*cpu0: uvm_fault(0xfffff7806cff07c8, 0x1000001d8, 0, 1) -> e
ddb{1}> show kasan
No such command
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7eb88a557b80, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff800038f9c2d0
rbx 0
rdx 0
rcx 0xffff80002a22bca0
rax 0x3c
r8 0xffff800038f9c200
r9 0
r10 0x3ae47223cbcff1bd
r11 0xe2c625b605d81391
r12 0
r13 0
r14 0xffff80002a22bca0
r15 0
rip 0xffffffff8314c3ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff800038f9c250
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{1}> show proc
PROC (syz-executor) tid=171735 pid=21796 tcnt=2 stat=onproc
flags process=10<SUGID> proc=0
runpri=53, usrpri=53, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a22a018,0xffff80002a22a7f0
process=0xffff800045fe49d0 user=0xffff800038f97000, vmspace=0xfffff7806d1ae7c0
estcpu=3, cpticks=3, pctcpu=0.2, user=1, sys=2, intr=0
ddb{1}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
54543 277531 94411 0 7 0x2 0 syz-executor
56689 5458 29881 32767 2 0x10 0 syz-executor
56689 273338 29881 32767 3 0x10 0x4000080 kqsel syz-executor
57376 488614 33638 32767 2 0x10 0 syz-executor
57376 453346 33638 32767 2 0x10 0x4000000 syz-executor
*21796 171735 43476 32767 7 0x10 0 syz-executor
21796 65325 43476 32767 3 0x10 0x4000080 fsleep syz-executor
84256 303068 40055 32767 2 0x10 0 syz-executor
84256 465881 40055 32767 3 0x10 0x4000080 fsleep syz-executor
84256 391146 40055 32767 3 0x10 0x4000080 fsleep syz-executor
35126 415950 23530 32767 2 0x10 0 syz-executor
35126 190012 23530 32767 3 0x10 0x4000080 fsleep syz-executor
29881 419447 11997 32767 3 0x10 0x80 nanoslp syz-executor
23530 91155 94019 32767 3 0x10 0x80 nanoslp syz-executor
40055 279467 72523 32767 3 0x10 0x80 nanoslp syz-executor
33638 331497 22800 32767 3 0x10 0x80 nanoslp syz-executor
43476 14808 49525 32767 3 0x10 0x80 nanoslp syz-executor
22800 207239 94411 0 3 0x2 0x80 wait syz-executor
11997 429349 94411 0 3 0x2 0x80 wait syz-executor
83825 479475 94411 0 3 0x2 0x80 wait syz-executor
24661 339716 94411 0 3 0x2 0x80 wait syz-executor
49525 402417 94411 0 3 0x2 0x80 wait syz-executor
94019 11100 94411 0 3 0x2 0x80 wait syz-executor
72523 347924 94411 0 3 0x2 0x80 wait syz-executor
94411 114546 69175 0 3 0x2 0x80 kqread syz-executor
69175 19758 60221 0 3 0x100002 0x88 sigsusp ksh
60221 194632 44660 0 3 0x10 0x88 kqread sshd-session
44660 200015 35924 0 3 0x12 0x80 kqread sshd-session
55887 198287 1 0 3 0x100003 0x80 ttyin getty
35924 261004 1 0 3 0 0x88 kqread sshd
78618 167402 37147 73 3 0x1100010 0x80 kqread syslogd
37147 182459 1 0 3 0x100002 0x80 sbwait syslogd
81786 273480 1 0 3 0x100000 0x80 kqread resolvd
41191 153157 62947 77 3 0x100012 0x80 kqread dhcpleased
27967 512789 62947 77 3 0x100012 0x80 kqread dhcpleased
62947 507020 1 0 3 0 0x80 kqread dhcpleased
36619 59188 0 0 3 0x14000 0x200 bored smr
17144 229478 0 0 2 0x14000 0x200 zerothread
32333 392496 0 0 3 0x14000 0x200 aiodoned aiodoned
93319 235829 0 0 3 0x14000 0x200 syncer update
97863 436410 0 0 3 0x14000 0x200 cleaner cleaner
27688 421780 0 0 3 0x14000 0x200 reaper reaper
43343 181153 0 0 3 0x14000 0x200 pgdaemon pagedaemon
50138 8874 0 0 3 0x14000 0x200 bored viomb
84884 36418 0 0 3 0x14000 0x40000200 acpi0 acpi0
19914 340819 0 0 3 0x14000 0x40000200 idle1
81141 36042 0 0 3 0x14000 0x200 bored softnet1
26457 95252 0 0 3 0x14000 0x200 bored softnet0
73031 390077 0 0 3 0x14000 0x200 smrbar systqmp
9273 237637 0 0 3 0x14000 0x200 bored systq
9977 497543 0 0 3 0x14000 0x200 tmoslp softclockmp
33911 180098 0 0 3 0x14000 0x40000200 tmoslp softclock
40573 157674 0 0 3 0x14000 0x40000200 idle0
1 63338 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff7806cfef710)
#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_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173
#3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline]
#3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202
#4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#6 Xsyscall+0x128
Process 54543 (syz-executor) thread 0xffff800045fe2a88 (277531)
shared rwlock amaplk r = 0 (0xfffff7806c965d98)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvm_fault_check+0x8a9 sys/uvm/uvm_fault.c:834
#3 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#4 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194
#5 usertrap+0x430 sys/arch/amd64/amd64/trap.c:648
#6 recall_trap+0x8
shared rwlock vmmaplk r = 0 (0xfffff7806cff08c8)
#0 witness_lock+0x5f1 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5f1 sys/kern/subr_witness.c:1160
#1 rw_do_enter_read+0x3e8 sys/kern/kern_rwlock.c:413
#2 uvmfault_lookup+0x122 sys/uvm/uvm_fault.c:1880
#3 uvm_fault_check+0x4f sys/uvm/uvm_fault.c:693
#4 uvm_fault+0x106 sys/uvm/uvm_fault.c:627
#5 upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194
#6 usertrap+0x430 sys/arch/amd64/amd64/trap.c:648
#7 recall_trap+0x8
Process 21796 (syz-executor) thread 0xffff80002a22bca0 (171735)
exclusive rwlock uobjlk r = 0 (0xfffff7806d4ff468)
#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 uvm_map_protect+0xb36 sys/uvm/uvm_map.c:3202
#3 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#4 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#5 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffff7806d1ae8c0)
#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 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5170
#3 uvm_map_protect+0xe0 sys/uvm/uvm_map.c:3075
#4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#6 Xsyscall+0x128
exclusive mutex &pmap->pm_mtx r = 0 (0xfffff7806cfef710)
#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_write_protect+0x80 rcr3 sys/arch/amd64/compile/SYZKALLER/obj/machine/cpufunc.h:139 [inline]
#2 pmap_write_protect+0x80 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:441 [inline]
#2 pmap_write_protect+0x80 sys/arch/amd64/amd64/pmap.c:2173
#3 uvm_map_protect+0xb95 pmap_protect sys/arch/amd64/compile/SYZKALLER/obj/machine/pmap.h:481 [inline]
#3 uvm_map_protect+0xb95 sys/uvm/uvm_map.c:3202
#4 sys_mprotect+0x351 sys/uvm/uvm_mmap.c:590
#5 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#6 Xsyscall+0x128
Process 73031 (systqmp) thread 0xffff800045ffe000 (390077)
shared rwlock systqmp r = 0 (0xffffffff838f7b48)
#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 11044 12015K 12034K 166960K 12138 0
pcb 17 12K 12K 166960K 17 0
rtable 215 6K 7K 166960K 347 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 4K 166960K 30 0
iov 0 0K 8K 166960K 1 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1287 81K 81K 166960K 1353 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 1K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 4 0K 0K 166960K 5 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 22 78K 125K 166960K 153 0
proc 58 99K 163K 166960K 496 0
subproc 63 3K 4K 166960K 72 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 5K 6K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 2 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 43 201K 201K 166960K 43 0
exec 0 0K 1K 166960K 357 0
fusefs mount 1 32K 32K 166960K 1 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 226 175K 184K 166960K 2981 0
UVM aobj 3 2K 2K 166960K 3 0
pinsyscall 43 86K 113K 166960K 1225 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 24 1K 2K 166960K 27 0
temp 30 9113K 9120K 166960K 3342 0
kqueue 14 22K 22K 166960K 29 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 28 0 0 1 0 1 1 0 8 0
rtpcb 120 34 0 31 1 0 1 1 0 8 0
rtentry 176 111 0 12 5 0 5 5 0 8 0
unpcb 144 50 0 35 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 47 0 43 4 0 4 4 0 8 3
arp 136 18 0 2 1 0 1 1 0 8 0
inpcb 328 147 0 136 7 0 7 7 0 8 5
nd6 152 24 0 3 1 0 1 1 0 8 0
kcovpl 48 8 0 1 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 453 0 0 29 0 29 29 0 8 0
art_table 40 454 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 72 2 0 0 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1567 0 101 92 0 92 92 0 8 0
ffsino 296 1567 0 101 113 0 113 113 0 8 0
nchpl 144 1770 0 72 63 0 63 63 0 8 0
vnodes 216 1648 0 0 92 0 92 92 0 8 0
namei 1024 5853 0 5853 4 1 3 3 0 8 3
percpumem 16 51 0 1 1 0 1 1 0 8 0
kstatmem 264 25 0 2 2 0 2 2 0 8 0
scxspl 216 6150 0 6150 4 2 2 3 1 8 2
plimitpl 152 38 0 14 1 0 1 1 0 8 0
sigapl 424 442 0 392 7 0 7 7 0 8 1
knotepl 120 293 0 0 9 0 9 9 0 8 0
kqueuepl 224 27 0 16 1 0 1 1 0 8 0
pipepl 344 124 0 97 3 0 3 3 0 8 0
fdescpl 528 426 0 392 4 0 4 4 0 8 0
filepl 160 1564 0 1357 12 0 12 12 0 8 2
lockfpl 104 13 0 9 1 0 1 1 0 8 0
lockfspl 48 7 0 3 1 0 1 1 0 8 0
sessionpl 144 23 0 8 1 0 1 1 0 8 0
pgrppl 48 32 0 9 1 0 1 1 0 8 0
ucredpl 104 122 0 104 1 0 1 1 0 8 0
zombiepl 144 394 0 392 1 0 1 1 0 8 0
processpl 1240 442 0 392 5 0 5 5 0 8 0
procpl 664 470 0 414 6 0 6 6 0 8 0
sockpl 752 231 0 201 10 0 10 10 0 8 6
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 111 0 0 14 0 14 14 0 8 0
mcl2k 2048 19 0 0 3 0 3 3 0 8 0
mextrefs 64 15 0 0 1 0 1 1 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 173 0 0 11 0 11 11 0 8 0
bufpl 272 2237 0 102 143 0 143 143 0 8 0
anonpl 32 3477 0 0 28 0 28 28 0 247 0
amapchunkpl 152 8044 0 7550 23 0 23 23 0 158 1
amappl16 200 1496 0 1481 5 0 5 5 0 8 4
amappl15 192 5 0 5 2 1 1 1 0 8 1
amappl14 184 405 0 403 1 0 1 1 0 8 0
amappl13 176 113 0 103 1 0 1 1 0 8 0
amappl12 168 657 0 624 2 0 2 2 0 8 0
amappl11 160 2 0 2 1 0 1 1 0 8 1
amappl10 152 71 0 61 1 0 1 1 0 8 0
amappl9 144 267 0 267 1 0 1 1 0 8 1
amappl8 136 90 0 89 1 0 1 1 0 8 0
amappl7 128 140 0 129 1 0 1 1 0 8 0
amappl6 120 152 0 151 1 0 1 1 0 8 0
amappl5 112 93 0 86 1 0 1 1 0 8 0
amappl4 104 275 0 261 1 0 1 1 0 8 0
amappl3 96 1439 0 1346 4 1 3 3 0 8 0
amappl2 88 534 0 460 2 0 2 2 0 8 0
amappl1 80 10033 0 9475 13 0 13 13 0 8 0
amappl 88 2315 0 2153 5 0 5 5 0 92 0
uvmvnodes 80 96 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 426 0 392 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 426 0 392 1 0 1 1 0 8 0
vmmpekpl 168 5396 0 5354 2 0 2 2 0 8 0
vmmpepl 168 36427 0 34538 93 0 93 93 0 357 4
vmsppl 488 425 0 392 7 1 6 6 0 8 1
rwobjpl 80 13721 0 12816 22 1 21 21 0 8 0
pdppl 4096 859 0 784 107 10 97 97 0 8 22
pvpl 32 9680 0 0 79 0 79 79 0 265 0
pmappl 256 425 0 392 4 1 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 420 0 14 12 0 12 12 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff83934ff0) 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_write_1(3f8,0,20) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:797
comcnputc(800,20) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline]
comcnputc(800,20) at comcnputc+0x1ab sys/dev/ic/com.c:1268
cnputc(20) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(70) at db_putchar+0x182 db_force_whitespace sys/ddb/db_output.c:-1 [inline]
db_putchar(70) at db_putchar+0x182 sys/ddb/db_output.c:153
kprintf() at kprintf+0x2a75 sys/kern/subr_prf.c:-1
db_printf(ffffffff834b9a26) at db_printf+0x9b sys/kern/subr_prf.c:-1
db_ktrap(6,0,ffff80003c3eef40) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline]
db_ktrap(6,0,ffff80003c3eef40) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128
kerntrap(ffff80003c3eef40) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:523
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
amap_lookups(fffff7806c94d210,11000,ffff80003c3ef130,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:120 [inline]
amap_lookups(fffff7806c94d210,11000,ffff80003c3ef130,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1170
uvm_fault_check(ffff80003c3ef230,ffff80003c3ef268,ffff80003c3ef2a0,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
end trace frame: 0xffff80003c3ef300, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff83934ff0) 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_write_1(3f8,0,20) at x86_bus_space_io_write_1+0x40 sys/arch/amd64/amd64/bus_space.c:797
comcnputc(800,20) at comcnputc+0x1ab bus_space_barrier sys/dev/ic/com.c:-1 [inline]
comcnputc(800,20) at comcnputc+0x1ab sys/dev/ic/com.c:1268
cnputc(20) at cnputc+0x67 sys/dev/cons.c:218
db_putchar(70) at db_putchar+0x182 db_force_whitespace sys/ddb/db_output.c:-1 [inline]
db_putchar(70) at db_putchar+0x182 sys/ddb/db_output.c:153
kprintf() at kprintf+0x2a75 sys/kern/subr_prf.c:-1
db_printf(ffffffff834b9a26) at db_printf+0x9b sys/kern/subr_prf.c:-1
db_ktrap(6,0,ffff80003c3eef40) at db_ktrap+0x1b6 db_printtrap sys/arch/amd64/amd64/db_interface.c:103 [inline]
db_ktrap(6,0,ffff80003c3eef40) at db_ktrap+0x1b6 sys/arch/amd64/amd64/db_interface.c:128
kerntrap(ffff80003c3eef40) at kerntrap+0x243 sys/arch/amd64/amd64/trap.c:523
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
amap_lookups(fffff7806c94d210,11000,ffff80003c3ef130,8) at amap_lookups+0x1e0 amap_chunk_get sys/uvm/uvm_amap.c:120 [inline]
amap_lookups(fffff7806c94d210,11000,ffff80003c3ef130,8) at amap_lookups+0x1e0 sys/uvm/uvm_amap.c:1170
uvm_fault_check(ffff80003c3ef230,ffff80003c3ef268,ffff80003c3ef2a0,0) at uvm_fault_check+0x8d2 sys/uvm/uvm_fault.c:840
uvm_fault(fffff7806cff07c8,9deb211d000,0,1) at uvm_fault+0x106 sys/uvm/uvm_fault.c:627
upageflttrap(ffff80003c3ef3d0,9deb211d514) at upageflttrap+0xa9 sys/arch/amd64/amd64/trap.c:194
usertrap(ffff80003c3ef3d0) at usertrap+0x430 sys/arch/amd64/amd64/trap.c:648
recall_trap() at recall_trap+0x8
end of kernel
end trace frame: 0x74dc1ea2ec90, count: -18
ddb{0}> machine ddbcpu 1
Stopped at savectx+0xae: movl $0,%gs:0x688
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7eb88a557b80, count: 14
ddb{1}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x7eb88a557b80, count: -1