panic: kernel diagnostic assertion "dupe == NULL" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 140
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*217635 12656 32767 0x10 0 1K syz-executor.1
5022 37142 32767 0x10 0 0 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821ce21b) at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff82227bd9,ffffffff821e8c1f,8c,ffffffff821b5112) at __assert+0x2b sys/kern/subr_prf.c:154
uvm_pagealloc(fffffd807effedc8,100000,0,3) at uvm_pagealloc+0x476 sys/uvm/uvm_page.c:140
pmap_get_ptp(fffffd807effed98,20000000) at pmap_get_ptp+0xe8 sys/arch/amd64/amd64/pmap.c:1175
pmap_enter(fffffd807effed98,20000000,661eb000,2,22) at pmap_enter+0x2a8
uvm_fault(fffffd807efffb80,20000000,0,2) at uvm_fault+0x1373 sys/uvm/uvm_fault.c:939
pageflttrap(ffff800024dab960,1) at pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221
usertrap(ffff800024dab960) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:384
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffcc030, count: 5
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 "dupe == NULL" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 140
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:398
panic(ffffffff821ce21b) at panic+0x15c sys/kern/subr_prf.c:207
__assert(ffffffff82227bd9,ffffffff821e8c1f,8c,ffffffff821b5112) at __assert+0x2b sys/kern/subr_prf.c:154
uvm_pagealloc(fffffd807effedc8,100000,0,3) at uvm_pagealloc+0x476 sys/uvm/uvm_page.c:140
pmap_get_ptp(fffffd807effed98,20000000) at pmap_get_ptp+0xe8 sys/arch/amd64/amd64/pmap.c:1175
pmap_enter(fffffd807effed98,20000000,661eb000,2,22) at pmap_enter+0x2a8
uvm_fault(fffffd807efffb80,20000000,0,2) at uvm_fault+0x1373 sys/uvm/uvm_fault.c:939
pageflttrap(ffff800024dab960,1) at pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221
usertrap(ffff800024dab960) at usertrap+0x21a sys/arch/amd64/amd64/trap.c:384
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7f7ffffcc030, count: -10
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800024dab350
rbx 0xffff800024dab400
rdx 0xffff800020a7dd48
rcx 0
rax 0
r8 0xffffffff81180f8f kprintf+0x16f
r9 0x1
r10 0x25
r11 0xfbedb0cb87a37b81
r12 0x3000000008
r13 0xffff800024dab360
r14 0x100
r15 0x1
rip 0xffffffff81d39998 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800024dab340
ss 0
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=217635 stat=onproc
flags process=10<SUGID> proc=0
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800020a7c758,0xffff800020a9c028
process=0xffff800020ae63e0 user=0xffff800024da6000, vmspace=0xfffffd807efffb80
estcpu=36, cpticks=4, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*12656 217635 13968 32767 7 0x10 syz-executor.1
12656 250781 13968 32767 3 0x4000090 fsleep syz-executor.1
12656 488514 13968 32767 3 0x4000090 fsleep syz-executor.1
37142 5022 80635 32767 7 0x10 syz-executor.0
37142 217271 80635 32767 3 0x4000090 kqread syz-executor.0
13968 282165 21724 32767 3 0x90 nanosleep syz-executor.1
21724 505596 17392 0 3 0x82 wait syz-executor.1
80635 271405 91294 32767 3 0x90 nanosleep syz-executor.0
91294 449328 17392 0 3 0x82 wait syz-executor.0
79685 394861 0 0 3 0x14200 bored sosplice
17392 326457 95049 0 3 0x82 thrsleep syz-fuzzer
17392 519948 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 424106 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 517421 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 279358 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 445875 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 329409 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 511683 95049 0 3 0x4000082 thrsleep syz-fuzzer
17392 472559 95049 0 3 0x4000082 kqread syz-fuzzer
17392 173342 95049 0 3 0x4000082 thrsleep syz-fuzzer
95049 467603 14388 0 3 0x10008a pause ksh
14388 68330 80720 0 3 0x92 select sshd
25929 84603 1 0 3 0x100083 ttyin getty
80720 351275 1 0 3 0x80 select sshd
24129 401472 80713 73 3 0x100090 kqread syslogd
80713 326452 1 0 3 0x100082 netio syslogd
52855 355036 1 77 3 0x100090 poll dhclient
42375 397877 1 0 3 0x80 poll dhclient
86685 141887 0 0 2 0x14200 zerothread
75061 53078 0 0 3 0x14200 aiodoned aiodoned
31021 481076 0 0 3 0x14200 syncer update
63043 83423 0 0 3 0x14200 cleaner cleaner
54225 367304 0 0 3 0x14200 reaper reaper
88010 100024 0 0 3 0x14200 pgdaemon pagedaemon
60422 361305 0 0 3 0x14200 bored crynlk
76713 251383 0 0 3 0x14200 bored crypto
9360 58022 0 0 3 0x40014200 acpi0 acpi0
26263 495395 0 0 3 0x40014200 idle1
93273 392072 0 0 3 0x14200 bored softnet
30261 106020 0 0 3 0x14200 bored systqmp
88719 252701 0 0 3 0x14200 bored systq
74677 510556 0 0 3 0x40014200 bored softclock
58671 110176 0 0 3 0x40014200 idle0
87517 303748 0 0 3 0x14200 bored smr
1 512336 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807effeda8)
#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 pmap_enter+0x1bc rcr3 machine/cpufunc.h:141 [inline]
#3 pmap_enter+0x1bc pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline]
#3 pmap_enter+0x1bc sys/arch/amd64/amd64/pmap.c:2678
#4 uvm_fault+0x1373 sys/uvm/uvm_fault.c:939
#5 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221
#6 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384
#7 recall_trap+0x8
Process 12656 (syz-executor.1) thread 0xffff800020a7dd48 (217635)
shared rwlock vmmaplk r = 0 (0xfffffd807efffb98)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 uvmfault_lookup+0xd9 sys/uvm/uvm_fault.c:1448
#2 uvm_fault+0x7f sys/uvm/uvm_fault.c:524
#3 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221
#4 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384
#5 recall_trap+0x8
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82644060)
#0 witness_lock+0x52e sys/kern/subr_witness.c:1164
#1 pageflttrap+0x7f sys/arch/amd64/amd64/trap.c:180
#2 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384
#3 recall_trap+0x8
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd807effeda8)
#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 pmap_enter+0x1bc rcr3 machine/cpufunc.h:141 [inline]
#3 pmap_enter+0x1bc pmap_map_ptes sys/arch/amd64/amd64/pmap.c:414 [inline]
#3 pmap_enter+0x1bc sys/arch/amd64/amd64/pmap.c:2678
#4 uvm_fault+0x1373 sys/uvm/uvm_fault.c:939
#5 pageflttrap+0x1b8 sys/arch/amd64/amd64/trap.c:221
#6 usertrap+0x21a sys/arch/amd64/amd64/trap.c:384
#7 recall_trap+0x8
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 9482 6334K 6334K 78643K 10870 0
pcb 13 10K 12K 78643K 15 0
rtable 107 3K 4K 78643K 3132 0
ifaddr 39 11K 11K 78643K 579 0
counters 43 33K 33K 78643K 191 0
ioctlops 0 0K 2K 78643K 164 0
iov 0 0K 28K 78643K 776 0
mount 1 1K 1K 78643K 1 0
vnodes 1215 76K 76K 78643K 3147 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 53 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 0K 78643K 1955 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1809 196K 290K 78643K 12766 0
file desc 8 25K 33K 78643K 3676 0
sigio 0 0K 0K 78643K 97 0
proc 48 50K 83K 78643K 3900 0
subproc 34 2K 2K 78643K 1292 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 1K 78643K 1005 0
in_multi 33 2K 2K 78643K 972 0
ether_multi 1 0K 0K 78643K 23 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 133 599K 599K 78643K 133 0
exec 0 0K 1K 78643K 1557 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 178 26K 42K 78643K 14496 0
UVM aobj 130 4K 4K 78643K 135 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 331 0
NDP 7 0K 0K 78643K 231 0
temp 102 3021K 3087K 78643K 17526 0
kqueue 3 4K 23K 78643K 491 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 64 161 0 154 1 0 1 1 0 8 0
plcache 128 20 0 0 1 0 1 1 0 8 0
rtpcb 80 618 0 616 1 0 1 1 0 8 0
rtentry 112 816 0 771 2 0 2 2 0 8 0
unpcb 120 4172 0 4160 13 12 1 3 0 8 0
syncache 264 61 0 61 15 14 1 1 0 8 1
tcpqe 32 59 0 59 8 7 1 1 0 8 1
tcpcb 544 3068 0 3064 39 38 1 13 0 8 0
ipq 40 34 0 34 14 13 1 1 0 8 1
ipqe 40 1205 0 1205 14 13 1 1 0 8 1
inpcb 280 6888 0 6879 40 38 2 9 0 8 1
ip6q 72 3 0 3 3 3 0 1 0 8 0
ip6af 40 4 0 4 2 2 0 1 0 8 0
nd6 48 176 0 172 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 3621 0 3406 19 5 14 15 0 8 0
art_table 32 3622 0 3406 2 0 2 2 0 8 0
art_node 16 815 0 774 1 0 1 1 0 8 0
sysvmsgpl 40 52 0 33 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 1953 0 1943 1 0 1 1 0 8 0
shmpl 112 133 0 5 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino1pl 128 5468 0 4051 46 0 46 46 0 8 0
ffsino 272 5468 0 4051 95 0 95 95 0 8 0
nchpl 144 11028 0 9427 60 0 60 60 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 63507 0 63507 1 0 1 1 0 8 1
percpumem 16 106 0 74 1 0 1 1 0 8 0
scxspl 192 33659 0 33659 27 24 3 7 0 8 3
plimitpl 152 643 0 634 1 0 1 1 0 8 0
sigapl 432 3625 0 3609 10 8 2 3 0 8 0
futexpl 56 89089 0 89087 1 0 1 1 0 8 0
knotepl 112 1607 0 1588 4 3 1 2 0 8 0
kqueuepl 104 1945 0 1942 6 5 1 4 0 8 0
pipelkpl 48 1830 0 1819 1 0 1 1 0 8 0
pipepl 120 3660 0 3639 15 13 2 3 0 8 1
fdescpl 496 3626 0 3609 3 0 3 3 0 8 0
filepl 152 46507 0 46398 42 35 7 13 0 8 2
lockfpl 104 1300 0 1298 1 0 1 1 0 8 0
lockfspl 48 359 0 357 1 0 1 1 0 8 0
sessionpl 112 91 0 81 1 0 1 1 0 8 0
pgrppl 48 190 0 180 1 0 1 1 0 8 0
ucredpl 96 8008 0 7999 1 0 1 1 0 8 0
zombiepl 144 3609 0 3609 1 0 1 1 0 8 1
processpl 960 3642 0 3609 5 0 5 5 0 8 0
procpl 624 10261 0 10216 10 6 4 5 0 8 0
sosppl 128 97 0 97 15 14 1 1 0 8 1
sockpl 400 11808 0 11786 75 69 6 17 0 8 3
mcl64k 65536 26 0 0 3 0 3 3 0 8 0
mcl16k 16384 17 0 0 3 0 3 3 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 16 0 0 2 0 2 2 0 8 0
mcl8k 8192 33 0 0 4 1 3 3 0 8 0
mcl4k 4096 17 0 0 3 0 3 3 0 8 0
mcl2k2 2112 4 0 0 1 0 1 1 0 8 0
mcl2k 2048 227 0 0 28 3 25 28 0 8 0
mtagpl 80 1 0 0 1 0 1 1 0 8 0
mbufpl 256 622 0 0 26 0 26 26 0 8 0
bufpl 280 15001 0 8711 450 0 450 450 0 8 0
anonpl 16 518966 0 506810 141 65 76 76 0 125 14
amapchunkpl 152 41469 0 41331 128 108 20 20 0 158 13
amappl16 192 18602 0 17812 173 125 48 53 0 8 8
amappl15 184 1175 0 1172 1 0 1 1 0 8 0
amappl14 176 720 0 716 1 0 1 1 0 8 0
amappl13 168 394 0 389 9 8 1 1 0 8 0
amappl12 160 318 0 315 2 1 1 1 0 8 0
amappl11 152 406 0 395 1 0 1 1 0 8 0
amappl10 144 533 0 527 1 0 1 1 0 8 0
amappl9 136 1804 0 1793 1 0 1 1 0 8 0
amappl8 128 1070 0 993 3 0 3 3 0 8 0
amappl7 120 1015 0 999 1 0 1 1 0 8 0
amappl6 112 272 0 257 1 0 1 1 0 8 0
amappl5 104 1077 0 1068 1 0 1 1 0 8 0
amappl4 96 4143 0 4110 1 0 1 1 0 8 0
amappl3 88 500 0 493 1 0 1 1 0 8 0
amappl2 80 23346 0 23265 3 1 2 3 0 8 0
amappl1 72 108890 0 108413 24 14 10 20 0 8 0
amappl 80 11855 0 11804 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 64 134 0 5 3 0 3 3 0 8 0
uaddrrnd 24 3626 0 3609 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 3626 0 3609 1 0 1 1 0 8 0
vmmpekpl 168 38449 0 38419 2 0 2 2 0 8 0
vmmpepl 168 512510 0 510280 196 74 122 126 0 357 23
vmsppl 368 3625 0 3609 2 0 2 2 0 8 0
pdppl 4096 7259 0 7218 6 0 6 6 0 8 0
pvpl 32 1350631 0 1335118 305 124 181 183 0 265 29
pmappl 232 3625 0 3609 13 12 1 2 0 8 0
extentpl 40 46 0 29 1 0 1 1 0 8 0
phpool 112 320 0 124 6 0 6 6 0 8 0