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.r318-tall-167873969300291.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
..............................................................................................................................................
=====================================================================
Generated by BenchKit 2-5348
Executing tool gold2022
Input is PolyORBLF-COL-S02J06T10, examination is LTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r318-tall-167873969300291
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 588K
-rw-r--r-- 1 mcc users 7.0K Feb 26 13:36 CTLCardinality.txt
-rw-r--r-- 1 mcc users 61K Feb 26 13:36 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.1K Feb 26 13:34 CTLFireability.txt
-rw-r--r-- 1 mcc users 52K Feb 26 13:34 CTLFireability.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 equiv_pt
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.3K Jan 29 11:40 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 10 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 4.2K Feb 25 16:34 LTLCardinality.txt
-rw-r--r-- 1 mcc users 27K Feb 25 16:34 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K Feb 25 16:34 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:34 LTLFireability.xml
-rw-r--r-- 1 mcc users 154K Mar 5 18:23 model.pnml
-rw-r--r-- 1 mcc users 13K Feb 26 13:41 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 108K Feb 26 13:41 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.7K Feb 26 13:40 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 66K Feb 26 13:40 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K Feb 25 16:34 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Feb 25 16:34 UpperBounds.xml

--------------------
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 PolyORBLF-COL-S02J06T10-LTLCardinality-00
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-01
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-02
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-03
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-04
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-05
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-06
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-07
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-08
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-09
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-10
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-11
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-12
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-13
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-14
FORMULA_NAME PolyORBLF-COL-S02J06T10-LTLCardinality-15

=== Now, execution of the tool begins

BK_START 1678953020398

gold2022
Got BK_BIN_PATH=/home/mcc/BenchKit/bin/
---> gold2022 --- TAPAAL v5
Setting MODEL_PATH=.
Setting VERIFYPN=/home/mcc/BenchKit/bin/verifypn
Got BK_TIME_CONFINEMENT=3600
Setting TEMPDIR=/home/mcc/BenchKit/bin/tmp
Got BK_MEMORY_CONFINEMENT=16384
Limiting to 16265216 kB
Total timeout: 3590
Time left: 3590

*************************************
* TAPAAL verifying LTLCardinality *
*************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd
MF=/home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy
Time left: 3590
---------------------------------------------------
Step -1: Stripping Colors
---------------------------------------------------
Verifying stripped models (16 in total)
/home/mcc/BenchKit/bin/verifypn -n -c -q 718 -ltl -l 29 -d 299 -z 4 -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./LTLCardinality.xml
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-15
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-14
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-13
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-12
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-11
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-10
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-09
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-08
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-07
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-06
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-05
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-04
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-03
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-02
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-01
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping PolyORBLF-COL-S02J06T10-LTLCardinality-00
WARNING: Could not run CPN over-approximation on any queries, terminating.
Time left: 3590
---------------------------------------------------
Step 0: Parallel Simplification
---------------------------------------------------
Doing parallel simplification (16 in total)
Total simplification timout is 718 -- reduction timeout is 299
timeout 1017 /home/mcc/BenchKit/bin/verifypn -n -ltl -q 718 -l 29 -d 299 -z 4 -s OverApprox --binary-query-io 2 --write-simplified /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./LTLCardinality.xml
FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-03 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 3 was solved

Query is satisfied.

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-04 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 4 was solved

Query is satisfied.

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-12 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 12 was solved

Query is NOT satisfied.

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-13 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 13 was solved

Query is satisfied.

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-14 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 14 was solved

Query is satisfied.
Solution found by parallel simplification (step 0)
Solution found by parallel simplification (step 0)
Solution found by parallel simplification (step 0)
Solution found by parallel simplification (step 0)
Solution found by parallel simplification (step 0)
Time left: 3434

---------------------------------------------------
Step 1: Parallel processing
---------------------------------------------------
Doing parallel verification of individual queries (11 in total)
Each query is verified by 4 parallel strategies for 299 seconds
------------------- QUERY 1 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is satisfied.
Spent 0.02232 on verification
@@@0.07,25452@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ ndfs\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 1 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-02 TRUE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 3434
------------------- QUERY 2 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is satisfied.
Spent 0.045212 on verification
@@@0.08,153040@@@
FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-06 TRUE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1

Query index 0 was solved
Query is satisfied.
Spent 0.008781 on verification
@@@0.05,25476@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ tarjan\ --ltl-heur\ dist\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 2 -n
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ ndfs\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 2 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-06 TRUE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 3433
------------------- QUERY 3 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is satisfied.
Spent 0.045935 on verification
@@@0.08,153244@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ tarjan\ --ltl-heur\ dist\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 3 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-05 TRUE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 3433
------------------- QUERY 4 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.007679 on verification
@@@0.04,25476@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ ndfs\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 4 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-15 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 3433
------------------- QUERY 5 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.368524 on verification
@@@0.43,153688@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ tarjan\ --ltl-heur\ aut\ -s\ DFS\ -p\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 5 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-09 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP OPTIM-1
Time left: 3432
------------------- QUERY 6 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.05969 on verification
@@@0.10,153184@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ tarjan\ --ltl-heur\ dist\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 6 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-01 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 3432
------------------- QUERY 7 ----------------------
No solution found



Time left: 3131
------------------- QUERY 8 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.009012 on verification
@@@0.05,25436@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ ndfs\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 8 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-11 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 3131
------------------- QUERY 9 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.008866 on verification
@@@0.05,25604@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ ndfs\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 9 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-08 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 3130
------------------- QUERY 10 ----------------------
No solution found



Time left: 2829
------------------- QUERY 11 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.134067 on verification
@@@0.17,153196@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ tarjan\ --ltl-heur\ dist\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.Ee8wySIRYy /home/mcc/BenchKit/bin/tmp/tmp.FaCnINDNbd --binary-query-io 1 -x 11 -n

FORMULA PolyORBLF-COL-S02J06T10-LTLCardinality-10 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 2828
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 2 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 512 seconds)
Time left: 2828
------------------- QUERY 7 ----------------------
Running query 7 for 1414 seconds. Remaining: 2 queries and 2828 seconds
No solution found



Time left: 1411
------------------- QUERY 10 ----------------------
Running query 10 for 1411 seconds. Remaining: 1 queries and 1411 seconds
No solution found



Time left: -2
Out of time, terminating!
terminated-with-cleanup

BK_STOP 1678956612481

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

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="PolyORBLF-COL-S02J06T10"
export BK_EXAMINATION="LTLCardinality"
export BK_TOOL="gold2022"
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 gold2022"
echo " Input is PolyORBLF-COL-S02J06T10, examination is LTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r318-tall-167873969300291"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/PolyORBLF-COL-S02J06T10.tgz
mv PolyORBLF-COL-S02J06T10 execution
cd execution
if [ "LTLCardinality" = "ReachabilityDeadlock" ] || [ "LTLCardinality" = "UpperBounds" ] || [ "LTLCardinality" = "QuasiLiveness" ] || [ "LTLCardinality" = "StableMarking" ] || [ "LTLCardinality" = "Liveness" ] || [ "LTLCardinality" = "OneSafe" ] || [ "LTLCardinality" = "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 [ "LTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLCardinality" != "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 "LTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property LTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "LTLCardinality.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 '' LTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "LTLCardinality" = "ReachabilityDeadlock" ] || [ "LTLCardinality" = "QuasiLiveness" ] || [ "LTLCardinality" = "StableMarking" ] || [ "LTLCardinality" = "Liveness" ] || [ "LTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME LTLCardinality"
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 ;