panic: Data modified on freelist: word 4 of object 0xffff800000cc8c00 size 0x194 previous type free (0x6563 != 0xdeadbeef)
Stopped at db_enter+0x1c: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*416028 48250 0 0 0 0 syz-executor2850578658
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8277078e) at panic+0x165 sys/kern/subr_prf.c:198
malloc(194,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:362
disk_attach(ffff8000006b5000,ffff8000006b5048) at disk_attach+0x8e sys/kern/subr_disk.c:1082
vndioctl(2902,c0384600,ffff8000216f4150,1,ffff8000ffff2db8) at vndioctl+0xeb6 sys/dev/vnd.c:539
VOP_IOCTL(fffffd806ede1eb8,c0384600,ffff8000216f4150,1,fffffd807f7d77b8,ffff8000ffff2db8) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806f89af00,c0384600,ffff8000216f4150,ffff8000ffff2db8) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525
sys_ioctl(ffff8000ffff2db8,ffff8000216f4260,ffff8000216f42b0) at sys_ioctl+0x49e
syscall(ffff8000216f4330) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d2a35df6d40, count: 5
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 0xffff800000cc8c00 size 0x194 previous type free (0x6563 != 0xdeadbeef)
ddb> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8277078e) at panic+0x165 sys/kern/subr_prf.c:198
malloc(194,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:362
disk_attach(ffff8000006b5000,ffff8000006b5048) at disk_attach+0x8e sys/kern/subr_disk.c:1082
vndioctl(2902,c0384600,ffff8000216f4150,1,ffff8000ffff2db8) at vndioctl+0xeb6 sys/dev/vnd.c:539
VOP_IOCTL(fffffd806ede1eb8,c0384600,ffff8000216f4150,1,fffffd807f7d77b8,ffff8000ffff2db8) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806f89af00,c0384600,ffff8000216f4150,ffff8000ffff2db8) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525
sys_ioctl(ffff8000ffff2db8,ffff8000216f4260,ffff8000216f42b0) at sys_ioctl+0x49e
syscall(ffff8000216f4330) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d2a35df6d40, count: -10
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff8000216f3730
rbx 0xffff800000cc8c00
rdx 0x3fd
rcx 0
rax 0x7c
r8 0x101010101010101
r9 0x8080808080808080
r10 0xf3a5b7cd13330902
r11 0x241d597687c0be36
r12 0
r13 0x51
r14 0
r15 0x1
rip 0xffffffff8162a3fc db_enter+0x1c
cs 0x8
rflags 0x246
rsp 0xffff8000216f3720
ss 0x10
db_enter+0x1c: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor2850578658) pid=416028 stat=onproc
flags process=0 proc=0
pri=51, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff3070,0xffff8000ffff2b10
process=0xffff8000ffff0000 user=0xffff8000216ef000, vmspace=0xfffffd806c4ff740
estcpu=2, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
59715 353826 9277 0 3 0 biowait syz-executor2850578658
74739 305723 66721 0 3 0 biowait syz-executor2850578658
*48250 416028 39420 0 7 0 syz-executor2850578658
82911 266861 82839 0 3 0x80 nanoslp syz-executor2850578658
18738 468578 82839 0 3 0 biowait syz-executor2850578658
39420 445428 82839 0 3 0x80 nanoslp syz-executor2850578658
31976 485573 82839 0 3 0 getblk syz-executor2850578658
66472 450083 82839 0 3 0 getblk syz-executor2850578658
66721 96257 82839 0 3 0x80 nanoslp syz-executor2850578658
96910 67381 82839 0 3 0 getblk syz-executor2850578658
9277 124124 82839 0 3 0x80 nanoslp syz-executor2850578658
82839 306711 77128 0 3 0x82 nanoslp syz-executor2850578658
77128 109598 24205 0 3 0x10008a sigsusp ksh
24205 142820 67500 0 3 0x9a kqread sshd
1559 30100 1 0 3 0x100083 ttyin getty
67500 340612 1 0 3 0x88 kqread sshd
36769 240094 93725 73 3 0x1100090 kqread syslogd
93725 57840 1 0 3 0x100082 netio syslogd
97807 515231 1 0 3 0x100080 kqread resolvd
1482 36110 6684 77 3 0x100092 kqread dhcpleased
91784 295896 6684 77 3 0x100092 kqread dhcpleased
6684 303770 1 0 3 0x80 kqread dhcpleased
63590 147435 0 0 3 0x14200 bored smr
8828 357404 0 0 2 0x14200 zerothread
12171 505880 0 0 3 0x14200 aiodoned aiodoned
60183 291702 0 0 3 0x14200 syncer update
97966 493393 0 0 3 0x14200 cleaner cleaner
17030 290903 0 0 3 0x14200 reaper reaper
71299 207533 0 0 3 0x14200 pgdaemon pagedaemon
13991 79174 0 0 3 0x14200 bored viomb
74055 232697 0 0 3 0x40014200 acpi0 acpi0
95827 455559 0 0 3 0x14200 bored softnet3
88594 147395 0 0 3 0x14200 bored softnet2
85658 276053 0 0 3 0x14200 bored softnet1
97591 117395 0 0 3 0x14200 bored softnet0
18087 484541 0 0 3 0x14200 bored systqmp
52884 381598 0 0 3 0x14200 bored systq
47554 120322 0 0 3 0x40014200 bored softclock
94510 89207 0 0 3 0x40014200 idle0
1 290386 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 10133 6382K 6412K 78643K 11215 0
pcb 13 8K 8K 78643K 13 0
rtable 58 1K 2K 78643K 110 0
pf 12 6K 6K 78643K 12 0
ifaddr 11 5K 5K 78643K 11 0
ifgroup 17 1K 1K 78643K 17 0
counters 20 16K 16K 78643K 20 0
ioctlops 0 0K 2K 78643K 21 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1174 73K 74K 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
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 12548 0
file desc 1 0K 0K 78643K 1 0
proc 55 58K 59K 78643K 246 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 11 0K 0K 78643K 11 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 25 122K 122K 78643K 25 0
exec 0 0K 1K 78643K 243 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 8 62K 64K 78643K 10 0
UVM amap 128 69K 69K 78643K 2185 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 3 0K 0K 78643K 3 0
temp 1 5844K 5908K 78643K 2761 0
kqueue 11 16K 18K 78643K 24 0
SYN cache 2 16K 16K 78643K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 20 0 17 1 0 1 1 0 8 0
rtentry 112 23 0 1 1 0 1 1 0 8 0
unpcb 144 33 0 20 1 0 1 1 0 8 0
syncache 296 5 0 5 2 1 1 1 0 8 1
tcpqe 32 61 0 61 1 1 0 1 0 8 0
tcpcb 808 8 0 5 1 0 1 1 0 8 0
arp 88 2 0 0 1 0 1 1 0 8 0
inpcb 336 26 0 20 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 97 0 0 7 0 7 7 0 8 0
art_table 32 98 0 0 1 0 1 1 0 8 0
art_node 16 22 0 2 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1456 0 52 88 0 88 88 0 8 0
ffsino 240 1457 0 52 83 0 83 83 0 8 0
nchpl 144 1664 0 87 59 0 59 59 0 8 0
uvmvnodes 80 1467 0 0 30 0 30 30 0 8 0
vnodes 216 1467 0 0 82 0 82 82 0 8 0
namei 1024 4372 0 4370 3 1 2 2 0 8 1
kstatmem 264 6 0 0 1 0 1 1 0 8 0
scxspl 216 5708 0 5649 25 18 7 8 0 8 3
plimitpl 152 24 0 10 1 0 1 1 0 8 0
sigapl 424 329 0 288 5 0 5 5 0 8 0
knotepl 120 3377 0 3348 3 1 2 2 0 8 1
kqueuepl 184 20 0 13 1 0 1 1 0 8 0
pipepl 288 87 0 84 2 1 1 1 0 8 0
fdescpl 432 313 0 289 3 0 3 3 0 8 0
filepl 120 1160 0 1101 2 0 2 2 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 25 0 9 1 0 1 1 0 8 0
pgrppl 48 25 0 9 1 0 1 1 0 8 0
ucredpl 104 71 0 60 1 0 1 1 0 8 0
zombiepl 144 289 0 288 2 1 1 1 0 8 0
processpl 1008 329 0 288 7 1 6 6 0 8 0
procpl 696 329 0 288 5 1 4 4 0 8 0
sockpl 456 79 0 57 3 0 3 3 0 8 0
mcl8k 8192 9 0 9 2 1 1 1 0 8 1
mcl4k 4096 5 0 5 2 1 1 1 0 8 1
mcl2k 2048 10799 0 10761 34 24 10 30 0 8 4
mtagpl 96 4 0 4 1 1 0 1 0 8 0
mbufpl 256 17386 0 17344 17 11 6 17 0 8 0
bufpl 288 3155 0 92 219 0 219 219 0 8 0
anonpl 24 173333 0 171070 28 11 17 23 0 188 1
amapchunkpl 152 8142 0 7936 9 1 8 8 0 158 0
amappl16 200 5098 0 5068 8 5 3 5 0 8 0
amappl15 192 14 0 14 1 1 0 1 0 8 0
amappl14 184 127 0 118 1 0 1 1 0 8 0
amappl13 176 22 0 22 1 1 0 1 0 8 0
amappl12 168 801 0 781 1 0 1 1 0 8 0
amappl11 160 53 0 43 1 0 1 1 0 8 0
amappl10 152 27 0 27 2 1 1 1 0 8 1
amappl9 144 125 0 125 1 1 0 1 0 8 0
amappl8 136 44 0 42 1 0 1 1 0 8 0
amappl7 128 32 0 27 1 0 1 1 0 8 0
amappl6 120 151 0 140 1 0 1 1 0 8 0
amappl5 112 81 0 74 1 0 1 1 0 8 0
amappl4 104 455 0 418 2 0 2 2 0 8 1
amappl3 96 2223 0 2178 2 0 2 2 0 8 0
amappl2 88 464 0 422 2 1 1 2 0 8 0
amappl1 80 9018 0 8570 14 3 11 11 0 8 0
amappl 88 1907 0 1824 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 72 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 313 0 289 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 313 0 289 1 0 1 1 0 8 0
vmmpekpl 168 6912 0 6897 1 0 1 1 0 8 0
vmmpepl 168 33791 0 32589 58 3 55 55 0 357 0
vmsppl 368 312 0 289 3 0 3 3 0 8 0
rwobjpl 24 18520 0 16363 15 1 14 14 0 8 0
pdppl 4096 633 0 578 81 22 59 59 0 8 4
pvpl 32 267435 0 262493 59 15 44 51 0 265 1
pmappl 216 312 0 289 2 0 2 2 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 550 0 63 14 0 14 14 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8277078e) at panic+0x165 sys/kern/subr_prf.c:198
malloc(194,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:362
disk_attach(ffff8000006b5000,ffff8000006b5048) at disk_attach+0x8e sys/kern/subr_disk.c:1082
vndioctl(2902,c0384600,ffff8000216f4150,1,ffff8000ffff2db8) at vndioctl+0xeb6 sys/dev/vnd.c:539
VOP_IOCTL(fffffd806ede1eb8,c0384600,ffff8000216f4150,1,fffffd807f7d77b8,ffff8000ffff2db8) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806f89af00,c0384600,ffff8000216f4150,ffff8000ffff2db8) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525
sys_ioctl(ffff8000ffff2db8,ffff8000216f4260,ffff8000216f42b0) at sys_ioctl+0x49e
syscall(ffff8000216f4330) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d2a35df6d40, count: -10
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff8277078e) at panic+0x165 sys/kern/subr_prf.c:198
malloc(194,2,a) at malloc+0xa85 sys/kern/kern_malloc.c:362
disk_attach(ffff8000006b5000,ffff8000006b5048) at disk_attach+0x8e sys/kern/subr_disk.c:1082
vndioctl(2902,c0384600,ffff8000216f4150,1,ffff8000ffff2db8) at vndioctl+0xeb6 sys/dev/vnd.c:539
VOP_IOCTL(fffffd806ede1eb8,c0384600,ffff8000216f4150,1,fffffd807f7d77b8,ffff8000ffff2db8) at VOP_IOCTL+0x91 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd806f89af00,c0384600,ffff8000216f4150,ffff8000ffff2db8) at vn_ioctl+0xbb sys/kern/vfs_vnops.c:525
sys_ioctl(ffff8000ffff2db8,ffff8000216f4260,ffff8000216f42b0) at sys_ioctl+0x49e
syscall(ffff8000216f4330) at syscall+0x4a8 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d2a35df6d40, count: -10