panic: WApRoNolI_NGc:a chSePL_ itNeOTm _mLOagWEiRcE_Dc hOecN k:SY SmCbuALfLp l 2 c-pu94 59fr7e1e59 8li EsXt ITm o0d iafi
edStopped at savectx+0xb1: movl $0,%gs:0x530
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*372403 49318 0 0x2 0 0 syz-executor.0
439627 26360 0 0x14000 0x200 1 softnet
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffcc490, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
pool_cache_item_magic_check: mbufpl cpu free list modified: item addr 0xfffffd806909c700+16 0x0!=0xe56fcb51226879cb
ddb{0}> trace
savectx() at savectx+0xb1
end of kernel
end trace frame: 0x7f7ffffcc490, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800020b7d840
rbx 0
rdx 0xffff800020a7dd48
rcx 0
rax 0x3a
r8 0xffffffff8167311f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xfda88a10f5424066
r12 0
r13 0
r14 0xffff800020a7dd48
r15 0
rip 0xffffffff8167a3f1 savectx+0xb1
cs 0x8
rflags 0x46
rsp 0xffff800020b7d7c0
ss 0x10
savectx+0xb1: movl $0,%gs:0x530
ddb{0}> show proc
PROC (syz-executor.0) pid=372403 stat=onproc
flags process=2<EXEC> proc=0
pri=74, usrpri=74, nice=20
forw=0xffffffffffffffff, list=0xffff800020a7c008,0xffff800020ac3d68
process=0xffff800020a903d0 user=0xffff800020b78000, vmspace=0xfffffd807efffa10
estcpu=36, cpticks=1, pctcpu=0.6
user=0, sys=1, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
42551 469164 49318 0 2 0 syz-executor.0
5930 291234 22419 0 2 0 syz-executor.1
47644 409398 0 0 3 0x14200 bored sosplice
22419 262609 47424 0 3 0x82 nanosleep syz-executor.1
*49318 372403 47424 0 7 0x2 syz-executor.0
47424 139286 33857 0 3 0x82 nanosleep syz-fuzzer
47424 199850 33857 0 3 0x4000082 nanosleep syz-fuzzer
47424 305863 33857 0 3 0x4000082 thrsleep syz-fuzzer
47424 328945 33857 0 3 0x4000082 thrsleep syz-fuzzer
47424 91801 33857 0 3 0x4000082 thrsleep syz-fuzzer
47424 38666 33857 0 3 0x4000082 thrsleep syz-fuzzer
47424 500755 33857 0 3 0x4000082 thrsleep syz-fuzzer
47424 322983 33857 0 3 0x4000082 thrsleep syz-fuzzer
47424 410978 33857 0 3 0x4000082 kqread syz-fuzzer
47424 241141 33857 0 3 0x4000082 thrsleep syz-fuzzer
33857 378033 63848 0 3 0x10008a pause ksh
63848 288110 27028 0 3 0x92 select sshd
94203 14101 1 0 3 0x100083 ttyin getty
27028 45159 1 0 3 0x80 select sshd
33827 428183 76071 74 3 0x100092 bpf pflogd
76071 350486 1 0 3 0x80 netio pflogd
98980 24589 23369 73 3 0x100090 kqread syslogd
23369 198865 1 0 3 0x100082 netio syslogd
76997 478498 1 77 3 0x100090 poll dhclient
48074 416369 1 0 3 0x80 poll dhclient
93549 504394 0 0 2 0x14200 zerothread
89212 479098 0 0 3 0x14200 aiodoned aiodoned
36906 453539 0 0 3 0x14200 syncer update
39744 335920 0 0 3 0x14200 cleaner cleaner
77082 483634 0 0 3 0x14200 reaper reaper
56290 387003 0 0 3 0x14200 pgdaemon pagedaemon
67904 417569 0 0 3 0x14200 bored crynlk
34932 45234 0 0 3 0x14200 bored crypto
18720 310249 0 0 3 0x40014200 acpi0 acpi0
30704 259132 0 0 3 0x40014200 idle1
26360 439627 0 0 7 0x14200 softnet
52622 85548 0 0 3 0x14200 bored systqmp
99227 33202 0 0 3 0x14200 bored systq
23146 111371 0 0 3 0x40014200 bored softclock
85549 59299 0 0 3 0x40014200 idle0
89712 165132 0 0 3 0x14200 bored smr
1 144328 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff826409e0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_pmr_getpages+0xd2c sys/uvm/uvm_pmemrange.c:1170
#4 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790
#5 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x295 sys/kern/kern_fork.c:367
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 49318 (syz-executor.0) thread 0xffff800020a7dd48 (372403)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8263e0d8)
#0 witness_lock+0x52e 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 &uvm.fpageqlock r = 0 (0xffffffff826409e0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 mtx_enter_try+0x102
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_pmr_getpages+0xd2c sys/uvm/uvm_pmemrange.c:1170
#4 uvm_pglistalloc+0x362 sys/uvm/uvm_page.c:790
#5 uvm_km_kmemalloc_pla+0x238 sys/uvm/uvm_km.c:366
#6 uvm_uarea_alloc+0x51 sys/uvm/uvm_glue.c:274
#7 fork1+0x295 sys/kern/kern_fork.c:367
#8 syscall+0x4a4 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#8 syscall+0x4a4 sys/arch/amd64/amd64/trap.c:570
#9 Xsyscall+0x128
Process 26360 (softnet) thread 0xffff800020a28270 (439627)
shared rwlock netlock r = 0 (0xffffffff824dac08)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 if_input_process+0x84 sys/net/if.c:941
#2 ifiq_process+0x80 sys/net/ifq.c:607
#3 taskq_thread+0x9c sys/kern/kern_task.c:369
#4 proc_trampoline+0x1c
shared rwlock softnet r = 0 (0xffff80000002b0e0)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 taskq_thread+0x8f sys/kern/kern_task.c:368
#2 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9493 6405K 6791K 78643K 10755 0
pcb 13 8K 8K 78643K 39 0
rtable 105 3K 3K 78643K 247 0
ifaddr 57 12K 13K 78643K 80 0
counters 43 33K 34K 78643K 49 0
ioctlops 0 0K 4K 78643K 1474 0
iov 0 0K 12K 78643K 7 0
mount 1 1K 1K 78643K 1 0
vnodes 1217 76K 77K 78643K 1271 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 3 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 16 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 6 17K 25K 78643K 107 0
sigio 0 0K 0K 78643K 1 0
proc 60 63K 95K 78643K 447 0
subproc 32 2K 2K 78643K 34 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 86 0
in_multi 46 2K 2K 78643K 51 0
ether_multi 1 0K 0K 78643K 3 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 37 175K 175K 78643K 37 0
exec 0 0K 1K 78643K 209 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 117 38K 42K 78643K 1317 0
UVM aobj 10 2K 2K 78643K 10 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 16 0
NDP 8 0K 0K 78643K 15 0
temp 79 3009K 3073K 78643K 2319 0
kqueue 3 4K 20K 78643K 15 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
arp 64 8 0 2 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 27 0 25 1 0 1 1 0 8 0
rtentry 112 51 0 7 2 0 2 2 0 8 0
unpcb 120 76 0 66 1 0 1 1 0 8 0
syncache 264 5 0 5 2 1 1 1 0 8 1
sackhl 24 1 0 1 1 0 1 1 0 8 1
tcpqe 32 25 0 25 2 1 1 1 0 8 1
tcpcb 544 155 0 151 2 0 2 2 0 8 1
inpcb 280 253 0 246 3 1 2 3 0 8 1
nd6 48 4 0 0 1 0 1 1 0 8 0
pkpcb 40 4 0 4 1 1 0 1 0 8 0
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 29 0 2 1 0 1 1 0 8 0
pfstkey 112 29 0 2 1 0 1 1 0 8 0
pfstate 328 29 0 0 3 0 3 3 0 8 0
pfrule 1360 21 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 226 0 9 14 0 14 14 0 8 0
art_table 32 227 0 9 2 0 2 2 0 8 0
art_node 16 50 0 10 1 0 1 1 0 8 0
sysvmsgpl 40 2 0 0 1 0 1 1 0 8 0
semupl 112 3 0 3 1 0 1 1 0 8 1
semapl 112 14 0 4 1 0 1 1 0 8 0
shmpl 112 8 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 1526 0 119 46 0 46 46 0 8 0
ffsino 272 1526 0 119 95 0 95 95 0 8 0
nchpl 144 1890 0 273 61 0 61 61 0 8 0
uvmvnodes 72 1607 0 0 30 0 30 30 0 8 0
vnodes 208 1607 0 0 85 0 85 85 0 8 0
namei 1024 4995 0 4995 1 0 1 1 0 8 1
percpumem 16 35 0 3 1 0 1 1 0 8 0
vcpupl 1984 1 0 0 1 0 1 1 0 8 0
vmpool 560 1 0 0 1 0 1 1 0 8 0
scxspl 192 5619 0 5619 8 4 4 7 0 8 4
plimitpl 152 21 0 13 1 0 1 1 0 8 0
sigapl 432 306 0 290 3 1 2 3 0 8 0
futexpl 56 1830 0 1830 1 0 1 1 0 8 1
knotepl 112 68 0 49 1 0 1 1 0 8 0
kqueuepl 104 36 0 34 1 0 1 1 0 8 0
pipelkpl 48 96 0 86 1 0 1 1 0 8 0
pipepl 120 192 0 173 1 0 1 1 0 8 0
fdescpl 496 307 0 290 3 0 3 3 0 8 0
filepl 152 1936 0 1836 6 0 6 6 0 8 2
lockfpl 104 35 0 34 1 0 1 1 0 8 0
lockfspl 48 15 0 14 1 0 1 1 0 8 0
sessionpl 112 18 0 7 1 0 1 1 0 8 0
pgrppl 48 22 0 11 1 0 1 1 0 8 0
ucredpl 96 112 0 103 1 0 1 1 0 8 0
zombiepl 144 290 0 290 1 0 1 1 0 8 1
processpl 960 323 0 290 5 0 5 5 0 8 0
procpl 624 521 0 479 4 0 4 4 0 8 0
sockpl 400 360 0 341 5 0 5 5 0 8 3
mcl64k 65536 6 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 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 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 172 0 0 21 0 21 21 0 8 0
mtagpl 80 7 0 0 1 0 1 1 0 8 0
mbufpl 256 187 0 0 11 0 11 11 0 8 0
bufpl 280 5366 0 191 370 0 370 370 0 8 0
anonpl 16 52921 0 36794 82 1 81 81 0 125 14
amapchunkpl 152 2238 0 2095 20 5 15 20 0 158 7
amappl16 192 1735 0 866 55 2 53 55 0 8 8
amappl15 184 66 0 62 1 0 1 1 0 8 0
amappl14 176 28 0 26 1 0 1 1 0 8 0
amappl12 160 52 0 49 2 1 1 1 0 8 0
amappl11 152 59 0 43 1 0 1 1 0 8 0
amappl10 144 52 0 44 1 0 1 1 0 8 0
amappl9 136 601 0 597 1 0 1 1 0 8 0
amappl8 128 117 0 98 1 0 1 1 0 8 0
amappl7 120 134 0 122 1 0 1 1 0 8 0
amappl6 112 60 0 52 1 0 1 1 0 8 0
amappl5 104 176 0 161 1 0 1 1 0 8 0
amappl4 96 557 0 524 2 1 1 2 0 8 0
amappl3 88 116 0 109 1 0 1 1 0 8 0
amappl2 80 1493 0 1425 3 1 2 3 0 8 0
amappl1 72 16794 0 16356 25 15 10 20 0 8 0
amappl 80 788 0 742 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 9 0 0 1 0 1 1 0 8 0
uaddrrnd 24 308 0 290 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 308 0 290 1 0 1 1 0 8 0
vmmpekpl 168 6466 0 6431 2 0 2 2 0 8 0
vmmpepl 168 45454 0 43365 122 10 112 117 0 357 20
vmsppl 368 307 0 290 2 0 2 2 0 8 0
pdppl 4096 623 0 581 6 0 6 6 0 8 0
pvpl 32 161555 0 142295 192 0 192 192 0 265 35
pmappl 232 307 0 290 2 0 2 2 0 8 1
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 172 0 3 5 0 5 5 0 8 0