panic: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/main/kernel/sys/net/if_tun.c", line 303
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*464013 60152 0 0 0x4000000 0 syz-executor.3
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82728421) at panic+0x161 sys/kern/subr_prf.c:198
__assert(ffffffff827a20ae,ffffffff827d17fa,12f,ffffffff827b21bf) at __assert+0x25 sys/kern/subr_prf.c:157
tun_clone_destroy(ffff800000e1a000) at tun_clone_destroy+0x234 sys/net/if_tun.c:303
if_clone_destroy(ffff80002e90c3c0) at if_clone_destroy+0x132 sys/net/if.c:1247
sys_ioctl(ffff8000fffec030,ffff80002e90c4d8,ffff80002e90c520) at sys_ioctl+0x49e
syscall(ffff80002e90c5a0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc6fc06cc190, count: 7
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: kernel diagnostic assertion "sc->sc_dev == 0" failed: file "/syzkaller/managers/main/kernel/sys/net/if_tun.c", line 303
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82728421) at panic+0x161 sys/kern/subr_prf.c:198
__assert(ffffffff827a20ae,ffffffff827d17fa,12f,ffffffff827b21bf) at __assert+0x25 sys/kern/subr_prf.c:157
tun_clone_destroy(ffff800000e1a000) at tun_clone_destroy+0x234 sys/net/if_tun.c:303
if_clone_destroy(ffff80002e90c3c0) at if_clone_destroy+0x132 sys/net/if.c:1247
sys_ioctl(ffff8000fffec030,ffff80002e90c4d8,ffff80002e90c520) at sys_ioctl+0x49e
syscall(ffff80002e90c5a0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc6fc06cc190, count: -8
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff80002e90c250
rbx 0x80206979 __kernel_virt_to_phys+0x206979
rdx 0xffff800000d16dc0
rcx 0
rax 0xffff8000fffec030
r8 0
r9 0x8080808080808080
r10 0xb2c3246237bce052
r11 0xca9f5a14da7718e6
r12 0
r13 0
r14 0
r15 0x1
rip 0xffffffff814a7c88 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002e90c240
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (syz-executor.3) pid=464013 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=32, usrpri=84, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff5060,0xffffffff82c99480
process=0xffff8000fffef7b0 user=0xffff80002e907000, vmspace=0xfffffd806b9e8450
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
60152 421883 81853 0 2 0x480 syz-executor.3
*60152 464013 81853 0 7 0x4000000 syz-executor.3
20718 430638 1 0 3 0x100083 ttyin getty
21047 424188 37896 0 3 0x82 piperd syz-executor.5
70754 217321 37896 0 3 0x82 piperd syz-executor.0
64256 371646 37896 0 3 0x82 piperd syz-executor.4
51022 350515 37896 0 3 0x82 piperd syz-executor.7
51288 9515 0 0 3 0x14200 acct acct
7556 348878 37896 0 3 0x82 piperd syz-executor.2
19911 283258 0 0 3 0x14280 nfsidl nfsio
75418 79696 0 0 3 0x14280 nfsidl nfsio
93419 507548 0 0 3 0x14280 nfsidl nfsio
96294 239276 0 0 3 0x14280 nfsidl nfsio
71677 71930 0 0 3 0x14280 nfsidl nfsio
47149 396845 0 0 3 0x14280 nfsidl nfsio
70417 363266 0 0 3 0x14280 nfsidl nfsio
31674 522687 0 0 3 0x14280 nfsidl nfsio
54140 261371 0 0 3 0x14280 nfsidl nfsio
65057 27280 0 0 3 0x14280 nfsidl nfsio
2208 443809 0 0 3 0x14280 nfsidl nfsio
37691 309736 0 0 3 0x14280 nfsidl nfsio
89275 24682 0 0 3 0x14280 nfsidl nfsio
4842 146662 0 0 3 0x14280 nfsidl nfsio
41306 155073 0 0 3 0x14280 nfsidl nfsio
75122 350526 0 0 3 0x14280 nfsidl nfsio
5231 398653 0 0 3 0x14280 nfsidl nfsio
50928 171054 0 0 3 0x14280 nfsidl nfsio
40380 11589 0 0 3 0x14280 nfsidl nfsio
17140 333414 0 0 3 0x14280 nfsidl nfsio
61057 160444 37896 0 2 0x482 syz-executor.6
81853 497950 37896 0 2 0x482 syz-executor.3
46106 9606 0 0 3 0x14200 bored sosplice
37896 132255 42814 0 3 0x82 thrsleep syz-fuzzer
37896 337456 42814 0 2 0x4000482 syz-fuzzer
37896 111393 42814 0 3 0x4000082 wait syz-fuzzer
37896 443989 42814 0 3 0x4000082 wait syz-fuzzer
37896 120264 42814 0 3 0x4000082 thrsleep syz-fuzzer
37896 182225 42814 0 3 0x4000082 thrsleep syz-fuzzer
37896 154065 42814 0 3 0x4000082 wait syz-fuzzer
37896 135013 42814 0 3 0x4000082 thrsleep syz-fuzzer
37896 68073 42814 0 2 0x4000002 syz-fuzzer
37896 137959 42814 0 3 0x4000082 thrsleep syz-fuzzer
37896 321542 42814 0 3 0x4000082 wait syz-fuzzer
37896 156815 42814 0 3 0x4000082 wait syz-fuzzer
37896 1453 42814 0 3 0x4000082 wait syz-fuzzer
37896 465074 42814 0 3 0x4000082 thrsleep syz-fuzzer
37896 396384 42814 0 3 0x4000082 wait syz-fuzzer
42814 335506 26359 0 3 0x10008a sigsusp ksh
26359 343550 86865 0 3 0x9a kqread sshd
86865 171350 1 0 3 0x88 kqread sshd
50275 304392 25935 73 3 0x1100090 kqread syslogd
25935 54881 1 0 3 0x100082 netio syslogd
13074 357992 1 0 3 0x100080 kqread resolvd
51964 203009 88866 77 2 0x100012 dhcpleased
18628 403728 88866 77 3 0x100092 kqread dhcpleased
88866 50575 1 0 3 0x80 kqread dhcpleased
66655 275326 0 0 3 0x14200 bored smr
16084 266708 0 0 2 0x14200 zerothread
93281 156338 0 0 3 0x14200 aiodoned aiodoned
95773 157841 0 0 3 0x14200 syncer update
74222 115843 0 0 3 0x14200 cleaner cleaner
29656 328136 0 0 3 0x14200 reaper reaper
1429 289233 0 0 3 0x14200 pgdaemon pagedaemon
78491 244588 0 0 3 0x14200 bored viomb
49282 87379 0 0 3 0x40014200 acpi0 acpi0
9107 363464 0 0 3 0x14200 bored softnet
16329 332910 0 0 3 0x14200 bored softnet
46696 427270 0 0 3 0x14200 bored softnet
95389 199290 0 0 3 0x14200 bored softnet
71 277280 0 0 3 0x14200 bored systqmp
43423 370877 0 0 3 0x14200 bored systq
23468 150307 0 0 3 0x40014200 bored softclock
51854 309849 0 0 3 0x40014200 idle0
1 523455 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 10232 6438K 7019K 78643K 39781 0
pcb 13 18K 20K 78643K 3029 0
rtable 169 15K 17K 78643K 4820 0
ifaddr 86 27K 30K 78643K 1875 0
sysctl 3 1K 5K 78643K 47 0
counters 26 17K 17K 78643K 789 0
ioctlops 0 0K 4K 78643K 2040 0
iov 0 0K 36K 78643K 2346 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1552 97K 98K 78643K 15958 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 154 0
VM map 2 0K 0K 78643K 2 0
sem 23 3K 5K 78643K 2493 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 10 33K 73K 78643K 18235 0
sigio 0 0K 0K 78643K 394 0
proc 63 59K 83K 78643K 3863 0
subproc 91 5K 10K 78643K 1442 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 988 0
in_multi 65 4K 6K 78643K 1554 0
ether_multi 1 0K 0K 78643K 90 0
mrt 1 0K 0K 78643K 95 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 283 1261K 1261K 78643K 283 0
exec 0 0K 1K 78643K 3663 0
pfkey data 0 0K 0K 78643K 13 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 318 87K 110K 78643K 115549 0
UVM aobj 131 4K 6K 78643K 140 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 1063 0
NDP 12 0K 1K 78643K 626 0
temp 126 5770K 39574K 78643K 173347 0
kqueue 12 18K 28K 78643K 1318 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 1606 0 1603 19 18 1 4 0 8 0
rtentry 112 1483 0 1415 4 1 3 4 0 8 0
unpcb 144 21477 0 21463 183 179 4 11 0 8 3
syncache 296 133 0 133 31 31 0 1 0 8 0
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 282 50 282 8 8 0 1 0 8 0
tcpcb 776 11918 0 11908 207 199 8 15 0 8 6
arp 88 222 0 209 1 0 1 1 0 8 0
ipq 40 7 0 7 3 3 0 1 0 8 0
ipqe 40 50 0 50 3 3 0 1 0 8 0
inpcb 336 21944 0 21931 266 259 7 13 0 8 5
ip6q 72 151 0 151 6 5 1 1 0 8 1
ip6af 40 302 0 302 6 5 1 1 0 8 1
nd6 48 341 0 326 1 0 1 1 0 8 0
pkpcb 40 24 0 24 6 6 0 1 0 8 0
kcovpl 48 105 0 98 1 0 1 1 0 8 0
mppekey 1024 116 0 116 8 8 0 1 0 8 0
ppxss 1160 470 0 470 41 40 1 1 0 8 1
pppxif 1360 296 0 296 32 32 0 1 0 8 0
pfstscr 40 353 0 346 1 0 1 1 0 8 0
pfosfp 40 5 0 4 1 0 1 1 0 8 0
pfosfpen 112 5 0 0 1 0 1 1 0 8 0
pfanchor 1280 512 327 0 43 0 43 43 0 8 0
pfqueue 264 4 0 4 2 2 0 1 0 8 0
pfstitem 24 172 0 158 1 0 1 1 0 8 0
pfstkey 128 621 0 465 6 0 6 6 0 8 0
pfstate 352 312 0 305 1 0 1 1 0 8 0
rttmr 136 28 0 28 8 8 0 1 0 8 0
art_heap8 4096 6 0 5 5 4 1 3 0 8 0
art_heap4 256 6445 0 6111 81 53 28 29 0 8 2
art_table 32 6451 0 6116 4 0 4 4 0 8 0
art_node 16 1474 0 1414 1 0 1 1 0 8 0
sysvmsgpl 40 5 0 2 1 0 1 1 0 8 0
semapl 112 2485 0 2464 1 0 1 1 0 8 0
shmpl 112 137 0 9 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 25253 0 23790 93 0 93 93 0 8 0
ffsino 240 25253 0 23790 88 1 87 87 0 8 0
nchpl 144 54590 0 52966 63 0 63 63 0 8 0
rtmask 32 6 0 6 3 3 0 1 0 8 0
uvmvnodes 80 6084 0 0 125 0 125 125 0 8 0
vnodes 216 6084 0 0 338 0 338 338 0 8 0
namei 1024 198568 0 198568 17 16 1 2 0 8 1
vmpool 664 88 0 88 16 16 0 1 0 8 0
kstatmem 264 796 0 772 17 15 2 3 0 8 0
scsiplug 72 12 0 12 5 5 0 1 0 8 0
scxspl 216 145249 0 145249 40 39 1 8 0 8 1
plimitpl 152 2019 0 2005 1 0 1 1 0 8 0
sigapl 424 18394 0 18334 10 2 8 8 0 8 0
futexpl 64 195819 0 195819 15 14 1 1 0 8 1
knotepl 120 198263 0 198189 104 101 3 11 0 8 0
kqueuepl 184 3660 0 3652 55 54 1 7 0 8 0
pipepl 288 3896 0 3871 68 65 3 7 0 8 0
fdescpl 432 18312 0 18291 4 0 4 4 0 8 0
filepl 120 156761 0 156547 193 183 10 17 0 8 2
lockfpl 104 4476 0 4474 8 7 1 2 0 8 0
lockfspl 48 1378 0 1376 1 0 1 1 0 8 0
sessionpl 144 123 0 108 1 0 1 1 0 8 0
pgrppl 48 1426 0 1411 1 0 1 1 0 8 0
ucredpl 104 18632 0 18622 1 0 1 1 0 8 0
zombiepl 144 18335 0 18334 6 5 1 1 0 8 0
processpl 1008 18394 0 18334 15 6 9 9 0 8 0
procpl 696 45363 0 45288 38 29 9 10 0 8 1
sosppl 168 159 0 158 27 26 1 1 0 8 0
sockpl 456 45101 0 45065 847 833 14 44 0 8 8
mcl64k 65536 533 0 533 49 48 1 1 0 8 1
mcl16k 16384 263 0 263 44 44 0 1 0 8 0
mcl12k 12288 537 0 537 41 40 1 1 0 8 1
mcl9k 9216 197 0 197 46 46 0 1 0 8 0
mcl8k 8192 883 0 883 45 44 1 1 0 8 1
mcl4k 4096 2222 0 2222 25 24 1 1 0 8 1
mcl2k2 2112 137 0 137 48 48 0 1 0 8 0
mcl2k 2048 110916 0 110841 47 36 11 25 0 8 0
mtagpl 96 2187 0 2096 22 15 7 10 0 8 0
mbufpl 256 372303 0 372020 1276 1242 34 208 0 8 0
bufpl 288 29559 0 23162 458 0 458 458 0 8 0
anonpl 24 3429950 0 3411912 231 107 124 141 0 188 0
amapchunkpl 152 333951 0 333295 128 95 33 43 0 158 0
amappl16 200 32847 0 32186 207 169 38 49 0 8 0
amappl15 192 127 0 125 1 0 1 1 0 8 0
amappl14 184 518 0 504 2 1 1 2 0 8 0
amappl13 176 9 0 8 1 0 1 1 0 8 0
amappl12 168 1576 0 1573 1 0 1 1 0 8 0
amappl11 160 50 0 39 1 0 1 1 0 8 0
amappl10 152 130 0 120 1 0 1 1 0 8 0
amappl9 144 994 0 993 1 0 1 1 0 8 0
amappl8 136 706 0 599 5 1 4 4 0 8 0
amappl7 128 357 0 333 2 0 2 2 0 8 0
amappl6 120 647 0 631 1 0 1 1 0 8 0
amappl5 112 713 0 707 1 0 1 1 0 8 0
amappl4 104 1821 0 1793 1 0 1 1 0 8 0
amappl3 96 50752 0 50714 2 0 2 2 0 8 0
amappl2 88 19707 0 19637 3 1 2 3 0 8 0
amappl1 80 405483 0 404875 36 20 16 22 0 8 0
amappl 88 113923 0 113766 5 0 5 5 0 92 0
dma4096 4096 1 0 1 1 1 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 6 0 6 1 1 0 1 0 8 0
dma128 128 253 0 253 1 1 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 7 0 7 1 1 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 139 0 9 3 0 3 3 0 8 0
uaddrrnd 24 18400 0 18379 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 18400 0 18379 1 0 1 1 0 8 0
vmmpekpl 168 129702 0 129641 3 0 3 3 0 8 0
vmmpepl 168 1692751 0 1690329 485 341 144 166 0 357 2
vmsppl 272 18399 0 18379 4 2 2 3 0 8 0
rwobjpl 24 421653 0 413732 60 10 50 51 0 8 0
pdppl 4096 36806 0 36758 1211 1147 64 68 0 8 16
pvpl 32 6848338 0 6825387 552 343 209 258 0 265 0
pmappl 216 18399 0 18379 2 0 2 2 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 3823 0 3027 28 3 25 28 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:437
panic(ffffffff82728421) at panic+0x161 sys/kern/subr_prf.c:198
__assert(ffffffff827a20ae,ffffffff827d17fa,12f,ffffffff827b21bf) at __assert+0x25 sys/kern/subr_prf.c:157
tun_clone_destroy(ffff800000e1a000) at tun_clone_destroy+0x234 sys/net/if_tun.c:303
if_clone_destroy(ffff80002e90c3c0) at if_clone_destroy+0x132 sys/net/if.c:1247
sys_ioctl(ffff8000fffec030,ffff80002e90c4d8,ffff80002e90c520) at sys_ioctl+0x49e
syscall(ffff80002e90c5a0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc6fc06cc190, count: -8
ddb> machine ddbcpu 1
No such command
ddb> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff82728421) at panic+0x161 sys/kern/subr_prf.c:198
__assert(ffffffff827a20ae,ffffffff827d17fa,12f,ffffffff827b21bf) at __assert+0x25 sys/kern/subr_prf.c:157
tun_clone_destroy(ffff800000e1a000) at tun_clone_destroy+0x234 sys/net/if_tun.c:303
if_clone_destroy(ffff80002e90c3c0) at if_clone_destroy+0x132 sys/net/if.c:1247
sys_ioctl(ffff8000fffec030,ffff80002e90c4d8,ffff80002e90c520) at sys_ioctl+0x49e
syscall(ffff80002e90c5a0) at syscall+0x4e6 sys/arch/amd64/amd64/trap.c:626
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xc6fc06cc190, count: -8