panic: pmap_enter: PG_PVLIST mapping with unmanaged page: va 0x56b42a16000, opte 0xffffffffffffffff, pa 0x6d7ba000
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*484088 55942 0 0x2 0 1 syz-executor
16062 39433 0 0x14000 0x200 0 zerothread
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8341a4ca) at panic+0x1e5 sys/kern/subr_prf.c:198
pmap_enter(fffffd806c5e9a00,56b42a16000,6d7ba000,1,21) at pmap_enter+0xf9f
uvm_fault_lower(ffff80003c44f460,ffff80003c44f498,ffff80003c44f3e0) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504
uvm_fault(fffffd8061031028,56b42a16000,0,1) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80003c44f600,56b42a16e86) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003c44f600) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7562cd900960, count: 7
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
*cpu1: pmap_enter: PG_PVLIST mapping with unmanaged page: va 0x56b42a16000, opte 0xffffffffffffffff, pa 0x6d7ba000
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8341a4ca) at panic+0x1e5 sys/kern/subr_prf.c:198
pmap_enter(fffffd806c5e9a00,56b42a16000,6d7ba000,1,21) at pmap_enter+0xf9f
uvm_fault_lower(ffff80003c44f460,ffff80003c44f498,ffff80003c44f3e0) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504
uvm_fault(fffffd8061031028,56b42a16000,0,1) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80003c44f600,56b42a16e86) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003c44f600) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7562cd900960, count: -8
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80003c44f100
rbx 0xffff8000299bee07
rdx 0
rcx 0xffff80003c434fb8
rax 0xffff8000299bdff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x52bcd3f410401100
r11 0xf8cf6b3289a7e2d3
r12 0xffff8000299bec08
r13 0
r14 0
r15 0x1
rip 0xffffffff82580275 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff80003c44f0f0
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=484088 pid=55942 tcnt=1 stat=onproc
flags process=2<EXEC> proc=0
runpri=50, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80003c434558,0xffff80002a28fcb0
process=0xffff80002a3a0e88 user=0xffff80003c44a000, vmspace=0xfffffd8061031028
estcpu=36, cpticks=31, pctcpu=0.16, user=2, sys=29, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
16091 13447 39624 0 2 0x100000 sh
21307 199457 96455 0 2 0 syz-executor
21307 300464 96455 0 3 0x4000080 fsleep syz-executor
39624 6634 73073 0 3 0x10008a sigsusp sh
16066 229094 35015 0 3 0x80 nanoslp syz-executor
16066 152770 35015 0 3 0x4000080 ttyout syz-executor
16066 314169 35015 0 3 0x4000080 fsleep syz-executor
16066 132822 35015 0 3 0x4000080 fsleep syz-executor
73073 396685 58640 0 3 0x82 wait syz-executor
32337 165743 39441 60929 3 0x90 nanoslp syz-executor
32337 359543 39441 60929 3 0x4000090 fsleep syz-executor
32337 76387 39441 60929 3 0x4000090 fsleep syz-executor
39441 451385 58640 0 3 0x82 nanoslp syz-executor
11460 142392 1 0 3 0x100083 ttyin getty
57576 100103 0 0 3 0x14200 acct acct
*55942 484088 58640 0 7 0x2 syz-executor
59627 443867 58640 0 3 0x82 piperd syz-executor
88310 303166 0 0 3 0x14280 nfsidl nfsio
3303 82679 0 0 3 0x14280 nfsidl nfsio
3982 382911 0 0 3 0x14280 nfsidl nfsio
61819 64991 0 0 3 0x14280 nfsidl nfsio
35015 103263 58640 0 3 0x82 nanoslp syz-executor
84284 344647 58640 0 3 0x82 piperd syz-executor
61273 176431 58640 0 3 0x82 wait syz-executor
96455 499143 58640 0 3 0x82 nanoslp syz-executor
58640 252355 42102 0 2 0x3 syz-executor
42102 368427 46737 0 3 0x10008a sigsusp ksh
46737 214011 92765 0 3 0x98 kqread sshd-session
92765 224006 88507 0 3 0x92 kqread sshd-session
88507 119799 1 0 3 0x88 kqread sshd
41818 373541 65870 74 3 0x1100092 bpf pflogd
65870 368920 1 0 3 0x80 sbwait pflogd
41524 371124 93363 73 3 0x1100090 kqread syslogd
93363 438739 1 0 3 0x100082 sbwait syslogd
56651 115146 1 0 3 0x100080 kqread resolvd
94897 390186 16672 77 3 0x100092 kqread dhcpleased
44768 442191 16672 77 3 0x100092 kqread dhcpleased
16672 340005 1 0 3 0x80 kqread dhcpleased
12775 440304 0 0 3 0x14200 bored smr
39433 16062 0 0 7 0x14200 zerothread
42321 158819 0 0 3 0x14200 aiodoned aiodoned
30701 327189 0 0 3 0x14200 syncer update
51073 143691 0 0 3 0x14200 cleaner cleaner
26519 51990 0 0 3 0x14200 reaper reaper
57478 363668 0 0 3 0x14200 pgdaemon pagedaemon
85696 75936 0 0 3 0x14200 bored viomb
9778 145557 0 0 3 0x40014200 acpi0 acpi0
41910 33890 0 0 3 0x40014200 idle1
96615 142513 0 0 3 0x14200 bored softnet1
72637 490318 0 0 3 0x14200 bored softnet0
44099 394758 0 0 3 0x14200 bored systqmp
39908 512389 0 0 3 0x14200 bored systq
56853 131577 0 0 3 0x14200 tmoslp softclockmp
69444 13915 0 0 3 0x40014200 tmoslp softclock
61823 55067 0 0 3 0x40014200 idle0
1 508324 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c5e9a10)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767
#3 uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
Process 55942 (syz-executor) thread 0xffff80003c434fb8 (484088)
shared rwlock uobjlk r = 0 (0xfffffd806db09040)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvm_fault_lower_lookup+0x53 sys/uvm/uvm_fault.c:1204
#3 uvm_fault_lower+0x89 sys/uvm/uvm_fault.c:1334
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffffd8061031128)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806c5e9a10)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 mtx_enter+0x4b4 sys/kern/kern_lock.c:487
#2 pmap_enter+0x24b rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_enter+0x24b pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#2 pmap_enter+0x24b sys/arch/amd64/amd64/pmap.c:2767
#3 uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504
#4 uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
#7 recall_trap+0x8
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11093 12174K 12358K 166960K 12929 0
pcb 17 16K 17K 166960K 498 0
rtable 219 10K 10K 166960K 566 0
pf 32 17K 82K 166960K 228 0
ifaddr 38 6K 8K 166960K 117 0
ifgroup 46 2K 2K 166960K 205 0
sysctl 4 1K 9K 166960K 14 0
counters 70 36K 38K 166960K 198 0
ioctlops 0 0K 4K 166960K 1724 0
iov 0 0K 16K 166960K 69 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1347 85K 86K 166960K 2170 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 17 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 47 0
dirhash 12 2K 2K 166960K 27 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 240K 166960K 1179 0
sigio 0 0K 0K 166960K 19 0
proc 72 115K 180K 166960K 716 0
subproc 72 4K 4K 166960K 108 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 118 0
in_multi 83 5K 7K 166960K 182 0
ether_multi 1 0K 0K 166960K 11 0
mrt 1 0K 0K 166960K 29 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 253 1129K 1129K 166960K 253 0
exec 0 0K 1K 166960K 588 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 226 168K 186K 166960K 12736 0
UVM aobj 31 14K 14K 166960K 35 0
pinsyscall 41 82K 100K 166960K 2424 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 82 0
NDP 11 0K 2K 166960K 80 0
temp 81 9088K 9203K 166960K 54940 0
kqueue 14 22K 29K 166960K 204 0
SYN cache 2 16K 16K 166960K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 26 0 0 1 0 1 1 0 8 0
rtpcb 120 236 0 233 4 3 1 4 0 8 0
rtentry 176 174 0 87 6 0 6 6 0 8 0
unpcb 144 776 0 756 6 4 2 6 0 8 1
syncache 336 10 0 10 3 2 1 1 0 8 1
tcpqe 32 2 0 2 2 2 0 1 0 8 0
tcpcb 736 371 0 364 7 6 1 7 0 8 0
arp 136 24 0 10 1 0 1 1 0 8 0
inpcb 328 1487 0 1477 18 11 7 8 0 8 5
nd6 152 37 0 15 1 0 1 1 0 8 0
pkpcb 40 9 0 9 2 1 1 1 0 8 1
kcovpl 48 12 0 4 1 0 1 1 0 8 0
ppxss 1192 42 0 40 2 1 1 1 0 8 0
pppxif 1504 8 0 8 3 2 1 1 0 8 1
pffrag 232 6 0 2 1 0 1 1 0 482 0
pffrnode 88 6 0 2 1 0 1 1 0 8 0
pffrent 40 11 0 7 1 0 1 1 0 8 0
pfosfp 40 1428 0 1005 5 0 5 5 0 8 0
pfosfpen 112 1428 0 714 21 0 21 21 0 8 0
pfsrclim 320 4 0 4 2 1 1 1 0 8 1
pfstitem 24 75 0 22 1 0 1 1 0 8 0
pfstkey 128 75 0 22 2 0 2 2 0 8 0
pfstate 448 74 0 22 7 0 7 7 0 8 0
pfrule 1360 24 0 19 2 1 1 2 0 8 0
rttmr 136 3 0 3 2 1 1 1 0 8 1
art_heap8 4096 4 0 0 4 0 4 4 0 8 0
art_heap4 256 741 0 366 33 7 26 30 0 8 0
art_table 40 745 0 366 5 0 5 5 0 8 0
art_node 32 172 0 94 1 0 1 1 0 8 0
sysvmsgpl 40 10 0 7 2 1 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 44 0 34 1 0 1 1 0 8 0
shmpl 112 25 0 3 1 0 1 1 0 8 0
dirhash 1024 27 0 10 3 0 3 3 0 8 0
dino2pl 256 3600 0 2141 93 0 93 93 0 8 0
ffsino 296 3600 0 2141 114 0 114 114 0 8 0
nchpl 144 5155 0 3447 64 0 64 64 0 8 0
rtmask 32 8 0 8 2 2 0 1 0 8 0
vnodes 216 4019 0 0 224 0 224 224 0 8 0
namei 1024 17612 0 17612 5 4 1 2 0 8 1
percpumem 16 114 0 64 1 0 1 1 0 8 0
vcpupl 3968 7 0 1 1 0 1 1 0 8 0
vmpool 848 7 0 1 1 0 1 1 0 8 0
kstatmem 264 116 0 92 3 1 2 3 0 8 0
scsiplug 72 3 0 3 2 2 0 1 0 8 0
scxspl 216 27972 0 27972 11 10 1 8 1 8 1
plimitpl 152 374 0 356 1 0 1 1 0 8 0
sigapl 424 1473 0 1422 8 1 7 7 0 8 0
knotepl 120 534 0 0 17 0 17 17 0 8 0
kqueuepl 224 436 0 423 7 5 2 5 0 8 1
pipepl 344 211 0 184 4 1 3 4 0 8 0
fdescpl 528 1452 0 1422 3 0 3 3 0 8 0
filepl 160 9258 0 9033 31 18 13 21 0 8 2
lockfpl 104 611 0 608 2 1 1 2 0 8 0
lockfspl 48 164 0 161 1 0 1 1 0 8 0
sessionpl 144 32 0 23 1 0 1 1 0 8 0
pgrppl 48 58 0 41 1 0 1 1 0 8 0
ucredpl 104 1513 0 1499 1 0 1 1 0 8 0
zombiepl 144 1643 0 1642 1 0 1 1 0 8 0
processpl 1232 1473 0 1422 5 0 5 5 0 8 0
procpl 664 3227 0 3170 7 1 6 7 0 8 0
sosppl 176 4 0 4 2 2 0 1 0 8 0
sockpl 752 2541 0 2508 43 32 11 29 0 8 6
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl9k 9216 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 22 0 0 3 0 3 3 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 2870 0 0 179 0 179 179 0 8 0
bufpl 280 10423 0 4293 439 0 439 439 0 8 0
anonpl 32 10693 0 0 87 0 87 87 0 246 0
amapchunkpl 152 42211 0 41754 42 12 30 36 0 158 4
amappl16 200 4841 0 4811 27 20 7 24 0 8 0
amappl15 192 4 0 4 1 1 0 1 0 8 0
amappl14 184 465 0 463 1 0 1 1 0 8 0
amappl13 176 140 0 128 1 0 1 1 0 8 0
amappl12 168 1718 0 1689 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 1 0 1 0 8 0
amappl10 152 63 0 49 1 0 1 1 0 8 0
amappl9 144 267 0 267 1 1 0 1 0 8 0
amappl8 136 119 0 116 1 0 1 1 0 8 0
amappl7 128 163 0 150 1 0 1 1 0 8 0
amappl6 120 191 0 188 1 0 1 1 0 8 0
amappl5 112 147 0 137 1 0 1 1 0 8 0
amappl4 104 331 0 309 1 0 1 1 0 8 0
amappl3 96 8343 0 8244 4 0 4 4 0 8 0
amappl2 88 626 0 563 2 0 2 2 0 8 0
amappl1 80 16033 0 15437 20 4 16 17 0 8 2
amappl 88 11728 0 11575 5 0 5 5 0 92 0
uvmvnodes 80 136 0 0 3 0 3 3 0 8 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 7 0 7 2 2 0 1 0 8 0
dma128 128 255 0 255 2 2 0 1 0 8 0
dma64 64 7 0 7 2 2 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 34 0 4 1 0 1 1 0 8 0
uaddrrnd 24 1452 0 1422 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 1452 0 1422 1 0 1 1 0 8 0
vmmpekpl 168 13947 0 13901 3 0 3 3 0 8 0
vmmpepl 168 101175 0 99353 127 27 100 106 0 357 9
vmsppl 488 1451 0 1422 6 1 5 5 0 8 0
rwobjpl 80 30196 0 29101 33 4 29 31 0 8 0
pdppl 4096 2925 0 2852 115 38 77 85 0 8 4
pvpl 32 18420 0 0 149 0 149 149 0 265 0
pmappl 256 1458 0 1423 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 479 0 61 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff8389dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff83ab5e00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83ab5e00) at __mp_lock+0x192 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
pagezero() at pagezero+0x27
end trace frame: 0x0, count: 7
ddb{0}> trace
x86_ipi_db(ffffffff8389dff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff83ab5e00) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83ab5e00) at __mp_lock+0x192 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
pagezero() at pagezero+0x27
end trace frame: 0x0, count: -8
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x25: addq $0x8,%rsp
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8341a4ca) at panic+0x1e5 sys/kern/subr_prf.c:198
pmap_enter(fffffd806c5e9a00,56b42a16000,6d7ba000,1,21) at pmap_enter+0xf9f
uvm_fault_lower(ffff80003c44f460,ffff80003c44f498,ffff80003c44f3e0) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504
uvm_fault(fffffd8061031028,56b42a16000,0,1) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80003c44f600,56b42a16e86) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003c44f600) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7562cd900960, count: 7
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
panic(ffffffff8341a4ca) at panic+0x1e5 sys/kern/subr_prf.c:198
pmap_enter(fffffd806c5e9a00,56b42a16000,6d7ba000,1,21) at pmap_enter+0xf9f
uvm_fault_lower(ffff80003c44f460,ffff80003c44f498,ffff80003c44f3e0) at uvm_fault_lower+0x5d6 sys/uvm/uvm_fault.c:1504
uvm_fault(fffffd8061031028,56b42a16000,0,1) at uvm_fault+0x274 sys/uvm/uvm_fault.c:-1
upageflttrap(ffff80003c44f600,56b42a16e86) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:192
usertrap(ffff80003c44f600) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:640
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x7562cd900960, count: -8