Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2023-input.r005-oct2-167813592900247.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 backing_fmt=qcow2 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
..................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5348
Executing tool itstools
Input is AirplaneLD-PT-0010, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r005-oct2-167813592900247
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 568K
-rw-r--r-- 1 mcc users 12K Feb 26 11:11 CTLCardinality.txt
-rw-r--r-- 1 mcc users 85K Feb 26 11:11 CTLCardinality.xml
-rw-r--r-- 1 mcc users 9.0K Feb 26 11:09 CTLFireability.txt
-rw-r--r-- 1 mcc users 68K Feb 26 11:09 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.5K Jan 29 11:40 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 6.2K Feb 25 15:30 LTLCardinality.txt
-rw-r--r-- 1 mcc users 31K Feb 25 15:30 LTLCardinality.xml
-rw-r--r-- 1 mcc users 4.3K Feb 25 15:30 LTLFireability.txt
-rw-r--r-- 1 mcc users 26K Feb 25 15:30 LTLFireability.xml
-rw-r--r-- 1 mcc users 17K Feb 26 11:14 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 99K Feb 26 11:14 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 13K Feb 26 11:13 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 89K Feb 26 11:13 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K Feb 25 15:30 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Feb 25 15:30 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 48K Mar 5 18:22 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-00
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-01
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-02
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-03
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-04
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-05
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-06
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-07
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-08
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-09
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-10
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-11
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-12
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-13
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-14
FORMULA_NAME AirplaneLD-PT-0010-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1678508205063

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=AirplaneLD-PT-0010
Not applying reductions.
Model is PT
ReachabilityFireability PT
Running Version 202303021504
[2023-03-11 04:16:48] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2023-03-11 04:16:48] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-11 04:16:48] [INFO ] Load time of PNML (sax parser for PT used): 38 ms
[2023-03-11 04:16:48] [INFO ] Transformed 89 places.
[2023-03-11 04:16:48] [INFO ] Transformed 88 transitions.
[2023-03-11 04:16:48] [INFO ] Parsed PT model containing 89 places and 88 transitions and 333 arcs in 188 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 14 ms.
Working with output stream class java.io.PrintStream
Reduce places removed 32 places and 0 transitions.
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-00 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 1256 resets, run finished after 531 ms. (steps per millisecond=18 ) properties (out of 15) seen :9
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-11 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
[2023-03-11 04:16:48] [INFO ] Flatten gal took : 53 ms
[2023-03-11 04:16:48] [INFO ] Flatten gal took : 27 ms
Incomplete Best-First random walk after 10000 steps, including 97 resets, run finished after 140 ms. (steps per millisecond=71 ) properties (out of 6) seen :0
Incomplete Best-First random walk after 10001 steps, including 76 resets, run finished after 140 ms. (steps per millisecond=71 ) properties (out of 6) seen :1
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-04 FALSE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Incomplete Best-First random walk after 10001 steps, including 72 resets, run finished after 34 ms. (steps per millisecond=294 ) properties (out of 5) seen :0
[2023-03-11 04:16:49] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality11710285526872928095.gal : 33 ms
[2023-03-11 04:16:49] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality6202154054798327801.prop : 1 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality11710285526872928095.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality6202154054798327801.prop' '--nowitness' '--gen-order' 'FOLLOW'
Incomplete Best-First random walk after 10001 steps, including 98 resets, run finished after 59 ms. (steps per millisecond=169 ) properties (out of 5) seen :0

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...329
Loading property file /tmp/ReachabilityCardinality6202154054798327801.prop.
SDD proceeding with computation,6 properties remain. new max is 4
SDD size :1 after 5
SDD proceeding with computation,6 properties remain. new max is 8
SDD size :5 after 42
SDD proceeding with computation,6 properties remain. new max is 16
SDD size :42 after 120
SDD proceeding with computation,6 properties remain. new max is 32
SDD size :120 after 1617
Invariant property AirplaneLD-PT-0010-ReachabilityFireability-09 does not hold.
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-09 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Invariant property AirplaneLD-PT-0010-ReachabilityFireability-04 does not hold.
Incomplete Best-First random walk after 10001 steps, including 67 resets, run finished after 57 ms. (steps per millisecond=175 ) properties (out of 5) seen :0
SDD proceeding with computation,4 properties remain. new max is 32
SDD size :38115 after 40922
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
petri\_inst\_inst,43463,0.056553,4188,2,291,13,2843,10,0,360,1217,0
Total reachable state count : 43463

Verifying 6 reachability properties.
Reachability property AirplaneLD-PT-0010-ReachabilityFireability-03 does not hold.
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-03 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : AirplaneLD-PT-0010-ReachabilityFireability-03

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
AirplaneLD-PT-0010-ReachabilityFireability-03,0,0.059574,4500,1,0,13,2843,10,0,384,1217,0
Invariant property AirplaneLD-PT-0010-ReachabilityFireability-04 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
AirplaneLD-PT-0010-ReachabilityFireability-04,231,0.063221,4500,2,168,13,2843,11,0,449,1217,0
Invariant property AirplaneLD-PT-0010-ReachabilityFireability-09 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
AirplaneLD-PT-0010-ReachabilityFireability-09,11,0.064069,4500,2,80,13,2843,12,0,459,1217,0
Reachability property AirplaneLD-PT-0010-ReachabilityFireability-12 does not hold.
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-12 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : AirplaneLD-PT-0010-ReachabilityFireability-12

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
AirplaneLD-PT-0010-ReachabilityFireability-12,0,0.064402,4500,1,0,13,2843,12,0,461,1217,0
Invariant property AirplaneLD-PT-0010-ReachabilityFireability-13 is true.
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-13 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
AirplaneLD-PT-0010-ReachabilityFireability-13,0,0.065233,4500,1,0,13,2843,12,0,467,1217,0
Reachability property AirplaneLD-PT-0010-ReachabilityFireability-14 does not hold.
FORMULA AirplaneLD-PT-0010-ReachabilityFireability-14 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : AirplaneLD-PT-0010-ReachabilityFireability-14

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
AirplaneLD-PT-0010-ReachabilityFireability-14,0,0.066529,4500,1,0,13,2843,12,0,476,1217,0
Incomplete Best-First random walk after 10001 steps, including 73 resets, run finished after 30 ms. (steps per millisecond=333 ) properties (out of 5) seen :0
Running SMT prover for 5 properties.
// Phase 1: matrix 88 rows 57 cols
[2023-03-11 04:16:49] [INFO ] Computed 3 place invariants in 5 ms
[2023-03-11 04:16:49] [INFO ] [Real]Absence check using 2 positive place invariants in 2 ms returned sat
[2023-03-11 04:16:49] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 0 ms returned sat
[2023-03-11 04:16:49] [INFO ] After 194ms SMT Verify possible using all constraints in real domain returned unsat :2 sat :0 real:3
[2023-03-11 04:16:49] [INFO ] [Nat]Absence check using 2 positive place invariants in 1 ms returned sat
[2023-03-11 04:16:49] [INFO ] [Nat]Absence check using 2 positive and 1 generalized place invariants in 1 ms returned sat
[2023-03-11 04:16:49] [INFO ] After 166ms SMT Verify possible using state equation in natural domain returned unsat :4 sat :1
[2023-03-11 04:16:49] [INFO ] After 192ms SMT Verify possible using trap constraints in natural domain returned unsat :4 sat :1
Attempting to minimize the solution found.
Minimization took 16 ms.
[2023-03-11 04:16:49] [INFO ] After 344ms SMT Verify possible using all constraints in natural domain returned unsat :4 sat :1
Fused 5 Parikh solutions to 1 different solutions.
Finished Parikh walk after 5 steps, including 0 resets, run visited all 1 properties in 2 ms. (steps per millisecond=2 )
Application raised an uncaught exception Index 0 out of bounds for length 0
java.lang.IndexOutOfBoundsException: Index 0 out of bounds for length 0
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:266)
at java.base/java.util.Objects.checkIndex(Objects.java:359)
at java.base/java.util.ArrayList.get(ArrayList.java:427)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.interpretWalkerVerdict(ReachabilitySolver.java:410)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.interpretWalkerVerdict(ReachabilitySolver.java:402)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.applyReductions(ReachabilitySolver.java:170)
at fr.lip6.move.gal.application.Application.startNoEx(Application.java:902)
at fr.lip6.move.gal.application.Application.start(Application.java:178)
at fr.lip6.move.gal.itscl.application.Application.start(Application.java:45)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
at org.eclipse.equinox.launcher.Main.main(Main.java:1440)
Total runtime 1997 ms.

BK_STOP 1678508210227

--------------------
content from stderr:

+ export BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ ReachabilityFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600

Sequence of Actions to be Executed by the VM

This is useful if one wants to reexecute the tool in the VM from the submitted image disk.

set -x
# this is for BenchKit: configuration of major elements for the test
export BK_INPUT="AirplaneLD-PT-0010"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"

# this is specific to your benchmark or test

export BIN_DIR="$HOME/BenchKit/bin"

# remove the execution directoty if it exists (to avoid increse of .vmdk images)
if [ -d execution ] ; then
rm -rf execution
fi

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-5348"
echo " Executing tool itstools"
echo " Input is AirplaneLD-PT-0010, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r005-oct2-167813592900247"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/AirplaneLD-PT-0010.tgz
mv AirplaneLD-PT-0010 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "StateSpace" ]; then
rm -f GenericPropertiesVerdict.xml
fi
pwd
ls -lh

echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "StateSpace" ] ; then
echo "The expected result is a vector of booleans"
echo BOOL_VECTOR
else
echo "no data necessary for post analysis"
fi
echo
if [ -f "ReachabilityFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityFireability.xml" ] ; then # for cunf (txt files deleted;-)
echo echo "here is the order used to build the result vector(from xml file)"
for x in $(grep '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
fi
echo
echo "=== Now, execution of the tool begins"
echo
echo -n "BK_START "
date -u +%s%3N
echo
timeout -s 9 $BK_TIME_CONFINEMENT bash -c "/home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n \"BK_STOP \" ; date -u +%s%3N"
if [ $? -eq 137 ] ; then
echo
echo "BK_TIME_CONFINEMENT_REACHED"
fi
echo
echo "--------------------"
echo "content from stderr:"
echo
cat STDERR ;