panic: kernel diagnostic assertion "ifa == rt->rt_ifa" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet6/nd6.c", line 947
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*229022 7799 0 0 0x4000000 1K syz-executor.0
36435 85139 0 0x14000 0x200 0 reaper
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff822092b2,ffffffff82200f5e,3b3,ffffffff821c2a59) at __assert+0x2b sys/kern/subr_prf.c:154
nd6_rtrequest(ffff800000a99000,1,fffffd8065ac0858) at nd6_rtrequest+0xbb4 sys/netinet6/nd6.c:947
rtrequest(1,ffff8000229c9008,1,ffff8000229c90d8,0) at rtrequest+0x9bf sys/net/route.c:973
rt_ifa_add(ffff800000b22800,240404,ffff800000b22858,0) at rt_ifa_add+0x290 sys/net/route.c:1133
rt_ifa_addlocal(ffff800000b22800) at rt_ifa_addlocal+0x16d sys/net/route.c:1242
in_ifinit(ffff800000a99000,ffff800000b22800,ffff8000229c9400,0) at in_ifinit+0x1cf sys/netinet/in.c:645
in_ioctl_sifaddr(8020690c,ffff8000229c93f0,ffff800000a99000,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:372
in_ioctl(8020690c,ffff8000229c93f0,ffff800000a99000,1) at in_ioctl+0x1e7 sys/netinet/in.c:243
ifioctl(fffffd806f6d7900,8020690c,ffff8000229c93f0,ffff800020ab0c70) at ifioctl+0xb64 sys/net/if.c:2202
sys_ioctl(ffff800020ab0c70,ffff8000229c9508,ffff8000229c9550) at sys_ioctl+0x5b9
syscall(ffff8000229c95d0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
syscall(ffff8000229c95d0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,ffffffffffffff36,0,3,1788b883010) at Xsyscall+0x128
end of kernel
end trace frame: 0x17afc188720, count: 1
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 "ifa == rt->rt_ifa" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet6/nd6.c", line 947
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic() at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff822092b2,ffffffff82200f5e,3b3,ffffffff821c2a59) at __assert+0x2b sys/kern/subr_prf.c:154
nd6_rtrequest(ffff800000a99000,1,fffffd8065ac0858) at nd6_rtrequest+0xbb4 sys/netinet6/nd6.c:947
rtrequest(1,ffff8000229c9008,1,ffff8000229c90d8,0) at rtrequest+0x9bf sys/net/route.c:973
rt_ifa_add(ffff800000b22800,240404,ffff800000b22858,0) at rt_ifa_add+0x290 sys/net/route.c:1133
rt_ifa_addlocal(ffff800000b22800) at rt_ifa_addlocal+0x16d sys/net/route.c:1242
in_ifinit(ffff800000a99000,ffff800000b22800,ffff8000229c9400,0) at in_ifinit+0x1cf sys/netinet/in.c:645
in_ioctl_sifaddr(8020690c,ffff8000229c93f0,ffff800000a99000,1) at in_ioctl_sifaddr+0x208 sys/netinet/in.c:372
in_ioctl(8020690c,ffff8000229c93f0,ffff800000a99000,1) at in_ioctl+0x1e7 sys/netinet/in.c:243
ifioctl(fffffd806f6d7900,8020690c,ffff8000229c93f0,ffff800020ab0c70) at ifioctl+0xb64 sys/net/if.c:2202
sys_ioctl(ffff800020ab0c70,ffff8000229c9508,ffff8000229c9550) at sys_ioctl+0x5b9
syscall(ffff8000229c95d0) at syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
syscall(ffff8000229c95d0) at syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
Xsyscall(6,0,ffffffffffffff36,0,3,1788b883010) at Xsyscall+0x128
end of kernel
end trace frame: 0x17afc188720, count: -14
ddb{1}> show registers
rdi 0xffffffff815a92f7 db_enter+0x17
rsi 0x81fa __ALIGN_SIZE+0x71fa
rbp 0xffff8000229c8d40
rbx 0xffff8000229c8df0
rdx 0x81fb __ALIGN_SIZE+0x71fb
rcx 0xffff80002138a000
rax 0xffff80002138a000
r8 0xffffffff821269af kprintf+0x16f
r9 0x1
r10 0x25
r11 0x59494f641d4387a2
r12 0x3000000008
r13 0xffff8000229c8d50
r14 0x100
r15 0x1
rip 0xffffffff815a92f8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000229c8d30
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.0) pid=229022 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020ab0ee8,0xffffffff8266aad8
process=0xffff800020adc700 user=0xffff8000229c4000, vmspace=0xfffffd807f00ab80
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7799 405975 76196 0 2 0 syz-executor.0
* 7799 229022 76196 0 7 0x4000000 syz-executor.0
65093 498913 62709 0 3 0x82 nanosleep syz-executor.1
83078 429139 1 0 3 0x100083 ttyin getty
76196 405271 62709 0 3 0x82 nanosleep syz-executor.0
1934 472103 0 0 3 0x14200 bored sosplice
62709 239824 28387 0 3 0x82 thrsleep syz-fuzzer
62709 217588 28387 0 3 0x4000082 nanosleep syz-fuzzer
62709 318607 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 161796 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 248994 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 338971 28387 0 3 0x4000082 kqread syz-fuzzer
62709 426010 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 270209 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 318199 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 479537 28387 0 3 0x4000082 thrsleep syz-fuzzer
62709 25921 28387 0 3 0x4000082 thrsleep syz-fuzzer
28387 13502 29690 0 3 0x10008a pause ksh
29690 242982 68745 0 3 0x92 select sshd
68745 502258 1 0 3 0x80 select sshd
31433 13204 52310 74 3 0x100092 bpf pflogd
52310 116850 1 0 3 0x80 netio pflogd
21292 48742 34082 73 3 0x100090 kqread syslogd
34082 232165 1 0 3 0x100082 netio syslogd
23057 41284 1 77 3 0x100090 poll dhclient
8646 154753 1 0 3 0x80 poll dhclient
53250 297810 0 0 2 0x14200 zerothread
32193 73837 0 0 3 0x14200 aiodoned aiodoned
38121 380415 0 0 3 0x14200 syncer update
75302 67029 0 0 3 0x14200 cleaner cleaner
85139 36435 0 0 7 0x14200 reaper
13544 305778 0 0 3 0x14200 pgdaemon pagedaemon
35878 30031 0 0 3 0x14200 bored crynlk
29946 345252 0 0 3 0x14200 bored crypto
30053 361552 0 0 3 0x40014200 acpi0 acpi0
73581 224721 0 0 3 0x40014200 idle1
61399 407546 0 0 3 0x14200 bored softnet
32744 490502 0 0 2 0x14200 systqmp
94383 165660 0 0 3 0x14200 bored systq
35038 9532 0 0 3 0x40014200 bored softclock
68561 290592 0 0 3 0x40014200 idle0
24055 327596 0 0 3 0x14200 bored smr
1 384179 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 7799 (syz-executor.0) thread 0xffff800020ab0c70 (229022)
exclusive rwlock netlock r = 0 (0xffffffff824895c8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 in_ioctl_sifaddr+0x69
#2 in_ioctl+0x1e7 sys/netinet/in.c:243
#3 ifioctl+0xb64 sys/net/if.c:2202
#4 sys_ioctl+0x5b9
#5 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#5 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#6 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82663580)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:83 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:555
#2 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9595 7327K 7846K 78643K 14308 0 0
pcb 13 8K 8K 78643K 378 0 0
rtable 101 4K 4K 78643K 1231 0 0
ifaddr 80 17K 18K 78643K 404 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1564 0 0
iov 0 0K 32K 78643K 367 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1220 77K 77K 78643K 3115 0 0
UFS quota 1 32K 32K 78643K 1 0 0
UFS mount 5 36K 36K 78643K 5 0 0
shm 2 1K 5K 78643K 23 0 0
VM map 26 13K 13K 78643K 28 0 0
sem 12 0K 0K 78643K 449 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 5 13K 25K 78643K 1495 0 0
sigio 0 0K 0K 78643K 8 0 0
proc 61 63K 95K 78643K 966 0 0
subproc 32 2K 2K 78643K 187 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 1K 78643K 158 0 0
in_multi 31 2K 2K 78643K 224 0 0
ether_multi 1 0K 0K 78643K 18 0 0
mrt 0 0K 0K 78643K 10 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 120 530K 530K 78643K 120 0 0
exec 0 0K 1K 78643K 488 0 0
pagedep 1 8K 8K 78643K 1 0 0
inodedep 1 32K 32K 78643K 1 0 0
newblk 1 0K 0K 78643K 1 0 0
VM swap 7 26K 26K 78643K 7 0 0
UVM amap 170 211K 215K 78643K 6524 0 0
UVM aobj 130 9K 9K 78643K 136 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 1K 78643K 345 0 0
NDP 19 0K 0K 78643K 124 0 0
temp 214 3564K 4200K 78643K 65873 0 0
kqueue 0 0K 0K 78643K 23 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 32 0 28 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 193 0 191 1 0 1 1 0 8 0
rtentry 112 200 0 161 2 0 2 2 0 8 0
unpcb 120 877 0 865 4 3 1 2 0 8 0
syncache 264 13 0 13 5 5 0 1 0 8 0
tcpqe 32 65 0 65 4 4 0 1 0 8 0
tcpcb 544 680 0 676 5 4 1 2 0 8 0
inpcb 280 3114 0 3106 6 4 2 3 0 8 0
rttmr 72 3 0 2 3 2 1 1 0 8 0
nd6 48 30 0 25 1 0 1 1 0 8 0
pkpcb 40 8 0 8 5 4 1 1 0 8 1
ppxss 1128 55 0 55 7 6 1 1 0 8 1
pffrag 232 31 0 31 8 7 1 1 0 482 1
pffrnode 88 31 0 31 8 7 1 1 0 8 1
pffrent 40 655 0 655 8 7 1 1 0 8 1
pfosfp 40 846 0 423 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfstitem 24 122 0 76 1 0 1 1 0 8 0
pfstkey 112 122 0 76 2 0 2 2 0 8 0
pfstate 328 122 0 76 5 0 5 5 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 256 901 0 650 21 3 18 18 0 8 1
art_table 32 902 0 650 3 0 3 3 0 8 0
art_node 16 199 0 161 1 0 1 1 0 8 0
sysvmsgpl 40 6 0 5 2 1 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 447 0 437 1 0 1 1 0 8 0
shmpl 112 134 0 6 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 4372 0 2960 46 0 46 46 0 8 0
ffsino 272 4372 0 2960 95 0 95 95 0 8 0
nchpl 144 6887 0 5290 61 0 61 61 0 8 0
uvmvnodes 72 5421 0 0 99 0 99 99 0 8 0
vnodes 208 5421 0 0 286 0 286 286 0 8 0
namei 1024 28095 0 28095 1 0 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
vcpupl 1984 24 0 0 3 0 3 3 0 8 0
vmpool 552 26 0 2 2 0 2 2 0 8 0
scsiplug 64 1 0 1 1 1 0 1 0 8 0
scxspl 192 20034 0 20034 16 15 1 5 0 8 1
plimitpl 152 155 0 147 1 0 1 1 0 8 0
sigapl 432 1667 0 1652 3 1 2 3 0 8 0
futexpl 56 39626 0 39626 1 0 1 1 0 8 1
knotepl 112 383 0 364 3 2 1 2 0 8 0
kqueuepl 104 442 0 440 1 0 1 1 0 8 0
pipepl 112 1102 0 1083 4 3 1 2 0 8 0
fdescpl 488 1668 0 1652 3 0 3 3 0 8 0
filepl 152 19303 0 19202 13 7 6 8 0 8 2
lockfpl 104 779 0 778 1 0 1 1 0 8 0
lockfspl 48 238 0 237 1 0 1 1 0 8 0
sessionpl 112 28 0 17 1 0 1 1 0 8 0
pgrppl 48 50 0 39 1 0 1 1 0 8 0
ucredpl 96 5601 0 5592 1 0 1 1 0 8 0
zombiepl 144 1652 0 1651 1 0 1 1 0 8 0
processpl 896 1684 0 1651 4 0 4 4 0 8 0
procpl 632 5221 0 5177 5 0 5 5 0 8 1
srpgc 64 15 0 15 7 7 0 1 0 8 0
sosppl 128 30 0 30 5 4 1 1 0 8 1
sockpl 384 4247 0 4225 20 16 4 8 0 8 1
mcl64k 65536 22 0 0 3 0 3 3 0 8 0
mcl16k 16384 9 0 0 2 0 2 2 0 8 0
mcl12k 12288 16 0 0 2 0 2 2 0 8 0
mcl9k 9216 17 0 0 2 0 2 2 0 8 0
mcl8k 8192 18 0 0 3 1 2 3 0 8 0
mcl4k 4096 15 0 0 2 0 2 2 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 184 0 0 22 0 22 22 0 8 0
mtagpl 80 38 0 0 1 0 1 1 0 8 0
mbufpl 256 468 0 0 29 0 29 29 0 8 0
bufpl 256 10328 0 3270 442 0 442 442 0 8 0
anonpl 16 234494 0 213533 134 41 93 100 0 124 6
amapchunkpl 152 12575 0 12401 34 26 8 14 0 158 0
amappl16 192 9744 0 8585 118 51 67 80 0 8 8
amappl15 184 62 0 62 2 2 0 1 0 8 0
amappl14 176 210 0 201 1 0 1 1 0 8 0
amappl13 168 489 0 486 1 0 1 1 0 8 0
amappl12 160 162 0 162 3 3 0 1 0 8 0
amappl11 152 249 0 234 1 0 1 1 0 8 0
amappl10 144 369 0 362 1 0 1 1 0 8 0
amappl9 136 766 0 759 1 0 1 1 0 8 0
amappl8 128 344 0 297 2 0 2 2 0 8 0
amappl7 120 429 0 422 1 0 1 1 0 8 0
amappl6 112 236 0 226 1 0 1 1 0 8 0
amappl5 104 377 0 363 1 0 1 1 0 8 0
amappl4 96 2365 0 2324 3 1 2 2 0 8 0
amappl3 88 176 0 169 1 0 1 1 0 8 0
amappl2 80 12052 0 11970 3 1 2 3 0 8 0
amappl1 72 47653 0 47197 25 15 10 20 0 8 0
amappl 80 5670 0 5605 2 0 2 2 0 84 0
dma4096 4096 1 0 1 1 1 0 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 17 0 17 1 1 0 1 0 8 0
aobjpl 64 135 0 6 3 0 3 3 0 8 0
uaddrrnd 24 1694 0 1652 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1694 0 1652 1 0 1 1 0 8 0
vmmpekpl 168 18447 0 18411 3 0 3 3 0 8 0
vmmpepl 168 222680 0 220205 227 79 148 152 0 357 36
vmsppl 368 1667 0 1651 2 0 2 2 0 8 0
pdppl 4096 3395 0 3330 10 1 9 9 0 8 0
pvpl 32 632281 0 608913 293 73 220 231 0 265 27
pmappl 232 1693 0 1653 4 1 3 3 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 645 0 12 19 0 19 19 0 8 0