login: panic: kernel diagnostic assertion "type != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/subr_witness.c", line 1490
Stopped at db_enter+0x1c: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
463623 96885 0 0 0 0 syz-executor.3
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827a15bc) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff8281ff28,ffffffff82801845,5d2,ffffffff82831a30) at __assert+0x29 sys/kern/subr_prf.c:157
enroll(0,0,ffffffff82bb90e0) at enroll+0x62e sys/kern/subr_witness.c:1500
witness_lock(fffffd806f00e0e8,8) at witness_lock+0xf2 sys/kern/subr_witness.c:1147
mtx_enter_try(fffffd806f00e0d8) at mtx_enter_try+0x104
mtx_enter(fffffd806f00e0d8) at mtx_enter+0x7f sys/kern/kern_lock.c:266
knote_remove(ffff80002124ba98,fffffd806f00e0d8,fffffd806f00e160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881
knote_fdclose(ffff80002124ba98,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934
fdfree(ffff80002124ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196
exit1(ffff80002124ba98,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206
sys_exit(ffff80002124ba98,ffff8000213c9310,ffff8000213c9360) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff8000213c93e0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000213c93e0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x78acde1b8650, count: 1
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
*cpu1: kernel diagnostic assertion "type != NULL" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/subr_witness.c", line 1490
ddb{1}> trace
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827a15bc) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff8281ff28,ffffffff82801845,5d2,ffffffff82831a30) at __assert+0x29 sys/kern/subr_prf.c:157
enroll(0,0,ffffffff82bb90e0) at enroll+0x62e sys/kern/subr_witness.c:1500
witness_lock(fffffd806f00e0e8,8) at witness_lock+0xf2 sys/kern/subr_witness.c:1147
mtx_enter_try(fffffd806f00e0d8) at mtx_enter_try+0x104
mtx_enter(fffffd806f00e0d8) at mtx_enter+0x7f sys/kern/kern_lock.c:266
knote_remove(ffff80002124ba98,fffffd806f00e0d8,fffffd806f00e160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881
knote_fdclose(ffff80002124ba98,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934
fdfree(ffff80002124ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196
exit1(ffff80002124ba98,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206
sys_exit(ffff80002124ba98,ffff8000213c9310,ffff8000213c9360) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff8000213c93e0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000213c93e0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x78acde1b8650, count: -14
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000213c8ea0
rbx 0xffff800020d59b9f
rdx 0x3fd
rcx 0
rax 0x89
r8 0x101010101010101
r9 0x8080808080808080
r10 0x263a091754090643
r11 0x459b24365493a29f
r12 0xffff800020d599a0
r13 0
r14 0
r15 0x1
rip 0xffffffff81508bec db_enter+0x1c
cs 0x8
rflags 0x246
rsp 0xffff8000213c8e90
ss 0x10
db_enter+0x1c: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.4) pid=171807 stat=onproc
flags process=1008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
pri=0, usrpri=76, nice=20
forw=0xffffffffffffffff, list=0xffff80002124a558,0xffff80002124bd50
process=0xffff80002129e198 user=0xffff8000213c4000, vmspace=0xfffffd8069026020
estcpu=36, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
96885 463623 25683 0 7 0 syz-executor.3
96885 310313 25683 0 3 0x4000080 fsleep syz-executor.3
45306 61421 9617 0 2 0 syz-executor.2
45306 167200 9617 0 3 0x4000080 fsleep syz-executor.2
78964 489986 0 0 3 0x14200 bored sosplice
25683 134399 87392 0 3 0x82 nanoslp syz-executor.3
87341 294942 87392 0 3 0x2 biowait syz-executor.5
72973 394151 87392 0 3 0x82 nanoslp syz-executor.6
61454 306003 87392 0 3 0x82 nanoslp syz-executor.7
66353 135044 87392 0 3 0x82 nanoslp syz-executor.4
91547 86701 87392 0 3 0x82 nanoslp syz-executor.1
9617 283079 87392 0 3 0x82 nanoslp syz-executor.2
95752 168390 87392 0 2 0x2 syz-executor.0
87392 492799 88848 0 3 0x2000082 thrsleep syz-execprog
87392 324284 88848 0 3 0x6000082 thrsleep syz-execprog
87392 438071 88848 0 3 0x6000082 thrsleep syz-execprog
87392 378357 88848 0 3 0x6000082 thrsleep syz-execprog
87392 488443 88848 0 3 0x6000082 wait syz-execprog
87392 120751 88848 0 3 0x6000082 wait syz-execprog
87392 451243 88848 0 3 0x6000082 wait syz-execprog
87392 189978 88848 0 3 0x6000082 wait syz-execprog
87392 105904 88848 0 3 0x6000082 thrsleep syz-execprog
87392 153339 88848 0 3 0x6000082 wait syz-execprog
87392 176312 88848 0 3 0x6000082 thrsleep syz-execprog
87392 474952 88848 0 3 0x6000082 wait syz-execprog
87392 51999 88848 0 3 0x6000082 wait syz-execprog
87392 281194 88848 0 3 0x6000082 wait syz-execprog
87392 230556 88848 0 3 0x6000082 kqread syz-execprog
87392 416553 88848 0 3 0x6000082 thrsleep syz-execprog
88848 45817 7784 0 3 0x10008a sigsusp ksh
7784 229200 27374 0 3 0x9a kqread sshd
12869 376612 1 0 3 0x100083 ttyin getty
27374 251909 1 0 3 0x88 kqread sshd
66228 442428 34524 74 3 0x1100092 bpf pflogd
34524 145532 1 0 3 0x80 netio pflogd
94726 125851 81575 73 3 0x1100090 kqread syslogd
81575 328776 1 0 3 0x100082 netio syslogd
44435 32408 1 0 3 0x100080 kqread resolvd
83512 304621 17444 77 3 0x100092 kqread dhcpleased
37313 232668 17444 77 3 0x100092 kqread dhcpleased
17444 438408 1 0 3 0x80 kqread dhcpleased
1227 409576 0 0 3 0x14200 bored smr
56189 279341 0 0 2 0x14200 zerothread
7010 145698 0 0 3 0x14200 aiodoned aiodoned
52481 159899 0 0 3 0x14200 syncer update
95403 369639 0 0 3 0x14200 cleaner cleaner
64156 392878 0 0 2 0x14200 reaper
26616 296455 0 0 3 0x14200 pgdaemon pagedaemon
84713 109270 0 0 3 0x14200 bored viomb
58368 124683 0 0 3 0x40014200 acpi0 acpi0
37225 447361 0 0 3 0x40014200 idle1
60275 151407 0 0 3 0x14200 bored softnet3
2877 318098 0 0 3 0x14200 bored softnet2
64856 197702 0 0 3 0x14200 bored softnet1
44634 199789 0 0 3 0x14200 bored softnet0
83829 214648 0 0 3 0x14200 bored systqmp
84377 395280 0 0 3 0x14200 bored systq
73343 414381 0 0 3 0x40014200 bored softclock
38779 450926 0 0 3 0x40014200 idle0
1 239516 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 87341 (syz-executor.5) thread 0xffff800021224000 (294942)
exclusive rrwlock inode r = 0 (0xfffffd807b33e918)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:564
#5 vget+0x200 sys/kern/vfs_subr.c:676
#6 ufs_ihashget+0x121 sys/ufs/ufs/ufs_ihash.c:119
#7 ffs_vget+0x7c sys/ufs/ffs/ffs_vfsops.c:1314
#8 ufs_lookup+0x13ba sys/ufs/ufs/ufs_lookup.c:487
#9 VOP_LOOKUP+0x5c sys/kern/vfs_vops.c:85
#10 vfs_lookup+0x6e2 sys/kern/vfs_lookup.c:566
#11 namei+0x55a sys/kern/vfs_lookup.c:250
#12 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847
#13 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#13 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#14 Xsyscall+0x128
exclusive rrwlock inode r = 0 (0xfffffd80696e9b48)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 rrw_enter+0x8c sys/kern/kern_rwlock.c:464
#3 VOP_LOCK+0x8b sys/kern/vfs_vops.c:518
#4 vn_lock+0x84 sys/kern/vfs_vnops.c:564
#5 vfs_lookup+0xd5 sys/kern/vfs_lookup.c:418
#6 namei+0x55a sys/kern/vfs_lookup.c:250
#7 dounlinkat+0x9d sys/kern/vfs_syscalls.c:1847
#8 syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
#8 syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
#9 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10187 6474K 6474K 78643K 11265 0
pcb 13 8K 8K 78643K 13 0
rtable 234 6K 6K 78643K 356 0
pf 32 9K 10K 78643K 43 0
ifaddr 45 15K 15K 78643K 47 0
ifgroup 55 2K 2K 78643K 55 0
counters 60 35K 35K 78643K 60 0
ioctlops 0 0K 4K 78643K 1483 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 4 0
vnodes 1176 74K 74K 78643K 1192 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 1K 78643K 2 0
VM map 2 1K 1K 78643K 2 0
sem 2 0K 0K 78643K 2 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 13 45K 89K 78643K 414 0
proc 67 91K 115K 78643K 526 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
in_multi 99 7K 7K 78643K 99 0
ether_multi 1 0K 0K 78643K 1 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 25 122K 122K 78643K 25 0
exec 0 0K 1K 78643K 393 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 8 62K 64K 78643K 10 0
UVM amap 248 75K 75K 78643K 5860 0
UVM aobj 3 2K 2K 78643K 3 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
NDP 12 0K 2K 78643K 28 0
temp 1 5904K 5968K 78643K 4834 0
kqueue 13 20K 26K 78643K 307 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> 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 37 0 34 1 0 1 1 0 8 0
rtentry 112 111 0 1 4 0 4 4 0 8 0
unpcb 144 317 0 300 1 0 1 1 0 8 0
syncache 304 5 0 5 1 1 0 1 0 8 0
tcpqe 32 136 0 136 1 1 0 1 0 8 0
tcpcb 808 8 0 5 1 0 1 1 0 8 0
arp 120 18 0 0 1 0 1 1 0 8 0
inpcb 368 348 0 339 2 0 2 2 0 8 1
nd6 136 24 0 0 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
pfstitem 24 20 0 0 1 0 1 1 0 8 0
pfstkey 128 20 0 0 1 0 1 1 0 8 0
pfstate 376 20 0 0 2 0 2 2 0 8 0
pfrule 1344 21 0 16 2 1 1 2 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 32 454 0 0 4 0 4 4 0 8 0
art_node 16 110 0 10 1 0 1 1 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 1776 0 328 91 0 91 91 0 8 0
ffsino 272 1776 0 328 97 0 97 97 0 8 0
nchpl 144 2311 0 624 63 0 63 63 0 8 0
uvmvnodes 80 1790 0 0 37 0 37 37 0 8 0
vnodes 216 1790 0 0 100 0 100 100 0 8 0
namei 1024 7457 0 7457 2 0 2 2 0 8 2
percpumem 16 43 0 0 1 0 1 1 0 8 0
kstatmem 264 24 0 0 2 0 2 2 0 8 0
scxspl 216 8085 0 8084 3 2 1 2 1 8 0
plimitpl 152 35 0 19 1 0 1 1 0 8 0
sigapl 424 745 0 698 8 1 7 7 0 8 1
futexpl 64 1441 0 1439 1 0 1 1 0 8 0
knotepl 120 114 0 0 4 0 4 4 0 8 0
kqueuepl 216 303 0 294 1 0 1 1 0 8 0
pipepl 320 147 0 119 3 0 3 3 0 8 0
fdescpl 496 727 0 701 5 0 5 5 0 8 0
filepl 152 2568 0 2430 6 0 6 6 0 8 0
lockfpl 104 6 0 4 1 0 1 1 0 8 0
lockfspl 48 4 0 2 1 0 1 1 0 8 0
sessionpl 144 26 0 9 1 0 1 1 0 8 0
pgrppl 48 26 0 9 1 0 1 1 0 8 0
ucredpl 104 71 0 59 1 0 1 1 0 8 0
zombiepl 144 702 0 698 1 0 1 1 0 8 0
processpl 1072 745 0 698 4 0 4 4 0 8 0
procpl 680 1043 0 978 7 1 6 6 0 8 0
sosppl 168 282 0 277 1 0 1 1 0 8 0
sockpl 488 702 0 670 5 0 5 5 0 8 1
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 272 0 0 34 0 34 34 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 284 0 0 18 0 18 18 0 8 0
bufpl 288 4448 0 138 308 0 308 308 0 8 0
anonpl 24 216235 0 211664 60 2 58 59 0 186 28
amapchunkpl 152 19093 0 18502 28 0 28 28 0 158 3
amappl16 200 5874 0 5804 5 0 5 5 0 8 0
amappl15 192 35 0 35 1 1 0 1 0 8 0
amappl14 184 191 0 178 2 0 2 2 0 8 1
amappl13 176 11 0 10 1 0 1 1 0 8 0
amappl12 168 1426 0 1398 3 1 2 2 0 8 0
amappl11 160 68 0 53 1 0 1 1 0 8 0
amappl10 152 43 0 33 1 0 1 1 0 8 0
amappl9 144 207 0 207 1 0 1 1 0 8 1
amappl8 136 148 0 119 2 0 2 2 0 8 0
amappl7 128 72 0 62 2 0 2 2 0 8 0
amappl6 120 238 0 219 2 0 2 2 0 8 1
amappl5 112 175 0 164 1 0 1 1 0 8 0
amappl4 104 638 0 591 3 0 3 3 0 8 1
amappl3 96 4180 0 4108 4 1 3 3 0 8 0
amappl2 88 979 0 914 3 0 3 3 0 8 1
amappl1 80 12012 0 11467 23 2 21 23 0 8 8
amappl 88 5339 0 5173 5 0 5 5 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 2 0 0 1 0 1 1 0 8 0
uaddrrnd 24 727 0 701 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 727 0 701 1 0 1 1 0 8 0
vmmpekpl 168 11546 0 11513 2 0 2 2 0 8 0
vmmpepl 168 61153 0 59487 117 0 117 117 0 357 39
vmsppl 464 726 0 701 5 0 5 5 0 8 1
rwobjpl 56 25283 0 22455 48 1 47 47 0 8 6
pdppl 4096 1462 0 1402 100 30 70 82 0 8 10
pvpl 32 465210 0 455421 356 10 346 355 0 265 259
pmappl 248 726 0 701 3 0 3 3 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 698 0 33 20 0 20 20 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp
x86_ipi_db(ffffffff82bf2ff0) at x86_ipi_db+0x1e 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+0x27
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 sys/kern/kern_lock.c:147
intr_handler(ffff8000213bd900,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff8000213bdad0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000213bdad0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb0d1fffbd0, count: 6
ddb{0}> trace
x86_ipi_db(ffffffff82bf2ff0) at x86_ipi_db+0x1e 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+0x27
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 sys/kern/kern_lock.c:147
intr_handler(ffff8000213bd900,ffff80000006bc00) at intr_handler+0x62 sys/arch/amd64/amd64/intr.c:532
Xintr_ioapic_edge23_untramp() at Xintr_ioapic_edge23_untramp+0x18f
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82d01718) at __mp_lock+0x122 sys/kern/kern_lock.c:147
syscall(ffff8000213bdad0) at syscall+0x5cd mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000213bdad0) at syscall+0x5cd sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x6fb0d1fffbd0, count: -9
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x1c: addq $0x8,%rsp
db_enter() at db_enter+0x1c sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff827a15bc) at panic+0x17b sys/kern/subr_prf.c:198
__assert(ffffffff8281ff28,ffffffff82801845,5d2,ffffffff82831a30) at __assert+0x29 sys/kern/subr_prf.c:157
enroll(0,0,ffffffff82bb90e0) at enroll+0x62e sys/kern/subr_witness.c:1500
witness_lock(fffffd806f00e0e8,8) at witness_lock+0xf2 sys/kern/subr_witness.c:1147
mtx_enter_try(fffffd806f00e0d8) at mtx_enter_try+0x104
mtx_enter(fffffd806f00e0d8) at mtx_enter+0x7f sys/kern/kern_lock.c:266
knote_remove(ffff80002124ba98,fffffd806f00e0d8,fffffd806f00e160,3,0) at knote_remove+0x20d sys/kern/kern_event.c:1881
knote_fdclose(ffff80002124ba98,3) at knote_fdclose+0xae sys/kern/kern_event.c:1934
fdfree(ffff80002124ba98) at fdfree+0xdf sys/kern/kern_descrip.c:1196
exit1(ffff80002124ba98,0,0,1) at exit1+0x3ff sys/kern/kern_exit.c:206
sys_exit(ffff80002124ba98,ffff8000213c9310,ffff8000213c9360) at sys_exit+0x1a sys/kern/kern_exit.c:89
syscall(ffff8000213c93e0) at syscall+0x5e2 mi_syscall sys/sys/syscall_mi.h:110 [inline]
syscall(ffff8000213c93e0) at syscall+0x5e2 sys/arch/amd64/amd64/trap.c:623
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x78acde1b8650, count: 1
ddb{1}>