panic: vput: ref cnt

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 4e6b438a In let's encrypt v1 we had to track a challenge f..
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=17b1ea02600000
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=bf2ac4d4fa9ee92903b8

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+bf2ac4...@syzkaller.appspotmail.com

panic: vput: ref cnt
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*139615 95763 0 0 0x4000000 0K syz-executor.0
474345 89348 0 0 0x4000000 1 syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
vput(fffffd8064229230) at vput+0x14b sys/kern/vfs_subr.c:750
vn_close(fffffd8064229230,2,fffffd807f7c6ae0,ffff800020b28ee8) at
vn_close+0xfb sys/kern/vfs_vnops.c:291
sys_acct(ffff800020b28ee8,ffff800023c1fd98,ffff800023c1fe00) at
sys_acct+0x15b sys/kern/kern_acct.c:134
syscall(ffff800023c1fe70) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800023c1fe70) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,fffffffffffffec0,0,1,46ed7835010) at Xsyscall+0x128
end of kernel
end trace frame: 0x471740ac640, count: 8
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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
vput: ref cnt
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
vput(fffffd8064229230) at vput+0x14b sys/kern/vfs_subr.c:750
vn_close(fffffd8064229230,2,fffffd807f7c6ae0,ffff800020b28ee8) at
vn_close+0xfb sys/kern/vfs_vnops.c:291
sys_acct(ffff800020b28ee8,ffff800023c1fd98,ffff800023c1fe00) at
sys_acct+0x15b sys/kern/kern_acct.c:134
syscall(ffff800023c1fe70) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800023c1fe70) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,fffffffffffffec0,0,1,46ed7835010) at Xsyscall+0x128
end of kernel
end trace frame: 0x471740ac640, count: -7
ddb{0}> show registers
rdi 0xffffffff81e595e7 db_enter+0x17
rsi 0x388a __ALIGN_SIZE+0x288a
rbp 0xffff800023c1fb10
rbx 0xffff800023c1fbc0
rdx 0x388b __ALIGN_SIZE+0x288b
rcx 0xffff800022dfe000
rax 0xffff800022dfe000
r8 0xffffffff815a9073 kprintf+0x173
r9 0x1
r10 0x25
r11 0x5c0b6a115bd0bab5
r12 0x3000000008
r13 0xffff800023c1fb20
r14 0x100
r15 0x1
rip 0xffffffff81e595e8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800023c1fb00
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor.0) pid=139615 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=80, nice=20
forw=0xffffffffffffffff, list=0xffff800020b28508,0xffffffff8236fbe0
process=0xffff800020b7dc00 user=0xffff800023c1a000,
vmspace=0xfffffd807effe000
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
95763 114704 37296 0 2 0 syz-executor.0
*95763 139615 37296 0 7 0x4000000 syz-executor.0
89348 73266 54527 0 2 0 syz-executor.1
89348 474345 54527 0 7 0x4000000 syz-executor.1
68795 261507 0 0 3 0x14200 acct acct
54527 290176 38728 0 3 0x82 nanosleep syz-executor.1
37296 408344 38728 0 3 0x82 nanosleep syz-executor.0
15010 426321 0 0 3 0x14200 bored sosplice
38728 72209 73321 0 3 0x82 thrsleep syz-fuzzer
38728 443641 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 293438 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 490033 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 438938 73321 0 3 0x4000082 kqread syz-fuzzer
38728 310657 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 50619 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 506600 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 455001 73321 0 3 0x4000082 thrsleep syz-fuzzer
38728 6439 73321 0 3 0x4000082 thrsleep syz-fuzzer
73321 81622 36389 0 3 0x10008a pause ksh
36389 371481 34289 0 3 0x92 select sshd
94413 409169 1 0 3 0x100083 ttyin getty
34289 449007 1 0 3 0x80 select sshd
33816 139027 24207 74 3 0x100092 bpf pflogd
24207 25565 1 0 3 0x80 netio pflogd
35164 228700 6543 73 2 0x100090 syslogd
6543 339115 1 0 3 0x100082 netio syslogd
79801 432426 0 0 2 0x14200 zerothread
49207 500403 0 0 3 0x14200 aiodoned aiodoned
80635 455687 0 0 3 0x14200 syncer update
27251 418433 0 0 3 0x14200 cleaner cleaner
41555 230132 0 0 3 0x14200 reaper reaper
48474 229335 0 0 3 0x14200 pgdaemon pagedaemon
18176 465260 0 0 3 0x14200 bored crynlk
43376 172324 0 0 3 0x14200 bored crypto
11370 387969 0 0 3 0x40014200 acpi0 acpi0
46988 107312 0 0 3 0x40014200 idle1
78606 399952 0 0 3 0x14200 bored softnet
84812 282391 0 0 3 0x14200 bored systqmp
3539 463163 0 0 3 0x14200 bored systq
3129 108022 0 0 3 0x40014200 bored softclock
99413 88054 0 0 3 0x40014200 idle0
52278 487947 0 0 3 0x14200 bored smr
1 272276 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 95763 (syz-executor.0) thread 0xffff800020b28ee8 (139615)
exclusive rrwlock inode r = 0 (0xfffffd80641401b0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rw_enter+0x46d sys/kern/kern_rwlock.c:306
#2 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4 vn_close+0xb9 vn_lock sys/kern/vfs_vnops.c:561 [inline]
#4 vn_close+0xb9 sys/kern/vfs_vnops.c:288
#5 sys_acct+0x15b sys/kern/kern_acct.c:134
#6 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#6 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#7 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff823822f8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 __mp_acquire_count+0x51 sys/kern/kern_lock.c:227
#2 mi_switch+0x38f sys/kern/sched_bsd.c:441
#3 sleep_finish+0x113 sys/kern/kern_synch.c:373
#4 rw_enter+0x366 sys/kern/kern_rwlock.c:282
#5 rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#6 VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#7 vn_close+0xb9 vn_lock sys/kern/vfs_vnops.c:561 [inline]
#7 vn_close+0xb9 sys/kern/vfs_vnops.c:288
#8 sys_acct+0x15b sys/kern/kern_acct.c:134
#9 syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9 syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#10 Xsyscall+0x128
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9575 6374K 7250K 78643K 22990 0 0
pcb 13 8K 8K 78643K 690 0 0
rtable 112 12K 12K 78643K 1756 0 0
ifaddr 81 27K 35K 78643K 2060 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1811 0 0
iov 0 0K 28K 78643K 1012 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1201 75K 77K 78643K 6986 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 9K 78643K 51 0 0
VM map 2 1K 1K 78643K 2 0 0
sem 12 0K 0K 78643K 606 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 6 17K 25K 78643K 14670 0 0
sigio 0 0K 0K 78643K 55 0 0
proc 53 50K 83K 78643K 2555 0 0
subproc 32 2K 2K 78643K 170 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 512 0 0
in_multi 33 2K 2K 78643K 448 0 0
ether_multi 1 0K 0K 78643K 61 0 0
mrt 0 0K 0K 78643K 334 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 96 424K 424K 78643K 96 0 0
exec 0 0K 1K 78643K 1014 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 128 23K 39K 78643K 38911 0 0
UVM aobj 130 5K 5K 78643K 157 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 206 0 0
NDP 19 0K 1K 78643K 574 0 0
temp 222 2752K 2876K 78643K 618739 0 0
kqueue 0 0K 0K 78643K 190 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 25 0 19 1 0 1 1 0
8 0
plcache 128 20 0 0 1 0 1 1 0
8 0
rtpcb 80 251 0 251 10 10 0 1 0
8 0
rtentry 112 285 0 241 2 0 2 2 0
8 0
unpcb 120 1477 0 1469 1 0 1 1 0
8 0
syncache 264 4 0 4 1 1 0 1 0
8 0
tcpqe 32 166 0 166 12 12 0 1 0
8 0
tcpcb 544 789 0 785 1 0 1 1 0
8 0
inpcb 280 4427 0 4415 2 0 2 2 0
8 0
rttmr 72 143 0 143 6 6 0 1 0
8 0
nd6 48 31 0 25 1 0 1 1 0
8 0
pkpcb 40 25 0 25 4 4 0 1 0
8 0
swfcl 56 1 0 0 1 0 1 1 0
8 0
ppxss 1128 499 0 499 14 14 0 1 0
8 0
pffrag 232 3 0 3 1 1 0 1 0
482 0
pffrnode 88 3 0 3 1 1 0 1 0
8 0
pffrent 40 6 0 6 1 1 0 1 0
8 0
pfosfp 40 846 0 423 5 0 5 5 0
8 0
pfosfpen 112 1428 0 714 21 0 21 21 0
8 0
pfstitem 24 473 0 468 3 2 1 3 0
8 0
pfstkey 112 473 0 468 11 10 1 11 0
8 0
pfstate 328 473 0 468 31 30 1 30 0
8 0
pfrule 1360 21 0 16 2 1 1 2 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0
art_heap4 256 840 0 646 17 4 13 14 0
8 0
art_table 32 841 0 646 2 0 2 2 0
8 0
art_node 16 268 0 228 1 0 1 1 0
8 0
sysvmsgpl 40 22 0 0 1 0 1 1 0
8 0
semapl 112 604 0 594 1 0 1 1 0
8 0
shmpl 112 155 0 27 4 0 4 4 0
8 0
dirhash 1024 17 0 0 3 0 3 3 0
8 0
dino1pl 128 27093 0 25198 62 0 62 62 0
8 0
ffsino 272 27093 0 25198 128 1 127 127 0
8 0
nchpl 144 50945 0 49311 62 0 62 62 0
8 0
uvmvnodes 72 6902 0 0 126 0 126 126 0
8 0
vnodes 200 6902 0 0 364 0 364 364 0
8 0
namei 1024 135230 0 135230 3 2 1 1 0
8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0
scsiplug 64 17 0 17 6 6 0 1 0
8 0
scxspl 192 141810 0 141810 36 35 1 6 0
8 1
plimitpl 152 430 0 423 1 0 1 1 0
8 0
sigapl 432 14846 0 14832 3 1 2 3 0
8 0
futexpl 56 112498 0 112498 2 1 1 1 0
8 1
knotepl 112 1286 0 1267 1 0 1 1 0
8 0
kqueuepl 104 1329 0 1327 1 0 1 1 0
8 0
pipepl 112 3300 0 3281 3 2 1 2 0
8 0
fdescpl 488 14847 0 14832 3 0 3 3 0
8 0
filepl 152 60369 0 60278 20 16 4 6 0
8 0
lockfpl 104 3875 0 3875 17 16 1 1 0
8 1
lockfspl 48 1309 0 1309 17 16 1 1 0
8 1
sessionpl 112 26 0 17 1 0 1 1 0
8 0
pgrppl 48 92 0 83 1 0 1 1 0
8 0
ucredpl 96 9841 0 9833 1 0 1 1 0
8 0
zombiepl 144 14840 0 14840 2 1 1 1 0
8 1
processpl 896 14872 0 14840 4 0 4 4 0
8 0
procpl 632 37534 0 37491 20 16 4 5 0
8 0
srpgc 64 137 0 137 10 10 0 1 0
8 0
sosppl 128 80 0 80 6 5 1 1 0
8 1
sockpl 384 6218 0 6206 14 12 2 4 0
8 0
mcl64k 65536 511 0 0 64 13 51 64 0
8 1
mcl16k 16384 23 0 0 3 1 2 3 0
8 0
mcl12k 12288 25 0 0 2 0 2 2 0
8 0
mcl9k 9216 33 0 0 3 1 2 2 0
8 0
mcl8k 8192 33 0 0 4 1 3 3 0
8 0
mcl4k 4096 17 0 0 3 0 3 3 0
8 0
mcl2k2 2112 9 0 0 1 0 1 1 0
8 0
mcl2k 2048 346 0 0 12 3 9 12 0
8 0
mtagpl 80 83 0 0 2 0 2 2 0
8 0
mbufpl 256 1030 0 0 43 0 43 43 0
8 0
bufpl 256 47424 0 40395 440 0 440 440 0
8 0
anonpl 16 1060739 0 1055404 184 161 23 50 0
125 0
amapchunkpl 152 64439 0 64351 36 32 4 14 0
158 0
amappl16 192 64784 0 64521 144 130 14 31 0
8 0
amappl15 184 3964 0 3963 3 2 1 1 0
8 0
amappl14 176 6444 0 6438 1 0 1 1 0
8 0
amappl13 168 153 0 153 2 2 0 1 0
8 0
amappl12 160 6105 0 6102 1 0 1 1 0
8 0
amappl11 152 611 0 600 1 0 1 1 0
8 0
amappl10 144 499 0 492 1 0 1 1 0
8 0
amappl9 136 1558 0 1554 1 0 1 1 0
8 0
amappl8 128 1202 0 1150 2 0 2 2 0
8 0
amappl7 120 481 0 471 1 0 1 1 0
8 0
amappl6 112 577 0 566 1 0 1 1 0
8 0
amappl5 104 6402 0 6390 1 0 1 1 0
8 0
amappl4 96 9197 0 9163 2 1 1 2 0
8 0
amappl3 88 8958 0 8948 1 0 1 1 0
8 0
amappl2 80 120449 0 120370 3 1 2 3 0
8 0
amappl1 72 282456 0 282033 26 16 10 20 0
8 0
amappl 80 37945 0 37911 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
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 64 156 0 27 3 0 3 3 0
8 0
uaddrrnd 24 14847 0 14832 1 0 1 1 0
8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0
uaddr 24 14847 0 14832 1 0 1 1 0
8 0
vmmpekpl 168 74822 0 74793 2 0 2 2 0
8 0
vmmpepl 168 1700644 0 1699183 197 131 66 81 0
357 0
vmsppl 368 14846 0 14832 2 0 2 2 0
8 0
pdppl 4096 29702 0 29664 6 0 6 6 0
8 0
pvpl 32 3272140 0 3263572 418 348 70 130 0
265 0
pmappl 232 14846 0 14832 2 1 1 2 0
8 0
extentpl 40 41 0 26 1 0 1 1 0
8 0
phpool 112 734 0 28 21 0 21 21 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]

syzbot has found a reproducer for the following crash on:

HEAD commit: 4e6b438a In let's encrypt v1 we had to track a challenge f..
git tree: openbsd

console output: https://syzkaller.appspot.com/x/log.txt?x=1671ea02600000

kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
dashboard link: https://syzkaller.appspot.com/bug?extid=bf2ac4d4fa9ee92903b8

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16605bc2600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10d18d1c600000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+bf2ac4...@syzkaller.appspotmail.com

panic: vput: ref cnt
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND

*307047 84887 0 0 0 0K syz-executor7760
79340 3092 0 0 0 1 syz-executor7760

db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207

vput(fffffd8076dcb268) at vput+0x14b sys/kern/vfs_subr.c:750
vn_close(fffffd8076dcb268,2,fffffd807f7c6ae0,ffff800020afe9e8) at
vn_close+0xfb sys/kern/vfs_vnops.c:291
sys_acct(ffff800020afe9e8,ffff800020bc3988,ffff800020bc39f0) at
sys_acct+0x15b sys/kern/kern_acct.c:134
syscall(ffff800020bc3a60) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020bc3a60) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,2,0,431bde82d7b634db,7f7fffff78b0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffff7910, count: 8

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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
vput: ref cnt
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207

vput(fffffd8076dcb268) at vput+0x14b sys/kern/vfs_subr.c:750
vn_close(fffffd8076dcb268,2,fffffd807f7c6ae0,ffff800020afe9e8) at
vn_close+0xfb sys/kern/vfs_vnops.c:291
sys_acct(ffff800020afe9e8,ffff800020bc3988,ffff800020bc39f0) at
sys_acct+0x15b sys/kern/kern_acct.c:134
syscall(ffff800020bc3a60) at syscall+0x552 mi_syscall
sys/sys/syscall_mi.h:92 [inline]
syscall(ffff800020bc3a60) at syscall+0x552 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,2,0,431bde82d7b634db,7f7fffff78b0) at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7fffff7910, count: -7

ddb{0}> show registers
rdi 0

rsi 0x1
rbp 0xffff800020bc3700
rbx 0xffff800020bc37b0
rdx 0x8b
rcx 0x2
rax 0x1

r8 0xffffffff815a9073 kprintf+0x173
r9 0x1

r10 0x277b1cf6cdabbe2
r11 0xe9d34a32f11cd0f0
r12 0x3000000008
r13 0xffff800020bc3710

r14 0x100
r15 0x1
rip 0xffffffff81e595e8 db_enter+0x18
cs 0x8
rflags 0x246

rsp 0xffff800020bc36f0

ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc

PROC (syz-executor7760) pid=307047 stat=onproc
flags process=0 proc=0
pri=32, usrpri=53, nice=20
forw=0xffffffffffffffff, list=0xffff800020afe008,0xffffffff8236fbe0
process=0xffff800020b7d180 user=0xffff800020bbe000,
vmspace=0xfffffd807effe000
estcpu=12, cpticks=1, pctcpu=0.0

user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND

*84887 307047 5211 0 7 0 syz-executor7760
3092 79340 60010 0 7 0 syz-executor7760
3591 52504 0 0 3 0x14200 acct acct
60010 292771 79806 0 3 0x80 nanosleep syz-executor7760
5211 59744 79806 0 3 0x80 nanosleep syz-executor7760
79806 471208 93309 0 3 0x82 nanosleep syz-executor7760
93309 115215 35169 0 3 0x10008a pause ksh
35169 453254 44798 0 3 0x92 select sshd
27835 84376 1 0 3 0x100083 ttyin getty
44798 442806 1 0 3 0x80 select sshd
59938 160657 20544 74 3 0x100092 bpf pflogd
20544 458131 1 0 3 0x80 netio pflogd
43275 503730 75348 73 2 0x100090 syslogd
75348 354477 1 0 3 0x100082 netio syslogd
55480 396975 1 77 3 0x100090 poll dhclient
6226 429921 1 0 3 0x80 poll dhclient
65912 3220 0 0 3 0x14200 pgzero zerothread
16012 86214 0 0 3 0x14200 aiodoned aiodoned
13817 49093 0 0 3 0x14200 syncer update
77691 264412 0 0 3 0x14200 cleaner cleaner
65480 444097 0 0 3 0x14200 reaper reaper
13029 68349 0 0 3 0x14200 pgdaemon pagedaemon
62993 479602 0 0 3 0x14200 bored crynlk
62871 64701 0 0 3 0x14200 bored crypto
67644 376495 0 0 3 0x40014200 acpi0 acpi0
77362 139830 0 0 3 0x40014200 idle1
11434 508851 0 0 3 0x14200 bored softnet
69668 356425 0 0 3 0x14200 bored systqmp
54868 194131 0 0 3 0x14200 bored systq
9257 74611 0 0 3 0x40014200 bored softclock
20404 310548 0 0 3 0x40014200 idle0
96199 102066 0 0 3 0x14200 bored smr
1 49464 0 0 3 0x82 wait init

0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks

Process 84887 (syz-executor7760) thread 0xffff800020afe9e8 (307047)
exclusive rrwlock inode r = 0 (0xfffffd806d9ff3d8)

devbuf 9452 6383K 6384K 78643K 10539 0 0
pcb 13 8K 8K 78643K 13 0 0
rtable 61 2K 2K 78643K 126 0 0
ifaddr 25 7K 7K 78643K 26 0 0

counters 39 33K 33K 78643K 39 0 0

ioctlops 0 0K 4K 78643K 1467 0 0

mount 1 1K 1K 78643K 1 0 0

vnodes 1181 74K 74K 78643K 1186 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 1808 196K 290K 78643K 12765 0 0

file desc 1 0K 0K 78643K 1 0 0
proc 52 50K 58K 78643K 334 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 179 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 66 3K 4K 78643K 825 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 4 0K 0K 78643K 4 0 0
temp 39 2732K 2796K 78643K 2004 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
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
rtentry 112 23 0 1 1 0 1 1 0
8 0
unpcb 120 29 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 29 0 23 1 0 1 1 0
8 0

pfosfp 40 846 0 423 5 0 5 5 0
8 0
pfosfpen 112 1428 0 714 21 0 21 21 0
8 0

pfstitem 24 8 0 2 1 0 1 1 0
8 0
pfstkey 112 8 0 2 1 0 1 1 0
8 0
pfstate 328 8 0 2 1 0 1 1 0

8 0
pfrule 1360 21 0 16 2 1 1 2 0
8 0
art_heap8 4096 1 0 0 1 0 1 1 0
8 0

art_heap4 256 97 0 0 7 0 7 7 0
8 0
art_table 32 98 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 1414 0 25 45 0 45 45 0
8 0
ffsino 272 1414 0 25 93 0 93 93 0
8 0
nchpl 144 1613 0 63 58 0 58 58 0
8 0
uvmvnodes 72 1424 0 0 26 0 26 26 0
8 0
vnodes 200 1424 0 0 75 0 75 75 0
8 0
namei 1024 3805 0 3805 2 1 1 1 0

8 1
percpumem 16 30 0 0 1 0 1 1 0
8 0

scxspl 192 2522 0 2522 8 7 1 6 0
8 1
plimitpl 152 14 0 8 1 0 1 1 0
8 0
sigapl 432 213 0 197 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 112 134 0 127 2 1 1 1 0
8 0
fdescpl 488 214 0 197 3 0 3 3 0
8 0
filepl 152 993 0 944 2 0 2 2 0
8 0
lockfpl 104 6 0 6 1 1 0 1 0
8 0
lockfspl 48 3 0 3 1 1 0 1 0
8 0
sessionpl 112 18 0 9 1 0 1 1 0
8 0
pgrppl 48 18 0 9 1 0 1 1 0
8 0
ucredpl 96 52 0 43 1 0 1 1 0
8 0
zombiepl 144 197 0 197 2 1 1 1 0
8 1
processpl 896 230 0 197 4 0 4 4 0
8 0
procpl 632 230 0 197 3 0 3 3 0
8 0
sockpl 384 73 0 55 2 0 2 2 0
8 0
mcl4k 4096 3 0 0 1 0 1 1 0
8 0
mcl2k 2048 86 0 0 9 0 9 9 0
8 0
mtagpl 80 1 0 0 1 0 1 1 0
8 0
mbufpl 256 105 0 0 6 0 6 6 0
8 0
bufpl 256 2177 0 276 119 0 119 119 0
8 0
anonpl 16 20274 0 18988 7 1 6 7 0
125 0
amapchunkpl 152 545 0 504 2 0 2 2 0
158 0
amappl16 192 91 0 81 1 0 1 1 0
8 0
amappl14 176 38 0 34 1 0 1 1 0
8 0
amappl12 160 10 0 10 2 1 1 1 0
8 1
amappl11 152 51 0 36 1 0 1 1 0
8 0
amappl10 144 56 0 54 1 0 1 1 0
8 0
amappl9 136 426 0 425 1 0 1 1 0
8 0
amappl8 128 100 0 96 1 0 1 1 0
8 0
amappl7 120 21 0 20 1 0 1 1 0
8 0
amappl6 112 47 0 42 1 0 1 1 0
8 0
amappl5 104 145 0 129 1 0 1 1 0
8 0
amappl4 96 466 0 442 1 0 1 1 0
8 0
amappl3 88 158 0 147 1 0 1 1 0
8 0
amappl2 80 770 0 712 2 0 2 2 0
8 0
amappl1 72 13806 0 13375 15 5 10 15 0
8 0
amappl 80 429 0 404 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
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 24 214 0 197 1 0 1 1 0

8 0
uaddrbest 32 2 0 0 1 0 1 1 0
8 0

uaddr 24 214 0 197 1 0 1 1 0
8 0
vmmpekpl 168 5628 0 5607 2 0 2 2 0
8 0
vmmpepl 168 29589 0 28653 51 10 41 47 0
357 0
vmsppl 368 213 0 197 2 0 2 2 0
8 0
pdppl 4096 436 0 394 6 0 6 6 0
8 0
pvpl 32 80908 0 77796 32 4 28 28 0
265 1
pmappl 232 213 0 197 1 0 1 1 0
8 0

extentpl 40 41 0 26 1 0 1 1 0
8 0

phpool 112 254 0 4 8 0 8 8 0
8 0

[Anton Lindqvist]

#syz test: https://github.com/mptre/openbsd-src acct

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger
crash:

Reported-and-tested-by:
syzbot+bf2ac4...@syzkaller.appspotmail.com

Tested on:

commit: 487e837b potential acct fix
git tree: https://github.com/mptre/openbsd-src acct
kernel config: https://syzkaller.appspot.com/x/.config?x=26ca0a9c07f16a3a
compiler:

Note: testing is done by a robot and is best-effort only.

[Dmitry Vyukov]

That was fast. All of: first acct bug and the fix :)

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[Anton Lindqvist]

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger
crash:

Reported-and-tested-by:
syzbot+bf2ac4...@syzkaller.appspotmail.com

Tested on:

commit: 30b83c15 potential acct fix using a dedicated lock