Wpanic: AkeRrnNeIlN dGi: agSPnosL tNiOc aTs sLeOrtWEiRoEn D "reOfNs S!Y=S C~0AL"L f7a4i le-1d8:1 fil7e2 14"/97s6y zEkaXlIlTe r/m0a naa
geStopped at savectx+0xae: movl $0,%gs:0x688
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 16616 3070 0 0 0 0 syz-executor
savectx() at savectx+0xae
end of kernel
end trace frame: 0x763b7a5a6ff0, count: 14
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
*cpu1: kernel diagnostic assertion "refs != ~0" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_synch.c", line 951
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x763b7a5a6ff0, count: -1
ddb{0}> show registers
rdi 0
rsi 0
rbp 0xffff800037bee470
rbx 0
rdx 0
rcx 0xffff8000ffff1c50
rax 0x3c
r8 0xffff800037bee3a0
r9 0
r10 0xa39d15e0f776f4e8
r11 0xb511e88e526526a2
r12 0
r13 0
r14 0xffff8000ffff1c50
r15 0
rip 0xffffffff824d03ee savectx+0xae
cs 0x8
rflags 0x46
rsp 0xffff800037bee3f0
ss 0x10
savectx+0xae: movl $0,%gs:0x688
ddb{0}> show proc
PROC (syz-executor) tid=16616 pid=3070 tcnt=2 stat=onproc
flags process=0 proc=0
runpri=50, usrpri=86, slppri=17, nice=20
wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
forw=0xffffffffffffffff, list=0xffff8000fffe5c60,0xffff8000ffff02c0
process=0xffff80003bc0b0a0 user=0xffff800037be9000, vmspace=0xfffffd805e97b988
estcpu=36, cpticks=3, pctcpu=0.0, user=0, sys=2, intr=1
ddb{0}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
* 3070 16616 25664 0 7 0 syz-executor
3070 186612 25664 0 3 0x4000080 fsleep syz-executor
13028 388350 18291 0 3 0x80 nanoslp syz-executor
13028 255209 18291 0 2 0x4000000 syz-executor
95864 417688 85257 0 3 0x80 nanoslp syz-executor
95864 497131 85257 0 3 0x4000080 netcon syz-executor
95864 436151 85257 0 3 0x4000080 fsleep syz-executor
43327 228374 37444 0 2 0x2 syz-executor
85627 449397 39725 0 3 0x3000 suspend syz-executor
85627 108738 39725 0 3 0x4081000 biowait syz-executor
85627 121617 39725 0 3 0x4081000 inode syz-executor
57081 106135 1 0 3 0x100083 ttyin getty
39147 172056 0 0 3 0x14200 bored sosplice
7799 19101 37444 0 3 0x82 nanoslp syz-executor
94724 302259 37444 0 3 0x82 wait syz-executor
85257 269364 37444 0 3 0x82 nanoslp syz-executor
31634 11825 37444 0 2 0x2 syz-executor
39725 407548 37444 0 3 0x82 nanoslp syz-executor
18291 225407 37444 0 3 0x82 nanoslp syz-executor
25664 263795 37444 0 3 0x82 nanoslp syz-executor
37444 222889 37230 0 2 0x2 syz-executor
37230 173424 38790 0 3 0x10008a sigsusp ksh
38790 373502 84922 0 3 0x98 kqread sshd-session
84922 449355 74263 0 3 0x92 kqread sshd-session
74263 395758 1 0 3 0x88 kqread sshd
632 195647 52811 74 3 0x1100092 bpf pflogd
52811 430366 1 0 3 0x80 sbwait pflogd
16524 487096 83468 73 3 0x1100090 kqread syslogd
83468 118601 1 0 3 0x100082 sbwait syslogd
32978 494914 1 0 2 0x100000 resolvd
29091 367624 83936 77 2 0x100012 dhcpleased
18036 201441 83936 77 3 0x100092 kqread dhcpleased
83936 27577 1 0 3 0x80 kqread dhcpleased
54563 42126 0 0 3 0x14200 bored smr
10663 251605 0 0 3 0x14200 pgzero zerothread
9160 463948 0 0 3 0x14200 aiodoned aiodoned
75699 420983 0 0 3 0x14200 syncer update
25033 79159 0 0 3 0x14200 cleaner cleaner
87265 435534 0 0 3 0x14200 reaper reaper
61750 41627 0 0 3 0x14200 pgdaemon pagedaemon
59613 344424 0 0 3 0x14200 bored viomb
64801 149919 0 0 3 0x40014200 acpi0 acpi0
57448 302046 0 0 3 0x40014200 idle1
2214 438515 0 0 3 0x14200 bored softnet3
56761 20680 0 0 3 0x14200 bored softnet2
20684 155253 0 0 3 0x14200 bored softnet1
81255 412557 0 0 2 0x14200 softnet0
79902 94622 0 0 3 0x14200 bored systqmp
72544 167945 0 0 3 0x14200 bored systq
50992 97676 0 0 3 0x14200 tmoslp softclockmp
55930 99397 0 0 3 0x40014200 tmoslp softclock
31255 258494 0 0 3 0x40014200 idle0
1 329360 0 0 3 0x80082 wait init
0 0 -1 0 3 0x10010200 scheduler swapper
ddb{0}> show all locks
CPU 0:
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806bf40810)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 pmap_write_protect+0x87 rcr3 machine/cpufunc.h:139 [inline]
#3 pmap_write_protect+0x87 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#3 pmap_write_protect+0x87 sys/arch/amd64/amd64/pmap.c:2163
#4 uvm_map_protect+0xbcd pmap_protect machine/pmap.h:476 [inline]
#4 uvm_map_protect+0xbcd sys/uvm/uvm_map.c:3191
#5 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590
#6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637
#7 Xsyscall+0x128
Process 3070 (syz-executor) thread 0xffff8000ffff1c50 (16616)
exclusive rwlock uobjlk r = 0 (0xfffffd806cfad9b8)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 uvm_map_protect+0xb6e sys/uvm/uvm_map.c:3191
#3 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590
#4 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637
#5 Xsyscall+0x128
exclusive rwlock vmmaplk r = 0 (0xfffffd805e97ba88)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 vm_map_lock_ln+0x12e sys/uvm/uvm_map.c:5168
#3 uvm_map_protect+0xe1 sys/uvm/uvm_map.c:3064
#4 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590
#5 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637
#6 Xsyscall+0x128
exclusive mutex &pmap->pm_mtx r = 0 (0xfffffd806bf40810)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 mtx_enter_try+0x1ad sys/kern/kern_lock.c:311
#2 mtx_enter+0x62 sys/kern/kern_lock.c:261
#3 pmap_write_protect+0x87 rcr3 machine/cpufunc.h:139 [inline]
#3 pmap_write_protect+0x87 pmap_map_ptes sys/arch/amd64/amd64/pmap.c:437 [inline]
#3 pmap_write_protect+0x87 sys/arch/amd64/amd64/pmap.c:2163
#4 uvm_map_protect+0xbcd pmap_protect machine/pmap.h:476 [inline]
#4 uvm_map_protect+0xbcd sys/uvm/uvm_map.c:3191
#5 sys_mprotect+0x34c sys/uvm/uvm_mmap.c:590
#6 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#6 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637
#7 Xsyscall+0x128
Process 85627 (syz-executor) thread 0xffff8000ffff0a60 (108738)
exclusive rrwlock inode r = 0 (0xfffffd806bdd52e0)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605
#3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vn_write+0x190 sys/kern/vfs_vnops.c:405
#6 dofilewritev+0x23c sys/kern/sys_generic.c:380
#7 sys_write+0xa2 sys/kern/sys_generic.c:300
#8 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#8 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637
#9 Xsyscall+0x128
Process 85627 (syz-executor) thread 0xffff8000fffe54b0 (121617)
exclusive rrwlock inode r = 0 (0xfffffd806d84e8a8)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 rw_do_enter_write+0x377 sys/kern/kern_rwlock.c:310
#2 rrw_enter+0xc6 sys/kern/kern_rwlock.c:605
#3 VOP_LOCK+0xa6 sys/kern/vfs_vops.c:527
#4 vn_lock+0xa4 sys/kern/vfs_vnops.c:570
#5 vfs_lookup+0x109 sys/kern/vfs_lookup.c:418
#6 namei+0x7aa sys/kern/vfs_lookup.c:250
#7 uipc_bind+0x2f4 sys/kern/uipc_usrreq.c:371
#8 sys_bind+0x28a sys/kern/uipc_syscalls.c:189
#9 syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#9 syscall+0xbc6 sys/arch/amd64/amd64/trap.c:637
#10 Xsyscall+0x128
Process 81255 (softnet0) thread 0xffff8000ffffe000 (412557)
shared rwlock softnet0 r = 0 (0xffff80000002c078)
#0 witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0 witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1 taskq_thread+0x12a sys/kern/kern_task.c:442
#2 proc_trampoline+0x10
ddb{0}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10210 11025K 11365K 166960K 12228 0
pcb 17 12K 12K 166960K 168 0
rtable 212 7K 8K 166960K 509 0
pf 35 17K 81K 166960K 108 0
ifaddr 40 7K 7K 166960K 84 0
ifgroup 56 2K 2K 166960K 132 0
sysctl 3 1K 9K 166960K 12 0
counters 70 37K 37K 166960K 130 0
ioctlops 0 0K 4K 166960K 1586 0
iov 0 0K 16K 166960K 40 0
mount 1 1K 1K 166960K 1 0
log 0 0K 0K 166960K 4 0
vnodes 1329 84K 84K 166960K 2079 0
UFS quota 1 32K 32K 166960K 1 0
UFS mount 5 36K 36K 166960K 5 0
shm 2 16K 20K 166960K 14 0
VM map 2 1K 1K 166960K 2 0
sem 12 0K 0K 166960K 19 0
dirhash 12 2K 2K 166960K 24 0
ACPI 1692 195K 286K 166960K 12470 0
file desc 16 57K 97K 166960K 2369 0
sigio 0 0K 0K 166960K 19 0
proc 72 91K 152K 166960K 639 0
subproc 72 4K 4K 166960K 81 0
NFS srvsock 1 0K 0K 166960K 1 0
NFS daemon 1 16K 16K 166960K 1 0
ip_moptions 0 0K 0K 166960K 118 0
in_multi 87 6K 7K 166960K 172 0
ether_multi 1 0K 0K 166960K 19 0
mrt 2 0K 0K 166960K 15 0
ISOFS mount 1 32K 32K 166960K 1 0
MSDOSFS mount 1 16K 16K 166960K 1 0
ttys 97 440K 440K 166960K 97 0
exec 0 0K 1K 166960K 459 0
fusefs mount 1 32K 32K 166960K 1 0
pfkey data 0 0K 0K 166960K 2 0
tdb 3 0K 0K 166960K 3 0
VM swap 8 62K 64K 166960K 10 0
UVM amap 234 168K 183K 166960K 20032 0
UVM aobj 8 2K 2K 166960K 10 0
pinsyscall 41 82K 108K 166960K 3485 0
memdesc 1 4K 4K 166960K 1 0
crypto data 1 1K 1K 166960K 1 0
ip6_options 0 0K 0K 166960K 57 0
NDP 14 0K 2K 166960K 54 0
temp 55 8690K 8945K 166960K 43366 0
kqueue 14 22K 26K 166960K 205 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 26 0 0 1 0 1 1 0 8 0
rtpcb 120 106 0 103 1 0 1 1 0 8 0
rtentry 176 147 0 52 6 0 6 6 0 8 0
unpcb 144 413 0 394 1 0 1 1 0 8 0
syncache 336 4 0 4 3 2 1 1 0 8 1
tcpcb 736 213 0 208 1 0 1 1 0 8 0
arp 128 25 0 5 1 0 1 1 0 8 0
inpcb 328 741 0 731 3 1 2 2 0 8 1
nd6 144 28 0 6 1 0 1 1 0 8 0
pkpcb 40 7 0 7 2 2 0 1 0 8 0
kcovpl 48 9 0 1 1 0 1 1 0 8 0
ppxss 1192 19 0 18 1 0 1 1 0 8 0
pppxif 1504 8 0 7 1 0 1 1 0 8 0
pffrag 232 4 0 2 1 0 1 1 0 482 0
pffrnode 88 4 0 2 1 0 1 1 0 8 0
pffrent 40 8 0 6 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 74 0 23 1 0 1 1 0 8 0
pfstkey 128 74 0 23 2 0 2 2 0 8 0
pfstate 384 74 0 23 6 0 6 6 0 8 0
pfrule 1344 23 0 17 2 1 1 2 0 8 0
rttmr 136 1 0 1 1 1 0 1 0 8 0
art_heap8 4096 2 0 0 2 0 2 2 0 8 0
art_heap4 256 609 0 206 29 2 27 29 0 8 0
art_table 32 611 0 206 4 0 4 4 0 8 0
art_node 16 143 0 59 1 0 1 1 0 8 0
sysvmsgpl 40 12 0 6 1 0 1 1 0 8 0
semupl 112 3 0 3 1 1 0 1 0 8 0
semapl 112 16 0 6 1 0 1 1 0 8 0
shmpl 112 7 0 2 1 0 1 1 0 8 0
dirhash 1024 25 0 8 3 0 3 3 0 8 0
dino2pl 256 4704 0 3203 95 0 95 95 0 8 0
ffsino 288 4704 0 3203 109 0 109 109 0 8 0
nchpl 144 7368 0 6841 63 31 32 63 0 8 8
uvmvnodes 80 5120 0 0 105 0 105 105 0 8 0
vnodes 216 5120 0 0 285 0 285 285 0 8 0
namei 1024 18555 0 18554 3 2 1 2 0 8 0
percpumem 16 80 0 30 1 0 1 1 0 8 0
kstatmem 264 72 0 46 3 0 3 3 0 8 0
acpiwqpl 32 1 0 1 1 0 1 1 1 8 1
scsiplug 72 6 0 6 1 0 1 1 0 8 1
scxspl 216 26706 0 26705 12 10 2 8 1 8 1
plimitpl 152 126 0 108 1 0 1 1 0 8 0
sigapl 424 2692 0 2643 9 2 7 9 0 8 0
knotepl 120 567 0 0 17 0 17 17 0 8 0
kqueuepl 224 216 0 205 1 0 1 1 0 8 0
pipepl 336 136 0 109 4 1 3 3 0 8 0
fdescpl 520 2650 0 2620 3 0 3 3 0 8 0
filepl 160 6733 0 6515 11 1 10 10 0 8 0
lockfpl 104 346 0 344 1 0 1 1 0 8 0
lockfspl 48 144 0 142 1 0 1 1 0 8 0
sessionpl 144 25 0 16 1 0 1 1 0 8 0
pgrppl 48 44 0 27 1 0 1 1 0 8 0
ucredpl 104 960 0 946 1 0 1 1 0 8 0
zombiepl 144 2646 0 2643 3 2 1 1 0 8 0
processpl 1240 2692 0 2643 7 2 5 6 0 8 0
procpl 656 5154 0 5099 7 1 6 7 0 8 0
srpgc 96 4 0 4 1 0 1 1 0 8 1
sockpl 728 1286 0 1254 6 2 4 4 0 8 0
mcl64k 65536 17 0 0 3 0 3 3 0 8 0
mcl16k 16384 17 0 0 3 0 3 3 0 8 0
mcl12k 12288 17 0 0 2 0 2 2 0 8 0
mcl9k 9216 17 0 0 2 0 2 2 0 8 0
mcl8k 8192 17 0 0 3 0 3 3 0 8 0
mcl4k 4096 122 0 0 16 0 16 16 0 8 0
mcl2k2 2112 2 0 0 1 0 1 1 0 8 0
mcl2k 2048 19 0 0 3 0 3 3 0 8 0
mtagpl 96 21 0 0 1 0 1 1 0 8 0
mbufpl 256 1211 0 0 76 0 76 76 0 8 0
bufpl 280 8852 0 2710 440 0 440 440 0 8 1
anonpl 32 8518 0 0 69 0 69 69 0 246 0
amapchunkpl 152 69564 0 69105 39 12 27 29 0 158 7
amappl16 200 5593 0 5329 41 27 14 18 0 8 0
amappl15 192 4 0 4 1 1 0 1 0 8 0
amappl14 184 116 0 104 1 0 1 1 0 8 0
amappl13 176 3 0 3 2 2 0 1 0 8 0
amappl12 168 3314 0 3284 3 1 2 2 0 8 0
amappl11 160 81 0 67 1 0 1 1 0 8 0
amappl10 152 29 0 29 2 2 0 1 0 8 0
amappl9 144 242 0 242 2 2 0 1 0 8 0
amappl8 136 33 0 31 1 0 1 1 0 8 0
amappl7 128 123 0 110 1 0 1 1 0 8 0
amappl6 120 180 0 177 2 1 1 1 0 8 0
amappl5 112 124 0 115 1 0 1 1 0 8 0
amappl4 104 321 0 301 1 0 1 1 0 8 0
amappl3 96 15237 0 15129 5 1 4 4 0 8 0
amappl2 88 652 0 592 2 0 2 2 0 8 0
amappl1 80 17382 0 16771 18 4 14 15 0 8 0
amappl 88 19223 0 19063 5 0 5 5 0 92 0
dma65536 65536 1 0 1 1 0 1 1 0 8 1
dma16384 16384 1 0 1 1 0 1 1 0 8 1
dma4096 4096 2 0 2 2 2 0 1 0 8 0
dma1024 1024 1 0 0 1 0 1 1 0 8 0
dma256 256 7 0 7 2 2 0 1 0 8 0
dma128 128 254 0 254 2 2 0 1 0 8 0
dma64 64 6 0 6 1 1 0 1 0 8 0
dma32 32 8 0 8 2 1 1 1 0 8 1
dma16 16 19 0 18 1 0 1 1 0 8 0
aobjpl 72 9 0 2 1 0 1 1 0 8 0
uaddrrnd 24 2650 0 2620 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 2650 0 2620 1 0 1 1 0 8 0
vmmpekpl 168 18089 0 18047 2 0 2 2 0 8 0
vmmpepl 168 158176 0 155999 109 6 103 103 0 357 3
vmsppl 480 2649 0 2620 6 1 5 5 0 8 0
rwobjpl 72 40929 0 34638 115 0 115 115 0 8 0
pdppl 4096 5307 0 5240 108 35 73 87 0 8 6
pvpl 32 17543 0 0 142 1 141 141 0 265 0
pmappl 256 2649 0 2620 3 0 3 3 0 8 0
extentpl 40 45 0 27 1 0 1 1 0 8 0
phpool 112 471 0 46 13 0 13 13 0 8 0
ddb{0}> machine ddbcpu 0
Invalid cpu 0
ddb{0}> trace
savectx() at savectx+0xae
end of kernel
end trace frame: 0x763b7a5a6ff0, count: -1
ddb{0}> machine ddbcpu 1
Stopped at x86_ipi_db+0x27: addq $0x8,%rsp
x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666
acpitimer_delay(1) at acpitimer_delay+0x175 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline]
acpitimer_delay(1) at acpitimer_delay+0x175 sys/dev/acpi/acpitimer.c:125
comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269
cnputc(65) at cnputc+0x61 sys/dev/cons.c:218
db_putchar(65) at db_putchar+0x65c sys/ddb/db_output.c:155
kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065
db_printf(ffffffff833fc7d0) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff83469383) at panic+0x103 sys/kern/subr_prf.c:216
__assert(ffffffff83414efe,ffffffff8341d686,3b7,ffffffff8341d709) at __assert+0x29 sys/kern/subr_prf.c:-1
refcnt_finalize(ffff80003c445788,ffffffff8335de51) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952
pppx_if_destroy(0,ffff80003c445780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806
end trace frame: 0xffff80002a3489c0, count: 0
ddb{1}> trace
x86_ipi_db(ffff8000299ddff0) at x86_ipi_db+0x27 sys/arch/amd64/amd64/db_interface.c:394
x86_ipi_handler() at x86_ipi_handler+0xd9 sys/arch/amd64/amd64/ipi.c:106
Xresume_lapic_ipi() at Xresume_lapic_ipi+0x27
x86_bus_space_io_read_4(b008,0) at x86_bus_space_io_read_4+0x37 sys/arch/amd64/amd64/bus_space.c:666
acpitimer_delay(1) at acpitimer_delay+0x175 acpitimer_read sys/dev/acpi/acpitimer.c:141 [inline]
acpitimer_delay(1) at acpitimer_delay+0x175 sys/dev/acpi/acpitimer.c:125
comcnputc(800,65) at comcnputc+0x29b sys/dev/ic/com.c:1269
cnputc(65) at cnputc+0x61 sys/dev/cons.c:218
db_putchar(65) at db_putchar+0x65c sys/ddb/db_output.c:155
kprintf() at kprintf+0x2aba sys/kern/subr_prf.c:1065
db_printf(ffffffff833fc7d0) at db_printf+0x9b sys/kern/subr_prf.c:-1
panic(ffffffff83469383) at panic+0x103 sys/kern/subr_prf.c:216
__assert(ffffffff83414efe,ffffffff8341d686,3b7,ffffffff8341d709) at __assert+0x29 sys/kern/subr_prf.c:-1
refcnt_finalize(ffff80003c445788,ffffffff8335de51) at refcnt_finalize+0x1db sys/kern/kern_synch.c:952
pppx_if_destroy(0,ffff80003c445780) at pppx_if_destroy+0x3d sys/net/if_pppx.c:806
pppxclose(205b9a,1,2000,ffff8000ffff0020) at pppxclose+0xa0 sys/net/if_pppx.c:553
spec_close(ffff80002a348a40) at spec_close+0x412 sys/kern/spec_vnops.c:-1
VOP_CLOSE(fffffd806ff5c2d8,1,fffffd80097fb750,ffff8000ffff0020) at VOP_CLOSE+0x133 sys/kern/vfs_vops.c:156
vn_closefile(fffffd806d2ffc98,ffff8000ffff0020) at vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
vn_closefile(fffffd806d2ffc98,ffff8000ffff0020) at vn_closefile+0x12b sys/kern/vfs_vnops.c:615
fdrop(fffffd806d2ffc98,ffff8000ffff0020) at fdrop+0x126 sys/kern/kern_descrip.c:1267
closef(fffffd806d2ffc98,ffff8000ffff0020) at closef+0x192 sys/kern/kern_descrip.c:1251
fdfree(ffff8000ffff0020) at fdfree+0x116 sys/kern/kern_descrip.c:1182
exit1(ffff8000ffff0020,0,0,1) at exit1+0x59c sys/kern/kern_exit.c:215
sys_exit(ffff8000ffff0020,ffff80002a348db0,ffff80002a348d00) at sys_exit+0x1a sys/kern/kern_exit.c:-1
syscall(ffff80002a348db0) at syscall+0xb08 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002a348db0) at syscall+0xb08 sys/arch/amd64/amd64/trap.c:637
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7ecd44367540, count: -25