panic: pool_do_get: fdescpl free list modified: page 0xfffffd8067397000; item addr 0xfffffd80673977c0; offset 0x48=0xdeaf4153
Stopped at db_enter+0x18: addq $0x8,%rsp
TID PID UID PRFLAGS PFLAGS CPU COMMAND
*358210 24824 32767 0x10 0 1K syz-executor.7
363269 86362 0 0x2 0 0 syz-fuzzer
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff825d022a) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82a39eb8,9,ffff80002a53e1e8) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82a39eb8,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
fdcopy(ffff80002116c010) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1072 [inline]
fdcopy(ffff80002116c010) at fdcopy+0x44 sys/kern/kern_descrip.c:1111
process_new(ffff800027aff268,ffff80002116c010,1) at process_new+0x13b sys/kern/kern_fork.c:258
fork1(ffff8000ffff4fc8,1,ffffffff81975570,0,ffff80002a53e420,0) at fork1+0x30b sys/kern/kern_fork.c:382
syscall(ffff80002a53e490) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002a53e490) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe38b0, 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: pool_do_get: fdescpl free list modified: page 0xfffffd8067397000; item addr 0xfffffd80673977c0; offset 0x48=0xdeaf4153
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff825d022a) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82a39eb8,9,ffff80002a53e1e8) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82a39eb8,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
fdcopy(ffff80002116c010) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1072 [inline]
fdcopy(ffff80002116c010) at fdcopy+0x44 sys/kern/kern_descrip.c:1111
process_new(ffff800027aff268,ffff80002116c010,1) at process_new+0x13b sys/kern/kern_fork.c:258
fork1(ffff8000ffff4fc8,1,ffffffff81975570,0,ffff80002a53e420,0) at fork1+0x30b sys/kern/kern_fork.c:382
syscall(ffff80002a53e490) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002a53e490) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe38b0, count: -9
ddb{1}> show registers
rdi 0
rsi 0x1
rbp 0xffff80002a53e030
rbx 0xffff800020ce9bff
rdx 0
rcx 0
rax 0xffff8000ffff4fc8
r8 0x101010101010101
r9 0x8080808080808080
r10 0x63e6b304ec91cc0c
r11 0xab8ddeb0736b36c1
r12 0xffff800020ce9a00
r13 0
r14 0
r15 0x1
rip 0xffffffff810814b8 db_enter+0x18
cs 0x8
rflags 0x246
rsp 0xffff80002a53e020
ss 0x10
db_enter+0x18: addq $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor.7) pid=358210 stat=onproc
flags process=10<SUGID> proc=0
pri=17, usrpri=86, nice=20
forw=0xffffffffffffffff, list=0xffff8000ffff5ce8,0xffff8000fffeed40
process=0xffff80002116c010 user=0xffff80002a539000, vmspace=0xfffffd806ca838b0
estcpu=36, cpticks=2, pctcpu=0.0
user=0, sys=1, intr=0
ddb{1}> ps
PID TID PPID UID S FLAGS WAIT COMMAND
28811 351933 73985 32767 2 0x10 syz-executor.3
66677 88815 17450 32767 2 0x10 syz-executor.2
47520 430254 9876 32767 2 0x10 syz-executor.1
74943 3379 59908 32767 2 0x10 syz-executor.6
60715 307095 35502 32767 2 0x10 syz-executor.4
60715 135162 35502 32767 3 0x4000090 fsleep syz-executor.4
60715 235159 35502 32767 2 0x4000010 syz-executor.4
68290 118350 928 32767 2 0x10 syz-executor.0
68290 143690 928 32767 3 0x4000090 fsleep syz-executor.0
60706 415564 18173 32767 3 0x90 nanoslp syz-executor.5
60706 72267 18173 32767 3 0x4000090 fsleep syz-executor.5
60706 470896 18173 32767 3 0x4000090 fsleep syz-executor.5
60706 438910 18173 32767 3 0x4000010 fdlock syz-executor.5
73985 233210 52600 32767 3 0x90 nanoslp syz-executor.3
52600 280646 86362 0 3 0x82 wait syz-executor.3
18173 448946 94095 32767 3 0x90 nanoslp syz-executor.5
94095 268972 86362 0 3 0x82 wait syz-executor.5
*24824 358210 79655 32767 7 0x10 syz-executor.7
79655 271694 86362 0 3 0x82 wait syz-executor.7
928 62473 51548 32767 3 0x90 nanoslp syz-executor.0
51548 129235 86362 0 3 0x82 wait syz-executor.0
59908 213003 61627 32767 3 0x90 nanoslp syz-executor.6
61627 229668 86362 0 3 0x82 wait syz-executor.6
35502 38441 37320 32767 3 0x90 nanoslp syz-executor.4
37320 61842 86362 0 3 0x82 wait syz-executor.4
17450 2387 43230 32767 3 0x90 nanoslp syz-executor.2
43230 58493 86362 0 3 0x82 wait syz-executor.2
1062 467225 0 0 3 0x14200 bored sosplice
9876 345031 20085 32767 3 0x90 nanoslp syz-executor.1
20085 327370 86362 0 3 0x82 wait syz-executor.1
86362 363269 87823 0 7 0x2 syz-fuzzer
86362 229185 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 253369 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 511816 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 359618 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 285474 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 460274 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 478617 87823 0 3 0x4000082 thrsleep syz-fuzzer
86362 260138 87823 0 3 0x4000082 thrsleep syz-fuzzer
87823 420187 11687 0 3 0x10008a sigsusp ksh
11687 470885 14987 0 3 0x9a poll sshd
97567 362737 1 0 3 0x100083 ttyin getty
14987 268713 1 0 3 0x88 poll sshd
63490 489227 78187 73 3 0x100090 kqread syslogd
78187 107545 1 0 3 0x100082 netio syslogd
9512 32276 1 0 3 0x100080 kqread resolvd
82870 299113 37617 77 3 0x100092 kqread dhcpleased
5115 47430 37617 77 3 0x100092 kqread dhcpleased
37617 144893 1 0 3 0x80 kqread dhcpleased
30875 180695 0 0 3 0x14200 bored smr
20137 379103 0 0 2 0x14200 zerothread
15577 159776 0 0 3 0x14200 aiodoned aiodoned
64355 289121 0 0 3 0x14200 syncer update
27835 269040 0 0 3 0x14200 cleaner cleaner
80267 404279 0 0 3 0x14200 reaper reaper
53438 474958 0 0 3 0x14200 pgdaemon pagedaemon
52740 370991 0 0 3 0x14200 bored viomb
32834 293627 0 0 3 0x40014200 acpi0 acpi0
70648 318347 0 0 3 0x40014200 idle1
19458 68024 0 0 3 0x14200 bored softnet
90875 514075 0 0 3 0x14200 bored systqmp
13833 76150 0 0 3 0x14200 bored systq
79577 99922 0 0 3 0x40014200 bored softclock
60174 106898 0 0 3 0x40014200 idle0
1 154926 0 0 3 0x82 wait init
0 0 -1 0 3 0x10200 scheduler swapper
ddb{1}> show all locks
CPU 1:
exclusive mutex fdescpl r = 0 (0xffffffff82a39ec8)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_get+0xbd sys/kern/subr_pool.c:581
#4 fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1072 [inline]
#4 fdcopy+0x44 sys/kern/kern_descrip.c:1111
#5 process_new+0x13b sys/kern/kern_fork.c:258
#6 fork1+0x30b sys/kern/kern_fork.c:382
#7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#8 Xsyscall+0x128
Process 60706 (syz-executor.5) thread 0xffff8000fffef510 (438910)
exclusive rwlock sysctllk r = 0 (0xffffffff828d66e0)
#0 witness_lock+0x44d
#1 rw_enter+0x3e1 sys/kern/kern_rwlock.c:310
#2 sys_sysctl+0x1b3 sys/kern/kern_sysctl.c:233
#3 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#3 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#4 Xsyscall+0x128
Process 24824 (syz-executor.7) thread 0xffff8000ffff4fc8 (358210)
exclusive kernel_lock &kernel_lock r = 0 (0xffffffff82abdf30)
#0 witness_lock+0x44d
#1 syscall+0x3ef mi_syscall sys/sys/syscall_mi.h:93 [inline]
#1 syscall+0x3ef sys/arch/amd64/amd64/trap.c:585
#2 Xsyscall+0x128
exclusive mutex fdescpl r = 0 (0xffffffff82a39ec8)
#0 witness_lock+0x44d
#1 mtx_enter_try+0x100
#2 mtx_enter+0x4b sys/kern/kern_lock.c:266
#3 pool_get+0xbd sys/kern/subr_pool.c:581
#4 fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1072 [inline]
#4 fdcopy+0x44 sys/kern/kern_descrip.c:1111
#5 process_new+0x13b sys/kern/kern_fork.c:258
#6 fork1+0x30b sys/kern/kern_fork.c:382
#7 syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
#7 syscall+0x489 sys/arch/amd64/amd64/trap.c:585
#8 Xsyscall+0x128
ddb{1}> show malloc
Type InUse MemUse HighUse Limit Requests Type Lim
devbuf 10193 6410K 6418K 78643K 11332 0
pcb 13 16K 18K 78643K 19 0
rtable 262 7K 7K 78643K 1668 0
ifaddr 81 17K 17K 78643K 195 0
sysctl 2 0K 0K 78643K 2 0
counters 56 35K 35K 78643K 88 0
ioctlops 0 0K 2K 78643K 128 0
iov 0 0K 32K 78643K 1325 0
mount 1 1K 1K 78643K 1 0
log 0 0K 0K 78643K 5 0
vnodes 1271 79K 79K 78643K 3278 0
UFS quota 1 32K 32K 78643K 1 0
UFS mount 5 36K 36K 78643K 5 0
shm 2 1K 9K 78643K 85 0
VM map 2 1K 1K 78643K 2 0
sem 12 0K 1K 78643K 3182 0
dirhash 12 2K 2K 78643K 12 0
ACPI 1697 195K 286K 78643K 12598 0
file desc 25 93K 113K 78643K 9582 0
sigio 0 0K 0K 78643K 379 0
proc 56 74K 111K 78643K 1454 0
subproc 104 6K 6K 78643K 312 0
NFS srvsock 1 0K 0K 78643K 1 0
NFS daemon 1 16K 16K 78643K 1 0
ip_moptions 2 0K 0K 78643K 1202 0
in_multi 99 6K 7K 78643K 478 0
ether_multi 1 0K 0K 78643K 47 0
mrt 1 0K 0K 78643K 2 0
ISOFS mount 1 32K 32K 78643K 1 0
MSDOSFS mount 1 16K 16K 78643K 1 0
ttys 205 917K 917K 78643K 205 0
exec 0 0K 2K 78643K 2469 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 414 91K 107K 78643K 124652 0
UVM aobj 131 4K 4K 78643K 134 0
memdesc 1 4K 4K 78643K 1 0
crypto data 1 1K 1K 78643K 1 0
ip6_options 0 0K 0K 78643K 309 0
NDP 11 0K 2K 78643K 75 0
temp 126 4700K 4764K 78643K 27576 0
kqueue 11 16K 24K 78643K 561 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 1652 0 1649 27 26 1 5 0 8 0
rtentry 112 315 0 193 4 0 4 4 0 8 0
unpcb 136 8128 0 8115 65 63 2 9 0 8 1
syncache 296 103 0 103 19 18 1 1 0 8 1
sackhl 24 1 0 1 1 1 0 1 0 8 0
tcpqe 32 34 0 34 14 14 0 1 0 8 0
tcpcb 736 13724 0 13708 243 233 10 25 0 8 8
arp 120 53 0 33 1 0 1 1 0 8 0
ipq 40 9 0 9 5 5 0 1 0 8 0
ipqe 40 25 0 25 5 5 0 1 0 8 0
inpcb 304 18488 0 18471 142 135 7 22 0 8 4
rttmr 72 9 0 7 1 0 1 1 0 8 0
ip6q 72 50 0 49 4 3 1 1 0 8 0
ip6af 40 89 0 89 4 4 0 1 0 8 0
nd6 48 95 0 63 1 0 1 1 0 8 0
kcovpl 48 24 0 16 1 0 1 1 0 8 0
art_heap8 4096 1 0 0 1 0 1 1 0 8 0
art_heap4 256 1344 0 792 40 5 35 37 0 8 0
art_table 32 1345 0 792 5 0 5 5 0 8 0
art_node 16 314 0 202 1 0 1 1 0 8 0
sysvmsgpl 40 64 0 35 1 0 1 1 0 8 0
semupl 112 4 0 4 1 1 0 1 0 8 0
semapl 112 3180 0 3170 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 14135 0 12695 91 0 91 91 0 8 0
ffsino 272 14135 0 12695 97 0 97 97 0 8 0
nchpl 144 26605 0 24977 63 1 62 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 92231 0 92231 5 4 1 2 0 8 1
percpumem 16 56 0 16 1 0 1 1 0 8 0
scxspl 216 72255 0 72255 36 34 2 8 0 8 2
plimitpl 152 1859 0 1837 8 7 1 2 0 8 0
sigapl 424 9825 0 9774 7 1 6 7 0 8 0
futexpl 64 86765 0 86761 4 3 1 1 0 8 0
knotepl 112 223 0 0 6 1 5 5 0 8 0
kqueuepl 216 3394 0 3387 50 49 1 5 0 8 0
pipepl 336 1708 0 1680 28 25 3 8 0 8 0
fdescpl 496 9810 0 9774 6 1 5 6 0 8 0
pool(0xffffffff82a39eb8:fdescpl): page inconsistency: page 0xfffffd8067397000; 1 on list, 6 missing, 8 items per page
filepl 152 72700 0 72465 117 104 13 24 0 8 3
lockfpl 104 1641 0 1639 2 1 1 2 0 8 0
lockfspl 48 377 0 375 1 0 1 1 0 8 0
sessionpl 144 39 0 23 1 0 1 1 0 8 0
pgrppl 48 233 0 217 1 0 1 1 0 8 0
ucredpl 96 11524 0 11506 1 0 1 1 0 8 0
zombiepl 144 9774 0 9774 1 0 1 1 0 8 1
processpl 1064 9826 0 9774 4 0 4 4 0 8 0
procpl 672 28712 0 28646 17 10 7 8 0 8 0
srpgc 96 1 0 1 1 1 0 1 0 8 0
sosppl 168 137 0 137 18 17 1 1 0 8 1
sockpl 480 28750 0 28723 567 555 12 38 0 8 8
mcl64k 65536 33 0 0 3 0 3 3 0 8 0
mcl16k 16384 25 0 0 3 0 3 3 0 8 0
mcl12k 12288 25 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 1 2 3 0 8 0
mcl4k 4096 25 0 0 3 0 3 3 0 8 0
mcl2k2 2112 6 0 0 1 0 1 1 0 8 0
mcl2k 2048 233 0 0 17 2 15 17 0 8 0
mtagpl 96 2 0 0 1 0 1 1 0 8 0
mbufpl 256 4647 0 0 266 0 266 266 0 8 0
bufpl 288 17028 0 10693 453 0 453 453 0 8 0
anonpl 24 2864609 0 2849652 213 101 112 120 0 186 0
amapchunkpl 152 325692 0 324876 115 80 35 48 0 158 1
amappl16 200 32884 0 32446 197 172 25 37 0 8 1
amappl15 192 154 0 149 1 0 1 1 0 8 0
amappl14 184 10 0 5 1 0 1 1 0 8 0
amappl13 176 1951 0 1946 1 0 1 1 0 8 0
amappl12 168 2544 0 2534 1 0 1 1 0 8 0
amappl11 160 1086 0 1073 1 0 1 1 0 8 0
amappl10 152 2452 0 2446 1 0 1 1 0 8 0
amappl9 144 846 0 837 1 0 1 1 0 8 0
amappl8 136 2443 0 2305 5 0 5 5 0 8 0
amappl7 128 1338 0 1326 1 0 1 1 0 8 0
amappl6 120 623 0 593 2 1 1 2 0 8 0
amappl5 112 10353 0 10329 1 0 1 1 0 8 0
amappl4 104 2446 0 2412 2 1 1 2 0 8 0
amappl3 96 4148 0 4130 1 0 1 1 0 8 0
amappl2 88 4200 0 4151 3 1 2 3 0 8 0
amappl1 80 178272 0 177637 21 6 15 18 0 8 0
amappl 88 123513 0 123235 9 2 7 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 9810 0 9774 1 0 1 1 0 8 0
uaddrbest 32 2 0 0 1 0 1 1 0 8 0
uaddr 24 9810 0 9774 1 0 1 1 0 8 0
vmmpekpl 168 79199 0 79150 3 0 3 3 0 8 0
vmmpepl 168 912614 0 909769 220 88 132 139 0 357 1
vmsppl 368 9809 0 9774 4 0 4 4 0 8 0
rwobjpl 56 230152 0 222635 124 15 109 111 0 8 0
pdppl 4096 19627 0 19548 315 234 81 91 0 8 2
pvpl 32 4658019 0 4637629 402 216 186 261 0 265 0
pmappl 248 9809 0 9774 3 0 3 3 0 8 0
extentpl 40 57 0 38 1 0 1 1 0 8 0
phpool 112 1578 0 506 31 0 31 31 0 8 0
ddb{1}> machine ddbcpu 0
Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp
x86_ipi_db(ffffffff82907ff0) 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
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xc sys/dev/kcov.c:144
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
__mp_lock(ffffffff82abdd28) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82abdd28) at __mp_lock+0x122 sys/kern/kern_lock.c:147
kqueue_scan(ffff80002119cb20,8,ffff80002119ca20,ffff80002119cc10,ffff8000ffff6d30,ffff80002119cc6c) at kqueue_scan+0xd8 sys/kern/kern_event.c:1290
sys_kevent(ffff8000ffff6d30,ffff80002119ccd0,ffff80002119cd30) at sys_kevent+0x47b sys/kern/kern_event.c:982
syscall(ffff80002119cda0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002119cda0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcef60, count: 4
ddb{0}> trace
x86_ipi_db(ffffffff82907ff0) 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
__sanitizer_cov_trace_pc() at __sanitizer_cov_trace_pc+0xc sys/dev/kcov.c:144
softintr_dispatch(0) at softintr_dispatch+0x4e sys/arch/amd64/amd64/softintr.c:88
Xsoftclock() at Xsoftclock+0x1f
__mp_lock(ffffffff82abdd28) at __mp_lock+0x122 __mp_lock_spin sys/kern/kern_lock.c:116 [inline]
__mp_lock(ffffffff82abdd28) at __mp_lock+0x122 sys/kern/kern_lock.c:147
kqueue_scan(ffff80002119cb20,8,ffff80002119ca20,ffff80002119cc10,ffff8000ffff6d30,ffff80002119cc6c) at kqueue_scan+0xd8 sys/kern/kern_event.c:1290
sys_kevent(ffff8000ffff6d30,ffff80002119ccd0,ffff80002119cd30) at sys_kevent+0x47b sys/kern/kern_event.c:982
syscall(ffff80002119cda0) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002119cda0) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffcef60, count: -11
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(ffffffff825d022a) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82a39eb8,9,ffff80002a53e1e8) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82a39eb8,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
fdcopy(ffff80002116c010) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1072 [inline]
fdcopy(ffff80002116c010) at fdcopy+0x44 sys/kern/kern_descrip.c:1111
process_new(ffff800027aff268,ffff80002116c010,1) at process_new+0x13b sys/kern/kern_fork.c:258
fork1(ffff8000ffff4fc8,1,ffffffff81975570,0,ffff80002a53e420,0) at fork1+0x30b sys/kern/kern_fork.c:382
syscall(ffff80002a53e490) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002a53e490) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe38b0, count: 6
ddb{1}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:440
panic(ffffffff825d022a) at panic+0x177 sys/kern/subr_prf.c:202
pool_do_get(ffffffff82a39eb8,9,ffff80002a53e1e8) at pool_do_get+0x474 sys/kern/subr_pool.c:741
pool_get(ffffffff82a39eb8,9) at pool_get+0xe9 sys/kern/subr_pool.c:584
fdcopy(ffff80002116c010) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1072 [inline]
fdcopy(ffff80002116c010) at fdcopy+0x44 sys/kern/kern_descrip.c:1111
process_new(ffff800027aff268,ffff80002116c010,1) at process_new+0x13b sys/kern/kern_fork.c:258
fork1(ffff8000ffff4fc8,1,ffffffff81975570,0,ffff80002a53e420,0) at fork1+0x30b sys/kern/kern_fork.c:382
syscall(ffff80002a53e490) at syscall+0x489 mi_syscall sys/sys/syscall_mi.h:102 [inline]
syscall(ffff80002a53e490) at syscall+0x489 sys/arch/amd64/amd64/trap.c:585
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x7f7ffffe38b0, count: -9