protection_fault: in_pcbhash_lookup

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syzbot

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Jun 12, 2025, 5:19:46 PMJun 12
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Hello,

syzbot found the following issue on:

HEAD commit: 97ee8abe534f Unbreak previous.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=14cfb682580000
kernel config: https://syzkaller.appspot.com/x/.config?x=1bc15e68cd2a49e5
dashboard link: https://syzkaller.appspot.com/bug?extid=7459bc68bb82aef152b6

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/8299542ddda4/disk-97ee8abe.raw.xz
bsd.gdb: https://storage.googleapis.com/syzbot-assets/6e71d76af37b/bsd-97ee8abe.gdb.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d1f72584b382/kernel-97ee8abe.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7459bc...@syzkaller.appspotmail.com

kernel: protection fault trap, code=0
Stopped at in_pcbhash_lookup+0xc0: movl 0xc0(%r14),%r12d
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
the kernel did not panic
ddb> trace
in_pcbhash_lookup(ffffffff839cdd98,d7f7b054d94ea848,0,ffffffff83701c78,0,ffffffff83701c78,5b72e165975dc8b1) at in_pcbhash_lookup+0xc0 sys/netinet/in_pcb.c:1115
in_pcblookup_listen(ffffffff839cdd98,100007f,1600,fffffd8069081b00,0) at in_pcblookup_listen+0x294 sys/netinet/in_pcb.c:-1
tcp_input_solocked(ffff80002a74aed0,ffff80002a74aedc,0,2,ffff80002a74aec8) at tcp_input_solocked+0xa97 sys/netinet/tcp_input.c:-1
tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff800000b11800,ffff80002a74afa8,0) at if_input_process+0x229 sys/net/if.c:1015
ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874
taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -7
ddb> show registers
rdi 0xdead4110
rsi 0
rbp 0xffff80002a74ac10
rbx 0
rdx 0
rcx 0x1600 __ALIGN_SIZE+0x600
rax 0xffff80002a72c290
r8 0
r9 0xffffffff83701c78 zeroin_addr
r10 0xe1866b8a45a954d2
r11 0x39c9f57789999bf0
r12 0
r13 0xdead4110
r14 0xdead4110dead4110
r15 0x1600 __ALIGN_SIZE+0x600
rip 0xffffffff82c47ee0 in_pcbhash_lookup+0xc0
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80002a74ab90
ss 0x10
in_pcbhash_lookup+0xc0: movl 0xc0(%r14),%r12d
ddb> show proc
PROC (softnet0) tid=351350 pid=27268 tcnt=1 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a72c7b0,0xffff80002a72c010
process=0xffff8000ffffc000 user=0xffff80002a746000, vmspace=0xffffffff838e16a0
estcpu=0, cpticks=2, pctcpu=0.1, user=0, sys=0, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
97007 432569 52915 0 2 0 syz-executor
97007 455428 52915 0 3 0x4000080 netcon syz-executor
49674 460683 20971 0 2 0 syz-executor
36259 364224 58138 0 2 0 syz-executor
36259 35667 58138 0 3 0x4000080 fsleep syz-executor
57924 88540 67408 0 3 0x80 nanoslp syz-executor
57924 96607 67408 0 3 0x4000080 kqpoll syz-executor
57924 27928 67408 0 3 0x4000080 fsleep syz-executor
55604 317281 5831 0 3 0x80 nanoslp syz-executor
55604 99474 5831 0 3 0x4000080 kqsel syz-executor
55604 92171 5831 0 3 0x4000080 fsleep syz-executor
73506 253429 1 0 3 0x100083 ttyin getty
67408 78588 49222 0 3 0x82 nanoslp syz-executor
20971 236338 49222 0 3 0x82 nanoslp syz-executor
19501 20926 0 0 3 0x14200 bored sosplice
52915 13343 49222 0 3 0x82 nanoslp syz-executor
7308 208859 49222 0 2 0x2 syz-executor
5831 351928 49222 0 3 0x82 nanoslp syz-executor
69289 397869 49222 0 3 0x82 piperd syz-executor
58138 335745 49222 0 3 0x82 nanoslp syz-executor
25739 426837 49222 0 2 0x2 syz-executor
49222 387994 706 0 2 0x2 syz-executor
706 445539 4920 0 3 0x10008a sigsusp ksh
4920 190243 47800 0 3 0x98 kqread sshd-session
47800 157022 39041 0 3 0x92 kqread sshd-session
39041 5864 1 0 3 0x88 kqread sshd
42757 283915 44843 73 3 0x1100090 kqread syslogd
44843 416894 1 0 3 0x100082 sbwait syslogd
29553 168042 1 0 3 0x100080 kqread resolvd
61338 341142 69973 77 3 0x100092 kqread dhcpleased
91507 1935 69973 77 3 0x100092 kqread dhcpleased
69973 124044 1 0 3 0x80 kqread dhcpleased
84656 85951 0 0 3 0x14200 bored smr
71572 16910 0 0 2 0x14200 zerothread
19599 309695 0 0 3 0x14200 aiodoned aiodoned
48578 45174 0 0 3 0x14200 syncer update
23895 452954 0 0 3 0x14200 cleaner cleaner
76595 117898 0 0 3 0x14200 reaper reaper
3431 228654 0 0 3 0x14200 pgdaemon pagedaemon
83067 172190 0 0 3 0x14200 bored viomb
85997 478055 0 0 3 0x40014200 acpi0 acpi0
27531 21151 0 0 3 0x14200 bored softnet3
10010 103884 0 0 3 0x14200 bored softnet2
88646 419273 0 0 3 0x14200 bored softnet1
*27268 351350 0 0 7 0x14200 softnet0
43455 356957 0 0 3 0x14200 bored systqmp
61962 60208 0 0 3 0x14200 bored systq
11706 511996 0 0 3 0x40014200 tmoslp softclock
39442 110155 0 0 3 0x40014200 idle0
1 49983 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 10201 11368K 11658K 166960K 12116 0
pcb 18 12K 12K 166960K 83 0
rtable 223 7K 7K 166960K 460 0
pf 30 12K 14K 166960K 75 0
ifaddr 42 7K 8K 166960K 77 0
ifgroup 50 2K 2K 166960K 115 0
sysctl 1 1K 9K 166960K 5 0
counters 32 17K 18K 166960K 59 0
ioctlops 0 0K 4K 166960K 111 0
iov 0 0K 17K 166960K 52 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1341 84K 85K 166960K 1907 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 8 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 17 0
dirhash 12 2K 2K 166960K 33 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 15 53K 97K 166960K 604 0
sigio 0 0K 0K 166960K 10 0
proc 60 59K 124K 166960K 577 0
subproc 72 4K 4K 166960K 90 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 52 0
in_multi 96 7K 7K 166960K 134 0
ether_multi 1 0K 0K 166960K 2 0
mrt 0 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 67 307K 307K 166960K 67 0
exec 0 0K 1K 166960K 398 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 201 158K 177K 166960K 6923 0
UVM aobj 14 2K 2K 166960K 16 0
pinsyscall 36 72K 96K 166960K 1707 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 2 0K 0K 166960K 28 0
NDP 11 0K 2K 166960K 48 0
temp 42 8679K 8743K 166960K 17136 0
kqueue 13 20K 32K 166960K 93 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 120 122 0 119 3 0 3 3 0 8 2
rtentry 136 149 0 47 4 0 4 4 0 8 0
unpcb 144 232 0 217 2 0 2 2 0 8 1
syncache 336 9 0 9 1 0 1 1 0 8 1
tcpqe 32 4 0 4 1 0 1 1 0 8 1
tcpcb 736 109 0 101 2 0 2 2 0 8 1
arp 88 23 0 4 1 0 1 1 0 8 0
ipq 40 2 0 0 1 0 1 1 0 8 0
ipqe 40 2 0 0 1 0 1 1 0 8 0
inpcb 328 449 0 437 7 0 7 7 0 8 5
ip6q 72 2 0 1 1 0 1 1 0 8 0
ip6af 40 3 0 2 1 0 1 1 0 8 0
nd6 104 35 0 9 1 0 1 1 0 8 0
pkpcb 40 1 0 1 1 0 1 1 0 8 1
kcovpl 48 10 0 2 1 0 1 1 0 8 0
ppxss 1072 15 0 15 1 0 1 1 0 8 1
pppxif 1384 7 0 7 1 0 1 1 0 8 1
pfrktable 1344 1 0 1 1 0 1 1 0 8 1
pfrule 1344 1 0 1 1 0 1 1 0 8 1
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 638 0 199 29 0 29 29 0 8 0
art_table 32 639 0 199 4 0 4 4 0 8 0
art_node 16 144 0 53 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 3 1 0 1 1 0 8 1
semupl 112 2 0 2 1 0 1 1 0 8 1
semapl 112 14 0 4 1 0 1 1 0 8 0
shmpl 112 13 0 2 1 0 1 1 0 8 0
dirhash 1024 31 0 14 3 0 3 3 0 8 0
dino2pl 256 2475 0 974 95 0 95 95 0 8 0
ffsino 248 2475 0 974 95 0 95 95 0 8 0
nchpl 144 3221 0 1544 63 0 63 63 0 8 0
uvmvnodes 80 2843 0 0 59 0 59 59 0 8 0
vnodes 216 2843 0 0 158 0 158 158 0 8 0
namei 1024 10261 0 10259 2 0 2 2 0 8 1
kstatmem 264 56 0 34 2 0 2 2 0 8 0
scxspl 216 10056 0 10056 8 0 8 8 1 8 8
plimitpl 152 115 0 97 1 0 1 1 0 8 0
sigapl 424 884 0 840 7 0 7 7 0 8 1
knotepl 120 17737 0 17690 17 6 11 17 0 8 8
kqueuepl 184 128 0 117 1 0 1 1 0 8 0
pipepl 296 212 0 185 8 0 8 8 0 8 5
fdescpl 440 867 0 840 5 0 5 5 0 8 1
filepl 120 4529 0 4320 13 0 13 13 0 8 5
lockfpl 104 349 0 346 2 0 2 2 0 8 1
lockfspl 48 101 0 98 1 0 1 1 0 8 0
sessionpl 144 29 0 21 1 0 1 1 0 8 0
pgrppl 48 48 0 32 1 0 1 1 0 8 0
ucredpl 104 771 0 759 1 0 1 1 0 8 0
zombiepl 144 840 0 840 1 0 1 1 0 8 1
processpl 1160 884 0 840 4 0 4 4 0 8 0
procpl 656 1481 0 1431 6 0 6 6 0 8 0
sosppl 168 1 0 1 1 0 1 1 0 8 1
sockpl 528 813 0 782 8 0 8 8 0 8 5
mcl64k 65536 19 0 19 1 0 1 1 0 8 1
mcl16k 16384 5 0 5 1 0 1 1 0 8 1
mcl12k 12288 2 0 2 1 0 1 1 0 8 1
mcl9k 9216 5 0 5 1 0 1 1 0 8 1
mcl8k 8192 20 0 20 1 0 1 1 0 8 1
mcl4k 4096 3067 0 3014 13 0 13 13 0 8 6
mcl2k2 2112 1 0 1 1 0 1 1 0 8 1
mcl2k 2048 553 0 546 2 0 2 2 0 8 1
mtagpl 96 31 0 6 1 0 1 1 0 8 0
mbufpl 256 8825 0 8623 16 0 16 16 0 8 3
bufpl 280 3096 0 119 213 0 213 213 0 8 0
anonpl 24 143941 0 141015 57 0 57 57 0 187 29
amapchunkpl 152 22352 0 21965 41 0 41 41 0 158 23
amappl16 200 2742 0 2710 22 8 14 15 0 8 11
amappl15 192 3 0 3 1 0 1 1 0 8 1
amappl14 184 127 0 117 1 0 1 1 0 8 0
amappl13 176 4 0 4 1 0 1 1 0 8 1
amappl12 168 1509 0 1483 3 0 3 3 0 8 1
amappl11 160 44 0 34 1 0 1 1 0 8 0
amappl10 152 5 0 5 1 0 1 1 0 8 1
amappl9 144 263 0 263 1 0 1 1 0 8 1
amappl8 136 23 0 21 1 0 1 1 0 8 0
amappl7 128 164 0 154 1 0 1 1 0 8 0
amappl6 120 191 0 187 1 0 1 1 0 8 0
amappl5 112 128 0 121 1 0 1 1 0 8 0
amappl4 104 307 0 291 1 0 1 1 0 8 0
amappl3 96 4103 0 4016 4 0 4 4 0 8 0
amappl2 88 671 0 616 2 0 2 2 0 8 0
amappl1 80 11042 0 10510 15 0 15 15 0 8 0
amappl 88 6123 0 5986 5 0 5 5 0 92 0
dma16384 16384 1 0 1 1 0 1 1 0 8 1
dma4096 4096 1 0 1 1 0 1 1 0 8 1
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 0 1 1 0 8 1
dma128 128 253 0 253 1 0 1 1 0 8 1
dma64 64 6 0 6 1 0 1 1 0 8 1
dma32 32 7 0 7 1 0 1 1 0 8 1
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 15 0 2 1 0 1 1 0 8 0
uaddrrnd 24 867 0 840 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 867 0 840 1 0 1 1 0 8 0
vmmpekpl 168 8554 0 8517 3 0 3 3 0 8 0
vmmpepl 168 61004 0 59296 94 0 94 94 0 357 7
vmsppl 360 866 0 840 4 0 4 4 0 8 1
rwobjpl 32 21131 0 17463 31 0 31 31 0 8 0
pdppl 4096 1740 0 1680 104 38 66 82 0 8 6
pvpl 32 400376 0 392577 130 0 130 130 0 265 44
pmappl 216 866 0 840 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 275 0 38 7 0 7 7 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
in_pcbhash_lookup(ffffffff839cdd98,d7f7b054d94ea848,0,ffffffff83701c78,0,ffffffff83701c78,5b72e165975dc8b1) at in_pcbhash_lookup+0xc0 sys/netinet/in_pcb.c:1115
in_pcblookup_listen(ffffffff839cdd98,100007f,1600,fffffd8069081b00,0) at in_pcblookup_listen+0x294 sys/netinet/in_pcb.c:-1
tcp_input_solocked(ffff80002a74aed0,ffff80002a74aedc,0,2,ffff80002a74aec8) at tcp_input_solocked+0xa97 sys/netinet/tcp_input.c:-1
tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff800000b11800,ffff80002a74afa8,0) at if_input_process+0x229 sys/net/if.c:1015
ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874
taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -7
ddb> machine ddbcpu 1
No such command
ddb> trace
in_pcbhash_lookup(ffffffff839cdd98,d7f7b054d94ea848,0,ffffffff83701c78,0,ffffffff83701c78,5b72e165975dc8b1) at in_pcbhash_lookup+0xc0 sys/netinet/in_pcb.c:1115
in_pcblookup_listen(ffffffff839cdd98,100007f,1600,fffffd8069081b00,0) at in_pcblookup_listen+0x294 sys/netinet/in_pcb.c:-1
tcp_input_solocked(ffff80002a74aed0,ffff80002a74aedc,0,2,ffff80002a74aec8) at tcp_input_solocked+0xa97 sys/netinet/tcp_input.c:-1
tcp_input_mlist(ffffffff839cae60,2) at tcp_input_mlist+0x93 sys/netinet/tcp_input.c:-1
if_input_process(ffff800000b11800,ffff80002a74afa8,0) at if_input_process+0x229 sys/net/if.c:1015
ifiq_process(ffff800000b11c18) at ifiq_process+0xcd sys/net/ifq.c:874
taskq_thread(ffff80000002c000) at taskq_thread+0xd4 sys/kern/kern_task.c:446
end trace frame: 0x0, count: -7


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syzbot

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Sep 10, 2025, 6:59:19 PM (14 days ago) Sep 10
to syzkaller-o...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
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