witness: acquiring duplicate lock of same type: "&sc->sc_lock"
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syzbot
Feb 19, 2019, 12:16:04 AM2/19/19
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 644ac04beb28 Rework the certificate generation examples a ..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11dd0a14c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa145722143cbd64
dashboard link: https://syzkaller.appspot.com/bug?extid=249e483406a1f7843915
compiler:
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+249e48...@syzkaller.appspotmail.com
witness: acquiring duplicate lock of same type: "&sc->sc_lock"
1st wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
2nd wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:242
Starting stack trace...
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650
[inline]
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe14 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800002b499c0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff800000026d00,ffff800002b49900) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd8067147d38,80085761,ffff800020c499f0,43,fffffd807f7c7900,ffff800020b424c8)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd807c38f868,80085761,ffff800020c499f0,ffff800020b424c8) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b424c8,ffff800020c49b38,ffff800020c49b20) at
sys_ioctl+0x646
syscall(ffff800020c49bd0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020c49bd0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,ffffffffffffff86,0,3,8fc6d2f2010) at Xsyscall+0x128
end of kernel
end trace frame: 0x8fef8fb6e60, count: 248
End of stack trace.
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:399
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe19 witness_debugger sys/kern/subr_witness.c:2650
[inline]
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe19 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800002b499c0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff800000026d00,ffff800002b49900) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd8067147d38,80085761,ffff800020c499f0,43,fffffd807f7c7900,ffff800020b424c8)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd807c38f868,80085761,ffff800020c499f0,ffff800020b424c8) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b424c8,ffff800020c49b38,ffff800020c49b20) at
sys_ioctl+0x646
syscall(ffff800020c49bd0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020c49bd0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,ffffffffffffff86,0,3,8fc6d2f2010) at Xsyscall+0x128
end of kernel
end trace frame: 0x8fef8fb6e60, count: -10
ddb{0}> show registers
rdi 0
rsi 0x3ffff acpi_pdirpa+0x2be67
rbp 0xffff800020c49620
rbx 0x3
rdx 0x40000 acpi_pdirpa+0x2be68
rcx 0xffff800002b4a000
rax 0xffff800001948780
r8 0xffffffff81316553 kprintf+0x183
r9 0x1
r10 0x25
r11 0x78e9c3e16df9df9f
r12 0xffffffff81f354ca substchar+0x955e
r13 0xf2
r14 0xffffffff81f25297 apollo_udma33_tim+0x16e4
r15 0xffffffff81f354ca substchar+0x955e
rip 0xffffffff81264218 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c49610
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=28374 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020b43530,0xffffffff82334d38
process=0xffff800020b44d30 user=0xffff800020c44000,
vmspace=0xfffffd807f00d9d8
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
33189 470300 81395 0 2 0 syz-executor.1
*33189 28374 81395 0 7 0x4000000 syz-executor.1
59445 4493 27999 0 3 0x80 nanosleep syz-executor.0
59445 137495 27999 0 3 0x4000080 poll syz-executor.0
59445 164088 27999 0 3 0x4000080 fsleep syz-executor.0
3124 262473 0 0 3 0x14200 bored sosplice
81395 365260 31919 0 3 0x82 nanosleep syz-executor.1
27999 209135 31919 0 3 0x82 nanosleep syz-executor.0
31919 254355 4350 0 3 0x82 thrsleep syz-fuzzer
31919 492609 4350 0 3 0x4000082 nanosleep syz-fuzzer
31919 485685 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 207818 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 49130 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 67811 4350 0 3 0x4000082 kqread syz-fuzzer
31919 198566 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 77692 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 42938 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 329808 4350 0 3 0x4000082 thrsleep syz-fuzzer
4350 64237 44183 0 3 0x10008a pause ksh
44183 31270 22142 0 3 0x92 select sshd
26934 501399 1 0 3 0x100083 ttyin getty
22142 6615 1 0 3 0x80 select sshd
91928 281404 66482 73 7 0x100090 syslogd
66482 356999 1 0 3 0x100082 netio syslogd
37229 253322 1 77 3 0x100090 poll dhclient
48816 89738 1 0 3 0x80 poll dhclient
82449 453870 0 0 3 0x14200 pgzero zerothread
64767 203378 0 0 3 0x14200 aiodoned aiodoned
73017 125028 0 0 3 0x14200 syncer update
8182 194953 0 0 3 0x14200 cleaner cleaner
76099 384736 0 0 3 0x14200 reaper reaper
87195 118574 0 0 3 0x14200 pgdaemon pagedaemon
49814 47250 0 0 3 0x14200 bored crynlk
3427 319868 0 0 3 0x14200 bored crypto
83117 278673 0 0 3 0x40014200 acpi0 acpi0
71215 243098 0 0 3 0x40014200 idle1
54906 401829 0 0 3 0x14200 bored softnet
34096 180178 0 0 3 0x14200 bored systqmp
38164 234191 0 0 3 0x14200 bored systq
85690 391942 0 0 3 0x40014200 bored softclock
36783 266248 0 0 3 0x40014200 idle0
1 521778 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 33189 (syz-executor.1) thread 0xffff800020b424c8 (28374)
exclusive rwlock wsmuxlk r = 0 (0xffff800000026dd0) locked @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 wsmux_attach_sc+0x48 sys/dev/wscons/wsmux.c:632
#2 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
#3 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
#4 sys_ioctl+0x646
#5 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
#5 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8235c720) locked @
/syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline]
#1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9482 6347K 6352K 78643K 10782 0 0
pcb 23 9K 10K 78643K 288 0 0
rtable 100 3K 4K 78643K 270 0 0
ifaddr 43 11K 12K 78643K 101 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 15 0 0
iov 0 0K 24K 78643K 59 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1207 76K 76K 78643K 1702 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 25 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 11 1K 1K 78643K 12 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1792 194K 288K 78643K 12592 0 0
file desc 6 17K 25K 78643K 881 0 0
sigio 1 0K 0K 78643K 18 0 0
proc 42 38K 70K 78643K 359 0 0
subproc 64 65538K 67586K 78643K 73 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 68 0 0
in_multi 33 2K 2K 78643K 45 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 72 318K 318K 78643K 72 0 0
exec 0 0K 1K 78643K 197 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 81 20K 21K 78643K 3068 0 0
UVM aobj 27 2K 2K 78643K 27 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 16 0 0
NDP 7 0K 0K 78643K 27 0 0
temp 94 2352K 2426K 78643K 4897 0 0
kqueue 0 0K 0K 78643K 8 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 0 1 0 1 1 0
8 0
inpcbpl 280 345 0 338 1 0 1 1 0
8 0
plimitpl 152 35 0 28 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtentry 112 41 0 1 2 0 2 2 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpcb 544 110 0 106 1 0 1 1 0
8 0
nd6 48 4 0 0 1 0 1 1 0
8 0
ppxss 1128 12 0 12 2 1 1 1 0
8 1
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 186 0 0 12 0 12 12 0
8 0
art_table 32 187 0 0 2 0 2 2 0
8 0
art_node 16 40 0 6 1 0 1 1 0
8 0
semapl 112 10 0 1 1 0 1 1 0
8 0
shmpl 112 25 0 0 1 0 1 1 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 3064 0 1641 47 1 46 47 0
8 0
ffsino 272 3064 0 1641 96 0 96 96 0
8 0
nchpl 144 4397 0 2773 61 0 61 61 0
8 0
uvmvnodes 72 3190 0 0 58 0 58 58 0
8 0
vnodes 200 3190 0 0 168 0 168 168 0
8 0
namei 1024 11056 0 11056 2 1 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scsiplug 64 4 0 4 1 1 0 1 0
8 0
scxspl 192 15907 0 15907 8 7 1 6 0
8 1
sigapl 432 1049 0 1035 2 0 2 2 0
8 0
futexpl 56 6100 0 6099 1 0 1 1 0
8 0
knotepl 112 185 0 158 2 1 1 2 0
8 0
kqueuepl 104 175 0 173 1 0 1 1 0
8 0
pipepl 112 230 0 211 2 1 1 1 0
8 0
fdescpl 488 1050 0 1035 3 1 2 3 0
8 0
filepl 152 4412 0 4316 8 4 4 5 0
8 0
lockfpl 104 285 0 284 5 4 1 1 0
8 0
lockfspl 32 354 0 353 5 4 1 1 0
8 0
sessionpl 112 17 0 7 1 0 1 1 0
8 0
pgrppl 48 17 0 7 1 0 1 1 0
8 0
ucredpl 96 1312 0 1305 1 0 1 1 0
8 0
zombiepl 144 1035 0 1035 2 1 1 1 0
8 1
processpl 840 1065 0 1035 4 0 4 4 0
8 0
procpl 600 2384 0 2342 4 0 4 4 0
8 0
sosppl 128 35 0 35 3 2 1 1 0
8 1
sockpl 384 577 0 560 6 3 3 3 0
8 1
mcl64k 65536 3 0 0 1 0 1 1 0
8 0
mcl9k 9216 3 0 0 1 0 1 1 0
8 0
mcl8k 8192 5 0 0 1 0 1 1 0
8 0
mcl4k 4096 6 0 0 1 0 1 1 0
8 0
mcl2k2 2112 5 0 0 1 0 1 1 0
8 0
mcl2k 2048 136 0 0 14 0 14 14 0
8 1
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 211 0 0 10 0 10 10 0
8 0
bufpl 256 9122 0 2150 436 0 436 436 0
8 0
anonpl 16 157489 0 154489 51 26 25 45 0 125
10
amapchunkpl 152 4722 0 4635 8 4 4 5 0
158 0
amappl16 192 8455 0 8336 41 30 11 30 0
8 4
amappl15 184 1 0 0 1 0 1 1 0
8 0
amappl14 176 441 0 438 2 1 1 1 0
8 0
amappl13 168 27 0 23 1 0 1 1 0
8 0
amappl12 160 438 0 434 2 1 1 1 0
8 0
amappl11 152 182 0 172 1 0 1 1 0
8 0
amappl10 144 52 0 52 2 2 0 1 0
8 0
amappl9 136 353 0 349 1 0 1 1 0
8 0
amappl8 128 563 0 540 1 0 1 1 0
8 0
amappl7 120 38 0 32 1 0 1 1 0
8 0
amappl6 112 502 0 492 1 0 1 1 0
8 0
amappl5 104 126 0 116 1 0 1 1 0
8 0
amappl4 96 267 0 248 1 0 1 1 0
8 0
amappl3 88 137 0 129 1 0 1 1 0
8 0
amappl2 80 9294 0 9231 2 0 2 2 0
8 0
amappl1 72 28132 0 27698 24 14 10 19 0
8 0
amappl 72 2633 0 2598 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 26 0 0 1 0 1 1 0
8 0
uaddrrnd 24 1050 0 1035 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 1050 0 1035 1 0 1 1 0
8 0
vmmpekpl 168 10412 0 10389 2 0 2 2 0
8 0
vmmpepl 168 116040 0 114890 106 50 56 72 0
357 5
vmsppl 360 1049 0 1035 2 0 2 2 0
8 0
pdppl 4096 2107 0 2070 6 1 5 6 0
8 0
pvpl 32 399975 0 393949 166 73 93 118 0 265
42
pmappl 224 1049 0 1035 1 0 1 1 0
8 0
extentpl 40 39 0 25 1 0 1 1 0
8 0
phpool 112 586 0 4 17 0 17 17 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#bug-status-tracking for how to communicate with
syzbot.
syzbot found the following crash on:
HEAD commit: 644ac04beb28 Rework the certificate generation examples a ..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=11dd0a14c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa145722143cbd64
dashboard link: https://syzkaller.appspot.com/bug?extid=249e483406a1f7843915
compiler:
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+249e48...@syzkaller.appspotmail.com
witness: acquiring duplicate lock of same type: "&sc->sc_lock"
1st wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
2nd wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:242
Starting stack trace...
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650
[inline]
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe14 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800002b499c0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff800000026d00,ffff800002b49900) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd8067147d38,80085761,ffff800020c499f0,43,fffffd807f7c7900,ffff800020b424c8)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd807c38f868,80085761,ffff800020c499f0,ffff800020b424c8) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b424c8,ffff800020c49b38,ffff800020c49b20) at
sys_ioctl+0x646
syscall(ffff800020c49bd0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020c49bd0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,ffffffffffffff86,0,3,8fc6d2f2010) at Xsyscall+0x128
end of kernel
end trace frame: 0x8fef8fb6e60, count: 248
End of stack trace.
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:399
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe19 witness_debugger sys/kern/subr_witness.c:2650
[inline]
witness_checkorder(ffff800002b499d0,1,ffffffff81f354ca,f2,0) at
witness_checkorder+0xe19 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800002b499c0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800002b49900,ffff800000026d50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff800000026d00,ffff800002b49900) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd8067147d38,80085761,ffff800020c499f0,43,fffffd807f7c7900,ffff800020b424c8)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd807c38f868,80085761,ffff800020c499f0,ffff800020b424c8) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b424c8,ffff800020c49b38,ffff800020c49b20) at
sys_ioctl+0x646
syscall(ffff800020c49bd0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020c49bd0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,ffffffffffffff86,0,3,8fc6d2f2010) at Xsyscall+0x128
end of kernel
end trace frame: 0x8fef8fb6e60, count: -10
ddb{0}> show registers
rdi 0
rsi 0x3ffff acpi_pdirpa+0x2be67
rbp 0xffff800020c49620
rbx 0x3
rdx 0x40000 acpi_pdirpa+0x2be68
rcx 0xffff800002b4a000
rax 0xffff800001948780
r8 0xffffffff81316553 kprintf+0x183
r9 0x1
r10 0x25
r11 0x78e9c3e16df9df9f
r12 0xffffffff81f354ca substchar+0x955e
r13 0xf2
r14 0xffffffff81f25297 apollo_udma33_tim+0x16e4
r15 0xffffffff81f354ca substchar+0x955e
rip 0xffffffff81264218 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c49610
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.1) pid=28374 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020b43530,0xffffffff82334d38
process=0xffff800020b44d30 user=0xffff800020c44000,
vmspace=0xfffffd807f00d9d8
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
33189 470300 81395 0 2 0 syz-executor.1
*33189 28374 81395 0 7 0x4000000 syz-executor.1
59445 4493 27999 0 3 0x80 nanosleep syz-executor.0
59445 137495 27999 0 3 0x4000080 poll syz-executor.0
59445 164088 27999 0 3 0x4000080 fsleep syz-executor.0
3124 262473 0 0 3 0x14200 bored sosplice
81395 365260 31919 0 3 0x82 nanosleep syz-executor.1
27999 209135 31919 0 3 0x82 nanosleep syz-executor.0
31919 254355 4350 0 3 0x82 thrsleep syz-fuzzer
31919 492609 4350 0 3 0x4000082 nanosleep syz-fuzzer
31919 485685 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 207818 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 49130 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 67811 4350 0 3 0x4000082 kqread syz-fuzzer
31919 198566 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 77692 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 42938 4350 0 3 0x4000082 thrsleep syz-fuzzer
31919 329808 4350 0 3 0x4000082 thrsleep syz-fuzzer
4350 64237 44183 0 3 0x10008a pause ksh
44183 31270 22142 0 3 0x92 select sshd
26934 501399 1 0 3 0x100083 ttyin getty
22142 6615 1 0 3 0x80 select sshd
91928 281404 66482 73 7 0x100090 syslogd
66482 356999 1 0 3 0x100082 netio syslogd
37229 253322 1 77 3 0x100090 poll dhclient
48816 89738 1 0 3 0x80 poll dhclient
82449 453870 0 0 3 0x14200 pgzero zerothread
64767 203378 0 0 3 0x14200 aiodoned aiodoned
73017 125028 0 0 3 0x14200 syncer update
8182 194953 0 0 3 0x14200 cleaner cleaner
76099 384736 0 0 3 0x14200 reaper reaper
87195 118574 0 0 3 0x14200 pgdaemon pagedaemon
49814 47250 0 0 3 0x14200 bored crynlk
3427 319868 0 0 3 0x14200 bored crypto
83117 278673 0 0 3 0x40014200 acpi0 acpi0
71215 243098 0 0 3 0x40014200 idle1
54906 401829 0 0 3 0x14200 bored softnet
34096 180178 0 0 3 0x14200 bored systqmp
38164 234191 0 0 3 0x14200 bored systq
85690 391942 0 0 3 0x40014200 bored softclock
36783 266248 0 0 3 0x40014200 idle0
1 521778 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 33189 (syz-executor.1) thread 0xffff800020b424c8 (28374)
exclusive rwlock wsmuxlk r = 0 (0xffff800000026dd0) locked @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 wsmux_attach_sc+0x48 sys/dev/wscons/wsmux.c:632
#2 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
#3 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
#4 sys_ioctl+0x646
#5 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
#5 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8235c720) locked @
/syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline]
#1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9482 6347K 6352K 78643K 10782 0 0
pcb 23 9K 10K 78643K 288 0 0
rtable 100 3K 4K 78643K 270 0 0
ifaddr 43 11K 12K 78643K 101 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 15 0 0
iov 0 0K 24K 78643K 59 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1207 76K 76K 78643K 1702 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 25 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 11 1K 1K 78643K 12 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1792 194K 288K 78643K 12592 0 0
file desc 6 17K 25K 78643K 881 0 0
sigio 1 0K 0K 78643K 18 0 0
proc 42 38K 70K 78643K 359 0 0
subproc 64 65538K 67586K 78643K 73 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 68 0 0
in_multi 33 2K 2K 78643K 45 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 72 318K 318K 78643K 72 0 0
exec 0 0K 1K 78643K 197 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 81 20K 21K 78643K 3068 0 0
UVM aobj 27 2K 2K 78643K 27 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 16 0 0
NDP 7 0K 0K 78643K 27 0 0
temp 94 2352K 2426K 78643K 4897 0 0
kqueue 0 0K 0K 78643K 8 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 0 1 0 1 1 0
8 0
inpcbpl 280 345 0 338 1 0 1 1 0
8 0
plimitpl 152 35 0 28 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtentry 112 41 0 1 2 0 2 2 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpcb 544 110 0 106 1 0 1 1 0
8 0
nd6 48 4 0 0 1 0 1 1 0
8 0
ppxss 1128 12 0 12 2 1 1 1 0
8 1
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 186 0 0 12 0 12 12 0
8 0
art_table 32 187 0 0 2 0 2 2 0
8 0
art_node 16 40 0 6 1 0 1 1 0
8 0
semapl 112 10 0 1 1 0 1 1 0
8 0
shmpl 112 25 0 0 1 0 1 1 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 3064 0 1641 47 1 46 47 0
8 0
ffsino 272 3064 0 1641 96 0 96 96 0
8 0
nchpl 144 4397 0 2773 61 0 61 61 0
8 0
uvmvnodes 72 3190 0 0 58 0 58 58 0
8 0
vnodes 200 3190 0 0 168 0 168 168 0
8 0
namei 1024 11056 0 11056 2 1 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scsiplug 64 4 0 4 1 1 0 1 0
8 0
scxspl 192 15907 0 15907 8 7 1 6 0
8 1
sigapl 432 1049 0 1035 2 0 2 2 0
8 0
futexpl 56 6100 0 6099 1 0 1 1 0
8 0
knotepl 112 185 0 158 2 1 1 2 0
8 0
kqueuepl 104 175 0 173 1 0 1 1 0
8 0
pipepl 112 230 0 211 2 1 1 1 0
8 0
fdescpl 488 1050 0 1035 3 1 2 3 0
8 0
filepl 152 4412 0 4316 8 4 4 5 0
8 0
lockfpl 104 285 0 284 5 4 1 1 0
8 0
lockfspl 32 354 0 353 5 4 1 1 0
8 0
sessionpl 112 17 0 7 1 0 1 1 0
8 0
pgrppl 48 17 0 7 1 0 1 1 0
8 0
ucredpl 96 1312 0 1305 1 0 1 1 0
8 0
zombiepl 144 1035 0 1035 2 1 1 1 0
8 1
processpl 840 1065 0 1035 4 0 4 4 0
8 0
procpl 600 2384 0 2342 4 0 4 4 0
8 0
sosppl 128 35 0 35 3 2 1 1 0
8 1
sockpl 384 577 0 560 6 3 3 3 0
8 1
mcl64k 65536 3 0 0 1 0 1 1 0
8 0
mcl9k 9216 3 0 0 1 0 1 1 0
8 0
mcl8k 8192 5 0 0 1 0 1 1 0
8 0
mcl4k 4096 6 0 0 1 0 1 1 0
8 0
mcl2k2 2112 5 0 0 1 0 1 1 0
8 0
mcl2k 2048 136 0 0 14 0 14 14 0
8 1
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 211 0 0 10 0 10 10 0
8 0
bufpl 256 9122 0 2150 436 0 436 436 0
8 0
anonpl 16 157489 0 154489 51 26 25 45 0 125
10
amapchunkpl 152 4722 0 4635 8 4 4 5 0
158 0
amappl16 192 8455 0 8336 41 30 11 30 0
8 4
amappl15 184 1 0 0 1 0 1 1 0
8 0
amappl14 176 441 0 438 2 1 1 1 0
8 0
amappl13 168 27 0 23 1 0 1 1 0
8 0
amappl12 160 438 0 434 2 1 1 1 0
8 0
amappl11 152 182 0 172 1 0 1 1 0
8 0
amappl10 144 52 0 52 2 2 0 1 0
8 0
amappl9 136 353 0 349 1 0 1 1 0
8 0
amappl8 128 563 0 540 1 0 1 1 0
8 0
amappl7 120 38 0 32 1 0 1 1 0
8 0
amappl6 112 502 0 492 1 0 1 1 0
8 0
amappl5 104 126 0 116 1 0 1 1 0
8 0
amappl4 96 267 0 248 1 0 1 1 0
8 0
amappl3 88 137 0 129 1 0 1 1 0
8 0
amappl2 80 9294 0 9231 2 0 2 2 0
8 0
amappl1 72 28132 0 27698 24 14 10 19 0
8 0
amappl 72 2633 0 2598 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 26 0 0 1 0 1 1 0
8 0
uaddrrnd 24 1050 0 1035 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 1050 0 1035 1 0 1 1 0
8 0
vmmpekpl 168 10412 0 10389 2 0 2 2 0
8 0
vmmpepl 168 116040 0 114890 106 50 56 72 0
357 5
vmsppl 360 1049 0 1035 2 0 2 2 0
8 0
pdppl 4096 2107 0 2070 6 1 5 6 0
8 0
pvpl 32 399975 0 393949 166 73 93 118 0 265
42
pmappl 224 1049 0 1035 1 0 1 1 0
8 0
extentpl 40 39 0 25 1 0 1 1 0
8 0
phpool 112 586 0 4 17 0 17 17 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#bug-status-tracking for how to communicate with
syzbot.
syzbot
Feb 19, 2019, 12:38:04 AM2/19/19
to syzkaller-o...@googlegroups.com
syzbot has found a reproducer for the following crash on:
HEAD commit: 644ac04beb28 Rework the certificate generation examples a ..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=169d6fbcc00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d757b0c00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+249e48...@syzkaller.appspotmail.com
login: witness: acquiring duplicate lock of same type: "&sc->sc_lock"
witness_checkorder+0xe14 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800000026dc0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff80000069ed00,ffff800000026d00) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd806dc977d8,80085761,ffff800020baf4f0,f,fffffd807f7c7c60,ffff800020b95078)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd806fcae1c8,80085761,ffff800020baf4f0,ffff800020b95078) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b95078,ffff800020baf638,ffff800020baf620) at
sys_ioctl+0x646
syscall(ffff800020baf6d0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020baf6d0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,7f7ffffcad68,0,1,7f7ffffcad78) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcad00, count: 248
witness_checkorder+0xe19 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800000026dc0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff80000069ed00,ffff800000026d00) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd806dc977d8,80085761,ffff800020baf4f0,f,fffffd807f7c7c60,ffff800020b95078)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd806fcae1c8,80085761,ffff800020baf4f0,ffff800020b95078) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b95078,ffff800020baf638,ffff800020baf620) at
sys_ioctl+0x646
syscall(ffff800020baf6d0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020baf6d0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,7f7ffffcad68,0,1,7f7ffffcad78) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcad00, count: -10
rbx 0x3
rdx 0xffffffff81f52f17 apollo_pio_rec+0xa34b
rcx 0x201
rax 0x14
r11 0x59e0b9fc10b215ae
flags process=2<EXEC> proc=0
pri=51, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff800020b94010,0xffffffff82334d38
process=0xffff800020b7a360 user=0xffff800020baa000,
vmspace=0xfffffd806e9739e0
estcpu=1, cpticks=0, pctcpu=0.0
41920 152467 18834 0 3 0x10008a pause ksh
18834 213292 91967 0 3 0x92 select sshd
4663 522458 1 0 3 0x100083 ttyin getty
91967 384704 1 0 3 0x80 select sshd
54303 332731 44759 73 7 0x100090 syslogd
44759 183979 1 0 3 0x100082 netio syslogd
48617 151159 1 77 3 0x100090 poll dhclient
64938 261895 1 0 3 0x80 poll dhclient
11046 294389 0 0 3 0x14200 pgzero zerothread
47403 144960 0 0 3 0x14200 aiodoned aiodoned
22838 408602 0 0 3 0x14200 syncer update
29570 9065 0 0 3 0x14200 cleaner cleaner
23441 221776 0 0 3 0x14200 reaper reaper
74094 339835 0 0 3 0x14200 pgdaemon pagedaemon
7642 13249 0 0 3 0x14200 bored crynlk
69130 176507 0 0 3 0x14200 bored crypto
64478 508683 0 0 3 0x40014200 acpi0 acpi0
46057 51299 0 0 3 0x40014200 idle1
47849 449681 0 0 3 0x14200 bored softnet
46479 239090 0 0 3 0x14200 bored systqmp
49508 104188 0 0 3 0x14200 bored systq
61305 382881 0 0 3 0x40014200 bored softclock
7244 389438 0 0 3 0x40014200 idle0
1 371115 0 0 3 0x82 wait init
exclusive rwlock wsmuxlk r = 0 (0xffff80000069edd0) locked @
pcb 23 9K 9K 78643K 55 0 0
rtable 61 2K 2K 78643K 115 0 0
ifaddr 21 7K 7K 78643K 21 0 0
proc 40 38K 46K 78643K 207 0 0
exec 0 0K 1K 78643K 150 0 0
UVM aobj 2 2K 2K 78643K 2 0 0
temp 30 2347K 2411K 78643K 1695 0 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
syncache 264 5 0 5 1 0 1 1 0
8 1
tcpcb 544 8 0 5 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
ffsino 272 1383 0 17 92 0 92 92 0
8 0
nchpl 144 1555 0 30 57 0 57 57 0
8 0
uvmvnodes 72 1392 0 0 26 0 26 26 0
8 0
vnodes 200 1392 0 0 74 0 74 74 0
8 0
namei 1024 3262 0 3262 2 1 1 1 0
8 1
sigapl 432 174 0 164 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 112 114 0 107 2 1 1 1 0
8 0
fdescpl 488 175 0 164 2 0 2 2 0
8 0
filepl 152 808 0 765 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 144 164 0 164 2 1 1 1 0
8 1
processpl 840 189 0 164 4 0 4 4 0
8 0
procpl 600 189 0 164 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 56 0 0 7 0 7 7 0
8 0
8 0
bufpl 256 1998 0 254 109 0 109 109 0
8 0
anonpl 16 16670 0 15588 6 1 5 6 0
125 0
amapchunkpl 152 487 0 452 2 0 2 2 0
158 0
amappl16 192 72 0 67 1 0 1 1 0
8 0
8 0
amappl13 168 16 0 13 1 0 1 1 0
8 0
amappl12 160 6 0 6 1 1 0 1 0
8 0
amappl11 152 174 0 165 1 0 1 1 0
8 0
amappl10 144 44 0 43 1 0 1 1 0
8 0
amappl9 136 205 0 204 1 0 1 1 0
8 0
amappl8 128 106 0 100 1 0 1 1 0
8 0
amappl7 120 29 0 25 1 0 1 1 0
8 0
amappl6 112 41 0 37 1 0 1 1 0
8 0
amappl5 104 139 0 128 1 0 1 1 0
8 0
amappl4 96 258 0 239 1 0 1 1 0
8 0
amappl3 88 112 0 107 1 0 1 1 0
8 0
amappl2 80 564 0 529 1 0 1 1 0
8 0
amappl1 72 11499 0 11118 14 4 10 14 0
8 0
amappl 72 365 0 346 1 0 1 1 0
8 0
uaddrrnd 24 175 0 164 1 0 1 1 0
8 0
vmmpekpl 168 5133 0 5113 1 0 1 1 0
8 0
vmmpepl 168 23435 0 22751 43 9 34 43 0
357 3
vmsppl 360 174 0 164 2 0 2 2 0
8 0
pdppl 4096 357 0 328 5 0 5 5 0
8 0
pvpl 32 68960 0 66254 29 3 26 26 0
265 1
pmappl 224 174 0 164 1 0 1 1 0
8 0
ddb{0}>
HEAD commit: 644ac04beb28 Rework the certificate generation examples a ..
git tree: openbsd
kernel config: https://syzkaller.appspot.com/x/.config?x=fa145722143cbd64
dashboard link: https://syzkaller.appspot.com/bug?extid=249e483406a1f7843915
compiler:
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12e8c53f400000
dashboard link: https://syzkaller.appspot.com/bug?extid=249e483406a1f7843915
compiler:
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16d757b0c00000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+249e48...@syzkaller.appspotmail.com
1st wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
2nd wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:242
Starting stack trace...
witness_checkorder(ffff800000026dd0,1,ffffffff81f354ca,f2,0) at
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
2nd wsmuxlk @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:242
Starting stack trace...
witness_checkorder+0xe14 witness_debugger sys/kern/subr_witness.c:2650
[inline]
witness_checkorder(ffff800000026dd0,1,ffffffff81f354ca,f2,0) at
[inline]
witness_checkorder+0xe14 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800000026dc0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff80000069ed00,ffff800000026d00) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd806dc977d8,80085761,ffff800020baf4f0,f,fffffd807f7c7c60,ffff800020b95078)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd806fcae1c8,80085761,ffff800020baf4f0,ffff800020b95078) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b95078,ffff800020baf638,ffff800020baf620) at
sys_ioctl+0x646
syscall(ffff800020baf6d0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020baf6d0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,7f7ffffcad68,0,1,7f7ffffcad78) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcad00, count: 248
End of stack trace.
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:399
witness_checkorder(ffff800000026dd0,1,ffffffff81f354ca,f2,0) at
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:399
witness_checkorder+0xe19 witness_debugger sys/kern/subr_witness.c:2650
[inline]
witness_checkorder(ffff800000026dd0,1,ffffffff81f354ca,f2,0) at
[inline]
witness_checkorder+0xe19 sys/kern/subr_witness.c:926
_rw_enter_read(ffff800000026dc0,ffffffff81f354ca,f2) at _rw_enter_read+0x80
sys/kern/kern_rwlock.c:102
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
wsmux_do_open sys/dev/wscons/wsmux.c:243 [inline]
wsmux_mux_open(ffff800000026d00,ffff80000069ed50) at wsmux_mux_open+0x82
sys/dev/wscons/wsmux.c:225
wsmux_attach_sc(ffff80000069ed00,ffff800000026d00) at wsmux_attach_sc+0x180
sys/dev/wscons/wsmux.c:667
VOP_IOCTL(fffffd806dc977d8,80085761,ffff800020baf4f0,f,fffffd807f7c7c60,ffff800020b95078)
at
VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
vn_ioctl(fffffd806fcae1c8,80085761,ffff800020baf4f0,ffff800020b95078) at
vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
sys_ioctl(ffff800020b95078,ffff800020baf638,ffff800020baf620) at
sys_ioctl+0x646
syscall(ffff800020baf6d0) at syscall+0x5ac mi_syscall
sys/sys/syscall_mi.h:99 [inline]
syscall(ffff800020baf6d0) at syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
Xsyscall(6,0,7f7ffffcad68,0,1,7f7ffffcad78) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcad00, count: -10
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800020baf120
rdi 0
rsi 0
rbx 0x3
rdx 0xffffffff81f52f17 apollo_pio_rec+0xa34b
rcx 0x201
rax 0x14
r8 0xffffffff81316553 kprintf+0x183
r9 0x1
r10 0x67371e6496edc06b
r9 0x1
r11 0x59e0b9fc10b215ae
r12 0xffffffff81f354ca substchar+0x955e
r13 0xf2
r14 0xffffffff81f25297 apollo_udma33_tim+0x16e4
r15 0xffffffff81f354ca substchar+0x955e
rip 0xffffffff81264218 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020baf110
r13 0xf2
r14 0xffffffff81f25297 apollo_udma33_tim+0x16e4
r15 0xffffffff81f354ca substchar+0x955e
rip 0xffffffff81264218 db_enter+0x18
cs 0x8
rflags 0x246
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor4885) pid=339125 stat=onproc
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
flags process=2<EXEC> proc=0
pri=51, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff800020b94010,0xffffffff82334d38
process=0xffff800020b7a360 user=0xffff800020baa000,
vmspace=0xfffffd806e9739e0
estcpu=1, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*92409 339125 41920 0 7 0x2 syz-executor4885
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
41920 152467 18834 0 3 0x10008a pause ksh
18834 213292 91967 0 3 0x92 select sshd
4663 522458 1 0 3 0x100083 ttyin getty
91967 384704 1 0 3 0x80 select sshd
54303 332731 44759 73 7 0x100090 syslogd
44759 183979 1 0 3 0x100082 netio syslogd
48617 151159 1 77 3 0x100090 poll dhclient
64938 261895 1 0 3 0x80 poll dhclient
11046 294389 0 0 3 0x14200 pgzero zerothread
47403 144960 0 0 3 0x14200 aiodoned aiodoned
22838 408602 0 0 3 0x14200 syncer update
29570 9065 0 0 3 0x14200 cleaner cleaner
23441 221776 0 0 3 0x14200 reaper reaper
74094 339835 0 0 3 0x14200 pgdaemon pagedaemon
7642 13249 0 0 3 0x14200 bored crynlk
69130 176507 0 0 3 0x14200 bored crypto
64478 508683 0 0 3 0x40014200 acpi0 acpi0
46057 51299 0 0 3 0x40014200 idle1
47849 449681 0 0 3 0x14200 bored softnet
46479 239090 0 0 3 0x14200 bored systqmp
49508 104188 0 0 3 0x14200 bored systq
61305 382881 0 0 3 0x40014200 bored softclock
7244 389438 0 0 3 0x40014200 idle0
1 371115 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 92409 (syz-executor4885) thread 0xffff800020b95078 (339125)
ddb{0}> show all locks
exclusive rwlock wsmuxlk r = 0 (0xffff80000069edd0) locked @
/syzkaller/managers/multicore/kernel/sys/dev/wscons/wsmux.c:626
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 wsmux_attach_sc+0x48 sys/dev/wscons/wsmux.c:632
#2 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
#3 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
#4 sys_ioctl+0x646
#5 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
#5 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8235c720) locked @
/syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline]
#1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9444 6323K 6323K 78643K 10532 0 0
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 wsmux_attach_sc+0x48 sys/dev/wscons/wsmux.c:632
#2 VOP_IOCTL+0x9a sys/kern/vfs_vops.c:290
#3 vn_ioctl+0xc9 sys/kern/vfs_vnops.c:512
#4 sys_ioctl+0x646
#5 syscall+0x5ac mi_syscall sys/sys/syscall_mi.h:99 [inline]
#5 syscall+0x5ac sys/arch/amd64/amd64/trap.c:574
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8235c720) locked @
/syzkaller/managers/multicore/kernel/sys/sys/syscall_mi.h:90
#0 witness_lock+0x58a sys/kern/subr_witness.c:1205
#1 syscall+0x47f mi_syscall sys/sys/syscall_mi.h:91 [inline]
#1 syscall+0x47f sys/arch/amd64/amd64/trap.c:574
#2 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
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 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
UFS mount 5 36K 36K 78643K 5 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 1792 194K 288K 78643K 12592 0 0
file desc 1 0K 0K 78643K 1 0 0
ACPI 1792 194K 288K 78643K 12592 0 0
proc 40 38K 46K 78643K 207 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
NFS daemon 1 16K 16K 78643K 1 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
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
exec 0 0K 1K 78643K 150 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 651 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 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
crypto data 1 1K 1K 78643K 1 0 0
temp 30 2347K 2411K 78643K 1695 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
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg
Idle
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
plcache 128 20 0 0 1 0 1 1 0
8 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
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
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 1383 0 17 45 0 45 45 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
8 0
ffsino 272 1383 0 17 92 0 92 92 0
8 0
nchpl 144 1555 0 30 57 0 57 57 0
8 0
uvmvnodes 72 1392 0 0 26 0 26 26 0
8 0
vnodes 200 1392 0 0 74 0 74 74 0
8 0
namei 1024 3262 0 3262 2 1 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scxspl 192 2230 0 2230 2 1 1 2 0
percpumem 16 30 0 0 1 0 1 1 0
8 0
8 1
sigapl 432 174 0 164 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 112 114 0 107 2 1 1 1 0
8 0
fdescpl 488 175 0 164 2 0 2 2 0
8 0
filepl 152 808 0 765 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 144 164 0 164 2 1 1 1 0
8 1
processpl 840 189 0 164 4 0 4 4 0
8 0
procpl 600 189 0 164 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 56 0 0 7 0 7 7 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 75 0 0 5 0 5 5 0
8 0
8 0
bufpl 256 1998 0 254 109 0 109 109 0
8 0
anonpl 16 16670 0 15588 6 1 5 6 0
125 0
amapchunkpl 152 487 0 452 2 0 2 2 0
158 0
amappl16 192 72 0 67 1 0 1 1 0
8 0
amappl15 184 1 0 0 1 0 1 1 0
8 0
amappl14 176 1 0 1 1 1 0 1 0
8 0
8 0
amappl13 168 16 0 13 1 0 1 1 0
8 0
amappl12 160 6 0 6 1 1 0 1 0
8 0
amappl11 152 174 0 165 1 0 1 1 0
8 0
amappl10 144 44 0 43 1 0 1 1 0
8 0
amappl9 136 205 0 204 1 0 1 1 0
8 0
amappl8 128 106 0 100 1 0 1 1 0
8 0
amappl7 120 29 0 25 1 0 1 1 0
8 0
amappl6 112 41 0 37 1 0 1 1 0
8 0
amappl5 104 139 0 128 1 0 1 1 0
8 0
amappl4 96 258 0 239 1 0 1 1 0
8 0
amappl3 88 112 0 107 1 0 1 1 0
8 0
amappl2 80 564 0 529 1 0 1 1 0
8 0
amappl1 72 11499 0 11118 14 4 10 14 0
8 0
amappl 72 365 0 346 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
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
8 0
uaddrrnd 24 175 0 164 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 175 0 164 1 0 1 1 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
8 0
vmmpekpl 168 5133 0 5113 1 0 1 1 0
8 0
vmmpepl 168 23435 0 22751 43 9 34 43 0
357 3
vmsppl 360 174 0 164 2 0 2 2 0
8 0
pdppl 4096 357 0 328 5 0 5 5 0
8 0
pvpl 32 68960 0 66254 29 3 26 26 0
265 1
pmappl 224 174 0 164 1 0 1 1 0
8 0
extentpl 40 39 0 25 1 0 1 1 0
8 0
phpool 112 234 0 3 7 0 7 7 0
extentpl 40 39 0 25 1 0 1 1 0
8 0
8 0
ddb{0}>
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