panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/netinet/if_ether.c", line 716
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*341048 7324 0 0x14000 0x40000200 0 softclock
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(ffffffff821e3913,ffffffff821ff6e1,2cc,ffffffff8216ac2c) at __assert+0x2b sys/kern/subr_prf.c:154
arptfree(fffffd802e3cd698) at arptfree+0xfb sys/netinet/if_ether.c:716
arptimer(ffffffff82556fa8) at arptimer+0x95 sys/netinet/if_ether.c:120
softclock_thread(ffff8000ffffe000) at softclock_thread+0x145 timeout_run sys/kern/kern_timeout.c:475 [inline]
softclock_thread(ffff8000ffffe000) at softclock_thread+0x145 sys/kern/kern_timeout.c:552
end trace frame: 0x0, count: 9
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
kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/main/kernel/sys/netinet/if_ether.c", line 716
ddb> 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(ffffffff821e3913,ffffffff821ff6e1,2cc,ffffffff8216ac2c) at __assert+0x2b sys/kern/subr_prf.c:154
arptfree(fffffd802e3cd698) at arptfree+0xfb sys/netinet/if_ether.c:716
arptimer(ffffffff82556fa8) at arptimer+0x95 sys/netinet/if_ether.c:120
softclock_thread(ffff8000ffffe000) at softclock_thread+0x145 timeout_run sys/kern/kern_timeout.c:475 [inline]
softclock_thread(ffff8000ffffe000) at softclock_thread+0x145 sys/kern/kern_timeout.c:552
end trace frame: 0x0, count: -6
ddb> show registers
rdi 0
rsi 0x1
rbp 0xffff800014812140
rbx 0xffff8000148121f0
rdx 0x2
rcx 0
rax 0
r8 0xffff800014812100
r9 0x1
r10 0
r11 0xa5c389674329778e
r12 0x3000000008
r13 0xffff800014812150
r14 0x100
r15 0x1
rip 0xffffffff818bd9d8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800014812130
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb> show proc
PROC (softclock) pid=341048 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=40000200<SYSTEM,CPUPEG>
pri=0, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffffe768,0xffff8000ffffe288
process=0xffff8000ffffc000 user=0xffff80001480d000, vmspace=0xffffffff82559af0
estcpu=0, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
80688 184334 54873 0 2 0 syz-executor.0
80688 135296 54873 0 2 0x4000000 syz-executor.0
54873 341029 29446 0 2 0x482 syz-executor.0
59661 307951 29446 0 2 0x482 syz-executor.1
46417 432091 0 0 3 0x14200 acct acct
57776 145055 0 0 3 0x14200 bored sosplice
29446 270324 37192 0 3 0x82 thrsleep syz-fuzzer
29446 76322 37192 0 2 0x4000482 syz-fuzzer
29446 431233 37192 0 3 0x4000082 kqread syz-fuzzer
29446 11696 37192 0 3 0x4000082 thrsleep syz-fuzzer
29446 107080 37192 0 3 0x4000082 thrsleep syz-fuzzer
29446 73006 37192 0 3 0x4000082 thrsleep syz-fuzzer
29446 386383 37192 0 3 0x4000082 thrsleep syz-fuzzer
29446 23719 37192 0 3 0x4000082 thrsleep syz-fuzzer
37192 313848 18634 0 3 0x10008a pause ksh
18634 6982 15504 0 3 0x92 select sshd
80473 249512 1 0 3 0x100083 ttyin getty
15504 220307 1 0 3 0x80 select sshd
7117 49278 67336 73 3 0x100090 kqread syslogd
67336 73860 1 0 3 0x100082 netio syslogd
20893 396967 1 77 3 0x100090 poll dhclient
19171 142566 1 0 3 0x80 poll dhclient
86115 114455 0 0 2 0x14200 zerothread
61354 69940 0 0 3 0x14200 aiodoned aiodoned
98453 76624 0 0 3 0x14200 syncer update
6523 481917 0 0 3 0x14200 cleaner cleaner
30298 156288 0 0 3 0x14200 reaper reaper
80900 87200 0 0 3 0x14200 pgdaemon pagedaemon
19497 29919 0 0 3 0x14200 bored crynlk
72995 353614 0 0 3 0x14200 bored crypto
6814 466560 0 0 3 0x40014200 acpi0 acpi0
76066 322657 0 0 3 0x14200 bored softnet
88204 215792 0 0 3 0x14200 bored systqmp
53141 19318 0 0 3 0x14200 bored systq
* 7324 341048 0 0 7 0x40014200 softclock
69628 483835 0 0 3 0x40014200 idle0
62820 208807 0 0 3 0x14200 bored smr
1 1729 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 Kern Lim
devbuf 9573 6996K 7755K 78643K 13472 0 0
pcb 13 8K 9K 78643K 282 0 0
rtable 104 5K 5K 78643K 1172 0 0
ifaddr 74 16K 17K 78643K 314 0 0
counters 19 16K 16K 78643K 19 0 0
ioctlops 0 0K 2K 78643K 116 0 0
iov 0 0K 24K 78643K 5820 0 0
mount 1 1K 1K 78643K 1 0 0
vnodes 1219 77K 77K 78643K 2520 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 29 0 0
VM map 10 2K 2K 78643K 18 0 0
sem 12 0K 1K 78643K 11529 0 0
dirhash 12 2K 2K 78643K 12 0 0
ACPI 1793 195K 288K 78643K 12645 0 0
file desc 5 13K 25K 78643K 4946 0 0
sigio 0 0K 0K 78643K 28 0 0
proc 49 38K 63K 78643K 931 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 161 0 0
in_multi 24 1K 2K 78643K 222 0 0
ether_multi 1 0K 0K 78643K 14 0 0
mrt 0 0K 0K 78643K 20 0 0
ISOFS mount 1 32K 32K 78643K 1 0 0
MSDOSFS mount 1 16K 16K 78643K 1 0 0
ttys 150 662K 662K 78643K 150 0 0
exec 0 0K 1K 78643K 526 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 103 86K 90K 78643K 11760 0 0
UVM aobj 130 4K 4K 78643K 132 0 0
memdesc 1 4K 4K 78643K 1 0 0
crypto data 1 1K 1K 78643K 1 0 0
ip6_options 0 0K 3K 78643K 902 0 0
NDP 17 0K 0K 78643K 103 0 0
temp 205 3544K 4180K 78643K 75786 0 0
kqueue 0 0K 0K 78643K 11 0 0
SYN cache 2 16K 16K 78643K 2 0 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 35 0 29 1 0 1 1 0 8 0
rtpcb 80 183 0 181 1 0 1 1 0 8 0
rtentry 112 223 0 184 2 0 2 2 0 8 0
unpcb 120 28288 0 28280 3 2 1 2 0 8 0
syncache 264 11 0 11 4 4 0 1 0 8 0
tcpqe 32 94 0 94 2 2 0 1 0 8 0
tcpcb 544 18152 0 18148 10 8 2 3 0 8 1
ipq 40 19 0 19 8 8 0 1 0 8 0
ipqe 40 434 0 434 8 8 0 1 0 8 0
inpcb 280 19136 0 19129 8 4 4 4 0 8 3
rttmr 72 9 0 9 4 4 0 1 0 8 0
ip6q 72 2 0 2 1 1 0 1 0 8 0
ip6af 40 6 0 6 1 1 0 1 0 8 0
nd6 48 31 0 29 1 0 1 1 0 8 0
pkpcb 40 16 0 16 5 5 0 1 0 8 0
swfcl 56 1 0 0 1 0 1 1 0 8 0
ppxss 1128 26 0 26 8 8 0 1 0 8 0
art_heap8 4096 8 0 7 6 5 1 3 0 8 0
art_heap4 256 999 0 814 19 5 14 15 0 8 0
art_table 32 1007 0 821 2 0 2 2 0 8 0
art_node 16 222 0 187 1 0 1 1 0 8 0
sysvmsgpl 40 80 0 60 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 11527 0 11517 1 0 1 1 0 8 0
shmpl 112 130 0 2 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 7265 0 5873 46 0 46 46 0 8 0
ffsino 240 7265 0 5873 83 0 83 83 0 8 0
nchpl 144 13098 0 11484 60 0 60 60 0 8 0
uvmvnodes 72 6079 0 0 111 0 111 111 0 8 0
vnodes 208 6079 0 0 320 0 320 320 0 8 0
namei 1024 43113 0 43113 2 1 1 1 0 8 1
vcpupl 1984 8 0 0 1 0 1 1 0 8 0
vmpool 520 16 0 8 1 0 1 1 0 8 0
scsiplug 64 2 0 2 2 2 0 1 0 8 0
scxspl 192 44024 0 44024 11 10 1 7 0 8 1
plimitpl 152 142 0 135 1 0 1 1 0 8 0
sigapl 432 5081 0 5068 2 0 2 2 0 8 0
futexpl 56 330902 0 330902 2 1 1 1 0 8 1
knotepl 112 514 0 495 1 0 1 1 0 8 0
kqueuepl 104 405 0 403 1 0 1 1 0 8 0
pipepl 112 1374 0 1355 4 3 1 2 0 8 0
fdescpl 424 5082 0 5068 2 0 2 2 0 8 0
filepl 120 67673 0 67578 17 12 5 7 0 8 2
lockfpl 104 536 0 535 1 0 1 1 0 8 0
lockfspl 48 189 0 188 1 0 1 1 0 8 0
sessionpl 112 29 0 19 1 0 1 1 0 8 0
pgrppl 48 33 0 23 1 0 1 1 0 8 0
ucredpl 96 8411 0 8404 1 0 1 1 0 8 0
zombiepl 144 5068 0 5067 1 0 1 1 0 8 0
processpl 864 5098 0 5067 4 0 4 4 0 8 0
procpl 632 10487 0 10448 4 0 4 4 0 8 0
sosppl 128 10 0 10 3 3 0 1 0 8 0
sockpl 384 47647 0 47630 21 14 7 7 0 8 5
mcl64k 65536 881 0 881 89 56 33 33 0 8 33
mcl16k 16384 19 0 19 8 7 1 1 0 8 1
mcl12k 12288 46 0 46 8 8 0 1 0 8 0
mcl9k 9216 30 0 30 6 6 0 1 0 8 0
mcl8k 8192 3629 0 3629 2 1 1 1 0 8 1
mcl4k 4096 170 0 170 5 5 0 1 0 8 0
mcl2k2 2112 12 0 12 7 7 0 1 0 8 0
mcl2k 2048 79770 0 79728 26 18 8 14 0 8 2
mtagpl 80 66 0 66 3 3 0 1 0 8 0
mbufpl 256 180485 0 180403 62 43 19 23 0 8 8
bufpl 256 16352 0 10217 387 3 384 384 0 8 0
anonpl 16 436852 0 418240 137 45 92 92 0 62 15
amapchunkpl 152 20996 0 20890 45 36 9 18 0 158 3
amappl16 192 24342 0 23288 114 49 65 65 0 8 11
amappl15 184 1 0 1 1 1 0 1 0 8 0
amappl14 176 583 0 580 1 0 1 1 0 8 0
amappl13 168 2805 0 2804 2 1 1 1 0 8 0
amappl12 160 102 0 99 1 0 1 1 0 8 0
amappl11 152 1097 0 1084 1 0 1 1 0 8 0
amappl10 144 130 0 130 3 3 0 1 0 8 0
amappl9 136 963 0 955 1 0 1 1 0 8 0
amappl8 128 480 0 450 1 0 1 1 0 8 0
amappl7 120 204 0 198 1 0 1 1 0 8 0
amappl6 112 1081 0 1072 1 0 1 1 0 8 0
amappl5 104 318 0 308 1 0 1 1 0 8 0
amappl4 96 7946 0 7919 1 0 1 1 0 8 0
amappl3 88 483 0 476 1 0 1 1 0 8 0
amappl2 80 42709 0 42639 3 1 2 3 0 8 0
amappl1 72 103957 0 103561 34 26 8 20 0 8 0
amappl 80 10915 0 10876 1 0 1 1 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 64 131 0 2 3 0 3 3 0 8 0
uaddrrnd 24 5098 0 5068 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 5098 0 5068 1 0 1 1 0 8 0
vmmpekpl 168 26518 0 26488 2 0 2 2 0 8 0
vmmpepl 168 600696 0 598573 241 117 124 132 0 357 29
vmsppl 272 5081 0 5068 3 2 1 2 0 8 0
pdppl 4096 10202 0 10160 7 1 6 6 0 8 0
pvpl 32 1182343 0 1160875 346 122 224 304 0 265 49
pmappl 200 5097 0 5076 2 0 2 2 0 8 0
extentpl 40 41 0 26 1 0 1 1 0 8 0
phpool 112 714 0 157 17 0 17 17 0 8 0