uvm_fault(0xfffffd8008b56740, 0xcf, 0, 2) -> e
kernel: page fault trap, code=2
Stopped at refcnt_take+0x2d: lock xaddl %eax,0(%r14)
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*464392 86228 32767 0x10 0x4000000 1K syz-executor.6
463275 34931 0 0x14000 0x200 0 softnet0
refcnt_take(cf) at refcnt_take+0x2d _atomic_add_int_nv machine/atomic.h:210 [inline]
refcnt_take(cf) at refcnt_take+0x2d sys/kern/kern_synch.c:795
priterator(ffff8000ffff0018) at priterator+0x65 sys/kern/kern_proc.c:241
sysctl_file(ffff800030b10ba8,4,20000100,ffff800030b10bd8,ffff80002a262548) at sysctl_file+0x75c
kern_sysctl(ffff800030b10ba4,5,20000100,ffff800030b10bd8,0,fffffffffffffe59,35c94796f2531b81) at kern_sysctl+0x10b sys/kern/kern_sysctl.c:457
sys_sysctl(ffff80002a262548,ffff800030b10c40,ffff800030b10c90) at sys_sysctl+0x219 sys/kern/kern_sysctl.c:254
syscall(ffff800030b10d40) at syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline]
syscall(ffff800030b10d40) at syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd4d1821e070, count: 8
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: uvm_fault(0xfffffd8008b56740, 0xcf, 0, 2) -> e
ddb{1}> trace
refcnt_take(cf) at refcnt_take+0x2d _atomic_add_int_nv machine/atomic.h:210 [inline]
refcnt_take(cf) at refcnt_take+0x2d sys/kern/kern_synch.c:795
priterator(ffff8000ffff0018) at priterator+0x65 sys/kern/kern_proc.c:241
sysctl_file(ffff800030b10ba8,4,20000100,ffff800030b10bd8,ffff80002a262548) at sysctl_file+0x75c
kern_sysctl(ffff800030b10ba4,5,20000100,ffff800030b10bd8,0,fffffffffffffe59,35c94796f2531b81) at kern_sysctl+0x10b sys/kern/kern_sysctl.c:457
sys_sysctl(ffff80002a262548,ffff800030b10c40,ffff800030b10c90) at sys_sysctl+0x219 sys/kern/kern_sysctl.c:254
syscall(ffff800030b10d40) at syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline]
syscall(ffff800030b10d40) at syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd4d1821e070, count: -7
ddb{1}> show registers
rdi 0xcf
rsi 0x1
rbp 0xffff800030b108c0
rbx 0x4
rdx 0
rcx 0xffff80002a262548
rax 0x1
r8 0x7f7fffffc000
r9 0xffff8000ffff0018
r10 0xf6cde93e44c4a0c3
r11 0xafc6d7dc645897fd
r12 0xfffffd80760bc5d0
r13 0x7fbf __ALIGN_SIZE+0x6fbf
r14 0xcf
r15 0xffffffffffffffff
rip 0xffffffff81f4cf1d refcnt_take+0x2d
cs 0x8
rflags 0x10246 __ALIGN_SIZE+0xf246
rsp 0xffff800030b10880
ss 0x10
refcnt_take+0x2d: lock xaddl %eax,0(%r14)
ddb{1}> show proc
PROC (syz-executor.6) tid=464392 pid=86228 tcnt=3 stat=onproc
flags process=10<SUGID> proc=4000000<THREAD>
runpri=32, usrpri=80, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0x0
forw=0xffffffffffffffff, list=0xffff80002a262a98,0xffff80002a2622b0
process=0xffff8000ffff0908 user=0xffff800030b0b000, vmspace=0xfffffd8008b56740
estcpu=36, cpticks=1, pctcpu=0.0, user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
34085 6065 56907 32767 2 0x10 syz-executor.1
86228 330340 84339 32767 2 0x10 syz-executor.6
*86228 464392 84339 32767 7 0x4000010 syz-executor.6
86228 485665 84339 32767 3 0x4000090 fsleep syz-executor.6
79075 325812 6605 32767 2 0x10 syz-executor.4
3729 279069 85290 32767 3 0x90 nanoslp syz-executor.3
3729 27348 85290 32767 3 0x4000090 piperd syz-executor.3
3729 319116 85290 32767 3 0x4000090 piperd syz-executor.3
3729 500832 85290 32767 3 0x4000090 fsleep syz-executor.3
84339 441617 32359 32767 3 0x90 nanoslp syz-executor.6
32359 68138 93041 0 3 0x82 wait syz-executor.6
27121 36755 84018 32767 3 0x90 nanoslp syz-executor.2
84018 421918 93041 0 3 0x82 wait syz-executor.2
85290 314208 36749 32767 3 0x90 nanoslp syz-executor.3
36749 187553 93041 0 3 0x82 wait syz-executor.3
56907 223144 47590 32767 3 0x90 nanoslp syz-executor.1
47590 482907 93041 0 3 0x82 wait syz-executor.1
25860 246745 74225 32767 2 0x10 syz-executor.5
74225 39236 93041 0 3 0x82 wait syz-executor.5
40869 504370 93981 32767 3 0x90 nanoslp syz-executor.7
93981 91861 93041 0 3 0x82 wait syz-executor.7
6605 325577 78110 32767 2 0x10 syz-executor.4
78110 340818 93041 0 3 0x82 wait syz-executor.4
99408 260038 17818 32767 2 0x10 syz-executor.0
17818 32423 93041 0 3 0x82 wait syz-executor.0
43353 147436 0 0 3 0x14200 bored sosplice
93041 501535 50943 0 3 0x2000082 wait syz-fuzzer
93041 60279 50943 0 2 0x6000082 syz-fuzzer
93041 140915 50943 0 3 0x6000082 wait syz-fuzzer
93041 251680 50943 0 3 0x6000082 thrsleep syz-fuzzer
93041 255730 50943 0 3 0x6000082 wait syz-fuzzer
93041 126393 50943 0 3 0x6000082 wait syz-fuzzer
93041 157775 50943 0 3 0x6000082 thrsleep syz-fuzzer
93041 224233 50943 0 3 0x6000082 wait syz-fuzzer
93041 309889 50943 0 3 0x6000082 thrsleep syz-fuzzer
93041 37600 50943 0 3 0x6000082 kqread syz-fuzzer
93041 11442 50943 0 3 0x6000082 thrsleep syz-fuzzer
93041 299445 50943 0 3 0x6000082 thrsleep syz-fuzzer
93041 25135 50943 0 3 0x6000082 thrsleep syz-fuzzer
93041 194614 50943 0 3 0x6000082 wait syz-fuzzer
93041 233501 50943 0 3 0x6000082 wait syz-fuzzer
93041 218049 50943 0 3 0x6000082 wait syz-fuzzer
50943 154028 70194 0 3 0x10008a sigsusp ksh
70194 128850 67398 0 3 0x9a kqread sshd
21920 144726 1 0 3 0x100083 ttyin getty
67398 250625 1 0 3 0x88 kqread sshd
17492 167816 51478 73 3 0x1100090 kqread syslogd
51478 89612 1 0 3 0x100082 netio syslogd
18424 240933 1 0 3 0x100080 kqread resolvd
29720 195999 8794 77 3 0x100092 kqread dhcpleased
48519 48577 8794 77 3 0x100092 kqread dhcpleased
8794 381562 1 0 3 0x80 kqread dhcpleased
96009 369148 0 0 3 0x14200 bored smr
56590 272655 0 0 2 0x14200 zerothread
45346 177835 0 0 3 0x14200 aiodoned aiodoned
84457 434167 0 0 3 0x14200 syncer update
59266 140894 0 0 3 0x14200 cleaner cleaner
67017 93108 0 0 3 0x14200 reaper reaper
77262 299286 0 0 3 0x14200 pgdaemon pagedaemon
87269 312868 0 0 3 0x14200 bored viomb
1386 517047 0 0 3 0x40014200 acpi0 acpi0
25335 276276 0 0 3 0x40014200 idle1
72437 11812 0 0 3 0x14200 bored softnet3
93292 55746 0 0 3 0x14200 bored softnet2
35048 458052 0 0 3 0x14200 bored softnet1
34931 463275 0 0 7 0x14200 softnet0
13171 489926 0 0 3 0x14200 bored systqmp
88752 477395 0 0 3 0x14200 bored systq
19283 361687 0 0 3 0x14200 tmoslp softclockmp
76617 99874 0 0 3 0x40014200 tmoslp softclock
63830 76038 0 0 3 0x40014200 idle0
1 131670 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 86228 (syz-executor.6) thread 0xffff80002a262548 (464392)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82e71648)
#0 witness_lock+0x447
#1 __mp_acquire_count+0x48 sys/kern/kern_lock.c:227
#2 mi_switch+0x46d sys/kern/sched_bsd.c:470
#3 sleep_finish+0x19b sys/kern/kern_synch.c:414
#4 rw_enter+0x341 sys/kern/kern_rwlock.c:285
#5 fill_file+0x30a sys/kern/kern_sysctl.c:1290
#6 sysctl_file+0x62d sys/kern/kern_sysctl.c:1585
#7 kern_sysctl+0x10b sys/kern/kern_sysctl.c:457
#8 sys_sysctl+0x219 sys/kern/kern_sysctl.c:254
#9 syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline]
#9 syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591
#10 Xsyscall+0x128
exclusive rwlock sysctllk r = 0 (0xffffffff82cfc800)
#0 witness_lock+0x447
#1 rw_enter+0x3c8 sys/kern/kern_rwlock.c:309
#2 sys_sysctl+0x1c3 sys/kern/kern_sysctl.c:238
#3 syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline]
#3 syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591
#4 Xsyscall+0x128
Process 34931 (softnet0) thread 0xffff80002a10b000 (463275)
shared rwlock softnet0 r = 0 (0xffff80000002d070)
#0 witness_lock+0x447
#1 taskq_thread+0xca sys/kern/kern_task.c:446
#2 proc_trampoline+0x10
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10224 6414K 6421K 166960K 11415 0
pcb 15 24K 28K 166960K 25 0
rtable 246 7K 7K 166960K 3777 0
pf 29 8K 8K 166960K 103 0
ifaddr 44 15K 16K 166960K 198 0
ifgroup 50 2K 2K 166960K 198 0
sysctl 4 1K 5K 166960K 12 0
counters 64 36K 36K 166960K 138 0
ioctlops 0 0K 2K 166960K 533 0
iov 0 0K 44K 166960K 4848 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1279 80K 80K 166960K 7441 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 1K 9K 166960K 414 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 7444 0
dirhash 12 2K 2K 166960K 12 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 23 85K 121K 166960K 34462 0
sigio 0 0K 0K 166960K 1381 0
proc 56 78K 127K 166960K 3441 0
subproc 104 6K 6K 166960K 585 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 3724 0
in_multi 99 7K 7K 166960K 876 0
ether_multi 1 0K 0K 166960K 33 0
mrt 1 0K 0K 166960K 3 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 4451 0
tdb 3 0K 0K 166960K 3 0
pagedep 1 8K 8K 166960K 1 0
inodedep 1 32K 32K 166960K 1 0
newblk 1 0K 0K 166960K 1 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 448 90K 110K 166960K 342186 0
UVM aobj 131 4K 4K 166960K 134 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 1 0K 0K 166960K 855 0
NDP 11 0K 2K 166960K 138 0
temp 75 6713K 6840K 166960K 85690 0
kqueue 12 18K 31K 166960K 3206 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 24 0 0 1 0 1 1 0 8 0
rtpcb 120 2562 0 2559 30 29 1 5 0 8 0
rtentry 112 561 0 445 4 0 4 4 0 8 0
unpcb 144 24933 0 24916 207 201 6 11 0 8 5
syncache 312 455 0 455 60 60 0 1 0 8 0
tcpqe 32 498 0 498 55 55 0 1 0 8 0
tcpcb 808 17537 0 17503 311 306 5 21 0 8 0
arp 120 97 0 78 1 0 1 1 0 8 0
ipq 40 59 0 56 19 18 1 1 0 8 0
ipqe 40 679 0 673 19 18 1 1 0 8 0
inpcb 368 37695 0 37656 412 402 10 21 0 8 3
nd6 136 173 0 144 5 3 2 2 0 8 0
kcovpl 48 45 0 37 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 2196 0 1724 36 6 30 30 0 8 0
art_table 32 2197 0 1724 4 0 4 4 0 8 0
art_node 16 560 0 454 1 0 1 1 0 8 0
semupl 112 5 0 5 2 2 0 1 0 8 0
semapl 112 7442 0 7432 1 0 1 1 0 8 0
shmpl 112 131 0 3 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 46082 0 44585 94 0 94 94 0 8 0
ffsino 272 46082 0 44585 100 0 100 100 0 8 0
nchpl 144 91687 0 90041 63 0 63 63 0 8 0
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 290324 0 290324 9 8 1 2 0 8 1
percpumem 16 83 0 37 1 0 1 1 0 8 0
kstatmem 264 96 0 74 2 0 2 2 0 8 0
scxspl 216 291115 0 291115 127 124 3 8 1 8 3
plimitpl 152 4596 0 4573 47 46 1 2 0 8 0
sigapl 424 34679 0 34625 7 0 7 7 0 8 0
futexpl 64 285556 0 285554 9 8 1 1 0 8 0
knotepl 120 1135 0 0 8 0 8 8 0 8 0
kqueuepl 216 7797 0 7789 127 126 1 7 0 8 0
pipepl 320 7299 0 7270 163 154 9 14 0 8 6
fdescpl 496 34660 0 34626 6 1 5 6 0 8 0
filepl 152 214692 0 214445 321 305 16 24 0 8 4
lockfpl 104 5364 0 5362 3 2 1 2 0 8 0
lockfspl 48 1437 0 1435 1 0 1 1 0 8 0
sessionpl 144 60 0 44 1 0 1 1 0 8 0
pgrppl 48 886 0 870 1 0 1 1 0 8 0
ucredpl 104 34740 0 34722 1 0 1 1 0 8 0
zombiepl 144 34627 0 34625 1 0 1 1 0 8 0
processpl 1144 34679 0 34625 5 0 5 5 0 8 0
procpl 680 97219 0 97145 15 7 8 9 0 8 0
sosppl 168 696 0 694 31 30 1 1 0 8 0
sockpl 488 68519 0 68461 948 924 24 40 0 8 15
mcl64k 65536 49 0 0 4 1 3 3 0 8 0
mcl16k 16384 33 0 0 3 0 3 3 0 8 0
mcl12k 12288 46 0 0 2 0 2 2 0 8 0
mcl9k 9216 28 0 0 2 1 1 2 0 8 0
mcl8k 8192 61 0 0 5 3 2 3 0 8 0
mcl4k 4096 105 0 0 4 1 3 4 0 8 0
mcl2k2 2112 22 0 0 2 0 2 2 0 8 0
mcl2k 2048 627 0 0 38 19 19 31 0 8 0
mtagpl 96 10 0 0 1 0 1 1 0 8 0
mbufpl 256 4677 0 0 219 0 219 219 0 8 0
bufpl 288 72822 0 66506 452 0 452 452 0 8 0
anonpl 24 3548037 0 3535303 266 160 106 117 0 186 0
amapchunkpl 152 1118858 0 1117961 245 203 42 55 0 158 0
amappl16 200 83169 0 82849 361 338 23 37 0 8 1
amappl15 192 49 0 48 6 5 1 1 0 8 0
amappl14 184 280 0 267 2 1 1 2 0 8 0
amappl13 176 15 0 15 6 6 0 1 0 8 0
amappl12 168 35917 0 35869 4 1 3 3 0 8 0
amappl11 160 49 0 39 1 0 1 1 0 8 0
amappl10 152 74 0 61 1 0 1 1 0 8 0
amappl9 144 481 0 481 62 61 1 1 0 8 1
amappl8 136 1644 0 1420 8 0 8 8 0 8 0
amappl7 128 412 0 385 2 0 2 2 0 8 0
amappl6 120 1149 0 1126 1 0 1 1 0 8 0
amappl5 112 871 0 862 1 0 1 1 0 8 0
amappl4 104 1470 0 1427 3 1 2 2 0 8 0
amappl3 96 211136 0 211041 27 23 4 4 0 8 0
amappl2 88 37310 0 37213 5 2 3 3 0 8 0
amappl1 80 130419 0 129901 22 10 12 22 0 8 0
amappl 88 339792 0 339530 8 0 8 8 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 72 133 0 3 3 0 3 3 0 8 0
uaddrrnd 24 34660 0 34626 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 34660 0 34626 1 0 1 1 0 8 0
vmmpekpl 168 264754 0 264690 4 0 4 4 0 8 0
vmmpepl 168 2016481 0 2013922 547 415 132 150 0 357 0
vmsppl 464 34659 0 34626 6 1 5 6 0 8 0
rwobjpl 56 503285 0 495685 117 5 112 112 0 8 0
pdppl 4096 69327 0 69252 901 820 81 93 0 8 6
pvpl 32 44111 0 0 356 0 356 356 0 265 0
pmappl 248 34659 0 34626 3 0 3 3 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 2670 0 1635 31 0 31 31 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1e: addq $0x8,%rsp
x86_ipi_db(ffffffff82cc7ff0) 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(ffffffff82e71440) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82e71440) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x27
__mp_lock(ffffffff82e71440) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82e71440) at __mp_lock+0x129 sys/kern/kern_lock.c:147
if_qstart_compat(ffff8000001a1550) at if_qstart_compat+0x1e sys/net/if.c:716
ifq_serialize(ffff8000001a1550,ffff8000001a1678) at ifq_serialize+0x16e sys/net/ifq.c:113
taskq_thread(ffff80000002d000) at taskq_thread+0xe5 sys/kern/kern_task.c:450
end trace frame: 0x0, count: 5
ddb{0}> trace
x86_ipi_db(ffffffff82cc7ff0) 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(ffffffff82e71440) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82e71440) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x52 sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x27
__mp_lock(ffffffff82e71440) at __mp_lock+0x129 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82e71440) at __mp_lock+0x129 sys/kern/kern_lock.c:147
if_qstart_compat(ffff8000001a1550) at if_qstart_compat+0x1e sys/net/if.c:716
ifq_serialize(ffff8000001a1550,ffff8000001a1678) at ifq_serialize+0x16e sys/net/ifq.c:113
taskq_thread(ffff80000002d000) at taskq_thread+0xe5 sys/kern/kern_task.c:450
end trace frame: 0x0, count: -10
ddb{0}> machine ddbcpu 1
Stopped at refcnt_take+0x2d: lock xaddl %eax,0(%r14)
refcnt_take(cf) at refcnt_take+0x2d _atomic_add_int_nv machine/atomic.h:210 [inline]
refcnt_take(cf) at refcnt_take+0x2d sys/kern/kern_synch.c:795
priterator(ffff8000ffff0018) at priterator+0x65 sys/kern/kern_proc.c:241
sysctl_file(ffff800030b10ba8,4,20000100,ffff800030b10bd8,ffff80002a262548) at sysctl_file+0x75c
kern_sysctl(ffff800030b10ba4,5,20000100,ffff800030b10bd8,0,fffffffffffffe59,35c94796f2531b81) at kern_sysctl+0x10b sys/kern/kern_sysctl.c:457
sys_sysctl(ffff80002a262548,ffff800030b10c40,ffff800030b10c90) at sys_sysctl+0x219 sys/kern/kern_sysctl.c:254
syscall(ffff800030b10d40) at syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline]
syscall(ffff800030b10d40) at syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd4d1821e070, count: 8
ddb{1}> trace
refcnt_take(cf) at refcnt_take+0x2d _atomic_add_int_nv machine/atomic.h:210 [inline]
refcnt_take(cf) at refcnt_take+0x2d sys/kern/kern_synch.c:795
priterator(ffff8000ffff0018) at priterator+0x65 sys/kern/kern_proc.c:241
sysctl_file(ffff800030b10ba8,4,20000100,ffff800030b10bd8,ffff80002a262548) at sysctl_file+0x75c
kern_sysctl(ffff800030b10ba4,5,20000100,ffff800030b10bd8,0,fffffffffffffe59,35c94796f2531b81) at kern_sysctl+0x10b sys/kern/kern_sysctl.c:457
sys_sysctl(ffff80002a262548,ffff800030b10c40,ffff800030b10c90) at sys_sysctl+0x219 sys/kern/kern_sysctl.c:254
syscall(ffff800030b10d40) at syscall+0x5f0 mi_syscall sys/sys/syscall_mi.h:182 [inline]
syscall(ffff800030b10d40) at syscall+0x5f0 sys/arch/amd64/amd64/trap.c:591
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd4d1821e070, count: -7