panic: Caught invalid memory access at ffffffff846ec918 size 8 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 20046 1 0 0x10000002 0 1K init
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84638c51) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde sys/kern/subr_kasan.c:1099
witness_checkorder(ffff800028fe4690,9,0) at witness_checkorder+0x25a sys/kern/subr_witness.c:792
mtx_enter(ffff800028fe4680) at mtx_enter+0x105 sys/kern/kern_lock.c:406
kqueue_register(ffff800028fe4680,ffff8000297fe2a0,0,0) at kqueue_register+0x3ab sys/kern/kern_event.c:1445
knote_processfork(ffff8000298034f0,14e84) at knote_processfork+0x5b1 sys/kern/kern_event.c:2286
fork1(ffff800045fffc88,1,ffffffff8235e640,0,ffff8000297fe520,0) at fork1+0x1225 sys/kern/kern_fork.c:511
syscall(ffff8000297fe5c0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000297fe5c0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b223066c480, count: 5
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: Caught invalid memory access at ffffffff846ec918 size 8 op 0
ddb{1}> show kasan
KASAN: invalid read of 8 bytes at 0xffffffff846ec918 from pc 0xffffffff8139efea
KASAN: first bad byte at 0xffffffff846ec918 (+0); shadow 0xfa: global redzone (out-of-bounds)
KASAN: 0xffffffff846ec918 is 17 bytes to the right of the 39-byte global '.str.8' (/syzkaller/managers/kasan/kernel/sys/kern/subr_witness.c)
KASAN: pc: witness_checkorder+0x25a
KASAN: call trace:
#0 __asan_load8_noabort+0xbd kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
#0 __asan_load8_noabort+0xbd sys/kern/subr_kasan.c:1099
#1 witness_checkorder+0x25a sys/kern/subr_witness.c:792
#2 mtx_enter+0x105 sys/kern/kern_lock.c:406
#3 kqueue_register+0x3ab sys/kern/kern_event.c:1445
#4 knote_processfork+0x5b1 sys/kern/kern_event.c:2286
#5 fork1+0x1225 sys/kern/kern_fork.c:511
#6 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#7 Xsyscall+0x128
KASAN: shadow of 0xffffffff846ec800..0xffffffff846eca80 (1 cell = 8 bytes):
0xffffffff846ec800: 00 00 00 00 00 fa fa fa fa fa fa fa 00 00 00 00
0xffffffff846ec880: fa fa fa fa 00 00 00 00 fa fa fa fa 00 00 00 00
>0xffffffff846ec900: 00 fa fa[fa]fa fa fa fa 00 00 00 00 00 fa fa fa
0xffffffff846ec980: fa fa fa fa 00 00 00 00 00 fa fa fa fa fa fa fa
0xffffffff846eca00: 00 00 00 00 00 00 00 00 fa fa fa fa 00 00 00 fa
KASAN: legend: 00 valid; 01..07 partial; fb malloc redzone; fc malloc freed; fd pool freed; fe kmem; fa global; f1..f4/f8 stack/scope
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84638c51) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde sys/kern/subr_kasan.c:1099
witness_checkorder(ffff800028fe4690,9,0) at witness_checkorder+0x25a sys/kern/subr_witness.c:792
mtx_enter(ffff800028fe4680) at mtx_enter+0x105 sys/kern/kern_lock.c:406
kqueue_register(ffff800028fe4680,ffff8000297fe2a0,0,0) at kqueue_register+0x3ab sys/kern/kern_event.c:1445
knote_processfork(ffff8000298034f0,14e84) at knote_processfork+0x5b1 sys/kern/kern_event.c:2286
fork1(ffff800045fffc88,1,ffffffff8235e640,0,ffff8000297fe520,0) at fork1+0x1225 sys/kern/kern_fork.c:511
syscall(ffff8000297fe5c0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000297fe5c0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b223066c480, count: -10
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff8000297fdcd0
rbx 0xffff8000297fdd40
rdx 0
rcx 0xffff800028fe3ff0
rax 0
r8 0x101010101010101
r9 0x8080808080808080
r10 0
r11 0xffffffff815c6a70 x86_bus_space_io_read_1
r12 0xffffffff84638c51 __rodata_start+0x9fc51
r13 0xffff800028fe4c08
r14 0xffff800028fe4e07
r15 0x1
rip 0xffffffff8312f677 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff8000297fdcd0
ss 0x10
db_enter+0x17: popq %rbp
ddb{1}> show proc
PROC (init) tid=20046 pid=1 tcnt=1 stat=onproc
flags process=10000002<EXEC,WAITEVENT> proc=0
runpri=17, usrpri=52, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffffffff85e4c060,0xffff800045fff4d0
process=0xffff8000298034f0 user=0xffff8000297f3000, vmspace=0xffff800000d8a988
estcpu=2, cpticks=5, pctcpu=0.0, user=0, sys=5, intr=0
ddb{1}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
85636 83547 1 0 2 0 0 init
76529 409243 32190 0 2 0 0 syz-executor
76529 100774 32190 0 2 0 0x4000000 syz-executor
4207 158919 79769 0 2 0 0 syz-executor
4207 522546 79769 0 3 0 0x4000080 fsleep syz-executor
60119 503453 53367 0 2 0 0 syz-executor
60119 173612 53367 0 3 0 0x4000080 fsleep syz-executor
31340 339232 44524 0 2 0x10 0 syz-executor
31340 433047 44524 0 3 0x10 0x4000080 fsleep syz-executor
37013 498768 77877 0 2 0 0 syz-executor
37013 238186 77877 0 3 0 0x4000080 fsleep syz-executor
48574 392143 49924 0 2 0 0 syz-executor
48574 456280 49924 0 3 0 0x4000080 kqread syz-executor
48574 237981 49924 0 2 0 0x4000000 syz-executor
90943 299674 57701 0 2 0 0 syz-executor
90943 446477 57701 0 3 0 0x4000080 fsleep syz-executor
11877 118141 0 0 3 0x14000 0x280 nfsidl nfsio
13024 169527 0 0 3 0x14000 0x280 nfsidl nfsio
40544 222000 0 0 3 0x14000 0x280 nfsidl nfsio
9988 482525 0 0 3 0x14000 0x280 nfsidl nfsio
7261 444828 0 0 3 0x14000 0x280 nfsidl nfsio
94733 315207 0 0 3 0x14000 0x280 nfsidl nfsio
21307 373652 0 0 3 0x14000 0x280 nfsidl nfsio
97933 472278 0 0 3 0x14000 0x280 nfsidl nfsio
99523 215100 0 0 3 0x14000 0x280 nfsidl nfsio
71131 401739 0 0 3 0x14000 0x280 nfsidl nfsio
3640 203072 0 0 3 0x14000 0x280 nfsidl nfsio
83656 462822 0 0 3 0x14000 0x280 nfsidl nfsio
42575 473999 0 0 3 0x14000 0x280 nfsidl nfsio
15236 480291 0 0 3 0x14000 0x280 nfsidl nfsio
98424 362825 0 0 3 0x14000 0x280 nfsidl nfsio
58959 316518 0 0 3 0x14000 0x280 nfsidl nfsio
59889 259715 0 0 3 0x14000 0x280 nfsidl nfsio
79888 521223 0 0 3 0x14000 0x280 nfsidl nfsio
19947 1359 0 0 3 0x14000 0x280 nfsidl nfsio
72149 362348 0 0 3 0x14000 0x280 nfsidl nfsio
49924 158681 1385 0 3 0x2 0x80 nanoslp syz-executor
53367 383435 1385 0 3 0x2 0x80 nanoslp syz-executor
79769 129462 1385 0 3 0x2 0x80 nanoslp syz-executor
57701 341696 1385 0 3 0x2 0x80 nanoslp syz-executor
44524 14043 1385 0 3 0x2 0x80 nanoslp syz-executor
32190 445758 1385 0 3 0x2 0x80 nanoslp syz-executor
57054 293180 1385 0 3 0x2 0x80 nanoslp syz-executor
77877 445269 1385 0 2 0x2 0 syz-executor
1385 27517 62827 0 3 0x2 0x80 kqread syz-executor
62827 375807 1 0 2 0x100002 0x88 ksh
1716 208977 35557 74 3 0x1100012 0x80 bpf pflogd
35557 212548 1 0 3 0 0x80 sbwait pflogd
69185 459086 1 77 2 0x100012 0x80 dhcpleased
54736 522540 0 0 2 0x14000 0x40000200 smr
53123 348650 0 0 2 0x14000 0x200 zerothread
74469 55782 0 0 3 0x14000 0x200 aiodoned aiodoned
84519 250768 0 0 3 0x14000 0x200 syncer update
19830 415691 0 0 3 0x14000 0x200 cleaner cleaner
78592 195281 0 0 3 0x14000 0x200 reaper reaper
94002 239113 0 0 3 0x14000 0x200 pgdaemon pagedaemon
38537 406485 0 0 3 0x14000 0x200 bored viomb
56721 279222 0 0 3 0x14000 0x40000200 acpi0 acpi0
73394 331917 0 0 3 0x14000 0x40000200 idle1
65918 485243 0 0 3 0x14000 0x200 bored softnet1
99029 451787 0 0 3 0x14000 0x200 bored softnet0
6806 472507 0 0 3 0x14000 0x200 bored systqmp
23335 287612 0 0 3 0x14000 0x200 bored systq
39993 412947 0 0 3 0x14000 0x200 tmoslp softclockmp
48202 19965 0 0 3 0x14000 0x40000200 tmoslp softclock
15851 193136 0 0 3 0x14000 0x40000200 idle0
* 1 20046 0 0 7 0x10000002 0 init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{1}> show all locks
Process 1 (init) thread 0xffff800045fffc88 (20046)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff8545f080)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 syscall+0x1048 mi_syscall sys/sys/syscall_mi.h:175 [inline]
#1 syscall+0x1048 sys/arch/amd64/amd64/trap.c:783
#2 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 11081 12411K 12412K 166960K 12276 0
pcb 17 24K 24K 166960K 25 0
rtable 239 12K 13K 166960K 353 0
pf 34 22K 22K 166960K 45 0
ifaddr 43 12K 12K 166960K 45 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 3 1K 13K 166960K 9 0
counters 70 42K 42K 166960K 70 0
ioctlops 0 0K 4K 166960K 1489 0
iov 0 0K 16K 166960K 3 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1363 88K 88K 166960K 1476 0
UFS quota 1 36K 36K 166960K 1 0
UFS mount 5 44K 44K 166960K 5 0
shm 2 2K 2K 166960K 2 0
VM map 2 1K 1K 166960K 2 0
sem 5 0K 0K 166960K 5 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 17 65K 93K 166960K 184 0
sigio 0 0K 0K 166960K 8 0
proc 23 62K 193K 166960K 563 0
subproc 72 9K 9K 166960K 72 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 20K 20K 166960K 1 0
in_multi 99 7K 7K 166960K 99 0
ether_multi 1 0K 0K 166960K 1 0
mrt 0 0K 0K 166960K 4 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 49 344K 344K 166960K 49 0
exec 0 0K 2K 166960K 383 0
fusefs mount 1 36K 36K 166960K 1 0
tdb 3 1K 1K 166960K 3 0
VM swap 14 124K 124K 166960K 15 0
UVM amap 158 169K 273K 166960K 3458 0
UVM aobj 4 4K 4K 166960K 4 0
pinsyscall 1050 1712K 1735K 166960K 1341 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
NDP 12 0K 2K 166960K 28 0
temp 34 9162K 9182K 166960K 4067 0
kqueue 6 18K 52K 166960K 37 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 35 0 35 1 0 1 1 0 8 1
rtentry 176 112 0 1 6 0 6 6 0 8 0
unpcb 144 90 0 78 2 0 2 2 0 8 1
syncache 336 4 0 4 2 1 1 1 0 8 1
tcpcb 736 14 0 12 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 96 0 94 2 0 2 2 0 8 1
nd6 152 25 0 0 1 0 1 1 0 8 0
kcovpl 48 8 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 25 0 0 1 0 1 1 0 8 0
pfstkey 128 25 0 0 1 0 1 1 0 8 0
pfstate 448 25 0 0 3 0 3 3 0 8 0
pfrule 1360 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 256 454 0 0 29 0 29 29 0 8 0
art_table 40 455 0 0 5 0 5 5 0 8 0
art_node 32 112 0 11 1 0 1 1 0 8 0
semapl 72 3 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 1655 0 182 93 0 93 93 0 8 0
ffsino 296 1655 0 182 114 0 114 114 0 8 0
nchpl 144 1924 0 219 64 0 64 64 0 8 0
vnodes 216 1838 0 0 103 0 103 103 0 8 0
namei 1024 5940 0 5940 1 0 1 1 0 8 1
percpumem 16 51 0 0 1 0 1 1 0 8 0
kstatmem 264 27 0 0 2 0 2 2 0 8 0
scxspl 216 6999 0 6999 4 3 1 3 1 8 1
plimitpl 152 34 0 19 1 0 1 1 0 8 0
sigapl 424 522 0 456 8 0 8 8 0 8 0
knotepl 120 69 0 0 3 0 3 3 0 8 0
kqueuepl 224 45 0 37 1 0 1 1 0 8 0
pipepl 344 135 0 108 3 0 3 3 0 8 0
fdescpl 528 486 0 462 3 0 3 3 0 8 0
filepl 160 1953 0 1769 12 0 12 12 0 8 2
lockfpl 104 36 0 35 1 0 1 1 0 8 0
lockfspl 48 17 0 16 1 0 1 1 0 8 0
sessionpl 144 27 0 19 1 0 1 1 0 8 0
pgrppl 48 35 0 19 1 0 1 1 0 8 0
ucredpl 104 155 0 141 1 0 1 1 0 8 0
zombiepl 144 463 0 456 1 0 1 1 0 8 0
processpl 1232 522 0 456 6 0 6 6 0 8 0
procpl 664 620 0 546 7 0 7 7 0 8 0
sockpl 752 222 0 208 5 0 5 5 0 8 1
mcl64k 65536 2 0 0 1 0 1 1 0 8 0
mcl16k 16384 2 0 0 1 0 1 1 0 8 0
mcl12k 12288 1 0 0 1 0 1 1 0 8 0
mcl8k 8192 2 0 0 1 0 1 1 0 8 0
mcl4k 4096 120 0 0 15 0 15 15 0 8 0
mcl2k 2048 17 0 0 3 0 3 3 0 8 0
mextrefs 64 17 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 164 0 0 11 0 11 11 0 8 0
bufpl 272 2382 0 106 152 0 152 152 0 8 0
anonpl 32 4430 0 0 36 0 36 36 0 222 0
amapchunkpl 152 9898 0 9501 23 0 23 23 0 158 3
amappl16 200 1982 0 1960 5 2 3 5 0 8 1
amappl15 192 12 0 12 2 1 1 1 0 8 1
amappl14 184 432 0 431 1 0 1 1 0 8 0
amappl13 176 126 0 123 1 0 1 1 0 8 0
amappl12 168 739 0 717 2 0 2 2 0 8 0
amappl11 160 6 0 5 2 1 1 1 0 8 0
amappl10 152 68 0 62 1 0 1 1 0 8 0
amappl9 144 276 0 276 1 1 0 1 0 8 0
amappl8 136 97 0 96 1 0 1 1 0 8 0
amappl7 128 149 0 145 1 0 1 1 0 8 0
amappl6 120 159 0 158 1 0 1 1 0 8 0
amappl5 112 98 0 94 1 0 1 1 0 8 0
amappl4 104 288 0 282 1 0 1 1 0 8 0
amappl3 96 1751 0 1659 3 0 3 3 0 8 0
amappl2 88 544 0 528 2 0 2 2 0 8 0
amappl1 80 10599 0 10411 15 0 15 15 0 8 5
amappl 88 2730 0 2599 4 0 4 4 0 92 0
uvmvnodes 80 99 0 0 3 0 3 3 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 24 486 0 462 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 486 0 462 1 0 1 1 0 8 0
vmmpekpl 168 6157 0 6121 2 0 2 2 0 8 0
vmmpepl 168 40213 0 39123 86 0 86 86 0 357 17
vmsppl 488 485 0 461 5 0 5 5 0 8 1
rwobjpl 80 15182 0 14656 24 0 24 24 0 8 2
pdppl 4096 981 0 922 97 24 73 87 0 8 14
pvpl 32 11936 0 0 97 0 97 97 0 265 0
pmappl 256 485 0 461 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 422 0 28 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff852c8ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff8545e880) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff8545e880) at __mp_lock+0x272 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
__asan_load4_noabort(ffffffff8545e880) at __asan_load4_noabort
exit1(ffff8000299127d8,0,e,1) at exit1+0xa5d sys/kern/kern_exit.c:262
sigexit(ffff8000299127d8,e) at sigexit+0x191
postsig(ffff8000299127d8,e,ffff800029957eb0) at postsig+0x847 sys/kern/kern_sig.c:1763
userret(ffff8000299127d8) at userret+0x2fd sys/kern/kern_sig.c:2207
syscall(ffff8000299580a0) at syscall+0x2e0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000299580a0) at syscall+0x2e0 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77295d1cf900, count: 1
ddb{0}> trace
x86_ipi_db(ffffffff852c8ff0) at x86_ipi_db+0x19 sys/arch/amd64/amd64/db_interface.c:412
x86_ipi_handler() at x86_ipi_handler+0x112 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
__mp_lock(ffffffff8545e880) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff8545e880) at __mp_lock+0x272 sys/kern/kern_lock.c:173
softintr_dispatch(0) at softintr_dispatch+0x215 sys/kern/kern_softintr.c:83
dosoftint(0) at dosoftint+0x7b sys/arch/amd64/amd64/intr.c:862
Xsoftclock() at Xsoftclock+0x27
__asan_load4_noabort(ffffffff8545e880) at __asan_load4_noabort
exit1(ffff8000299127d8,0,e,1) at exit1+0xa5d sys/kern/kern_exit.c:262
sigexit(ffff8000299127d8,e) at sigexit+0x191
postsig(ffff8000299127d8,e,ffff800029957eb0) at postsig+0x847 sys/kern/kern_sig.c:1763
userret(ffff8000299127d8) at userret+0x2fd sys/kern/kern_sig.c:2207
syscall(ffff8000299580a0) at syscall+0x2e0 mi_syscall_return sys/sys/syscall_mi.h:203 [inline]
syscall(ffff8000299580a0) at syscall+0x2e0 sys/arch/amd64/amd64/trap.c:804
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x77295d1cf900, count: -14
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x17: popq %rbp
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84638c51) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde sys/kern/subr_kasan.c:1099
witness_checkorder(ffff800028fe4690,9,0) at witness_checkorder+0x25a sys/kern/subr_witness.c:792
mtx_enter(ffff800028fe4680) at mtx_enter+0x105 sys/kern/kern_lock.c:406
kqueue_register(ffff800028fe4680,ffff8000297fe2a0,0,0) at kqueue_register+0x3ab sys/kern/kern_event.c:1445
knote_processfork(ffff8000298034f0,14e84) at knote_processfork+0x5b1 sys/kern/kern_event.c:2286
fork1(ffff800045fffc88,1,ffffffff8235e640,0,ffff8000297fe520,0) at fork1+0x1225 sys/kern/kern_fork.c:511
syscall(ffff8000297fe5c0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000297fe5c0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b223066c480, count: 5
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff84638c51) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
__asan_load8_noabort(ffffffff846ec918) at __asan_load8_noabort+0xde sys/kern/subr_kasan.c:1099
witness_checkorder(ffff800028fe4690,9,0) at witness_checkorder+0x25a sys/kern/subr_witness.c:792
mtx_enter(ffff800028fe4680) at mtx_enter+0x105 sys/kern/kern_lock.c:406
kqueue_register(ffff800028fe4680,ffff8000297fe2a0,0,0) at kqueue_register+0x3ab sys/kern/kern_event.c:1445
knote_processfork(ffff8000298034f0,14e84) at knote_processfork+0x5b1 sys/kern/kern_event.c:2286
fork1(ffff800045fffc88,1,ffffffff8235e640,0,ffff8000297fe520,0) at fork1+0x1225 sys/kern/kern_fork.c:511
syscall(ffff8000297fe5c0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000297fe5c0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7b223066c480, count: -10
ddb{1}>