login: panic: rw_enter: dklk locking against myself
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*407192 66264 0 0x2 0x4000000 0 syz-executor1941
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8247f6c9) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff8000006aa058,11) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vndopen(2902,3,2000,ffff8000ffff87e8) at vndopen+0x8d sys/dev/vnd.c:185
spec_open(ffff80002169a888) at spec_open+0x3c8 sys/kern/spec_vnops.c:157
VOP_OPEN(fffffd806e3ff848,3,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff80002169ab20,3,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
vndioctl(2902,c0384600,ffff80002169ae40,81,ffff8000ffff87e8) at vndioctl+0xa07 sys/dev/vnd.c:452
VOP_IOCTL(fffffd806e3ff848,c0384600,ffff80002169ae40,81,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_IOCTL+0x8d sys/kern/vfs_vops.c:264
vn_ioctl(fffffd807320eb48,c0384600,ffff80002169ae40,ffff8000ffff87e8) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff87e8,ffff80002169af58,ffff80002169afb0) at sys_ioctl+0x49e
syscall(ffff80002169b020) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd579302b000, count: 2
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: rw_enter: dklk locking against myself
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8247f6c9) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff8000006aa058,11) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vndopen(2902,3,2000,ffff8000ffff87e8) at vndopen+0x8d sys/dev/vnd.c:185
spec_open(ffff80002169a888) at spec_open+0x3c8 sys/kern/spec_vnops.c:157
VOP_OPEN(fffffd806e3ff848,3,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff80002169ab20,3,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
vndioctl(2902,c0384600,ffff80002169ae40,81,ffff8000ffff87e8) at vndioctl+0xa07 sys/dev/vnd.c:452
VOP_IOCTL(fffffd806e3ff848,c0384600,ffff80002169ae40,81,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_IOCTL+0x8d sys/kern/vfs_vops.c:264
vn_ioctl(fffffd807320eb48,c0384600,ffff80002169ae40,ffff8000ffff87e8) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff87e8,ffff80002169af58,ffff80002169afb0) at sys_ioctl+0x49e
syscall(ffff80002169b020) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd579302b000, count: -13
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002169a650
rbx 0x4
rdx 0x8b
rcx 0x2
rax 0x2d
r8 0xffffffff816b3695 kprintf+0x145
r9 0x1
r10 0xfe16f6493c46bd6e
r11 0xc4be0aa87f9f6cd8
r12 0
r13 0xffff8000ffff87ec
r14 0
r15 0x1
rip 0xffffffff81036b58 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002169a640
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor1941) pid=407192 stat=onproc
flags process=2<EXEC> proc=4000000<THREAD>
pri=32, usrpri=53, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff8a88,0xffffffff829337f0
process=0xffff8000ffff73c0 user=0xffff800021696000, vmspace=0xfffffd807f00b550
estcpu=3, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
66264 318256 33013 0 2 0x2 syz-executor1941
*66264 407192 33013 0 7 0x4000002 syz-executor1941
33013 518112 67422 0 3 0x10008a sigsusp ksh
67422 396821 27718 0 3 0x9a select sshd
57434 439925 1 0 3 0x100083 ttyin getty
27718 100963 1 0 3 0x88 select sshd
15252 220668 96216 73 3 0x100090 kqread syslogd
96216 75708 1 0 3 0x100082 netio syslogd
93030 97484 1 0 3 0x100080 kqread resolvd
77844 23199 53652 77 3 0x100092 kqread dhcpleased
41901 367874 53652 77 3 0x100092 kqread dhcpleased
53652 368385 1 0 3 0x80 kqread dhcpleased
70662 351610 0 0 3 0x14200 bored smr
18873 340960 0 0 2 0x14200 zerothread
57925 492904 0 0 3 0x14200 aiodoned aiodoned
93501 391128 0 0 3 0x14200 syncer update
7236 440225 0 0 3 0x14200 cleaner cleaner
37910 43541 0 0 3 0x14200 reaper reaper
86593 417391 0 0 3 0x14200 pgdaemon pagedaemon
43909 376950 0 0 3 0x14200 bored crynlk
34151 242648 0 0 3 0x14200 bored crypto
97091 478150 0 0 3 0x14200 bored viomb
93393 418114 0 0 3 0x40014200 acpi0 acpi0
63556 495266 0 0 3 0x14200 bored softnet
23082 73247 0 0 3 0x14200 bored systqmp
30919 153874 0 0 3 0x14200 bored systq
20378 165207 0 0 3 0x40014200 bored softclock
22239 330260 0 0 3 0x40014200 idle0
1 397759 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10093 6342K 6373K 78643K 11183 0
pcb 13 8K 8K 78643K 13 0
rtable 62 2K 2K 78643K 114 0
ifaddr 24 7K 7K 78643K 24 0
counters 19 16K 16K 78643K 19 0
ioctlops 0 0K 2K 78643K 25 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1182 74K 74K 78643K 1187 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 0K 0K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 1 0K 0K 78643K 1 0
proc 55 54K 55K 78643K 222 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
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 19 95K 95K 78643K 19 0
exec 0 0K 2K 78643K 325 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 83 3K 5K 78643K 1519 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 3 0K 0K 78643K 3 0
temp 18 4189K 4253K 78643K 1787 0
kqueue 9 12K 12K 78643K 9 0
SYN cache 2 16K 16K 78643K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 20 0 17 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 120 33 0 20 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 8 0 5 1 0 1 1 0 8 0
arp 88 2 0 0 1 0 1 1 0 8 0
inpcb 304 25 0 19 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 96 0 0 6 0 6 6 0 8 0
art_table 32 97 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1405 0 22 87 0 87 87 0 8 0
ffsino 240 1405 0 22 82 0 82 82 0 8 0
nchpl 144 1581 0 39 58 0 58 58 0 8 0
uvmvnodes 72 1414 0 0 26 0 26 26 0 8 0
vnodes 224 1414 0 0 84 0 84 84 0 8 0
namei 1024 3913 0 3913 2 1 1 1 0 8 1
scxspl 216 3715 0 3715 10 9 1 8 0 8 1
plimitpl 152 15 0 9 1 0 1 1 0 8 0
sigapl 424 235 0 207 4 0 4 4 0 8 0
futexpl 56 5 0 5 1 0 1 1 0 8 1
knotepl 112 121 0 98 1 0 1 1 0 8 0
kqueuepl 184 5 0 0 1 0 1 1 0 8 0
pipepl 304 65 0 62 2 1 1 1 0 8 0
fdescpl 432 220 0 207 2 0 2 2 0 8 0
filepl 120 969 0 913 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 144 17 0 9 1 0 1 1 0 8 0
pgrppl 48 17 0 9 1 0 1 1 0 8 0
ucredpl 96 64 0 54 1 0 1 1 0 8 0
zombiepl 144 207 0 207 2 1 1 1 0 8 1
processpl 1008 235 0 207 4 0 4 4 0 8 0
procpl 672 236 0 207 3 0 3 3 0 8 0
sockpl 448 78 0 56 3 0 3 3 0 8 0
mcl8k 8192 9 0 9 2 1 1 1 0 8 1
mcl4k 4096 5 0 5 2 1 1 1 0 8 1
mcl2k 2048 7966 0 7928 9 2 7 8 0 8 1
mtagpl 96 3 0 3 1 1 0 1 0 8 0
mbufpl 256 13399 0 13322 9 2 7 8 0 8 0
bufpl 280 2117 0 87 145 0 145 145 0 8 0
anonpl 24 32556 0 30241 18 3 15 15 0 188 1
amapchunkpl 152 2894 0 2743 6 0 6 6 0 158 0
amappl16 200 28 0 26 2 1 1 1 0 8 0
amappl15 192 61 0 58 1 0 1 1 0 8 0
amappl13 176 16 0 15 2 1 1 1 0 8 0
amappl12 168 4 0 4 2 1 1 1 0 8 1
amappl11 160 54 0 40 1 0 1 1 0 8 0
amappl9 144 298 0 296 1 0 1 1 0 8 0
amappl8 136 260 0 257 1 0 1 1 0 8 0
amappl7 128 29 0 28 1 0 1 1 0 8 0
amappl6 120 31 0 27 1 0 1 1 0 8 0
amappl5 112 246 0 232 1 0 1 1 0 8 0
amappl4 104 484 0 463 1 0 1 1 0 8 0
amappl3 96 151 0 137 1 0 1 1 0 8 0
amappl2 88 278 0 246 1 0 1 1 0 8 0
amappl1 80 7079 0 6721 12 3 9 9 0 8 1
amappl 88 1290 0 1223 2 0 2 2 0 92 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 220 0 207 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 220 0 207 1 0 1 1 0 8 0
vmmpekpl 168 5762 0 5750 1 0 1 1 0 8 0
vmmpepl 168 21461 0 20654 42 4 38 38 0 357 2
vmsppl 272 219 0 207 2 1 1 2 0 8 0
rwobjpl 24 6687 0 6163 5 1 4 4 0 8 0
pdppl 4096 446 0 414 52 20 32 38 0 8 0
pvpl 32 105456 0 101402 41 6 35 35 0 265 2
pmappl 192 219 0 207 1 0 1 1 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 264 0 30 7 0 7 7 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8247f6c9) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff8000006aa058,11) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vndopen(2902,3,2000,ffff8000ffff87e8) at vndopen+0x8d sys/dev/vnd.c:185
spec_open(ffff80002169a888) at spec_open+0x3c8 sys/kern/spec_vnops.c:157
VOP_OPEN(fffffd806e3ff848,3,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff80002169ab20,3,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
vndioctl(2902,c0384600,ffff80002169ae40,81,ffff8000ffff87e8) at vndioctl+0xa07 sys/dev/vnd.c:452
VOP_IOCTL(fffffd806e3ff848,c0384600,ffff80002169ae40,81,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_IOCTL+0x8d sys/kern/vfs_vops.c:264
vn_ioctl(fffffd807320eb48,c0384600,ffff80002169ae40,ffff8000ffff87e8) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff87e8,ffff80002169af58,ffff80002169afb0) at sys_ioctl+0x49e
syscall(ffff80002169b020) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd579302b000, count: -13
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8247f6c9) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff8000006aa058,11) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vndopen(2902,3,2000,ffff8000ffff87e8) at vndopen+0x8d sys/dev/vnd.c:185
spec_open(ffff80002169a888) at spec_open+0x3c8 sys/kern/spec_vnops.c:157
VOP_OPEN(fffffd806e3ff848,3,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff80002169ab20,3,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
vndioctl(2902,c0384600,ffff80002169ae40,81,ffff8000ffff87e8) at vndioctl+0xa07 sys/dev/vnd.c:452
VOP_IOCTL(fffffd806e3ff848,c0384600,ffff80002169ae40,81,fffffd807f7d8ba0,ffff8000ffff87e8) at VOP_IOCTL+0x8d sys/kern/vfs_vops.c:264
vn_ioctl(fffffd807320eb48,c0384600,ffff80002169ae40,ffff8000ffff87e8) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000ffff87e8,ffff80002169af58,ffff80002169afb0) at sys_ioctl+0x49e
syscall(ffff80002169b020) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd579302b000, count: -13
ddb>