dac20a0,9,ffffffff81eee28c,60b,0) at witness_checkorder+0x12ff _rw_enter(fffffd806dac2090,81,ffffffff81eee28c,60b) at _rw_enter+0xc6 _rrw_enter(fffffd806dac2090,81,ffffffff81eee28c,60b) at _rrw_enter+0x60 VOP_LOCK(fffffd807eaa1580,81) at VOP_LOCK+0x4b vn_lock(fffffd807eaa1580,81) at vn_lock+0x6e uvn_io(fffffd806db1b1b8,ffff800020bc2ae8,1,2,0) at uvn_io+0x2c9 uvn_get(fffffd806db1b1b8,0,ffff800020bc2d40,ffff800020bc2cdc,0,1) at uvn_get+0x226 uvm_fault(fffffd806e8885a8,20002000,2,1) at uvm_fault+0x1205 uvm_fault_wire(fffffd806e8885a8,20002000,20003000,1) at uvm_fault_wire+0x70 uvm_map_pageable_wire(fffffd806e8885a8,fffffd807ecfba00,fffffd807ecfb2c8,0,0,0) at uvm_map_pageable_wire+0x31d sys_mlock(ffff800020b94718,ffff800020bc2f48,ffff800020bc2fb0) at sys_mlock+0x18b syscall(ffff800020bc3020) at syscall+0x576 Xsyscall(6,0,7f7ffffe3f88,0,1,7f7ffffe3f98) at Xsyscall+0x128 end of kernel end trace frame: 0x7f7ffffe3f70, count: -14 ddb{0}> show registers rdi 0x3 rsi 0xffffffff821a9b10 __sancov_gen_cov_switch_values.127 rbp 0xffff800020bc2720 rbx 0x3 rdx 0x8b rcx 0x3 rax 0x3 r8 0xffffffff819fa958 witness_checkorder+0x12d8 r9 0x5 r10 0x3a4633e44bdbcb6a r11 0xba04927c3dc0213f r12 0xffffffff81eee28c cmd0646_9_tim_udma+0x22a70 r13 0xfffffd80025e3c30 r14 0xffffffff822d9ac0 w_lodata+0x50650 r15 0xfffffd80025eb7f0 rip 0xffffffff81da1b48 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff800020bc2710 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{0}> show proc PROC (syz-executor1151) pid=504906 stat=onproc flags process=2 proc=0 pri=51, usrpri=51, nice=20 forw=0xffffffffffffffff, list=0xffff800020b94970,0xffffffff82322198 process=0xffff800020b4b708 user=0xffff800020bbe000, vmspace=0xfffffd806e8885a8 estcpu=1, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{0}> ps PID TID PPID UID S FLAGS WAIT COMMAND *90007 504906 35139 0 7 0x2 syz-executor1151 35139 218380 72275 0 3 0x10008a pause ksh 72275 179909 22827 0 3 0x92 select sshd 35117 518683 1 0 3 0x100083 ttyin getty 22827 345490 1 0 3 0x80 select sshd 85290 224205 20024 74 3 0x100092 bpf pflogd 20024 61361 1 0 3 0x80 netio pflogd 41753 134056 30735 73 7 0x100090 syslogd 30735 256168 1 0 3 0x100082 netio syslogd 25463 499995 1 77 3 0x100090 poll dhclient 14916 433766 1 0 3 0x80 poll dhclient 38713 403693 0 0 3 0x14200 pgzero zerothread 7769 237965 0 0 3 0x14200 aiodoned aiodoned 82646 42924 0 0 3 0x14200 syncer update 94581 15992 0 0 3 0x14200 cleaner cleaner 19042 302964 0 0 3 0x14200 reaper reaper 93169 225876 0 0 3 0x14200 pgdaemon pagedaemon 59825 437477 0 0 3 0x14200 bored crynlk 84743 223767 0 0 3 0x14200 bored crypto 38524 383136 0 0 3 0x40014200 acpi0 acpi0 68918 292725 0 0 3 0x40014200 idle1 51482 179388 0 0 3 0x14200 bored softnet 80556 487328 0 0 3 0x14200 bored systqmp 18768 259975 0 0 3 0x14200 bored systq 68385 157624 0 0 3 0x40014200 bored softclock 3370 176778 0 0 3 0x40014200 idle0 42115 45601 0 0 3 0x14200 bored smr 1 169630 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{0}> show all locks Process 90007 (syz-executor1151) thread 0xffff800020b94718 (504906) shared rwlock vmmaplk r = 0 (0xfffffd806e8885c0) locked @ /syzkaller/managers/multicore/kernel/sys/uvm/uvm_fault.c:1444 #0 witness_lock+0x5a4 #1 _rw_enter+0x43c #2 vm_map_lock_ln+0x164 #3 uvm_map_pageable+0x12b #4 sys_mlock+0x18b #5 syscall+0x576 #6 Xsyscall+0x128 exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8230bf78) locked @ /syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90 #0 witness_lock+0x5a4 #1 syscall+0x45e #2 Xsyscall+0x128 ddb{0}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim devbuf 9450 6382K 6383K 78643K 10537 0 0 pcb 25 9K 9K 78643K 57 0 0 rtable 61 2K 2K 78643K 125 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 1167 73K 73K 78643K 1172 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 52 50K 58K 78643K 279 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 53 3K 3K 78643K 765 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 2360K 2424K 78643K 1995 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 29 0 23 1 0 1 1 0 8 0 plimitpl 152 14 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 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 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 1391 0 17 45 0 45 45 0 8 0 ffsino 272 1391 0 17 92 0 92 92 0 8 0 nchpl 144 1564 0 32 57 0 57 57 0 8 0 uvmvnodes 72 1401 0 0 26 0 26 26 0 8 0 vnodes 200 1401 0 0 74 0 74 74 0 8 0 namei 1024 3550 0 3550 2 1 1 1 0 8 1 percpumem 16 30 0 0 1 0 1 1 0 8 0 scxspl 192 2446 0 2446 7 6 1 6 0 8 1 sigapl 432 205 0 193 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 3 2 1 1 0 8 0 fdescpl 488 206 0 193 3 0 3 3 0 8 0 filepl 152 961 0 913 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 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 144 193 0 193 3 2 1 1 0 8 1 processpl 840 221 0 193 4 0 4 4 0 8 0 procpl 600 221 0 193 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 72 0 0 9 0 9 9 0 8 0 mtagpl 80 1 0 0 1 0 1 1 0 8 0 mbufpl 256 98 0 0 5 0 5 5 0 8 0 bufpl 256 2133 0 271 117 0 117 117 0 8 0 anonpl 16 19072 0 17875 9 3 6 7 0 125 1 amapchunkpl 152 554 0 517 2 0 2 2 0 158 0 amappl16 192 115 0 110 1 0 1 1 0 8 0 amappl14 176 16 0 15 3 2 1 1 0 8 0 amappl12 160 7 0 7 2 1 1 1 0 8 1 amappl11 152 41 0 23 1 0 1 1 0 8 0 amappl10 144 58 0 55 1 0 1 1 0 8 0 amappl9 136 420 0 419 1 0 1 1 0 8 0 amappl8 128 98 0 94 1 0 1 1 0 8 0 amappl7 120 19 0 17 1 0 1 1 0 8 0 amappl6 112 43 0 39 1 0 1 1 0 8 0 amappl5 104 118 0 104 1 0 1 1 0 8 0 amappl4 96 455 0 429 1 0 1 1 0 8 0 amappl3 88 104 0 98 1 0 1 1 0 8 0 amappl2 80 636 0 597 1 0 1 1 0 8 0 amappl1 72 13565 0 13152 15 5 10 15 0 8 0 amappl 72 427 0 406 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 24 206 0 193 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 206 0 193 1 0 1 1 0 8 0 vmmpekpl 168 5575 0 5556 1 0 1 1 0 8 0 vmmpepl 168 27221 0 26462 49 13 36 45 0 357 2 vmsppl 360 205 0 193 2 0 2 2 0 8 0 pdppl 4096 419 0 386 5 0 5 5 0 8 0 pvpl 32 80126 0 77185 36 8 28 28 0 265 1 pmappl 232 205 0 193 1 0 1 1 0 8 0 extentpl 40 39 0 25 1 0 1 1 0 8 0 phpool 112 246 0 4 7 0 7 7 0 8 0