panic: kernel diagnostic assertion "rt->rt_ifa->ifa_ifp != NULL" failed: fipanic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 690
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
442114 90099 0 0 0x4000000 0 syz-executor.1
*326856 90099 0 0 0x4000000 1 syz-executor.1
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(ffffffff8220729b,ffffffff821f4238,2b2,ffffffff821d8259) at __assert+0x2b sys/kern/subr_prf.c:154
proc_trampoline_mp() at proc_trampoline_mp+0x123
end trace frame: 0x0, count: 11
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 "rt->rt_ifa->ifa_ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/net/route.c", line 848
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(ffffffff8220729b,ffffffff821f4238,2b2,ffffffff821d8259) at __assert+0x2b sys/kern/subr_prf.c:154
proc_trampoline_mp() at proc_trampoline_mp+0x123
end trace frame: 0x0, count: -4
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800023bcd7b0
rbx 0xffff800023bcd860
rdx 0xffff800020ab18c8
rcx 0
rax 0
r8 0xffffffff8182804f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xb9289ddc2b36de7d
r12 0x3000000008
r13 0xffff800023bcd7c0
r14 0x104
r15 0x1
rip 0xffffffff81d20338 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800023bcd7a0
ss 0
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=326856 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020ab0ee8,0xffff800020ab0790
process=0xffff800020add500 user=0xffff800023bc8000, vmspace=0xfffffd807f00b2e0
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
90099 321008 442 0 2 0 syz-executor.1
90099 442114 442 0 7 0x4000000 syz-executor.1
*90099 326856 442 0 7 0x4000000 syz-executor.1
90099 70755 442 0 2 0x4000000 syz-executor.1
46277 86815 41659 0 3 0x3010 suspend syz-executor.0
46277 32118 41659 0 2 0x4081090 syz-executor.0
46277 321617 41659 0 2 0x4081090 syz-executor.0
442 498393 16356 0 3 0x82 nanosleep syz-executor.1
41659 431607 16356 0 3 0x82 nanosleep syz-executor.0
32050 161374 0 0 3 0x14200 bored sosplice
16356 291427 77447 0 3 0x82 thrsleep syz-fuzzer
16356 287170 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 374346 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 143685 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 305043 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 453509 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 79087 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 250507 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 6295 77447 0 3 0x4000082 thrsleep syz-fuzzer
16356 406951 77447 0 3 0x4000082 kqread syz-fuzzer
77447 63646 51525 0 3 0x10008a pause ksh
51525 137356 28257 0 3 0x92 select sshd
77712 489257 1 0 3 0x100083 ttyin getty
28257 361317 1 0 3 0x80 select sshd
50902 523985 33331 74 3 0x100092 bpf pflogd
33331 5960 1 0 3 0x80 netio pflogd
96050 268007 91163 73 3 0x100090 kqread syslogd
91163 78751 1 0 3 0x100082 netio syslogd
12863 63273 1 77 3 0x100090 poll dhclient
13279 68047 1 0 3 0x80 poll dhclient
66828 184439 0 0 2 0x14200 zerothread
9340 134994 0 0 3 0x14200 aiodoned aiodoned
9690 480222 0 0 3 0x14200 syncer update
46190 157475 0 0 3 0x14200 cleaner cleaner
37161 306500 0 0 3 0x14200 reaper reaper
32026 211047 0 0 3 0x14200 pgdaemon pagedaemon
40128 390057 0 0 3 0x14200 bored crynlk
36502 131827 0 0 3 0x14200 bored crypto
5939 92576 0 0 3 0x40014200 acpi0 acpi0
53384 382280 0 0 3 0x40014200 idle1
59955 101564 0 0 3 0x14200 bored softnet
32901 301274 0 0 3 0x14200 bored systqmp
57256 284790 0 0 3 0x14200 bored systq
96438 493569 0 0 3 0x40014200 bored softclock
34357 223085 0 0 3 0x40014200 idle0
86723 95888 0 0 3 0x14200 bored smr
1 269236 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 90099 (syz-executor.1) thread 0xffff800020ab0ee8 (442114)
exclusive rwlock netlock r = 0 (0xffffffff82505ce8)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 solock+0x5a sys/kern/uipc_socket2.c:282
#2 sys_connect+0x6b sys/kern/uipc_syscalls.c:362
#3 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#3 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#4 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff8262ed78)
#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 9585 6451K 7354K 78643K 14202 0 0
pcb 13 8K 8K 78643K 330 0 0
rtable 98 8K 8K 78643K 884 0 0
ifaddr 79 16K 17K 78643K 305 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1549 0 0
iov 0 0K 16K 78643K 200 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1221 77K 77K 78643K 2466 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 19 0 0
VM map 5 2K 3K 78643K 11 0 0
sem 12 1K 1K 78643K 47 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 6 17K 25K 78643K 1165 0 0
sigio 1 0K 0K 78643K 18 0 0
proc 61 63K 83K 78643K 775 0 0
subproc 32 2K 2K 78643K 136 0 0
NFS srvsock 1 0K 0K 78643K 1 0 0
NFS daemon 1 16K 16K 78643K 1 0 0
ip_moptions 0 0K 0K 78643K 204 0 0
in_multi 23 1K 2K 78643K 194 0 0
ether_multi 1 0K 0K 78643K 19 0 0
mrt 1 0K 0K 78643K 12 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 78 344K 344K 78643K 78 0 0
exec 0 0K 1K 78643K 415 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 128 55K 59K 78643K 5131 0 0
UVM aobj 80 4K 4K 78643K 84 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 311 0 0
NDP 19 0K 0K 78643K 91 0 0
temp 220 3556K 3628K 78643K 55755 0 0
kqueue 0 0K 0K 78643K 15 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 27 0 22 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 112 0 110 1 0 1 1 0 8 0
rtentry 112 145 0 109 2 0 2 2 0 8 0
unpcb 120 1254 0 1242 2 1 1 2 0 8 0
syncache 264 10 0 10 3 3 0 1 0 8 0
tcpqe 32 6030 0 6030 3 3 0 1 0 8 0
tcpcb 544 471 0 465 1 0 1 1 0 8 0
inpcb 280 2537 0 2527 5 3 2 3 0 8 1
rttmr 72 3 0 3 2 2 0 1 0 8 0
nd6 48 21 0 19 2 1 1 1 0 8 0
pkpcb 40 2 0 2 1 1 0 1 0 8 0
ppxss 1128 39 0 39 3 2 1 1 0 8 1
pffrag 232 27 0 27 5 4 1 1 0 482 1
pffrnode 88 27 0 27 5 4 1 1 0 8 1
pffrent 40 614 0 614 5 4 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 24 128 0 59 1 0 1 1 0 8 0
pfstkey 112 128 0 59 2 0 2 2 0 8 0
pfstate 328 128 0 59 6 0 6 6 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 4 0 3 3 2 1 3 0 8 0
art_heap4 256 692 0 514 21 7 14 14 0 8 2
art_table 32 696 0 517 2 0 2 2 0 8 0
art_node 16 144 0 111 1 0 1 1 0 8 0
sysvmsgpl 40 98 0 59 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 45 0 35 1 0 1 1 0 8 0
shmpl 112 82 0 4 3 0 3 3 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 3183 0 1778 46 0 46 46 0 8 0
ffsino 272 3183 0 1778 97 2 95 95 0 8 0
nchpl 144 5125 0 3512 61 0 61 61 0 8 0
uvmvnodes 72 4170 0 0 76 0 76 76 0 8 0
vnodes 208 4170 0 0 220 0 220 220 0 8 0
namei 1024 16770 0 16770 3 2 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
vcpupl 1984 3 0 0 1 0 1 1 0 8 0
vmpool 552 9 0 6 1 0 1 1 0 8 0
scsiplug 64 2 0 2 1 1 0 1 0 8 0
scxspl 192 16590 0 16590 18 14 4 7 0 8 4
plimitpl 152 100 0 92 1 0 1 1 0 8 0
sigapl 432 1347 0 1331 3 1 2 3 0 8 0
futexpl 56 29989 0 29987 1 0 1 1 0 8 0
knotepl 112 279 0 260 1 0 1 1 0 8 0
kqueuepl 104 207 0 205 1 0 1 1 0 8 0
pipepl 112 848 0 829 4 2 2 2 0 8 1
fdescpl 488 1348 0 1331 3 0 3 3 0 8 0
filepl 152 12073 0 11970 12 6 6 7 0 8 1
lockfpl 104 453 0 452 1 0 1 1 0 8 0
lockfspl 48 150 0 149 1 0 1 1 0 8 0
sessionpl 112 24 0 13 1 0 1 1 0 8 0
pgrppl 48 35 0 24 1 0 1 1 0 8 0
ucredpl 96 1500 0 1489 1 0 1 1 0 8 0
zombiepl 144 1332 0 1332 3 2 1 1 0 8 1
processpl 896 1365 0 1332 4 0 4 4 0 8 0
procpl 632 4042 0 3995 5 0 5 5 0 8 1
srpgc 64 8 0 8 4 3 1 1 0 8 1
sosppl 128 57 0 57 4 3 1 1 0 8 1
sockpl 384 3920 0 3896 16 10 6 8 0 8 3
mcl64k 65536 261 0 0 33 6 27 33 0 8 1
mcl16k 16384 8 0 0 1 0 1 1 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 13 0 0 1 0 1 1 0 8 0
mcl8k 8192 15 0 0 2 0 2 2 0 8 0
mcl4k 4096 14 0 0 2 0 2 2 0 8 0
mcl2k2 2112 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 178 0 0 20 2 18 20 0 8 0
mtagpl 80 31 0 0 1 0 1 1 0 8 0
mbufpl 256 596 0 0 32 1 31 31 0 8 0
bufpl 256 10335 0 3287 441 0 441 441 0 8 0
anonpl 16 160178 0 143100 105 25 80 87 0 124 6
amapchunkpl 152 9652 0 9521 28 18 10 19 0 158 4
amappl16 192 6750 0 5711 89 35 54 65 0 8 2
amappl15 184 89 0 88 1 0 1 1 0 8 0
amappl14 176 181 0 175 2 1 1 1 0 8 0
amappl13 168 134 0 134 1 1 0 1 0 8 0
amappl12 160 116 0 112 1 0 1 1 0 8 0
amappl11 152 70 0 55 1 0 1 1 0 8 0
amappl10 144 520 0 510 1 0 1 1 0 8 0
amappl9 136 777 0 770 1 0 1 1 0 8 0
amappl8 128 317 0 283 2 0 2 2 0 8 0
amappl7 120 555 0 545 1 0 1 1 0 8 0
amappl6 112 85 0 75 1 0 1 1 0 8 0
amappl5 104 301 0 286 1 0 1 1 0 8 0
amappl4 96 1752 0 1718 1 0 1 1 0 8 0
amappl3 88 172 0 166 1 0 1 1 0 8 0
amappl2 80 9577 0 9497 4 2 2 3 0 8 0
amappl1 72 40396 0 39940 26 16 10 20 0 8 0
amappl 80 4402 0 4358 3 1 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 83 0 4 2 0 2 2 0 8 0
uaddrrnd 24 1357 0 1331 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1357 0 1331 1 0 1 1 0 8 0
vmmpekpl 168 15271 0 15238 2 0 2 2 0 8 0
vmmpepl 168 177154 0 174846 213 77 136 136 0 357 35
vmsppl 368 1347 0 1331 2 0 2 2 0 8 0
pdppl 4096 2721 0 2677 7 1 6 6 0 8 0
pvpl 32 454917 0 434523 268 67 201 207 0 265 32
pmappl 232 1356 0 1337 3 1 2 2 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 672 0 26 19 0 19 19 0 8 0