uvm_fault(0xfffffd806c98fd70, 0x7f8797b67048, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
322179 89615 0 0 0 0 syz-executor
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree(fffffd800dfcef20) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffffd806cc3a970) at amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c46f040,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806c98fd70) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2530
exit1(ffff800038fe1cb0,43,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff800038fe1cb0,ffff80003c46f210,ffff80003c46f160) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c46f210) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c46f210) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x739f1f7e0c10, count: 6
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: uvm_fault(0xfffffd806c98fd70, 0x7f8797b67048, 0, 2) -> e
ddb{1}> trace
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree(fffffd800dfcef20) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffffd806cc3a970) at amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c46f040,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806c98fd70) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2530
exit1(ffff800038fe1cb0,43,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff800038fe1cb0,ffff80003c46f210,ffff80003c46f160) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c46f210) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c46f210) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x739f1f7e0c10, count: -9
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff80003c46ef40
rbx 0xfffffd806da51308
rdx 0
rcx 0x7f8000000000
rax 0
r8 0
r9 0xffff80003c46ef30
r10 0xfa3ab4a911ebf558
r11 0x1792690bacb7989c
r12 0
r13 0x800000006d3b5001
r14 0x797b67048
r15 0xfffffd8007e0e030
rip 0xffffffff82666d1d pmap_page_remove+0x45d
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff80003c46eec0
ss 0x10
pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
ddb{1}> show proc
PROC (syz-executor) tid=325571 pid=74057 tcnt=0 stat=onproc
flags process=a<EXEC,EXITING> proc=2000<WEXIT>
runpri=86, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=1
forw=0xffffffffffffffff, list=0xffff8000fffee548,0xffff800038fe0fc8
process=0xffff80003c40c4f0 user=0xffff80003c46a000, vmspace=0xfffffd806c98fd70
estcpu=36, cpticks=197, pctcpu=0.19, user=0, sys=3, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
89615 322179 58371 0 7 0 syz-executor
34071 249192 74909 0 2 0x2 ifconfig
5914 361156 73815 0 2 0 syz-executor
5914 128202 73815 0 3 0x4000080 ttyout syz-executor
5914 143735 73815 0 3 0x4000080 ttyout syz-executor
74909 8026 38274 0 3 0x10008a sigsusp sh
98035 429643 78838 0 2 0 syz-executor
98035 320410 78838 0 2 0x4000000 syz-executor
98035 344709 78838 0 3 0x4000080 fsleep syz-executor
38274 522066 77365 0 3 0x82 wait syz-executor
59566 83371 0 0 3 0x14200 acct acct
34596 395077 57800 60929 3 0x90 nanoslp syz-executor
34596 188534 57800 60929 3 0x4000090 kqsel syz-executor
34596 70169 57800 60929 3 0x4000090 fsleep syz-executor
34596 500521 57800 60929 3 0x4000090 fsleep syz-executor
22176 336068 32631 0 3 0x3000 suspend syz-executor
22176 294602 32631 0 2 0x4081000 syz-executor
32631 66749 77365 0 3 0x82 wait syz-executor
31639 309447 85924 0 3 0x82 sbwait sshd-session
73815 387267 77365 0 3 0x82 nanoslp syz-executor
78838 391991 77365 0 3 0x82 nanoslp syz-executor
28190 212740 85924 0 3 0x82 sbwait sshd-session
60719 140270 77365 0 2 0x2 syz-executor
58371 388023 77365 0 3 0x82 nanoslp syz-executor
57800 483220 77365 0 2 0x3 syz-executor
77365 37274 45651 0 2 0x2 syz-executor
45651 150667 45015 0 3 0x10008a sigsusp ksh
45015 365177 13444 0 3 0x98 kqread sshd-session
13444 209645 85924 0 3 0x92 kqread sshd-session
78553 73356 1 0 3 0x100083 ttyopn getty
85924 190596 1 0 3 0x88 kqread sshd
94019 317654 13294 74 3 0x1100092 bpf pflogd
13294 346061 1 0 3 0x80 sbwait pflogd
43021 374473 4270 73 3 0x1100090 kqread syslogd
4270 104638 1 0 3 0x100082 sbwait syslogd
88035 296859 1 0 3 0x100080 kqread resolvd
3049 440523 94923 77 3 0x100092 kqread dhcpleased
36320 289578 94923 77 3 0x100092 kqread dhcpleased
94923 95003 1 0 3 0x80 kqread dhcpleased
17165 72537 0 0 3 0x14200 bored smr
7693 316131 0 0 2 0x14200 zerothread
89238 457989 0 0 3 0x14200 aiodoned aiodoned
55244 295914 0 0 3 0x14200 syncer update
2448 127905 0 0 3 0x14200 cleaner cleaner
66491 465641 0 0 3 0x14200 reaper reaper
76383 89611 0 0 3 0x14200 pgdaemon pagedaemon
11459 75473 0 0 3 0x14200 bored viomb
25476 232448 0 0 3 0x40014200 acpi0 acpi0
15122 245140 0 0 3 0x40014200 idle1
21741 367826 0 0 3 0x14200 bored softnet1
71742 54281 0 0 3 0x14200 bored softnet0
55512 517368 0 0 3 0x14200 smrbar systqmp
74453 19892 0 0 3 0x14200 bored systq
77854 74870 0 0 3 0x14200 tmoslp softclockmp
57244 369908 0 0 3 0x40014200 tmoslp softclock
87033 371046 0 0 3 0x40014200 idle0
1 354204 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806eadde10)
#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_page_remove+0xca rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_page_remove+0xca pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#2 pmap_page_remove+0xca sys/arch/amd64/amd64/pmap.c:1974
#3 uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
#4 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
#5 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
#6 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2530
#7 exit1+0x6fc sys/kern/kern_exit.c:260
#8 sys_exit+0x1a sys/kern/kern_exit.c:-1
#9 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#9 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#10 Xsyscall+0x128
Process 34071 (ifconfig) thread 0xffff80003c3f94e0 (249192)
Process 98035 (syz-executor) thread 0xffff8000fffef4d8 (320410)
Process 22176 (syz-executor) thread 0xffff80003c3f87e8 (294602)
Process 60719 (syz-executor) thread 0xffff800038fe0fb8 (140270)
Process 55512 (systqmp) thread 0xffff8000ffffe7c8 (517368)
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11092 12092K 13946K 166960K 14863 0
pcb 17 16K 18K 166960K 693 0
rtable 200 15K 16K 166960K 988 0
pf 35 18K 83K 166960K 361 0
ifaddr 28 6K 9K 166960K 234 0
ifgroup 43 2K 2K 166960K 442 0
sysctl 4 1K 9K 166960K 22 0
counters 64 36K 38K 166960K 676 0
ioctlops 0 0K 4K 166960K 2617 0
iov 0 0K 24K 166960K 179 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1512 95K 96K 166960K 4036 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 3 5K 9K 166960K 43 0
VM map 2 1K 1K 166960K 2 0
sem 15 1K 1K 166960K 284 0
dirhash 12 2K 3K 166960K 66 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 240K 166960K 3289 0
sigio 0 0K 0K 166960K 62 0
proc 79 131K 164K 166960K 1166 0
subproc 63 3K 4K 166960K 171 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 366 0
in_multi 43 3K 7K 166960K 323 0
ether_multi 1 0K 0K 166960K 28 0
mrt 1 0K 0K 166960K 18 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 259 1155K 1155K 166960K 259 0
exec 0 0K 1K 166960K 1202 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 6 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 271 185K 207K 166960K 33238 0
UVM aobj 104 25K 27K 166960K 119 0
pinsyscall 46 92K 103K 166960K 4694 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 1K 166960K 478 0
NDP 9 0K 2K 166960K 181 0
temp 80 8688K 8784K 166960K 141014 0
kqueue 13 20K 32K 166960K 621 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 120 317 0 314 2 1 1 2 0 8 0
rtentry 176 287 0 226 6 1 5 6 0 8 0
unpcb 144 1939 0 1918 15 13 2 6 0 8 1
syncache 336 14 0 14 6 6 0 1 0 8 0
tcpqe 32 3 0 3 2 2 0 1 0 8 0
tcpcb 736 1205 0 1196 28 26 2 9 0 8 1
arp 136 49 0 35 1 0 1 1 0 8 0
inpcb 328 3789 0 3775 38 31 7 10 0 8 5
nd6 152 60 0 49 2 0 2 2 0 8 0
pkpcb 40 24 0 24 10 9 1 1 0 8 1
kcovpl 48 19 0 12 1 0 1 1 0 8 0
mppekey 1024 2 0 2 2 2 0 1 0 8 0
ppxss 1192 253 0 253 5 5 0 1 0 8 0
pppxif 1504 15 0 15 6 6 0 1 0 8 0
pfstscr 40 1 0 1 1 1 0 1 0 8 0
pffrag 232 71 0 66 1 0 1 1 0 482 0
pffrnode 88 37 0 32 1 0 1 1 0 8 0
pffrent 40 136 0 131 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
pfrktable 1344 10 0 5 1 0 1 1 0 8 0
pfanchor 1288 1 0 0 1 0 1 1 0 8 0
pftag 88 5 0 0 1 0 1 1 0 8 0
pfstitem 24 4 0 0 1 0 1 1 0 8 0
pfstkey 128 12 0 8 1 0 1 1 0 8 0
pfstate 448 7 0 5 1 0 1 1 0 8 0
pfrule 1360 19 0 11 1 0 1 1 0 8 0
rttmr 136 4 0 4 3 3 0 1 0 8 0
art_heap8 4096 5 0 0 5 0 5 5 0 8 0
art_heap4 256 1126 0 902 35 14 21 32 0 8 0
art_table 40 1131 0 902 6 1 5 6 0 8 0
art_node 32 284 0 225 1 0 1 1 0 8 0
sysvmsgpl 40 17 0 12 1 0 1 1 0 8 0
semupl 112 4 0 4 4 4 0 1 0 8 0
semapl 112 274 0 261 1 0 1 1 0 8 0
shmpl 112 102 0 12 3 0 3 3 0 8 0
dirhash 1024 53 0 36 3 0 3 3 0 8 0
dino2pl 256 7631 0 6104 96 0 96 96 0 8 0
ffsino 296 7631 0 6104 118 0 118 118 0 8 0
nchpl 144 12155 0 10427 65 0 65 65 0 8 0
rtmask 32 41 0 41 7 7 0 1 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 43824 0 43824 6 5 1 2 0 8 1
percpumem 16 353 0 306 1 0 1 1 0 8 0
vcpupl 3968 13 0 2 2 0 2 2 0 8 0
vmpool 848 14 0 3 2 0 2 2 0 8 0
pfiaddrpl 120 2 0 0 1 0 1 1 0 8 0
kstatmem 264 286 0 264 4 1 3 3 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 11 0 11 6 6 0 1 0 8 0
scxspl 216 91301 0 91301 27 25 2 8 1 8 2
plimitpl 152 1157 0 1137 1 0 1 1 0 8 0
sigapl 424 3588 0 3537 9 2 7 8 0 8 0
knotepl 120 678 0 0 20 0 20 20 0 8 0
kqueuepl 224 1488 0 1478 23 22 1 5 0 8 0
pipepl 344 470 0 442 7 4 3 6 0 8 0
fdescpl 528 3536 0 3503 3 0 3 3 0 8 0
filepl 160 25442 0 25226 37 23 14 19 0 8 0
lockfpl 104 1482 0 1479 4 3 1 3 0 8 0
lockfspl 48 575 0 572 2 1 1 2 0 8 0
sessionpl 144 43 0 32 1 0 1 1 0 8 0
pgrppl 48 137 0 118 1 0 1 1 0 8 0
ucredpl 104 4249 0 4235 1 0 1 1 0 8 0
zombiepl 144 3867 0 3865 2 1 1 1 0 8 0
processpl 1232 3588 0 3537 7 2 5 6 0 8 0
procpl 664 8915 0 8856 8 0 8 8 0 8 0
sosppl 176 18 0 18 5 5 0 1 0 8 0
sockpl 752 6170 0 6132 58 47 11 17 0 8 6
mcl64k 65536 9 0 0 2 0 2 2 0 8 0
mcl16k 16384 6 0 0 1 0 1 1 0 8 0
mcl12k 12288 3 0 0 1 0 1 1 0 8 0
mcl9k 9216 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 6 0 0 1 0 1 1 0 8 0
mcl4k 4096 119 0 0 15 0 15 15 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 55 0 0 7 0 7 7 0 8 0
mtagpl 96 4 0 0 1 0 1 1 0 8 0
mbufpl 256 1734 0 0 105 0 105 105 0 8 0
bufpl 280 39466 0 33330 439 0 439 439 0 8 0
anonpl 32 15061 0 0 122 0 122 122 0 246 0
amapchunkpl 152 112506 0 111996 74 45 29 39 0 158 4
amappl16 200 13774 0 13518 124 101 23 36 0 8 2
amappl15 192 3 0 3 1 1 0 1 0 8 0
amappl14 184 7 0 7 2 2 0 1 0 8 0
amappl13 176 562 0 560 1 0 1 1 0 8 0
amappl12 168 2842 0 2808 3 0 3 3 0 8 0
amappl11 160 20 0 20 2 2 0 1 0 8 0
amappl10 152 85 0 71 1 0 1 1 0 8 0
amappl9 144 248 0 247 1 0 1 1 0 8 0
amappl8 136 44 0 42 1 0 1 1 0 8 0
amappl7 128 121 0 118 1 0 1 1 0 8 0
amappl6 120 409 0 391 1 0 1 1 0 8 0
amappl5 112 88 0 74 1 0 1 1 0 8 0
amappl4 104 524 0 492 1 0 1 1 0 8 0
amappl3 96 19946 0 19850 6 2 4 4 0 8 0
amappl2 88 3710 0 3616 3 0 3 3 0 8 0
amappl1 80 25033 0 24278 19 1 18 18 0 8 0
amappl 88 31771 0 31594 7 1 6 6 0 92 0
uvmvnodes 80 201 0 0 5 0 5 5 0 8 0
dma65536 65536 1 0 1 1 1 0 1 0 8 0
dma16384 16384 1 0 1 1 1 0 1 0 8 0
dma4096 4096 3 0 3 3 3 0 1 0 8 0
dma2048 2048 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 128 254 0 254 2 2 0 1 0 8 0
dma64 64 12 0 12 6 6 0 1 0 8 0
dma32 32 8 0 8 2 2 0 1 0 8 0
dma16 16 18 0 17 1 0 1 1 0 8 0
aobjpl 72 118 0 15 2 0 2 2 0 8 0
uaddrrnd 24 3536 0 3503 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 3536 0 3503 1 0 1 1 0 8 0
vmmpekpl 168 26997 0 26931 4 0 4 4 0 8 0
vmmpepl 168 239532 0 237148 175 58 117 122 0 357 2
vmsppl 488 3535 0 3502 5 0 5 5 0 8 0
rwobjpl 80 63209 0 61535 53 15 38 40 0 8 0
pdppl 4096 7108 0 7021 155 66 89 89 0 8 2
pvpl 32 22868 0 0 186 2 184 184 0 265 0
pmappl 256 3549 0 3505 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 480 0 126 11 0 11 11 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff838a3ff0) 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(ffffffff83906d80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83906d80) 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
__mp_lock(ffffffff83906d80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83906d80) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a35e5f0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a35e5f0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x754159365d00, count: 5
ddb{0}> trace
x86_ipi_db(ffffffff838a3ff0) 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(ffffffff83906d80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83906d80) 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
__mp_lock(ffffffff83906d80) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff83906d80) at __mp_lock+0x192 sys/kern/kern_lock.c:173
syscall(ffff80002a35e5f0) at syscall+0xaf4 mi_syscall sys/sys/syscall_mi.h:175 [inline]
syscall(ffff80002a35e5f0) at syscall+0xaf4 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x754159365d00, count: -10
ddb{0}> machine ddbcpu 1
Stopped at pmap_page_remove+0x45d: xchgq %rax,0(%r14,%rcx,1)
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree(fffffd800dfcef20) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffffd806cc3a970) at amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c46f040,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806c98fd70) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2530
exit1(ffff800038fe1cb0,43,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff800038fe1cb0,ffff80003c46f210,ffff80003c46f160) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c46f210) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c46f210) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x739f1f7e0c10, count: 6
ddb{1}> trace
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d _atomic_swap_64 sys/arch/amd64/compile/SYZKALLER/obj/machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8007e0dfc8) at pmap_page_remove+0x45d sys/arch/amd64/amd64/pmap.c:2014
uvm_anfree(fffffd800dfcef20) at uvm_anfree+0xd8 sys/uvm/uvm_anon.c:111
amap_wipeout(fffffd806cc3a970) at amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff80003c46f040,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806c98fd70) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2530
exit1(ffff800038fe1cb0,43,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff800038fe1cb0,ffff80003c46f210,ffff80003c46f160) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80003c46f210) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80003c46f210) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x739f1f7e0c10, count: -9