malloc: free list modified: counters
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syzbot
Feb 22, 2022, 4:38:19 PM2/22/22
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 2cb6a2195c02 Make audio(4) event filters MP-safe
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=105715ca700000
kernel config: https://syzkaller.appspot.com/x/.config?x=fe55924c11e64b0a
dashboard link: https://syzkaller.appspot.com/bug?extid=96e869ea1a7879d50e49
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+96e869...@syzkaller.appspotmail.com
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Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*309913 91515 0 0 0x4000000 0 syz-executor.2
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: 4
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: Data modified on freelist: word 4 of object 0xffff800000cf9e00 size 0x120 previous type counters (0x6563 != 0xdeafbead)
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: -11
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff8000240d3600
rbx 0xffff800000cf9e00
rdx 0
rcx 0
rax 0xffff8000215fca88
r8 0x101010101010101
r9 0x8080808080808080
r10 0x6c610143560b1a29
r11 0x262e1542ee332f24
r12 0
r13 0x51
r14 0
r15 0x1
rip 0xffffffff81d67f88 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000240d35f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor.2) pid=309913 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=84, usrpri=84, nice=20
forw=0xffffffffffffffff, list=0xffff8000215eefc0,0xffff8000215fcfd8
process=0xffff800021692408 user=0xffff8000240ce000, vmspace=0xfffffd80622dddd8
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
91515 221867 93953 0 2 0 syz-executor.2
*91515 309913 93953 0 7 0x4000000 syz-executor.2
91515 269226 93953 0 2 0x4000000 syz-executor.2
22268 276889 4471 0 2 0 syz-executor.3
22268 361432 4471 0 3 0x4000080 fsleep syz-executor.3
30053 454678 71415 0 2 0 syz-executor.6
30053 58200 71415 0 3 0x4000080 fsleep syz-executor.6
2667 2225 74619 0 3 0x80 nanoslp syz-executor.0
2667 118559 74619 0 3 0x4000080 fsleep syz-executor.0
2667 165392 74619 0 2 0x4000000 syz-executor.0
2667 23663 74619 0 2 0x4000000 syz-executor.0
79705 504574 51755 0 3 0x82 nanoslp syz-executor.5
93953 396460 51755 0 3 0x82 nanoslp syz-executor.2
71415 97608 51755 0 3 0x82 nanoslp syz-executor.6
4471 511873 51755 0 3 0x82 nanoslp syz-executor.3
51779 249396 51755 0 3 0x82 nanoslp syz-executor.1
74157 475518 51755 0 3 0x82 nanoslp syz-executor.7
85081 357721 51755 0 3 0x2 biowait syz-executor.4
5431 45255 0 0 3 0x14200 bored sosplice
16233 44438 0 0 3 0x14280 nfsidl nfsio
31386 203884 0 0 3 0x14280 nfsidl nfsio
43730 521801 0 0 3 0x14280 nfsidl nfsio
62249 378457 0 0 3 0x14280 nfsidl nfsio
29222 240673 0 0 3 0x14280 nfsidl nfsio
8239 371553 0 0 3 0x14280 nfsidl nfsio
76310 67080 0 0 3 0x14280 nfsidl nfsio
62931 251219 0 0 3 0x14280 nfsidl nfsio
44838 281601 0 0 3 0x14280 nfsidl nfsio
10961 423816 0 0 3 0x14280 nfsidl nfsio
95982 70332 0 0 3 0x14280 nfsidl nfsio
63264 260783 0 0 3 0x14280 nfsidl nfsio
20124 438063 0 0 3 0x14280 nfsidl nfsio
60811 211312 0 0 3 0x14280 nfsidl nfsio
13553 361883 0 0 3 0x14280 nfsidl nfsio
67790 144062 0 0 3 0x14280 nfsidl nfsio
28892 250086 0 0 3 0x14280 nfsidl nfsio
57410 347653 0 0 3 0x14280 nfsidl nfsio
6848 342080 0 0 3 0x14280 nfsidl nfsio
77846 64233 0 0 3 0x14280 nfsidl nfsio
74619 451998 51755 0 3 0x82 nanoslp syz-executor.0
51755 267388 15568 0 3 0x82 kqread syz-fuzzer
51755 234783 15568 0 3 0x4000082 nanoslp syz-fuzzer
51755 373041 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 491803 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 178644 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 75872 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 240247 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 215485 15568 0 3 0x4000082 thrsleep syz-fuzzer
15568 348014 66647 0 3 0x10008a sigsusp ksh
66647 457698 71923 0 3 0x9a kqread sshd
82102 244208 1 0 3 0x100083 ttyin getty
71923 160870 1 0 3 0x88 kqread sshd
62576 272224 16227 73 3 0x1100090 kqread syslogd
16227 274393 1 0 3 0x100082 netio syslogd
5800 301037 1 0 3 0x100080 kqread resolvd
67895 379692 15944 77 3 0x100092 kqread dhcpleased
11772 53449 15944 77 3 0x100092 kqread dhcpleased
15944 356292 1 0 3 0x80 kqread dhcpleased
26098 466544 0 0 3 0x14200 bored smr
36146 272561 0 0 2 0x14200 zerothread
61041 11613 0 0 3 0x14200 aiodoned aiodoned
74226 131933 0 0 3 0x14200 syncer update
32651 396246 0 0 3 0x14200 cleaner cleaner
73874 504293 0 0 3 0x14200 reaper reaper
55604 432899 0 0 3 0x14200 pgdaemon pagedaemon
37304 93267 0 0 3 0x14200 bored viomb
21714 32938 0 0 3 0x40014200 acpi0 acpi0
3673 269521 0 0 3 0x14200 bored softnet
53714 506117 0 0 3 0x14200 bored systqmp
3757 167328 0 0 3 0x14200 bored systq
46630 364267 0 0 3 0x40014200 bored softclock
384 464612 0 0 3 0x40014200 idle0
1 240713 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10307 6653K 7064K 78643K 19259 0
pcb 18 18K 20K 78643K 1035 0
rtable 243 10K 12K 78643K 2338 0
ifaddr 91 20K 21K 78643K 836 0
sysctl 2 0K 0K 78643K 4 0
counters 28 17K 17K 78643K 131 0
ioctlops 0 0K 4K 78643K 1584 0
iov 0 0K 32K 78643K 4788 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1428 89K 89K 78643K 4833 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 34 0
VM map 2 0K 0K 78643K 2 0
sem 21 3K 5K 78643K 509 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 14 49K 81K 78643K 6855 0
sigio 0 0K 0K 78643K 85 0
proc 59 55K 71K 78643K 2035 0
subproc 104 6K 6K 78643K 715 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 176 0
in_multi 99 6K 6K 78643K 834 0
ether_multi 1 0K 0K 78643K 83 0
mrt 0 0K 0K 78643K 16 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 187 837K 837K 78643K 187 0
exec 0 0K 2K 78643K 2399 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 359 285K 288K 78643K 82588 0
UVM aobj 71 4K 4K 78643K 71 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 2 0K 0K 78643K 435 0
NDP 12 0K 1K 78643K 235 0
temp 149 4733K 4809K 78643K 60836 0
kqueue 12 18K 30K 78643K 459 0
SYN cache 2 12K 20K 78643K 3 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 581 0 578 11 10 1 3 0 8 0
rtentry 112 696 0 591 4 0 4 4 0 8 0
unpcb 136 4363 0 4350 39 38 1 8 0 8 0
syncache 296 20 0 20 7 7 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 91 8 91 2 2 0 1 0 8 0
tcpcb 736 1797 0 1781 68 66 2 10 0 8 0
arp 88 114 0 95 1 0 1 1 0 8 0
ipq 40 11 0 11 2 2 0 1 0 8 0
ipqe 40 180 0 180 2 2 0 1 0 8 0
inpcb 304 4924 0 4905 93 87 6 14 0 8 4
rttmr 72 5 0 5 2 2 0 1 0 8 0
ip6q 72 5 0 5 3 2 1 1 0 8 1
ip6af 40 9 0 9 3 2 1 1 0 8 1
nd6 48 188 0 161 1 0 1 1 0 8 0
pkpcb 40 19 0 19 5 5 0 1 0 8 0
kcovpl 48 55 0 47 1 0 1 1 0 8 0
ppxss 1152 27 0 27 5 5 0 1 0 8 0
pfstscr 40 5 0 5 1 1 0 1 0 8 0
pfrktable 1344 104 0 98 4 3 1 1 0 8 0
pftag 88 6 0 2 1 0 1 1 0 8 0
pfstkey 112 18 0 18 2 2 0 1 0 8 0
pfstate 320 9 0 9 2 2 0 1 0 8 0
pfrule 1360 227 0 210 5 3 2 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 2922 0 2515 44 18 26 30 0 8 0
art_table 32 2923 0 2515 4 0 4 4 0 8 0
art_node 16 691 0 599 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0
semapl 112 501 0 482 1 0 1 1 0 8 0
shmpl 112 68 0 0 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 10855 0 9406 91 0 91 91 0 8 0
ffsino 240 10855 0 9406 86 0 86 86 0 8 0
nchpl 144 21159 0 19536 62 0 62 62 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 78956 0 78955 5 4 1 2 0 8 0
vcpupl 1984 13 0 0 2 0 2 2 0 8 0
vmpool 528 26 0 13 2 1 1 1 0 8 0
pfiaddrpl 120 40 0 29 3 2 1 1 0 8 0
scsiplug 72 1 0 1 1 1 0 1 0 8 0
scxspl 216 75107 0 75106 24 22 2 8 0 8 1
plimitpl 152 799 0 785 1 0 1 1 0 8 0
sigapl 424 7067 0 7005 8 0 8 8 0 8 0
futexpl 64 60436 0 60433 6 5 1 1 0 8 0
knotepl 120 62604 0 62524 13 10 3 6 0 8 0
kqueuepl 184 1941 0 1933 35 31 4 6 0 8 3
pipepl 304 1201 0 1172 31 28 3 8 0 8 0
fdescpl 432 7032 0 7007 5 1 4 4 0 8 0
filepl 120 51757 0 51466 81 71 10 17 0 8 1
lockfpl 104 3135 0 3133 7 5 2 2 0 8 1
lockfspl 48 746 0 744 1 0 1 1 0 8 0
sessionpl 144 70 0 54 1 0 1 1 0 8 0
pgrppl 48 73 0 57 1 0 1 1 0 8 0
ucredpl 96 3770 0 3758 1 0 1 1 0 8 0
zombiepl 144 7008 0 7005 1 0 1 1 0 8 0
processpl 1000 7067 0 7005 9 0 9 9 0 8 0
procpl 672 17713 0 17637 22 14 8 9 0 8 1
sosppl 168 17 0 17 5 5 0 1 0 8 0
sockpl 448 9899 0 9867 196 185 11 26 0 8 7
mcl64k 65536 628 0 628 12 11 1 1 0 8 1
mcl16k 16384 187 0 187 15 14 1 1 0 8 1
mcl12k 12288 296 0 296 14 13 1 1 0 8 1
mcl9k 9216 101 0 101 19 18 1 1 0 8 1
mcl8k 8192 257 0 257 12 11 1 1 0 8 1
mcl4k 4096 555 0 555 9 8 1 1 0 8 1
mcl2k2 2112 47 0 47 15 14 1 1 0 8 1
mcl2k 2048 91584 0 91528 16 6 10 12 0 8 1
mtagpl 96 1201 0 974 13 7 6 7 0 8 0
mbufpl 256 193356 0 192935 82 52 30 40 0 8 0
bufpl 288 19281 0 12872 458 0 458 458 0 8 0
anonpl 24 1952041 0 1933614 203 68 135 154 0 188 7
amapchunkpl 152 200191 0 199456 88 53 35 44 0 158 1
amappl16 200 19311 0 18588 104 63 41 50 0 8 1
amappl15 192 949 0 944 1 0 1 1 0 8 0
amappl14 184 256 0 252 1 0 1 1 0 8 0
amappl13 176 1135 0 1128 1 0 1 1 0 8 0
amappl12 168 414 0 411 1 0 1 1 0 8 0
amappl11 160 974 0 961 1 0 1 1 0 8 0
amappl10 152 1796 0 1788 1 0 1 1 0 8 0
amappl9 144 1822 0 1818 1 0 1 1 0 8 0
amappl8 136 1805 0 1728 3 0 3 3 0 8 0
amappl7 128 605 0 596 1 0 1 1 0 8 0
amappl6 120 1706 0 1682 2 1 1 2 0 8 0
amappl5 112 7402 0 7389 1 0 1 1 0 8 0
amappl4 104 3306 0 3278 2 1 1 2 0 8 0
amappl3 96 1690 0 1673 1 0 1 1 0 8 0
amappl2 88 2151 0 2103 3 1 2 3 0 8 0
amappl1 80 125767 0 125249 18 5 13 18 0 8 0
amappl 88 81299 0 81063 7 0 7 7 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 70 0 0 2 0 2 2 0 8 0
uaddrrnd 24 7058 0 7020 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 7058 0 7020 1 0 1 1 0 8 0
vmmpekpl 168 54643 0 54593 3 0 3 3 0 8 0
vmmpepl 168 661437 0 658964 268 134 134 146 0 357 8
vmsppl 272 7057 0 7020 5 2 3 3 0 8 0
rwobjpl 24 156930 0 149278 49 2 47 48 0 8 0
pdppl 4096 14122 0 14053 527 450 77 77 0 8 8
pvpl 32 3587298 0 3564514 390 140 250 266 0 265 45
pmappl 216 7057 0 7020 3 0 3 3 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 1638 0 832 24 0 24 24 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: -11
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: -11
---
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.
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syzbot found the following issue on:
HEAD commit: 2cb6a2195c02 Make audio(4) event filters MP-safe
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=105715ca700000
kernel config: https://syzkaller.appspot.com/x/.config?x=fe55924c11e64b0a
dashboard link: https://syzkaller.appspot.com/bug?extid=96e869ea1a7879d50e49
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+96e869...@syzkaller.appspotmail.com
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Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*309913 91515 0 0 0x4000000 0 syz-executor.2
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: 4
https://www.openbsd.org/ddb.html describes the minimum info required in bug
reports. Insufficient info makes it difficult to find and fix bugs.
ddb>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: Data modified on freelist: word 4 of object 0xffff800000cf9e00 size 0x120 previous type counters (0x6563 != 0xdeafbead)
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: -11
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff8000240d3600
rbx 0xffff800000cf9e00
rdx 0
rcx 0
rax 0xffff8000215fca88
r8 0x101010101010101
r9 0x8080808080808080
r10 0x6c610143560b1a29
r11 0x262e1542ee332f24
r12 0
r13 0x51
r14 0
r15 0x1
rip 0xffffffff81d67f88 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000240d35f0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor.2) pid=309913 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=84, usrpri=84, nice=20
forw=0xffffffffffffffff, list=0xffff8000215eefc0,0xffff8000215fcfd8
process=0xffff800021692408 user=0xffff8000240ce000, vmspace=0xfffffd80622dddd8
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
91515 221867 93953 0 2 0 syz-executor.2
*91515 309913 93953 0 7 0x4000000 syz-executor.2
91515 269226 93953 0 2 0x4000000 syz-executor.2
22268 276889 4471 0 2 0 syz-executor.3
22268 361432 4471 0 3 0x4000080 fsleep syz-executor.3
30053 454678 71415 0 2 0 syz-executor.6
30053 58200 71415 0 3 0x4000080 fsleep syz-executor.6
2667 2225 74619 0 3 0x80 nanoslp syz-executor.0
2667 118559 74619 0 3 0x4000080 fsleep syz-executor.0
2667 165392 74619 0 2 0x4000000 syz-executor.0
2667 23663 74619 0 2 0x4000000 syz-executor.0
79705 504574 51755 0 3 0x82 nanoslp syz-executor.5
93953 396460 51755 0 3 0x82 nanoslp syz-executor.2
71415 97608 51755 0 3 0x82 nanoslp syz-executor.6
4471 511873 51755 0 3 0x82 nanoslp syz-executor.3
51779 249396 51755 0 3 0x82 nanoslp syz-executor.1
74157 475518 51755 0 3 0x82 nanoslp syz-executor.7
85081 357721 51755 0 3 0x2 biowait syz-executor.4
5431 45255 0 0 3 0x14200 bored sosplice
16233 44438 0 0 3 0x14280 nfsidl nfsio
31386 203884 0 0 3 0x14280 nfsidl nfsio
43730 521801 0 0 3 0x14280 nfsidl nfsio
62249 378457 0 0 3 0x14280 nfsidl nfsio
29222 240673 0 0 3 0x14280 nfsidl nfsio
8239 371553 0 0 3 0x14280 nfsidl nfsio
76310 67080 0 0 3 0x14280 nfsidl nfsio
62931 251219 0 0 3 0x14280 nfsidl nfsio
44838 281601 0 0 3 0x14280 nfsidl nfsio
10961 423816 0 0 3 0x14280 nfsidl nfsio
95982 70332 0 0 3 0x14280 nfsidl nfsio
63264 260783 0 0 3 0x14280 nfsidl nfsio
20124 438063 0 0 3 0x14280 nfsidl nfsio
60811 211312 0 0 3 0x14280 nfsidl nfsio
13553 361883 0 0 3 0x14280 nfsidl nfsio
67790 144062 0 0 3 0x14280 nfsidl nfsio
28892 250086 0 0 3 0x14280 nfsidl nfsio
57410 347653 0 0 3 0x14280 nfsidl nfsio
6848 342080 0 0 3 0x14280 nfsidl nfsio
77846 64233 0 0 3 0x14280 nfsidl nfsio
74619 451998 51755 0 3 0x82 nanoslp syz-executor.0
51755 267388 15568 0 3 0x82 kqread syz-fuzzer
51755 234783 15568 0 3 0x4000082 nanoslp syz-fuzzer
51755 373041 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 491803 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 178644 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 75872 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 240247 15568 0 3 0x4000082 thrsleep syz-fuzzer
51755 215485 15568 0 3 0x4000082 thrsleep syz-fuzzer
15568 348014 66647 0 3 0x10008a sigsusp ksh
66647 457698 71923 0 3 0x9a kqread sshd
82102 244208 1 0 3 0x100083 ttyin getty
71923 160870 1 0 3 0x88 kqread sshd
62576 272224 16227 73 3 0x1100090 kqread syslogd
16227 274393 1 0 3 0x100082 netio syslogd
5800 301037 1 0 3 0x100080 kqread resolvd
67895 379692 15944 77 3 0x100092 kqread dhcpleased
11772 53449 15944 77 3 0x100092 kqread dhcpleased
15944 356292 1 0 3 0x80 kqread dhcpleased
26098 466544 0 0 3 0x14200 bored smr
36146 272561 0 0 2 0x14200 zerothread
61041 11613 0 0 3 0x14200 aiodoned aiodoned
74226 131933 0 0 3 0x14200 syncer update
32651 396246 0 0 3 0x14200 cleaner cleaner
73874 504293 0 0 3 0x14200 reaper reaper
55604 432899 0 0 3 0x14200 pgdaemon pagedaemon
37304 93267 0 0 3 0x14200 bored viomb
21714 32938 0 0 3 0x40014200 acpi0 acpi0
3673 269521 0 0 3 0x14200 bored softnet
53714 506117 0 0 3 0x14200 bored systqmp
3757 167328 0 0 3 0x14200 bored systq
46630 364267 0 0 3 0x40014200 bored softclock
384 464612 0 0 3 0x40014200 idle0
1 240713 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10307 6653K 7064K 78643K 19259 0
pcb 18 18K 20K 78643K 1035 0
rtable 243 10K 12K 78643K 2338 0
ifaddr 91 20K 21K 78643K 836 0
sysctl 2 0K 0K 78643K 4 0
counters 28 17K 17K 78643K 131 0
ioctlops 0 0K 4K 78643K 1584 0
iov 0 0K 32K 78643K 4788 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1428 89K 89K 78643K 4833 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 34 0
VM map 2 0K 0K 78643K 2 0
sem 21 3K 5K 78643K 509 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 14 49K 81K 78643K 6855 0
sigio 0 0K 0K 78643K 85 0
proc 59 55K 71K 78643K 2035 0
subproc 104 6K 6K 78643K 715 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 176 0
in_multi 99 6K 6K 78643K 834 0
ether_multi 1 0K 0K 78643K 83 0
mrt 0 0K 0K 78643K 16 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 187 837K 837K 78643K 187 0
exec 0 0K 2K 78643K 2399 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 359 285K 288K 78643K 82588 0
UVM aobj 71 4K 4K 78643K 71 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 2 0K 0K 78643K 435 0
NDP 12 0K 1K 78643K 235 0
temp 149 4733K 4809K 78643K 60836 0
kqueue 12 18K 30K 78643K 459 0
SYN cache 2 12K 20K 78643K 3 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 581 0 578 11 10 1 3 0 8 0
rtentry 112 696 0 591 4 0 4 4 0 8 0
unpcb 136 4363 0 4350 39 38 1 8 0 8 0
syncache 296 20 0 20 7 7 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 91 8 91 2 2 0 1 0 8 0
tcpcb 736 1797 0 1781 68 66 2 10 0 8 0
arp 88 114 0 95 1 0 1 1 0 8 0
ipq 40 11 0 11 2 2 0 1 0 8 0
ipqe 40 180 0 180 2 2 0 1 0 8 0
inpcb 304 4924 0 4905 93 87 6 14 0 8 4
rttmr 72 5 0 5 2 2 0 1 0 8 0
ip6q 72 5 0 5 3 2 1 1 0 8 1
ip6af 40 9 0 9 3 2 1 1 0 8 1
nd6 48 188 0 161 1 0 1 1 0 8 0
pkpcb 40 19 0 19 5 5 0 1 0 8 0
kcovpl 48 55 0 47 1 0 1 1 0 8 0
ppxss 1152 27 0 27 5 5 0 1 0 8 0
pfstscr 40 5 0 5 1 1 0 1 0 8 0
pfrktable 1344 104 0 98 4 3 1 1 0 8 0
pftag 88 6 0 2 1 0 1 1 0 8 0
pfstkey 112 18 0 18 2 2 0 1 0 8 0
pfstate 320 9 0 9 2 2 0 1 0 8 0
pfrule 1360 227 0 210 5 3 2 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 2922 0 2515 44 18 26 30 0 8 0
art_table 32 2923 0 2515 4 0 4 4 0 8 0
art_node 16 691 0 599 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 3 1 0 1 1 0 8 0
semapl 112 501 0 482 1 0 1 1 0 8 0
shmpl 112 68 0 0 2 0 2 2 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 10855 0 9406 91 0 91 91 0 8 0
ffsino 240 10855 0 9406 86 0 86 86 0 8 0
nchpl 144 21159 0 19536 62 0 62 62 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 78956 0 78955 5 4 1 2 0 8 0
vcpupl 1984 13 0 0 2 0 2 2 0 8 0
vmpool 528 26 0 13 2 1 1 1 0 8 0
pfiaddrpl 120 40 0 29 3 2 1 1 0 8 0
scsiplug 72 1 0 1 1 1 0 1 0 8 0
scxspl 216 75107 0 75106 24 22 2 8 0 8 1
plimitpl 152 799 0 785 1 0 1 1 0 8 0
sigapl 424 7067 0 7005 8 0 8 8 0 8 0
futexpl 64 60436 0 60433 6 5 1 1 0 8 0
knotepl 120 62604 0 62524 13 10 3 6 0 8 0
kqueuepl 184 1941 0 1933 35 31 4 6 0 8 3
pipepl 304 1201 0 1172 31 28 3 8 0 8 0
fdescpl 432 7032 0 7007 5 1 4 4 0 8 0
filepl 120 51757 0 51466 81 71 10 17 0 8 1
lockfpl 104 3135 0 3133 7 5 2 2 0 8 1
lockfspl 48 746 0 744 1 0 1 1 0 8 0
sessionpl 144 70 0 54 1 0 1 1 0 8 0
pgrppl 48 73 0 57 1 0 1 1 0 8 0
ucredpl 96 3770 0 3758 1 0 1 1 0 8 0
zombiepl 144 7008 0 7005 1 0 1 1 0 8 0
processpl 1000 7067 0 7005 9 0 9 9 0 8 0
procpl 672 17713 0 17637 22 14 8 9 0 8 1
sosppl 168 17 0 17 5 5 0 1 0 8 0
sockpl 448 9899 0 9867 196 185 11 26 0 8 7
mcl64k 65536 628 0 628 12 11 1 1 0 8 1
mcl16k 16384 187 0 187 15 14 1 1 0 8 1
mcl12k 12288 296 0 296 14 13 1 1 0 8 1
mcl9k 9216 101 0 101 19 18 1 1 0 8 1
mcl8k 8192 257 0 257 12 11 1 1 0 8 1
mcl4k 4096 555 0 555 9 8 1 1 0 8 1
mcl2k2 2112 47 0 47 15 14 1 1 0 8 1
mcl2k 2048 91584 0 91528 16 6 10 12 0 8 1
mtagpl 96 1201 0 974 13 7 6 7 0 8 0
mbufpl 256 193356 0 192935 82 52 30 40 0 8 0
bufpl 288 19281 0 12872 458 0 458 458 0 8 0
anonpl 24 1952041 0 1933614 203 68 135 154 0 188 7
amapchunkpl 152 200191 0 199456 88 53 35 44 0 158 1
amappl16 200 19311 0 18588 104 63 41 50 0 8 1
amappl15 192 949 0 944 1 0 1 1 0 8 0
amappl14 184 256 0 252 1 0 1 1 0 8 0
amappl13 176 1135 0 1128 1 0 1 1 0 8 0
amappl12 168 414 0 411 1 0 1 1 0 8 0
amappl11 160 974 0 961 1 0 1 1 0 8 0
amappl10 152 1796 0 1788 1 0 1 1 0 8 0
amappl9 144 1822 0 1818 1 0 1 1 0 8 0
amappl8 136 1805 0 1728 3 0 3 3 0 8 0
amappl7 128 605 0 596 1 0 1 1 0 8 0
amappl6 120 1706 0 1682 2 1 1 2 0 8 0
amappl5 112 7402 0 7389 1 0 1 1 0 8 0
amappl4 104 3306 0 3278 2 1 1 2 0 8 0
amappl3 96 1690 0 1673 1 0 1 1 0 8 0
amappl2 88 2151 0 2103 3 1 2 3 0 8 0
amappl1 80 125767 0 125249 18 5 13 18 0 8 0
amappl 88 81299 0 81063 7 0 7 7 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 70 0 0 2 0 2 2 0 8 0
uaddrrnd 24 7058 0 7020 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 7058 0 7020 1 0 1 1 0 8 0
vmmpekpl 168 54643 0 54593 3 0 3 3 0 8 0
vmmpepl 168 661437 0 658964 268 134 134 146 0 357 8
vmsppl 272 7057 0 7020 5 2 3 3 0 8 0
rwobjpl 24 156930 0 149278 49 2 47 48 0 8 0
pdppl 4096 14122 0 14053 527 450 77 77 0 8 8
pvpl 32 3587298 0 3564514 390 140 250 266 0 265 45
pmappl 216 7057 0 7020 3 0 3 3 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 1638 0 832 24 0 24 24 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: -11
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82544063) at panic+0x161 sys/kern/subr_prf.c:202
malloc(120,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:364
bpfopen(2d1700,1,2000,ffff8000215fca88) at bpfopen+0xb0 sys/net/bpf.c:386
spec_open_clone(ffff8000240d38e8) at spec_open_clone+0x204
spec_open(ffff8000240d38e8) at spec_open+0x3f5 sys/kern/spec_vnops.c:155
VOP_OPEN(fffffd807eab1ab0,1,fffffd807f7d8840,ffff8000215fca88) at VOP_OPEN+0x6c sys/kern/vfs_vops.c:138
vn_open(ffff8000240d3b38,1,0) at vn_open+0x467 sys/kern/vfs_vnops.c:183
doopenat(ffff8000215fca88,ffffff9c,200001c0,0,0,ffff8000240d3d20) at doopenat+0x26a sys/kern/vfs_syscalls.c:1129
syscall(ffff8000240d3d90) at syscall+0x44e sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc20fb42df70, count: -11
---
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.
David Gwynne
Feb 24, 2022, 8:14:43 PM2/24/22
to syzbot, 'Dmitry Vyukov' via syzkaller-openbsd-bugs
The only user of M_COUNTERS is counters_alloc(9) and counters_free(9). For a use after free, there therefore has to be counters_free calls. There are only a small handful of these:
dlg@bgp0 sys$ grep -r counters_free .
./kern/subr_percpu.c:counters_free(struct cpumem *cm, unsigned int n)
./kern/subr_percpu.c:counters_free(struct cpumem *cm, unsigned int n)
./net/if.c: if_counters_free(ifp);
./net/if.c:if_counters_free(struct ifnet *ifp)
./net/if.c: counters_free(ifp->if_counters, ifc_ncounters);
./net/if_var.h:void if_counters_free(struct ifnet *);
./net/pipex.c: counters_free(session->stat_counters, pxc_ncounters);
./netinet/ip_ipsp.c: counters_free(tdbp->tdb_counters, tdb_ncounters);
./sys/percpu.h:void counters_free(struct cpumem *, unsigned int);
./kern/subr_percpu.c:counters_free(struct cpumem *cm, unsigned int n)
./kern/subr_percpu.c:counters_free(struct cpumem *cm, unsigned int n)
./net/if.c: if_counters_free(ifp);
./net/if.c:if_counters_free(struct ifnet *ifp)
./net/if.c: counters_free(ifp->if_counters, ifc_ncounters);
./net/if_var.h:void if_counters_free(struct ifnet *);
./net/pipex.c: counters_free(session->stat_counters, pxc_ncounters);
./netinet/ip_ipsp.c: counters_free(tdbp->tdb_counters, tdb_ncounters);
./sys/percpu.h:void counters_free(struct cpumem *, unsigned int);
so if_counters_free, pipex, and ip_ipsp.
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syzbot
Feb 7, 2023, 1:00:31 PM2/7/23
to lo...@animata.net, syzkaller-o...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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