panic:W ARpNoIoNlG_c:a ScPhLe _NiOtTe mL_OmWaEgRicED_ cOhNec kS:Y SmCbAuLfLp l 2c p51u6 5f0r5e4e2 3li sEXtI T mo0d ai
fi
Stopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 22718 38088 0 0x2 0 1 syz-executor.1
7717 87418 0 0x14000 0x200 0 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffd0150, count: 14
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
pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806d996f00+16 0x0!=0x43799f272346bc21
ddb{1}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffd0150, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff800022d8f5e0
rbx 0
rdx 0xffff800020ec7d58
rcx 0
rax 0x39
r8 0xffffffff821b427f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xc3b8ccd093e9fd17
r12 0
r13 0
r14 0xffff800020ec7d58
r15 0
rip 0xffffffff81da43f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800022d8f560
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{1}> show proc
PROC (syz-executor.1) pid=22718 stat=onproc
flags process=2<EXEC,8ORPHAN> proc=0
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020e6dad8,0xffff800020ec6778
process=0xffff800020e81720 user=0xffff800022d8a000, vmspace=0xfffffd807efffb80
estcpu=36, cpticks=3, pctcpu=0.13
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
53617 422853 38088 0 2 0 syz-executor.1
11203 418095 63416 0 2 0 syz-executor.0
11203 490542 63416 0 3 0x4000080 netio syz-executor.0
6115 248604 0 0 3 0x14200 acct acct
73132 101849 1 0 3 0x100083 ttyin getty
32783 388138 0 0 3 0x14200 bored sosplice
63416 120547 53689 0 2 0x482 syz-executor.0
*38088 22718 53689 0 7 0x2 syz-executor.1
53689 347411 8216 0 3 0x82 thrsleep syz-fuzzer
53689 41484 8216 0 2 0x4000482 syz-fuzzer
53689 209694 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 318604 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 44527 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 114680 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 191881 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 357726 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 459300 8216 0 3 0x4000082 thrsleep syz-fuzzer
53689 414452 8216 0 3 0x4000082 kqread syz-fuzzer
53689 508935 8216 0 3 0x4000082 thrsleep syz-fuzzer
8216 352945 52935 0 3 0x10008a pause ksh
52935 409674 8224 0 3 0x52 netlock sshd
8224 136167 1 0 3 0x80 select sshd
65937 74248 82264 74 3 0x100092 bpf pflogd
82264 511468 1 0 3 0x80 netio pflogd
34824 435082 93298 73 3 0x100090 kqread syslogd
93298 157454 1 0 3 0x100082 netio syslogd
87130 169966 1 77 3 0x100090 poll dhclient
99427 325930 1 0 3 0x80 poll dhclient
12611 121824 0 0 3 0x14200 bored smr
98661 266814 0 0 2 0x14200 zerothread
68667 169852 0 0 3 0x14200 aiodoned aiodoned
89498 179331 0 0 3 0x14200 syncer update
27969 433599 0 0 3 0x14200 cleaner cleaner
98008 85047 0 0 3 0x14200 reaper reaper
91394 493704 0 0 3 0x14200 pgdaemon pagedaemon
28940 43368 0 0 3 0x14200 bored crynlk
19137 171577 0 0 3 0x14200 bored crypto
14711 454216 0 0 3 0x40014200 acpi0 acpi0
81402 108942 0 0 3 0x40014200 idle1
87418 7717 0 0 7 0x14200 softnet
22687 302915 0 0 3 0x14200 bored systqmp
153 120262 0 0 3 0x14200 bored systq
90392 95766 0 0 3 0x40014200 bored softclock
22620 315486 0 0 3 0x40014200 idle0
1 472809 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8006ce6078)
#0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pmap_enter+0x698 pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1032 [inline]
#3 pmap_enter+0x698 sys/arch/amd64/amd64/pmap.c:2788
#4 uvm_km_kmemalloc_pla+0x355 sys/uvm/uvm_km.c:390
#5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#6 fork1+0x271 sys/kern/kern_fork.c:365
#7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#8 Xsyscall+0x128
Process 38088 (syz-executor.1) thread 0xffff800020ec7d58 (22718)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82672eb0)
#0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164
#1 syscall+0x400 mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x400 sys/arch/amd64/amd64/trap.c:570
#2 Xsyscall+0x128
exclusive mutex &(curpg)->mdpage.pv_mtx r = 0 (0xfffffd8006ce6078)
#0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pmap_enter+0x698 pmap_enter_pv sys/arch/amd64/amd64/pmap.c:1032 [inline]
#3 pmap_enter+0x698 sys/arch/amd64/amd64/pmap.c:2788
#4 uvm_km_kmemalloc_pla+0x355 sys/uvm/uvm_km.c:390
#5 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#6 fork1+0x271 sys/kern/kern_fork.c:365
#7 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#8 Xsyscall+0x128
Process 87418 (softnet) thread 0xffff800020e18750 (7717)
shared rwlock netlock r = 0 (0xffffffff8248d3b8)
#0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164
#1 if_input_process+0x84 sys/net/if.c:941
#2 ifiq_process+0x80 sys/net/ifq.c:646
#3 taskq_thread+0x9c sys/kern/kern_task.c:369
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff80000002b0e0)
#0 witness_lock+0x4c5 sys/kern/subr_witness.c:1164
#1 taskq_thread+0x8f sys/kern/kern_task.c:368
#2 proc_trampoline+0x1c
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9545 6427K 6874K 78643K 11348 0
pcb 13 8K 8K 78643K 150 0
rtable 87 3K 4K 78643K 370 0
ifaddr 88 15K 16K 78643K 163 0
counters 43 33K 34K 78643K 61 0
ioctlops 0 0K 4K 78643K 1490 0
iov 1 12K 16K 78643K 72 0
mount 1 1K 1K 78643K 1 0
vnodes 1223 77K 77K 78643K 1506 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 11 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 64 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 6 17K 25K 78643K 507 0
sigio 0 0K 0K 78643K 3 0
proc 62 63K 83K 78643K 535 0
subproc 32 2K 2K 78643K 51 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 62 0
in_multi 62 3K 3K 78643K 176 0
ether_multi 1 0K 0K 78643K 30 0
mrt 0 0K 0K 78643K 10 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 43 201K 201K 78643K 43 0
exec 0 0K 1K 78643K 278 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 116 87K 103K 78643K 2660 0
UVM aobj 24 2K 3K 78643K 30 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 140 0
NDP 16 0K 0K 78643K 34 0
temp 121 3040K 3115K 78643K 11435 0
kqueue 3 4K 14K 78643K 42 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
arp 64 9 0 6 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 45 0 43 1 0 1 1 0 8 0
rtentry 112 74 0 42 2 0 2 2 0 8 0
unpcb 120 336 0 323 1 0 1 1 0 8 0
syncache 264 12 0 12 2 2 0 1 0 8 0
tcpqe 32 125 0 125 2 2 0 1 0 8 0
tcpcb 544 244 0 240 1 0 1 1 0 8 0
inpcb 280 1350 0 1343 2 0 2 2 0 8 1
rttmr 72 3 0 3 2 1 1 1 0 8 1
nd6 48 12 0 10 1 0 1 1 0 8 0
pkpcb 40 4 0 4 2 1 1 1 0 8 1
ppxss 1128 5 0 5 2 1 1 1 0 8 1
pffrag 232 4 0 4 3 2 1 1 0 482 1
pffrnode 88 4 0 4 3 2 1 1 0 8 1
pffrent 40 95 0 95 3 2 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 56 0 7 1 0 1 1 0 8 0
pfstkey 112 56 0 7 2 0 2 2 0 8 0
pfstate 328 56 0 7 5 0 5 5 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 350 0 182 12 0 12 12 0 8 1
art_table 32 352 0 182 2 0 2 2 0 8 0
art_node 16 73 0 44 1 0 1 1 0 8 0
sysvmsgpl 40 14 0 7 1 0 1 1 0 8 0
semupl 112 2 0 2 1 1 0 1 0 8 0
semapl 112 54 0 44 1 0 1 1 0 8 0
shmpl 112 28 0 6 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 2173 0 767 46 0 46 46 0 8 0
ffsino 272 2173 0 767 95 0 95 95 0 8 0
nchpl 144 3028 0 1435 61 0 61 61 0 8 0
uvmvnodes 72 2396 0 0 44 0 44 44 0 8 0
vnodes 208 2396 0 0 127 0 127 127 0 8 0
namei 1024 8395 0 8395 1 0 1 1 0 8 1
percpumem 16 41 0 9 1 0 1 1 0 8 0
vcpupl 1984 6 0 0 1 0 1 1 0 8 0
vmpool 560 9 0 3 1 0 1 1 0 8 0
scsiplug 64 1 0 1 1 1 0 1 0 8 0
scxspl 192 9963 0 9962 10 7 3 7 0 8 2
plimitpl 152 40 0 32 1 0 1 1 0 8 0
sigapl 424 723 0 689 4 0 4 4 0 8 0
futexpl 56 9056 0 9056 1 0 1 1 0 8 1
knotepl 112 107 0 88 1 0 1 1 0 8 0
kqueuepl 144 104 0 102 1 0 1 1 0 8 0
pipelkpl 48 135 0 125 1 0 1 1 0 8 0
pipepl 120 270 0 251 1 0 1 1 0 8 0
fdescpl 496 706 0 689 3 0 3 3 0 8 0
filepl 152 4629 0 4527 5 0 5 5 0 8 1
lockfpl 104 162 0 161 1 0 1 1 0 8 0
lockfspl 48 63 0 62 1 0 1 1 0 8 0
sessionpl 112 21 0 10 1 0 1 1 0 8 0
pgrppl 48 21 0 10 1 0 1 1 0 8 0
ucredpl 96 346 0 337 1 0 1 1 0 8 0
zombiepl 144 689 0 689 1 0 1 1 0 8 1
processpl 984 723 0 689 5 0 5 5 0 8 0
procpl 624 1821 0 1776 4 0 4 4 0 8 0
srpgc 64 6 0 6 2 1 1 1 0 8 1
sosppl 128 6 0 6 2 1 1 1 0 8 1
sockpl 400 1744 0 1722 4 0 4 4 0 8 1
mcl64k 65536 8 0 0 1 0 1 1 0 8 0
mcl12k 12288 5 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 7 0 0 1 0 1 1 0 8 0
mcl2k2 2112 1 0 0 1 0 1 1 0 8 0
mcl2k 2048 167 0 0 20 0 20 20 0 8 0
mtagpl 80 20 0 0 1 0 1 1 0 8 0
mbufpl 256 234 0 0 15 0 15 15 0 8 0
bufpl 280 5532 0 178 383 0 383 383 0 8 0
anonpl 16 73304 0 59443 63 1 62 62 0 124 3
amapchunkpl 152 3814 0 3679 9 3 6 8 0 158 0
amappl16 192 3008 0 2223 43 0 43 43 0 8 3
amappl15 184 2 0 0 1 0 1 1 0 8 0
amappl14 176 210 0 208 3 2 1 1 0 8 0
amappl13 168 269 0 267 1 0 1 1 0 8 0
amappl12 160 12 0 10 1 0 1 1 0 8 0
amappl11 152 73 0 54 1 0 1 1 0 8 0
amappl10 144 51 0 44 1 0 1 1 0 8 0
amappl9 136 395 0 391 1 0 1 1 0 8 0
amappl8 128 326 0 308 1 0 1 1 0 8 0
amappl7 120 147 0 135 1 0 1 1 0 8 0
amappl6 112 28 0 24 1 0 1 1 0 8 0
amappl5 104 610 0 592 1 0 1 1 0 8 0
amappl4 96 752 0 722 1 0 1 1 0 8 0
amappl3 88 327 0 321 1 0 1 1 0 8 0
amappl2 80 4671 0 4602 3 1 2 3 0 8 0
amappl1 72 25196 0 24755 26 15 11 20 0 8 0
amappl 80 2090 0 2042 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 18 0 17 1 0 1 1 0 8 0
aobjpl 64 29 0 6 1 0 1 1 0 8 0
uaddrrnd 24 715 0 692 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 715 0 692 1 0 1 1 0 8 0
vmmpekpl 168 9331 0 9293 2 0 2 2 0 8 0
vmmpepl 168 92599 0 90601 114 22 92 107 0 357 3
vmsppl 368 714 0 692 3 0 3 3 0 8 0
pdppl 4096 1438 0 1390 7 0 7 7 0 8 0
pvpl 32 240476 0 223436 160 2 158 158 0 265 14
pmappl 232 714 0 692 3 1 2 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 174 0 3 5 0 5 5 0 8 0