panic: kernel diagnostic assertion "pg->wire_cWAoRuNnIt N=G:= 0S" PfLa iNlOeTd LO:WE fRiElDe O"N/ sSyYzSCkAalLLl e9r/1m a2n0a gEXeIrTs /s0etu icd
/kStopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 66403 38644 32767 0x10000010 0 1 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7b91bcb6a6a0, count: 14
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
*cpu0: kernel diagnostic assertion "pg->wire_count == 0" failed: file "/syzkaller/managers/setuid/kernel/sys/uvm/uvm_page.c", line 1326
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7b91bcb6a6a0, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff80003c41e760
rbx 0
rdx 0
rcx 0xffff8000fffeb248
rax 0x33
r8 0xffff80003c41e690
r9 0
r10 0x57b323439c225ef3
r11 0xda6c9b16cdbb72b7
r12 0
r13 0
r14 0xffff8000fffeb248
r15 0
rip 0xffffffff8151d3ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff80003c41e6e0
ss 0
savectx+0xae: movl $0,%gs:0x688
ddb{1}> show proc
PROC (syz-executor) tid=66403 pid=38644 tcnt=1 stat=onproc
flags process=10000010<SUGID,WAITEVENT> proc=0
runpri=32, usrpri=50, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffeb778,0xffff8000fffea2c8
process=0xffff80003c423510 user=0xffff80003c419000, vmspace=0xfffffd806ccdc7c8
estcpu=36, cpticks=2, pctcpu=0.0, user=0, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
54911 81918 84982 0 2 0x2 syz-executor
61062 192237 6201 32767 2 0x10 syz-executor
61062 135141 6201 32767 3 0x4000090 fsleep syz-executor
61062 268004 6201 32767 2 0x4000010 syz-executor
96699 69197 4631 32767 2 0x10 syz-executor
96699 484019 4631 32767 3 0x4000090 fsleep syz-executor
22649 94696 52786 32767 2 0x10 syz-executor
22649 379067 52786 32767 3 0x4000090 fsleep syz-executor
86867 487233 48586 32767 3 0x90 nanoslp syz-executor
86867 451785 48586 32767 3 0x4000090 fsleep syz-executor
86867 224474 48586 32767 3 0x4000090 fsleep syz-executor
*38644 66403 33019 32767 7 0x10000010 syz-executor
48586 38088 79597 32767 3 0x90 nanoslp syz-executor
6201 328762 7828 32767 3 0x90 nanoslp syz-executor
4631 503103 59752 32767 3 0x90 nanoslp syz-executor
52786 301940 46102 32767 3 0x90 nanoslp syz-executor
80620 114170 12259 32767 3 0x90 nanoslp syz-executor
56793 234027 97896 32767 3 0x90 nanoslp syz-executor
7828 506180 84982 0 3 0x82 wait syz-executor
59752 146606 84982 0 3 0x82 wait syz-executor
79597 415650 84982 0 3 0x82 wait syz-executor
46102 131731 84982 0 3 0x82 wait syz-executor
33019 425989 84982 0 3 0x82 wait syz-executor
12259 338428 84982 0 3 0x82 wait syz-executor
97896 71874 84982 0 3 0x82 wait syz-executor
84982 52245 41540 0 3 0x82 kqread syz-executor
41540 345689 6207 0 3 0x10008a sigsusp ksh
6207 504859 12849 0 3 0x98 kqread sshd-session
12849 181801 77924 0 3 0x92 kqread sshd-session
52981 25271 1 0 3 0x100083 ttyin getty
77924 291195 1 0 3 0x88 kqread sshd
44448 351494 31585 73 3 0x1100090 kqread syslogd
31585 110956 1 0 3 0x100082 sbwait syslogd
56527 157254 1 0 3 0x100080 kqread resolvd
34398 510214 47529 77 3 0x100092 kqread dhcpleased
28879 397116 47529 77 3 0x100092 kqread dhcpleased
47529 8701 1 0 3 0x80 kqread dhcpleased
33146 301076 0 0 2 0x40014200 smr
46608 490704 0 0 2 0x14200 zerothread
81241 116118 0 0 3 0x14200 aiodoned aiodoned
57244 390026 0 0 3 0x14200 syncer update
68399 90413 0 0 3 0x14200 cleaner cleaner
43496 152644 0 0 2 0x14200 reaper
7129 105953 0 0 3 0x14200 pgdaemon pagedaemon
15140 160416 0 0 3 0x14200 bored viomb
14589 175973 0 0 3 0x40014200 acpi0 acpi0
4834 515815 0 0 3 0x40014200 idle1
9832 358020 0 0 3 0x14200 bored softnet1
30598 427011 0 0 3 0x14200 bored softnet0
18806 513212 0 0 3 0x14200 smrbar systqmp
12775 269463 0 0 3 0x14200 bored systq
50608 317215 0 0 3 0x14200 tmoslp softclockmp
16508 352786 0 0 3 0x40014200 tmoslp softclock
18879 410504 0 0 3 0x40014200 idle0
1 177099 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 0:
exclusive mutex &uvm.pageqlock r = 0 (0xffffffff839e4168)
#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 uvm_pageclean+0x29c sys/uvm/uvm_page.c:980
#3 uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020
#4 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112
#5 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
#6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
#7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
#8 exit1+0x6fc sys/kern/kern_exit.c:260
#9 sys_exit+0x1a sys/kern/kern_exit.c:-1
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#11 Xsyscall+0x128
CPU 1:
exclusive mutex &sched_lock r = 0 (0xffffffff838ea458)
#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 wakeup_n+0x54 sys/kern/kern_synch.c:581
#3 uvm_pmr_freepages+0x442 sys/uvm/uvm_pmemrange.c:1338
#4 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112
#5 amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
#6 uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
#7 uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
#8 exit1+0x6fc sys/kern/kern_exit.c:260
#9 sys_exit+0x1a sys/kern/kern_exit.c:-1
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#11 Xsyscall+0x128
exclusive mutex &uvm.fpageqlock r = 0 (0xffffffff839e41a0)
#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 uvm_pmr_freepages+0x1a8 sys/uvm/uvm_pmemrange.c:-1
#3 uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112
#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:2525
#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 54911 (syz-executor) thread 0xffff80003c42afb8 (81918)
exclusive rrwlock inode r = 0 (0xfffffd806cb35a20)
#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_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 ufs_ihashins+0x4f ufs_ihash sys/ufs/ufs/ufs_ihash.c:-1 [inline]
#4 ufs_ihashins+0x4f sys/ufs/ufs/ufs_ihash.c:159
#5 ffs_vget+0x187 sys/ufs/ffs/ffs_vfsops.c:1232
#6 ffs_inode_alloc+0x279 sys/ufs/ffs/ffs_alloc.c:393
#7 ufs_mkdir+0xfc sys/ufs/ufs/ufs_vnops.c:1112
#8 VOP_MKDIR+0x101 sys/kern/vfs_vops.c:394
#9 domkdirat+0x179 sys/kern/vfs_syscalls.c:3113
#10 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#10 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#11 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd806fb4b200)
#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_write+0x419 sys/kern/kern_rwlock.c:320
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
#3 VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vfs_lookup+0x11c sys/kern/vfs_lookup.c:-1
#6 namei+0x7ca sys/kern/vfs_lookup.c:250
#7 domkdirat+0x8b sys/kern/vfs_syscalls.c:3098
#8 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
#9 Xsyscall+0x128
Process 18806 (systqmp) thread 0xffff8000ffffe530 (513212)
shared rwlock systqmp r = 0 (0xffffffff83828728)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10210 10958K 10973K 166960K 11305 0
pcb 17 12K 12K 166960K 17 0
rtable 215 6K 7K 166960K 349 0
pf 29 16K 16K 166960K 31 0
ifaddr 38 6K 7K 166960K 44 0
ifgroup 46 2K 2K 166960K 50 0
sysctl 1 1K 9K 166960K 5 0
counters 68 36K 37K 166960K 70 0
ioctlops 0 0K 2K 166960K 29 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1335 84K 84K 166960K 1365 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 5K 166960K 3 0
VM map 2 1K 1K 166960K 2 0
sem 4 0K 0K 166960K 4 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 21 74K 121K 166960K 165 0
sigio 0 0K 0K 166960K 1 0
proc 59 115K 163K 166960K 474 0
subproc 63 3K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 4 0
in_multi 88 6K 7K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 211 943K 943K 166960K 211 0
exec 0 0K 1K 166960K 349 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 219 151K 191K 166960K 3142 0
UVM aobj 4 2K 2K 166960K 4 0
pinsyscall 42 84K 109K 166960K 1205 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 24 1K 2K 166960K 27 0
temp 31 8666K 8730K 166960K 3820 0
kqueue 13 20K 22K 166960K 24 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 36 0 33 1 0 1 1 0 8 0
rtentry 176 111 0 12 5 0 5 5 0 8 0
unpcb 144 40 0 22 1 0 1 1 0 8 0
syncache 336 3 0 3 1 0 1 1 0 8 1
tcpcb 736 14 0 10 1 0 1 1 0 8 0
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 78 0 70 2 0 2 2 0 8 1
nd6 152 24 0 3 1 0 1 1 0 8 0
kcovpl 48 9 0 2 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 0 0 29 0 29 29 0 8 0
art_table 40 453 0 0 5 0 5 5 0 8 0
art_node 32 111 0 11 1 0 1 1 0 8 0
semupl 112 1 0 1 1 0 1 1 0 8 1
semapl 112 2 0 0 1 0 1 1 0 8 0
shmpl 112 1 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1580 0 64 95 0 95 95 0 8 0
ffsino 296 1580 0 64 117 0 117 117 0 8 0
nchpl 144 1787 0 90 63 0 63 63 0 8 0
vnodes 216 1670 0 0 93 0 93 93 0 8 0
namei 1024 5398 0 5397 2 0 2 2 0 8 1
percpumem 16 50 0 1 1 0 1 1 0 8 0
kstatmem 264 24 0 2 2 0 2 2 0 8 0
scxspl 216 5865 0 5865 3 1 2 2 1 8 2
plimitpl 152 40 0 16 2 0 2 2 0 8 0
sigapl 424 443 0 391 7 0 7 7 0 8 0
knotepl 120 53 0 0 2 0 2 2 0 8 0
kqueuepl 224 23 0 14 1 0 1 1 0 8 0
pipepl 344 115 0 88 3 0 3 3 0 8 0
fdescpl 528 427 0 394 3 0 3 3 0 8 0
filepl 160 1639 0 1441 12 0 12 12 0 8 1
lockfpl 104 8 0 6 1 0 1 1 0 8 0
lockfspl 48 5 0 3 1 0 1 1 0 8 0
sessionpl 144 22 0 7 1 0 1 1 0 8 0
pgrppl 48 32 0 9 1 0 1 1 0 8 0
ucredpl 104 204 0 186 1 0 1 1 0 8 0
zombiepl 144 394 0 391 1 0 1 1 0 8 0
processpl 1232 443 0 391 5 0 5 5 0 8 0
procpl 664 479 0 421 6 0 6 6 0 8 0
sockpl 752 154 0 125 4 0 4 4 0 8 0
mcl64k 65536 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 126 0 0 16 0 16 16 0 8 0
mcl2k 2048 19 0 0 3 0 3 3 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 174 0 0 11 0 11 11 0 8 0
bufpl 280 2269 0 118 154 0 154 154 0 8 0
anonpl 32 5133 0 0 42 0 42 42 0 246 0
amapchunkpl 152 9127 0 8689 33 0 33 33 0 158 12
amappl16 200 1622 0 1606 5 0 5 5 0 8 3
amappl15 192 10 0 10 1 0 1 1 0 8 1
amappl14 184 5 0 5 1 0 1 1 0 8 1
amappl13 176 395 0 394 1 0 1 1 0 8 0
amappl12 168 752 0 711 3 0 3 3 0 8 0
amappl11 160 4 0 4 1 0 1 1 0 8 1
amappl10 152 47 0 36 1 0 1 1 0 8 0
amappl9 144 255 0 255 1 0 1 1 0 8 1
amappl8 136 33 0 32 1 0 1 1 0 8 0
amappl7 128 74 0 73 1 0 1 1 0 8 0
amappl6 120 260 0 249 1 0 1 1 0 8 0
amappl5 112 82 0 75 1 0 1 1 0 8 0
amappl4 104 359 0 337 1 0 1 1 0 8 0
amappl3 96 1373 0 1275 4 0 4 4 0 8 1
amappl2 88 493 0 441 2 0 2 2 0 8 0
amappl1 80 8717 0 8164 14 0 14 14 0 8 0
amappl 88 2462 0 2313 5 0 5 5 0 92 0
uvmvnodes 80 98 0 0 2 0 2 2 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 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 3 0 0 1 0 1 1 0 8 0
uaddrrnd 24 427 0 394 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 427 0 394 1 0 1 1 0 8 0
vmmpekpl 168 5005 0 4956 3 0 3 3 0 8 0
vmmpepl 168 34920 0 33103 94 0 94 94 0 357 4
vmsppl 488 426 0 392 7 1 6 6 0 8 0
rwobjpl 80 12725 0 11842 22 0 22 22 0 8 0
pdppl 4096 862 0 784 106 10 96 96 0 8 18
pvpl 32 10992 0 0 90 1 89 89 0 265 0
pmappl 256 426 0 392 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 277 0 13 8 0 8 8 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff837cfff0) 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
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682
acpitimer_delay(1) at acpitimer_delay+0x76 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline]
acpitimer_delay(1) at acpitimer_delay+0x76 sys/dev/acpi/acpitimer.c:120
comcnputc(800,6b) at comcnputc+0x29b sys/dev/ic/com.c:1269
cnputc(6b) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(6b) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff833879ad) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833b03e7) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833f1046,ffffffff8333fc7a,52e,ffffffff834071a1) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pagedequeue(fffffd80088bde90) at uvm_pagedequeue+0x2dd sys/uvm/uvm_page.c:1324
uvm_pageclean(fffffd80088bde90) at uvm_pageclean+0x2ad sys/uvm/uvm_page.c:981
end trace frame: 0xffff800031fdcaf0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff837cfff0) 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
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:682
acpitimer_delay(1) at acpitimer_delay+0x76 acpitimer_read sys/dev/acpi/acpitimer.c:142 [inline]
acpitimer_delay(1) at acpitimer_delay+0x76 sys/dev/acpi/acpitimer.c:120
comcnputc(800,6b) at comcnputc+0x29b sys/dev/ic/com.c:1269
cnputc(6b) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(6b) at db_putchar+0x36d sys/ddb/db_output.c:155
kprintf() at kprintf+0x29c5 sys/kern/subr_prf.c:-1
db_printf(ffffffff833879ad) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff833b03e7) at panic+0x103 sys/kern/subr_prf.c:217
__assert(ffffffff833f1046,ffffffff8333fc7a,52e,ffffffff834071a1) at __assert+0x29 sys/kern/subr_prf.c:-1
uvm_pagedequeue(fffffd80088bde90) at uvm_pagedequeue+0x2dd sys/uvm/uvm_page.c:1324
uvm_pageclean(fffffd80088bde90) at uvm_pageclean+0x2ad sys/uvm/uvm_page.c:981
uvm_pagefree(fffffd80088bde90) at uvm_pagefree+0x26 sys/uvm/uvm_page.c:1020
uvm_anfree(fffffd806d430490) at uvm_anfree+0xe9 sys/uvm/uvm_anon.c:112
amap_wipeout(fffffd806df558a0) at amap_wipeout+0x246 sys/uvm/uvm_amap.c:-1
uvm_unmap_detach(ffff800031fdcbf0,0) at uvm_unmap_detach+0x8a sys/uvm/uvm_map.c:1353
uvm_map_teardown(fffffd806cb21400) at uvm_map_teardown+0x360 sys/uvm/uvm_map.c:2525
exit1(ffff8000fffea7e8,0,0,1) at exit1+0x6fc sys/kern/kern_exit.c:260
sys_exit(ffff8000fffea7e8,ffff800031fdcdc0,ffff800031fdcd10) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff800031fdcdc0) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800031fdcdc0) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:775
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x79b933bd5a20, count: -23
ddb{0}> machine ddbcpu 1
Stopped at savectx+0xae: movl $0,%gs:0x688
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7b91bcb6a6a0, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7b91bcb6a6a0, count: -1