witness: reversal: vmmaplk inode (2)
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syzbot
Dec 18, 2019, 2:24:10 PM12/18/19
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: bcf611cd Set vm_map's pmap in uvm_map_setup().
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16cbca8ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=06cee7cfc759eb863aa2
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+06cee7...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xfffffd807f007b98 vmmaplk (&map->lock)
2nd 0xfffffd80643790a0 inode (&ip->i_lock)
lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at:
#0 witness_checkorder+0x69c witness_lock_order_check
sys/kern/subr_witness.c:2441 [inline]
#0 witness_checkorder+0x69c sys/kern/subr_witness.c:872
#1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:109
#2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448
#3 uvm_fault+0x7f sys/uvm/uvm_fault.c:524
#4 pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199
#5 kerntrap+0xec sys/arch/amd64/amd64/trap.c:287
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#8 ffs_read+0x362 sys/ufs/ffs/ffs_vnops.c:254
#9 VOP_READ+0xbf sys/kern/vfs_vops.c:248
#10 vn_read+0x124 sys/kern/vfs_vnops.c:375
#11 dofilereadv+0x1a2 sys/kern/sys_generic.c:236
#12 sys_read+0x83 sys/kern/sys_generic.c:156
#13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#14 Xsyscall+0x128
lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at:
#0 witness_checkorder+0x69c witness_lock_order_check
sys/kern/subr_witness.c:2441 [inline]
#0 witness_checkorder+0x69c sys/kern/subr_witness.c:872
#1 rw_enter+0xd4
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453
#3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189
#6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1049
#7 uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023
#8 uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295
#9 uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358
#10 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
#11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#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 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(fffffd80643790a0,9,0) at witness_checkorder+0x1009
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(fffffd80643790a0,9,0) at witness_checkorder+0x1009
sys/kern/subr_witness.c:1086
rw_enter(fffffd8064379090,81) at rw_enter+0xd4
rrw_enter(fffffd8064379090,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453
VOP_LOCK(fffffd8077650000,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
vn_lock(fffffd8077650000,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571
uvn_io(fffffd80741c8918,ffff800024fbb5b8,1,2,0) at uvn_io+0x2c8
sys/uvm/uvm_vnode.c:1189
uvn_get(fffffd80741c8918,0,ffff800024fbb810,ffff800024fbb7a4,0,1) at
uvn_get+0x226 sys/uvm/uvm_vnode.c:1049
uvm_fault(fffffd807f007b80,20002000,2,1) at uvm_fault+0x11cc
sys/uvm/uvm_fault.c:1023
uvm_fault_wire(fffffd807f007b80,20002000,20005000,1) at uvm_fault_wire+0x70
sys/uvm/uvm_fault.c:1295
uvm_map_pageable_wire(fffffd807f007b80,fffffd806f32c268,fffffd806f32caf0,ffff800022d4c000,0,0)
at
uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358
sys_mlock(ffff800020a998c8,ffff800024fbba08,ffff800024fbba50) at
sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
syscall(ffff800024fbbad0) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800024fbbad0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xaaedec55b00, count: -14
ddb{0}> show registers
rdi 0x3
rsi 0x3ffff acpi_pdirpa+0x2be67
rbp 0xffff800024fbb230
rbx 0x3
rdx 0x40000 acpi_pdirpa+0x2be68
rcx 0xffff800022d4c000
rax 0xffff8000009f8700
r8 0xffffffff81ad1322 witness_checkorder+0xfe2
r9 0x5
r10 0x3
r11 0xd09eac2c775e322
r12 0xfffffd800297f240
r13 0
r14 0xffffffff825c8260 w_lodata+0x41500
r15 0xffffffff825dae20 w_lodata+0x540c0
rip 0xffffffff8129eb48 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800024fbb220
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=481562 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=81, usrpri=81, nice=20
forw=0xffffffffffffffff, list=0xffff800020a989f8,0xffffffff8260dd10
process=0xffff800020a9b540 user=0xffff800024fb6000,
vmspace=0xfffffd807f007b80
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
58858 131660 99586 32767 7 0x10 syz-executor.1
*58858 481562 99586 32767 7 0x4000010 syz-executor.1
3578 66325 32927 32767 3 0x90 nanosleep syz-executor.0
3578 413737 32927 32767 3 0x4000090 kqread syz-executor.0
3578 165578 32927 32767 3 0x4000090 kqread syz-executor.0
3578 517332 32927 32767 3 0x4000090 kqread syz-executor.0
3578 505720 32927 32767 3 0x4000090 kqread syz-executor.0
3578 79952 32927 32767 3 0x4000090 fsleep syz-executor.0
32927 291635 25440 32767 3 0x90 nanosleep syz-executor.0
25440 131573 16122 0 3 0x82 wait syz-executor.0
99586 267634 88023 32767 3 0x90 nanosleep syz-executor.1
88023 378174 16122 0 3 0x82 wait syz-executor.1
53187 87683 0 0 3 0x14200 bored sosplice
16122 93603 18044 0 3 0x82 thrsleep syz-fuzzer
16122 457826 18044 0 3 0x4000082 nanosleep syz-fuzzer
16122 176884 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 4109 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 9988 18044 0 3 0x4000082 kqread syz-fuzzer
16122 477980 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 40147 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 372948 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 42540 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 332017 18044 0 3 0x4000082 thrsleep syz-fuzzer
18044 475068 93072 0 3 0x10008a pause ksh
93072 513315 66549 0 3 0x92 select sshd
50628 371305 1 0 3 0x100083 ttyin getty
66549 447163 1 0 3 0x80 select sshd
84733 420537 7527 73 3 0x100090 kqread syslogd
7527 30805 1 0 3 0x100082 netio syslogd
43051 72262 1 77 3 0x100090 poll dhclient
14989 90129 1 0 3 0x80 poll dhclient
95195 318712 0 0 3 0x14200 pgzero zerothread
54852 436385 0 0 3 0x14200 aiodoned aiodoned
19329 430843 0 0 3 0x14200 syncer update
46476 249232 0 0 3 0x14200 cleaner cleaner
2835 419987 0 0 3 0x14200 reaper reaper
2211 41937 0 0 3 0x14200 pgdaemon pagedaemon
50843 127999 0 0 3 0x14200 bored crynlk
23867 38875 0 0 3 0x14200 bored crypto
31296 81435 0 0 3 0x40014200 acpi0 acpi0
94260 435881 0 0 3 0x40014200 idle1
14036 177724 0 0 3 0x14200 bored softnet
14502 292228 0 0 3 0x14200 bored systqmp
71523 187067 0 0 3 0x14200 bored systq
2474 430697 0 0 3 0x40014200 bored softclock
69490 123487 0 0 3 0x40014200 idle0
30443 23668 0 0 3 0x14200 bored smr
1 6888 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 58858 (syz-executor.1) thread 0xffff800020a998c8 (481562)
shared rwlock vmmaplk r = 0 (0xfffffd807f007b98)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5409
#3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2454
#4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82650348)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9483 6334K 6334K 78643K 10979 0
pcb 13 14K 18K 78643K 17 0
rtable 105 3K 3K 78643K 4818 0
ifaddr 39 11K 12K 78643K 778 0
counters 39 33K 33K 78643K 39 0
ioctlops 0 0K 2K 78643K 252 0
iov 0 0K 48K 78643K 1513 0
mount 1 1K 1K 78643K 1 0
vnodes 1214 76K 76K 78643K 3529 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 56 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 143 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 8 25K 33K 78643K 6633 0
sigio 0 0K 0K 78643K 409 0
proc 48 50K 83K 78643K 6010 0
subproc 34 2K 2K 78643K 1751 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 787 0
in_multi 33 2K 2K 78643K 1229 0
ether_multi 1 0K 0K 78643K 29 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 138 609K 609K 78643K 138 0
exec 0 0K 1K 78643K 2149 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 155 33K 38K 78643K 21868 0
UVM aobj 130 4K 4K 78643K 130 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 1K 78643K 756 0
NDP 5 0K 0K 78643K 312 0
temp 106 3038K 3124K 78643K 29042 0
kqueue 0 0K 0K 78643K 253 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 213 0 207 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 958 0 956 1 0 1 1 0
8 0
rtentry 112 1060 0 1016 2 0 2 2 0
8 0
unpcb 120 4864 0 4835 11 9 2 2 0
8 1
syncache 264 75 0 75 14 14 0 1 0
8 0
tcpqe 32 42 0 42 12 12 0 1 0
8 0
tcpcb 544 3547 0 3542 24 21 3 14 0
8 2
ipq 40 30 0 30 9 8 1 1 0
8 1
ipqe 40 1189 0 1189 9 8 1 1 0
8 1
inpcb 280 7433 0 7424 35 31 4 15 0
8 3
ip6q 72 2 0 2 1 1 0 1 0
8 0
ip6af 40 6 0 6 1 1 0 1 0
8 0
nd6 48 206 0 202 1 0 1 1 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 4756 0 4541 14 0 14 14 0
8 0
art_table 32 4757 0 4541 2 0 2 2 0
8 0
art_node 16 1059 0 1019 1 0 1 1 0
8 0
sysvmsgpl 40 101 0 101 1 1 0 1 0
8 0
semupl 112 6 0 6 1 1 0 1 0
8 0
semapl 112 141 0 131 1 0 1 1 0
8 0
shmpl 112 128 0 0 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 8704 0 7284 46 0 46 46 0
8 0
ffsino 272 8704 0 7284 96 1 95 96 0
8 0
nchpl 144 18753 0 17120 61 0 61 61 0
8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0
8 0
vnodes 208 5926 0 0 312 0 312 312 0
8 0
namei 1024 83468 0 83468 2 1 1 2 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 52581 0 52581 39 38 1 7 0
8 1
plimitpl 152 905 0 896 1 0 1 1 0
8 0
sigapl 432 6501 0 6485 7 5 2 3 0
8 0
futexpl 56 119987 0 119986 1 0 1 1 0
8 0
knotepl 112 2421 0 2402 8 6 2 2 0
8 1
kqueuepl 104 4225 0 4218 14 13 1 6 0
8 0
pipepl 160 4120 0 4101 20 18 2 2 0
8 1
fdescpl 488 6502 0 6485 3 0 3 3 0
8 0
filepl 152 60982 0 60873 67 61 6 20 0
8 1
lockfpl 104 1918 0 1917 1 0 1 1 0
8 0
lockfspl 48 535 0 534 1 0 1 1 0
8 0
sessionpl 112 118 0 108 1 0 1 1 0
8 0
pgrppl 48 183 0 173 1 0 1 1 0
8 0
ucredpl 96 13402 0 13393 1 0 1 1 0
8 0
zombiepl 144 6485 0 6485 2 1 1 1 0
8 1
processpl 904 6518 0 6485 4 0 4 4 0
8 0
procpl 632 16228 0 16180 17 12 5 5 0
8 1
srpgc 64 202 0 202 19 18 1 1 0
8 1
sosppl 128 245 0 245 16 15 1 1 0
8 1
sockpl 384 13402 0 13362 57 48 9 24 0
8 4
mcl64k 65536 35 0 0 3 0 3 3 0
8 0
mcl16k 16384 35 0 0 4 1 3 3 0
8 0
mcl12k 12288 17 0 0 2 0 2 2 0
8 0
mcl9k 9216 17 0 0 2 0 2 2 0
8 0
mcl8k 8192 17 0 0 3 0 3 3 0
8 0
mcl4k 4096 41 0 0 5 2 3 3 0
8 0
mcl2k2 2112 8 0 0 1 0 1 1 0
8 0
mcl2k 2048 453 0 0 17 3 14 17 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 803 0 0 46 1 45 45 0
8 0
bufpl 280 175675 0 168609 506 0 506 506 0
8 0
anonpl 16 1790685 0 1780960 120 74 46 61 0
125 0
amapchunkpl 152 53763 0 53534 59 47 12 12 0
158 3
amappl16 192 95335 0 94956 164 143 21 41 0
8 1
amappl15 184 647 0 644 1 0 1 1 0
8 0
amappl14 176 2157 0 2151 2 1 1 1 0
8 0
amappl13 168 244 0 242 7 6 1 1 0
8 0
amappl12 160 555 0 551 1 0 1 1 0
8 0
amappl11 152 1544 0 1532 1 0 1 1 0
8 0
amappl10 144 929 0 926 1 0 1 1 0
8 0
amappl9 136 2381 0 2375 1 0 1 1 0
8 0
amappl8 128 1607 0 1532 4 1 3 3 0
8 0
amappl7 120 1622 0 1607 1 0 1 1 0
8 0
amappl6 112 1341 0 1326 1 0 1 1 0
8 0
amappl5 104 1518 0 1507 1 0 1 1 0
8 0
amappl4 96 6434 0 6405 1 0 1 1 0
8 0
amappl3 88 2074 0 2059 1 0 1 1 0
8 0
amappl2 80 44027 0 43943 4 2 2 3 0
8 0
amappl1 72 171312 0 170829 26 16 10 20 0
8 0
amappl 80 18414 0 18370 2 0 2 2 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 64 129 0 0 3 0 3 3 0
8 0
uaddrrnd 24 6502 0 6485 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 6502 0 6485 1 0 1 1 0
8 0
vmmpekpl 168 52765 0 52733 2 0 2 2 0
8 0
vmmpepl 168 876381 0 874573 174 90 84 96 0
357 0
vmsppl 368 6501 0 6485 2 0 2 2 0
8 0
pdppl 4096 13011 0 12970 6 0 6 6 0
8 0
pvpl 32 3454199 0 3440494 321 202 119 155 0
265 0
pmappl 232 6501 0 6485 10 9 1 2 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 232 0 32 7 0 7 7 0
8 0
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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syzbot found the following crash on:
HEAD commit: bcf611cd Set vm_map's pmap in uvm_map_setup().
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16cbca8ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=06cee7cfc759eb863aa2
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+06cee7...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xfffffd807f007b98 vmmaplk (&map->lock)
2nd 0xfffffd80643790a0 inode (&ip->i_lock)
lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at:
#0 witness_checkorder+0x69c witness_lock_order_check
sys/kern/subr_witness.c:2441 [inline]
#0 witness_checkorder+0x69c sys/kern/subr_witness.c:872
#1 rw_enter_read+0x66 sys/kern/kern_rwlock.c:109
#2 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448
#3 uvm_fault+0x7f sys/uvm/uvm_fault.c:524
#4 pageflttrap+0x20b sys/arch/amd64/amd64/trap.c:199
#5 kerntrap+0xec sys/arch/amd64/amd64/trap.c:287
#6 alltraps_kern_meltdown+0x7b
#7 copyout+0x53
#8 ffs_read+0x362 sys/ufs/ffs/ffs_vnops.c:254
#9 VOP_READ+0xbf sys/kern/vfs_vops.c:248
#10 vn_read+0x124 sys/kern/vfs_vnops.c:375
#11 dofilereadv+0x1a2 sys/kern/sys_generic.c:236
#12 sys_read+0x83 sys/kern/sys_generic.c:156
#13 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#13 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#14 Xsyscall+0x128
lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at:
#0 witness_checkorder+0x69c witness_lock_order_check
sys/kern/subr_witness.c:2441 [inline]
#0 witness_checkorder+0x69c sys/kern/subr_witness.c:872
#1 rw_enter+0xd4
#2 rrw_enter+0x88 sys/kern/kern_rwlock.c:453
#3 VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
#4 vn_lock+0x81 sys/kern/vfs_vnops.c:571
#5 uvn_io+0x2c8 sys/uvm/uvm_vnode.c:1189
#6 uvn_get+0x226 sys/uvm/uvm_vnode.c:1049
#7 uvm_fault+0x11cc sys/uvm/uvm_fault.c:1023
#8 uvm_fault_wire+0x70 sys/uvm/uvm_fault.c:1295
#9 uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358
#10 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
#11 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#11 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#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 sys/arch/amd64/amd64/db_interface.c:398
witness_checkorder(fffffd80643790a0,9,0) at witness_checkorder+0x1009
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(fffffd80643790a0,9,0) at witness_checkorder+0x1009
sys/kern/subr_witness.c:1086
rw_enter(fffffd8064379090,81) at rw_enter+0xd4
rrw_enter(fffffd8064379090,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453
VOP_LOCK(fffffd8077650000,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
vn_lock(fffffd8077650000,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571
uvn_io(fffffd80741c8918,ffff800024fbb5b8,1,2,0) at uvn_io+0x2c8
sys/uvm/uvm_vnode.c:1189
uvn_get(fffffd80741c8918,0,ffff800024fbb810,ffff800024fbb7a4,0,1) at
uvn_get+0x226 sys/uvm/uvm_vnode.c:1049
uvm_fault(fffffd807f007b80,20002000,2,1) at uvm_fault+0x11cc
sys/uvm/uvm_fault.c:1023
uvm_fault_wire(fffffd807f007b80,20002000,20005000,1) at uvm_fault_wire+0x70
sys/uvm/uvm_fault.c:1295
uvm_map_pageable_wire(fffffd807f007b80,fffffd806f32c268,fffffd806f32caf0,ffff800022d4c000,0,0)
at
uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358
sys_mlock(ffff800020a998c8,ffff800024fbba08,ffff800024fbba50) at
sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
syscall(ffff800024fbbad0) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800024fbbad0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xaaedec55b00, count: -14
ddb{0}> show registers
rdi 0x3
rsi 0x3ffff acpi_pdirpa+0x2be67
rbp 0xffff800024fbb230
rbx 0x3
rdx 0x40000 acpi_pdirpa+0x2be68
rcx 0xffff800022d4c000
rax 0xffff8000009f8700
r8 0xffffffff81ad1322 witness_checkorder+0xfe2
r9 0x5
r10 0x3
r11 0xd09eac2c775e322
r12 0xfffffd800297f240
r13 0
r14 0xffffffff825c8260 w_lodata+0x41500
r15 0xffffffff825dae20 w_lodata+0x540c0
rip 0xffffffff8129eb48 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800024fbb220
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=481562 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
pri=81, usrpri=81, nice=20
forw=0xffffffffffffffff, list=0xffff800020a989f8,0xffffffff8260dd10
process=0xffff800020a9b540 user=0xffff800024fb6000,
vmspace=0xfffffd807f007b80
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
58858 131660 99586 32767 7 0x10 syz-executor.1
*58858 481562 99586 32767 7 0x4000010 syz-executor.1
3578 66325 32927 32767 3 0x90 nanosleep syz-executor.0
3578 413737 32927 32767 3 0x4000090 kqread syz-executor.0
3578 165578 32927 32767 3 0x4000090 kqread syz-executor.0
3578 517332 32927 32767 3 0x4000090 kqread syz-executor.0
3578 505720 32927 32767 3 0x4000090 kqread syz-executor.0
3578 79952 32927 32767 3 0x4000090 fsleep syz-executor.0
32927 291635 25440 32767 3 0x90 nanosleep syz-executor.0
25440 131573 16122 0 3 0x82 wait syz-executor.0
99586 267634 88023 32767 3 0x90 nanosleep syz-executor.1
88023 378174 16122 0 3 0x82 wait syz-executor.1
53187 87683 0 0 3 0x14200 bored sosplice
16122 93603 18044 0 3 0x82 thrsleep syz-fuzzer
16122 457826 18044 0 3 0x4000082 nanosleep syz-fuzzer
16122 176884 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 4109 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 9988 18044 0 3 0x4000082 kqread syz-fuzzer
16122 477980 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 40147 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 372948 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 42540 18044 0 3 0x4000082 thrsleep syz-fuzzer
16122 332017 18044 0 3 0x4000082 thrsleep syz-fuzzer
18044 475068 93072 0 3 0x10008a pause ksh
93072 513315 66549 0 3 0x92 select sshd
50628 371305 1 0 3 0x100083 ttyin getty
66549 447163 1 0 3 0x80 select sshd
84733 420537 7527 73 3 0x100090 kqread syslogd
7527 30805 1 0 3 0x100082 netio syslogd
43051 72262 1 77 3 0x100090 poll dhclient
14989 90129 1 0 3 0x80 poll dhclient
95195 318712 0 0 3 0x14200 pgzero zerothread
54852 436385 0 0 3 0x14200 aiodoned aiodoned
19329 430843 0 0 3 0x14200 syncer update
46476 249232 0 0 3 0x14200 cleaner cleaner
2835 419987 0 0 3 0x14200 reaper reaper
2211 41937 0 0 3 0x14200 pgdaemon pagedaemon
50843 127999 0 0 3 0x14200 bored crynlk
23867 38875 0 0 3 0x14200 bored crypto
31296 81435 0 0 3 0x40014200 acpi0 acpi0
94260 435881 0 0 3 0x40014200 idle1
14036 177724 0 0 3 0x14200 bored softnet
14502 292228 0 0 3 0x14200 bored systqmp
71523 187067 0 0 3 0x14200 bored systq
2474 430697 0 0 3 0x40014200 bored softclock
69490 123487 0 0 3 0x40014200 idle0
30443 23668 0 0 3 0x14200 bored smr
1 6888 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 58858 (syz-executor.1) thread 0xffff800020a998c8 (481562)
shared rwlock vmmaplk r = 0 (0xfffffd807f007b98)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5409
#3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2454
#4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82650348)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9483 6334K 6334K 78643K 10979 0
pcb 13 14K 18K 78643K 17 0
rtable 105 3K 3K 78643K 4818 0
ifaddr 39 11K 12K 78643K 778 0
counters 39 33K 33K 78643K 39 0
ioctlops 0 0K 2K 78643K 252 0
iov 0 0K 48K 78643K 1513 0
mount 1 1K 1K 78643K 1 0
vnodes 1214 76K 76K 78643K 3529 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 56 0
VM map 2 1K 1K 78643K 2 0
sem 12 1K 1K 78643K 143 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 8 25K 33K 78643K 6633 0
sigio 0 0K 0K 78643K 409 0
proc 48 50K 83K 78643K 6010 0
subproc 34 2K 2K 78643K 1751 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 787 0
in_multi 33 2K 2K 78643K 1229 0
ether_multi 1 0K 0K 78643K 29 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 138 609K 609K 78643K 138 0
exec 0 0K 1K 78643K 2149 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 155 33K 38K 78643K 21868 0
UVM aobj 130 4K 4K 78643K 130 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 1K 78643K 756 0
NDP 5 0K 0K 78643K 312 0
temp 106 3038K 3124K 78643K 29042 0
kqueue 0 0K 0K 78643K 253 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
arp 64 213 0 207 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 958 0 956 1 0 1 1 0
8 0
rtentry 112 1060 0 1016 2 0 2 2 0
8 0
unpcb 120 4864 0 4835 11 9 2 2 0
8 1
syncache 264 75 0 75 14 14 0 1 0
8 0
tcpqe 32 42 0 42 12 12 0 1 0
8 0
tcpcb 544 3547 0 3542 24 21 3 14 0
8 2
ipq 40 30 0 30 9 8 1 1 0
8 1
ipqe 40 1189 0 1189 9 8 1 1 0
8 1
inpcb 280 7433 0 7424 35 31 4 15 0
8 3
ip6q 72 2 0 2 1 1 0 1 0
8 0
ip6af 40 6 0 6 1 1 0 1 0
8 0
nd6 48 206 0 202 1 0 1 1 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 4756 0 4541 14 0 14 14 0
8 0
art_table 32 4757 0 4541 2 0 2 2 0
8 0
art_node 16 1059 0 1019 1 0 1 1 0
8 0
sysvmsgpl 40 101 0 101 1 1 0 1 0
8 0
semupl 112 6 0 6 1 1 0 1 0
8 0
semapl 112 141 0 131 1 0 1 1 0
8 0
shmpl 112 128 0 0 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 8704 0 7284 46 0 46 46 0
8 0
ffsino 272 8704 0 7284 96 1 95 96 0
8 0
nchpl 144 18753 0 17120 61 0 61 61 0
8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0
8 0
vnodes 208 5926 0 0 312 0 312 312 0
8 0
namei 1024 83468 0 83468 2 1 1 2 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 52581 0 52581 39 38 1 7 0
8 1
plimitpl 152 905 0 896 1 0 1 1 0
8 0
sigapl 432 6501 0 6485 7 5 2 3 0
8 0
futexpl 56 119987 0 119986 1 0 1 1 0
8 0
knotepl 112 2421 0 2402 8 6 2 2 0
8 1
kqueuepl 104 4225 0 4218 14 13 1 6 0
8 0
pipepl 160 4120 0 4101 20 18 2 2 0
8 1
fdescpl 488 6502 0 6485 3 0 3 3 0
8 0
filepl 152 60982 0 60873 67 61 6 20 0
8 1
lockfpl 104 1918 0 1917 1 0 1 1 0
8 0
lockfspl 48 535 0 534 1 0 1 1 0
8 0
sessionpl 112 118 0 108 1 0 1 1 0
8 0
pgrppl 48 183 0 173 1 0 1 1 0
8 0
ucredpl 96 13402 0 13393 1 0 1 1 0
8 0
zombiepl 144 6485 0 6485 2 1 1 1 0
8 1
processpl 904 6518 0 6485 4 0 4 4 0
8 0
procpl 632 16228 0 16180 17 12 5 5 0
8 1
srpgc 64 202 0 202 19 18 1 1 0
8 1
sosppl 128 245 0 245 16 15 1 1 0
8 1
sockpl 384 13402 0 13362 57 48 9 24 0
8 4
mcl64k 65536 35 0 0 3 0 3 3 0
8 0
mcl16k 16384 35 0 0 4 1 3 3 0
8 0
mcl12k 12288 17 0 0 2 0 2 2 0
8 0
mcl9k 9216 17 0 0 2 0 2 2 0
8 0
mcl8k 8192 17 0 0 3 0 3 3 0
8 0
mcl4k 4096 41 0 0 5 2 3 3 0
8 0
mcl2k2 2112 8 0 0 1 0 1 1 0
8 0
mcl2k 2048 453 0 0 17 3 14 17 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 803 0 0 46 1 45 45 0
8 0
bufpl 280 175675 0 168609 506 0 506 506 0
8 0
anonpl 16 1790685 0 1780960 120 74 46 61 0
125 0
amapchunkpl 152 53763 0 53534 59 47 12 12 0
158 3
amappl16 192 95335 0 94956 164 143 21 41 0
8 1
amappl15 184 647 0 644 1 0 1 1 0
8 0
amappl14 176 2157 0 2151 2 1 1 1 0
8 0
amappl13 168 244 0 242 7 6 1 1 0
8 0
amappl12 160 555 0 551 1 0 1 1 0
8 0
amappl11 152 1544 0 1532 1 0 1 1 0
8 0
amappl10 144 929 0 926 1 0 1 1 0
8 0
amappl9 136 2381 0 2375 1 0 1 1 0
8 0
amappl8 128 1607 0 1532 4 1 3 3 0
8 0
amappl7 120 1622 0 1607 1 0 1 1 0
8 0
amappl6 112 1341 0 1326 1 0 1 1 0
8 0
amappl5 104 1518 0 1507 1 0 1 1 0
8 0
amappl4 96 6434 0 6405 1 0 1 1 0
8 0
amappl3 88 2074 0 2059 1 0 1 1 0
8 0
amappl2 80 44027 0 43943 4 2 2 3 0
8 0
amappl1 72 171312 0 170829 26 16 10 20 0
8 0
amappl 80 18414 0 18370 2 0 2 2 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 64 129 0 0 3 0 3 3 0
8 0
uaddrrnd 24 6502 0 6485 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 6502 0 6485 1 0 1 1 0
8 0
vmmpekpl 168 52765 0 52733 2 0 2 2 0
8 0
vmmpepl 168 876381 0 874573 174 90 84 96 0
357 0
vmsppl 368 6501 0 6485 2 0 2 2 0
8 0
pdppl 4096 13011 0 12970 6 0 6 6 0
8 0
pvpl 32 3454199 0 3440494 321 202 119 155 0
265 0
pmappl 232 6501 0 6485 10 9 1 2 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 232 0 32 7 0 7 7 0
8 0
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Dec 18, 2019, 3:25:10 PM12/18/19
to syzkaller-o...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: bcf611cd Set vm_map's pmap in uvm_map_setup().
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=15a798b9e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c5eb61e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+06cee7...@syzkaller.appspotmail.com
witness: lock order reversal:
1st 0xfffffd806e8bf8c0 vmmaplk (&map->lock)
2nd 0xfffffd806e3d0920 inode (&ip->i_lock)
witness_checkorder(fffffd806e3d0920,9,0) at witness_checkorder+0x1009
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(fffffd806e3d0920,9,0) at witness_checkorder+0x1009
sys/kern/subr_witness.c:1086
rw_enter(fffffd806e3d0910,81) at rw_enter+0xd4
rrw_enter(fffffd806e3d0910,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453
VOP_LOCK(fffffd806e3a6838,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
vn_lock(fffffd806e3a6838,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571
uvn_io(fffffd80733d2008,ffff800020b07a28,1,2,0) at uvn_io+0x2c8
sys/uvm/uvm_vnode.c:1189
uvn_get(fffffd80733d2008,8000000000000000,ffff800020b07c80,ffff800020b07c14,0,0)
at
uvn_get+0x226 sys/uvm/uvm_vnode.c:1049
uvm_fault(fffffd806e8bf8a8,20000000,2,2) at uvm_fault+0x11cc
sys/uvm/uvm_fault.c:1023
uvm_fault_wire(fffffd806e8bf8a8,20000000,20003000,2) at uvm_fault_wire+0x70
sys/uvm/uvm_fault.c:1295
uvm_map_pageable_wire(fffffd806e8bf8a8,fffffd806ed874c8,fffffd806e915d80,0,ffffffff81ad3527,0)
at
uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358
sys_mlock(ffff800020ad0c68,ffff800020b07e78,ffff800020b07ec0) at
sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
syscall(ffff800020b07f40) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020b07f40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
rbp 0xffff800020b076a0
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x3
r11 0xddda2b0f0e9c6e0
r12 0xfffffd800297f240
r13 0
r14 0xffffffff825d5af0 w_lodata+0x4ed90
r15 0xffffffff825dad70 w_lodata+0x54010
flags process=2<EXEC> proc=0
pri=50, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff800020ad0010,0xffffffff8260dd10
process=0xffff800020aece38 user=0xffff800020b02000,
vmspace=0xfffffd806e8bf8a8
estcpu=0, cpticks=0, pctcpu=0.0
40220 488410 20942 0 3 0x10008a pause ksh
20942 442566 63321 0 3 0x92 select sshd
26311 253616 1 0 3 0x100083 ttyin getty
63321 462048 1 0 3 0x80 select sshd
97440 483449 94534 73 3 0x100090 kqread syslogd
94534 244533 1 0 3 0x100082 netio syslogd
43898 517617 1 77 3 0x100090 poll dhclient
42362 159396 1 0 3 0x80 poll dhclient
37880 206914 0 0 3 0x14200 pgzero zerothread
58583 163947 0 0 3 0x14200 aiodoned aiodoned
70849 494129 0 0 3 0x14200 syncer update
19808 229334 0 0 3 0x14200 cleaner cleaner
37848 371853 0 0 3 0x14200 reaper reaper
73904 46265 0 0 3 0x14200 pgdaemon pagedaemon
70422 183018 0 0 3 0x14200 bored crynlk
68769 271196 0 0 3 0x14200 bored crypto
94403 23768 0 0 3 0x40014200 acpi0 acpi0
72686 64380 0 0 7 0x40014200 idle1
80649 372179 0 0 3 0x14200 bored softnet
24661 493359 0 0 3 0x14200 bored systqmp
97781 120697 0 0 3 0x14200 bored systq
92668 80854 0 0 3 0x40014200 bored softclock
42132 352542 0 0 3 0x40014200 idle0
3660 408637 0 0 3 0x14200 bored smr
1 275515 0 0 3 0x82 wait init
shared rwlock vmmaplk r = 0 (0xfffffd806e8bf8c0)
pcb 13 8K 8K 78643K 13 0
rtable 61 2K 2K 78643K 117 0
ifaddr 24 7K 7K 78643K 24 0
proc 47 50K 58K 78643K 278 0
ether_multi 1 0K 0K 78643K 1 0
exec 0 0K 1K 78643K 151 0
UVM aobj 2 2K 2K 78643K 2 0
temp 21 3019K 3083K 78643K 1712 0
8 0
8 0
rtentry 112 23 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 2 1 1 1 0
8 1
tcpcb 544 8 0 5 1 0 1 1 0
8 0
inpcb 280 22 0 16 1 0 1 1 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
8 0
ffsino 272 1393 0 15 92 0 92 92 0
8 0
nchpl 144 1567 0 31 57 0 57 57 0
8 0
uvmvnodes 72 1402 0 0 26 0 26 26 0
8 0
vnodes 208 1402 0 0 74 0 74 74 0
8 0
namei 1024 3479 0 3479 2 1 1 1 0
8 1
8 1
plimitpl 152 13 0 8 1 0 1 1 0
8 0
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 160 114 0 107 2 1 1 1 0
8 0
fdescpl 488 177 0 166 2 0 2 2 0
8 0
filepl 152 858 0 814 2 0 2 2 0
8 0
lockfpl 104 6 0 4 1 0 1 1 0
8 0
lockfspl 48 4 0 2 1 0 1 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 2 1 1 1 0
8 1
processpl 904 192 0 166 4 0 4 4 0
8 0
procpl 632 192 0 166 3 0 3 3 0
8 0
sockpl 384 64 0 48 2 0 2 2 0
8 0
mcl4k 4096 2 0 0 1 0 1 1 0
8 0
mcl2k 2048 78 0 0 10 0 10 10 0
8 0
bufpl 280 2101 0 258 132 0 132 132 0
8 0
anonpl 16 17338 0 16192 8 2 6 7 0
125 1
amapchunkpl 152 463 0 428 2 0 2 2 0
158 0
amappl16 192 35 0 33 1 0 1 1 0
8 0
amappl15 184 42 0 38 1 0 1 1 0
8 0
amappl14 176 13 0 12 2 1 1 1 0
8 0
amappl13 168 1 0 1 1 1 0 1 0
8 0
amappl12 160 4 0 4 1 1 0 1 0
8 0
amappl11 152 43 0 32 1 0 1 1 0
8 0
amappl10 144 3 0 3 2 1 1 1 0
8 1
amappl9 136 384 0 383 1 0 1 1 0
8 0
amappl8 128 64 0 60 1 0 1 1 0
8 0
amappl7 120 67 0 57 1 0 1 1 0
8 0
amappl6 112 43 0 41 1 0 1 1 0
8 0
amappl5 104 119 0 109 1 0 1 1 0
8 0
amappl4 96 399 0 374 1 0 1 1 0
8 0
amappl3 88 110 0 102 1 0 1 1 0
8 0
amappl2 80 689 0 635 3 1 2 2 0
8 0
amappl1 72 12186 0 11794 14 4 10 14 0
8 0
amappl 80 353 0 334 1 0 1 1 0
8 0
uaddrrnd 24 177 0 166 1 0 1 1 0
8 0
vmmpekpl 168 5087 0 5066 1 0 1 1 0
8 0
vmmpepl 168 26050 0 25267 45 7 38 45 0
357 3
vmsppl 368 176 0 166 2 0 2 2 0
8 0
pdppl 4096 361 0 332 5 0 5 5 0
8 0
pvpl 32 70444 0 67689 29 2 27 27 0
265 4
pmappl 232 176 0 166 1 0 1 1 0
8 0
8 0
HEAD commit: bcf611cd Set vm_map's pmap in uvm_map_setup().
git tree: openbsd
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=06cee7cfc759eb863aa2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=117f72fee00000
dashboard link: https://syzkaller.appspot.com/bug?extid=06cee7cfc759eb863aa2
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16c5eb61e00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+06cee7...@syzkaller.appspotmail.com
witness: lock order reversal:
2nd 0xfffffd806e3d0920 inode (&ip->i_lock)
witness_debugger sys/kern/subr_witness.c:2504 [inline]
witness_checkorder(fffffd806e3d0920,9,0) at witness_checkorder+0x1009
sys/kern/subr_witness.c:1086
rw_enter(fffffd806e3d0910,81) at rw_enter+0xd4
rrw_enter(fffffd806e3d0910,81) at rrw_enter+0x88 sys/kern/kern_rwlock.c:453
VOP_LOCK(fffffd806e3a6838,81) at VOP_LOCK+0xf9 sys/kern/vfs_vops.c:615
vn_lock(fffffd806e3a6838,81) at vn_lock+0x81 sys/kern/vfs_vnops.c:571
uvn_io(fffffd80733d2008,ffff800020b07a28,1,2,0) at uvn_io+0x2c8
sys/uvm/uvm_vnode.c:1189
uvn_get(fffffd80733d2008,8000000000000000,ffff800020b07c80,ffff800020b07c14,0,0)
at
uvn_get+0x226 sys/uvm/uvm_vnode.c:1049
uvm_fault(fffffd806e8bf8a8,20000000,2,2) at uvm_fault+0x11cc
sys/uvm/uvm_fault.c:1023
uvm_fault_wire(fffffd806e8bf8a8,20000000,20003000,2) at uvm_fault_wire+0x70
sys/uvm/uvm_fault.c:1295
uvm_map_pageable_wire(fffffd806e8bf8a8,fffffd806ed874c8,fffffd806e915d80,0,ffffffff81ad3527,0)
at
uvm_map_pageable_wire+0x2dd sys/uvm/uvm_map.c:2358
sys_mlock(ffff800020ad0c68,ffff800020b07e78,ffff800020b07ec0) at
sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
syscall(ffff800020b07f40) at syscall+0x4a4 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020b07f40) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe0530, count: -14
end of kernel
ddb{0}> show registers
rdi 0x3
rsi 0xffffffff824d0560 __sancov_gen_cov_switch_values.129
rdi 0x3
rbp 0xffff800020b076a0
rbx 0x3
rdx 0x8b
rcx 0x3
rax 0x3
r8 0xffffffff81ad1322 witness_checkorder+0xfe2
r9 0x5
r10 0xe447bcb076850b02
r9 0x5
r11 0xddda2b0f0e9c6e0
r12 0xfffffd800297f240
r13 0
r14 0xffffffff825d5af0 w_lodata+0x4ed90
r15 0xffffffff825dad70 w_lodata+0x54010
rip 0xffffffff8129eb48 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020b07690
cs 0x8
rflags 0x246
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor2121) pid=481767 stat=onproc
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
flags process=2<EXEC> proc=0
pri=50, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff800020ad0010,0xffffffff8260dd10
process=0xffff800020aece38 user=0xffff800020b02000,
vmspace=0xfffffd806e8bf8a8
estcpu=0, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*40392 481767 40220 0 7 0x2 syz-executor2121
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
40220 488410 20942 0 3 0x10008a pause ksh
20942 442566 63321 0 3 0x92 select sshd
26311 253616 1 0 3 0x100083 ttyin getty
63321 462048 1 0 3 0x80 select sshd
97440 483449 94534 73 3 0x100090 kqread syslogd
94534 244533 1 0 3 0x100082 netio syslogd
43898 517617 1 77 3 0x100090 poll dhclient
42362 159396 1 0 3 0x80 poll dhclient
37880 206914 0 0 3 0x14200 pgzero zerothread
58583 163947 0 0 3 0x14200 aiodoned aiodoned
70849 494129 0 0 3 0x14200 syncer update
19808 229334 0 0 3 0x14200 cleaner cleaner
37848 371853 0 0 3 0x14200 reaper reaper
73904 46265 0 0 3 0x14200 pgdaemon pagedaemon
70422 183018 0 0 3 0x14200 bored crynlk
68769 271196 0 0 3 0x14200 bored crypto
94403 23768 0 0 3 0x40014200 acpi0 acpi0
72686 64380 0 0 7 0x40014200 idle1
80649 372179 0 0 3 0x14200 bored softnet
24661 493359 0 0 3 0x14200 bored systqmp
97781 120697 0 0 3 0x14200 bored systq
92668 80854 0 0 3 0x40014200 bored softclock
42132 352542 0 0 3 0x40014200 idle0
3660 408637 0 0 3 0x14200 bored smr
1 275515 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 40392 (syz-executor2121) thread 0xffff800020ad0c68 (481767)
ddb{0}> show all locks
shared rwlock vmmaplk r = 0 (0xfffffd806e8bf8c0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5409
#3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2454
#4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82650348)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9454 6326K 6327K 78643K 10545 0
#1 rw_enter+0x453 sys/kern/kern_rwlock.c:309
#2 vm_map_lock_ln+0x10d sys/uvm/uvm_map.c:5409
#3 uvm_map_pageable+0x11d sys/uvm/uvm_map.c:2454
#4 sys_mlock+0x185 sys/uvm/uvm_mmap.c:765
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82650348)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
pcb 13 8K 8K 78643K 13 0
rtable 61 2K 2K 78643K 117 0
ifaddr 24 7K 7K 78643K 24 0
counters 39 33K 33K 78643K 39 0
ioctlops 0 0K 2K 78643K 13 0
mount 1 1K 1K 78643K 1 0
vnodes 1180 74K 74K 78643K 1185 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
UFS mount 5 36K 36K 78643K 5 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 1 0K 0K 78643K 1 0
ACPI 1809 196K 290K 78643K 12766 0
proc 47 50K 58K 78643K 278 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 0
NFS daemon 1 16K 16K 78643K 1 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 18 79K 79K 78643K 18 0
MSDOSFS mount 1 16K 16K 78643K 1 0
exec 0 0K 1K 78643K 151 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 62 3K 3K 78643K 709 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 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 3 0K 0K 78643K 3 0
crypto data 1 1K 1K 78643K 1 0
temp 21 3019K 3083K 78643K 1712 0
SYN cache 2 16K 16K 78643K 2 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
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
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
8 0
rtentry 112 23 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 2 1 1 1 0
8 1
tcpcb 544 8 0 5 1 0 1 1 0
8 0
inpcb 280 22 0 16 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
art_heap8 4096 1 0 0 1 0 1 1 0
8 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 1393 0 15 45 0 45 45 0
8 0
8 0
ffsino 272 1393 0 15 92 0 92 92 0
8 0
nchpl 144 1567 0 31 57 0 57 57 0
8 0
uvmvnodes 72 1402 0 0 26 0 26 26 0
8 0
vnodes 208 1402 0 0 74 0 74 74 0
8 0
namei 1024 3479 0 3479 2 1 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 2460 0 2460 2 1 1 2 0
8 0
8 1
plimitpl 152 13 0 8 1 0 1 1 0
8 0
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 160 114 0 107 2 1 1 1 0
8 0
fdescpl 488 177 0 166 2 0 2 2 0
8 0
filepl 152 858 0 814 2 0 2 2 0
8 0
lockfpl 104 6 0 4 1 0 1 1 0
8 0
lockfspl 48 4 0 2 1 0 1 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 2 1 1 1 0
8 1
processpl 904 192 0 166 4 0 4 4 0
8 0
procpl 632 192 0 166 3 0 3 3 0
8 0
sockpl 384 64 0 48 2 0 2 2 0
8 0
mcl4k 4096 2 0 0 1 0 1 1 0
8 0
mcl2k 2048 78 0 0 10 0 10 10 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 104 0 0 7 0 7 7 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
8 0
bufpl 280 2101 0 258 132 0 132 132 0
8 0
anonpl 16 17338 0 16192 8 2 6 7 0
125 1
amapchunkpl 152 463 0 428 2 0 2 2 0
158 0
amappl16 192 35 0 33 1 0 1 1 0
8 0
amappl15 184 42 0 38 1 0 1 1 0
8 0
amappl14 176 13 0 12 2 1 1 1 0
8 0
amappl13 168 1 0 1 1 1 0 1 0
8 0
amappl12 160 4 0 4 1 1 0 1 0
8 0
amappl11 152 43 0 32 1 0 1 1 0
8 0
amappl10 144 3 0 3 2 1 1 1 0
8 1
amappl9 136 384 0 383 1 0 1 1 0
8 0
amappl8 128 64 0 60 1 0 1 1 0
8 0
amappl7 120 67 0 57 1 0 1 1 0
8 0
amappl6 112 43 0 41 1 0 1 1 0
8 0
amappl5 104 119 0 109 1 0 1 1 0
8 0
amappl4 96 399 0 374 1 0 1 1 0
8 0
amappl3 88 110 0 102 1 0 1 1 0
8 0
amappl2 80 689 0 635 3 1 2 2 0
8 0
amappl1 72 12186 0 11794 14 4 10 14 0
8 0
amappl 80 353 0 334 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
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
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
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
8 0
vmmpekpl 168 5087 0 5066 1 0 1 1 0
8 0
vmmpepl 168 26050 0 25267 45 7 38 45 0
357 3
vmsppl 368 176 0 166 2 0 2 2 0
8 0
pdppl 4096 361 0 332 5 0 5 5 0
8 0
pvpl 32 70444 0 67689 29 2 27 27 0
265 4
pmappl 232 176 0 166 1 0 1 1 0
8 0
extentpl 40 46 0 29 1 0 1 1 0
8 0
phpool 112 136 0 3 4 0 4 4 0
8 0
8 0
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