panic: kernel diagnostic assertpiaonic: 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
*253509 98922 0 0 0x4000000 1 syz-executor.1
304781 70836 0 0 0x4000000 0 syz-executor.0
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(ffffffff82204d9f,ffffffff821f02db,2b2,ffffffff821d43a9) 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(ffffffff82204d9f,ffffffff821f02db,2b2,ffffffff821d43a9) 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 0xffff800022bcb310
rbx 0xffff800022bcb3c0
rdx 0xffff800020ace020
rcx 0
rax 0
r8 0xffffffff817d4c1f kprintf+0x16f
r9 0x1
r10 0x25
r11 0x7ed9d7e8af4ebcb
r12 0x3000000008
r13 0xffff800022bcb320
r14 0x104
r15 0x1
rip 0xffffffff81a1d008 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022bcb300
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=253509 stat=onproc
flags process=0 proc=4000000<THREAD>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020acf3e0,0xffffffff82630770
process=0xffff800020add500 user=0xffff800022bc6000, vmspace=0xfffffd807f00b170
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
98922 243802 44447 0 2 0 syz-executor.1
98922 271495 44447 0 2 0x4000000 syz-executor.1
98922 383155 44447 0 3 0x4000080 fsleep syz-executor.1
*98922 253509 44447 0 7 0x4000000 syz-executor.1
70836 43688 38400 0 2 0 syz-executor.0
70836 304781 38400 0 7 0x4000000 syz-executor.0
38400 186451 57731 0 3 0x82 nanosleep syz-executor.0
44447 88358 57731 0 3 0x82 nanosleep syz-executor.1
80356 427884 0 0 3 0x14200 acct acct
6651 472549 1 0 3 0x100083 ttyin getty
14341 335469 0 0 3 0x14200 bored sosplice
57731 374558 72967 0 3 0x82 thrsleep syz-fuzzer
57731 180558 72967 0 3 0x4000082 nanosleep syz-fuzzer
57731 94361 72967 0 3 0x4000082 thrsleep syz-fuzzer
57731 134872 72967 0 3 0x4000082 thrsleep syz-fuzzer
57731 254567 72967 0 3 0x4000082 thrsleep syz-fuzzer
57731 198781 72967 0 3 0x4000082 thrsleep syz-fuzzer
57731 520794 72967 0 3 0x4000082 thrsleep syz-fuzzer
57731 90015 72967 0 3 0x4000082 thrsleep syz-fuzzer
57731 19959 72967 0 3 0x4000082 kqread syz-fuzzer
57731 165374 72967 0 3 0x4000082 thrsleep syz-fuzzer
72967 404078 93307 0 3 0x10008a pause ksh
93307 128998 13854 0 3 0x92 select sshd
13854 279942 1 0 3 0x80 select sshd
1060 52549 50075 74 3 0x100092 bpf pflogd
50075 420968 1 0 3 0x80 netio pflogd
4486 372472 99768 73 3 0x100090 kqread syslogd
99768 414726 1 0 3 0x100082 netio syslogd
40504 179300 1 77 3 0x100090 poll dhclient
18470 37347 1 0 3 0x80 poll dhclient
52861 2460 0 0 2 0x14200 zerothread
4308 214547 0 0 3 0x14200 aiodoned aiodoned
13767 55877 0 0 3 0x14200 syncer update
62547 229019 0 0 3 0x14200 cleaner cleaner
53989 294842 0 0 3 0x14200 reaper reaper
8081 177693 0 0 3 0x14200 pgdaemon pagedaemon
86012 27904 0 0 3 0x14200 bored crynlk
18451 183936 0 0 3 0x14200 bored crypto
10448 428109 0 0 3 0x40014200 acpi0 acpi0
19050 73627 0 0 3 0x40014200 idle1
34185 258425 0 0 3 0x14200 bored softnet
9889 368739 0 0 3 0x14200 bored systqmp
11639 174557 0 0 3 0x14200 bored systq
2997 244077 0 0 3 0x40014200 bored softclock
24423 41073 0 0 3 0x40014200 idle0
19414 450310 0 0 3 0x14200 bored smr
1 370101 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 70836 (syz-executor.0) thread 0xffff800020ace788 (304781)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8262bc68)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 rt_clone+0x5c sys/net/route.c:266
#2 rtalloc_mpath+0xba rt_match sys/net/route.c:244 [inline]
#2 rtalloc_mpath+0xba sys/net/route.c:359
#3 in_pcbselsrc+0x219 sys/netinet/in_pcb.c:934
#4 udp_output+0x5cf sys/netinet/udp_usrreq.c:937
#5 sosend+0x645 sys/kern/uipc_socket.c:524
#6 sendit+0x52b sys/kern/uipc_syscalls.c:662
#7 sys_sendto+0x80 sys/kern/uipc_syscalls.c:527
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:555
#9 Xsyscall+0x128
exclusive rwlock netlock r = 0 (0xffffffff824b0188)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1163
#1 solock+0x5a sys/kern/uipc_socket2.c:282
#2 sosend+0x51b sys/kern/uipc_socket.c:512
#3 sendit+0x52b sys/kern/uipc_syscalls.c:662
#4 sys_sendto+0x80 sys/kern/uipc_syscalls.c:527
#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
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim Kern Lim
devbuf 9591 6481K 7961K 78643K 16771 0 0
pcb 13 10K 12K 78643K 487 0 0
rtable 113 8K 9K 78643K 1484 0 0
ifaddr 87 18K 19K 78643K 423 0 0
counters 39 33K 33K 78643K 39 0 0
ioctlops 0 0K 4K 78643K 1571 0 0
iov 0 0K 32K 78643K 389 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1233 77K 78K 78643K 3457 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 27 0 0
VM map 20 10K 10K 78643K 29 0 0
sem 12 0K 1K 78643K 532 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1808 196K 290K 78643K 12765 0 0
file desc 6 17K 25K 78643K 2170 0 0
sigio 0 0K 0K 78643K 28 0 0
proc 62 63K 95K 78643K 1185 0 0
subproc 32 2K 2K 78643K 238 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 965 0 0
in_multi 35 2K 2K 78643K 262 0 0
ether_multi 1 0K 0K 78643K 23 0 0
mrt 0 0K 0K 78643K 8 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 596 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 138 169K 169K 78643K 8774 0 0
UVM aobj 123 8K 8K 78643K 126 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 0K 78643K 434 0 0
NDP 20 0K 0K 78643K 130 0 0
temp 228 3565K 4203K 78643K 73201 0 0
kqueue 0 0K 0K 78643K 28 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 56 0 50 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 150 0 148 1 0 1 1 0 8 0
rtentry 112 251 0 208 2 0 2 2 0 8 0
unpcb 120 994 0 979 2 1 1 2 0 8 0
syncache 264 16 0 16 8 7 1 1 0 8 1
sackhl 24 3 0 3 2 2 0 1 0 8 0
tcpqe 32 6593 0 6593 4 4 0 2 0 8 0
tcpcb 544 1733 0 1727 23 21 2 12 0 8 1
inpcb 280 3504 0 3494 21 18 3 9 0 8 2
rttmr 72 1 0 1 1 1 0 1 0 8 0
nd6 48 33 0 29 1 0 1 1 0 8 0
pkpcb 40 14 0 14 6 5 1 1 0 8 1
ppxss 1128 47 0 47 7 6 1 1 0 8 1
pffrag 232 42 0 42 7 6 1 1 0 482 1
pffrnode 88 42 0 42 7 6 1 1 0 8 1
pffrent 40 946 0 946 7 6 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 24 165 0 102 1 0 1 1 0 8 0
pfstkey 112 165 0 102 3 0 3 3 0 8 0
pfstate 328 165 0 102 7 0 7 7 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 2 0 1 2 1 1 2 0 8 0
art_heap4 256 1005 0 783 22 8 14 17 0 8 0
art_table 32 1007 0 784 3 1 2 3 0 8 0
art_node 16 246 0 207 1 0 1 1 0 8 0
sysvmsgpl 40 34 0 20 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 530 0 520 1 0 1 1 0 8 0
shmpl 112 124 0 3 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 4699 0 3293 46 0 46 46 0 8 0
ffsino 272 4699 0 3293 95 0 95 95 0 8 0
nchpl 144 9153 0 8690 61 41 20 61 0 8 0
uvmvnodes 72 5926 0 0 108 0 108 108 0 8 0
vnodes 208 5926 0 0 312 0 312 312 0 8 0
namei 1024 30469 0 30469 3 2 1 1 0 8 1
percpumem 16 30 0 0 1 0 1 1 0 8 0
vcpupl 1984 18 0 0 3 0 3 3 0 8 0
vmpool 552 27 0 9 5 3 2 2 0 8 0
scsiplug 64 3 0 3 2 1 1 1 0 8 1
scxspl 192 25814 0 25814 26 25 1 7 0 8 1
plimitpl 152 187 0 179 1 0 1 1 0 8 0
sigapl 432 2338 0 2322 3 1 2 3 0 8 0
futexpl 56 51663 0 51662 1 0 1 1 0 8 0
knotepl 112 623 0 604 1 0 1 1 0 8 0
kqueuepl 104 2671 0 2668 4 3 1 4 0 8 0
pipepl 112 2468 0 2447 12 11 1 2 0 8 0
fdescpl 488 2339 0 2322 3 0 3 3 0 8 0
filepl 152 24698 0 24586 32 26 6 13 0 8 1
lockfpl 104 687 0 686 1 0 1 1 0 8 0
lockfspl 48 248 0 247 1 0 1 1 0 8 0
sessionpl 112 34 0 23 1 0 1 1 0 8 0
pgrppl 48 60 0 49 1 0 1 1 0 8 0
ucredpl 96 2426 0 2417 1 0 1 1 0 8 0
zombiepl 144 2325 0 2325 3 2 1 1 0 8 1
processpl 896 2359 0 2325 4 0 4 4 0 8 0
procpl 632 7338 0 7291 5 0 5 5 0 8 0
srpgc 64 20 0 20 8 7 1 1 0 8 1
sosppl 128 35 0 35 6 6 0 1 0 8 0
sockpl 384 4683 0 4656 39 34 5 14 0 8 2
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 12 0 0 2 0 2 2 0 8 0
mcl12k 12288 25 0 0 2 0 2 2 0 8 0
mcl9k 9216 10 0 0 1 0 1 1 0 8 0
mcl8k 8192 18 0 0 3 0 3 3 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 8 0 0 1 0 1 1 0 8 0
mcl2k 2048 204 0 0 23 2 21 23 0 8 0
mtagpl 80 44 0 0 1 0 1 1 0 8 0
mbufpl 256 615 0 0 29 1 28 28 0 8 0
bufpl 256 12977 0 5929 441 0 441 441 0 8 0
anonpl 16 270128 0 252915 139 58 81 87 0 124 9
amapchunkpl 152 17037 0 16923 45 39 6 19 0 158 1
amappl16 192 12128 0 11125 120 67 53 63 0 8 2
amappl15 184 216 0 216 3 3 0 1 0 8 0
amappl14 176 552 0 548 2 1 1 1 0 8 0
amappl13 168 306 0 305 1 0 1 1 0 8 0
amappl12 160 64 0 62 2 1 1 1 0 8 0
amappl11 152 192 0 177 1 0 1 1 0 8 0
amappl10 144 121 0 117 1 0 1 1 0 8 0
amappl9 136 1621 0 1613 1 0 1 1 0 8 0
amappl8 128 1170 0 1134 2 0 2 2 0 8 0
amappl7 120 199 0 191 1 0 1 1 0 8 0
amappl6 112 177 0 164 1 0 1 1 0 8 0
amappl5 104 295 0 280 1 0 1 1 0 8 0
amappl4 96 2698 0 2661 2 1 1 2 0 8 0
amappl3 88 883 0 870 1 0 1 1 0 8 0
amappl2 80 17220 0 17139 3 1 2 3 0 8 0
amappl1 72 61980 0 61513 25 15 10 20 0 8 0
amappl 80 7824 0 7775 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 64 125 0 3 2 0 2 2 0 8 0
uaddrrnd 24 2366 0 2322 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2366 0 2322 1 0 1 1 0 8 0
vmmpekpl 168 25805 0 25768 3 0 3 3 0 8 0
vmmpepl 168 302336 0 300034 254 120 134 140 0 357 31
vmsppl 368 2338 0 2322 2 0 2 2 0 8 0
pdppl 4096 4739 0 4680 10 2 8 8 0 8 0
pvpl 32 752786 0 732259 285 87 198 205 0 265 23
pmappl 232 2365 0 2331 5 2 3 3 0 8 1
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 668 0 40 19 0 19 19 0 8 0