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.r254-tall-167856439600286.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 LamportFastMutEx-COL-7, examination is LTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r254-tall-167856439600286
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 552K
-rw-r--r-- 1 mcc users 9.5K Feb 25 13:43 CTLCardinality.txt
-rw-r--r-- 1 mcc users 105K Feb 25 13:43 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.8K Feb 25 13:41 CTLFireability.txt
-rw-r--r-- 1 mcc users 45K Feb 25 13:41 CTLFireability.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 equiv_pt
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K Jan 29 11:40 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 2 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 4.1K Feb 25 16:20 LTLCardinality.txt
-rw-r--r-- 1 mcc users 29K Feb 25 16:20 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K Feb 25 16:20 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:20 LTLFireability.xml
-rw-r--r-- 1 mcc users 43K Mar 5 18:22 model.pnml
-rw-r--r-- 1 mcc users 13K Feb 25 13:49 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 121K Feb 25 13:49 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Feb 25 13:47 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 79K Feb 25 13:47 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K Feb 25 16:20 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 16:20 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 LamportFastMutEx-COL-7-LTLFireability-00
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-01
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-02
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-03
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-04
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-05
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-06
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-07
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-08
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-09
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-10
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-11
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-12
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-13
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-14
FORMULA_NAME LamportFastMutEx-COL-7-LTLFireability-15

=== Now, execution of the tool begins

BK_START 1678701899627

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 LTLFireability *
*************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY
MF=/home/mcc/BenchKit/bin/tmp/tmp.OBN9R1aCM5
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 ./LTLFireability.xml
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-15
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-14
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-13
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-12
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-11
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-10
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-09
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-08
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-07
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-06
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-05
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-04
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-03
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-02
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-01
Warning: CPN OverApproximation is only available for Reachability queries without deadlock, negated fireability and UpperBounds, skipping LamportFastMutEx-COL-7-LTLFireability-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.2VYy7zWWmY --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.OBN9R1aCM5 -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./LTLFireability.xml
FORMULA LamportFastMutEx-COL-7-LTLFireability-01 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 1 was solved

Query is NOT satisfied.

FORMULA LamportFastMutEx-COL-7-LTLFireability-02 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 2 was solved

Query is satisfied.

FORMULA LamportFastMutEx-COL-7-LTLFireability-08 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 8 was solved

Query is satisfied.

FORMULA LamportFastMutEx-COL-7-LTLFireability-12 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 12 was solved

Query is satisfied.

FORMULA LamportFastMutEx-COL-7-LTLFireability-13 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX UNFOLDING_TO_PT
Query index 13 was solved

Query is NOT 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: 3304

---------------------------------------------------
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 NOT satisfied.
Spent 0.707898 on verification
@@@0.72,24804@@@
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 1 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-14 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 3303
------------------- QUERY 2 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.064682 on verification
@@@0.08,151364@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -ltl\ tarjan\ --ltl-heur\ fire-count\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 2 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-09 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC LOGFIRECOUNT_HEUR(5000) OPTIM-1
Time left: 3302
------------------- QUERY 3 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.054115 on verification
@@@0.06,151504@@@
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 3 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-03 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 3302
------------------- QUERY 4 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.050135 on verification
FORMULA LamportFastMutEx-COL-7-LTLFireability-15 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1

Query index 0 was solved
Query is NOT satisfied.
Spent 0.015594 on verification
@@@0.04,22120@@@
@@@0.06,149660@@@
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 4 -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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 4 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-15 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 3302
------------------- QUERY 5 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.014252 on verification
@@@0.04,22460@@@
FORMULA LamportFastMutEx-COL-7-LTLFireability-06 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1

Query index 0 was solved
Query is NOT satisfied.
Spent 0.051233 on verification
@@@0.06,149884@@@
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 5 -n
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 5 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-06 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 3301
------------------- QUERY 6 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.051013 on verification
FORMULA LamportFastMutEx-COL-7-LTLFireability-07 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1

Query index 0 was solved
Query is NOT satisfied.
@@@0.06,149360@@@
Spent 0.028458 on verification
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 6 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-07 FALSE TECHNIQUES EXPLICIT TARJAN WEAK_SKIP STUBBORN AUT_STUB HEURISTIC DIST_HEUR OPTIM-1
Time left: 3301
------------------- QUERY 7 ----------------------
No solution found



Time left: 3000
------------------- QUERY 8 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.013813 on verification
@@@0.02,22016@@@
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 8 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-10 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 2999
------------------- QUERY 9 ----------------------
Solution found by parallel processing (step 1)

Query index 0 was solved
Query is NOT satisfied.
Spent 0.013385 on verification
@@@0.02,21988@@@
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.OBN9R1aCM5 /home/mcc/BenchKit/bin/tmp/tmp.2VYy7zWWmY --binary-query-io 1 -x 9 -n

FORMULA LamportFastMutEx-COL-7-LTLFireability-04 FALSE TECHNIQUES EXPLICIT NDFS WEAK_SKIP HEURISTIC AUTOMATON_HEUR OPTIM-1
Time left: 2999
------------------- QUERY 10 ----------------------
No solution found



Time left: 2698
------------------- QUERY 11 ----------------------
No solution found



Time left: 2396
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 3 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 598 seconds)
Time left: 2396
------------------- QUERY 7 ----------------------
Running query 7 for 798 seconds. Remaining: 3 queries and 2396 seconds
No solution found



Time left: 1595
------------------- QUERY 10 ----------------------
Running query 10 for 797 seconds. Remaining: 2 queries and 1595 seconds
No solution found



Time left: 796
------------------- QUERY 11 ----------------------
Running query 11 for 796 seconds. Remaining: 1 queries and 796 seconds
No solution found



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

BK_STOP 1678705491580

--------------------
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="LamportFastMutEx-COL-7"
export BK_EXAMINATION="LTLFireability"
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 LamportFastMutEx-COL-7, examination is LTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r254-tall-167856439600286"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/LamportFastMutEx-COL-7.tgz
mv LamportFastMutEx-COL-7 execution
cd execution
if [ "LTLFireability" = "ReachabilityDeadlock" ] || [ "LTLFireability" = "UpperBounds" ] || [ "LTLFireability" = "QuasiLiveness" ] || [ "LTLFireability" = "StableMarking" ] || [ "LTLFireability" = "Liveness" ] || [ "LTLFireability" = "OneSafe" ] || [ "LTLFireability" = "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 [ "LTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLFireability" != "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 "LTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property LTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "LTLFireability.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 '' LTLFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "LTLFireability" = "ReachabilityDeadlock" ] || [ "LTLFireability" = "QuasiLiveness" ] || [ "LTLFireability" = "StableMarking" ] || [ "LTLFireability" = "Liveness" ] || [ "LTLFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME LTLFireability"
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 ;