panic: vclean: deadlock
Stopped at db_enter+0x25: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
421884 39671 73 0x19100010 0 1 syslogd
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff830e3e0b) at panic+0x1e5 sys/kern/subr_prf.c:198
vclean(fffffd80677d0a38,8,ffff80002f7742d0) at vclean+0x482 sys/kern/vfs_subr.c:1065
vgonel(fffffd80677d0a38,ffff80002f7742d0) at vgonel+0xec sys/kern/vfs_subr.c:1197
vcount(fffffd807525ee68) at vcount+0x179 sys/kern/vfs_subr.c:1298
spec_close(ffff80003719a0e0) at spec_close+0x219 sys/kern/spec_vnops.c:524
VOP_CLOSE(fffffd807525ee68,1,fffffd807f7d38f0,ffff80002f7742d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd8071b96390,ffff80002f7742d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd8071b96390,ffff80002f7742d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:609
fdrop(fffffd8071b96390,ffff80002f7742d0) at fdrop+0x126 sys/kern/kern_descrip.c:1274
closef(fffffd8071b96390,ffff80002f7742d0) at closef+0x192 sys/kern/kern_descrip.c:1258
fdfree(ffff80002f7742d0) at fdfree+0x116 sys/kern/kern_descrip.c:1190
exit1(ffff80002f7742d0,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:221
sys_exit(ffff80002f7742d0,ffff80003719a460,ffff80003719a3b0) at sys_exit+0x1a
syscall(ffff80003719a460) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80003719a460) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
end trace frame: 0xffff80003719a4e0, count: 0
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{0}>
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
*cpu0: vclean: deadlock
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff830e3e0b) at panic+0x1e5 sys/kern/subr_prf.c:198
vclean(fffffd80677d0a38,8,ffff80002f7742d0) at vclean+0x482 sys/kern/vfs_subr.c:1065
vgonel(fffffd80677d0a38,ffff80002f7742d0) at vgonel+0xec sys/kern/vfs_subr.c:1197
vcount(fffffd807525ee68) at vcount+0x179 sys/kern/vfs_subr.c:1298
spec_close(ffff80003719a0e0) at spec_close+0x219 sys/kern/spec_vnops.c:524
VOP_CLOSE(fffffd807525ee68,1,fffffd807f7d38f0,ffff80002f7742d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd8071b96390,ffff80002f7742d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd8071b96390,ffff80002f7742d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:609
fdrop(fffffd8071b96390,ffff80002f7742d0) at fdrop+0x126 sys/kern/kern_descrip.c:1274
closef(fffffd8071b96390,ffff80002f7742d0) at closef+0x192 sys/kern/kern_descrip.c:1258
fdfree(ffff80002f7742d0) at fdfree+0x116 sys/kern/kern_descrip.c:1190
exit1(ffff80002f7742d0,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:221
sys_exit(ffff80002f7742d0,ffff80003719a460,ffff80003719a3b0) at sys_exit+0x1a
syscall(ffff80003719a460) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80003719a460) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7c167c25a600, count: -15
ddb{0}> show registers
rdi 0
rsi 0x1
rbp 0xffff800037199e90
rbx 0xffffffff834a3d87 cpu_info_full_primary+0x2d87
rdx 0
rcx 0xffff80002f7742d0
rax 0xffffffff834a2ff0 cpu_info_full_primary+0x1ff0
r8 0x101010101010101
r9 0x8080808080808080
r10 0x62d415cfc5eae81c
r11 0xc2c190b13d5d6df0
r12 0xffffffff834a3b88 cpu_info_full_primary+0x2b88
r13 0
r14 0
r15 0x1
rip 0xffffffff813bf665 db_enter+0x25
cs 0x8
rflags 0x246
rsp 0xffff800037199e80
ss 0
db_enter+0x25: addq $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=416320 pid=50838 tcnt=0 stat=onproc
flags process=8001008<EXITING,SINGLEEXIT> proc=2000<WEXIT>
runpri=32, usrpri=86, slppri=32, nice=20
wchan=0x0, wmesg=, ps_single=0xffff80002f7742d0 scnt=-1 ecnt=1
forw=0xffffffffffffffff, list=0xffff80002f775488,0xffff80002f7759a8
process=0xffff80002f771fb0 user=0xffff800037195000, vmspace=0xfffffd8058adda60
estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
47795 64206 35776 0 2 0x8000000 syz-executor
47795 134272 35776 0 3 0xc000080 fsleep syz-executor
56951 88094 28955 0 2 0x8000000 syz-executor
56951 169733 28955 0 3 0xc000080 fsleep syz-executor
66702 69213 36527 0 2 0x8000000 syz-executor
66702 100586 36527 0 3 0xc000080 fsleep syz-executor
14152 150150 98402 0 2 0x8000000 syz-executor
14152 273766 98402 0 3 0xc000080 ttyretype syz-executor
10410 93186 80190 0 2 0x8000000 syz-executor
10410 345777 80190 0 3 0xc000080 fsleep syz-executor
44163 428424 25628 0 3 0x8000002 getblk syz-executor
35909 43454 25628 0 3 0x8000002 biowait syz-executor
36527 167983 25628 0 3 0x8000082 nanoslp syz-executor
28955 195010 25628 0 3 0x8000082 nanoslp syz-executor
729 14372 25628 0 3 0x8000082 nanoslp syz-executor
98402 234608 25628 0 3 0x8000082 nanoslp syz-executor
80190 289814 25628 0 3 0x8000082 nanoslp syz-executor
35776 480381 25628 0 3 0x8000082 nanoslp syz-executor
71979 215337 0 0 3 0x14200 acct acct
8565 121011 1 0 3 0x18100083 ttyin getty
66537 463489 0 0 3 0x14280 nfsidl nfsio
19010 426069 0 0 3 0x14280 nfsidl nfsio
18845 287090 0 0 3 0x14280 nfsidl nfsio
46427 493021 0 0 3 0x14280 nfsidl nfsio
27826 464451 0 0 3 0x14280 nfsidl nfsio
77065 90867 0 0 3 0x14280 nfsidl nfsio
79450 118608 0 0 3 0x14280 nfsidl nfsio
84481 398895 0 0 3 0x14280 nfsidl nfsio
43971 276394 0 0 3 0x14280 nfsidl nfsio
46210 81878 0 0 3 0x14280 nfsidl nfsio
20877 120463 0 0 3 0x14280 nfsidl nfsio
80272 112605 0 0 3 0x14280 nfsidl nfsio
94819 26965 0 0 3 0x14280 nfsidl nfsio
77409 220257 0 0 3 0x14280 nfsidl nfsio
47068 41058 0 0 3 0x14280 nfsidl nfsio
78715 137920 0 0 3 0x14280 nfsidl nfsio
46521 215647 0 0 3 0x14280 nfsidl nfsio
58533 85471 0 0 3 0x14280 nfsidl nfsio
38525 317743 0 0 3 0x14280 nfsidl nfsio
25022 167069 0 0 3 0x14280 nfsidl nfsio
66579 469971 0 0 3 0x14200 bored sosplice
25628 176055 17959 0 3 0x8000082 kqread syz-executor
17959 319505 88621 0 3 0x810008a sigsusp ksh
88621 187909 48214 0 3 0x18000098 kqread sshd-session
48214 318311 49469 0 3 0x18000092 kqread sshd-session
49469 4228 1 0 3 0x18000088 kqread sshd
16597 38400 8150 74 3 0x19100092 bpf pflogd
8150 91422 1 0 3 0x18000080 sbwait pflogd
39671 421884 77982 73 7 0x19100010 syslogd
77982 76901 1 0 3 0x18100082 sbwait syslogd
16936 462021 1 0 3 0x18100080 kqread resolvd
95024 148215 93169 77 3 0x18100092 kqread dhcpleased
9641 283780 93169 77 3 0x18100092 kqread dhcpleased
93169 388505 1 0 3 0x18000080 kqread dhcpleased
85966 243644 0 0 3 0x14200 bored smr
65778 145244 0 0 2 0x14200 zerothread
55870 250698 0 0 3 0x14200 aiodoned aiodoned
67772 46281 0 0 3 0x14200 syncer update
67957 130835 0 0 3 0x14200 cleaner cleaner
25076 43580 0 0 3 0x14200 reaper reaper
41187 107492 0 0 3 0x14200 pgdaemon pagedaemon
93595 117170 0 0 3 0x14200 bored viomb
30758 72920 0 0 3 0x40014200 acpi0 acpi0
43953 175728 0 0 3 0x40014200 idle1
72630 184864 0 0 3 0x14200 bored softnet3
72711 288779 0 0 3 0x14200 bored softnet2
85227 257902 0 0 3 0x14200 bored softnet1
61239 59486 0 0 3 0x14200 bored softnet0
30205 393258 0 0 3 0x14200 bored systqmp
46068 410661 0 0 3 0x14200 bored systq
16747 199547 0 0 3 0x14200 tmoslp softclockmp
5961 517596 0 0 3 0x40014200 tmoslp softclock
32169 8947 0 0 3 0x40014200 idle0
1 26091 0 0 3 0x8000082 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex /syzkaller/managers/multicore/kernel/sys/kern/vfs_subr.c:119 r = 0 (0xffffffff834e2e38)
#0 witness_lock+0x5b8 stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5b8 sys/kern/subr_witness.c:1151
#1 mtx_enter_try+0x178
#2 mtx_enter+0x60 sys/kern/kern_lock.c:239
#3 vclean+0x87 sys/kern/vfs_subr.c:1051
#4 vgonel+0xec sys/kern/vfs_subr.c:1197
#5 vcount+0x179 sys/kern/vfs_subr.c:1298
#6 spec_close+0x219 sys/kern/spec_vnops.c:524
#7 VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
#8 vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
#8 vn_closefile+0x12b sys/kern/vfs_vnops.c:609
#9 fdrop+0x126 sys/kern/kern_descrip.c:1274
#10 closef+0x192 sys/kern/kern_descrip.c:1258
#11 fdfree+0x116 sys/kern/kern_descrip.c:1190
#12 exit1+0x71b sys/kern/kern_exit.c:221
#13 sys_exit+0x1a
#14 syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
#14 syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
#15 Xsyscall+0x128
Process 44163 (syz-executor) thread 0xffff8000ffff6a40 (428424)
Process 35909 (syz-executor) thread 0xffff8000327851e8 (43454)
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10246 10310K 10757K 166960K 13980 0
pcb 17 18K 20K 166960K 388 0
rtable 225 8K 9K 166960K 2471 0
pf 40 10K 12K 166960K 226 0
ifaddr 49 16K 16K 166960K 335 0
ifgroup 68 2K 3K 166960K 375 0
sysctl 4 1K 1K 166960K 6 0
counters 70 37K 37K 166960K 232 0
ioctlops 0 0K 4K 166960K 1770 0
iov 0 0K 18K 166960K 105 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1524 96K 96K 166960K 3738 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 10K 18K 166960K 41 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 196 0
dirhash 15 2K 2K 166960K 69 0
ACPI 1697 195K 286K 166960K 12548 0
file desc 16 57K 93K 166960K 2495 0
sigio 0 0K 0K 166960K 47 0
proc 74 115K 140K 166960K 2428 0
subproc 104 6K 6K 166960K 924 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 433 0
in_multi 99 7K 7K 166960K 835 0
ether_multi 1 0K 0K 166960K 7 0
mrt 1 0K 0K 166960K 6 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 1439 0
pfkey data 0 0K 1K 166960K 5 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 225 76K 97K 166960K 21621 0
UVM aobj 67 5K 6K 166960K 69 0
pinsyscall 41 82K 104K 166960K 5216 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 126 0
NDP 18 0K 2K 166960K 238 0
temp 74 6815K 14752K 166960K 90433 0
kqueue 14 22K 33K 166960K 290 0
SYN cache 2 16K 16K 166960K 2 0
ddb{0}> 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 120 467 0 463 5 4 1 3 0 8 0
rtentry 112 876 0 776 4 1 3 4 0 8 0
unpcb 144 2036 0 2018 28 27 1 9 0 8 0
syncache 336 4 0 4 3 3 0 1 0 8 0
tcpcb 808 578 0 572 12 11 1 5 0 8 0
arp 120 167 0 148 1 0 1 1 0 8 0
inpcb 384 3036 0 3025 43 38 5 12 0 8 3
nd6 136 231 0 206 3 2 1 2 0 8 0
pkpcb 40 15 0 15 2 2 0 1 0 8 0
kcovpl 48 71 0 63 1 0 1 1 0 8 0
ppxss 1168 9 0 9 3 3 0 1 0 8 0
pffrag 232 20 0 18 2 1 1 1 0 482 0
pffrnode 88 20 0 18 2 1 1 1 0 8 0
pffrent 40 30 0 28 2 1 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
pftag 88 1 0 0 1 0 1 1 0 8 0
pfqueue 264 1 0 0 1 0 1 1 0 8 0
pfstitem 24 190 0 162 1 0 1 1 0 8 0
pfstkey 128 190 0 162 2 0 2 2 0 8 0
pfstate 376 190 0 162 6 2 4 6 0 8 1
pfrule 1344 25 0 20 2 1 1 2 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 3417 0 2973 33 5 28 31 0 8 0
art_table 32 3418 0 2973 5 1 4 5 0 8 0
art_node 16 874 0 786 1 0 1 1 0 8 0
sysvmsgpl 40 11 0 7 1 0 1 1 0 8 0
semapl 112 193 0 183 1 0 1 1 0 8 0
shmpl 112 66 0 2 2 0 2 2 0 8 0
dirhash 1024 56 0 37 3 0 3 3 0 8 0
dino2pl 256 4449 0 2812 103 0 103 103 0 8 0
ffsino 272 4449 0 2812 110 0 110 110 0 8 0
nchpl 144 6897 0 6255 66 40 26 66 0 8 0
uvmvnodes 80 6389 0 0 131 0 131 131 0 8 0
vnodes 216 6389 0 0 355 0 355 355 0 8 0
namei 1024 33549 0 33548 9 8 1 2 0 8 0
percpumem 16 130 0 81 1 0 1 1 0 8 0
vcpupl 3904 4 0 0 1 0 1 1 0 8 0
vmpool 696 7 0 3 1 0 1 1 0 8 0
kstatmem 264 192 0 162 4 2 2 3 0 8 0
scsiplug 72 6 0 6 2 2 0 1 0 8 0
scxspl 216 45217 0 45216 18 17 1 8 1 8 0
plimitpl 152 700 0 682 1 0 1 1 0 8 0
sigapl 424 2694 0 2624 11 2 9 9 0 8 0
futexpl 64 28554 0 28550 8 7 1 1 0 8 0
knotepl 120 639 0 0 19 2 17 18 0 8 0
kqueuepl 216 588 0 578 4 3 1 3 0 8 0
pipepl 320 596 0 569 10 7 3 7 0 8 0
fdescpl 496 2653 0 2623 8 3 5 5 0 8 0
filepl 152 19398 0 19136 53 39 14 19 0 8 2
lockfpl 104 635 0 632 1 0 1 1 0 8 0
lockfspl 48 275 0 272 1 0 1 1 0 8 0
sessionpl 144 86 0 77 1 0 1 1 0 8 0
pgrppl 48 173 0 156 1 0 1 1 0 8 0
ucredpl 104 2925 0 2910 1 0 1 1 0 8 0
zombiepl 144 2625 0 2624 1 0 1 1 0 8 0
processpl 1152 2694 0 2624 7 1 6 6 0 8 0
procpl 648 5262 0 5187 10 2 8 8 0 8 0
srpgc 96 4 0 4 2 2 0 1 0 8 0
sosppl 168 10 0 10 4 4 0 1 0 8 0
sockpl 664 5613 0 5580 66 60 6 20 0 8 3
mcl64k 65536 2 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 5 0 0 1 0 1 1 0 8 0
mcl4k 4096 3 0 0 1 0 1 1 0 8 0
mcl2k 2048 263 0 0 31 2 29 31 0 8 0
mtagpl 96 23 0 0 1 0 1 1 0 8 0
mbufpl 256 565 0 0 25 0 25 25 0 8 0
bufpl 280 12661 0 4827 560 0 560 560 0 8 0
anonpl 24 429966 0 426471 122 67 55 81 0 185 18
amapchunkpl 152 70500 0 70048 69 36 33 42 0 158 13
amappl16 200 8706 0 8690 65 61 4 15 0 8 2
amappl15 192 21 0 21 1 1 0 1 0 8 0
amappl14 184 248 0 235 1 0 1 1 0 8 0
amappl13 176 2 0 2 1 1 0 1 0 8 0
amappl12 168 4302 0 4270 4 2 2 3 0 8 0
amappl11 160 58 0 44 1 0 1 1 0 8 0
amappl10 152 15 0 15 1 1 0 1 0 8 0
amappl9 144 121 0 120 1 0 1 1 0 8 0
amappl8 136 21 0 18 1 0 1 1 0 8 0
amappl7 128 233 0 221 1 0 1 1 0 8 0
amappl6 120 800 0 799 1 0 1 1 0 8 0
amappl5 112 389 0 378 1 0 1 1 0 8 0
amappl4 104 512 0 491 1 0 1 1 0 8 0
amappl3 96 13774 0 13664 4 0 4 4 0 8 0
amappl2 88 1515 0 1450 2 0 2 2 0 8 0
amappl1 80 18678 0 18094 15 1 14 14 0 8 0
amappl 88 20682 0 20522 6 1 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 68 0 2 2 0 2 2 0 8 0
uaddrrnd 24 2660 0 2626 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2660 0 2626 1 0 1 1 0 8 0
vmmpekpl 168 23758 0 23704 3 0 3 3 0 8 0
vmmpepl 168 167755 0 165929 133 43 90 98 0 357 5
vmsppl 440 2659 0 2626 7 2 5 5 0 8 0
rwobjpl 56 54670 0 47288 111 6 105 105 0 8 0
pdppl 4096 5327 0 5256 185 108 77 85 0 8 6
pvpl 32 44654 0 0 361 1 360 360 0 265 0
pmappl 248 2659 0 2626 3 0 3 3 0 8 0
extentpl 40 56 0 38 1 0 1 1 0 8 0
phpool 112 524 0 142 11 0 11 11 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:437
panic(ffffffff830e3e0b) at panic+0x1e5 sys/kern/subr_prf.c:198
vclean(fffffd80677d0a38,8,ffff80002f7742d0) at vclean+0x482 sys/kern/vfs_subr.c:1065
vgonel(fffffd80677d0a38,ffff80002f7742d0) at vgonel+0xec sys/kern/vfs_subr.c:1197
vcount(fffffd807525ee68) at vcount+0x179 sys/kern/vfs_subr.c:1298
spec_close(ffff80003719a0e0) at spec_close+0x219 sys/kern/spec_vnops.c:524
VOP_CLOSE(fffffd807525ee68,1,fffffd807f7d38f0,ffff80002f7742d0) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd8071b96390,ffff80002f7742d0) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd8071b96390,ffff80002f7742d0) at vn_closefile+0x12b sys/kern/vfs_vnops.c:609
fdrop(fffffd8071b96390,ffff80002f7742d0) at fdrop+0x126 sys/kern/kern_descrip.c:1274
closef(fffffd8071b96390,ffff80002f7742d0) at closef+0x192 sys/kern/kern_descrip.c:1258
fdfree(ffff80002f7742d0) at fdfree+0x116 sys/kern/kern_descrip.c:1190
exit1(ffff80002f7742d0,0,0,1) at exit1+0x71b sys/kern/kern_exit.c:221
sys_exit(ffff80002f7742d0,ffff80003719a460,ffff80003719a3b0) at sys_exit+0x1a
syscall(ffff80003719a460) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80003719a460) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7c167c25a600, count: -15
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393
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(ffffffff83564540) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline]
__mp_lock(ffffffff83564540) at __mp_lock+0x192 sys/kern/kern_lock.c:144
syscall(ffff80002a06aae0) at syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80002a06aae0) at syscall+0xad6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d44a8d83d60, count: 9
ddb{1}> trace
x86_ipi_db(ffff800029b7bff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:393
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(ffffffff83564540) at __mp_lock+0x192 __mp_lock_spin sys/kern/kern_lock.c:113 [inline]
__mp_lock(ffffffff83564540) at __mp_lock+0x192 sys/kern/kern_lock.c:144
syscall(ffff80002a06aae0) at syscall+0xad6 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff80002a06aae0) at syscall+0xad6 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7d44a8d83d60, count: -6