panic: vmmaplk: lock not shared
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
272167 86181 0 0 0x4000000 0 syz-executor5349
*458595 86181 0 0 0x4000000 1K syz-executor5349
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
_rw_exit_read(ffff800020be4268,2a4,ffff800020c3b9b8) at _rw_exit_read+0x12b sys/kern/kern_rwlock.c:355
uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb uvmfault_unlockall sys/uvm/uvm_fault.c:1388 [inline]
uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb sys/uvm/uvm_fault.c:1266
pageflttrap() at pageflttrap+0x216 sys/arch/amd64/amd64/trap.c:200
kerntrap(32c9c977baf18ce4) at kerntrap+0xeb sys/arch/amd64/amd64/trap.c:294
alltraps_kern(6,14,c014575e,0,fffffd807a9f0980,20000000) at alltraps_kern+0x7b
copyin(ac266adfd581996c,0,ffff800020be4268,da98e9b5b78,0,360) at copyin+0x4b
syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,da722aec170,0,da722aec150,da722aec148) at Xsyscall+0x128
end of kernel
end trace frame: 0xda98e9b5b90, count: 5
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{1}>
ddb{1}> set $lines = 0
ddb{1}> show panic
vmmaplk: lock not shared
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
_rw_exit_read(ffff800020be4268,2a4,ffff800020c3b9b8) at _rw_exit_read+0x12b sys/kern/kern_rwlock.c:355
uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb uvmfault_unlockall sys/uvm/uvm_fault.c:1388 [inline]
uvm_fault(b139956407eb0b2,ffff800020be4268,0,ffffffff8167c690) at uvm_fault+0x23bb sys/uvm/uvm_fault.c:1266
pageflttrap() at pageflttrap+0x216 sys/arch/amd64/amd64/trap.c:200
kerntrap(32c9c977baf18ce4) at kerntrap+0xeb sys/arch/amd64/amd64/trap.c:294
alltraps_kern(6,14,c014575e,0,fffffd807a9f0980,20000000) at alltraps_kern+0x7b
copyin(ac266adfd581996c,0,ffff800020be4268,da98e9b5b78,0,360) at copyin+0x4b
syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 mi_syscall sys/sys/syscall_mi.h:99 [inline]
syscall(d47e3fa3a6c3d5de) at syscall+0x5a0 sys/arch/amd64/amd64/trap.c:583
Xsyscall(6,0,da722aec170,0,da722aec150,da722aec148) at Xsyscall+0x128
end of kernel
end trace frame: 0xda98e9b5b90, count: -10
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800020c3b820
rbx 0xffff800020c3b8c0
rdx 0xffffffff81f323f3 cy_pio_rec+0x25c
rcx 0x201
rax 0x1
r8 0xffffffff81d8b924 kprintf+0x174
r9 0x1
r10 0xbf460727fd0673bd
r11 0xc5a383bfe0fcfa68
r12 0x3000000008
r13 0xffff800020c3b830
r14 0x100
r15 0x1
rip 0xffffffff81202148 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800020c3b810
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor5349) pid=458595 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020b759d0,0xffffffff822f0c88
process=0xffff800020bca9f0 user=0xffff800020c36000, vmspace=0xfffffd806e929440
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
86181 324693 16851 0 2 0 syz-executor5349
86181 265288 16851 0 3 0x4000080 fsleep syz-executor5349
86181 272167 16851 0 7 0x4000000 syz-executor5349
86181 335292 16851 0 3 0x4000080 fsleep syz-executor5349
*86181 458595 16851 0 7 0x4000000 syz-executor5349
95573 292941 16164 0 3 0x80 nanosleep syz-executor5349
95573 410965 16164 0 3 0x4000080 fsleep syz-executor5349
95573 90381 16164 0 3 0x4000080 fsleep syz-executor5349
16851 467787 93284 0 3 0x80 nanosleep syz-executor5349
16164 230987 93284 0 3 0x80 nanosleep syz-executor5349
93284 317182 41067 0 3 0x82 nanosleep syz-executor5349
41067 435881 25486 0 3 0x10008a pause ksh
25486 446325 10014 0 3 0x92 select sshd
85512 36591 1 0 3 0x100083 ttyin getty
10014 370123 1 0 3 0x80 select sshd
26336 40635 53338 73 3 0x100090 kqread syslogd
53338 200128 1 0 3 0x100082 netio syslogd
2416 217780 1 77 3 0x100090 poll dhclient
11796 283976 1 0 3 0x80 poll dhclient
43079 62033 0 0 3 0x14200 pgzero zerothread
85179 220332 0 0 3 0x14200 aiodoned aiodoned
72486 399641 0 0 3 0x14200 syncer update
60697 441444 0 0 3 0x14200 cleaner cleaner
14001 523589 0 0 3 0x14200 reaper reaper
411 288416 0 0 3 0x14200 pgdaemon pagedaemon
74030 415480 0 0 3 0x14200 bored crynlk
36538 39048 0 0 3 0x14200 bored crypto
87340 416537 0 0 3 0x40014200 acpi0 acpi0
78219 52430 0 0 3 0x40014200 idle1
10023 7576 0 0 3 0x14200 bored softnet
13739 419554 0 0 3 0x14200 bored systqmp
32048 216604 0 0 3 0x14200 bored systq
24376 521205 0 0 3 0x40014200 bored softclock
877 404101 0 0 3 0x40014200 idle0
1 477967 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 86181 (syz-executor5349) thread 0xffff800020be4268 (458595)
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff823166a8) locked @ /syzkaller/managers/multicore/kernel/sys/kern/sched_bsd.c:436
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9442 6315K 6316K 78643K 10529 0 0
pcb 23 9K 9K 78643K 55 0 0
rtable 61 2K 2K 78643K 115 0 0
ifaddr 21 7K 7K 78643K 21 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 2K 78643K 13 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1168 73K 73K 78643K 1221 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 1K 78643K 2 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 2 0K 0K 78643K 2 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1792 194K 288K 78643K 12592 0 0
file desc 1 0K 0K 78643K 1 0 0
proc 40 38K 46K 78643K 201 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
in_multi 11 0K 0K 78643K 11 0 0
ether_multi 1 0K 0K 78643K 1 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 18 79K 79K 78643K 18 0 0
exec 0 0K 1K 78643K 149 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 65 19K 19K 78643K 811 0 0
UVM aobj 2 2K 2K 78643K 2 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
NDP 3 0K 0K 78643K 3 0 0
temp 30 2347K 2411K 78643K 1756 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 2 0 0 1 0 1 1 0 8 0
inpcbpl 280 92 0 82 1 0 1 1 0 8 0
plimitpl 152 15 0 8 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
syncache 264 5 0 5 2 1 1 1 0 8 1
tcpcb 544 78 0 71 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 96 0 0 6 0 6 6 0 8 0
art_table 32 97 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 1503 0 132 45 0 45 45 0 8 0
ffsino 272 1503 0 132 92 0 92 92 0 8 0
nchpl 144 1710 0 179 57 0 57 57 0 8 0
uvmvnodes 72 1512 0 0 28 0 28 28 0 8 0
vnodes 200 1512 0 0 80 0 80 80 0 8 0
namei 1024 3603 0 3603 2 1 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
scxspl 192 2746 0 2746 8 2 6 6 0 8 6
sigapl 432 210 0 196 2 0 2 2 0 8 0
futexpl 56 238 0 234 1 0 1 1 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 488 211 0 196 2 0 2 2 0 8 0
filepl 152 980 0 932 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 19 0 9 1 0 1 1 0 8 0
pgrppl 48 19 0 9 1 0 1 1 0 8 0
ucredpl 96 47 0 40 1 0 1 1 0 8 0
zombiepl 144 196 0 196 2 1 1 1 0 8 1
processpl 840 225 0 196 4 0 4 4 0 8 0
procpl 600 297 0 262 3 0 3 3 0 8 0
sockpl 384 134 0 114 3 0 3 3 0 8 1
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 73 0 0 9 0 9 9 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 92 0 0 6 0 6 6 0 8 0
bufpl 256 2052 0 261 112 0 112 112 0 8 0
anonpl 16 19336 0 18076 7 1 6 6 0 125 0
amapchunkpl 152 700 0 649 2 0 2 2 0 158 0
amappl16 192 146 0 132 1 0 1 1 0 8 0
amappl15 184 1 0 1 1 1 0 1 0 8 0
amappl14 176 1 0 1 1 1 0 1 0 8 0
amappl13 168 16 0 13 1 0 1 1 0 8 0
amappl12 160 8 0 8 2 1 1 1 0 8 1
amappl11 152 171 0 162 1 0 1 1 0 8 0
amappl10 144 43 0 43 2 1 1 1 0 8 1
amappl9 136 207 0 206 1 0 1 1 0 8 0
amappl8 128 110 0 100 1 0 1 1 0 8 0
amappl7 120 31 0 26 1 0 1 1 0 8 0
amappl6 112 42 0 38 1 0 1 1 0 8 0
amappl5 104 169 0 157 1 0 1 1 0 8 0
amappl4 96 254 0 233 1 0 1 1 0 8 0
amappl3 88 113 0 107 1 0 1 1 0 8 0
amappl2 80 883 0 826 2 0 2 2 0 8 0
amappl1 72 12588 0 12124 15 5 10 15 0 8 0
amappl 72 485 0 454 1 0 1 1 0 75 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma64 64 259 0 259 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 17 0 17 1 1 0 1 0 8 0
aobjpl 64 1 0 0 1 0 1 1 0 8 0
uaddrrnd 24 211 0 196 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 211 0 196 1 0 1 1 0 8 0
vmmpekpl 168 5334 0 5314 2 0 2 2 0 8 0
vmmpepl 168 26306 0 25390 55 15 40 43 0 357 0
vmsppl 360 210 0 196 2 0 2 2 0 8 0
pdppl 4096 429 0 392 5 0 5 5 0 8 0
pvpl 32 74702 0 71623 32 6 26 26 0 265 1
pmappl 224 210 0 196 1 0 1 1 0 8 0
extentpl 40 39 0 25 1 0 1 1 0 8 0
phpool 112 240 0 3 7 0 7 7 0 8 0
ddb{1}>