ERROR: could not lock RRD

/opt/smokeping/cache/APAC/AS7552-1_last_864000.png
--start
-864000
--height
200
--width
800
--title
Last 10 Days
--rigid
--upper-limit
0.31379256
--lower-limit
0
--vertical-label
Seconds
--imgformat
PNG
--color
SHADEA#ffffff
--color
SHADEB#ffffff
--color
BACK#ffffff
--color
CANVAS#ffffff
DEF:ping1=/opt/smokeping/data/APAC/AS7552-1.rrd:ping1:AVERAGE
DEF:ping2=/opt/smokeping/data/APAC/AS7552-1.rrd:ping2:AVERAGE
DEF:ping3=/opt/smokeping/data/APAC/AS7552-1.rrd:ping3:AVERAGE
DEF:ping4=/opt/smokeping/data/APAC/AS7552-1.rrd:ping4:AVERAGE
DEF:ping5=/opt/smokeping/data/APAC/AS7552-1.rrd:ping5:AVERAGE
DEF:ping6=/opt/smokeping/data/APAC/AS7552-1.rrd:ping6:AVERAGE
DEF:ping7=/opt/smokeping/data/APAC/AS7552-1.rrd:ping7:AVERAGE
DEF:ping8=/opt/smokeping/data/APAC/AS7552-1.rrd:ping8:AVERAGE
DEF:ping9=/opt/smokeping/data/APAC/AS7552-1.rrd:ping9:AVERAGE
DEF:ping10=/opt/smokeping/data/APAC/AS7552-1.rrd:ping10:AVERAGE
CDEF:cp1=ping1,0.31379256,LT,ping1,INF,IF
CDEF:cp2=ping2,0.31379256,LT,ping2,INF,IF
CDEF:cp3=ping3,0.31379256,LT,ping3,INF,IF
CDEF:cp4=ping4,0.31379256,LT,ping4,INF,IF
CDEF:cp5=ping5,0.31379256,LT,ping5,INF,IF
CDEF:cp6=ping6,0.31379256,LT,ping6,INF,IF
CDEF:cp7=ping7,0.31379256,LT,ping7,INF,IF
CDEF:cp8=ping8,0.31379256,LT,ping8,INF,IF
CDEF:cp9=ping9,0.31379256,LT,ping9,INF,IF
CDEF:cp10=ping10,0.31379256,LT,ping10,INF,IF
DEF:loss=/opt/smokeping/data/APAC/AS7552-1.rrd:loss:AVERAGE
CDEF:smoke1=cp1,UN,UNKN,cp10,cp1,-,IF
AREA:cp1
STACK:smoke1#cacaca
CDEF:smoke2=cp2,UN,UNKN,cp9,cp2,-,IF
AREA:cp2
STACK:smoke2#a4a4a4
CDEF:smoke3=cp3,UN,UNKN,cp8,cp3,-,IF
AREA:cp3
STACK:smoke3#7e7e7e
CDEF:smoke4=cp4,UN,UNKN,cp7,cp4,-,IF
AREA:cp4
STACK:smoke4#585858
CDEF:smoke5=cp5,UN,UNKN,cp6,cp5,-,IF
AREA:cp5
STACK:smoke5#323232
DEF:median=/opt/smokeping/data/APAC/AS7552-1.rrd:median:AVERAGE
CDEF:ploss=loss,10,/,100,*
VDEF:avmed=median,AVERAGE
CDEF:mesd=median,POP,avmed,0.00124362554155259,/
GPRINT:avmed:median rtt\: %.1lf %ss avg
GPRINT:median:MAX:%.1lf %ss max
GPRINT:median:MIN:%.1lf %ss min
GPRINT:median:LAST:%.1lf %ss now
COMMENT:1.2 ms sd
GPRINT:mesd:AVERAGE:%.1lf %s am/s\l
LINE1:median#202020
GPRINT:ploss:AVERAGE:packet loss\: %.2lf %% avg
GPRINT:ploss:MAX:%.2lf %% max
GPRINT:ploss:MIN:%.2lf %% min
GPRINT:ploss:LAST:%.2lf %% now\l
COMMENT:loss color\:
CDEF:me0=loss,-1,GT,loss,0,LE,*,1,UNKN,IF,median,*
CDEF:meL0=me0,0.0015689628,-
CDEF:meH0=me0,0,*,0.0015689628,2,*,+
AREA:meL0
STACK:meH0#26ff00:0
CDEF:me1=loss,0,GT,loss,1,LE,*,1,UNKN,IF,median,*
CDEF:meL1=me1,0.0015689628,-
CDEF:meH1=me1,0,*,0.0015689628,2,*,+
AREA:meL1
STACK:meH1#00b8ff:1/10
CDEF:me2=loss,1,GT,loss,2,LE,*,1,UNKN,IF,median,*
CDEF:meL2=me2,0.0015689628,-
CDEF:meH2=me2,0,*,0.0015689628,2,*,+
AREA:meL2
STACK:meH2#0059ff:2/10
CDEF:me3=loss,2,GT,loss,3,LE,*,1,UNKN,IF,median,*
CDEF:meL3=me3,0.0015689628,-
CDEF:meH3=me3,0,*,0.0015689628,2,*,+
AREA:meL3
STACK:meH3#5e00ff:3/10
CDEF:me4=loss,3,GT,loss,4,LE,*,1,UNKN,IF,median,*
CDEF:meL4=me4,0.0015689628,-
CDEF:meH4=me4,0,*,0.0015689628,2,*,+
AREA:meL4
STACK:meH4#7e00ff:4/10
CDEF:me5=loss,4,GT,loss,5,LE,*,1,UNKN,IF,median,*
CDEF:meL5=me5,0.0015689628,-
CDEF:meH5=me5,0,*,0.0015689628,2,*,+
AREA:meL5
STACK:meH5#dd00ff:5/10
CDEF:me9=loss,5,GT,loss,9,LE,*,1,UNKN,IF,median,*
CDEF:meL9=me9,0.0015689628,-
CDEF:meH9=me9,0,*,0.0015689628,2,*,+
AREA:meL9
STACK:meH9#ff0000:9/10
COMMENT: \l
HRULE:0#000000
COMMENT:probe\: 10 ICMP Echo Pings (56 Bytes) every 80s
COMMENT:end\: Wed Jul 9 07\:35\:52 2025\j