assert "frag->fr_firstoff[index] != NULL" failed in pf_norm.c
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syzbot
1 feb 2021, 03:22:1101/02/21
a syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 69702909 Spacing.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=143af9e8d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=d043455a5346f726f1c4
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+d04345...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "frag->fr_firstoff[index] != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pf_norm.c", line 445
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
219662 11976 0 0 0 0 syz-executor.1
* 21181 11976 0 0 0x4000000 1K syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
end trace frame: 0xffff800022365030, 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
kernel diagnostic assertion "frag->fr_firstoff[index] != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pf_norm.c", line 445
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002232a540,f0,ffff800022365048,0,ffff800022365130) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002232a540,ffff8000223650e0,ffff800022365130) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000223651b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000223651b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4a709c12580, count: -18
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800022364820
rbx 0xffff800022364830
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffffffff81303675 kprintf+0x145
r9 0x1
r10 0x7e9b9ecb592f97c3
r11 0x86e696a903d19152
r12 0x3000000008
r13 0xffff8000223648d0
r14 0x100
r15 0x1
rip 0xffffffff812aa9b8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022364810
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=21181 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff80002232afc0,0xffffffff828bb158
process=0xffff80002232e1d8 user=0xffff800022360000, vmspace=0xfffffd8008496a10
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
11976 219662 6024 0 7 0 syz-executor.1
*11976 21181 6024 0 7 0x4000000 syz-executor.1
22708 181181 39978 0 2 0 syz-executor.0
22708 271811 39978 0 3 0x4000080 fsleep syz-executor.0
63936 258679 0 0 3 0x14280 nfsidl nfsio
68142 450667 0 0 3 0x14280 nfsidl nfsio
9506 129111 0 0 3 0x14280 nfsidl nfsio
52039 515218 0 0 3 0x14280 nfsidl nfsio
12994 161290 0 0 3 0x14280 nfsidl nfsio
17224 211664 0 0 3 0x14280 nfsidl nfsio
15540 404854 0 0 3 0x14280 nfsidl nfsio
86494 98597 0 0 3 0x14280 nfsidl nfsio
98379 516502 0 0 3 0x14280 nfsidl nfsio
23203 513349 0 0 3 0x14280 nfsidl nfsio
51557 383546 0 0 3 0x14280 nfsidl nfsio
55001 330269 0 0 3 0x14280 nfsidl nfsio
35139 68576 0 0 3 0x14280 nfsidl nfsio
26289 111938 0 0 3 0x14280 nfsidl nfsio
4577 371895 0 0 3 0x14280 nfsidl nfsio
16148 221125 0 0 3 0x14280 nfsidl nfsio
72390 343367 0 0 3 0x14280 nfsidl nfsio
15411 433206 0 0 3 0x14280 nfsidl nfsio
58340 262169 0 0 3 0x14280 nfsidl nfsio
14885 31959 0 0 3 0x14280 nfsidl nfsio
6024 512028 54095 0 3 0x82 nanoslp syz-executor.1
39978 513687 54095 0 3 0x82 nanoslp syz-executor.0
54095 124600 53830 0 3 0x82 thrsleep syz-fuzzer
54095 455625 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 231226 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 73411 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 88015 53830 0 3 0x4000082 kqread syz-fuzzer
54095 208596 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 470677 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 300215 53830 0 3 0x4000082 thrsleep syz-fuzzer
53830 387243 10301 0 3 0x10008a sigsusp ksh
10301 173500 85405 0 3 0x92 select sshd
72599 93005 1 0 3 0x100083 ttyin getty
85405 106130 1 0 3 0x80 select sshd
99263 26495 58536 74 3 0x100092 bpf pflogd
58536 460525 1 0 3 0x80 netio pflogd
5352 133255 87918 73 3 0x100090 kqread syslogd
87918 362920 1 0 3 0x100082 netio syslogd
57982 155587 1 77 3 0x100090 poll dhclient
38055 466457 1 0 3 0x80 poll dhclient
51012 148617 0 0 3 0x14200 bored smr
6694 382899 0 0 2 0x14200 zerothread
75913 524011 0 0 3 0x14200 aiodoned aiodoned
72638 220136 0 0 3 0x14200 syncer update
27200 113593 0 0 3 0x14200 cleaner cleaner
3336 69138 0 0 3 0x14200 reaper reaper
89195 180501 0 0 3 0x14200 pgdaemon pagedaemon
91307 93444 0 0 3 0x14200 bored crynlk
19647 38871 0 0 3 0x14200 bored crypto
97809 231822 0 0 3 0x14200 bored viomb
27564 214671 0 0 3 0x40014200 acpi0 acpi0
7570 76801 0 0 3 0x40014200 idle1
86069 474596 0 0 3 0x14200 bored softnet
58146 155460 0 0 3 0x14200 bored systqmp
28181 417727 0 0 3 0x14200 bored systq
69085 131506 0 0 3 0x40014200 bored softclock
18844 436428 0 0 3 0x40014200 idle0
1 389632 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 11976 (syz-executor.1) thread 0xffff80002232a540 (21181)
exclusive rwlock netlock r = 0 (0xffffffff826ff250)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 tun_dev_write+0x1f9 sys/net/if_tun.c:869
#2 spec_write+0xd4 sys/kern/spec_vnops.c:309
#3 VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
#4 vn_write+0x14e sys/kern/vfs_vnops.c:414
#5 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#6 sys_write+0x83 sys/kern/sys_generic.c:285
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828bbd40)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 vn_write+0x42 sys/kern/vfs_vnops.c:399
#2 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#3 sys_write+0x83 sys/kern/sys_generic.c:285
#4 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#5 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9486 6416K 6426K 78643K 12708 0
pcb 13 8K 8K 78643K 77 0
rtable 105 3K 3K 78643K 199 0
ifaddr 44 10K 10K 78643K 45 0
counters 44 34K 34K 78643K 44 0
ioctlops 0 0K 4K 78643K 1633 0
iov 0 0K 0K 78643K 208 0
mount 1 1K 1K 78643K 1 0
vnodes 1224 77K 77K 78643K 2882 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 164 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 333 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 6 17K 25K 78643K 24299 0
sigio 0 0K 0K 78643K 73 0
proc 60 63K 95K 78643K 1292 0
subproc 32 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 33 2K 2K 78643K 33 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 49 228K 228K 78643K 49 0
exec 0 0K 2K 78643K 620 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 139 24K 24K 78643K 52349 0
UVM aobj 131 4K 4K 78643K 182 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 6 0K 0K 78643K 10 0
temp 106 3981K 4045K 78643K 52212 0
kqueue 3 4K 9K 78643K 1665 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 6 0 0 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 120 19 0 17 1 0 1 1 0 8 0
rtentry 112 45 0 1 2 0 2 2 0 8 0
unpcb 120 1757 0 1747 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpcb 736 79 0 75 4 3 1 4 0 8 0
inpcb 304 1203 0 1196 1 0 1 1 0 8 0
nd6 48 6 0 0 1 0 1 1 0 8 0
kcovpl 48 2 0 0 1 0 1 1 0 8 0
pffrag 232 13 0 0 1 0 1 1 0 482 0
pffrnode 88 8 0 0 1 0 1 1 0 8 0
pffrent 40 373 0 358 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 18 0 12 1 0 1 1 0 8 0
pfstkey 112 18 0 12 1 0 1 1 0 8 0
pfstate 328 18 0 12 2 1 1 2 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 256 187 0 0 12 0 12 12 0 8 0
art_table 32 188 0 0 2 0 2 2 0 8 0
art_node 16 44 0 4 1 0 1 1 0 8 0
semapl 112 331 0 321 1 0 1 1 0 8 0
shmpl 112 179 0 51 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 26755 0 25350 88 0 88 88 0 8 0
ffsino 272 26755 0 25350 94 0 94 94 0 8 0
nchpl 144 58712 0 57107 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 143808 0 143808 1 0 1 1 0 8 1
percpumem 16 33 0 0 1 0 1 1 0 8 0
scxspl 216 154668 0 154668 9 8 1 8 0 8 1
plimitpl 152 15 0 7 1 0 1 1 0 8 0
sigapl 424 24535 0 24482 6 0 6 6 0 8 0
futexpl 56 94387 0 94386 1 0 1 1 0 8 0
knotepl 112 1331 0 1311 1 0 1 1 0 8 0
kqueuepl 168 2900 0 2898 1 0 1 1 0 8 0
pipepl 336 4094 0 4083 13 12 1 2 0 8 0
fdescpl 496 24499 0 24482 3 0 3 3 0 8 0
filepl 152 68512 0 68410 6 1 5 6 0 8 0
lockfpl 104 2998 0 2997 1 0 1 1 0 8 0
lockfspl 48 1442 0 1441 1 0 1 1 0 8 0
sessionpl 144 18 0 7 1 0 1 1 0 8 0
pgrppl 48 1915 0 1904 1 0 1 1 0 8 0
ucredpl 96 9963 0 9954 1 0 1 1 0 8 0
zombiepl 144 24482 0 24482 1 0 1 1 0 8 1
processpl 1080 24535 0 24482 4 0 4 4 0 8 0
procpl 672 51798 0 51736 7 1 6 6 0 8 0
sockpl 432 2979 0 2960 3 0 3 3 0 8 0
mcl64k 65536 18 0 0 3 1 2 3 0 8 0
mcl16k 16384 20 0 0 3 0 3 3 0 8 0
mcl12k 12288 25 0 0 2 0 2 2 0 8 0
mcl9k 9216 34 0 0 2 0 2 2 0 8 0
mcl8k 8192 45 0 0 6 2 4 4 0 8 0
mcl4k 4096 33 0 0 4 1 3 3 0 8 0
mcl2k2 2112 5 0 0 1 0 1 1 0 8 0
mcl2k 2048 105 0 0 11 0 11 11 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 591 0 0 15 1 14 14 0 8 0
bufpl 280 27667 0 21418 447 0 447 447 0 8 0
anonpl 24 1469873 0 1464887 35 4 31 31 0 186 0
amapchunkpl 152 79945 0 79774 7 0 7 7 0 158 0
amappl16 200 73459 0 73304 9 0 9 9 0 8 0
amappl15 192 3 0 1 1 0 1 1 0 8 0
amappl14 184 12242 0 12237 1 0 1 1 0 8 0
amappl13 176 12080 0 12075 1 0 1 1 0 8 0
amappl12 168 9 0 7 2 1 1 1 0 8 0
amappl11 160 55 0 38 1 0 1 1 0 8 0
amappl10 152 18 0 13 1 0 1 1 0 8 0
amappl9 144 290 0 288 1 0 1 1 0 8 0
amappl8 136 387 0 313 3 0 3 3 0 8 0
amappl7 128 244 0 236 1 0 1 1 0 8 0
amappl6 120 62 0 54 1 0 1 1 0 8 0
amappl5 112 12488 0 12471 1 0 1 1 0 8 0
amappl4 104 12785 0 12756 2 1 1 2 0 8 0
amappl3 96 13856 0 13846 1 0 1 1 0 8 0
amappl2 88 207847 0 207768 3 1 2 3 0 8 0
amappl1 80 646996 0 646500 26 14 12 21 0 8 0
amappl 88 52029 0 51977 2 0 2 2 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 64 181 0 51 3 0 3 3 0 8 0
uaddrrnd 24 24499 0 24482 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 24499 0 24482 1 0 1 1 0 8 0
vmmpekpl 168 120615 0 120583 2 0 2 2 0 8 0
vmmpepl 168 2960371 0 2958864 112 46 66 77 0 357 0
vmsppl 368 24498 0 24482 2 0 2 2 0 8 0
rwobjpl 56 583657 0 582762 31 18 13 19 0 8 0
pdppl 4096 49005 0 48964 57 16 41 45 0 8 0
pvpl 32 4790899 0 4782143 188 113 75 117 0 265 4
pmappl 232 24498 0 24482 2 1 1 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 322 0 39 9 0 9 9 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff826f0ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff828bbb38) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828bbb38) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffc03b0, count: 9
ddb{0}> trace
x86_ipi_db(ffffffff826f0ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff828bbb38) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828bbb38) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffc03b0, count: -6
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:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
end trace frame: 0xffff800022365030, count: 0
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002232a540,f0,ffff800022365048,0,ffff800022365130) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002232a540,ffff8000223650e0,ffff800022365130) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000223651b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000223651b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4a709c12580, count: -18
---
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 found the following issue on:
HEAD commit: 69702909 Spacing.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=143af9e8d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=d043455a5346f726f1c4
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+d04345...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "frag->fr_firstoff[index] != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pf_norm.c", line 445
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
219662 11976 0 0 0 0 syz-executor.1
* 21181 11976 0 0 0x4000000 1K syz-executor.1
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
end trace frame: 0xffff800022365030, 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
kernel diagnostic assertion "frag->fr_firstoff[index] != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pf_norm.c", line 445
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002232a540,f0,ffff800022365048,0,ffff800022365130) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002232a540,ffff8000223650e0,ffff800022365130) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000223651b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000223651b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4a709c12580, count: -18
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800022364820
rbx 0xffff800022364830
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffffffff81303675 kprintf+0x145
r9 0x1
r10 0x7e9b9ecb592f97c3
r11 0x86e696a903d19152
r12 0x3000000008
r13 0xffff8000223648d0
r14 0x100
r15 0x1
rip 0xffffffff812aa9b8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022364810
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=21181 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff80002232afc0,0xffffffff828bb158
process=0xffff80002232e1d8 user=0xffff800022360000, vmspace=0xfffffd8008496a10
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
11976 219662 6024 0 7 0 syz-executor.1
*11976 21181 6024 0 7 0x4000000 syz-executor.1
22708 181181 39978 0 2 0 syz-executor.0
22708 271811 39978 0 3 0x4000080 fsleep syz-executor.0
63936 258679 0 0 3 0x14280 nfsidl nfsio
68142 450667 0 0 3 0x14280 nfsidl nfsio
9506 129111 0 0 3 0x14280 nfsidl nfsio
52039 515218 0 0 3 0x14280 nfsidl nfsio
12994 161290 0 0 3 0x14280 nfsidl nfsio
17224 211664 0 0 3 0x14280 nfsidl nfsio
15540 404854 0 0 3 0x14280 nfsidl nfsio
86494 98597 0 0 3 0x14280 nfsidl nfsio
98379 516502 0 0 3 0x14280 nfsidl nfsio
23203 513349 0 0 3 0x14280 nfsidl nfsio
51557 383546 0 0 3 0x14280 nfsidl nfsio
55001 330269 0 0 3 0x14280 nfsidl nfsio
35139 68576 0 0 3 0x14280 nfsidl nfsio
26289 111938 0 0 3 0x14280 nfsidl nfsio
4577 371895 0 0 3 0x14280 nfsidl nfsio
16148 221125 0 0 3 0x14280 nfsidl nfsio
72390 343367 0 0 3 0x14280 nfsidl nfsio
15411 433206 0 0 3 0x14280 nfsidl nfsio
58340 262169 0 0 3 0x14280 nfsidl nfsio
14885 31959 0 0 3 0x14280 nfsidl nfsio
6024 512028 54095 0 3 0x82 nanoslp syz-executor.1
39978 513687 54095 0 3 0x82 nanoslp syz-executor.0
54095 124600 53830 0 3 0x82 thrsleep syz-fuzzer
54095 455625 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 231226 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 73411 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 88015 53830 0 3 0x4000082 kqread syz-fuzzer
54095 208596 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 470677 53830 0 3 0x4000082 thrsleep syz-fuzzer
54095 300215 53830 0 3 0x4000082 thrsleep syz-fuzzer
53830 387243 10301 0 3 0x10008a sigsusp ksh
10301 173500 85405 0 3 0x92 select sshd
72599 93005 1 0 3 0x100083 ttyin getty
85405 106130 1 0 3 0x80 select sshd
99263 26495 58536 74 3 0x100092 bpf pflogd
58536 460525 1 0 3 0x80 netio pflogd
5352 133255 87918 73 3 0x100090 kqread syslogd
87918 362920 1 0 3 0x100082 netio syslogd
57982 155587 1 77 3 0x100090 poll dhclient
38055 466457 1 0 3 0x80 poll dhclient
51012 148617 0 0 3 0x14200 bored smr
6694 382899 0 0 2 0x14200 zerothread
75913 524011 0 0 3 0x14200 aiodoned aiodoned
72638 220136 0 0 3 0x14200 syncer update
27200 113593 0 0 3 0x14200 cleaner cleaner
3336 69138 0 0 3 0x14200 reaper reaper
89195 180501 0 0 3 0x14200 pgdaemon pagedaemon
91307 93444 0 0 3 0x14200 bored crynlk
19647 38871 0 0 3 0x14200 bored crypto
97809 231822 0 0 3 0x14200 bored viomb
27564 214671 0 0 3 0x40014200 acpi0 acpi0
7570 76801 0 0 3 0x40014200 idle1
86069 474596 0 0 3 0x14200 bored softnet
58146 155460 0 0 3 0x14200 bored systqmp
28181 417727 0 0 3 0x14200 bored systq
69085 131506 0 0 3 0x40014200 bored softclock
18844 436428 0 0 3 0x40014200 idle0
1 389632 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 11976 (syz-executor.1) thread 0xffff80002232a540 (21181)
exclusive rwlock netlock r = 0 (0xffffffff826ff250)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 tun_dev_write+0x1f9 sys/net/if_tun.c:869
#2 spec_write+0xd4 sys/kern/spec_vnops.c:309
#3 VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
#4 vn_write+0x14e sys/kern/vfs_vnops.c:414
#5 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#6 sys_write+0x83 sys/kern/sys_generic.c:285
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828bbd40)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 vn_write+0x42 sys/kern/vfs_vnops.c:399
#2 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#3 sys_write+0x83 sys/kern/sys_generic.c:285
#4 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#5 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9486 6416K 6426K 78643K 12708 0
pcb 13 8K 8K 78643K 77 0
rtable 105 3K 3K 78643K 199 0
ifaddr 44 10K 10K 78643K 45 0
counters 44 34K 34K 78643K 44 0
ioctlops 0 0K 4K 78643K 1633 0
iov 0 0K 0K 78643K 208 0
mount 1 1K 1K 78643K 1 0
vnodes 1224 77K 77K 78643K 2882 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 164 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 333 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 6 17K 25K 78643K 24299 0
sigio 0 0K 0K 78643K 73 0
proc 60 63K 95K 78643K 1292 0
subproc 32 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 33 2K 2K 78643K 33 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 49 228K 228K 78643K 49 0
exec 0 0K 2K 78643K 620 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 139 24K 24K 78643K 52349 0
UVM aobj 131 4K 4K 78643K 182 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 6 0K 0K 78643K 10 0
temp 106 3981K 4045K 78643K 52212 0
kqueue 3 4K 9K 78643K 1665 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 6 0 0 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 120 19 0 17 1 0 1 1 0 8 0
rtentry 112 45 0 1 2 0 2 2 0 8 0
unpcb 120 1757 0 1747 1 0 1 1 0 8 0
syncache 296 4 0 4 1 1 0 1 0 8 0
tcpcb 736 79 0 75 4 3 1 4 0 8 0
inpcb 304 1203 0 1196 1 0 1 1 0 8 0
nd6 48 6 0 0 1 0 1 1 0 8 0
kcovpl 48 2 0 0 1 0 1 1 0 8 0
pffrag 232 13 0 0 1 0 1 1 0 482 0
pffrnode 88 8 0 0 1 0 1 1 0 8 0
pffrent 40 373 0 358 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 18 0 12 1 0 1 1 0 8 0
pfstkey 112 18 0 12 1 0 1 1 0 8 0
pfstate 328 18 0 12 2 1 1 2 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 256 187 0 0 12 0 12 12 0 8 0
art_table 32 188 0 0 2 0 2 2 0 8 0
art_node 16 44 0 4 1 0 1 1 0 8 0
semapl 112 331 0 321 1 0 1 1 0 8 0
shmpl 112 179 0 51 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 26755 0 25350 88 0 88 88 0 8 0
ffsino 272 26755 0 25350 94 0 94 94 0 8 0
nchpl 144 58712 0 57107 60 0 60 60 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 143808 0 143808 1 0 1 1 0 8 1
percpumem 16 33 0 0 1 0 1 1 0 8 0
scxspl 216 154668 0 154668 9 8 1 8 0 8 1
plimitpl 152 15 0 7 1 0 1 1 0 8 0
sigapl 424 24535 0 24482 6 0 6 6 0 8 0
futexpl 56 94387 0 94386 1 0 1 1 0 8 0
knotepl 112 1331 0 1311 1 0 1 1 0 8 0
kqueuepl 168 2900 0 2898 1 0 1 1 0 8 0
pipepl 336 4094 0 4083 13 12 1 2 0 8 0
fdescpl 496 24499 0 24482 3 0 3 3 0 8 0
filepl 152 68512 0 68410 6 1 5 6 0 8 0
lockfpl 104 2998 0 2997 1 0 1 1 0 8 0
lockfspl 48 1442 0 1441 1 0 1 1 0 8 0
sessionpl 144 18 0 7 1 0 1 1 0 8 0
pgrppl 48 1915 0 1904 1 0 1 1 0 8 0
ucredpl 96 9963 0 9954 1 0 1 1 0 8 0
zombiepl 144 24482 0 24482 1 0 1 1 0 8 1
processpl 1080 24535 0 24482 4 0 4 4 0 8 0
procpl 672 51798 0 51736 7 1 6 6 0 8 0
sockpl 432 2979 0 2960 3 0 3 3 0 8 0
mcl64k 65536 18 0 0 3 1 2 3 0 8 0
mcl16k 16384 20 0 0 3 0 3 3 0 8 0
mcl12k 12288 25 0 0 2 0 2 2 0 8 0
mcl9k 9216 34 0 0 2 0 2 2 0 8 0
mcl8k 8192 45 0 0 6 2 4 4 0 8 0
mcl4k 4096 33 0 0 4 1 3 3 0 8 0
mcl2k2 2112 5 0 0 1 0 1 1 0 8 0
mcl2k 2048 105 0 0 11 0 11 11 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 591 0 0 15 1 14 14 0 8 0
bufpl 280 27667 0 21418 447 0 447 447 0 8 0
anonpl 24 1469873 0 1464887 35 4 31 31 0 186 0
amapchunkpl 152 79945 0 79774 7 0 7 7 0 158 0
amappl16 200 73459 0 73304 9 0 9 9 0 8 0
amappl15 192 3 0 1 1 0 1 1 0 8 0
amappl14 184 12242 0 12237 1 0 1 1 0 8 0
amappl13 176 12080 0 12075 1 0 1 1 0 8 0
amappl12 168 9 0 7 2 1 1 1 0 8 0
amappl11 160 55 0 38 1 0 1 1 0 8 0
amappl10 152 18 0 13 1 0 1 1 0 8 0
amappl9 144 290 0 288 1 0 1 1 0 8 0
amappl8 136 387 0 313 3 0 3 3 0 8 0
amappl7 128 244 0 236 1 0 1 1 0 8 0
amappl6 120 62 0 54 1 0 1 1 0 8 0
amappl5 112 12488 0 12471 1 0 1 1 0 8 0
amappl4 104 12785 0 12756 2 1 1 2 0 8 0
amappl3 96 13856 0 13846 1 0 1 1 0 8 0
amappl2 88 207847 0 207768 3 1 2 3 0 8 0
amappl1 80 646996 0 646500 26 14 12 21 0 8 0
amappl 88 52029 0 51977 2 0 2 2 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 64 181 0 51 3 0 3 3 0 8 0
uaddrrnd 24 24499 0 24482 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 24499 0 24482 1 0 1 1 0 8 0
vmmpekpl 168 120615 0 120583 2 0 2 2 0 8 0
vmmpepl 168 2960371 0 2958864 112 46 66 77 0 357 0
vmsppl 368 24498 0 24482 2 0 2 2 0 8 0
rwobjpl 56 583657 0 582762 31 18 13 19 0 8 0
pdppl 4096 49005 0 48964 57 16 41 45 0 8 0
pvpl 32 4790899 0 4782143 188 113 75 117 0 265 4
pmappl 232 24498 0 24482 2 1 1 2 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 322 0 39 9 0 9 9 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff826f0ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff828bbb38) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828bbb38) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffc03b0, count: 9
ddb{0}> trace
x86_ipi_db(ffffffff826f0ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:352
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(ffffffff828bbb38) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff828bbb38) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:90
Xsoftclock() at Xsoftclock+0x1f
end of kernel
end trace frame: 0x7f7ffffc03b0, count: -6
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:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
end trace frame: 0xffff800022365030, count: 0
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd80689a23a0,fffffd80689a3ca8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
pf_fillup_fragment(ffff800022364a00,0,fffffd80689a3b40,ffff800022364c4e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff800022364b78,1,ffff800022364c4e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff800022364b38,ffff800022364c4e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff800022364d58) at pf_test+0x30c
ip_input_if(ffff800022364d58,ffff800022364d64,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd8071644e00) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d01,ffff800022365048,ffff8000232c6000,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff800022364ea0) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e30d248,ffff800022365048,11,fffffd807f7b7420) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806716ae60,ffff800022365048,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002232a540,f0,ffff800022365048,0,ffff800022365130) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002232a540,ffff8000223650e0,ffff800022365130) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000223651b0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000223651b0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x4a709c12580, count: -18
---
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
1 feb 2021, 04:03:1201/02/21
a syzkaller-o...@googlegroups.com
syzbot has found a reproducer for the following issue on:
HEAD commit: 69702909 Spacing.
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=16ca8a08d00000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d04345...@syzkaller.appspotmail.com
login: panic: kernel diagnostic assertion "frag->fr_firstoff[index] != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pf_norm.c", line 445
329621 12245 0 0x2 0 1 syz-executor.0
pf_fillup_fragment(ffff8000212af4f0,0,fffffd806b0a4e88,ffff8000212af73e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff8000212af668,1,ffff8000212af73e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff8000212af628,ffff8000212af73e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff8000212af848) at pf_test+0x30c
ip_input_if(ffff8000212af848,ffff8000212af854,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd807f008200) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d00,ffff8000212afb38,11,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff8000212af990) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e289328,ffff8000212afb38,11,fffffd807f7b7ae0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806cd08ee8,ffff8000212afb38,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
end trace frame: 0xffff8000212afb20, count: 0
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
pf_fillup_fragment(ffff8000212af4f0,0,fffffd806b0a4e88,ffff8000212af73e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff8000212af668,1,ffff8000212af73e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff8000212af628,ffff8000212af73e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff8000212af848) at pf_test+0x30c
ip_input_if(ffff8000212af848,ffff8000212af854,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd807f008200) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d00,ffff8000212afb38,11,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff8000212af990) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e289328,ffff8000212afb38,11,fffffd807f7b7ae0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806cd08ee8,ffff8000212afb38,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002123d500,f0,ffff8000212afb38,0,ffff8000212afc20) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002123d500,ffff8000212afbd0,ffff8000212afc20) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000212afca0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212afca0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000212af310
rbx 0xffff8000212af320
r11 0x54cf983c7815c18
r12 0x3000000008
r13 0xffff8000212af3c0
PROC (syz-executor.0) pid=22828 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff80002123cfc0,0xffffffff828bb158
process=0xffff800021234cb8 user=0xffff8000212aa000, vmspace=0xfffffd8008496000
*74437 22828 12245 0 7 0x4000000 syz-executor.0
12245 329621 64759 0 7 0x2 syz-executor.0
64759 241603 10447 0 3 0x82 thrsleep syz-execprog
64759 483044 10447 0 3 0x4000082 thrsleep syz-execprog
64759 361059 10447 0 3 0x4000082 thrsleep syz-execprog
64759 464821 10447 0 3 0x4000082 thrsleep syz-execprog
64759 118997 10447 0 3 0x4000082 kqread syz-execprog
64759 157375 10447 0 3 0x4000082 thrsleep syz-execprog
64759 141489 10447 0 3 0x4000082 thrsleep syz-execprog
10447 361606 53974 0 3 0x10008a sigsusp ksh
53974 376090 5264 0 3 0x92 select sshd
32864 446448 1 0 3 0x100083 ttyin getty
5264 500348 1 0 3 0x80 select sshd
49831 281352 34244 74 3 0x100092 bpf pflogd
34244 519156 1 0 3 0x80 netio pflogd
9131 386064 59870 73 3 0x100090 kqread syslogd
59870 205442 1 0 3 0x100082 netio syslogd
39253 177076 1 77 3 0x100090 poll dhclient
66786 145160 1 0 3 0x80 poll dhclient
32659 166016 0 0 3 0x14200 bored smr
49387 524041 0 0 3 0x14200 pgzero zerothread
30667 193957 0 0 3 0x14200 aiodoned aiodoned
99354 167774 0 0 3 0x14200 syncer update
74628 277384 0 0 3 0x14200 cleaner cleaner
89200 167298 0 0 3 0x14200 reaper reaper
2220 274171 0 0 3 0x14200 pgdaemon pagedaemon
49140 382571 0 0 3 0x14200 bored crynlk
87337 147243 0 0 3 0x14200 bored crypto
34555 83953 0 0 3 0x14200 bored viomb
37988 73177 0 0 3 0x40014200 acpi0 acpi0
10218 376706 0 0 3 0x40014200 idle1
8908 502652 0 0 3 0x14200 bored softnet
55080 105122 0 0 3 0x14200 bored systqmp
67511 19501 0 0 3 0x14200 bored systq
63497 339500 0 0 3 0x40014200 bored softclock
74719 6219 0 0 3 0x40014200 idle0
1 222903 0 0 3 0x82 wait init
Process 74437 (syz-executor.0) thread 0xffff80002123d500 (22828)
pcb 13 8K 8K 78643K 13 0
rtable 83 2K 2K 78643K 163 0
ifaddr 37 9K 9K 78643K 38 0
counters 42 33K 33K 78643K 42 0
ioctlops 0 0K 4K 78643K 1468 0
proc 59 63K 83K 78643K 407 0
exec 0 0K 2K 78643K 339 0
UVM aobj 3 2K 2K 78643K 3 0
temp 28 3969K 4033K 78643K 1903 0
kqueue 3 4K 4K 78643K 3 0
rtentry 112 34 0 1 1 0 1 1 0 8 0
unpcb 120 29 0 19 1 0 1 1 0 8 0
syncache 296 5 0 5 1 0 1 1 0 8 1
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 736 8 0 4 1 0 1 1 0 8 0
inpcb 304 33 0 26 1 0 1 1 0 8 0
nd6 48 3 0 0 1 0 1 1 0 8 0
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 6 0 3 1 0 1 1 0 8 0
pfstkey 112 10 0 0 1 0 1 1 0 8 0
pfstate 328 10 0 0 1 0 1 1 0 8 0
art_table 32 145 0 0 2 0 2 2 0 8 0
art_node 16 33 0 3 1 0 1 1 0 8 0
ffsino 272 1423 0 23 94 0 94 94 0 8 0
nchpl 144 1640 0 42 60 0 60 60 0 8 0
uvmvnodes 72 1433 0 0 27 0 27 27 0 8 0
vnodes 224 1433 0 0 85 0 85 85 0 8 0
namei 1024 4182 0 4182 1 0 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
scxspl 216 4537 0 4537 2 1 1 2 0 8 1
plimitpl 152 15 0 8 1 0 1 1 0 8 0
sigapl 424 243 0 212 4 0 4 4 0 8 0
futexpl 56 5 0 5 1 0 1 1 0 8 1
knotepl 112 48 0 36 1 0 1 1 0 8 0
kqueuepl 168 2 0 0 1 0 1 1 0 8 0
pipepl 336 78 0 70 1 0 1 1 0 8 0
fdescpl 496 227 0 212 3 0 3 3 0 8 0
filepl 152 1078 0 1018 3 0 3 3 0 8 0
lockfpl 104 5 0 4 1 0 1 1 0 8 0
lockfspl 48 3 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 62 0 53 1 0 1 1 0 8 0
zombiepl 144 212 0 212 1 0 1 1 0 8 1
processpl 1080 243 0 212 3 0 3 3 0 8 0
procpl 672 251 0 213 4 0 4 4 0 8 0
sockpl 432 79 0 60 3 0 3 3 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 77 0 0 10 0 10 10 0 8 0
bufpl 280 3233 0 181 218 0 218 218 0 8 0
anonpl 24 23777 0 21526 24 2 22 22 0 186 8
amapchunkpl 152 841 0 758 6 1 5 5 0 158 1
amappl16 200 178 0 113 4 0 4 4 0 8 0
amappl15 192 3 0 0 1 0 1 1 0 8 0
amappl14 184 31 0 24 1 0 1 1 0 8 0
amappl13 176 20 0 19 1 0 1 1 0 8 0
amappl12 168 5 0 5 1 1 0 1 0 8 0
amappl11 160 52 0 36 1 0 1 1 0 8 0
amappl10 152 12 0 9 1 0 1 1 0 8 0
amappl9 144 238 0 238 1 0 1 1 0 8 1
amappl8 136 101 0 81 1 0 1 1 0 8 0
amappl7 128 234 0 229 1 0 1 1 0 8 0
amappl6 120 63 0 54 1 0 1 1 0 8 0
amappl5 112 369 0 350 1 0 1 1 0 8 0
amappl4 104 299 0 274 1 0 1 1 0 8 0
amappl3 96 123 0 114 1 0 1 1 0 8 0
amappl2 88 984 0 919 3 0 3 3 0 8 1
amappl1 80 15695 0 15234 27 6 21 21 0 8 9
amappl 88 475 0 443 1 0 1 1 0 92 0
uaddrrnd 24 227 0 212 1 0 1 1 0 8 0
vmmpekpl 168 6539 0 6519 2 0 2 2 0 8 1
vmmpepl 168 33958 0 32890 83 6 77 77 0 357 30
vmsppl 368 226 0 212 2 0 2 2 0 8 0
rwobjpl 56 9271 0 8581 24 5 19 19 0 8 8
pdppl 4096 461 0 424 53 12 41 41 0 8 4
pvpl 32 119245 0 114367 117 0 117 117 0 265 77
pmappl 232 226 0 212 1 0 1 1 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
pf_fillup_fragment(ffff8000212af4f0,0,fffffd806b0a4e88,ffff8000212af73e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff8000212af668,1,ffff8000212af73e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff8000212af628,ffff8000212af73e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff8000212af848) at pf_test+0x30c
ip_input_if(ffff8000212af848,ffff8000212af854,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd807f008200) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d00,ffff8000212afb38,11,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff8000212af990) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e289328,ffff8000212afb38,11,fffffd807f7b7ae0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806cd08ee8,ffff8000212afb38,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002123d500,f0,ffff8000212afb38,0,ffff8000212afc20) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002123d500,ffff8000212afbd0,ffff8000212afc20) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000212afca0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212afca0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
HEAD commit: 69702909 Spacing.
git tree: openbsd
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=d043455a5346f726f1c4
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12baf9e8d00000
dashboard link: https://syzkaller.appspot.com/bug?extid=d043455a5346f726f1c4
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d04345...@syzkaller.appspotmail.com
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 22828 74437 0 0 0x4000000 0 syz-executor.0
TID PID UID PRFLAGS PFLAGS CPU COMMAND
329621 12245 0 0x2 0 1 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd806b0f7d98,fffffd806b0a4ed8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_fillup_fragment(ffff8000212af4f0,0,fffffd806b0a4e88,ffff8000212af73e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff8000212af668,1,ffff8000212af73e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff8000212af628,ffff8000212af73e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff8000212af848) at pf_test+0x30c
ip_input_if(ffff8000212af848,ffff8000212af854,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd807f008200) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d00,ffff8000212afb38,11,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff8000212af990) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e289328,ffff8000212afb38,11,fffffd807f7b7ae0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806cd08ee8,ffff8000212afb38,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
end trace frame: 0xffff8000212afb20, 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}>
reports. Insufficient info makes it difficult to find and fix bugs.
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
kernel diagnostic assertion "frag->fr_firstoff[index] != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/pf_norm.c", line 445
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd806b0f7d98,fffffd806b0a4ed8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_fillup_fragment(ffff8000212af4f0,0,fffffd806b0a4e88,ffff8000212af73e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff8000212af668,1,ffff8000212af73e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff8000212af628,ffff8000212af73e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff8000212af848) at pf_test+0x30c
ip_input_if(ffff8000212af848,ffff8000212af854,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd807f008200) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d00,ffff8000212afb38,11,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff8000212af990) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e289328,ffff8000212afb38,11,fffffd807f7b7ae0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806cd08ee8,ffff8000212afb38,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002123d500,f0,ffff8000212afb38,0,ffff8000212afc20) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002123d500,ffff8000212afbd0,ffff8000212afc20) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000212afca0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212afca0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdedc7f57150, count: -18
end of kernel
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000212af310
rbx 0xffff8000212af320
rdx 0x8b
rcx 0x2
rax 0x1
r8 0xffffffff81303675 kprintf+0x145
r9 0x1
r10 0xdb5370867d7abee3
rcx 0x2
rax 0x1
r8 0xffffffff81303675 kprintf+0x145
r9 0x1
r11 0x54cf983c7815c18
r12 0x3000000008
r13 0xffff8000212af3c0
r14 0x100
r15 0x1
rip 0xffffffff812aa9b8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000212af300
r15 0x1
rip 0xffffffff812aa9b8 db_enter+0x18
cs 0x8
rflags 0x246
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
db_enter+0x18: addq $0x8,%rsp
PROC (syz-executor.0) pid=22828 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff80002123cfc0,0xffffffff828bb158
process=0xffff800021234cb8 user=0xffff8000212aa000, vmspace=0xfffffd8008496000
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
user=0, sys=1, intr=0
PID TID PPID UID S FLAGS WAIT COMMAND
74437 26837 12245 0 2 0 syz-executor.0
*74437 22828 12245 0 7 0x4000000 syz-executor.0
12245 329621 64759 0 7 0x2 syz-executor.0
64759 241603 10447 0 3 0x82 thrsleep syz-execprog
64759 483044 10447 0 3 0x4000082 thrsleep syz-execprog
64759 361059 10447 0 3 0x4000082 thrsleep syz-execprog
64759 464821 10447 0 3 0x4000082 thrsleep syz-execprog
64759 118997 10447 0 3 0x4000082 kqread syz-execprog
64759 157375 10447 0 3 0x4000082 thrsleep syz-execprog
64759 141489 10447 0 3 0x4000082 thrsleep syz-execprog
10447 361606 53974 0 3 0x10008a sigsusp ksh
53974 376090 5264 0 3 0x92 select sshd
32864 446448 1 0 3 0x100083 ttyin getty
5264 500348 1 0 3 0x80 select sshd
49831 281352 34244 74 3 0x100092 bpf pflogd
34244 519156 1 0 3 0x80 netio pflogd
9131 386064 59870 73 3 0x100090 kqread syslogd
59870 205442 1 0 3 0x100082 netio syslogd
39253 177076 1 77 3 0x100090 poll dhclient
66786 145160 1 0 3 0x80 poll dhclient
32659 166016 0 0 3 0x14200 bored smr
49387 524041 0 0 3 0x14200 pgzero zerothread
30667 193957 0 0 3 0x14200 aiodoned aiodoned
99354 167774 0 0 3 0x14200 syncer update
74628 277384 0 0 3 0x14200 cleaner cleaner
89200 167298 0 0 3 0x14200 reaper reaper
2220 274171 0 0 3 0x14200 pgdaemon pagedaemon
49140 382571 0 0 3 0x14200 bored crynlk
87337 147243 0 0 3 0x14200 bored crypto
34555 83953 0 0 3 0x14200 bored viomb
37988 73177 0 0 3 0x40014200 acpi0 acpi0
10218 376706 0 0 3 0x40014200 idle1
8908 502652 0 0 3 0x14200 bored softnet
55080 105122 0 0 3 0x14200 bored systqmp
67511 19501 0 0 3 0x14200 bored systq
63497 339500 0 0 3 0x40014200 bored softclock
74719 6219 0 0 3 0x40014200 idle0
1 222903 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 74437 (syz-executor.0) thread 0xffff80002123d500 (22828)
exclusive rwlock netlock r = 0 (0xffffffff826ff250)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 tun_dev_write+0x1f9 sys/net/if_tun.c:869
#2 spec_write+0xd4 sys/kern/spec_vnops.c:309
#3 VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
#4 vn_write+0x14e sys/kern/vfs_vnops.c:414
#5 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#6 sys_write+0x83 sys/kern/sys_generic.c:285
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828bbd40)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 vn_write+0x42 sys/kern/vfs_vnops.c:399
#2 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#3 sys_write+0x83 sys/kern/sys_generic.c:285
#4 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#5 Xsyscall+0x128
ddb{0}> show malloc
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 tun_dev_write+0x1f9 sys/net/if_tun.c:869
#2 spec_write+0xd4 sys/kern/spec_vnops.c:309
#3 VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
#4 vn_write+0x14e sys/kern/vfs_vnops.c:414
#5 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#6 sys_write+0x83 sys/kern/sys_generic.c:285
#7 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#8 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff828bbd40)
#0 witness_lock+0x4b0 stacktrace_save sys/sys/stacktrace.h:36 [inline]
#0 witness_lock+0x4b0 sys/kern/subr_witness.c:1182
#1 vn_write+0x42 sys/kern/vfs_vnops.c:399
#2 dofilewritev+0x1ab sys/kern/sys_generic.c:365
#3 sys_write+0x83 sys/kern/sys_generic.c:285
#4 syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
#5 Xsyscall+0x128
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9478 6414K 6414K 78643K 10568 0
pcb 13 8K 8K 78643K 13 0
rtable 83 2K 2K 78643K 163 0
ifaddr 37 9K 9K 78643K 38 0
counters 42 33K 33K 78643K 42 0
ioctlops 0 0K 4K 78643K 1468 0
mount 1 1K 1K 78643K 1 0
vnodes 1183 74K 75K 78643K 1188 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
UFS mount 5 36K 36K 78643K 5 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 3 8K 12K 78643K 19 0
ACPI 1697 195K 286K 78643K 12598 0
proc 59 63K 83K 78643K 407 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
NFS daemon 1 16K 16K 78643K 1 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 19 95K 95K 78643K 19 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
exec 0 0K 2K 78643K 339 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 61 11K 11K 78643K 703 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 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 7 0K 0K 78643K 7 0
crypto data 1 1K 1K 78643K 1 0
temp 28 3969K 4033K 78643K 1903 0
kqueue 3 4K 4K 78643K 3 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
arp 64 4 0 0 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 120 17 0 15 1 0 1 1 0 8 0
rtentry 112 34 0 1 1 0 1 1 0 8 0
unpcb 120 29 0 19 1 0 1 1 0 8 0
syncache 296 5 0 5 1 0 1 1 0 8 1
tcpqe 32 1 0 1 1 1 0 1 0 8 0
tcpcb 736 8 0 4 1 0 1 1 0 8 0
inpcb 304 33 0 26 1 0 1 1 0 8 0
nd6 48 3 0 0 1 0 1 1 0 8 0
pffrag 232 1 0 0 1 0 1 1 0 482 0
pffrnode 88 1 0 0 1 0 1 1 0 8 0
pffrent 40 6 0 3 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 10 0 0 1 0 1 1 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstkey 112 10 0 0 1 0 1 1 0 8 0
pfstate 328 10 0 0 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 256 144 0 0 9 0 9 9 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_table 32 145 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 1423 0 23 88 0 88 88 0 8 0
ffsino 272 1423 0 23 94 0 94 94 0 8 0
nchpl 144 1640 0 42 60 0 60 60 0 8 0
uvmvnodes 72 1433 0 0 27 0 27 27 0 8 0
vnodes 224 1433 0 0 85 0 85 85 0 8 0
namei 1024 4182 0 4182 1 0 1 1 0 8 1
percpumem 16 32 0 0 1 0 1 1 0 8 0
scxspl 216 4537 0 4537 2 1 1 2 0 8 1
plimitpl 152 15 0 8 1 0 1 1 0 8 0
sigapl 424 243 0 212 4 0 4 4 0 8 0
futexpl 56 5 0 5 1 0 1 1 0 8 1
knotepl 112 48 0 36 1 0 1 1 0 8 0
kqueuepl 168 2 0 0 1 0 1 1 0 8 0
pipepl 336 78 0 70 1 0 1 1 0 8 0
fdescpl 496 227 0 212 3 0 3 3 0 8 0
filepl 152 1078 0 1018 3 0 3 3 0 8 0
lockfpl 104 5 0 4 1 0 1 1 0 8 0
lockfspl 48 3 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 62 0 53 1 0 1 1 0 8 0
zombiepl 144 212 0 212 1 0 1 1 0 8 1
processpl 1080 243 0 212 3 0 3 3 0 8 0
procpl 672 251 0 213 4 0 4 4 0 8 0
sockpl 432 79 0 60 3 0 3 3 0 8 0
mcl8k 8192 4 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 77 0 0 10 0 10 10 0 8 0
mtagpl 96 1 0 0 1 0 1 1 0 8 0
mbufpl 256 95 0 0 6 0 6 6 0 8 0
bufpl 280 3233 0 181 218 0 218 218 0 8 0
anonpl 24 23777 0 21526 24 2 22 22 0 186 8
amapchunkpl 152 841 0 758 6 1 5 5 0 158 1
amappl16 200 178 0 113 4 0 4 4 0 8 0
amappl15 192 3 0 0 1 0 1 1 0 8 0
amappl14 184 31 0 24 1 0 1 1 0 8 0
amappl13 176 20 0 19 1 0 1 1 0 8 0
amappl12 168 5 0 5 1 1 0 1 0 8 0
amappl11 160 52 0 36 1 0 1 1 0 8 0
amappl10 152 12 0 9 1 0 1 1 0 8 0
amappl9 144 238 0 238 1 0 1 1 0 8 1
amappl8 136 101 0 81 1 0 1 1 0 8 0
amappl7 128 234 0 229 1 0 1 1 0 8 0
amappl6 120 63 0 54 1 0 1 1 0 8 0
amappl5 112 369 0 350 1 0 1 1 0 8 0
amappl4 104 299 0 274 1 0 1 1 0 8 0
amappl3 96 123 0 114 1 0 1 1 0 8 0
amappl2 88 984 0 919 3 0 3 3 0 8 1
amappl1 80 15695 0 15234 27 6 21 21 0 8 9
amappl 88 475 0 443 1 0 1 1 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 64 2 0 0 1 0 1 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
uaddrrnd 24 227 0 212 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 227 0 212 1 0 1 1 0 8 0
vmmpekpl 168 6539 0 6519 2 0 2 2 0 8 1
vmmpepl 168 33958 0 32890 83 6 77 77 0 357 30
vmsppl 368 226 0 212 2 0 2 2 0 8 0
rwobjpl 56 9271 0 8581 24 5 19 19 0 8 8
pdppl 4096 461 0 424 53 12 41 41 0 8 4
pvpl 32 119245 0 114367 117 0 117 117 0 265 77
pmappl 232 226 0 212 1 0 1 1 0 8 0
extentpl 40 58 0 40 1 0 1 1 0 8 0
phpool 112 276 0 15 8 0 8 8 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:398
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_frent_remove(fffffd806b0f7d98,fffffd806b0a4ed8) at pf_frent_remove+0x2a4 sys/net/pf_norm.c:466
panic(ffffffff823bccba) at panic+0x15e sys/kern/subr_prf.c:218
__assert(ffffffff8242c052,ffffffff824492a2,1bd,ffffffff823aebf1) at __assert+0x2b sys/kern/subr_prf.c:162
pf_fillup_fragment(ffff8000212af4f0,0,fffffd806b0a4e88,ffff8000212af73e) at pf_fillup_fragment+0xbeb sys/net/pf_norm.c:685
pf_reassemble(ffff8000212af668,1,ffff8000212af73e) at pf_reassemble+0xda sys/net/pf_norm.c:787
pf_normalize_ip(ffff8000212af628,ffff8000212af73e) at pf_normalize_ip+0x11d sys/net/pf_norm.c:1057
pf_test(2,1,ffff800000ae5000,ffff8000212af848) at pf_test+0x30c
ip_input_if(ffff8000212af848,ffff8000212af854,4,0,ffff800000ae5000) at ip_input_if+0x578 sys/netinet/ip_input.c:338
ipv4_input(ffff800000ae5000,fffffd807f008200) at ipv4_input+0x48 sys/netinet/ip_input.c:237
tun_dev_write(5d00,ffff8000212afb38,11,2) at tun_dev_write+0x204 sys/net/if_tun.c:870
spec_write(ffff8000212af990) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd806e289328,ffff8000212afb38,11,fffffd807f7b7ae0) at VOP_WRITE+0xc6 sys/kern/vfs_vops.c:274
vn_write(fffffd806cd08ee8,ffff8000212afb38,0) at vn_write+0x14e sys/kern/vfs_vnops.c:414
dofilewritev(ffff80002123d500,f0,ffff8000212afb38,0,ffff8000212afc20) at dofilewritev+0x1ab sys/kern/sys_generic.c:365
sys_write(ffff80002123d500,ffff8000212afbd0,ffff8000212afc20) at sys_write+0x83 sys/kern/sys_generic.c:285
syscall(ffff8000212afca0) at syscall+0x4a1 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff8000212afca0) at syscall+0x4a1 sys/arch/amd64/amd64/trap.c:590
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xdedc7f57150, count: -18
end of kernel
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