uvm_fault: pmap_page_remove (3)
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syzbot
Feb 11, 2022, 3:14:19 AM2/11/22
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 53baf8a7cf63 Lock the pkg db while running
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=10dc8174700000
kernel config: https://syzkaller.appspot.com/x/.config?x=fe55924c11e64b0a
dashboard link: https://syzkaller.appspot.com/bug?extid=20b2695570939c4acf15
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20b269...@syzkaller.appspotmail.com
uvm_fault(0xffffffff82a6df90, 0x7f843f93e530, 0, 2) -> e
kernel: page fault trap, code=0
Stopped at pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*347058 85728 0 0x14000 0x200 0 reaper
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: 8
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff82a6df90, 0x7f843f93e530, 0, 2) -> e
ddb> trace
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -7
ddb> show registers
rdi 0
rsi 0
rbp 0xffff8000215be950
rbx 0
rdx 0
rcx 0x7f8000000000
rax 0
r8 0
r9 0
r10 0x6cd36b6a9ad3bfc1
r11 0x17413fca9e591f5d
r12 0
r13 0xfffffd806bb91f28
r14 0x800000007f7cf000
r15 0x43f93e530
rip 0xffffffff813b220d pmap_page_remove+0x30d
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff8000215be8c0
ss 0x10
pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1)
ddb> show proc
PROC (reaper) pid=347058 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
pri=4, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffffed20,0xffff8000fffff7b0
process=0xffff8000ffffa7d8 user=0xffff8000215b9000, vmspace=0xffffffff82a6df90
estcpu=1, cpticks=1, pctcpu=0.30
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
54065 246597 50263 0 2 0 syz-executor.3
21435 260756 38311 0 2 0 syz-executor.0
38148 488521 72335 0 2 0 syz-executor.6
67638 185672 5614 0 2 0 syz-executor.2
67638 325523 5614 0 3 0x4000080 fsleep syz-executor.2
50263 362171 58242 0 3 0x82 nanoslp syz-executor.3
31205 297474 58242 0 2 0x2 syz-executor.1
55334 164905 58242 0 3 0x82 nanoslp syz-executor.5
23598 137653 58242 0 3 0x82 nanoslp syz-executor.7
58028 432196 58242 0 3 0x2 biowait syz-executor.4
72335 228903 58242 0 3 0x82 nanoslp syz-executor.6
38311 129382 58242 0 3 0x82 nanoslp syz-executor.0
51644 183885 0 0 3 0x14200 bored sosplice
5614 385293 58242 0 3 0x82 nanoslp syz-executor.2
58242 307334 44865 0 3 0x82 thrsleep syz-fuzzer
58242 503666 44865 0 3 0x4000082 nanoslp syz-fuzzer
58242 373428 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 192520 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 421645 44865 0 3 0x4000082 kqread syz-fuzzer
58242 490348 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 32054 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 7117 44865 0 3 0x4000082 thrsleep syz-fuzzer
44865 77621 42740 0 3 0x10008a sigsusp ksh
42740 273736 86312 0 3 0x9a kqread sshd
6815 125664 1 0 3 0x100083 ttyin getty
86312 126519 1 0 3 0x88 kqread sshd
83184 380203 82809 73 3 0x100090 kqread syslogd
82809 141427 1 0 3 0x100082 netio syslogd
71804 454010 1 0 3 0x100080 kqread resolvd
57866 487643 88042 77 3 0x100092 kqread dhcpleased
6263 162410 88042 77 3 0x100092 kqread dhcpleased
88042 56894 1 0 3 0x80 kqread dhcpleased
43030 383125 0 0 3 0x14200 bored smr
96013 462008 0 0 2 0x14200 zerothread
65044 59942 0 0 3 0x14200 aiodoned aiodoned
88320 130149 0 0 3 0x14200 syncer update
54521 187784 0 0 3 0x14200 cleaner cleaner
*85728 347058 0 0 7 0x14200 reaper
92628 385272 0 0 3 0x14200 pgdaemon pagedaemon
41502 312426 0 0 3 0x14200 bored viomb
8346 334393 0 0 3 0x40014200 acpi0 acpi0
51055 333003 0 0 3 0x14200 bored softnet
7078 96165 0 0 3 0x14200 bored systqmp
56671 332307 0 0 3 0x14200 bored systq
61481 500852 0 0 3 0x40014200 bored softclock
23436 25184 0 0 3 0x40014200 idle0
1 285162 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10173 6434K 7071K 78643K 18885 0
pcb 13 8K 9K 78643K 348 0
rtable 218 7K 10K 78643K 1027 0
ifaddr 78 16K 17K 78643K 319 0
sysctl 2 0K 0K 78643K 2 0
counters 26 17K 17K 78643K 60 0
ioctlops 0 0K 4K 78643K 659 0
iov 0 0K 16K 78643K 142 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1330 83K 83K 78643K 4079 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 36 0
VM map 2 0K 0K 78643K 2 0
sem 10 0K 1K 78643K 16 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 14 49K 89K 78643K 7972 0
sigio 0 0K 0K 78643K 32 0
proc 69 55K 87K 78643K 945 0
subproc 104 6K 6K 78643K 286 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 239 0
in_multi 87 5K 6K 78643K 375 0
ether_multi 1 0K 0K 78643K 58 0
mrt 1 0K 0K 78643K 70 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 79 360K 360K 78643K 79 0
exec 0 0K 2K 78643K 1088 0
pfkey data 0 0K 0K 78643K 1 0
tdb 3 0K 0K 78643K 3 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 346 263K 329K 78643K 94779 0
UVM aobj 32 2K 2K 78643K 32 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 211 0
NDP 11 0K 2K 78643K 89 0
temp 126 4697K 4767K 78643K 30209 0
kqueue 12 18K 24K 78643K 261 0
SYN cache 2 16K 16K 78643K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 116 0 113 1 0 1 1 0 8 0
rtentry 112 306 0 210 4 0 4 4 0 8 0
unpcb 136 1578 0 1565 8 7 1 5 0 8 0
syncache 296 33 0 33 8 8 0 1 0 8 0
tcpqe 32 17 0 17 6 6 0 1 0 8 0
tcpcb 736 817 0 813 26 25 1 7 0 8 0
arp 88 47 0 33 1 0 1 1 0 8 0
ipq 40 9 0 9 3 3 0 1 0 8 0
ipqe 40 313 0 313 3 3 0 1 0 8 0
inpcb 304 2111 0 2104 22 21 1 6 0 8 0
rttmr 72 19 0 19 1 1 0 1 0 8 0
ip6q 72 1 0 1 1 1 0 1 0 8 0
ip6af 40 1 0 1 1 1 0 1 0 8 0
nd6 48 68 0 46 1 0 1 1 0 8 0
pkpcb 40 36 0 36 4 4 0 1 0 8 0
kcovpl 48 22 0 14 1 0 1 1 0 8 0
ppxss 1152 13 0 13 4 4 0 1 0 8 0
pfstscr 40 13 0 13 1 1 0 1 0 8 0
pffrag 232 27 0 7 2 0 2 2 0 482 0
pffrnode 88 16 0 7 1 0 1 1 0 8 0
pffrent 40 166 0 146 1 0 1 1 0 8 0
pfosfp 40 1 0 0 1 0 1 1 0 8 0
pfosfpen 112 1 0 0 1 0 1 1 0 8 0
pfrktable 1344 29 0 29 1 1 0 1 0 8 0
pftag 88 5 0 2 1 0 1 1 0 8 0
pfstitem 24 20 0 20 1 1 0 1 0 8 0
pfstkey 112 28 0 28 1 1 0 1 0 8 0
pfstate 320 14 0 14 1 1 0 1 0 8 0
pfrule 1360 59 0 53 3 2 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 1107 0 695 35 9 26 29 0 8 0
art_table 32 1108 0 695 4 0 4 4 0 8 0
art_node 16 299 0 212 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0
semapl 112 8 0 0 1 0 1 1 0 8 0
shmpl 112 29 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 10665 0 9234 91 0 91 91 0 8 0
ffsino 240 10665 0 9234 86 0 86 86 0 8 0
nchpl 144 19558 0 17941 62 0 62 62 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 54075 0 54073 7 6 1 2 0 8 0
vcpupl 1984 15 0 4 2 0 2 2 0 8 0
vmpool 528 16 0 5 2 1 1 2 0 8 0
pfiaddrpl 120 8 0 8 1 1 0 1 0 8 0
scsiplug 72 6 0 6 1 1 0 1 0 8 0
scxspl 216 63925 0 63924 14 12 2 8 0 8 1
plimitpl 152 158 0 144 1 0 1 1 0 8 0
sigapl 424 8233 0 8194 6 1 5 6 0 8 0
futexpl 64 44235 0 44234 6 5 1 1 0 8 0
knotepl 120 65895 0 65815 6 3 3 4 0 8 0
kqueuepl 184 453 0 445 1 0 1 1 0 8 0
pipepl 304 427 0 399 3 0 3 3 0 8 0
fdescpl 432 8219 0 8194 4 0 4 4 0 8 0
filepl 120 24852 0 24617 27 16 11 12 0 8 3
lockfpl 104 599 0 597 1 0 1 1 0 8 0
lockfspl 48 190 0 188 1 0 1 1 0 8 0
sessionpl 144 37 0 21 1 0 1 1 0 8 0
pgrppl 48 61 0 45 1 0 1 1 0 8 0
ucredpl 96 5267 0 5257 1 0 1 1 0 8 0
zombiepl 144 8194 0 8192 1 0 1 1 0 8 0
processpl 1000 8233 0 8192 7 1 6 7 0 8 0
procpl 672 17132 0 17083 16 10 6 6 0 8 1
sosppl 168 64 0 64 8 8 0 1 0 8 0
sockpl 448 3843 0 3820 41 36 5 17 0 8 2
mcl64k 65536 159 0 159 9 8 1 2 0 8 1
mcl16k 16384 81 0 81 12 11 1 1 0 8 1
mcl12k 12288 103 0 103 11 10 1 1 0 8 1
mcl9k 9216 63 0 63 9 8 1 1 0 8 1
mcl8k 8192 349 0 349 12 11 1 1 0 8 1
mcl4k 4096 261 0 261 14 13 1 1 0 8 1
mcl2k2 2112 14 0 14 6 6 0 1 0 8 0
mcl2k 2048 31621 0 31544 44 32 12 14 0 8 0
mtagpl 96 1020 0 514 15 2 13 13 0 8 0
mbufpl 256 117060 0 116337 94 46 48 68 0 8 1
bufpl 288 14053 0 7645 458 0 458 458 0 8 0
anonpl 24 2083807 0 2074166 162 90 72 110 0 188 0
amapchunkpl 152 224570 0 224027 76 49 27 46 0 158 2
amappl16 200 18502 0 18239 86 71 15 32 0 8 0
amappl15 192 1656 0 1651 1 0 1 1 0 8 0
amappl14 184 1294 0 1290 1 0 1 1 0 8 0
amappl13 176 2086 0 2082 1 0 1 1 0 8 0
amappl12 168 1025 0 1021 1 0 1 1 0 8 0
amappl11 160 1342 0 1329 1 0 1 1 0 8 0
amappl10 152 1003 0 995 1 0 1 1 0 8 0
amappl9 144 796 0 791 1 0 1 1 0 8 0
amappl8 136 1681 0 1562 5 0 5 5 0 8 0
amappl7 128 794 0 784 1 0 1 1 0 8 0
amappl6 120 569 0 543 2 1 1 2 0 8 0
amappl5 112 6254 0 6241 1 0 1 1 0 8 0
amappl4 104 4480 0 4449 2 0 2 2 0 8 0
amappl3 96 2273 0 2259 1 0 1 1 0 8 0
amappl2 88 3022 0 2966 3 1 2 3 0 8 0
amappl1 80 138208 0 137698 27 14 13 18 0 8 1
amappl 88 93816 0 93617 6 0 6 6 0 92 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 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 72 31 0 0 1 0 1 1 0 8 0
uaddrrnd 24 8235 0 8199 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 8235 0 8199 1 0 1 1 0 8 0
vmmpekpl 168 45270 0 45226 3 0 3 3 0 8 0
vmmpepl 168 710884 0 708820 179 74 105 113 0 357 6
vmsppl 272 8234 0 8198 4 1 3 3 0 8 0
rwobjpl 24 163275 0 156106 47 2 45 46 0 8 0
pdppl 4096 16476 0 16407 346 271 75 79 0 8 6
pvpl 32 3726825 0 3713253 405 278 127 257 0 265 0
pmappl 216 8234 0 8198 3 0 3 3 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 1289 0 473 25 0 25 25 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -7
ddb> machine ddbcpu 1
No such command
ddb> trace
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -7
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 53baf8a7cf63 Lock the pkg db while running
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=10dc8174700000
kernel config: https://syzkaller.appspot.com/x/.config?x=fe55924c11e64b0a
dashboard link: https://syzkaller.appspot.com/bug?extid=20b2695570939c4acf15
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+20b269...@syzkaller.appspotmail.com
uvm_fault(0xffffffff82a6df90, 0x7f843f93e530, 0, 2) -> e
kernel: page fault trap, code=0
Stopped at pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*347058 85728 0 0x14000 0x200 0 reaper
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: 8
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>
ddb> set $lines = 0
ddb> set $maxwidth = 0
ddb> show panic
*cpu0: uvm_fault(0xffffffff82a6df90, 0x7f843f93e530, 0, 2) -> e
ddb> trace
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -7
ddb> show registers
rdi 0
rsi 0
rbp 0xffff8000215be950
rbx 0
rdx 0
rcx 0x7f8000000000
rax 0
r8 0
r9 0
r10 0x6cd36b6a9ad3bfc1
r11 0x17413fca9e591f5d
r12 0
r13 0xfffffd806bb91f28
r14 0x800000007f7cf000
r15 0x43f93e530
rip 0xffffffff813b220d pmap_page_remove+0x30d
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff8000215be8c0
ss 0x10
pmap_page_remove+0x30d: xchgq %rax,0(%r15,%rcx,1)
ddb> show proc
PROC (reaper) pid=347058 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
pri=4, usrpri=51, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffffed20,0xffff8000fffff7b0
process=0xffff8000ffffa7d8 user=0xffff8000215b9000, vmspace=0xffffffff82a6df90
estcpu=1, cpticks=1, pctcpu=0.30
user=0, sys=1, intr=0
ddb> ps
PID TID PPID UID S FLAGS WAIT COMMAND
54065 246597 50263 0 2 0 syz-executor.3
21435 260756 38311 0 2 0 syz-executor.0
38148 488521 72335 0 2 0 syz-executor.6
67638 185672 5614 0 2 0 syz-executor.2
67638 325523 5614 0 3 0x4000080 fsleep syz-executor.2
50263 362171 58242 0 3 0x82 nanoslp syz-executor.3
31205 297474 58242 0 2 0x2 syz-executor.1
55334 164905 58242 0 3 0x82 nanoslp syz-executor.5
23598 137653 58242 0 3 0x82 nanoslp syz-executor.7
58028 432196 58242 0 3 0x2 biowait syz-executor.4
72335 228903 58242 0 3 0x82 nanoslp syz-executor.6
38311 129382 58242 0 3 0x82 nanoslp syz-executor.0
51644 183885 0 0 3 0x14200 bored sosplice
5614 385293 58242 0 3 0x82 nanoslp syz-executor.2
58242 307334 44865 0 3 0x82 thrsleep syz-fuzzer
58242 503666 44865 0 3 0x4000082 nanoslp syz-fuzzer
58242 373428 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 192520 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 421645 44865 0 3 0x4000082 kqread syz-fuzzer
58242 490348 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 32054 44865 0 3 0x4000082 thrsleep syz-fuzzer
58242 7117 44865 0 3 0x4000082 thrsleep syz-fuzzer
44865 77621 42740 0 3 0x10008a sigsusp ksh
42740 273736 86312 0 3 0x9a kqread sshd
6815 125664 1 0 3 0x100083 ttyin getty
86312 126519 1 0 3 0x88 kqread sshd
83184 380203 82809 73 3 0x100090 kqread syslogd
82809 141427 1 0 3 0x100082 netio syslogd
71804 454010 1 0 3 0x100080 kqread resolvd
57866 487643 88042 77 3 0x100092 kqread dhcpleased
6263 162410 88042 77 3 0x100092 kqread dhcpleased
88042 56894 1 0 3 0x80 kqread dhcpleased
43030 383125 0 0 3 0x14200 bored smr
96013 462008 0 0 2 0x14200 zerothread
65044 59942 0 0 3 0x14200 aiodoned aiodoned
88320 130149 0 0 3 0x14200 syncer update
54521 187784 0 0 3 0x14200 cleaner cleaner
*85728 347058 0 0 7 0x14200 reaper
92628 385272 0 0 3 0x14200 pgdaemon pagedaemon
41502 312426 0 0 3 0x14200 bored viomb
8346 334393 0 0 3 0x40014200 acpi0 acpi0
51055 333003 0 0 3 0x14200 bored softnet
7078 96165 0 0 3 0x14200 bored systqmp
56671 332307 0 0 3 0x14200 bored systq
61481 500852 0 0 3 0x40014200 bored softclock
23436 25184 0 0 3 0x40014200 idle0
1 285162 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb> show all locks
No such command
ddb> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10173 6434K 7071K 78643K 18885 0
pcb 13 8K 9K 78643K 348 0
rtable 218 7K 10K 78643K 1027 0
ifaddr 78 16K 17K 78643K 319 0
sysctl 2 0K 0K 78643K 2 0
counters 26 17K 17K 78643K 60 0
ioctlops 0 0K 4K 78643K 659 0
iov 0 0K 16K 78643K 142 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1330 83K 83K 78643K 4079 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 36 0
VM map 2 0K 0K 78643K 2 0
sem 10 0K 1K 78643K 16 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 14 49K 89K 78643K 7972 0
sigio 0 0K 0K 78643K 32 0
proc 69 55K 87K 78643K 945 0
subproc 104 6K 6K 78643K 286 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 239 0
in_multi 87 5K 6K 78643K 375 0
ether_multi 1 0K 0K 78643K 58 0
mrt 1 0K 0K 78643K 70 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 79 360K 360K 78643K 79 0
exec 0 0K 2K 78643K 1088 0
pfkey data 0 0K 0K 78643K 1 0
tdb 3 0K 0K 78643K 3 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 346 263K 329K 78643K 94779 0
UVM aobj 32 2K 2K 78643K 32 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 211 0
NDP 11 0K 2K 78643K 89 0
temp 126 4697K 4767K 78643K 30209 0
kqueue 12 18K 24K 78643K 261 0
SYN cache 2 16K 16K 78643K 2 0
ddb> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
rtpcb 120 116 0 113 1 0 1 1 0 8 0
rtentry 112 306 0 210 4 0 4 4 0 8 0
unpcb 136 1578 0 1565 8 7 1 5 0 8 0
syncache 296 33 0 33 8 8 0 1 0 8 0
tcpqe 32 17 0 17 6 6 0 1 0 8 0
tcpcb 736 817 0 813 26 25 1 7 0 8 0
arp 88 47 0 33 1 0 1 1 0 8 0
ipq 40 9 0 9 3 3 0 1 0 8 0
ipqe 40 313 0 313 3 3 0 1 0 8 0
inpcb 304 2111 0 2104 22 21 1 6 0 8 0
rttmr 72 19 0 19 1 1 0 1 0 8 0
ip6q 72 1 0 1 1 1 0 1 0 8 0
ip6af 40 1 0 1 1 1 0 1 0 8 0
nd6 48 68 0 46 1 0 1 1 0 8 0
pkpcb 40 36 0 36 4 4 0 1 0 8 0
kcovpl 48 22 0 14 1 0 1 1 0 8 0
ppxss 1152 13 0 13 4 4 0 1 0 8 0
pfstscr 40 13 0 13 1 1 0 1 0 8 0
pffrag 232 27 0 7 2 0 2 2 0 482 0
pffrnode 88 16 0 7 1 0 1 1 0 8 0
pffrent 40 166 0 146 1 0 1 1 0 8 0
pfosfp 40 1 0 0 1 0 1 1 0 8 0
pfosfpen 112 1 0 0 1 0 1 1 0 8 0
pfrktable 1344 29 0 29 1 1 0 1 0 8 0
pftag 88 5 0 2 1 0 1 1 0 8 0
pfstitem 24 20 0 20 1 1 0 1 0 8 0
pfstkey 112 28 0 28 1 1 0 1 0 8 0
pfstate 320 14 0 14 1 1 0 1 0 8 0
pfrule 1360 59 0 53 3 2 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 1107 0 695 35 9 26 29 0 8 0
art_table 32 1108 0 695 4 0 4 4 0 8 0
art_node 16 299 0 212 1 0 1 1 0 8 0
sysvmsgpl 40 3 0 0 1 0 1 1 0 8 0
semapl 112 8 0 0 1 0 1 1 0 8 0
shmpl 112 29 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 10665 0 9234 91 0 91 91 0 8 0
ffsino 240 10665 0 9234 86 0 86 86 0 8 0
nchpl 144 19558 0 17941 62 0 62 62 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 54075 0 54073 7 6 1 2 0 8 0
vcpupl 1984 15 0 4 2 0 2 2 0 8 0
vmpool 528 16 0 5 2 1 1 2 0 8 0
pfiaddrpl 120 8 0 8 1 1 0 1 0 8 0
scsiplug 72 6 0 6 1 1 0 1 0 8 0
scxspl 216 63925 0 63924 14 12 2 8 0 8 1
plimitpl 152 158 0 144 1 0 1 1 0 8 0
sigapl 424 8233 0 8194 6 1 5 6 0 8 0
futexpl 64 44235 0 44234 6 5 1 1 0 8 0
knotepl 120 65895 0 65815 6 3 3 4 0 8 0
kqueuepl 184 453 0 445 1 0 1 1 0 8 0
pipepl 304 427 0 399 3 0 3 3 0 8 0
fdescpl 432 8219 0 8194 4 0 4 4 0 8 0
filepl 120 24852 0 24617 27 16 11 12 0 8 3
lockfpl 104 599 0 597 1 0 1 1 0 8 0
lockfspl 48 190 0 188 1 0 1 1 0 8 0
sessionpl 144 37 0 21 1 0 1 1 0 8 0
pgrppl 48 61 0 45 1 0 1 1 0 8 0
ucredpl 96 5267 0 5257 1 0 1 1 0 8 0
zombiepl 144 8194 0 8192 1 0 1 1 0 8 0
processpl 1000 8233 0 8192 7 1 6 7 0 8 0
procpl 672 17132 0 17083 16 10 6 6 0 8 1
sosppl 168 64 0 64 8 8 0 1 0 8 0
sockpl 448 3843 0 3820 41 36 5 17 0 8 2
mcl64k 65536 159 0 159 9 8 1 2 0 8 1
mcl16k 16384 81 0 81 12 11 1 1 0 8 1
mcl12k 12288 103 0 103 11 10 1 1 0 8 1
mcl9k 9216 63 0 63 9 8 1 1 0 8 1
mcl8k 8192 349 0 349 12 11 1 1 0 8 1
mcl4k 4096 261 0 261 14 13 1 1 0 8 1
mcl2k2 2112 14 0 14 6 6 0 1 0 8 0
mcl2k 2048 31621 0 31544 44 32 12 14 0 8 0
mtagpl 96 1020 0 514 15 2 13 13 0 8 0
mbufpl 256 117060 0 116337 94 46 48 68 0 8 1
bufpl 288 14053 0 7645 458 0 458 458 0 8 0
anonpl 24 2083807 0 2074166 162 90 72 110 0 188 0
amapchunkpl 152 224570 0 224027 76 49 27 46 0 158 2
amappl16 200 18502 0 18239 86 71 15 32 0 8 0
amappl15 192 1656 0 1651 1 0 1 1 0 8 0
amappl14 184 1294 0 1290 1 0 1 1 0 8 0
amappl13 176 2086 0 2082 1 0 1 1 0 8 0
amappl12 168 1025 0 1021 1 0 1 1 0 8 0
amappl11 160 1342 0 1329 1 0 1 1 0 8 0
amappl10 152 1003 0 995 1 0 1 1 0 8 0
amappl9 144 796 0 791 1 0 1 1 0 8 0
amappl8 136 1681 0 1562 5 0 5 5 0 8 0
amappl7 128 794 0 784 1 0 1 1 0 8 0
amappl6 120 569 0 543 2 1 1 2 0 8 0
amappl5 112 6254 0 6241 1 0 1 1 0 8 0
amappl4 104 4480 0 4449 2 0 2 2 0 8 0
amappl3 96 2273 0 2259 1 0 1 1 0 8 0
amappl2 88 3022 0 2966 3 1 2 3 0 8 0
amappl1 80 138208 0 137698 27 14 13 18 0 8 1
amappl 88 93816 0 93617 6 0 6 6 0 92 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 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 72 31 0 0 1 0 1 1 0 8 0
uaddrrnd 24 8235 0 8199 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 8235 0 8199 1 0 1 1 0 8 0
vmmpekpl 168 45270 0 45226 3 0 3 3 0 8 0
vmmpepl 168 710884 0 708820 179 74 105 113 0 357 6
vmsppl 272 8234 0 8198 4 1 3 3 0 8 0
rwobjpl 24 163275 0 156106 47 2 45 46 0 8 0
pdppl 4096 16476 0 16407 346 271 75 79 0 8 6
pvpl 32 3726825 0 3713253 405 278 127 257 0 265 0
pmappl 216 8234 0 8198 3 0 3 3 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 1289 0 473 25 0 25 25 0 8 0
ddb> machine ddbcpu 0
No such command
ddb> trace
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -7
ddb> machine ddbcpu 1
No such command
ddb> trace
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d _atomic_swap_64 machine/atomic.h:117 [inline]
pmap_page_remove(fffffd8005d52f00) at pmap_page_remove+0x30d sys/arch/amd64/amd64/pmap.c:1959
uvm_anfree_list(fffffd806bfee840,ffff8000215be9a8) at uvm_anfree_list+0x98
amap_wipeout(fffffd807af82210) at amap_wipeout+0x1b1 sys/uvm/uvm_amap.c:504
uvm_unmap_detach(ffff8000215bea70,1) at uvm_unmap_detach+0x7d sys/uvm/uvm_map.c:1607
uvm_map_teardown(fffffd8066ebf440) at uvm_map_teardown+0x232 sys/uvm/uvm_map.c:2808
uvmspace_free(fffffd8066ebf440) at uvmspace_free+0x86 sys/uvm/uvm_map.c:3707
reaper(ffff8000fffff500) at reaper+0x15e sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -7
---
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Anton Lindqvist
Feb 15, 2022, 1:33:08 AM2/15/22
to syzbot, syzkaller-o...@googlegroups.com
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