Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2024-input.r400-tall-171690531600102.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2024-input.qcow2 backing_fmt=qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.............................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5568
Executing tool itstools
Input is StigmergyCommit-PT-02b, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r400-tall-171690531600102
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 584K
-rw-r--r-- 1 mcc users 7.0K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 76K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 47K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.4K Apr 23 07:58 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Apr 23 07:58 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Apr 23 07:58 LTLFireability.txt
-rw-r--r-- 1 mcc users 15K Apr 23 07:58 LTLFireability.xml
-rw-r--r-- 1 mcc users 7.4K Apr 11 17:42 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 70K Apr 11 17:42 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 6.7K Apr 11 17:41 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 53K Apr 11 17:41 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Apr 23 07:58 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 23 07:58 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 4 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 231K May 18 16:43 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 StigmergyCommit-PT-02b-ReachabilityCardinality-2024-00
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-01
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-02
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-03
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-04
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-05
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-06
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-07
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-08
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-09
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-10
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-11
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-12
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-13
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-14
FORMULA_NAME StigmergyCommit-PT-02b-ReachabilityCardinality-2024-15

=== Now, execution of the tool begins

BK_START 1716984368143

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=StigmergyCommit-PT-02b
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
ReachabilityCardinality PT
Running Version 202405141337
[2024-05-29 12:06:09] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2024-05-29 12:06:09] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-29 12:06:09] [INFO ] Load time of PNML (sax parser for PT used): 106 ms
[2024-05-29 12:06:09] [INFO ] Transformed 928 places.
[2024-05-29 12:06:09] [INFO ] Transformed 1040 transitions.
[2024-05-29 12:06:09] [INFO ] Found NUPN structural information;
[2024-05-29 12:06:09] [INFO ] Parsed PT model containing 928 places and 1040 transitions and 2439 arcs in 210 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 16 ms.
Working with output stream class java.io.PrintStream
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2024-05-29 12:06:10] [INFO ] Flatten gal took : 207 ms
RANDOM walk for 40000 steps (665 resets) in 1984 ms. (20 steps per ms) remains 9/15 properties
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-10 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
BEST_FIRST walk for 40003 steps (160 resets) in 154 ms. (258 steps per ms) remains 9/9 properties
[2024-05-29 12:06:10] [INFO ] Flatten gal took : 117 ms
BEST_FIRST walk for 40004 steps (165 resets) in 254 ms. (156 steps per ms) remains 9/9 properties
[2024-05-29 12:06:10] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality2801374938907812894.gal : 50 ms
BEST_FIRST walk for 40004 steps (162 resets) in 137 ms. (289 steps per ms) remains 9/9 properties
[2024-05-29 12:06:10] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality6796123278283928815.prop : 2 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality2801374938907812894.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality6796123278283928815.prop' '--nowitness' '--gen-order' 'FOLLOW'
BEST_FIRST walk for 40003 steps (163 resets) in 121 ms. (327 steps per ms) remains 9/9 properties

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...328
BEST_FIRST walk for 40003 steps (154 resets) in 198 ms. (201 steps per ms) remains 8/9 properties
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-03 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Loading property file /tmp/ReachabilityCardinality6796123278283928815.prop.
SDD proceeding with computation,9 properties remain. new max is 4
SDD size :1 after 2
SDD proceeding with computation,9 properties remain. new max is 8
SDD size :2 after 7
SDD proceeding with computation,9 properties remain. new max is 16
SDD size :7 after 10
SDD proceeding with computation,9 properties remain. new max is 32
SDD size :10 after 13
SDD proceeding with computation,9 properties remain. new max is 64
SDD size :13 after 16
SDD proceeding with computation,9 properties remain. new max is 128
SDD size :16 after 39
SDD proceeding with computation,9 properties remain. new max is 256
SDD size :39 after 43
SDD proceeding with computation,9 properties remain. new max is 512
SDD size :43 after 80
Reachability property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-13 is true.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-13 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,8 properties remain. new max is 512
SDD size :80 after 2370
SDD proceeding with computation,8 properties remain. new max is 1024
SDD size :2370 after 5983
SDD proceeding with computation,8 properties remain. new max is 2048
SDD size :5983 after 38835
SDD proceeding with computation,8 properties remain. new max is 4096
SDD size :38835 after 56413
SDD proceeding with computation,8 properties remain. new max is 8192
SDD size :56413 after 946299
Invariant property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-09 does not hold.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-09 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Reachability property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-07 is true.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-07 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Invariant property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-05 does not hold.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-05 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Reachability property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-04 is true.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-04 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,4 properties remain. new max is 8192
SDD size :946299 after 3.89619e+06
Reachability property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-11 is true.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-11 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,3 properties remain. new max is 8192
SDD size :3.89619e+06 after 5.69518e+06
SDD proceeding with computation,3 properties remain. new max is 16384
SDD size :5.69518e+06 after 1.20715e+07
Invariant property StigmergyCommit-PT-02b-ReachabilityCardinality-2024-06 does not hold.
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-06 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
BEST_FIRST walk for 37784 steps (150 resets) in 60155 ms. (0 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (167 resets) in 247 ms. (161 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (164 resets) in 220 ms. (181 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40003 steps (185 resets) in 90 ms. (439 steps per ms) remains 7/8 properties
// Phase 1: matrix 1040 rows 928 cols
[2024-05-29 12:07:10] [INFO ] Computed 4 invariants in 49 ms
At refinement iteration 0 (INCLUDED_ONLY) 0/2 variables, 2/2 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/2 variables, 0/2 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 2 (OVERLAPS) 303/305 variables, 1/3 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/305 variables, 303/306 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/305 variables, 0/306 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 5 (OVERLAPS) 623/928 variables, 3/309 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/928 variables, 623/932 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/928 variables, 0/932 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 8 (OVERLAPS) 1040/1968 variables, 928/1860 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/1968 variables, 0/1860 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 10 (OVERLAPS) 0/1968 variables, 0/1860 constraints. Problems are: Problem set: 0 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Real declared 1968/1968 variables, and 1860 constraints, problems are : Problem set: 0 solved, 1 unsolved in 1293 ms.
Refiners :[Domain max(s): 928/928 constraints, Positive P Invariants (semi-flows): 4/4 constraints, State Equation: 928/928 constraints, PredecessorRefiner: 1/1 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 1 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/2 variables, 2/2 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/2 variables, 0/2 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 2 (OVERLAPS) 303/305 variables, 1/3 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/305 variables, 303/306 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/305 variables, 0/306 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 5 (OVERLAPS) 623/928 variables, 3/309 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/928 variables, 623/932 constraints. Problems are: Problem set: 0 solved, 1 unsolved
[2024-05-29 12:07:12] [INFO ] Deduced a trap composed of 396 places in 331 ms of which 47 ms to minimize.
[2024-05-29 12:07:13] [INFO ] Deduced a trap composed of 397 places in 284 ms of which 7 ms to minimize.
[2024-05-29 12:07:13] [INFO ] Deduced a trap composed of 482 places in 285 ms of which 7 ms to minimize.
At refinement iteration 7 (INCLUDED_ONLY) 0/928 variables, 3/935 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/928 variables, 0/935 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 9 (OVERLAPS) 1040/1968 variables, 928/1863 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/1968 variables, 1/1864 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/1968 variables, 0/1864 constraints. Problems are: Problem set: 0 solved, 1 unsolved
At refinement iteration 12 (OVERLAPS) 0/1968 variables, 0/1864 constraints. Problems are: Problem set: 0 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Int declared 1968/1968 variables, and 1864 constraints, problems are : Problem set: 0 solved, 1 unsolved in 1584 ms.
Refiners :[Domain max(s): 928/928 constraints, Positive P Invariants (semi-flows): 4/4 constraints, State Equation: 928/928 constraints, PredecessorRefiner: 1/1 constraints, Known Traps: 3/3 constraints]
After SMT, in 3014ms problems are : Problem set: 0 solved, 1 unsolved
Finished Parikh walk after 92 steps, including 0 resets, run visited all 1 properties in 1 ms. (steps per millisecond=92 )
FORMULA StigmergyCommit-PT-02b-ReachabilityCardinality-2024-01 TRUE TECHNIQUES PARIKH_WALK
Parikh walk visited 1 properties in 8 ms.
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
All properties solved without resorting to model-checking.
Total runtime 64567 ms.

BK_STOP 1716984433954

--------------------
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
+ [[ ReachabilityCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityCardinality -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_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -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="StigmergyCommit-PT-02b"
export BK_EXAMINATION="ReachabilityCardinality"
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 2-5568"
echo " Executing tool itstools"
echo " Input is StigmergyCommit-PT-02b, examination is ReachabilityCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r400-tall-171690531600102"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/StigmergyCommit-PT-02b.tgz
mv StigmergyCommit-PT-02b execution
cd execution
if [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "UpperBounds" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] || [ "ReachabilityCardinality" = "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 [ "ReachabilityCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityCardinality" != "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 "ReachabilityCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityCardinality.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 '' ReachabilityCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityCardinality"
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 ;