uvm_fault(0xfffffd806af12b90, 0x0, 0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff810f1aa8 cs 8 rflags 10207 cr2 0 cpl 0 rsp ffff80002a383910
gsbase 0xffff8000299edff0 kgsbase 0x0
panic: trap type 6, code=0, pc=ffffffff810f1aa8
Starting stack trace...
panic(ffffffff833a53b9) at panic+0x1d0 sys/kern/subr_prf.c:229
kerntrap(ffff80002a383860) at kerntrap+0x30b
alltraps_kern_meltdown() at alltraps_kern_meltdown+0x7b
dt_ioctl_record_stop(ffff800001607000) at dt_ioctl_record_stop+0x108 sys/dev/dt/dt_dev.c:586
dtclose(21e5f,81,2000,ffff80002a2d5cd0) at dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
dtclose(21e5f,81,2000,ffff80002a2d5cd0) at dtclose+0x109 sys/dev/dt/dt_dev.c:232
spec_close(ffff80002a383a10) at spec_close+0x466 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd806ae82468,81,fffffd80097fb340,ffff80002a2d5cd0) at VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806bfb0208,ffff80002a2d5cd0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806bfb0208,ffff80002a2d5cd0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806bfb0208,ffff80002a2d5cd0) at fdrop+0x121 sys/kern/kern_descrip.c:1280
closef(fffffd806bfb0208,ffff80002a2d5cd0) at closef+0x192 sys/kern/kern_descrip.c:1264
fdfree(ffff80002a2d5cd0) at fdfree+0x116 sys/kern/kern_descrip.c:1195
exit1(ffff80002a2d5cd0,0,0,1) at exit1+0x576 sys/kern/kern_exit.c:215
sys_exit(ffff80002a2d5cd0,ffff80002a383d80,ffff80002a383cd0) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a383d80) at syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a383d80) at syscall+0xb17 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fc049ae3d10, count: 242
End of stack trace.
WARNING: SPL NOT LOWERED ON TRAP EXIT 4 0
Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*331868 28758 0 0 0 1 syz-executor
122326 31180 0 0 0x4000000 0 syz-executor
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7741e7336b90, 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}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
*cpu1: uvm_fault(0xfffffd806af12b90, 0x0, 0, 1) -> e
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7741e7336b90, count: -1
ddb{1}> show registers
rdi 0
rsi 0
rbp 0xffff80003c4a1be0
rbx 0
rdx 0
rcx 0xffff80003680afb0
rax 0x2a
r8 0xffff80003c4a1b10
r9 0x1
r10 0x6d8b5e7f4fc4c979
r11 0x9b793173713f8b
r12 0
r13 0xffffffff81121508 Xdoreti+0x18
r14 0
r15 0
rip 0xffffffff812154c7 proc_trampoline+0xc7
cs 0x8
rflags 0x246
rsp 0xffff80003c4a1b60
ss 0x10
proc_trampoline+0xc7: movl $0,%gs:0x688
ddb{1}> show proc
PROC (syz-executor) tid=331868 pid=28758 tcnt=2 stat=onproc
flags process=0 proc=0
runpri=50, usrpri=50, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff80002a2b94d8,0xffff80003680a030
process=0xffff80002a2c39d8 user=0xffff80003c49c000, vmspace=0xfffffd806af12d78
estcpu=36, cpticks=2, pctcpu=0.0, user=1, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
*28758 331868 90222 0 7 0 syz-executor
28758 205581 90222 0 2 0x4000000 syz-executor
76753 162317 49542 0 2 0 syz-executor
76753 144691 49542 0 3 0x4000080 fsleep syz-executor
67569 394013 17522 0 2 0 syz-executor
67569 398172 17522 0 3 0x4000080 kqsel syz-executor
67569 102759 17522 0 3 0x4000080 kqsel syz-executor
44042 292551 27908 0 3 0x80 nanoslp syz-executor
44042 147213 27908 0 3 0x4000080 rest syz-executor
44042 219130 27908 0 3 0x4000080 rest syz-executor
44042 379398 27908 0 3 0x4000080 fsleep syz-executor
31180 190938 20012 0 2 0 syz-executor
31180 122326 20012 0 7 0x4000000 syz-executor
31180 11197 20012 0 3 0x4000000 inode syz-executor
31180 509175 20012 0 3 0x4000000 inode syz-executor
31180 284760 20012 0 3 0x4000000 inode syz-executor
31180 359544 20012 0 2 0x4000000 syz-executor
93611 271144 70828 0 3 0x82 nanoslp syz-executor
37437 129648 1 0 3 0x100083 ttyin getty
90222 81409 70828 0 3 0x82 nanoslp syz-executor
20012 299975 70828 0 3 0x82 nanoslp syz-executor
17522 372731 70828 0 3 0x82 nanoslp syz-executor
49542 523827 70828 0 3 0x82 nanoslp syz-executor
98222 488738 70828 0 3 0x82 nanoslp syz-executor
99059 412479 0 0 3 0x14200 bored sosplice
24535 477551 70828 0 2 0x2 syz-executor
27908 111465 70828 0 3 0x82 nanoslp syz-executor
70828 520406 44411 0 3 0x82 kqread syz-executor
44411 451686 4606 0 3 0x10008a sigsusp ksh
4606 343914 68205 0 3 0x98 kqread sshd-session
68205 279548 62509 0 3 0x92 kqread sshd-session
62509 429834 1 0 3 0x88 kqread sshd
74305 504948 76930 74 3 0x1100092 bpf pflogd
76930 239361 1 0 3 0x80 sbwait pflogd
54551 310463 14864 73 3 0x1100090 kqread syslogd
14864 186717 1 0 3 0x100082 sbwait syslogd
64569 440631 1 0 3 0x100080 kqread resolvd
39833 419935 13057 77 3 0x100092 kqread dhcpleased
96459 390138 13057 77 3 0x100092 kqread dhcpleased
13057 176568 1 0 3 0x80 kqread dhcpleased
66499 217079 0 0 3 0x14200 bored smr
67347 258217 0 0 2 0x14200 zerothread
10965 62272 0 0 3 0x14200 aiodoned aiodoned
47413 72604 0 0 3 0x14200 syncer update
7647 80190 0 0 3 0x14200 cleaner cleaner
5292 26399 0 0 3 0x14200 reaper reaper
23697 318620 0 0 3 0x14200 pgdaemon pagedaemon
52243 121337 0 0 3 0x14200 bored viomb
43786 171672 0 0 3 0x40014200 acpi0 acpi0
80317 296271 0 0 3 0x40014200 idle1
8401 34247 0 0 3 0x14200 bored softnet7
80730 172780 0 0 3 0x14200 bored softnet6
90206 231427 0 0 3 0x14200 bored softnet5
8852 246901 0 0 3 0x14200 bored softnet4
51552 162053 0 0 3 0x14200 bored softnet3
44869 129224 0 0 3 0x14200 bored softnet2
85641 455182 0 0 3 0x14200 bored softnet1
77812 110132 0 0 3 0x14200 netlock softnet0
23472 226867 0 0 2 0x40014200 systqmp
88692 464185 0 0 3 0x14200 bored systq
59313 42781 0 0 3 0x14200 tmoslp softclockmp
70614 208686 0 0 3 0x40014200 tmoslp softclock
42014 192071 0 0 3 0x40014200 idle0
1 265064 0 0 3 0x82 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{1}> show all locks
Process 31180 (syz-executor) thread 0xffff80002a2d5270 (122326)
Process 31180 (syz-executor) thread 0xffff80002a2d57a0 (11197)
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10278 11106K 12369K 166960K 15134 0
pcb 17 22K 25K 166960K 1736 0
rtable 178 13K 14K 166960K 1042 0
pf 42 18K 131091K 166960K 603 0
ifaddr 41 8K 10K 166960K 315 0
ifgroup 67 2K 3K 166960K 572 0
sysctl 4 1K 9K 166960K 44 0
counters 74 37K 38K 166960K 824 0
ioctlops 0 0K 4K 166960K 3077 0
iov 0 0K 32K 166960K 338 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1579 99K 99K 166960K 5408 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 5K 9K 166960K 32 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 1K 166960K 252 0
dirhash 12 2K 2K 166960K 93 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 17 61K 110K 166960K 4724 0
sigio 0 0K 0K 166960K 247 0
proc 74 115K 180K 166960K 1253 0
subproc 72 4K 4K 166960K 148 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 1291 0
in_multi 63 4K 7K 166960K 433 0
ether_multi 1 0K 0K 166960K 71 0
mrt 1 0K 0K 166960K 42 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 265 1182K 1182K 166960K 265 0
exec 0 0K 1K 166960K 1371 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 11 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 260 170K 199K 166960K 43978 0
UVM aobj 76 6K 6K 166960K 84 0
pinsyscall 42 84K 102K 166960K 6159 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 1K 166960K 379 0
NDP 15 0K 2K 166960K 228 0
temp 80 8652K 8908K 166960K 226402 0
kqueue 14 22K 33K 166960K 1047 0
SYN cache 2 8K 16K 166960K 3 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 120 554 0 551 5 4 1 3 0 8 0
rtentry 176 299 0 243 6 2 4 5 0 8 0
unpcb 144 4257 0 4239 21 19 2 6 0 8 1
syncache 336 27 0 27 3 3 0 1 0 8 0
tcpqe 32 11 0 11 6 6 0 1 0 8 0
tcpcb 736 2023 0 2017 25 21 4 8 0 8 2
arp 128 32 0 23 1 0 1 1 0 8 0
inpcb 328 7449 0 7437 52 45 7 15 0 8 5
nd6 144 53 0 41 1 0 1 1 0 8 0
pkpcb 40 88 0 88 5 4 1 1 0 8 1
kcovpl 48 16 0 8 1 0 1 1 0 8 0
mppekey 1024 2 0 2 1 1 0 1 0 8 0
ppxss 1192 319 0 319 5 4 1 1 0 8 1
pppxif 1504 26 0 26 7 6 1 1 0 8 1
pffrag 232 31 0 24 1 0 1 1 0 482 0
pffrnode 88 24 0 18 1 0 1 1 0 8 0
pffrent 40 55 0 48 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 2 0 2 2 1 1 1 0 8 1
pfanchor 1288 4 0 0 1 0 1 1 0 8 0
pfstitem 24 323 0 182 1 0 1 1 0 8 0
pfstkey 128 326 0 185 5 0 5 5 0 8 0
pfstate 384 322 0 183 16 0 16 16 0 8 0
pfrule 1344 93 0 87 2 1 1 2 0 8 0
rttmr 136 12 0 12 7 7 0 1 0 8 0
art_heap8 4096 6 0 3 6 3 3 4 0 8 0
art_heap4 256 1747 0 1491 40 20 20 32 0 8 0
art_table 40 1753 0 1494 6 2 4 6 0 8 0
art_node 32 299 0 252 1 0 1 1 0 8 0
sysvmsgpl 40 48 0 8 1 0 1 1 0 8 0
semupl 112 1 0 1 1 1 0 1 0 8 0
semapl 112 248 0 238 1 0 1 1 0 8 0
shmpl 112 81 0 8 3 0 3 3 0 8 0
dirhash 1024 72 0 55 3 0 3 3 0 8 0
dino2pl 256 10681 0 9153 96 0 96 96 0 8 0
ffsino 296 10681 0 9153 118 0 118 118 0 8 0
nchpl 144 17512 0 16950 64 39 25 64 0 8 0
rtmask 32 48 0 48 9 8 1 1 0 8 1
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 216 5926 0 0 330 0 330 330 0 8 0
namei 1024 68532 0 68529 6 5 1 2 0 8 0
percpumem 16 427 0 375 1 0 1 1 0 8 0
kstatmem 264 392 0 354 4 1 3 4 0 8 0
acpiwqpl 32 3 0 3 1 0 1 1 1 8 1
scsiplug 72 18 0 18 8 7 1 1 0 8 1
scxspl 216 107372 0 107372 20 19 1 8 1 8 1
plimitpl 152 1772 0 1754 1 0 1 1 0 8 0
sigapl 424 5074 0 5020 9 2 7 9 0 8 0
knotepl 120 812 0 0 24 0 24 24 0 8 0
kqueuepl 224 2326 0 2312 22 20 2 5 0 8 1
pipepl 344 958 0 931 25 20 5 13 0 8 2
fdescpl 528 5011 0 4980 3 0 3 3 0 8 0
filepl 160 43252 0 43033 51 35 16 24 0 8 4
lockfpl 104 2174 0 2172 6 5 1 2 0 8 0
lockfspl 48 765 0 763 1 0 1 1 0 8 0
sessionpl 144 55 0 46 1 0 1 1 0 8 0
pgrppl 48 215 0 197 1 0 1 1 0 8 0
ucredpl 104 7665 0 7652 1 0 1 1 0 8 0
zombiepl 144 5434 0 5432 1 0 1 1 0 8 0
processpl 1232 5074 0 5020 6 0 6 6 0 8 0
procpl 664 12759 0 12693 10 3 7 8 0 8 0
sosppl 168 50 0 49 6 5 1 1 0 8 0
sockpl 752 12609 0 12576 84 72 12 23 0 8 7
mcl64k 65536 29 0 0 4 0 4 4 0 8 0
mcl16k 16384 4 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k 9216 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 7 0 0 1 0 1 1 0 8 0
mcl4k 4096 118 0 0 15 1 14 15 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 80 0 0 8 1 7 7 0 8 0
mtagpl 96 8 0 0 1 0 1 1 0 8 0
mbufpl 256 6656 0 0 413 0 413 413 0 8 0
bufpl 280 42797 0 36654 440 0 440 440 0 8 0
anonpl 32 14800 0 0 119 0 119 119 0 246 0
amapchunkpl 152 163418 0 162790 92 53 39 41 0 158 12
amappl16 200 17253 0 17078 119 94 25 34 0 8 8
amappl15 192 5 0 5 3 3 0 1 0 8 0
amappl14 184 176 0 164 1 0 1 1 0 8 0
amappl13 176 4 0 4 1 1 0 1 0 8 0
amappl12 168 5831 0 5800 3 1 2 2 0 8 0
amappl11 160 56 0 41 1 0 1 1 0 8 0
amappl10 152 5 0 5 2 2 0 1 0 8 0
amappl9 144 256 0 254 1 0 1 1 0 8 0
amappl8 136 21 0 18 1 0 1 1 0 8 0
amappl7 128 158 0 145 1 0 1 1 0 8 0
amappl6 120 300 0 296 1 0 1 1 0 8 0
amappl5 112 158 0 148 1 0 1 1 0 8 0
amappl4 104 456 0 437 1 0 1 1 0 8 0
amappl3 96 27814 0 27709 4 0 4 4 0 8 0
amappl2 88 5505 0 5424 2 0 2 2 0 8 0
amappl1 80 33380 0 32787 15 0 15 15 0 8 0
amappl 88 42089 0 41905 5 0 5 5 0 92 0
dma65536 65536 1 0 1 1 1 0 1 0 8 0
dma32768 32768 1 0 1 1 1 0 1 0 8 0
dma8192 8192 3 0 3 3 3 0 1 0 8 0
dma4096 4096 3 0 3 2 2 0 1 0 8 0
dma2048 2048 1 0 1 1 1 0 1 0 8 0
dma1024 1024 6 0 5 1 0 1 1 0 8 0
dma256 256 8 0 8 3 3 0 1 0 8 0
dma128 128 258 0 258 6 6 0 1 0 8 0
dma64 64 7 0 7 2 1 1 1 0 8 1
dma32 32 10 0 10 4 4 0 1 0 8 0
dma16 16 21 0 20 1 0 1 1 0 8 0
aobjpl 72 83 0 8 2 0 2 2 0 8 0
uaddrrnd 24 5012 0 4981 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 5012 0 4981 1 0 1 1 0 8 0
vmmpekpl 168 41781 0 41729 3 0 3 3 0 8 0
vmmpepl 168 321532 0 319334 178 63 115 117 0 357 12
vmsppl 488 5011 0 4981 5 0 5 5 0 8 0
rwobjpl 80 87704 0 80597 166 12 154 154 0 8 5
pdppl 4096 10032 0 9962 148 76 72 86 0 8 2
pvpl 32 24066 0 0 194 1 193 193 0 265 0
pmappl 256 5011 0 4981 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 785 0 142 19 0 19 19 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffffffff837f8ff0) 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(ffffffff83873590) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff83873590) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847
Xsofttty() at Xsofttty+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153
__mp_lock(ffffffff83873590) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff83873590) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165
__mp_acquire_count(ffffffff83873590,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
biowait(fffffd8062de4b30) at biowait+0xc6 sys/kern/vfs_bio.c:1242
bwrite(fffffd8062de4b30) at bwrite+0x2e7 sys/kern/vfs_bio.c:754
ffs_write(ffff800036803950) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377
end trace frame: 0xffff8000368039c0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff837f8ff0) 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(ffffffff83873590) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff83873590) at __mp_lock+0x192 sys/kern/kern_lock.c:165
softintr_dispatch(2) at softintr_dispatch+0x125 sys/kern/kern_softintr.c:83
dosoftint(2) at dosoftint+0x54 sys/arch/amd64/amd64/intr.c:847
Xsofttty() at Xsofttty+0x27
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c kd_curproc sys/dev/kcov.c:584 [inline]
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0x2c sys/dev/kcov.c:153
__mp_lock(ffffffff83873590) at __mp_lock+0x1a3 __mp_lock_spin sys/kern/kern_lock.c:134 [inline]
__mp_lock(ffffffff83873590) at __mp_lock+0x1a3 sys/kern/kern_lock.c:165
__mp_acquire_count(ffffffff83873590,1) at __mp_acquire_count+0x58 sys/kern/kern_lock.c:-1
sleep_finish(ffffffffffffffff,1) at sleep_finish+0x2d8 sys/kern/kern_synch.c:367
biowait(fffffd8062de4b30) at biowait+0xc6 sys/kern/vfs_bio.c:1242
bwrite(fffffd8062de4b30) at bwrite+0x2e7 sys/kern/vfs_bio.c:754
ffs_write(ffff800036803950) at ffs_write+0x810 sys/ufs/ffs/ffs_vnops.c:377
VOP_WRITE(fffffd806ae821e0,ffff800036803b08,7,fffffd80097fb340) at VOP_WRITE+0x101 sys/kern/vfs_vops.c:245
vn_write(fffffd806b85b7c0,ffff800036803b08,0) at vn_write+0x1d3 sys/kern/vfs_vnops.c:408
dofilewritev(ffff80002a2d5270,3,ffff800036803b08,0,ffff800036803bc0) at dofilewritev+0x242 sys/kern/sys_generic.c:380
sys_write(ffff80002a2d5270,ffff800036803c70,ffff800036803bc0) at sys_write+0xa2 sys/kern/sys_generic.c:300
syscall(ffff800036803c70) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800036803c70) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:746
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd2198d79c70, count: -20
ddb{0}> machine ddbcpu 1
Stopped at proc_trampoline+0xc7: movl $0,%gs:0x688
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7741e7336b90, count: 14
ddb{1}> trace
proc_trampoline() at proc_trampoline+0xc7
end of kernel
end trace frame: 0x7741e7336b90, count: -1