panic: rw_enter: vcpulock locking against myself

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syzbot

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Sep 2, 2021, 1:55:24 AMSep 2
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Hello,

syzbot found the following issue on:

HEAD commit: e42df31d2641 Update project tag line, shorten some err() c..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=117bd20b300000
kernel config: https://syzkaller.appspot.com/x/.config?x=fe55924c11e64b0a
dashboard link: https://syzkaller.appspot.com/bug?extid=c78b5644c7dc3d9b689a

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c78b56...@syzkaller.appspotmail.com

panic: rw_enter: vcpulock locking against myself
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*239124 43544 0 0 0x4000000 0 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232
VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e
syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5f3645c90a0, count: 6
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: vcpulock locking against myself
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232
VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e
syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5f3645c90a0, count: -9
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff8000216e1120
rbx 0x4
rdx 0x8b
rcx 0x2
rax 0x31
r8 0xffffffff813e3a25 kprintf+0x145
r9 0x1
r10 0xa062e1da398b67fd
r11 0xa99ebe9c7d96973b
r12 0
r13 0xffff8000216687e4
r14 0
r15 0x1
rip 0xffffffff8155ed48 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000216e1110
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor.0) pid=239124 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=80, usrpri=80, nice=20
forw=0xffffffffffffffff, list=0xffff800021669260,0xffffffff8280e698
process=0xffff80002164afc8 user=0xffff8000216dc000, vmspace=0xfffffd806b068120
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
43544 340103 95756 0 2 0 syz-executor.0
*43544 239124 95756 0 7 0x4000000 syz-executor.0
9651 135118 37853 0 2 0x2 syz-executor.1
88405 360603 0 0 3 0x14200 bored sosplice
95756 324501 37853 0 3 0x82 nanoslp syz-executor.0
37853 185936 61704 0 3 0x82 thrsleep syz-fuzzer
37853 317913 61704 0 3 0x4000082 thrsleep syz-fuzzer
37853 359996 61704 0 3 0x4000082 kqread syz-fuzzer
37853 47017 61704 0 3 0x4000082 thrsleep syz-fuzzer
37853 73284 61704 0 3 0x4000082 thrsleep syz-fuzzer
37853 137806 61704 0 3 0x4000082 thrsleep syz-fuzzer
37853 28479 61704 0 3 0x4000082 thrsleep syz-fuzzer
61704 464313 86325 0 3 0x10008a sigsusp ksh
86325 325433 15221 0 3 0x9a select sshd
70110 122689 1 0 3 0x100083 ttyin getty
15221 229947 1 0 3 0x88 select sshd
5513 364252 46190 73 3 0x100090 kqread syslogd
46190 11538 1 0 3 0x100082 netio syslogd
56464 515076 1 0 3 0x100080 kqread resolvd
57822 293020 95387 77 3 0x100092 kqread dhcpleased
48642 178913 95387 77 3 0x100092 kqread dhcpleased
95387 24186 1 0 3 0x80 kqread dhcpleased
34540 57491 0 0 3 0x14200 bored smr
4338 90880 0 0 2 0x14200 zerothread
33555 197537 0 0 3 0x14200 aiodoned aiodoned
49512 3391 0 0 3 0x14200 syncer update
87076 156849 0 0 3 0x14200 cleaner cleaner
95942 183569 0 0 3 0x14200 reaper reaper
19041 70450 0 0 3 0x14200 pgdaemon pagedaemon
80303 400625 0 0 3 0x14200 bored crynlk
35732 507648 0 0 3 0x14200 bored crypto
74095 518415 0 0 3 0x14200 bored viomb
4055 137371 0 0 3 0x40014200 acpi0 acpi0
98812 114128 0 0 3 0x14200 bored softnet
86803 65920 0 0 3 0x14200 bored systqmp
43656 291681 0 0 3 0x14200 bored systq
72436 325371 0 0 3 0x40014200 bored softclock
70062 328683 0 0 3 0x40014200 idle0
1 437391 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 10125 6356K 7122K 78643K 14052 0
pcb 13 8K 8K 78643K 124 0
rtable 110 4K 7K 78643K 367 0
ifaddr 53 11K 13K 78643K 103 0
counters 21 16K 16K 78643K 28 0
ioctlops 0 0K 4K 78643K 110 0
iov 0 0K 16K 78643K 95 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1221 77K 77K 78643K 2138 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 12 0
VM map 2 0K 0K 78643K 2 0
sem 10 0K 0K 78643K 10 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 5 13K 25K 78643K 2735 0
sigio 0 0K 0K 78643K 23 0
proc 61 55K 71K 78643K 512 0
subproc 32 2K 2K 78643K 85 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 108 0
in_multi 33 2K 2K 78643K 194 0
ether_multi 1 0K 0K 78643K 41 0
mrt 0 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 43 201K 201K 78643K 43 0
exec 0 0K 2K 78643K 500 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 221 97K 116K 78643K 33505 0
UVM aobj 8 7K 7K 78643K 8 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 89 0
NDP 8 0K 0K 78643K 25 0
temp 113 4197K 4261K 78643K 21022 0
kqueue 10 14K 28K 78643K 234 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 98 0 95 1 0 1 1 0 8 0
rtentry 112 78 0 34 2 0 2 2 0 8 0
unpcb 120 594 0 581 1 0 1 1 0 8 0
syncache 296 6 0 6 2 2 0 1 0 8 0
tcpqe 32 424 0 424 2 2 0 1 0 8 0
tcpcb 736 298 0 291 7 5 2 3 0 8 1
arp 88 12 0 6 1 0 1 1 0 8 0
inpcb 304 912 0 904 5 4 1 2 0 8 0
nd6 48 15 0 9 1 0 1 1 0 8 0
kcovpl 48 5 0 3 1 0 1 1 0 8 0
pfstscr 40 8 0 7 1 0 1 1 0 8 0
pfrktable 1344 14 0 14 1 0 1 1 0 8 1
pftag 88 4 0 4 1 0 1 1 0 8 1
pfstitem 24 2 0 0 1 0 1 1 0 8 0
pfstkey 112 16 0 14 1 0 1 1 0 8 0
pfstate 320 8 0 7 1 0 1 1 0 8 0
pfrule 1360 15 0 15 3 2 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 321 0 132 12 0 12 12 0 8 0
art_table 32 322 0 132 2 0 2 2 0 8 0
art_node 16 77 0 37 1 0 1 1 0 8 0
sysvmsgpl 40 8 0 2 1 0 1 1 0 8 0
semapl 112 8 0 0 1 0 1 1 0 8 0
shmpl 112 5 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 4797 0 3393 89 0 89 89 0 8 0
ffsino 240 4797 0 3393 83 0 83 83 0 8 0
nchpl 144 8237 0 6638 60 0 60 60 0 8 0
uvmvnodes 72 5503 0 0 101 0 101 101 0 8 0
vnodes 224 5503 0 0 324 0 324 324 0 8 0
namei 1024 20974 0 20973 2 1 1 1 0 8 0
vcpupl 1984 5 0 0 1 0 1 1 0 8 0
vmpool 528 15 0 10 1 0 1 1 0 8 0
pfiaddrpl 120 4 0 4 1 0 1 1 0 8 1
scsiplug 72 14 0 14 2 2 0 1 0 8 0
scxspl 216 24125 0 24125 10 9 1 8 0 8 1
plimitpl 152 83 0 75 1 0 1 1 0 8 0
sigapl 424 2957 0 2925 4 0 4 4 0 8 0
futexpl 56 25268 0 25268 2 1 1 1 0 8 1
knotepl 112 436 0 398 2 0 2 2 0 8 0
kqueuepl 184 1674 0 1667 1 0 1 1 0 8 0
pipepl 304 264 0 254 1 0 1 1 0 8 0
fdescpl 432 2941 0 2925 3 1 2 3 0 8 0
filepl 120 10563 0 10453 5 1 4 4 0 8 0
lockfpl 104 444 0 442 1 0 1 1 0 8 0
lockfspl 48 172 0 170 1 0 1 1 0 8 0
sessionpl 144 20 0 10 1 0 1 1 0 8 0
pgrppl 48 36 0 26 1 0 1 1 0 8 0
ucredpl 96 1408 0 1398 1 0 1 1 0 8 0
zombiepl 144 2925 0 2925 1 0 1 1 0 8 1
processpl 1008 2957 0 2925 5 0 5 5 0 8 0
procpl 672 5835 0 5796 4 0 4 4 0 8 0
sosppl 168 37 0 37 2 2 0 1 0 8 0
sockpl 448 1614 0 1590 6 2 4 4 0 8 0
mcl64k 65536 59 0 59 3 3 0 1 0 8 0
mcl16k 16384 52 0 52 6 6 0 1 0 8 0
mcl12k 12288 126 0 126 9 8 1 1 0 8 1
mcl9k 9216 27 0 27 5 5 0 1 0 8 0
mcl8k 8192 38 0 38 5 4 1 1 0 8 1
mcl4k 4096 142 0 142 8 7 1 1 0 8 1
mcl2k2 2112 18 0 18 3 3 0 1 0 8 0
mcl2k 2048 68055 0 67992 47 33 14 20 0 8 5
mtagpl 96 260 0 146 7 3 4 5 0 8 0
mbufpl 256 193247 0 192811 94 63 31 45 0 8 0
bufpl 280 7422 0 1015 458 0 458 458 0 8 0
anonpl 24 718491 0 707248 79 9 70 74 0 188 1
amapchunkpl 152 80678 0 80211 33 12 21 32 0 158 0
amappl16 200 5576 0 5225 22 3 19 22 0 8 0
amappl15 192 2176 0 2174 1 0 1 1 0 8 0
amappl14 184 218 0 214 1 0 1 1 0 8 0
amappl13 176 98 0 97 1 0 1 1 0 8 0
amappl12 168 2 0 1 1 0 1 1 0 8 0
amappl11 160 38 0 27 1 0 1 1 0 8 0
amappl10 152 127 0 122 1 0 1 1 0 8 0
amappl9 144 14 0 11 1 0 1 1 0 8 0
amappl8 136 638 0 584 2 0 2 2 0 8 0
amappl7 128 272 0 260 1 0 1 1 0 8 0
amappl6 120 142 0 125 1 0 1 1 0 8 0
amappl5 112 3153 0 3138 1 0 1 1 0 8 0
amappl4 104 860 0 835 1 0 1 1 0 8 0
amappl3 96 188 0 187 1 0 1 1 0 8 0
amappl2 88 548 0 492 2 0 2 2 0 8 0
amappl1 80 50904 0 50493 12 3 9 12 0 8 0
amappl 88 32865 0 32722 4 0 4 4 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 7 0 0 1 0 1 1 0 8 0
uaddrrnd 24 2956 0 2935 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2956 0 2935 1 0 1 1 0 8 0
vmmpekpl 168 19526 0 19505 2 0 2 2 0 8 0
vmmpepl 168 323489 0 321883 114 39 75 87 0 357 0
vmsppl 272 2955 0 2935 3 1 2 2 0 8 0
rwobjpl 24 56562 0 55504 7 0 7 7 0 8 0
pdppl 4096 5918 0 5875 71 26 45 47 0 8 2
pvpl 32 1553944 0 1539358 175 50 125 135 0 265 5
pmappl 192 2955 0 2935 2 0 2 2 0 8 1
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 446 0 155 9 0 9 9 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(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232
VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e
syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5f3645c90a0, count: -9
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8246be6e) at panic+0x161 sys/kern/subr_prf.c:202
rw_enter(ffff800024916a60,1) at rw_enter+0x36f sys/kern/kern_rwlock.c:174
vm_run(ffff8000216e1480) at vm_run+0x20f sys/arch/amd64/amd64/vmm.c:4232
VOP_IOCTL(fffffd806ec3dc90,c0205602,ffff8000216e1480,1,fffffd807f7d8900,ffff8000216687e0) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:295
vn_ioctl(fffffd806980f6a8,c0205602,ffff8000216e1480,ffff8000216687e0) at vn_ioctl+0xb5 sys/kern/vfs_vnops.c:531
sys_ioctl(ffff8000216687e0,ffff8000216e1598,ffff8000216e15f0) at sys_ioctl+0x49e
syscall(ffff8000216e1660) at syscall+0x571 sys/arch/amd64/amd64/trap.c:587
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x5f3645c90a0, count: -9


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