protection_fault: mtx_enter (4)

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May 8, 2026, 5:56:35 PM (11 days ago) May 8
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Hello,

syzbot found the following issue on:

HEAD commit: 34e7bded0e8b remove unused plic.h; ok kettenis@
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=156d0950580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=4ea0b44b8100f54f8414

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/48b05fe1a486/disk-34e7bded.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/9abb5dcd8429/bsd-34e7bded.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9e50bc742ed6/kernel-34e7bded.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4ea0b4...@syzkaller.appspotmail.com

kernel: protection fault trap, code=0
Stopped at mtx_enter+0x6e: movq 0(%r14),%r15
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
mtx_enter(deadbeefdeadbfcf) at mtx_enter+0x6e sys/kern/kern_lock.c:549
prsignal(deadbeefdeadbeef,14) at prsignal+0x36 sys/kern/kern_sig.c:904
reaper(ffff80002a6fd228) at reaper+0x2bc sys/kern/kern_exit.c:516
end trace frame: 0x0, count: -3
ddb> show registers
rdi 0
rsi 0
rbp 0xffff80002a733380
rbx 0x40000 acpi_pdirpa+0x2be71
rdx 0
rcx 0xffffffff83875ff0 cpu_info_full_primary+0x1ff0
rax 0xffff80002a6fd200
r8 0xffffffffffffffff
r9 0
r10 0xfd43712cc8965fc4
r11 0x5a5f0c95c443178
r12 0xdeadbeefdeadbeef
r13 0x40000 acpi_pdirpa+0x2be71
r14 0xdeadbeefdeadbfcf
r15 0
rip 0xffffffff81b963fe mtx_enter+0x6e
cs 0x8
rflags 0x10297 __ALIGN_SIZE+0xf297
rsp 0xffff80002a733350
ss 0x10
mtx_enter+0x6e: movq 0(%r14),%r15
ddb> show proc
PROC (reaper) tid=253937 pid=53247 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=0xffff80002a6fccf8,0xffff80002a6fd768
process=0xffff8000ffffc000 user=0xffff80002a72e000, vmspace=0xffffffff839ce6b0
estcpu=1, cpticks=5, pctcpu=0.0, user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
89020 360336 0 0 3 0x14280 nfsidl nfsio
17437 469402 0 0 3 0x14280 nfsidl nfsio
24938 451546 0 0 3 0x14280 nfsidl nfsio
27517 285890 0 0 3 0x14280 nfsidl nfsio
18237 278420 0 0 3 0x14280 nfsidl nfsio
46717 30991 0 0 3 0x14280 nfsidl nfsio
34518 184388 0 0 3 0x14280 nfsidl nfsio
8399 431579 0 0 3 0x14280 nfsidl nfsio
57107 364950 69809 0 2 0 syz-executor
57107 389951 69809 0 2 0x4000000 syz-executor
57107 56171 69809 0 2 0x4000000 syz-executor
63296 103758 0 0 3 0x14280 nfsidl nfsio
44128 321050 0 0 3 0x14280 nfsidl nfsio
37500 99406 0 0 3 0x14280 nfsidl nfsio
80785 366091 0 0 3 0x14280 nfsidl nfsio
46291 119639 0 0 3 0x14280 nfsidl nfsio
32230 57839 0 0 3 0x14280 nfsidl nfsio
36726 63019 0 0 3 0x14280 nfsidl nfsio
53229 478492 0 0 3 0x14280 nfsidl nfsio
97146 250448 0 0 3 0x14280 nfsidl nfsio
8615 177382 0 0 3 0x14280 nfsidl nfsio
7652 495317 0 0 3 0x14280 nfsidl nfsio
19169 282498 12386 0 3 0x80 nanoslp syz-executor
19169 1406 12386 0 2 0x4000000 syz-executor
19169 135140 12386 0 2 0x4000000 syz-executor
7639 218438 21356 0 2 0 syz-executor
7639 236629 21356 0 3 0x4000080 fsleep syz-executor
7639 289679 21356 0 2 0x4000000 syz-executor
90012 359934 19701 0 2 0x10 syz-executor
90012 16843 19701 0 2 0x4000010 syz-executor
90012 179328 19701 0 3 0x4000090 fsleep syz-executor
94963 494036 44315 0 2 0 syz-executor
94963 480545 44315 0 3 0x4000080 fsleep syz-executor
94963 27599 44315 0 2 0x4000000 syz-executor
29887 490272 7085 0 2 0 syz-executor
29887 403024 7085 0 3 0x4000080 fsleep syz-executor
7085 80917 34898 0 3 0x82 nanoslp syz-executor
94593 301624 0 0 3 0x14200 acct acct
21356 518753 34898 0 3 0x82 nanoslp syz-executor
19701 295795 34898 0 3 0x82 nanoslp syz-executor
44315 91428 34898 0 3 0x82 nanoslp syz-executor
69809 67599 34898 0 3 0x82 nanoslp syz-executor
20919 187363 34898 0 2 0x2 syz-executor
94348 32200 34898 0 2 0x2 syz-executor
12386 493487 34898 0 3 0x82 nanoslp syz-executor
34898 174770 79416 0 3 0x82 kqread syz-executor
79416 204515 16795 0 3 0x10008a sigsusp ksh
16795 42512 36388 0 3 0x98 kqread sshd-session
36388 473308 31216 0 3 0x92 kqread sshd-session
35243 54528 1 0 3 0x100083 ttyin getty
31216 70768 1 0 3 0x88 kqread sshd
74893 462403 23527 73 3 0x1100090 kqread syslogd
23527 271321 1 0 3 0x100082 sbwait syslogd
49006 31542 1 0 3 0x100080 kqread resolvd
75116 347053 50425 77 3 0x100092 kqread dhcpleased
78287 1105 50425 77 3 0x100092 kqread dhcpleased
50425 438280 1 0 3 0x80 kqread dhcpleased
32464 13484 0 0 3 0x14200 bored smr
5149 102832 0 0 2 0x14200 zerothread
8609 349757 0 0 3 0x14200 aiodoned aiodoned
68830 44489 0 0 3 0x14200 syncer update
19004 245845 0 0 3 0x14200 cleaner cleaner
*53247 253937 0 0 7 0x14200 reaper
34739 161425 0 0 3 0x14200 pgdaemon pagedaemon
37735 471599 0 0 3 0x14200 bored viomb
3256 181110 0 0 3 0x40014200 acpi0 acpi0
10438 142983 0 0 3 0x14200 bored softnet0
39862 195312 0 0 3 0x14200 bored systqmp
57847 223310 0 0 3 0x14200 bored systq
70478 358692 0 0 3 0x40014200 tmoslp softclock
46108 101435 0 0 3 0x40014200 idle0
1 82182 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 11035 12103K 12388K 166960K 12669 0
pcb 18 12K 12K 166960K 73 0
rtable 213 6K 9K 166960K 414 0
pf 30 13K 94K 166960K 461 0
ifaddr 38 6K 7K 166960K 65 0
ifgroup 46 2K 2K 166960K 92 0
sysctl 4 1K 9K 166960K 9 0
counters 32 17K 18K 166960K 50 0
ioctlops 0 0K 4K 166960K 104 0
iov 0 0K 12K 166960K 5 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1329 84K 84K 166960K 1666 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 20K 24K 166960K 8 0
VM map 2 1K 1K 166960K 2 0
sem 10 1K 1K 166960K 10 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 93K 166960K 464 0
sigio 0 0K 0K 166960K 1 0
proc 60 59K 108K 166960K 557 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 28 0
in_multi 84 6K 7K 166960K 123 0
ether_multi 1 0K 0K 166960K 4 0
mrt 0 0K 0K 166960K 17 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 73 334K 334K 166960K 73 0
exec 0 0K 1K 166960K 430 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 206 150K 167K 166960K 5717 0
UVM aobj 12 2K 2K 166960K 14 0
pinsyscall 38 76K 96K 166960K 1581 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 17 0
NDP 10 0K 2K 166960K 44 0
temp 39 9063K 9127K 166960K 18814 0
kqueue 16 24K 26K 166960K 91 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 53 0 50 1 0 1 1 0 8 0
rtentry 136 125 0 28 4 0 4 4 0 8 0
unpcb 144 149 0 134 1 0 1 1 0 8 0
syncache 336 6 0 6 2 1 1 1 0 8 1
tcpcb 736 93 0 88 1 0 1 1 0 8 0
arp 96 21 0 4 1 0 1 1 0 8 0
inpcb 328 326 0 315 5 1 4 4 0 8 2
nd6 112 27 0 8 1 0 1 1 0 8 0
kcovpl 48 9 0 1 1 0 1 1 0 8 0
ppxss 1072 12 0 12 1 1 0 1 0 8 0
pfstscr 40 4 0 4 1 1 0 1 0 8 0
pffrag 232 3 0 0 1 0 1 1 0 482 0
pffrnode 88 3 0 0 1 0 1 1 0 8 0
pffrent 40 7 0 3 1 0 1 1 0 8 0
pfrktable 1344 6 0 6 1 1 0 1 0 8 0
pfsrclim 320 1 0 1 1 1 0 1 0 8 0
pfanchor 1288 74 0 11 6 0 6 6 0 8 0
pftag 88 11 0 9 1 0 1 1 0 8 0
pfqueue 320 2 0 1 1 0 1 1 0 8 0
pfstkey 128 2 0 2 1 1 0 1 0 8 0
pfstate 384 2 0 2 1 1 0 1 0 8 0
pfrule 1360 18 0 18 2 1 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 502 0 104 29 1 28 29 0 8 2
art_table 40 503 0 104 5 0 5 5 0 8 0
art_node 32 125 0 37 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 1 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 8 0 0 1 0 1 1 0 8 0
shmpl 112 11 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 2110 0 652 92 0 92 92 0 8 0
ffsino 256 2110 0 652 92 0 92 92 0 8 0
nchpl 144 2768 0 1072 64 0 64 64 0 8 0
vnodes 216 2396 0 0 134 0 134 134 0 8 0
namei 1024 8517 0 8517 2 1 1 2 0 8 1
pfiaddrpl 120 2 0 2 1 1 0 1 0 8 0
kstatmem 264 53 0 32 2 0 2 2 0 8 0
scsiplug 72 1 0 1 1 1 0 1 0 8 0
scxspl 216 8636 0 8636 3 2 1 3 1 8 1
plimitpl 152 71 0 55 1 0 1 1 0 8 0
sigapl 424 775 0 713 8 1 7 7 0 8 0
knotepl 120 16183 0 16112 15 7 8 10 0 8 5
kqueuepl 184 212 0 201 4 3 1 4 0 8 0
pipepl 304 147 0 119 3 0 3 3 0 8 0
fdescpl 448 742 0 713 5 1 4 5 0 8 0
filepl 120 3300 0 3083 10 2 8 9 0 8 0
lockfpl 104 137 0 135 1 0 1 1 0 8 0
lockfspl 48 62 0 60 1 0 1 1 0 8 0
sessionpl 144 97 0 89 1 0 1 1 0 8 0
pgrppl 48 111 0 95 1 0 1 1 0 8 0
ucredpl 104 454 0 440 1 0 1 1 0 8 0
zombiepl 144 766 0 766 1 0 1 1 0 8 1
processpl 1152 775 0 713 5 0 5 5 0 8 0
procpl 664 1258 0 1185 9 0 9 9 0 8 2
sosppl 176 3 0 3 1 1 0 1 0 8 0
sockpl 552 540 0 511 5 0 5 5 0 8 2
mcl64k 65536 52 0 52 2 1 1 1 0 8 1
mcl16k 16384 5 0 5 2 1 1 1 0 8 1
mcl9k128 9344 1 0 1 1 1 0 1 0 8 0
mcl8k 8192 11 0 11 2 1 1 1 0 8 1
mcl4k 4096 2967 0 2912 15 7 8 15 0 8 0
mcl2k 2048 443 0 441 2 1 1 1 0 8 0
mtagpl 96 7 0 4 1 0 1 1 0 8 0
mbufpl 256 7227 0 7071 12 1 11 12 0 8 0
bufpl 280 2947 0 103 204 0 204 204 0 8 0
anonpl 24 121428 0 118302 32 0 32 32 0 187 8
amapchunkpl 152 17988 0 17577 38 14 24 34 0 158 3
amappl16 200 2034 0 2006 5 2 3 5 0 8 0
amappl15 192 69 0 69 1 1 0 1 0 8 0
amappl14 184 439 0 438 1 0 1 1 0 8 0
amappl13 176 113 0 103 1 0 1 1 0 8 0
amappl12 168 1006 0 979 2 0 2 2 0 8 0
amappl11 160 6 0 6 1 1 0 1 0 8 0
amappl10 152 88 0 78 1 0 1 1 0 8 0
amappl9 144 273 0 273 1 1 0 1 0 8 0
amappl8 136 101 0 100 1 0 1 1 0 8 0
amappl7 128 147 0 136 1 0 1 1 0 8 0
amappl6 120 162 0 160 1 0 1 1 0 8 0
amappl5 112 89 0 81 1 0 1 1 0 8 0
amappl4 104 257 0 240 1 0 1 1 0 8 0
amappl3 96 3534 0 3434 4 0 4 4 0 8 0
amappl2 88 518 0 461 2 0 2 2 0 8 0
amappl1 80 10416 0 9862 14 2 12 14 0 8 0
amappl 88 4957 0 4815 6 1 5 5 0 92 0
uvmvnodes 80 104 0 0 3 0 3 3 0 8 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma2048 2048 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 72 13 0 2 1 0 1 1 0 8 0
uaddrrnd 24 741 0 713 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 741 0 713 1 0 1 1 0 8 0
vmmpekpl 168 7285 0 7242 3 0 3 3 0 8 0
vmmpepl 168 53486 0 51745 84 1 83 83 0 357 2
vmsppl 368 741 0 713 4 1 3 4 0 8 0
rwobjpl 40 16878 0 15930 11 0 11 11 0 8 0
pdppl 4096 1488 0 1426 102 36 66 80 0 8 4
pvpl 32 319093 0 310525 100 3 97 97 0 265 16
pmappl 216 740 0 713 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 374 0 57 10 0 10 10 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
mtx_enter(deadbeefdeadbfcf) at mtx_enter+0x6e sys/kern/kern_lock.c:549
prsignal(deadbeefdeadbeef,14) at prsignal+0x36 sys/kern/kern_sig.c:904
reaper(ffff80002a6fd228) at reaper+0x2bc sys/kern/kern_exit.c:516
end trace frame: 0x0, count: -3
ddb> machine ddbcpu 1
No such command
ddb> trace
mtx_enter(deadbeefdeadbfcf) at mtx_enter+0x6e sys/kern/kern_lock.c:549
prsignal(deadbeefdeadbeef,14) at prsignal+0x36 sys/kern/kern_sig.c:904
reaper(ffff80002a6fd228) at reaper+0x2bc sys/kern/kern_exit.c:516
end trace frame: 0x0, count: -3


---
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