panic: unhandled af (4)

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syzbot

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Dec 24, 2021, 3:17:24 AM12/24/21

to syzkaller-o...@googlegroups.com

Hello,

syzbot found the following issue on:

HEAD commit: 9d2191b71eea regen
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=179826edb00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=0ef9190e7d0195496d0d

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+0ef919...@syzkaller.appspotmail.com

panic: unhandled af 0
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
291875 60638 0 0 0 0 syz-executor.1
*145281 60638 0 0 0x4000000 1K syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16
pf_addrcpy(ffff800021271270,ffff800000c93790,0) at pf_addrcpy+0x9e sys/net/pf.c:413
pf_map_addr(0,ffff800000c93548,ffff8000212714a8,ffff800021271270,ffff800021271188,ffff800021271350,ab3d2075ae4954a0,ffff800021271490) at pf_map_addr+0x3c3
pf_get_sport(ffff800021271490,ffff800000c93548,ffff800021271270,ffff80002127129e,0,0,b33db9c42f435c43) at pf_get_sport+0xc5 sys/net/pf_lb.c:161
pf_get_transaddr_af(ffff800000c93548,ffff800021271490,ffff800021271350) at pf_get_transaddr_af+0x153 sys/net/pf_lb.c:756
pf_test_rule(ffff800021271490,ffff800021271588,ffff800021271590,ffff800021271580,ffff800021271560,ffff80002127159e,7abcfdf0c6e3edfd) at pf_test_rule+0x480 sys/net/pf.c:3891
pf_test(18,1,ffff800000b36000,ffff800021271768) at pf_test+0x1b38 sys/net/pf.c:7140
ip6_input_if(ffff800021271768,ffff800021271774,29,0,ffff800000b36000) at ip6_input_if+0x2da sys/netinet6/ip6_input.c:318
ipv6_input(ffff800000b36000,fffffd8066b66000) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171
ether_input(ffff800000b36000,fffffd8066b66000) at ether_input+0x573
tun_dev_write(5d01,ffff800021271ad8,0,2) at tun_dev_write+0x203 sys/net/if_tun.c:874
spec_write(ffff800021271930) at spec_write+0xd4 sys/kern/spec_vnops.c:309
end trace frame: 0xffff8000212719a0, count: 0
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{1}>
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: unhandled af 0
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16
pf_addrcpy(ffff800021271270,ffff800000c93790,0) at pf_addrcpy+0x9e sys/net/pf.c:413
pf_map_addr(0,ffff800000c93548,ffff8000212714a8,ffff800021271270,ffff800021271188,ffff800021271350,ab3d2075ae4954a0,ffff800021271490) at pf_map_addr+0x3c3
pf_get_sport(ffff800021271490,ffff800000c93548,ffff800021271270,ffff80002127129e,0,0,b33db9c42f435c43) at pf_get_sport+0xc5 sys/net/pf_lb.c:161
pf_get_transaddr_af(ffff800000c93548,ffff800021271490,ffff800021271350) at pf_get_transaddr_af+0x153 sys/net/pf_lb.c:756
pf_test_rule(ffff800021271490,ffff800021271588,ffff800021271590,ffff800021271580,ffff800021271560,ffff80002127159e,7abcfdf0c6e3edfd) at pf_test_rule+0x480 sys/net/pf.c:3891
pf_test(18,1,ffff800000b36000,ffff800021271768) at pf_test+0x1b38 sys/net/pf.c:7140
ip6_input_if(ffff800021271768,ffff800021271774,29,0,ffff800000b36000) at ip6_input_if+0x2da sys/netinet6/ip6_input.c:318
ipv6_input(ffff800000b36000,fffffd8066b66000) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171
ether_input(ffff800000b36000,fffffd8066b66000) at ether_input+0x573
tun_dev_write(5d01,ffff800021271ad8,0,2) at tun_dev_write+0x203 sys/net/if_tun.c:874
spec_write(ffff800021271930) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd8079db34e8,ffff800021271ad8,11,fffffd807f7d8780) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd8069c6ddc8,ffff800021271ad8,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000226a1ce8,c8,ffff800021271ad8,0,ffff800021271bd0) at dofilewritev+0x19c sys/kern/sys_generic.c:380
sys_write(ffff8000226a1ce8,ffff800021271b70,ffff800021271bd0) at sys_write+0x83 sys/kern/sys_generic.c:300
syscall(ffff800021271c40) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021271c40) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x86dfdf5add0, count: -20
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800021270f10
rbx 0xffff800020d39bff
rdx 0
rcx 0
rax 0xffff8000226a1ce8
r8 0x101010101010101
r9 0x8080808080808080
r10 0xdeda7b431ce44b30
r11 0x4dad9354286974d1
r12 0xffff800020d39a00
r13 0
r14 0
r15 0x1
rip 0xffffffff817f3738 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800021270f00
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=145281 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=83, nice=20
forw=0xffffffffffffffff, list=0xffff8000226a0008,0xffffffff82981830
process=0xffff8000211f31f0 user=0xffff80002126c000, vmspace=0xfffffd806ee2a178
estcpu=36, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
60638 291875 31904 0 7 0 syz-executor.1
*60638 145281 31904 0 7 0x4000000 syz-executor.1
73513 217462 1 0 3 0x100083 ttyin getty
91558 261193 91754 0 3 0x82 nanoslp syz-executor.3
94458 494573 91754 0 3 0x82 nanoslp syz-executor.0
43917 392669 0 0 3 0x14200 bored sosplice
20358 104101 91754 0 3 0x82 nanoslp syz-executor.2
31904 132146 91754 0 3 0x82 nanoslp syz-executor.1
91754 326231 20070 0 3 0x82 thrsleep syz-fuzzer
91754 311680 20070 0 3 0x4000082 thrsleep syz-fuzzer
91754 523383 20070 0 3 0x4000082 thrsleep syz-fuzzer
91754 342592 20070 0 3 0x4000082 thrsleep syz-fuzzer
91754 167354 20070 0 3 0x4000082 thrsleep syz-fuzzer
91754 156189 20070 0 3 0x4000082 thrsleep syz-fuzzer
91754 1322 20070 0 3 0x4000082 thrsleep syz-fuzzer
91754 291954 20070 0 3 0x4000082 kqread syz-fuzzer
20070 476614 85275 0 3 0x10008a sigsusp ksh
85275 287088 77008 0 3 0x9a poll sshd
77008 491435 1 0 3 0x88 poll sshd
34178 245687 85415 74 3 0x100092 bpf pflogd
85415 327440 1 0 3 0x80 netio pflogd
21684 314483 59241 73 3 0x100090 kqread syslogd
59241 419292 1 0 3 0x100082 netio syslogd
2292 384029 1 0 3 0x100080 kqread resolvd
57938 248905 67075 77 3 0x100092 kqread dhcpleased
4462 184718 67075 77 3 0x100092 kqread dhcpleased
67075 302376 1 0 3 0x80 kqread dhcpleased
9734 319706 0 0 3 0x14200 bored smr
19771 465290 0 0 3 0x14200 pgzero zerothread
75122 347808 0 0 3 0x14200 aiodoned aiodoned
77580 98243 0 0 3 0x14200 syncer update
77654 486613 0 0 3 0x14200 cleaner cleaner
94511 443313 0 0 3 0x14200 reaper reaper
91018 41706 0 0 3 0x14200 pgdaemon pagedaemon
71316 449487 0 0 3 0x14200 bored viomb
22817 82389 0 0 3 0x40014200 acpi0 acpi0
27067 14303 0 0 3 0x40014200 idle1
10197 159604 0 0 3 0x14200 bored softnet
79079 489132 0 0 3 0x14200 bored systqmp
80888 472968 0 0 3 0x14200 bored systq
23560 229432 0 0 3 0x40014200 bored softclock
20811 9806 0 0 3 0x40014200 idle0
1 282858 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 60638 (syz-executor.1) thread 0xffff8000226a1ce8 (145281)
exclusive rwlock pf_lock r = 0 (0xffffffff8277cf50)
#0 witness_lock+0x44d
#1 pf_test+0x1b0e
#2 ip6_input_if+0x2da sys/netinet6/ip6_input.c:318
#3 ipv6_input+0x48 sys/netinet6/ip6_input.c:171
#4 ether_input+0x573
#5 tun_dev_write+0x203 sys/net/if_tun.c:874
#6 spec_write+0xd4 sys/kern/spec_vnops.c:309
#7 VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
#8 vn_write+0x157 sys/kern/vfs_vnops.c:414
#9 dofilewritev+0x19c sys/kern/sys_generic.c:380
#10 sys_write+0x83 sys/kern/sys_generic.c:300
#11 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#11 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#12 Xsyscall+0x128
exclusive rwlock netlock r = 0 (0xffffffff8277f740)
#0 witness_lock+0x44d
#1 tun_dev_write+0x1f8 sys/net/if_tun.c:873
#2 spec_write+0xd4 sys/kern/spec_vnops.c:309
#3 VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
#4 vn_write+0x157 sys/kern/vfs_vnops.c:414
#5 dofilewritev+0x19c sys/kern/sys_generic.c:380
#6 sys_write+0x83 sys/kern/sys_generic.c:300
#7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829cd5e8)
#0 witness_lock+0x44d
#1 vn_write+0x42 sys/kern/vfs_vnops.c:399
#2 dofilewritev+0x19c sys/kern/sys_generic.c:380
#3 sys_write+0x83 sys/kern/sys_generic.c:300
#4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#5 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10185 6487K 7239K 78643K 17537 0
pcb 13 11K 12K 78643K 326 0
rtable 142 11K 12K 78643K 4685 0
ifaddr 63 15K 17K 78643K 1203 0
sysctl 1 1K 1K 78643K 2 0
counters 46 34K 35K 78643K 150 0
ioctlops 0 0K 8K 78643K 6021 0
iov 0 0K 28K 78643K 148 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1294 81K 81K 78643K 3465 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 42 0
VM map 2 1K 1K 78643K 2 0
sem 11 1K 1K 78643K 19 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 7 21K 49K 78643K 9320 0
sigio 0 0K 0K 78643K 38 0
proc 71 87K 124K 78643K 931 0
subproc 52 3K 3K 78643K 199 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 321 0
in_multi 33 2K 4K 78643K 402 0
ether_multi 1 0K 0K 78643K 75 0
mrt 1 0K 0K 78643K 51 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 169 758K 758K 78643K 169 0
exec 0 0K 2K 78643K 1098 0
tdb 3 0K 0K 78643K 3 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 303 215K 228K 78643K 112306 0
UVM aobj 48 2K 2K 78643K 56 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 420 0
NDP 8 0K 1K 78643K 108 0
temp 105 4215K 8301K 78643K 72146 0
kqueue 10 14K 22K 78643K 233 0
SYN cache 2 0K 16K 78643K 4 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 167 0 164 1 0 1 1 0 8 0
rtentry 112 246 0 202 3 0 3 3 0 8 0
unpcb 128 10083 0 10065 31 26 5 9 0 8 4
syncache 296 43 0 43 8 8 0 1 0 8 0
tcpqe 32 7 64 7 1 1 0 1 0 8 0
tcpcb 736 886 0 873 14 11 3 6 0 8 1
arp 120 35 0 29 1 0 1 1 0 8 0
inpcb 304 3377 0 3364 20 16 4 7 0 8 2
rttmr 72 18 0 18 6 6 0 1 0 8 0
nd6 48 74 0 66 1 0 1 1 0 8 0
pkpcb 40 15 0 15 5 5 0 1 0 8 0
kcovpl 48 15 0 11 1 0 1 1 0 8 0
ppxss 1248 12 0 12 3 3 0 1 0 8 0
pfstscr 40 19 0 19 5 5 0 1 0 8 0
pffrag 232 24 0 24 2 2 0 1 0 482 0
pffrnode 88 24 0 24 2 2 0 1 0 8 0
pffrent 40 433 0 433 2 2 0 1 0 8 0
pfosfp 40 1436 0 1011 5 0 5 5 0 8 0
pfosfpen 112 1436 0 714 21 0 21 21 0 8 0
pfrktable 1344 1936 0 1922 5 3 2 2 0 8 0
pftag 88 11 0 10 2 1 1 1 0 8 0
pfstitem 24 42 0 40 1 0 1 1 0 8 0
pfstkey 112 74 0 72 1 0 1 1 0 8 0
pfstate 320 56 0 54 3 2 1 3 0 8 0
pfsrctr 152 49 0 49 1 1 0 1 0 8 0
pfrule 1360 2225 0 2056 15 0 15 15 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 827 0 634 21 6 15 19 0 8 0
art_table 32 828 0 634 3 0 3 3 0 8 0
art_node 16 244 0 205 1 0 1 1 0 8 0
semupl 112 8 0 8 1 1 0 1 0 8 0
semapl 112 9 0 0 1 0 1 1 0 8 0
shmpl 112 53 0 8 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 12357 0 10926 90 0 90 90 0 8 0
ffsino 272 12357 0 10926 96 0 96 96 0 8 0
nchpl 144 23310 0 21709 61 0 61 61 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 65488 0 65488 6 5 1 1 0 8 1
percpumem 16 87 0 52 1 0 1 1 0 8 0
vcpupl 2048 10 0 0 2 0 2 2 0 8 0
vmpool 560 21 0 11 1 0 1 1 0 8 0
pfiaddrpl 120 988 0 869 4 0 4 4 0 8 0
scxspl 216 76482 0 76482 16 15 1 8 0 8 1
plimitpl 152 396 0 385 1 0 1 1 0 8 0
sigapl 424 9536 0 9501 5 0 5 5 0 8 0
futexpl 64 61886 0 61886 7 6 1 1 0 8 1
knotepl 112 95 0 0 3 0 3 3 0 8 0
kqueuepl 216 561 0 555 3 2 1 3 0 8 0
pipepl 336 524 0 508 12 10 2 7 0 8 0
fdescpl 496 9515 0 9495 4 1 3 4 0 8 0
filepl 152 42192 0 42039 49 38 11 16 0 8 5
lockfpl 104 2751 0 2749 1 0 1 1 0 8 0
lockfspl 48 1200 0 1198 1 0 1 1 0 8 0
sessionpl 144 35 0 22 1 0 1 1 0 8 0
pgrppl 48 48 0 35 1 0 1 1 0 8 0
ucredpl 96 3288 0 3273 1 0 1 1 0 8 0
zombiepl 144 9501 0 9498 2 1 1 1 0 8 0
processpl 1064 9536 0 9498 3 0 3 3 0 8 0
procpl 672 21141 0 21095 7 2 5 6 0 8 0
srpgc 96 16 0 16 4 4 0 1 0 8 0
sosppl 168 47 0 46 3 2 1 1 0 8 0
sockpl 480 13660 0 13622 263 248 15 35 0 8 8
mcl64k 65536 28 0 0 3 0 3 3 0 8 0
mcl16k 16384 12 0 0 2 0 2 2 0 8 0
mcl12k 12288 30 0 0 2 0 2 2 0 8 0
mcl9k 9216 15 0 0 2 0 2 2 0 8 0
mcl8k 8192 28 0 0 4 1 3 3 0 8 0
mcl4k 4096 18 0 0 3 0 3 3 0 8 0
mcl2k2 2112 6 0 0 1 0 1 1 0 8 0
mcl2k 2048 993 0 0 98 1 97 97 0 8 0
mtagpl 96 400 0 0 9 0 9 9 0 8 0
mbufpl 256 1671 0 0 88 0 88 88 0 8 0
bufpl 288 16430 0 10086 454 0 454 454 0 8 0
anonpl 24 2487680 0 2478136 204 140 64 110 0 186 0
amapchunkpl 152 269940 0 269462 74 51 23 33 0 158 1
amappl16 200 23570 0 23315 80 66 14 41 0 8 0
amappl15 192 1013 0 1012 1 0 1 1 0 8 0
amappl14 184 5 0 3 2 1 1 1 0 8 0
amappl13 176 203 0 202 1 0 1 1 0 8 0
amappl12 168 44 0 37 1 0 1 1 0 8 0
amappl11 160 1209 0 1194 1 0 1 1 0 8 0
amappl10 152 1292 0 1283 1 0 1 1 0 8 0
amappl9 144 3780 0 3775 1 0 1 1 0 8 0
amappl8 136 3058 0 2964 4 0 4 4 0 8 0
amappl7 128 2480 0 2468 1 0 1 1 0 8 0
amappl6 120 3540 0 3519 1 0 1 1 0 8 0
amappl5 112 10464 0 10444 1 0 1 1 0 8 0
amappl4 104 2087 0 2061 1 0 1 1 0 8 0
amappl3 96 522 0 506 1 0 1 1 0 8 0
amappl2 88 700 0 658 3 2 1 2 0 8 0
amappl1 80 159918 0 159453 13 2 11 13 0 8 0
amappl 88 111573 0 111402 5 0 5 5 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 72 55 0 8 1 0 1 1 0 8 0
uaddrrnd 24 9536 0 9506 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 9536 0 9506 1 0 1 1 0 8 0
vmmpekpl 168 52129 0 52090 3 0 3 3 0 8 0
vmmpepl 168 830888 0 829226 151 66 85 104 0 357 1
vmsppl 368 9535 0 9506 5 2 3 4 0 8 0
rwobjpl 56 191289 0 184205 106 5 101 103 0 8 0
pdppl 4096 19080 0 19022 98 34 64 66 0 8 6
pvpl 32 4523234 0 4510086 407 288 119 201 0 265 1
pmappl 248 9535 0 9506 3 0 3 3 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 1018 0 72 29 1 28 28 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff82832ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
end of kernel
end trace frame: 0x7f7ffffe7c90, count: 12
ddb{0}> trace
x86_ipi_db(ffffffff82832ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
end of kernel
end trace frame: 0x7f7ffffe7c90, count: -3
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16
pf_addrcpy(ffff800021271270,ffff800000c93790,0) at pf_addrcpy+0x9e sys/net/pf.c:413
pf_map_addr(0,ffff800000c93548,ffff8000212714a8,ffff800021271270,ffff800021271188,ffff800021271350,ab3d2075ae4954a0,ffff800021271490) at pf_map_addr+0x3c3
pf_get_sport(ffff800021271490,ffff800000c93548,ffff800021271270,ffff80002127129e,0,0,b33db9c42f435c43) at pf_get_sport+0xc5 sys/net/pf_lb.c:161
pf_get_transaddr_af(ffff800000c93548,ffff800021271490,ffff800021271350) at pf_get_transaddr_af+0x153 sys/net/pf_lb.c:756
pf_test_rule(ffff800021271490,ffff800021271588,ffff800021271590,ffff800021271580,ffff800021271560,ffff80002127159e,7abcfdf0c6e3edfd) at pf_test_rule+0x480 sys/net/pf.c:3891
pf_test(18,1,ffff800000b36000,ffff800021271768) at pf_test+0x1b38 sys/net/pf.c:7140
ip6_input_if(ffff800021271768,ffff800021271774,29,0,ffff800000b36000) at ip6_input_if+0x2da sys/netinet6/ip6_input.c:318
ipv6_input(ffff800000b36000,fffffd8066b66000) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171
ether_input(ffff800000b36000,fffffd8066b66000) at ether_input+0x573
tun_dev_write(5d01,ffff800021271ad8,0,2) at tun_dev_write+0x203 sys/net/if_tun.c:874
spec_write(ffff800021271930) at spec_write+0xd4 sys/kern/spec_vnops.c:309
end trace frame: 0xffff8000212719a0, count: 0
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16
pf_addrcpy(ffff800021271270,ffff800000c93790,0) at pf_addrcpy+0x9e sys/net/pf.c:413
pf_map_addr(0,ffff800000c93548,ffff8000212714a8,ffff800021271270,ffff800021271188,ffff800021271350,ab3d2075ae4954a0,ffff800021271490) at pf_map_addr+0x3c3
pf_get_sport(ffff800021271490,ffff800000c93548,ffff800021271270,ffff80002127129e,0,0,b33db9c42f435c43) at pf_get_sport+0xc5 sys/net/pf_lb.c:161
pf_get_transaddr_af(ffff800000c93548,ffff800021271490,ffff800021271350) at pf_get_transaddr_af+0x153 sys/net/pf_lb.c:756
pf_test_rule(ffff800021271490,ffff800021271588,ffff800021271590,ffff800021271580,ffff800021271560,ffff80002127159e,7abcfdf0c6e3edfd) at pf_test_rule+0x480 sys/net/pf.c:3891
pf_test(18,1,ffff800000b36000,ffff800021271768) at pf_test+0x1b38 sys/net/pf.c:7140
ip6_input_if(ffff800021271768,ffff800021271774,29,0,ffff800000b36000) at ip6_input_if+0x2da sys/netinet6/ip6_input.c:318
ipv6_input(ffff800000b36000,fffffd8066b66000) at ipv6_input+0x48 sys/netinet6/ip6_input.c:171
ether_input(ffff800000b36000,fffffd8066b66000) at ether_input+0x573
tun_dev_write(5d01,ffff800021271ad8,0,2) at tun_dev_write+0x203 sys/net/if_tun.c:874
spec_write(ffff800021271930) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd8079db34e8,ffff800021271ad8,11,fffffd807f7d8780) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd8069c6ddc8,ffff800021271ad8,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000226a1ce8,c8,ffff800021271ad8,0,ffff800021271bd0) at dofilewritev+0x19c sys/kern/sys_generic.c:380
sys_write(ffff8000226a1ce8,ffff800021271b70,ffff800021271bd0) at sys_write+0x83 sys/kern/sys_generic.c:300
syscall(ffff800021271c40) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800021271c40) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x86dfdf5add0, count: -20

---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

syzbot

unread,

Dec 24, 2021, 3:31:22 AM12/24/21

to syzkaller-o...@googlegroups.com

syzbot has found a reproducer for the following issue on:

HEAD commit: 9d2191b71eea regen
git tree: openbsd

console output: https://syzkaller.appspot.com/x/log.txt?x=10fbc4fbb00000

kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=0ef9190e7d0195496d0d

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=139efda5b00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0ef919...@syzkaller.appspotmail.com

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

248470 64775 0 0x2 0x4000080 1 syz-execprog
*491723 16596 0 0x14000 0x40000200 0K softclock

db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16

pf_addrcpy(ffff8000211548a0,ffff800000b93ce0,0) at pf_addrcpy+0x9e sys/net/pf.c:413
pf_map_addr(0,ffff800000b93a98,ffff800021154ad8,ffff8000211548a0,ffff8000211547b8,ffff800021154980,8f04aee64e587093,ffff800021154ac0) at pf_map_addr+0x3c3
pf_get_sport(ffff800021154ac0,ffff800000b93a98,ffff8000211548a0,ffff8000211548ce,0,0,549d516957257043) at pf_get_sport+0xc5 sys/net/pf_lb.c:161
pf_get_transaddr_af(ffff800000b93a98,ffff800021154ac0,ffff800021154980) at pf_get_transaddr_af+0x153 sys/net/pf_lb.c:756
pf_test_rule(ffff800021154ac0,ffff800021154bb8,ffff800021154bc0,ffff800021154bb0,ffff800021154b90,fffffd806d469ff0,cdcfcd64c6a9380a) at pf_test_rule+0x480 sys/net/pf.c:3891
pf_test(18,2,ffff800000b36000,ffff800021154d38) at pf_test+0x1dec sys/net/pf.c:7064
ip6_output(fffffd806d469f00,ffffffff82867658,0,0,ffff800021154dc8,0) at ip6_output+0x13c9 sys/netinet6/ip6_output.c:634
mld6_sendpkt(ffff800000b47300,83,0) at mld6_sendpkt+0x2cd sys/netinet6/mld6.c:465
mld6_fasttimeo() at mld6_fasttimeo+0x152 mld6_checktimer sys/netinet6/mld6.c:363 [inline]
mld6_fasttimeo() at mld6_fasttimeo+0x152 sys/netinet6/mld6.c:341
pffasttimo(ffffffff829ed9c8) at pffasttimo+0x10b sys/kern/uipc_domain.c:288
timeout_run(ffffffff829ed9c8) at timeout_run+0xcc sys/kern/kern_timeout.c:678
end trace frame: 0xffff800021154f50, count: 0

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
*cpu0: unhandled af 0
ddb{0}> trace

db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16

r13 0
r14 0
r15 0x1
rip 0xffffffff817f3738 db_enter+0x18
cs 0x8
rflags 0x246

rsp 0xffff800021154530

ss 0x10
db_enter+0x18: addq $0x8,%rsp

ddb{0}> show proc
PROC (softclock) pid=491723 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=40000200<SYSTEM,CPUPEG>
pri=0, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff800021149a40,0xffff800021149510
process=0xffff8000ffffe568 user=0xffff800021150000, vmspace=0xffffffff82873190
estcpu=0, cpticks=0, pctcpu=0.0
user=0, sys=0, intr=0
ddb{0}> ps

PID TID PPID UID S FLAGS WAIT COMMAND

89463 131991 64775 0 2 0x482 syz-executor.0
64775 490491 38093 0 3 0x82 thrsleep syz-execprog
64775 466983 38093 0 2 0x4000482 syz-execprog
64775 426089 38093 0 2 0x4000002 syz-execprog
64775 49994 38093 0 3 0x4000082 thrsleep syz-execprog
64775 11279 38093 0 3 0x4000082 thrsleep syz-execprog
64775 248470 38093 0 7 0x4000082 syz-execprog
64775 173360 38093 0 3 0x4000082 thrsleep syz-execprog
64775 132050 38093 0 3 0x4000082 thrsleep syz-execprog
38093 348860 51518 0 3 0x10008a sigsusp ksh
51518 123024 92225 0 3 0x9a poll sshd
40944 261977 1 0 3 0x100083 ttyin getty
92225 114720 1 0 3 0x88 poll sshd
65038 361289 1853 74 3 0x100092 bpf pflogd
1853 163535 1 0 3 0x80 netio pflogd
9718 149717 25496 73 3 0x100090 kqread syslogd
25496 123632 1 0 3 0x100082 netio syslogd
34120 241536 1 0 3 0x100080 kqread resolvd
78493 448639 25330 77 3 0x100092 kqread dhcpleased
15147 405304 25330 77 3 0x100092 kqread dhcpleased
25330 227644 1 0 3 0x80 kqread dhcpleased
330 432212 0 0 3 0x14200 bored smr
38472 169273 0 0 3 0x14200 pgzero zerothread
63566 180899 0 0 3 0x14200 aiodoned aiodoned
24422 51380 0 0 3 0x14200 syncer update
8064 268749 0 0 3 0x14200 cleaner cleaner
79649 169142 0 0 3 0x14200 reaper reaper
15852 237424 0 0 3 0x14200 pgdaemon pagedaemon
29699 505805 0 0 3 0x14200 bored viomb
38403 216785 0 0 3 0x40014200 acpi0 acpi0
16347 217459 0 0 3 0x40014200 idle1
31784 424207 0 0 3 0x14200 bored softnet
81381 282816 0 0 3 0x14200 bored systqmp
53714 502725 0 0 3 0x14200 bored systq
*16596 491723 0 0 7 0x40014200 softclock
71503 385006 0 0 3 0x40014200 idle0
1 328200 0 0 3 0x82 wait init

0 0 -1 0 3 0x10200 scheduler swapper

ddb{0}> show all locks
Process 16596 (softclock) thread 0xffff8000211497a0 (491723)

exclusive rwlock pf_lock r = 0 (0xffffffff8277cf50)
#0 witness_lock+0x44d

#1 pf_test+0x1dc2
#2 ip6_output+0x13c9 sys/netinet6/ip6_output.c:634
#3 mld6_sendpkt+0x2cd sys/netinet6/mld6.c:465
#4 mld6_fasttimeo+0x152 mld6_checktimer sys/netinet6/mld6.c:363 [inline]
#4 mld6_fasttimeo+0x152 sys/netinet6/mld6.c:341
#5 pffasttimo+0x10b sys/kern/uipc_domain.c:288
#6 timeout_run+0xcc sys/kern/kern_timeout.c:678
#7 softclock_thread+0x134 sys/kern/kern_timeout.c:802
#8 proc_trampoline+0x1c

exclusive rwlock netlock r = 0 (0xffffffff8277f740)
#0 witness_lock+0x44d

#1 mld6_fasttimeo+0x1d sys/netinet6/mld6.c:336
#2 pffasttimo+0x10b sys/kern/uipc_domain.c:288
#3 timeout_run+0xcc sys/kern/kern_timeout.c:678
#4 softclock_thread+0x134 sys/kern/kern_timeout.c:802
#5 proc_trampoline+0x1c
shared rwlock timeout r = 0 (0xffffffff827f5070)
#0 witness_lock+0x44d
#1 timeout_run+0xb7 sys/kern/kern_timeout.c:674
#2 softclock_thread+0x134 sys/kern/kern_timeout.c:802
#3 proc_trampoline+0x1c

exclusive kernel_lock &kernel_lock r = 0 (0xffffffff829cd5e8)
#0 witness_lock+0x44d

#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416
#3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433
#4 softclock_thread+0xd9 sys/kern/kern_timeout.c:797
#5 proc_trampoline+0x1c
ddb{0}> show malloc

Type InUse MemUse HighUse Limit Requests Type Lim

devbuf 10147 6456K 6456K 78643K 11237 0
pcb 13 8K 8K 78643K 13 0
rtable 84 2K 3K 78643K 142 0
ifaddr 37 9K 9K 78643K 38 0
counters 42 33K 33K 78643K 42 0
ioctlops 0 0K 4K 78643K 1828 0

mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0

vnodes 1179 74K 74K 78643K 1184 0

UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0

shm 2 1K 1K 78643K 2 0

VM map 2 1K 1K 78643K 2 0

sem 2 0K 0K 78643K 2 0

dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0

file desc 2 4K 12K 78643K 191 0
proc 67 87K 99K 78643K 309 0

NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0

in_multi 22 1K 1K 78643K 22 0
ether_multi 1 0K 0K 78643K 1 0

ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0

ttys 25 122K 122K 78643K 25 0
exec 0 0K 2K 78643K 381 0

tdb 3 0K 0K 78643K 3 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 131 15K 15K 78643K 2409 0
UVM aobj 3 2K 2K 78643K 3 0

memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0

NDP 5 0K 0K 78643K 7 0
temp 29 4186K 4250K 78643K 3550 0
kqueue 10 14K 14K 78643K 10 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools

Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0

rtpcb 120 19 0 16 1 0 1 1 0 8 0
rtentry 112 34 0 1 1 0 1 1 0 8 0
unpcb 128 35 0 20 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpcb 736 7 0 4 1 0 1 1 0 8 0
arp 120 4 0 0 1 0 1 1 0 8 0
inpcb 304 33 0 27 1 0 1 1 0 8 0
nd6 48 3 0 0 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 7 0 0 1 0 1 1 0 8 0
pfstkey 112 7 0 0 1 0 1 1 0 8 0
pfstate 320 7 0 0 1 0 1 1 0 8 0
pfrule 1360 369 0 190 16 1 15 15 0 8 0

art_heap8 4096 1 0 0 1 0 1 1 0 8 0

art_heap4 256 143 0 0 9 0 9 9 0 8 0
art_table 32 144 0 0 2 0 2 2 0 8 0
art_node 16 33 0 3 1 0 1 1 0 8 0

dirhash 1024 17 0 0 3 0 3 3 0 8 0

dino2pl 256 1601 0 201 88 0 88 88 0 8 0
ffsino 272 1601 0 201 94 0 94 94 0 8 0
nchpl 144 1993 0 392 60 0 60 60 0 8 0
uvmvnodes 80 1611 0 0 33 0 33 33 0 8 0
vnodes 224 1611 0 0 95 0 95 95 0 8 0
namei 1024 5583 0 5583 2 1 1 1 0 8 1
percpumem 16 33 0 0 1 0 1 1 0 8 0
scxspl 216 5877 0 5877 2 1 1 2 0 8 1
plimitpl 152 17 0 9 1 0 1 1 0 8 0
sigapl 424 443 0 413 4 0 4 4 0 8 0
knotepl 112 46 0 0 2 0 2 2 0 8 0
kqueuepl 216 6 0 0 1 0 1 1 0 8 0
pipepl 336 81 0 74 2 1 1 1 0 8 0
fdescpl 496 429 0 413 3 0 3 3 0 8 0
filepl 152 1715 0 1645 3 0 3 3 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 19 0 9 1 0 1 1 0 8 0
pgrppl 48 19 0 9 1 0 1 1 0 8 0
ucredpl 96 69 0 57 1 0 1 1 0 8 0
zombiepl 144 413 0 412 2 1 1 1 0 8 0
processpl 1064 443 0 412 3 0 3 3 0 8 0
procpl 672 450 0 412 4 0 4 4 0 8 0
sockpl 480 87 0 63 5 1 4 4 0 8 0
mcl8k 8192 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 57 0 0 8 0 8 8 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 113 0 0 7 0 7 7 0 8 0
bufpl 288 3671 0 137 253 0 253 253 0 8 0
anonpl 24 43300 0 39559 35 3 32 32 0 186 9
amapchunkpl 152 4980 0 4671 16 1 15 15 0 158 2
amappl16 200 530 0 472 4 0 4 4 0 8 0
amappl15 192 7 0 5 1 0 1 1 0 8 0
amappl14 184 3 0 3 2 1 1 1 0 8 1
amappl13 176 24 0 23 2 1 1 1 0 8 0
amappl12 168 10 0 10 1 1 0 1 0 8 0
amappl11 160 45 0 30 1 0 1 1 0 8 0
amappl10 152 220 0 212 1 0 1 1 0 8 0
amappl9 144 443 0 441 1 0 1 1 0 8 0
amappl8 136 299 0 282 2 1 1 1 0 8 0
amappl7 128 63 0 55 1 0 1 1 0 8 0
amappl6 120 136 0 122 1 0 1 1 0 8 0
amappl5 112 508 0 491 1 0 1 1 0 8 0
amappl4 104 545 0 524 1 0 1 1 0 8 0
amappl3 96 154 0 139 1 0 1 1 0 8 0
amappl2 88 359 0 320 2 0 2 2 0 8 1
amappl1 80 9828 0 9411 15 2 13 13 0 8 4
amappl 88 2126 0 2027 3 0 3 3 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 429 0 413 1 0 1 1 0 8 0

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

uaddr 24 429 0 413 1 0 1 1 0 8 0
vmmpekpl 168 7290 0 7270 2 0 2 2 0 8 0
vmmpepl 168 33106 0 32018 67 3 64 64 0 357 15
vmsppl 368 428 0 413 2 0 2 2 0 8 0
rwobjpl 56 10084 0 7759 35 1 34 34 0 8 1
pdppl 4096 866 0 826 61 15 46 46 0 8 6
pvpl 32 184069 0 177518 145 4 141 141 0 265 87
pmappl 248 428 0 413 2 0 2 2 0 8 0

extentpl 40 57 0 38 1 0 1 1 0 8 0

phpool 112 552 0 20 16 0 16 16 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace

db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff8245dec9) at panic+0x177 sys/kern/subr_prf.c:202
unhandled_af(0) at unhandled_af+0x16

ddb{0}> machine ddbcpu 1

Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393

x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23

__mp_lock(ffffffff829cd3e0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff829cd3e0) at __mp_lock+0x122 sys/kern/kern_lock.c:147
__mp_acquire_count(ffffffff829cd3e0,2) at __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
mi_switch() at mi_switch+0x3d3 sys/kern/sched_bsd.c:416
sleep_finish(ffff80002124a0e8,1) at sleep_finish+0x1b2 sys/kern/kern_synch.c:433
msleep(fffffd806f0dfa20,fffffd806f0dfa20,318,ffffffff824b6a1d,1389) at msleep+0x110 sys/kern/kern_synch.c:259
kqueue_sleep(fffffd806f0dfa20,ffff80002124a4d0) at kqueue_sleep+0x107 sys/kern/kern_event.c:1253
kqueue_scan(ffff80002124a3e0,8,ffff80002124a2e0,ffff80002124a4d0,ffff800021192a88,ffff80002124a52c) at kqueue_scan+0x19b sys/kern/kern_event.c:1311
sys_kevent(ffff800021192a88,ffff80002124a590,ffff80002124a5f0) at sys_kevent+0x47b sys/kern/kern_event.c:981
syscall(ffff80002124a660) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002124a660) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585

Xsyscall() at Xsyscall+0x128
end of kernel

end trace frame: 0x2d342fd40, count: 2
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393

x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23

Xsyscall() at Xsyscall+0x128
end of kernel

end trace frame: 0x2d342fd40, count: -13
ddb{1}>

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