Hello,
syzbot found the following issue on:
HEAD commit: c58a321e760c Align the filesystem modification times of th..
git tree: openbsd
console output:
https://syzkaller.appspot.com/x/log.txt?x=12c1d258580000
kernel config:
https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link:
https://syzkaller.appspot.com/bug?extid=89d36c350dc9849653e3
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/82c8707a4c97/disk-c58a321e.raw.xz
bsd.gdb:
https://storage.googleapis.com/syzbot-assets/1106c6fb13e5/bsd-c58a321e.gdb.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/b3937438ca96/kernel-c58a321e.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+89d36c...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "pr->ps_threadcnt == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_exit.c", line 886
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*300185 36858 0 0x14000 0x200 0 reaper
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833573e1) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff83396e6c,ffffffff833bcb9f,376,ffffffff833bcbd4) at __assert+0x29 sys/kern/subr_prf.c:-1
process_zap(ffff80002a794908) at process_zap+0x31d sys/kern/kern_exit.c:887
reaper(ffff80002a73cf90) at reaper+0x270 sys/kern/kern_exit.c:521
end trace frame: 0x0, count: 10
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: kernel diagnostic assertion "pr->ps_threadcnt == 0" failed: file "/syzkaller/managers/main/kernel/sys/kern/kern_exit.c", line 886
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833573e1) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff83396e6c,ffffffff833bcb9f,376,ffffffff833bcbd4) at __assert+0x29 sys/kern/subr_prf.c:-1
process_zap(ffff80002a794908) at process_zap+0x31d sys/kern/kern_exit.c:887
reaper(ffff80002a73cf90) at reaper+0x270 sys/kern/kern_exit.c:521
end trace frame: 0x0, count: -5
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a772eb0
rbx 0x40000 acpi_pdirpa+0x2be71
rdx 0
rcx 0
rax 0xffff80002a73cf90
r8 0x101010101010101
r9 0x8080808080808080
r10 0xa46aadc94e38b4c1
r11 0xefea816a0e783291
r12 0
r13 0
r14 0
r15 0x1
rip 0xffffffff81f891b5 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80002a772ea0
ss 0x10
db_enter+0x25: addq $0x8,%rsp
ddb> show proc
PROC (reaper) tid=300185 pid=36858 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=51, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a73c7c8,0xffff80002a73d4d0
process=0xffff8000ffffd680 user=0xffff80002a76e000, vmspace=0xffffffff83874608
estcpu=1, cpticks=7, pctcpu=0.1, user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
3390 399297 15555 0 2 0 syz-executor
3390 514304 15555 0 2 0x4000000 syz-executor
87011 39586 27874 0 2 0 syz-executor
87011 203707 27874 0 3 0x4000080 fsleep syz-executor
98032 105382 0 0 3 0x14280 nfsidl nfsio
75033 120168 0 0 3 0x14280 nfsidl nfsio
36421 34826 0 0 3 0x14280 nfsidl nfsio
15466 279640 0 0 3 0x14280 nfsidl nfsio
42480 482055 0 0 3 0x14280 nfsidl nfsio
99170 50840 0 0 3 0x14280 nfsidl nfsio
77921 380113 0 0 3 0x14280 nfsidl nfsio
36540 172545 0 0 3 0x14280 nfsidl nfsio
90318 56096 0 0 3 0x14280 nfsidl nfsio
72303 167199 85082 0 2 0 syz-executor
72303 345696 85082 0 3 0x4000080 sysctllk syz-executor
72303 96440 85082 0 2 0x4000000 syz-executor
47786 103541 0 0 3 0x14280 nfsidl nfsio
1607 173968 0 0 3 0x14280 nfsidl nfsio
56054 520392 0 0 3 0x14280 nfsidl nfsio
75663 108119 29837 0 2 0xc80 syz-executor
75663 510790 29837 0 3 0x4000080 sysctllk syz-executor
95648 17745 33120 0 2 0xc80 syz-executor
95648 84277 33120 0 3 0x4000080 nanoslp syz-executor
95648 518701 33120 0 3 0x4000080 fsleep syz-executor
52971 511760 86079 0 3 0x3000 suspend syz-executor
52971 463374 86079 0 2 0x4081000 syz-executor
15555 137324 41689 0 3 0x2 kqpsl syz-executor
50128 212493 1 0 3 0x100083 ttyin getty
38892 100305 0 0 3 0x14200 acct acct
37925 177304 0 0 3 0x14280 nfsidl nfsio
43778 45773 0 0 3 0x14280 nfsidl nfsio
11604 375485 0 0 3 0x14280 nfsidl nfsio
53042 307387 0 0 3 0x14280 nfsidl nfsio
29837 176790 41689 0 3 0x82 nanoslp syz-executor
33120 409668 41689 0 3 0x82 nanoslp syz-executor
85082 95613 41689 0 3 0x82 nanoslp syz-executor
61937 150470 41689 0 2 0x2 syz-executor
27874 193278 41689 0 2 0x2 syz-executor
49773 402342 41689 0 3 0x82 wait syz-executor
86079 418848 41689 0 3 0x82 nanoslp syz-executor
41689 79222 24502 0 2 0x2 syz-executor
24502 465481 58886 0 3 0x10008a sigsusp ksh
58886 261452 29556 0 3 0x98 kqread sshd-session
29556 417639 13196 0 3 0x92 kqread sshd-session
13196 455658 1 0 3 0x88 kqread sshd
9692 78211 29830 73 3 0x1100090 kqread syslogd
29830 489143 1 0 3 0x100082 sbwait syslogd
80889 88991 1 0 3 0x100080 kqread resolvd
26175 185405 41170 77 3 0x100092 kqread dhcpleased
19638 24713 41170 77 3 0x100092 kqread dhcpleased
41170 419862 1 0 3 0x80 kqread dhcpleased
20026 3942 0 0 3 0x14200 bored smr
7773 269134 0 0 2 0x14200 zerothread
65400 28736 0 0 3 0x14200 aiodoned aiodoned
11338 125442 0 0 3 0x14200 syncer update
52886 252790 0 0 3 0x14200 cleaner cleaner
*36858 300185 0 0 7 0x14200 reaper
40912 521489 0 0 3 0x14200 pgdaemon pagedaemon
53970 406292 0 0 3 0x14200 bored viomb
89100 340222 0 0 3 0x40014200 acpi0 acpi0
33300 415087 0 0 3 0x14200 bored softnet0
69992 85487 0 0 3 0x14200 bored systqmp
26877 222668 0 0 3 0x14200 bored systq
34166 136463 0 0 3 0x40014200 tmoslp softclock
93552 67943 0 0 3 0x40014200 idle0
1 197577 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10202 11045K 11365K 166960K 11982 0
pcb 17 14K 16K 166960K 293 0
rtable 222 8K 8K 166960K 479 0
pf 31 13K 18K 166960K 185 0
ifaddr 41 7K 7K 166960K 86 0
ifgroup 50 2K 2K 166960K 131 0
sysctl 4 1K 9K 166960K 8 0
counters 32 17K 18K 166960K 77 0
ioctlops 0 0K 4K 166960K 401 0
iov 0 0K 16K 166960K 44 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1463 92K 92K 166960K 1917 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 13 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 27 0
dirhash 12 2K 2K 166960K 24 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 93K 166960K 799 0
sigio 0 0K 0K 166960K 15 0
proc 60 59K 83K 166960K 611 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 72 0
in_multi 100 7K 7K 166960K 141 0
ether_multi 1 0K 0K 166960K 9 0
mrt 1 0K 0K 166960K 8 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 247 1102K 1102K 166960K 247 0
exec 0 0K 1K 166960K 441 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 240 144K 157K 166960K 9121 0
UVM aobj 22 2K 4K 166960K 26 0
pinsyscall 38 76K 92K 166960K 1884 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 34 0
NDP 11 0K 1K 166960K 57 0
temp 63 8648K 8723K 166960K 40978 0
kqueue 17 24K 28K 166960K 174 0
SYN cache 2 16K 16K 166960K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 101 0 97 1 0 1 1 0 8 0
rtentry 136 146 0 52 4 0 4 4 0 8 0
unpcb 144 494 0 479 6 5 1 6 0 8 0
syncache 336 4 0 4 1 1 0 1 0 8 0
tcpcb 736 240 0 236 7 6 1 7 0 8 0
arp 96 24 0 8 1 0 1 1 0 8 0
ipq 40 1 0 0 1 0 1 1 0 8 0
ipqe 40 2 0 0 1 0 1 1 0 8 0
inpcb 328 717 0 710 13 6 7 7 0 8 6
ip6q 72 6 0 2 1 0 1 1 0 8 0
ip6af 40 8 0 4 1 0 1 1 0 8 0
nd6 112 28 0 4 1 0 1 1 0 8 0
pkpcb 40 4 0 4 2 1 1 1 0 8 1
kcovpl 48 9 0 1 1 0 1 1 0 8 0
mppekey 1024 1 0 1 1 1 0 1 0 8 0
ppxss 1072 37 0 37 2 1 1 1 0 8 1
pppxif 1384 5 0 5 2 1 1 1 0 8 1
pfstscr 40 1 0 1 1 0 1 1 0 8 1
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pftag 88 1 0 0 1 0 1 1 0 8 0
pfstkey 128 1 0 1 1 0 1 1 0 8 1
pfstate 384 1 0 1 1 0 1 1 0 8 1
pfrule 1344 4 0 3 2 1 1 1 0 8 0
art_heap8 4096 3 0 0 3 0 3 3 0 8 0
art_heap4 256 605 0 172 30 1 29 30 0 8 1
art_table 40 608 0 172 5 0 5 5 0 8 0
art_node 32 144 0 60 1 0 1 1 0 8 0
sysvmsgpl 40 13 0 9 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 24 0 14 1 0 1 1 0 8 0
shmpl 112 23 0 4 1 0 1 1 0 8 0
dirhash 1024 25 0 8 3 0 3 3 0 8 0
dino2pl 256 2861 0 1361 95 0 95 95 0 8 0
ffsino 256 2861 0 1361 95 0 95 95 0 8 0
nchpl 144 4017 0 2327 64 0 64 64 0 8 0
rtmask 32 8 0 8 2 1 1 1 0 8 1
vnodes 216 3234 0 0 180 0 180 180 0 8 0
namei 1024 13779 0 13777 5 2 3 3 0 8 2
kstatmem 264 78 0 56 2 0 2 2 0 8 0
scsiplug 72 4 0 4 2 1 1 1 0 8 1
scxspl 216 12560 0 12560 10 2 8 8 1 8 8
plimitpl 152 263 0 247 1 0 1 1 0 8 0
sigapl 424 1114 0 1055 8 0 8 8 0 8 1
knotepl 120 75965 0 75902 23 13 10 15 0 8 8
kqueuepl 184 245 0 233 1 0 1 1 0 8 0
pipepl 304 306 0 279 10 0 10 10 0 8 7
fdescpl 448 1067 0 1038 5 1 4 5 0 8 0
filepl 120 6668 0 6454 17 4 13 13 0 8 4
lockfpl 104 293 0 291 2 1 1 2 0 8 0
lockfspl 48 129 0 127 1 0 1 1 0 8 0
sessionpl 144 24 0 16 1 0 1 1 0 8 0
pgrppl 48 42 0 25 1 0 1 1 0 8 0
ucredpl 104 932 0 920 1 0 1 1 0 8 0
zombiepl 144 1366 0 1364 1 0 1 1 0 8 0
processpl 1152 1114 0 1055 5 0 5 5 0 8 0
procpl 664 2282 0 2215 9 0 9 9 0 8 1
sosppl 176 2 0 2 1 0 1 1 0 8 1
sockpl 552 1337 0 1311 18 10 8 13 0 8 5
mcl64k 65536 98 0 96 1 0 1 1 0 8 0
mcl12k 12288 1 0 1 1 0 1 1 0 8 1
mcl9k 9216 1 0 1 1 1 0 1 0 8 0
mcl8k 8192 13 0 13 2 1 1 1 0 8 1
mcl4k 4096 3367 0 3317 14 6 8 13 0 8 1
mcl2k 2048 1142 0 1134 4 1 3 3 0 8 2
mtagpl 96 5 0 5 1 0 1 1 0 8 1
mbufpl 256 10919 0 10739 14 0 14 14 0 8 1
bufpl 280 3851 0 118 267 0 267 267 0 8 0
anonpl 24 180778 0 176476 58 20 38 48 0 187 6
amapchunkpl 152 30146 0 29611 35 7 28 28 0 158 5
amappl16 200 3210 0 3148 16 12 4 15 0 8 0
amappl15 192 19 0 19 1 1 0 1 0 8 0
amappl14 184 11 0 11 1 1 0 1 0 8 0
amappl13 176 418 0 416 1 0 1 1 0 8 0
amappl12 168 1419 0 1381 2 0 2 2 0 8 0
amappl11 160 10 0 10 1 1 0 1 0 8 0
amappl10 152 46 0 36 1 0 1 1 0 8 0
amappl9 144 254 0 253 1 0 1 1 0 8 0
amappl8 136 37 0 35 1 0 1 1 0 8 0
amappl7 128 94 0 93 1 0 1 1 0 8 0
amappl6 120 342 0 330 1 0 1 1 0 8 0
amappl5 112 71 0 64 1 0 1 1 0 8 0
amappl4 104 395 0 373 1 0 1 1 0 8 0
amappl3 96 5159 0 5064 3 0 3 3 0 8 0
amappl2 88 1182 0 1112 2 0 2 2 0 8 0
amappl1 80 11475 0 10939 13 1 12 13 0 8 0
amappl 88 8303 0 8132 5 0 5 5 0 92 0
uvmvnodes 80 3233 0 0 66 0 66 66 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 2 0 1 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 7 0 7 2 1 1 1 0 8 1
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 72 25 0 4 1 0 1 1 0 8 0
uaddrrnd 24 1067 0 1038 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1067 0 1038 1 0 1 1 0 8 0
vmmpekpl 168 10679 0 10636 3 0 3 3 0 8 0
vmmpepl 168 73544 0 71709 94 11 83 92 0 357 0
vmsppl 368 1066 0 1038 4 1 3 4 0 8 0
rwobjpl 40 24635 0 20497 42 0 42 42 0 8 0
pdppl 4096 2140 0 2076 102 34 68 80 0 8 4
pvpl 32 476550 0 465815 133 28 105 120 0 265 13
pmappl 216 1066 0 1038 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 389 0 57 10 0 10 10 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833573e1) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff83396e6c,ffffffff833bcb9f,376,ffffffff833bcbd4) at __assert+0x29 sys/kern/subr_prf.c:-1
process_zap(ffff80002a794908) at process_zap+0x31d sys/kern/kern_exit.c:887
reaper(ffff80002a73cf90) at reaper+0x270 sys/kern/kern_exit.c:521
end trace frame: 0x0, count: -5
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff833573e1) at panic+0x1cf sys/kern/subr_prf.c:198
__assert(ffffffff83396e6c,ffffffff833bcb9f,376,ffffffff833bcbd4) at __assert+0x29 sys/kern/subr_prf.c:-1
process_zap(ffff80002a794908) at process_zap+0x31d sys/kern/kern_exit.c:887
reaper(ffff80002a73cf90) at reaper+0x270 sys/kern/kern_exit.c:521
end trace frame: 0x0, count: -5
---
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