panic: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 725
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*310694 90833 0 0x14000 0x40000200 0K softclock
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82573b50) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825e884c,ffffffff825e4aa7,2d5,ffffffff825447b5) at __assert+0x25 sys/kern/subr_prf.c:161
arptfree(fffffd8064bc8d28) at arptfree+0x105 sys/netinet/if_ether.c:725
arptimer(ffffffff82b15e28) at arptimer+0x80 sys/netinet/if_ether.c:131
timeout_run(ffffffff82b15e28) at timeout_run+0xcc sys/kern/kern_timeout.c:678
softclock_thread(ffff8000210f97a0) at softclock_thread+0x134 sys/kern/kern_timeout.c:802
end trace frame: 0x0, count: 8
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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: kernel diagnostic assertion "ifp != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/netinet/if_ether.c", line 725
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82573b50) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825e884c,ffffffff825e4aa7,2d5,ffffffff825447b5) at __assert+0x25 sys/kern/subr_prf.c:161
arptfree(fffffd8064bc8d28) at arptfree+0x105 sys/netinet/if_ether.c:725
arptimer(ffffffff82b15e28) at arptimer+0x80 sys/netinet/if_ether.c:131
timeout_run(ffffffff82b15e28) at timeout_run+0xcc sys/kern/kern_timeout.c:678
softclock_thread(ffff8000210f97a0) at softclock_thread+0x134 sys/kern/kern_timeout.c:802
end trace frame: 0x0, count: -7
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000211058e0
rbx 0xffffffff828eebff cpu_info_full_primary+0x2bff
rdx 0
rcx 0
rax 0xffff8000210f97a0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x426541d0f0f3af7d
r11 0x6bcfec9105d82daf
r12 0xffffffff828eea00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff8202d808 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000211058d0
ss 0
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (softclock) pid=310694 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=40000200<SYSTEM,CPUPEG>
pri=0, usrpri=50, nice=20
forw=0xffffffffffffffff, list=0xffff8000210f9a40,0xffff8000210f9510
process=0xffff8000ffffe568 user=0xffff800021100000, vmspace=0xffffffff82a714c8
estcpu=0, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
43420 283596 34970 0 2 0 syz-executor.6
21542 481758 40897 0 2 0 syz-executor.5
8736 243333 88948 0 2 0 syz-executor.4
8736 142066 88948 0 2 0x4000000 syz-executor.4
31508 245872 13321 0 2 0 syz-executor.0
55603 502933 41911 0 2 0 syz-executor.2
32676 92722 58459 0 2 0 syz-executor.7
40897 118225 95095 0 2 0x482 syz-executor.5
58459 34663 95095 0 3 0x82 nanoslp syz-executor.7
26478 213362 95095 0 2 0x2 syz-executor.3
39100 268966 95095 0 2 0x2 syz-executor.1
39532 203632 0 0 3 0x14280 nfsidl nfsio
68103 256543 0 0 3 0x14280 nfsidl nfsio
33935 243396 0 0 3 0x14280 nfsidl nfsio
46102 484925 0 0 3 0x14280 nfsidl nfsio
94891 15199 0 0 3 0x14280 nfsidl nfsio
33305 76257 0 0 3 0x14280 nfsidl nfsio
70761 258836 0 0 3 0x14280 nfsidl nfsio
6922 30614 0 0 3 0x14280 nfsidl nfsio
3561 504508 0 0 3 0x14280 nfsidl nfsio
45409 369605 0 0 3 0x14280 nfsidl nfsio
28273 369965 0 0 3 0x14280 nfsidl nfsio
31845 157802 0 0 3 0x14280 nfsidl nfsio
15185 14597 0 0 3 0x14280 nfsidl nfsio
43918 391999 0 0 3 0x14280 nfsidl nfsio
25072 236733 0 0 3 0x14280 nfsidl nfsio
81241 128245 0 0 3 0x14280 nfsidl nfsio
92833 444261 0 0 3 0x14280 nfsidl nfsio
21942 157121 0 0 3 0x14280 nfsidl nfsio
29108 110314 0 0 3 0x14280 nfsidl nfsio
59903 497848 0 0 3 0x14280 nfsidl nfsio
25097 360432 1 0 3 0x100083 ttyin getty
41911 430361 95095 0 3 0x82 nanoslp syz-executor.2
34970 67457 95095 0 2 0x482 syz-executor.6
13321 427633 95095 0 3 0x82 nanoslp syz-executor.0
88948 29841 95095 0 2 0x482 syz-executor.4
36954 459010 0 0 3 0x14200 bored sosplice
95095 313637 94724 0 3 0x82 thrsleep syz-fuzzer
95095 347276 94724 0 2 0x4000482 syz-fuzzer
95095 216867 94724 0 3 0x4000082 thrsleep syz-fuzzer
95095 98473 94724 0 3 0x4000082 thrsleep syz-fuzzer
95095 113722 94724 0 2 0x4000482 syz-fuzzer
95095 514734 94724 0 3 0x4000082 kqread syz-fuzzer
95095 14682 94724 0 3 0x4000082 thrsleep syz-fuzzer
95095 354922 94724 0 3 0x4000082 thrsleep syz-fuzzer
95095 181306 94724 0 3 0x4000082 thrsleep syz-fuzzer
94724 57148 80756 0 3 0x10008a sigsusp ksh
80756 507225 84931 0 3 0x9a poll sshd
84931 219685 1 0 3 0x88 poll sshd
48477 311193 30427 74 3 0x100092 bpf pflogd
30427 408316 1 0 3 0x80 netio pflogd
89226 423374 13580 73 3 0x100090 kqread syslogd
13580 200133 1 0 3 0x100082 netio syslogd
64892 7275 1 0 3 0x100080 kqread resolvd
41660 290192 62020 77 3 0x100092 kqread dhcpleased
47109 506078 62020 77 3 0x100092 kqread dhcpleased
62020 204268 1 0 3 0x80 kqread dhcpleased
828 241975 0 0 2 0x14200 smr
18305 442758 0 0 2 0x14200 zerothread
35741 286869 0 0 3 0x14200 aiodoned aiodoned
37891 228646 0 0 3 0x14200 syncer update
19656 261355 0 0 3 0x14200 cleaner cleaner
2843 424730 0 0 3 0x14200 reaper reaper
38357 382717 0 0 3 0x14200 pgdaemon pagedaemon
19453 322764 0 0 3 0x14200 bored viomb
22335 400265 0 0 3 0x40014200 acpi0 acpi0
64186 332701 0 0 7 0x40014200 idle1
33732 74532 0 0 3 0x14200 bored softnet
43175 327201 0 0 2 0x14200 systqmp
23957 52230 0 0 3 0x14200 bored systq
*90833 310694 0 0 7 0x40014200 softclock
83339 336447 0 0 3 0x40014200 idle0
1 407831 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
Process 90833 (softclock) thread 0xffff8000210f97a0 (310694)
exclusive rwlock netlock r = 0 (0xffffffff829612a0)
#0 witness_lock+0x44d
#1 arptimer+0x22 sys/netinet/if_ether.c:129
#2 timeout_run+0xcc sys/kern/kern_timeout.c:678
#3 softclock_thread+0x134 sys/kern/kern_timeout.c:802
#4 proc_trampoline+0x1c
shared rwlock timeout r = 0 (0xffffffff828ef5a0)
#0 witness_lock+0x44d
#1 timeout_run+0xb7 sys/kern/kern_timeout.c:674
#2 softclock_thread+0x134 sys/kern/kern_timeout.c:802
#3 proc_trampoline+0x1c
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82b2abb0)
#0 witness_lock+0x44d
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x3d3 sys/kern/sched_bsd.c:416
#3 sleep_finish+0x1b2 sys/kern/kern_synch.c:433
#4 softclock_thread+0xd9 sys/kern/kern_timeout.c:797
#5 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10226 6597K 10805K 78643K 46465 0
pcb 13 20K 24K 78643K 3428 0
rtable 371 48K 48K 78643K 5358 0
ifaddr 136 32K 33K 78643K 2379 0
sysctl 2 0K 0K 78643K 2 0
counters 58 35K 36K 78643K 382 0
ioctlops 0 0K 8K 78643K 34431 0
iov 0 0K 32K 78643K 2546 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1443 90K 91K 78643K 11923 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 160 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 4039 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 16 57K 85K 78643K 24938 0
sigio 0 0K 0K 78643K 237 0
proc 73 87K 124K 78643K 2383 0
subproc 104 6K 6K 78643K 696 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 1662 0
in_multi 96 6K 6K 78643K 1135 0
ether_multi 1 0K 0K 78643K 237 0
mrt 10 0K 0K 78643K 144 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 247 1102K 1102K 78643K 247 0
exec 0 0K 2K 78643K 3582 0
pfkey data 0 0K 0K 78643K 7 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 7 26K 26K 78643K 7 0
UVM amap 606 1281K 1283K 78643K 319987 0
UVM aobj 131 6K 6K 78643K 156 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 1559 0
NDP 14 0K 1K 78643K 294 0
temp 219 4826K 8914K 78643K 218910 0
kqueue 10 14K 22K 78643K 869 0
SYN cache 2 16K 16K 78643K 2 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 1447 0 1444 20 19 1 4 0 8 0
rtentry 112 781 0 676 4 0 4 4 0 8 0
unpcb 136 15413 0 15398 170 161 9 13 0 8 8
syncache 296 182 0 182 28 28 0 1 0 8 0
tcpqe 32 50 0 50 20 20 0 1 0 8 0
tcpcb 736 17843 0 17815 406 401 5 20 0 8 2
arp 120 108 0 90 1 0 1 1 0 8 0
inpcb 304 32117 0 32110 314 308 6 16 0 8 5
rttmr 72 42 0 41 13 12 1 1 0 8 0
nd6 48 182 0 157 1 0 1 1 0 8 0
pkpcb 40 121 0 121 19 19 0 1 0 8 0
kcovpl 48 46 0 38 1 0 1 1 0 8 0
ppxss 1248 25 0 25 9 9 0 1 0 8 0
pfstscr 40 232 0 232 11 11 0 1 0 8 0
pffrag 232 98 0 98 10 10 0 1 0 482 0
pffrnode 88 98 0 98 10 10 0 1 0 8 0
pffrent 40 1418 0 1418 14 14 0 1 0 8 0
pfosfp 40 1449 0 1446 6 5 1 5 0 8 0
pfosfpen 112 1449 0 1442 22 21 1 21 0 8 0
pfrke_plain 168 156 0 144 1 0 1 1 0 8 0
pfrktable 1344 1184 0 1124 21 15 6 6 0 8 1
pftag 88 101 0 87 1 0 1 1 0 8 0
pfstitem 24 33 0 31 1 0 1 1 0 8 0
pfstkey 112 358 0 356 1 0 1 1 0 8 0
pfstate 320 190 0 188 2 1 1 2 0 8 0
pfrule 1360 13200 0 10765 206 3 203 203 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 3695 0 3208 44 13 31 31 0 8 0
art_table 32 3697 0 3208 4 0 4 4 0 8 0
art_node 16 764 0 669 1 0 1 1 0 8 0
sysvmsgpl 40 81 0 74 1 0 1 1 0 8 0
semupl 112 8 0 8 1 1 0 1 0 8 0
semapl 112 4037 0 4027 1 0 1 1 0 8 0
shmpl 112 153 0 25 5 1 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 32238 0 30728 95 0 95 95 0 8 0
ffsino 272 32238 0 30728 102 1 101 101 0 8 0
nchpl 144 64564 0 62937 63 0 63 63 0 8 0
rtmask 32 40 0 32 1 0 1 1 0 8 0
uvmvnodes 80 8188 0 0 168 0 168 168 0 8 0
vnodes 224 8188 0 0 482 0 482 482 0 8 0
namei 1024 223802 0 223802 10 9 1 2 0 8 1
percpumem 16 203 0 162 1 0 1 1 0 8 0
vcpupl 2048 114 0 0 15 0 15 15 0 8 0
vmpool 560 130 0 16 9 0 9 9 0 8 0
pfiaddrpl 120 1796 0 930 28 1 27 27 0 8 0
scsiplug 72 9 0 9 3 3 0 1 0 8 0
scxspl 216 219530 0 219530 41 40 1 8 0 8 1
plimitpl 152 2622 0 2607 1 0 1 1 0 8 0
sigapl 424 25229 0 25165 9 1 8 8 0 8 0
futexpl 64 244928 0 244928 8 7 1 1 0 8 1
knotepl 112 325 0 0 5 0 5 5 0 8 0
kqueuepl 216 19116 0 19059 191 183 8 13 0 8 4
pipepl 336 4878 0 4850 145 140 5 13 0 8 2
fdescpl 496 25150 0 25121 7 3 4 5 0 8 0
filepl 152 186332 0 186094 309 290 19 24 0 8 8
lockfpl 104 6455 0 6453 12 11 1 2 0 8 0
lockfspl 48 1858 0 1856 1 0 1 1 0 8 0
sessionpl 144 64 0 47 1 0 1 1 0 8 0
pgrppl 48 157 0 140 1 0 1 1 0 8 0
ucredpl 96 16185 0 16171 1 0 1 1 0 8 0
zombiepl 144 25165 0 25165 3 2 1 1 0 8 1
processpl 1064 25229 0 25165 5 0 5 5 0 8 0
procpl 672 72133 0 72060 36 28 8 10 0 8 1
srpgc 96 23 0 23 10 10 0 1 0 8 0
sosppl 168 171 0 171 28 28 0 1 0 8 0
sockpl 480 49157 0 49132 934 922 12 46 0 8 8
mcl64k 65536 34 0 0 3 0 3 3 0 8 0
mcl16k 16384 47 0 0 4 1 3 3 0 8 0
mcl12k 12288 65 0 0 2 0 2 2 0 8 0
mcl9k 9216 34 0 0 3 1 2 2 0 8 0
mcl8k 8192 49 0 0 4 1 3 3 0 8 0
mcl4k 4096 65 0 0 3 0 3 3 0 8 0
mcl2k2 2112 24 0 0 2 0 2 2 0 8 0
mcl2k 2048 528 0 0 33 7 26 26 0 8 0
mtagpl 96 999 0 0 12 1 11 12 0 8 0
mbufpl 256 2250 0 0 102 0 102 102 0 8 0
bufpl 288 45076 0 36888 585 0 585 585 0 8 0
anonpl 24 7228340 0 7200962 494 300 194 198 0 186 6
amapchunkpl 152 782885 0 782043 175 134 41 53 0 158 0
amappl16 200 71023 0 69843 225 153 72 75 0 8 2
amappl15 192 6974 0 6966 1 0 1 1 0 8 0
amappl14 184 3142 0 3135 1 0 1 1 0 8 0
amappl13 176 2693 0 2692 1 0 1 1 0 8 0
amappl12 168 4075 0 4065 1 0 1 1 0 8 0
amappl11 160 1522 0 1507 1 0 1 1 0 8 0
amappl10 152 2001 0 1993 1 0 1 1 0 8 0
amappl9 144 4077 0 4070 1 0 1 1 0 8 0
amappl8 136 5102 0 4964 5 0 5 5 0 8 0
amappl7 128 3707 0 3696 1 0 1 1 0 8 0
amappl6 120 3923 0 3894 2 1 1 2 0 8 0
amappl5 112 22239 0 22218 1 0 1 1 0 8 0
amappl4 104 6027 0 5991 6 4 2 2 0 8 0
amappl3 96 7419 0 7404 1 0 1 1 0 8 0
amappl2 88 5786 0 5726 3 1 2 3 0 8 0
amappl1 80 456526 0 455984 29 16 13 19 0 8 0
amappl 88 317595 0 317273 13 4 9 9 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 72 155 0 25 3 0 3 3 0 8 0
uaddrrnd 24 25280 0 25137 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 25280 0 25137 1 0 1 1 0 8 0
vmmpekpl 168 185873 0 185789 5 0 5 5 0 8 0
vmmpepl 168 2285326 0 2281965 557 390 167 178 0 357 0
vmsppl 368 25279 0 25137 16 2 14 14 0 8 0
rwobjpl 56 561675 0 551078 182 30 152 155 0 8 0
pdppl 4096 50567 0 50388 886 703 183 183 0 8 4
pvpl 32 12075811 0 12051937 832 597 235 278 0 265 14
pmappl 248 25279 0 25137 11 1 10 10 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 2667 0 1283 40 0 40 40 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82573b50) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825e884c,ffffffff825e4aa7,2d5,ffffffff825447b5) at __assert+0x25 sys/kern/subr_prf.c:161
arptfree(fffffd8064bc8d28) at arptfree+0x105 sys/netinet/if_ether.c:725
arptimer(ffffffff82b15e28) at arptimer+0x80 sys/netinet/if_ether.c:131
timeout_run(ffffffff82b15e28) at timeout_run+0xcc sys/kern/kern_timeout.c:678
softclock_thread(ffff8000210f97a0) at softclock_thread+0x134 sys/kern/kern_timeout.c:802
end trace frame: 0x0, count: -7
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: 10
ddb{1}> trace
x86_ipi_db(ffff800020ce8ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
acpicpu_idle() at acpicpu_idle+0x312 sys/dev/acpi/acpicpu.c:1206
sched_idle(ffff800020ce8ff0) at sched_idle+0x417 sys/kern/kern_sched.c:178
end trace frame: 0x0, count: -5