panic: Caught invalid memory access at ffff800001b59652 size 2 op 0
Stopped at db_enter+0x17: popq %rbp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*312607 52940 0 0 0x4000000 1K syz-executor
24112 72704 0 0 0 0 syz-executor
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846414f3) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001b59652) at __asan_load2_noabort+0x107
knote_processfork(ffffffff85423320,5eca) at knote_processfork+0x603 sys/kern/kern_event.c:2289
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff800036af8720) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff800036af8af0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800036af8af0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x88d2c7e4090, count: 6
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 ffff800001b59652 size 2 op 0
ddb{1}> show kasan
KASAN: invalid read of 2 bytes at 0xffff800001b59652 from pc 0xffffffff82996e13
KASAN: first bad byte at 0xffff800001b59652 (+0); shadow 0xfd: pool use-after-free (or unallocated item)
KASAN: 0xffff800001b59652 is 50 bytes inside the 120-byte item [0xffff800001b59620..0xffff800001b59698) in pool 'knotepl'
KASAN: allocated at:
#0 pool_get+0x770 sys/kern/subr_pool.c:834
#1 kqueue_register+0x2f2 sys/kern/kern_event.c:1431
#2 sys_kevent+0x409 sys/kern/kern_event.c:1301
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#4 Xsyscall+0x128
KASAN: freed at:
#0 pool_put+0x79 sys/kern/subr_pool.c:1019
#1 kqueue_scan+0x1191 sys/kern/kern_event.c:1797
#2 sys_kevent+0x997 sys/kern/kern_event.c:1336
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#4 Xsyscall+0x128
KASAN: pc: knote_processfork+0x603
KASAN: call trace:
#0 __asan_load2_noabort+0xe6 kasan_shadow_check sys/kern/subr_kasan.c:-1 [inline]
#0 __asan_load2_noabort+0xe6 sys/kern/subr_kasan.c:1097
#1 knote_processfork+0x603 sys/kern/kern_event.c:2289
#2 fork1+0x1225 sys/kern/kern_fork.c:511
#3 kthread_create+0xa8 sys/kern/kern_kthread.c:61
#4 sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
#4 sys_acct+0x35e sys/kern/kern_acct.c:151
#5 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#6 Xsyscall+0x128
KASAN: shadow of 0xffff800001b59500..0xffff800001b59780 (1 cell = 8 bytes):
0xffff800001b59500: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
0xffff800001b59580: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
>0xffff800001b59600: 08 08 08 08 fd fd fd fd fd fd[fd]fd fd fd fd fd
0xffff800001b59680: fd fd fd 08 08 08 08 08 08 08 08 08 08 08 08 08
0xffff800001b59700: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
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(ffffffff846414f3) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001b59652) at __asan_load2_noabort+0x107
knote_processfork(ffffffff85423320,5eca) at knote_processfork+0x603 sys/kern/kern_event.c:2289
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff800036af8720) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff800036af8af0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800036af8af0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x88d2c7e4090, count: -9
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800036af82d0
rbx 0xffff800036af8340
rdx 0
rcx 0xffff800028fe3ff0
rax 0xffff800000170100
r8 0x101010101010101
r9 0x8080808080808080
r10 0xffff800036af80b8
r11 0xffffffff81fc8940 x86_bus_space_io_read_1
r12 0xffffffff846414f3 .str.219+0x9bc53
r13 0xffff800028fe4c08
r14 0xffff800028fe4e07
r15 0x1
rip 0xffffffff83ac6a17 db_enter+0x17
cs 0x8
rflags 0x246
rsp 0xffff800036af82d0
ss 0x10
db_enter+0x17: popq %rbp
ddb{1}> show proc
PROC (syz-executor) tid=312607 pid=52940 tcnt=3 stat=onproc
flags process=0 proc=4000000<THREAD>
runpri=32, usrpri=74, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff800037b0b4e8,0xffff800037b0a800
process=0xffff800045ffb038 user=0xffff800036aed000, vmspace=0xffff800001c503e8
estcpu=24, cpticks=25, pctcpu=0.3, user=0, sys=25, intr=0
ddb{1}> ps
PID TID PPID UID S PRLAGS PFLAGS WAIT COMMAND
24266 518676 0 0 2 0x14000 0x200 swapper
3507 85361 76976 0 2 0 0 syz-executor
3507 15847 76976 0 3 0 0x4000080 fsleep syz-executor
92941 417040 92625 0 2 0x1000 0x80000 syz-executor
92941 136697 92625 0 3 0x1000 0x4002000 suspend syz-executor
67335 427700 58046 0 2 0 0 syz-executor
67335 470748 58046 0 3 0 0x4000080 fsleep syz-executor
67335 58111 58046 0 3 0 0x4000080 fsleep syz-executor
67335 511080 58046 0 2 0 0x4000000 syz-executor
55907 263144 29959 0 2 0 0 syz-executor
55907 133089 29959 0 3 0 0x4000080 kqread syz-executor
55907 251696 29959 0 3 0 0x4000080 fsleep syz-executor
52940 112046 50056 0 2 0 0 syz-executor
52940 211639 50056 0 3 0 0x4000080 kqread syz-executor
*52940 312607 50056 0 7 0 0x4000000 syz-executor
72704 24112 95468 0 7 0 0 syz-executor
72704 463004 95468 0 3 0 0x4000080 kqread syz-executor
72704 256958 95468 0 3 0 0x4000080 fsleep syz-executor
76976 6346 61916 0 3 0x2 0x80 nanoslp syz-executor
58046 235216 61916 0 3 0x2 0x80 nanoslp syz-executor
37955 518846 61916 0 3 0x10000002 0x80 nanoslp syz-executor
50056 374594 61916 0 3 0x2 0x80 nanoslp syz-executor
95468 457033 61916 0 3 0x2 0x80 nanoslp syz-executor
584 315026 61916 0 3 0x2 0x80 nanoslp syz-executor
29959 366554 61916 0 3 0x2 0x80 nanoslp syz-executor
92625 276284 61916 0 3 0x2 0x80 nanoslp syz-executor
61916 207672 44665 0 3 0x2 0x80 kqread syz-executor
44665 368168 76309 0 3 0x100002 0x88 sigsusp ksh
76309 52314 31843 0 3 0x10 0x88 kqread sshd-session
31843 251869 77931 0 3 0x12 0x80 kqread sshd-session
12156 67748 1 0 3 0x100003 0x80 ttyin getty
77931 323278 1 0 3 0 0x88 kqread sshd
21316 491250 41389 74 3 0x1100012 0x80 bpf pflogd
41389 326940 1 0 3 0 0x80 sbwait pflogd
7819 156510 65232 73 3 0x1100010 0x80 kqread syslogd
65232 232378 1 0 3 0x100002 0x80 sbwait syslogd
95096 313603 1 0 3 0x100000 0x80 kqread resolvd
52402 313058 25953 77 3 0x100012 0x80 kqread dhcpleased
64621 193008 25953 77 3 0x100012 0x80 kqread dhcpleased
25953 462614 1 0 3 0 0x80 kqread dhcpleased
11307 486772 0 0 3 0x14000 0x200 bored smr
3240 324798 0 0 2 0x14000 0x200 zerothread
33501 388890 0 0 3 0x14000 0x200 aiodoned aiodoned
67712 254057 0 0 3 0x14000 0x200 syncer update
59053 495542 0 0 3 0x14000 0x200 cleaner cleaner
35793 292096 0 0 3 0x14000 0x200 reaper reaper
41084 147552 0 0 3 0x14000 0x200 pgdaemon pagedaemon
92695 464529 0 0 3 0x14000 0x200 bored viomb
436 105585 0 0 3 0x14000 0x40000200 acpi0 acpi0
35421 180931 0 0 3 0x14000 0x40000200 idle1
89392 186780 0 0 3 0x14000 0x200 bored softnet1
58200 206325 0 0 3 0x14000 0x200 bored softnet0
78751 170519 0 0 3 0x14000 0x200 bored systqmp
5092 161070 0 0 3 0x14000 0x200 bored systq
79914 105436 0 0 3 0x14000 0x200 tmoslp softclockmp
18490 117108 0 0 3 0x14000 0x40000200 tmoslp softclock
92942 73226 0 0 3 0x14000 0x40000200 idle0
1 143660 0 0 3 0x2 0x80 wait init
0 0 -1 0 3 0x10000 0x200 scheduler swapper
ddb{1}> show all locks
Process 52940 (syz-executor) thread 0xffff800037b0aa88 (312607)
exclusive rwlock acctlk r = 0 (0xffffffff8518f338)
#0 witness_lock+0x632 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x632 sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x53e sys/kern/kern_rwlock.c:320
#2 sys_acct+0x1be sys/kern/kern_acct.c:137
#3 syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#3 syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
#4 Xsyscall+0x128
exclusive kernel_lock &kernel_lock r = 1 (0xffffffff85439c00)
#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 11058 12244K 12533K 166960K 12194 0
pcb 17 24K 24K 166960K 19 0
rtable 240 13K 13K 166960K 354 0
pf 35 22K 22K 166960K 46 0
ifaddr 43 12K 12K 166960K 45 0
ifgroup 55 2K 2K 166960K 55 0
sysctl 1 1K 13K 166960K 5 0
counters 70 42K 42K 166960K 70 0
ioctlops 0 0K 4K 166960K 1484 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1295 83K 83K 166960K 1379 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 2 0K 0K 166960K 2 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1734 201K 292K 166960K 11964 0
file desc 17 61K 93K 166960K 154 0
proc 70 128K 177K 166960K 552 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 2 0
ISOFS mount 1 36K 36K 166960K 1 0
MSDOSFS mount 1 20K 20K 166960K 1 0
ttys 61 425K 425K 166960K 61 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 236 244K 264K 166960K 3273 0
UVM aobj 4 4K 4K 166960K 4 0
pinsyscall 1066 1722K 1727K 166960K 1313 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 2 0
NDP 18 0K 1K 166960K 28 0
temp 34 9166K 9176K 166960K 3904 0
kqueue 18 48K 48K 166960K 32 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 33 0 30 1 0 1 1 0 8 0
rtentry 176 111 0 1 5 0 5 5 0 8 0
unpcb 144 46 0 29 1 0 1 1 0 8 0
syncache 336 4 0 4 1 0 1 1 0 8 1
tcpcb 736 8 0 4 1 0 1 1 0 8 0
arp 136 18 0 0 1 0 1 1 0 8 0
inpcb 328 72 0 65 1 0 1 1 0 8 0
nd6 152 24 0 0 1 0 1 1 0 8 0
kcovpl 48 8 0 0 1 0 1 1 0 8 0
pffrag 232 2 0 1 1 0 1 1 0 482 0
pffrnode 88 2 0 1 1 0 1 1 0 8 0
pffrent 40 3 0 2 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 1 0 0 1 0 1 1 0 8 0
pfstitem 24 21 0 0 1 0 1 1 0 8 0
pfstkey 128 21 0 0 1 0 1 1 0 8 0
pfstate 448 21 0 0 3 0 3 3 0 8 0
pfrule 1360 22 0 16 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 452 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
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 1591 0 121 92 0 92 92 0 8 0
ffsino 296 1591 0 121 114 0 114 114 0 8 0
nchpl 144 1809 0 105 64 0 64 64 0 8 0
vnodes 216 1691 0 0 94 0 94 94 0 8 0
namei 1024 5539 0 5539 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 6676 0 6676 4 3 1 3 1 8 1
plimitpl 152 30 0 12 1 0 1 1 0 8 0
sigapl 424 473 0 424 7 0 7 7 0 8 0
knotepl 120 57 0 0 2 0 2 2 0 8 0
kqueuepl 224 32 0 18 1 0 1 1 0 8 0
pipepl 344 126 0 99 3 0 3 3 0 8 0
fdescpl 528 456 0 425 3 0 3 3 0 8 0
filepl 160 1643 0 1416 10 0 10 10 0 8 0
lockfpl 104 12 0 10 1 0 1 1 0 8 0
lockfspl 48 7 0 5 1 0 1 1 0 8 0
sessionpl 144 25 0 15 1 0 1 1 0 8 0
pgrppl 48 33 0 15 1 0 1 1 0 8 0
ucredpl 104 114 0 101 1 0 1 1 0 8 0
zombiepl 144 427 0 424 1 0 1 1 0 8 0
processpl 1232 473 0 424 5 0 5 5 0 8 1
procpl 664 508 0 448 6 0 6 6 0 8 0
sockpl 752 151 0 124 4 0 4 4 0 8 1
mcl64k 65536 4 0 0 1 0 1 1 0 8 0
mcl16k 16384 3 0 0 1 0 1 1 0 8 0
mcl12k 12288 2 0 0 1 0 1 1 0 8 0
mcl9k128 9344 2 0 0 1 0 1 1 0 8 0
mcl8k 8192 3 0 0 1 0 1 1 0 8 0
mcl4k 4096 117 0 0 15 0 15 15 0 8 0
mcl2k 2048 12 0 0 2 0 2 2 0 8 0
mextrefs 64 12 0 0 1 0 1 1 0 8 0
mtagpl 96 3 0 0 1 0 1 1 0 8 0
mbufpl 256 137 0 0 9 0 9 9 0 8 0
bufpl 272 2347 0 106 150 0 150 150 0 8 0
anonpl 32 3811 0 0 31 0 31 31 0 222 0
amapchunkpl 152 8971 0 8472 21 0 21 21 0 158 0
amappl16 200 1857 0 1829 5 2 3 5 0 8 0
amappl15 192 1 0 1 1 1 0 1 0 8 0
amappl14 184 441 0 440 1 0 1 1 0 8 0
amappl13 176 125 0 113 1 0 1 1 0 8 0
amappl12 168 710 0 678 2 0 2 2 0 8 0
amappl11 160 6 0 6 2 2 0 1 0 8 0
amappl10 152 79 0 65 1 0 1 1 0 8 0
amappl9 144 277 0 277 1 1 0 1 0 8 0
amappl8 136 105 0 103 1 0 1 1 0 8 0
amappl7 128 151 0 137 1 0 1 1 0 8 0
amappl6 120 158 0 157 1 0 1 1 0 8 0
amappl5 112 100 0 90 1 0 1 1 0 8 0
amappl4 104 309 0 289 1 0 1 1 0 8 0
amappl3 96 1527 0 1428 3 0 3 3 0 8 0
amappl2 88 580 0 500 2 0 2 2 0 8 0
amappl1 80 10534 0 9933 15 0 15 15 0 8 0
amappl 88 2549 0 2384 4 0 4 4 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 24 456 0 425 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 456 0 425 1 0 1 1 0 8 0
vmmpekpl 168 5788 0 5755 2 0 2 2 0 8 0
vmmpepl 168 38692 0 36777 87 0 87 87 0 357 0
vmsppl 488 455 0 425 5 0 5 5 0 8 1
rwobjpl 80 14792 0 13761 24 0 24 24 0 8 2
pdppl 4096 921 0 850 103 18 85 87 0 8 14
pvpl 32 13760 0 0 111 0 111 111 0 265 0
pmappl 256 455 0 425 3 0 3 3 0 8 0
extentpl 40 47 0 29 1 0 1 1 0 8 0
phpool 120 421 0 21 13 0 13 13 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x19: leave
x86_ipi_db(ffffffff850daff0) 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(ffffffff85439400) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85439400) 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
end of kernel
end trace frame: 0x7c8220e0bd40, count: 8
ddb{0}> trace
x86_ipi_db(ffffffff850daff0) 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(ffffffff85439400) at __mp_lock+0x272 __mp_lock_spin sys/kern/kern_lock.c:142 [inline]
__mp_lock(ffffffff85439400) 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
end of kernel
end trace frame: 0x7c8220e0bd40, count: -7
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(ffffffff846414f3) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001b59652) at __asan_load2_noabort+0x107
knote_processfork(ffffffff85423320,5eca) at knote_processfork+0x603 sys/kern/kern_event.c:2289
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff800036af8720) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff800036af8af0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800036af8af0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x88d2c7e4090, count: 6
ddb{1}> trace
db_enter() at db_enter+0x17 sys/arch/amd64/amd64/db_interface.c:457
panic(ffffffff846414f3) at panic+0x270 sys/kern/subr_prf.c:198
__asan_load2_noabort(ffff800001b59652) at __asan_load2_noabort+0x107
knote_processfork(ffffffff85423320,5eca) at knote_processfork+0x603 sys/kern/kern_event.c:2289
fork1(ffffffff85422fc0,f0,ffffffff82b481d0,0,0,ffff800036af8720) at fork1+0x1225 sys/kern/kern_fork.c:511
kthread_create(ffffffff82b481d0,0,ffffffff85d6daa0,ffffffff84b32660) at kthread_create+0xa8 sys/kern/kern_kthread.c:61
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e acct_start sys/kern/kern_acct.c:300 [inline]
sys_acct(ffff800037b0aa88,ffff800036af8af0,ffff800036af8a60) at sys_acct+0x35e sys/kern/kern_acct.c:151
syscall(ffff800036af8af0) at syscall+0x1089 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff800036af8af0) at syscall+0x1089 sys/arch/amd64/amd64/trap.c:783
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x88d2c7e4090, count: -9