assert "uvm_page_owner_locked_p(pg)" failed in uvm_page.c
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syzbot
Dec 27, 2021, 2:34:27 AM12/27/21
to syzkaller-o...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: b5f6de732cb5 zap doubled semicolon
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12ca0063b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=78e55b3fe74e144f033b
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+78e55b...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1268
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
200482 96275 0 0x2 0x4000000 1 syz-fuzzer
*163527 42061 0 0x14000 0x200 0K reaper
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824566cc) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c41fc,ffffffff82447fad,4f4,ffffffff8247bae8) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pageunwire(fffffd8007e50a00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268
uvm_fault_unwire_locked(fffffd806ef34cf8,f1ccd26000,f1ccf25000) at uvm_fault_unwire_locked+0x24b sys/uvm/uvm_fault.c:1656
uvm_unmap_kill_entry_withlock(fffffd806ef34cf8,fffffd805ffbb808,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
uvmspace_free(fffffd806ef34cf8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff800021149500) at reaper+0x18b sys/kern/kern_exit.c:462
end trace frame: 0x0, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1268
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824566cc) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c41fc,ffffffff82447fad,4f4,ffffffff8247bae8) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pageunwire(fffffd8007e50a00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268
uvm_fault_unwire_locked(fffffd806ef34cf8,f1ccd26000,f1ccf25000) at uvm_fault_unwire_locked+0x24b sys/uvm/uvm_fault.c:1656
uvm_unmap_kill_entry_withlock(fffffd806ef34cf8,fffffd805ffbb808,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
uvmspace_free(fffffd806ef34cf8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff800021149500) at reaper+0x18b sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -9
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000211853b0
rbx 0xffffffff82834bff cpu_info_full_primary+0x2bff
rdx 0
rcx 0
rax 0xffff800021149500
r8 0x101010101010101
r9 0x8080808080808080
r10 0xda24f19c8a91f3da
r11 0x47065835569465a6
r12 0xffffffff82834a00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff814f6dd8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000211853a0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (reaper) pid=163527 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800021149260,0xffff800021149cf0
process=0xffff8000ffffdd18 user=0xffff800021180000, vmspace=0xffffffff829d9d80
estcpu=36, cpticks=55, pctcpu=17.83
user=0, sys=328, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7773 402634 96275 0 3 0x82 wait syz-executor.2
73107 210537 96275 0 3 0x82 wait syz-executor.3
75253 398621 96275 0 2 0x482 syz-executor.1
57601 499773 0 0 3 0x14200 acct acct
16627 139508 1 0 3 0x100083 ttyopn getty
15067 437438 0 0 3 0x14200 bored sosplice
96275 185623 89498 0 3 0x82 thrsleep syz-fuzzer
96275 516608 89498 0 2 0x4000482 syz-fuzzer
96275 65894 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 2427 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 200482 89498 0 7 0x4000002 syz-fuzzer
96275 335836 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 36046 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 152319 89498 0 3 0x4000082 thrsleep syz-fuzzer
89498 154944 65279 0 3 0x10008a sigsusp ksh
65279 114706 61361 0 3 0x9a poll sshd
61361 88204 1 0 3 0x88 poll sshd
11140 3278 61521 74 2 0x100492 pflogd
61521 232918 1 0 3 0x80 netio pflogd
34698 29632 74930 73 2 0x100010 syslogd
74930 509188 1 0 3 0x100082 netio syslogd
60931 187891 1 0 3 0x100080 kqread resolvd
94981 232464 39804 77 3 0x100092 kqread dhcpleased
66520 494386 39804 77 2 0x100492 dhcpleased
39804 847 1 0 3 0x80 kqread dhcpleased
44651 462515 0 0 3 0x14200 bored smr
83872 20946 0 0 2 0x14200 zerothread
46253 168119 0 0 3 0x14200 aiodoned aiodoned
23813 329973 0 0 2 0x14600 update
76633 414884 0 0 3 0x14200 cleaner cleaner
*42061 163527 0 0 7 0x14200 reaper
24464 76967 0 0 3 0x14200 pgdaemon pagedaemon
97558 245392 0 0 3 0x14200 bored viomb
67736 47703 0 0 3 0x40014200 acpi0 acpi0
354 91587 0 0 3 0x40014200 idle1
48700 383363 0 0 3 0x14200 bored softnet
1874 79365 0 0 2 0x14200 systqmp
90634 425713 0 0 2 0x14200 systq
78897 171998 0 0 2 0x40014200 softclock
21308 294254 0 0 3 0x40014200 idle0
1 509094 0 0 3 0x80082 wait init
0 0 -1 0 2 0x10200 swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &uvm.pageqlock r = 0 (0xffffffff8297de48)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_fault_unwire_locked+0x243 sys/uvm/uvm_fault.c:1655
#4 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
#5 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#5 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#7 reaper+0x18b sys/kern/kern_exit.c:462
#8 proc_trampoline+0x1c
Process 34698 (syslogd) thread 0xffff8000ffff7270 (29632)
exclusive rrwlock inode r = 0 (0xfffffd806e7b5700)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 sys_fsync+0xf5 sys/kern/vfs_syscalls.c:2923
#6 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
Process 42061 (reaper) thread 0xffff800021149500 (163527)
exclusive rwlock uobjlk r = 0 (0xfffffd805fc57408)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310
#2 uvm_fault_unwire_locked+0x1e8 sys/uvm/uvm_fault.c:1643
#3 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
#4 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#4 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#5 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#6 reaper+0x18b sys/kern/kern_exit.c:462
#7 proc_trampoline+0x1c
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82983120)
#0 witness_lock+0x44d
#1 uvm_unmap_kill_entry_withlock+0x4c sys/uvm/uvm_map.c:2134
#2 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#2 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#3 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#4 reaper+0x18b sys/kern/kern_exit.c:462
#5 proc_trampoline+0x1c
exclusive mutex &uvm.pageqlock r = 0 (0xffffffff8297de48)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_fault_unwire_locked+0x243 sys/uvm/uvm_fault.c:1655
#4 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
#5 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#5 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#7 reaper+0x18b sys/kern/kern_exit.c:462
#8 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10243 6499K 7314K 78643K 36599 0
pcb 13 18K 23K 78643K 2946 0
rtable 166 23K 26K 78643K 4795 0
ifaddr 80 22K 26K 78643K 1674 0
sysctl 3 1K 1K 78643K 5 0
counters 46 34K 35K 78643K 452 0
ioctlops 0 0K 4K 78643K 5125 0
iov 0 0K 16K 78643K 1418 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1425 90K 90K 78643K 11424 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 149 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 24 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 5 13K 49K 78643K 20649 0
sigio 0 0K 0K 78643K 139 0
proc 72 87K 111K 78643K 3163 0
subproc 39 2K 3K 78643K 962 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 1047 0
in_multi 40 2K 3K 78643K 2085 0
ether_multi 1 0K 0K 78643K 287 0
mrt 1 0K 0K 78643K 57 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 427 1897K 1897K 78643K 427 0
exec 0 0K 2K 78643K 4212 0
pfkey data 0 0K 0K 78643K 7 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 628 1530K 1530K 78643K 264155 0
UVM aobj 131 9K 9K 78643K 140 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 1380 0
NDP 8 0K 1K 78643K 444 0
temp 110 4225K 8322K 78643K 155022 0
kqueue 10 14K 22K 78643K 766 0
SYN cache 2 8K 16K 78643K 3 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 1161 0 1158 18 17 1 3 0 8 0
rtentry 112 1224 0 1178 4 1 3 3 0 8 0
unpcb 128 53895 0 53880 174 173 1 9 0 8 0
syncache 296 63 0 63 21 21 0 1 0 8 0
tcpqe 32 14 27 14 5 5 0 1 0 8 0
tcpcb 736 7721 0 7713 237 234 3 19 0 8 1
arp 120 170 0 162 1 0 1 1 0 8 0
inpcb 304 35509 0 35498 239 236 3 19 0 8 2
rttmr 72 17 0 17 5 5 0 1 0 8 0
nd6 48 382 0 374 1 0 1 1 0 8 0
pkpcb 40 214 0 214 13 13 0 1 0 8 0
kcovpl 48 74 0 71 1 0 1 1 0 8 0
ppxss 1248 58 0 58 14 14 0 1 0 8 0
pfstscr 40 28 0 28 6 6 0 1 0 8 0
pffrag 232 110 0 108 10 9 1 1 0 482 0
pffrnode 88 110 0 108 10 9 1 1 0 8 0
pffrent 40 1308 0 1306 10 9 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 459 0 438 6 4 2 3 0 8 0
pftag 88 27 0 24 3 2 1 1 0 8 0
pfstitem 24 25 0 23 1 0 1 1 0 8 0
pfstkey 112 67 0 65 1 0 1 1 0 8 0
pfstate 320 45 0 43 1 0 1 1 0 8 0
pfsrctr 152 33 0 33 1 1 0 1 0 8 0
pfrule 1360 1055 0 957 12 3 9 9 0 8 0
art_heap8 4096 2 0 1 2 1 1 2 0 8 0
art_heap4 256 5226 0 5015 48 31 17 20 0 8 0
art_table 32 5228 0 5016 4 1 3 3 0 8 0
art_node 16 1222 0 1183 1 0 1 1 0 8 0
sysvmsgpl 40 40 0 18 1 0 1 1 0 8 0
semupl 112 4 0 4 1 1 0 1 0 8 0
semapl 112 13 0 3 1 0 1 1 0 8 0
shmpl 112 137 0 9 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 28316 0 26833 94 0 94 94 0 8 0
ffsino 272 28316 0 26833 100 0 100 100 0 8 0
nchpl 144 54706 0 53118 61 0 61 61 0 8 0
uvmvnodes 80 6344 0 0 130 0 130 130 0 8 0
vnodes 224 6344 0 0 374 0 374 374 0 8 0
namei 1024 182346 0 182346 4 3 1 1 0 8 1
percpumem 16 238 0 203 1 0 1 1 0 8 0
vcpupl 2048 359 0 0 45 0 45 45 0 8 0
vmpool 560 388 0 29 26 0 26 26 0 8 0
pfiaddrpl 120 184 0 161 1 0 1 1 0 8 0
scxspl 216 173066 0 173066 42 41 1 8 0 8 1
plimitpl 152 2237 0 2226 1 0 1 1 0 8 0
sigapl 424 20731 0 20697 9 3 6 7 0 8 0
futexpl 64 181867 0 181867 6 5 1 1 0 8 1
knotepl 112 265 0 0 4 0 4 4 0 8 0
kqueuepl 216 3996 0 3987 84 83 1 8 0 8 0
pipepl 336 4128 0 4115 115 113 2 12 0 8 0
fdescpl 496 20673 0 20655 5 2 3 4 0 8 0
filepl 152 179304 0 179173 286 278 8 23 0 8 2
lockfpl 104 4860 0 4858 8 7 1 2 0 8 0
lockfspl 48 1328 0 1326 1 0 1 1 0 8 0
sessionpl 144 91 0 78 1 0 1 1 0 8 0
pgrppl 48 289 0 276 1 0 1 1 0 8 0
ucredpl 96 16650 0 16637 1 0 1 1 0 8 0
zombiepl 144 20697 0 20693 1 0 1 1 0 8 0
processpl 1064 20731 0 20693 4 1 3 4 0 8 0
procpl 672 62177 0 62121 34 29 5 8 0 8 0
srpgc 96 98 0 98 13 13 0 1 0 8 0
sosppl 168 142 0 140 21 20 1 1 0 8 0
sockpl 480 90896 0 90867 2141 2135 6 53 0 8 2
mcl64k 65536 66 0 0 3 1 2 3 0 8 0
mcl16k 16384 25 0 0 4 1 3 3 0 8 0
mcl12k 12288 43 0 0 2 0 2 2 0 8 0
mcl9k 9216 33 0 0 2 0 2 2 0 8 0
mcl8k 8192 36 0 0 4 1 3 3 0 8 0
mcl4k 4096 59 0 0 4 2 2 3 0 8 0
mcl2k2 2112 13 0 0 1 0 1 1 0 8 0
mcl2k 2048 367 0 0 24 5 19 21 0 8 0
mtagpl 96 967 0 0 9 1 8 8 0 8 0
mbufpl 256 2400 0 0 116 1 115 116 0 8 0
bufpl 288 37365 0 31020 454 0 454 454 0 8 0
anonpl 24 5927106 0 5903101 475 313 162 188 0 186 0
amapchunkpl 152 645206 0 644055 164 118 46 62 0 158 0
amappl16 200 52186 0 51423 202 161 41 54 0 8 0
amappl15 192 4278 0 4278 2 2 0 1 0 8 0
amappl14 184 3421 0 3419 1 0 1 1 0 8 0
amappl13 176 3143 0 3141 1 0 1 1 0 8 0
amappl12 168 1410 0 1405 1 0 1 1 0 8 0
amappl11 160 2626 0 2611 1 0 1 1 0 8 0
amappl10 152 3517 0 3508 1 0 1 1 0 8 0
amappl9 144 3327 0 3318 1 0 1 1 0 8 0
amappl8 136 2357 0 2246 4 0 4 4 0 8 0
amappl7 128 787 0 776 1 0 1 1 0 8 0
amappl6 120 3433 0 3404 1 0 1 1 0 8 0
amappl5 112 18831 0 18810 1 0 1 1 0 8 0
amappl4 104 7881 0 7852 1 0 1 1 0 8 0
amappl3 96 4125 0 4107 1 0 1 1 0 8 0
amappl2 88 5140 0 5060 2 0 2 2 0 8 0
amappl1 80 379121 0 378603 14 3 11 13 0 8 0
amappl 88 262079 0 261735 9 1 8 8 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 72 139 0 9 3 0 3 3 0 8 0
uaddrrnd 24 21061 0 20681 3 0 3 3 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 21061 0 20681 3 0 3 3 0 8 0
vmmpekpl 168 147953 0 147882 5 1 4 4 0 8 0
vmmpepl 168 1899909 0 1896729 494 354 140 166 0 357 0
vmsppl 368 21060 0 20680 35 0 35 35 0 8 0
rwobjpl 56 460668 0 452329 157 39 118 121 0 8 0
pdppl 4096 42130 0 41719 509 97 412 415 0 8 1
pvpl 32 9995872 0 9974824 812 559 253 306 0 265 45
pmappl 248 21060 0 20680 24 0 24 24 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 1816 0 495 39 0 39 39 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824566cc) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c41fc,ffffffff82447fad,4f4,ffffffff8247bae8) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pageunwire(fffffd8007e50a00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268
uvm_fault_unwire_locked(fffffd806ef34cf8,f1ccd26000,f1ccf25000) at uvm_fault_unwire_locked+0x24b sys/uvm/uvm_fault.c:1656
uvm_unmap_kill_entry_withlock(fffffd806ef34cf8,fffffd805ffbb808,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
uvmspace_free(fffffd806ef34cf8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff800021149500) at reaper+0x18b sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff80002124a4f0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff80002124a4f0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x20acf9e80, count: 9
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff80002124a4f0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff80002124a4f0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x20acf9e80, count: -6
---
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syzbot found the following issue on:
HEAD commit: b5f6de732cb5 zap doubled semicolon
git tree: openbsd
console output: https://syzkaller.appspot.com/x/log.txt?x=12ca0063b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=bf87b6915a88cd0d
dashboard link: https://syzkaller.appspot.com/bug?extid=78e55b3fe74e144f033b
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+78e55b...@syzkaller.appspotmail.com
panic: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1268
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
200482 96275 0 0x2 0x4000000 1 syz-fuzzer
*163527 42061 0 0x14000 0x200 0K reaper
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824566cc) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c41fc,ffffffff82447fad,4f4,ffffffff8247bae8) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pageunwire(fffffd8007e50a00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268
uvm_fault_unwire_locked(fffffd806ef34cf8,f1ccd26000,f1ccf25000) at uvm_fault_unwire_locked+0x24b sys/uvm/uvm_fault.c:1656
uvm_unmap_kill_entry_withlock(fffffd806ef34cf8,fffffd805ffbb808,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
uvmspace_free(fffffd806ef34cf8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff800021149500) at reaper+0x18b sys/kern/kern_exit.c:462
end trace frame: 0x0, 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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: kernel diagnostic assertion "uvm_page_owner_locked_p(pg)" failed: file "/syzkaller/managers/multicore/kernel/sys/uvm/uvm_page.c", line 1268
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824566cc) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c41fc,ffffffff82447fad,4f4,ffffffff8247bae8) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pageunwire(fffffd8007e50a00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268
uvm_fault_unwire_locked(fffffd806ef34cf8,f1ccd26000,f1ccf25000) at uvm_fault_unwire_locked+0x24b sys/uvm/uvm_fault.c:1656
uvm_unmap_kill_entry_withlock(fffffd806ef34cf8,fffffd805ffbb808,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
uvmspace_free(fffffd806ef34cf8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff800021149500) at reaper+0x18b sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -9
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000211853b0
rbx 0xffffffff82834bff cpu_info_full_primary+0x2bff
rdx 0
rcx 0
rax 0xffff800021149500
r8 0x101010101010101
r9 0x8080808080808080
r10 0xda24f19c8a91f3da
r11 0x47065835569465a6
r12 0xffffffff82834a00 cpu_info_full_primary+0x2a00
r13 0
r14 0
r15 0x1
rip 0xffffffff814f6dd8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff8000211853a0
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{0}> show proc
PROC (reaper) pid=163527 stat=onproc
flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
pri=86, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff800021149260,0xffff800021149cf0
process=0xffff8000ffffdd18 user=0xffff800021180000, vmspace=0xffffffff829d9d80
estcpu=36, cpticks=55, pctcpu=17.83
user=0, sys=328, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
7773 402634 96275 0 3 0x82 wait syz-executor.2
73107 210537 96275 0 3 0x82 wait syz-executor.3
75253 398621 96275 0 2 0x482 syz-executor.1
57601 499773 0 0 3 0x14200 acct acct
16627 139508 1 0 3 0x100083 ttyopn getty
15067 437438 0 0 3 0x14200 bored sosplice
96275 185623 89498 0 3 0x82 thrsleep syz-fuzzer
96275 516608 89498 0 2 0x4000482 syz-fuzzer
96275 65894 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 2427 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 200482 89498 0 7 0x4000002 syz-fuzzer
96275 335836 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 36046 89498 0 3 0x4000082 thrsleep syz-fuzzer
96275 152319 89498 0 3 0x4000082 thrsleep syz-fuzzer
89498 154944 65279 0 3 0x10008a sigsusp ksh
65279 114706 61361 0 3 0x9a poll sshd
61361 88204 1 0 3 0x88 poll sshd
11140 3278 61521 74 2 0x100492 pflogd
61521 232918 1 0 3 0x80 netio pflogd
34698 29632 74930 73 2 0x100010 syslogd
74930 509188 1 0 3 0x100082 netio syslogd
60931 187891 1 0 3 0x100080 kqread resolvd
94981 232464 39804 77 3 0x100092 kqread dhcpleased
66520 494386 39804 77 2 0x100492 dhcpleased
39804 847 1 0 3 0x80 kqread dhcpleased
44651 462515 0 0 3 0x14200 bored smr
83872 20946 0 0 2 0x14200 zerothread
46253 168119 0 0 3 0x14200 aiodoned aiodoned
23813 329973 0 0 2 0x14600 update
76633 414884 0 0 3 0x14200 cleaner cleaner
*42061 163527 0 0 7 0x14200 reaper
24464 76967 0 0 3 0x14200 pgdaemon pagedaemon
97558 245392 0 0 3 0x14200 bored viomb
67736 47703 0 0 3 0x40014200 acpi0 acpi0
354 91587 0 0 3 0x40014200 idle1
48700 383363 0 0 3 0x14200 bored softnet
1874 79365 0 0 2 0x14200 systqmp
90634 425713 0 0 2 0x14200 systq
78897 171998 0 0 2 0x40014200 softclock
21308 294254 0 0 3 0x40014200 idle0
1 509094 0 0 3 0x80082 wait init
0 0 -1 0 2 0x10200 swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &uvm.pageqlock r = 0 (0xffffffff8297de48)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_fault_unwire_locked+0x243 sys/uvm/uvm_fault.c:1655
#4 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
#5 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#5 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#7 reaper+0x18b sys/kern/kern_exit.c:462
#8 proc_trampoline+0x1c
Process 34698 (syslogd) thread 0xffff8000ffff7270 (29632)
exclusive rrwlock inode r = 0 (0xfffffd806e7b5700)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0x8b sys/kern/kern_rwlock.c:461
#3 VOP_LOCK+0x87 sys/kern/vfs_vops.c:534
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:579
#5 sys_fsync+0xf5 sys/kern/vfs_syscalls.c:2923
#6 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#6 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#7 Xsyscall+0x128
Process 42061 (reaper) thread 0xffff800021149500 (163527)
exclusive rwlock uobjlk r = 0 (0xfffffd805fc57408)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310
#2 uvm_fault_unwire_locked+0x1e8 sys/uvm/uvm_fault.c:1643
#3 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
#4 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#4 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#5 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#6 reaper+0x18b sys/kern/kern_exit.c:462
#7 proc_trampoline+0x1c
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82983120)
#0 witness_lock+0x44d
#1 uvm_unmap_kill_entry_withlock+0x4c sys/uvm/uvm_map.c:2134
#2 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#2 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#3 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#4 reaper+0x18b sys/kern/kern_exit.c:462
#5 proc_trampoline+0x1c
exclusive mutex &uvm.pageqlock r = 0 (0xffffffff8297de48)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 uvm_fault_unwire_locked+0x243 sys/uvm/uvm_fault.c:1655
#4 uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
#5 uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
#5 uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
#6 uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
#7 reaper+0x18b sys/kern/kern_exit.c:462
#8 proc_trampoline+0x1c
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10243 6499K 7314K 78643K 36599 0
pcb 13 18K 23K 78643K 2946 0
rtable 166 23K 26K 78643K 4795 0
ifaddr 80 22K 26K 78643K 1674 0
sysctl 3 1K 1K 78643K 5 0
counters 46 34K 35K 78643K 452 0
ioctlops 0 0K 4K 78643K 5125 0
iov 0 0K 16K 78643K 1418 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1425 90K 90K 78643K 11424 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 5K 78643K 149 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 24 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 5 13K 49K 78643K 20649 0
sigio 0 0K 0K 78643K 139 0
proc 72 87K 111K 78643K 3163 0
subproc 39 2K 3K 78643K 962 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 1047 0
in_multi 40 2K 3K 78643K 2085 0
ether_multi 1 0K 0K 78643K 287 0
mrt 1 0K 0K 78643K 57 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 427 1897K 1897K 78643K 427 0
exec 0 0K 2K 78643K 4212 0
pfkey data 0 0K 0K 78643K 7 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 628 1530K 1530K 78643K 264155 0
UVM aobj 131 9K 9K 78643K 140 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 1380 0
NDP 8 0K 1K 78643K 444 0
temp 110 4225K 8322K 78643K 155022 0
kqueue 10 14K 22K 78643K 766 0
SYN cache 2 8K 16K 78643K 3 0
ddb{0}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 1161 0 1158 18 17 1 3 0 8 0
rtentry 112 1224 0 1178 4 1 3 3 0 8 0
unpcb 128 53895 0 53880 174 173 1 9 0 8 0
syncache 296 63 0 63 21 21 0 1 0 8 0
tcpqe 32 14 27 14 5 5 0 1 0 8 0
tcpcb 736 7721 0 7713 237 234 3 19 0 8 1
arp 120 170 0 162 1 0 1 1 0 8 0
inpcb 304 35509 0 35498 239 236 3 19 0 8 2
rttmr 72 17 0 17 5 5 0 1 0 8 0
nd6 48 382 0 374 1 0 1 1 0 8 0
pkpcb 40 214 0 214 13 13 0 1 0 8 0
kcovpl 48 74 0 71 1 0 1 1 0 8 0
ppxss 1248 58 0 58 14 14 0 1 0 8 0
pfstscr 40 28 0 28 6 6 0 1 0 8 0
pffrag 232 110 0 108 10 9 1 1 0 482 0
pffrnode 88 110 0 108 10 9 1 1 0 8 0
pffrent 40 1308 0 1306 10 9 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 459 0 438 6 4 2 3 0 8 0
pftag 88 27 0 24 3 2 1 1 0 8 0
pfstitem 24 25 0 23 1 0 1 1 0 8 0
pfstkey 112 67 0 65 1 0 1 1 0 8 0
pfstate 320 45 0 43 1 0 1 1 0 8 0
pfsrctr 152 33 0 33 1 1 0 1 0 8 0
pfrule 1360 1055 0 957 12 3 9 9 0 8 0
art_heap8 4096 2 0 1 2 1 1 2 0 8 0
art_heap4 256 5226 0 5015 48 31 17 20 0 8 0
art_table 32 5228 0 5016 4 1 3 3 0 8 0
art_node 16 1222 0 1183 1 0 1 1 0 8 0
sysvmsgpl 40 40 0 18 1 0 1 1 0 8 0
semupl 112 4 0 4 1 1 0 1 0 8 0
semapl 112 13 0 3 1 0 1 1 0 8 0
shmpl 112 137 0 9 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 28316 0 26833 94 0 94 94 0 8 0
ffsino 272 28316 0 26833 100 0 100 100 0 8 0
nchpl 144 54706 0 53118 61 0 61 61 0 8 0
uvmvnodes 80 6344 0 0 130 0 130 130 0 8 0
vnodes 224 6344 0 0 374 0 374 374 0 8 0
namei 1024 182346 0 182346 4 3 1 1 0 8 1
percpumem 16 238 0 203 1 0 1 1 0 8 0
vcpupl 2048 359 0 0 45 0 45 45 0 8 0
vmpool 560 388 0 29 26 0 26 26 0 8 0
pfiaddrpl 120 184 0 161 1 0 1 1 0 8 0
scxspl 216 173066 0 173066 42 41 1 8 0 8 1
plimitpl 152 2237 0 2226 1 0 1 1 0 8 0
sigapl 424 20731 0 20697 9 3 6 7 0 8 0
futexpl 64 181867 0 181867 6 5 1 1 0 8 1
knotepl 112 265 0 0 4 0 4 4 0 8 0
kqueuepl 216 3996 0 3987 84 83 1 8 0 8 0
pipepl 336 4128 0 4115 115 113 2 12 0 8 0
fdescpl 496 20673 0 20655 5 2 3 4 0 8 0
filepl 152 179304 0 179173 286 278 8 23 0 8 2
lockfpl 104 4860 0 4858 8 7 1 2 0 8 0
lockfspl 48 1328 0 1326 1 0 1 1 0 8 0
sessionpl 144 91 0 78 1 0 1 1 0 8 0
pgrppl 48 289 0 276 1 0 1 1 0 8 0
ucredpl 96 16650 0 16637 1 0 1 1 0 8 0
zombiepl 144 20697 0 20693 1 0 1 1 0 8 0
processpl 1064 20731 0 20693 4 1 3 4 0 8 0
procpl 672 62177 0 62121 34 29 5 8 0 8 0
srpgc 96 98 0 98 13 13 0 1 0 8 0
sosppl 168 142 0 140 21 20 1 1 0 8 0
sockpl 480 90896 0 90867 2141 2135 6 53 0 8 2
mcl64k 65536 66 0 0 3 1 2 3 0 8 0
mcl16k 16384 25 0 0 4 1 3 3 0 8 0
mcl12k 12288 43 0 0 2 0 2 2 0 8 0
mcl9k 9216 33 0 0 2 0 2 2 0 8 0
mcl8k 8192 36 0 0 4 1 3 3 0 8 0
mcl4k 4096 59 0 0 4 2 2 3 0 8 0
mcl2k2 2112 13 0 0 1 0 1 1 0 8 0
mcl2k 2048 367 0 0 24 5 19 21 0 8 0
mtagpl 96 967 0 0 9 1 8 8 0 8 0
mbufpl 256 2400 0 0 116 1 115 116 0 8 0
bufpl 288 37365 0 31020 454 0 454 454 0 8 0
anonpl 24 5927106 0 5903101 475 313 162 188 0 186 0
amapchunkpl 152 645206 0 644055 164 118 46 62 0 158 0
amappl16 200 52186 0 51423 202 161 41 54 0 8 0
amappl15 192 4278 0 4278 2 2 0 1 0 8 0
amappl14 184 3421 0 3419 1 0 1 1 0 8 0
amappl13 176 3143 0 3141 1 0 1 1 0 8 0
amappl12 168 1410 0 1405 1 0 1 1 0 8 0
amappl11 160 2626 0 2611 1 0 1 1 0 8 0
amappl10 152 3517 0 3508 1 0 1 1 0 8 0
amappl9 144 3327 0 3318 1 0 1 1 0 8 0
amappl8 136 2357 0 2246 4 0 4 4 0 8 0
amappl7 128 787 0 776 1 0 1 1 0 8 0
amappl6 120 3433 0 3404 1 0 1 1 0 8 0
amappl5 112 18831 0 18810 1 0 1 1 0 8 0
amappl4 104 7881 0 7852 1 0 1 1 0 8 0
amappl3 96 4125 0 4107 1 0 1 1 0 8 0
amappl2 88 5140 0 5060 2 0 2 2 0 8 0
amappl1 80 379121 0 378603 14 3 11 13 0 8 0
amappl 88 262079 0 261735 9 1 8 8 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 72 139 0 9 3 0 3 3 0 8 0
uaddrrnd 24 21061 0 20681 3 0 3 3 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 21061 0 20681 3 0 3 3 0 8 0
vmmpekpl 168 147953 0 147882 5 1 4 4 0 8 0
vmmpepl 168 1899909 0 1896729 494 354 140 166 0 357 0
vmsppl 368 21060 0 20680 35 0 35 35 0 8 0
rwobjpl 56 460668 0 452329 157 39 118 121 0 8 0
pdppl 4096 42130 0 41719 509 97 412 415 0 8 1
pvpl 32 9995872 0 9974824 812 559 253 306 0 265 45
pmappl 248 21060 0 20680 24 0 24 24 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 1816 0 495 39 0 39 39 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff824566cc) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff824c41fc,ffffffff82447fad,4f4,ffffffff8247bae8) at __assert+0x25 sys/kern/subr_prf.c:161
uvm_pageunwire(fffffd8007e50a00) at uvm_pageunwire+0x19b sys/uvm/uvm_page.c:1268
uvm_fault_unwire_locked(fffffd806ef34cf8,f1ccd26000,f1ccf25000) at uvm_fault_unwire_locked+0x24b sys/uvm/uvm_fault.c:1656
uvm_unmap_kill_entry_withlock(fffffd806ef34cf8,fffffd805ffbb808,0) at uvm_unmap_kill_entry_withlock+0x67 sys/uvm/uvm_map.c:2136
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 uvm_map_addr_RBT_LEFT sys/uvm/uvm_map.h:176 [inline]
uvm_map_teardown(fffffd806ef34cf8) at uvm_map_teardown+0x197 sys/uvm/uvm_map.c:2771
uvmspace_free(fffffd806ef34cf8) at uvmspace_free+0xa6 sys/uvm/uvm_map.c:3685
reaper(ffff800021149500) at reaper+0x18b sys/kern/kern_exit.c:462
end trace frame: 0x0, count: -9
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff80002124a4f0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff80002124a4f0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x20acf9e80, count: 9
ddb{1}> trace
x86_ipi_db(ffff800020d38ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393
x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82982f18) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff80002124a4f0) at syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
syscall(ffff80002124a4f0) at syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x20acf9e80, count: -6
---
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