panic: kernel diagnostic assertion "len >= 0 &panic: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 677
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
* 71626 96774 0 0 0 1 syz-executor.1
84999 95272 0 0 0x4000000 0 syz-executor.0
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161
proc_trampoline_mp() at proc_trampoline_mp+0x131
end trace frame: 0x0, count: 11
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
*cpu0: kernel diagnostic assertion "len >= 0 && !M_READONLY(m)" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/uipc_mbuf.c", line 1384
cpu1: kernel diagnostic assertion "!_kernel_lock_held()" failed: file "/syzkaller/managers/multicore/kernel/sys/kern/kern_fork.c", line 677
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161
proc_trampoline_mp() at proc_trampoline_mp+0x131
end trace frame: 0x0, count: -4
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff800022c6aa90
rbx 0xffff800020ce9bff
rdx 0
rcx 0
rax 0xffff80002c34d510
r8 0x101010101010101
r9 0x8080808080808080
r10 0x540016704692ab
r11 0x4c8cec2ff59e0a75
r12 0xffff800020ce9a00
r13 0
r14 0xffffffff828eca00 cpu_info_full_primary+0x2a00
r15 0x1
rip 0xffffffff82237da8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff800022c6aa80
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.1) pid=71626 stat=onproc
flags process=0 proc=0
pri=83, usrpri=83, nice=20
forw=0xffffffffffffffff, list=0xffff80002c34da50,0xffff80002c34d280
process=0xffff80002c1454e0 user=0xffff800022c65000, vmspace=0xfffffd8067e26178
estcpu=33, cpticks=1, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
40697 425016 45521 0 2 0 syz-executor.5
40697 391520 45521 0 3 0x4000080 fsleep syz-executor.5
33384 208122 45021 0 2 0 syz-executor.2
*96774 71626 51673 0 7 0 syz-executor.1
95272 39738 3059 0 2 0 syz-executor.0
95272 84999 3059 0 7 0x4000000 syz-executor.0
81704 259349 547 0 2 0 syz-executor.6
27820 338450 80962 0 2 0 syz-executor.3
63408 388752 95451 0 2 0 syz-executor.7
63408 178775 95451 0 3 0x4000080 fsleep syz-executor.7
16208 428874 19640 0 2 0 syz-executor.4
45521 494145 94902 0 3 0x82 nanoslp syz-executor.5
3059 346489 94902 0 3 0x82 nanoslp syz-executor.0
19640 141860 94902 0 3 0x82 nanoslp syz-executor.4
8016 516277 0 0 3 0x14200 acct acct
45021 454330 94902 0 3 0x82 nanoslp syz-executor.2
80962 193398 94902 0 3 0x82 nanoslp syz-executor.3
85161 207231 1 0 3 0x100083 ttyin getty
547 300767 94902 0 3 0x82 nanoslp syz-executor.6
4650 132250 0 0 3 0x14280 nfsidl nfsio
33560 220289 0 0 3 0x14280 nfsidl nfsio
98451 465984 0 0 3 0x14280 nfsidl nfsio
823 4513 0 0 3 0x14280 nfsidl nfsio
85022 325359 0 0 3 0x14280 nfsidl nfsio
90297 369945 0 0 3 0x14280 nfsidl nfsio
80346 102686 0 0 3 0x14280 nfsidl nfsio
58281 55977 0 0 3 0x14280 nfsidl nfsio
82025 180003 0 0 3 0x14280 nfsidl nfsio
10422 183853 0 0 3 0x14280 nfsidl nfsio
24029 492636 0 0 3 0x14280 nfsidl nfsio
12177 450949 0 0 3 0x14280 nfsidl nfsio
11390 422379 0 0 3 0x14280 nfsidl nfsio
20676 487127 0 0 3 0x14280 nfsidl nfsio
79276 226282 0 0 3 0x14280 nfsidl nfsio
84461 394549 0 0 3 0x14280 nfsidl nfsio
25661 101214 0 0 3 0x14280 nfsidl nfsio
83034 469420 0 0 3 0x14280 nfsidl nfsio
44703 314163 0 0 3 0x14280 nfsidl nfsio
11259 326334 0 0 3 0x14280 nfsidl nfsio
98240 75787 0 0 3 0x14200 bored sosplice
95451 436460 94902 0 3 0x82 nanoslp syz-executor.7
51673 85880 94902 0 2 0x2 syz-executor.1
94902 122826 33383 0 3 0x82 thrsleep syz-fuzzer
94902 6395 33383 0 3 0x4000082 thrsleep syz-fuzzer
94902 360657 33383 0 3 0x4000082 thrsleep syz-fuzzer
94902 473334 33383 0 3 0x4000082 thrsleep syz-fuzzer
94902 446442 33383 0 3 0x4000082 thrsleep syz-fuzzer
94902 43329 33383 0 3 0x4000082 thrsleep syz-fuzzer
94902 502675 33383 0 3 0x4000082 thrsleep syz-fuzzer
94902 124929 33383 0 3 0x4000082 kqread syz-fuzzer
94902 123291 33383 0 3 0x4000082 thrsleep syz-fuzzer
33383 351242 92552 0 3 0x10008a sigsusp ksh
92552 335788 91896 0 3 0x9a kqread sshd
91896 175150 1 0 3 0x88 kqread sshd
51059 350045 53772 74 3 0x100092 bpf pflogd
53772 440040 1 0 3 0x80 netio pflogd
40061 47318 9042 73 3 0x100090 kqread syslogd
9042 347614 1 0 3 0x100082 netio syslogd
64656 124510 1 0 3 0x100080 kqread resolvd
19276 211544 25169 77 3 0x100092 kqread dhcpleased
7947 413841 25169 77 3 0x100092 kqread dhcpleased
25169 204596 1 0 3 0x80 kqread dhcpleased
91215 390572 0 0 3 0x14200 bored smr
95135 124958 0 0 2 0x14200 zerothread
81231 521498 0 0 3 0x14200 aiodoned aiodoned
22351 114054 0 0 3 0x14200 syncer update
32886 295640 0 0 3 0x14200 cleaner cleaner
11505 59957 0 0 3 0x14200 reaper reaper
35167 52235 0 0 3 0x14200 pgdaemon pagedaemon
80832 341617 0 0 3 0x14200 bored viomb
94761 414030 0 0 3 0x40014200 acpi0 acpi0
48540 204700 0 0 3 0x40014200 idle1
52470 42865 0 0 3 0x14200 bored softnet
59127 213274 0 0 3 0x14200 bored systqmp
40564 236042 0 0 3 0x14200 bored systq
4118 257308 0 0 3 0x40014200 bored softclock
69467 518042 0 0 3 0x40014200 idle0
1 461038 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
Process 95272 (syz-executor.0) thread 0xffff8000211437a8 (84999)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82ac44c8)
#0 witness_lock+0x44d
#1 vn_write+0x42 sys/kern/vfs_vnops.c:399
#2 dofilewritev+0x19c sys/kern/sys_generic.c:381
#3 sys_write+0x83 sys/kern/sys_generic.c:301
#4 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#4 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#5 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10214 6563K 7278K 78643K 32051 0
pcb 13 18K 20K 78643K 1025 0
rtable 253 11K 15K 78643K 1847 0
ifaddr 102 22K 23K 78643K 1264 0
sysctl 2 0K 0K 78643K 2 0
counters 58 35K 36K 78643K 176 0
ioctlops 0 0K 4K 78643K 2943 0
iov 0 0K 24K 78643K 570 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1433 90K 90K 78643K 8111 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 56 0
VM map 2 1K 1K 78643K 2 0
sem 13 5K 10K 78643K 80 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12548 0
file desc 18 65K 85K 78643K 7651 0
sigio 0 0K 0K 78643K 25 0
proc 70 87K 124K 78643K 1360 0
subproc 104 6K 6K 78643K 376 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 0 0K 0K 78643K 450 0
in_multi 99 6K 6K 78643K 542 0
ether_multi 1 0K 0K 78643K 84 0
mrt 1 0K 0K 78643K 49 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 175 784K 784K 78643K 175 0
exec 0 0K 2K 78643K 1531 0
pfkey data 0 0K 0K 78643K 4 0
tdb 3 0K 0K 78643K 3 0
pagedep 1 8K 8K 78643K 1 0
inodedep 1 32K 32K 78643K 1 0
newblk 1 0K 0K 78643K 1 0
VM swap 7 26K 26K 78643K 7 0
UVM amap 422 337K 338K 78643K 98317 0
UVM aobj 131 8K 8K 78643K 147 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 266 0
NDP 14 0K 2K 78643K 129 0
temp 142 4709K 4837K 78643K 72647 0
kqueue 13 20K 28K 78643K 578 0
SYN cache 2 16K 16K 78643K 2 0
ddb{1}> show all pools
Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle
plcache 128 22 0 0 1 0 1 1 0 8 0
rtpcb 120 331 0 328 5 4 1 3 0 8 0
rtentry 112 429 0 322 4 0 4 4 0 8 0
unpcb 136 3037 0 3022 33 32 1 6 0 8 0
syncache 296 28 0 28 7 7 0 1 0 8 0
tcpqe 32 23 0 23 3 3 0 1 0 8 0
tcpcb 736 3431 0 3427 97 90 7 17 0 8 6
arp 120 72 0 54 1 0 1 1 0 8 0
inpcb 304 7758 0 7751 99 90 9 16 0 8 8
rttmr 72 19 0 19 4 4 0 1 0 8 0
nd6 48 96 0 67 1 0 1 1 0 8 0
pkpcb 40 7 0 7 2 2 0 1 0 8 0
kcovpl 48 28 0 20 1 0 1 1 0 8 0
ppxss 1248 23 0 23 6 6 0 1 0 8 0
pfstscr 40 9 0 9 3 3 0 1 0 8 0
pffrag 232 27 0 24 2 1 1 1 0 482 0
pffrnode 88 27 0 24 2 1 1 1 0 8 0
pffrent 40 138 0 135 2 1 1 1 0 8 0
pfosfp 40 1434 0 1009 5 0 5 5 0 8 0
pfosfpen 112 1434 0 714 21 0 21 21 0 8 0
pfrktable 1344 250 0 244 5 4 1 2 0 8 0
pftag 88 103 0 98 4 3 1 1 0 8 0
pfstitem 24 74 0 72 1 0 1 1 0 8 0
pfstkey 112 98 0 96 2 1 1 2 0 8 0
pfstate 320 85 0 83 4 3 1 4 0 8 0
pfrule 1360 480 0 438 5 1 4 4 0 8 0
art_heap8 4096 4 0 3 3 2 1 3 0 8 0
art_heap4 256 1665 0 1191 40 10 30 31 0 8 0
art_table 32 1669 0 1194 4 0 4 4 0 8 0
art_node 16 428 0 334 1 0 1 1 0 8 0
sysvmsgpl 40 85 0 51 1 0 1 1 0 8 0
semupl 112 4 0 4 2 2 0 1 0 8 0
semapl 112 71 0 60 1 0 1 1 0 8 0
shmpl 112 144 0 16 4 0 4 4 0 8 0
dirhash 1024 17 0 0 3 0 3 3 0 8 0
dino2pl 256 12389 0 10941 92 0 92 92 0 8 0
ffsino 272 12389 0 10941 98 0 98 98 0 8 0
nchpl 144 23250 0 21625 63 0 63 63 0 8 0
uvmvnodes 80 5926 0 0 121 0 121 121 0 8 0
vnodes 224 5926 0 0 349 0 349 349 0 8 0
namei 1024 75103 0 75103 2 1 1 2 0 8 1
percpumem 16 100 0 59 1 0 1 1 0 8 0
vcpupl 2048 49 0 0 7 0 7 7 0 8 0
vmpool 560 55 0 6 4 0 4 4 0 8 0
pfiaddrpl 120 76 0 71 4 3 1 1 0 8 0
scsiplug 72 10 0 10 3 3 0 1 0 8 0
scxspl 216 63555 0 63555 21 20 1 8 0 8 1
plimitpl 152 861 0 846 1 0 1 1 0 8 0
sigapl 424 7938 0 7871 8 0 8 8 0 8 0
futexpl 64 79566 0 79564 1 0 1 1 0 8 0
knotepl 120 444 0 0 9 2 7 7 0 8 0
kqueuepl 216 1322 0 1313 18 17 1 5 0 8 0
pipepl 336 1577 0 1549 52 49 3 11 0 8 0
fdescpl 496 7902 0 7871 5 1 4 5 0 8 0
filepl 152 48346 0 48105 72 58 14 19 0 8 4
lockfpl 104 8251 0 8248 16 15 1 4 0 8 0
lockfspl 48 3834 0 3831 3 2 1 2 0 8 0
sessionpl 144 46 0 29 1 0 1 1 0 8 0
pgrppl 48 46 0 29 1 0 1 1 0 8 0
ucredpl 96 5103 0 5091 1 0 1 1 0 8 0
zombiepl 144 7871 0 7871 2 1 1 1 0 8 1
processpl 1064 7938 0 7871 5 0 5 5 0 8 0
procpl 672 22448 0 22370 18 10 8 9 0 8 0
srpgc 96 35 0 35 6 6 0 1 0 8 0
sosppl 168 47 0 47 4 4 0 1 0 8 0
sockpl 480 11135 0 11110 245 233 12 29 0 8 8
mcl64k 65536 25 0 0 4 1 3 3 0 8 0
mcl16k 16384 33 0 0 5 2 3 3 0 8 0
mcl12k 12288 26 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 18 0 0 3 0 3 3 0 8 0
mcl2k2 2112 10 0 0 1 0 1 1 0 8 0
mcl2k 2048 360 0 0 34 0 34 34 0 8 0
mtagpl 96 1365 0 0 33 0 33 33 0 8 0
mbufpl 256 1667 0 0 100 0 100 100 0 8 0
bufpl 288 15914 0 9578 453 0 453 453 0 8 0
anonpl 24 2177754 0 2159266 221 94 127 171 0 186 0
amapchunkpl 152 235708 0 234885 63 27 36 48 0 158 0
amappl16 200 19452 0 18824 94 59 35 59 0 8 1
amappl15 192 3358 0 3347 1 0 1 1 0 8 0
amappl14 184 56 0 51 1 0 1 1 0 8 0
amappl13 176 1049 0 1045 1 0 1 1 0 8 0
amappl12 168 635 0 631 1 0 1 1 0 8 0
amappl11 160 222 0 203 1 0 1 1 0 8 0
amappl10 152 576 0 567 1 0 1 1 0 8 0
amappl9 144 1899 0 1895 1 0 1 1 0 8 0
amappl8 136 1717 0 1617 4 0 4 4 0 8 0
amappl7 128 790 0 780 1 0 1 1 0 8 0
amappl6 120 1700 0 1674 2 1 1 2 0 8 0
amappl5 112 8100 0 8077 1 0 1 1 0 8 0
amappl4 104 1815 0 1782 2 1 1 2 0 8 0
amappl3 96 2690 0 2677 1 0 1 1 0 8 0
amappl2 88 1974 0 1924 7 5 2 3 0 8 0
amappl1 80 141736 0 141168 19 5 14 19 0 8 0
amappl 88 97350 0 97077 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 72 146 0 16 3 0 3 3 0 8 0
uaddrrnd 24 7957 0 7877 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 7957 0 7877 1 0 1 1 0 8 0
vmmpekpl 168 62882 0 62812 4 0 4 4 0 8 0
vmmpepl 168 720075 0 717297 227 92 135 145 0 357 6
vmsppl 368 7956 0 7877 9 1 8 8 0 8 0
rwobjpl 56 176938 0 169219 118 7 111 115 0 8 0
pdppl 4096 15921 0 15803 369 251 118 118 0 8 0
pvpl 32 3703269 0 3680334 386 181 205 271 0 265 0
pmappl 248 7956 0 7877 6 1 5 5 0 8 0
extentpl 40 58 0 38 1 0 1 1 0 8 0
phpool 112 1382 0 410 28 0 28 28 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff828ebff0) at x86_ipi_db+0x1a 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+0x23
__mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
cnputc(26) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(26) at db_putchar+0x3fc sys/ddb/db_output.c:155
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff825f2af2) at db_printf+0x85 sys/kern/subr_prf.c:502
panic(ffffffff82579a90) at panic+0xd7 sys/kern/subr_prf.c:220
__assert(ffffffff825ec6cc,ffffffff82560ab1,568,ffffffff8258f284) at __assert+0x25 sys/kern/subr_prf.c:161
m_align(fffffd807433ce00,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385
bpf_movein(ffff8000289081e8,ffff800000c9aa00,ffff800028907f48,ffff800028907e48) at bpf_movein+0x25e sys/net/bpf.c:228
end trace frame: 0xffff800028907fa0, count: 0
ddb{0}> trace
x86_ipi_db(ffffffff828ebff0) at x86_ipi_db+0x1a 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+0x23
__mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82ac42c0) at __mp_lock+0x122 sys/kern/kern_lock.c:147
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
cnputc(26) at cnputc+0x4b sys/dev/cons.c:239
db_putchar(26) at db_putchar+0x3fc sys/ddb/db_output.c:155
kprintf() at kprintf+0x20ec sys/kern/subr_prf.c:1068
db_printf(ffffffff825f2af2) at db_printf+0x85 sys/kern/subr_prf.c:502
panic(ffffffff82579a90) at panic+0xd7 sys/kern/subr_prf.c:220
__assert(ffffffff825ec6cc,ffffffff82560ab1,568,ffffffff8258f284) at __assert+0x25 sys/kern/subr_prf.c:161
m_align(fffffd807433ce00,ffffffd8) at m_align+0x1a0 sys/kern/uipc_mbuf.c:1385
bpf_movein(ffff8000289081e8,ffff800000c9aa00,ffff800028907f48,ffff800028907e48) at bpf_movein+0x25e sys/net/bpf.c:228
bpfwrite(31700,ffff8000289081e8,1) at bpfwrite+0x169 sys/net/bpf.c:644
spec_write(ffff800028908040) at spec_write+0xd4 sys/kern/spec_vnops.c:309
VOP_WRITE(fffffd8065a4e790,ffff8000289081e8,1,fffffd807f7d86c0) at VOP_WRITE+0xbf sys/kern/vfs_vops.c:245
vn_write(fffffd80635fad18,ffff8000289081e8,0) at vn_write+0x157 sys/kern/vfs_vnops.c:414
dofilewritev(ffff8000211437a8,3,ffff8000289081e8,0,ffff8000289082e0) at dofilewritev+0x19c sys/kern/sys_generic.c:381
sys_write(ffff8000211437a8,ffff800028908288,ffff8000289082e0) at sys_write+0x83 sys/kern/sys_generic.c:301
syscall(ffff800028908350) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff800028908350) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x3f82ec355f0, count: -22
ddb{0}> machine ddbcpu 1
Stopped at db_enter+0x18: addq $0x8,%rsp
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161
proc_trampoline_mp() at proc_trampoline_mp+0x131
end trace frame: 0x0, count: 11
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff82579a90) at panic+0x177 sys/kern/subr_prf.c:202
__assert(ffffffff825ec6cc,ffffffff825d3098,2a5,ffffffff825ab946) at __assert+0x25 sys/kern/subr_prf.c:161
proc_trampoline_mp() at proc_trampoline_mp+0x131
end trace frame: 0x0, count: -4