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.r030-oct2-167813614500077.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 gold2022
Input is ASLink-PT-06b, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r030-oct2-167813614500077
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 1.4M
-rw-r--r-- 1 mcc users 7.5K Feb 26 13:12 CTLCardinality.txt
-rw-r--r-- 1 mcc users 84K Feb 26 13:12 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.8K Feb 26 13:12 CTLFireability.txt
-rw-r--r-- 1 mcc users 54K Feb 26 13:12 CTLFireability.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.0K Jan 29 11:40 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 4 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 3.8K Feb 25 15:29 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 15:29 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.1K Feb 25 15:29 LTLFireability.txt
-rw-r--r-- 1 mcc users 15K Feb 25 15:29 LTLFireability.xml
-rw-r--r-- 1 mcc users 921K Mar 5 18:22 model.pnml
-rw-r--r-- 1 mcc users 12K Feb 26 13:13 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 127K Feb 26 13:13 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.6K Feb 26 13:13 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 84K Feb 26 13:13 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 15:29 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 15:29 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 ASLink-PT-06b-ReachabilityCardinality-00
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-01
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-02
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-03
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-04
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-05
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-06
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-07
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-08
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-09
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-10
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-11
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-12
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-13
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-14
FORMULA_NAME ASLink-PT-06b-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1678415773893

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 ReachabilityCardinality *
**********************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa
MF=/home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop
Time left: 3589
---------------------------------------------------
Step -1: Stripping Colors
---------------------------------------------------
Verifying stripped models (16 in total)
/home/mcc/BenchKit/bin/verifypn -n -c -q 718 -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 ./ReachabilityCardinality.xml
CPN OverApproximation is only usable on colored models
Time left: 3589
---------------------------------------------------
Step 0: Parallel Simplification
---------------------------------------------------
Doing parallel simplification (16 in total)
Total simplification timout is 718 -- reduction timeout is 299
timeout 3589 /home/mcc/BenchKit/bin/verifypn -n -q 718 -l 29 -d 299 -z 4 -s OverApprox --binary-query-io 2 --write-simplified /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./ReachabilityCardinality.xml
FORMULA ASLink-PT-06b-ReachabilityCardinality-07 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX
Query index 7 was solved

Query is satisfied.
Solution found by parallel simplification (step 0)
Time left: 3148

---------------------------------------------------
Step 1: Parallel processing
---------------------------------------------------
Doing parallel verification of individual queries (15 in total)
Each query is verified by 4 parallel strategies for 256 seconds
------------------- QUERY 1 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.001324 on verification
@@@0.08,11920@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 1 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-02 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3147
------------------- QUERY 2 ----------------------
No solution found



Time left: 2888
------------------- QUERY 3 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.07759 on verification
@@@0.21,11832@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 3 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-09 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2888
------------------- QUERY 4 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.001468 on verification
@@@0.06,11884@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BestFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 4 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-00 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2887
------------------- QUERY 5 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.000854 on verification
@@@0.04,11840@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 5 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-10 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2887
------------------- QUERY 6 ----------------------
No solution found



Time left: 2629
------------------- QUERY 7 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.001618 on verification
@@@0.07,11968@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 7 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-15 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2628
------------------- QUERY 8 ----------------------
No solution found



Time left: 2369
------------------- QUERY 9 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.0016 on verification
@@@0.12,11932@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 9 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-05 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2369
------------------- QUERY 10 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is satisfied.


Solved using Trace Abstraction Refinement

Spent 39.8146 on verification
@@@39.90,12044@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 10 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-11 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2329
------------------- QUERY 11 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.067549 on verification
@@@0.13,11924@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BestFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 11 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-13 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2328
------------------- QUERY 12 ----------------------
No solution found



Time left: 2070
------------------- QUERY 13 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.181387 on verification
@@@0.28,11968@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 13 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-01 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2069
------------------- QUERY 14 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.007813 on verification
@@@0.09,11844@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 14 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-14 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2069
------------------- QUERY 15 ----------------------
No solution found



Time left: 1811
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 5 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 512 seconds)
Time left: 1811
------------------- QUERY 2 ----------------------
Running query 2 for 512 seconds. Remaining: 5 queries and 1811 seconds
No solution found



Time left: 1297
------------------- QUERY 6 ----------------------
Running query 6 for 512 seconds. Remaining: 4 queries and 1297 seconds
No solution found



Time left: 783
------------------- QUERY 8 ----------------------
Running query 8 for 512 seconds. Remaining: 3 queries and 783 seconds
No solution found



Time left: 268
------------------- QUERY 12 ----------------------
Time left: 268
---------------------------------------------------
Step 4: Random Parallel processing
---------------------------------------------------
Doing random parallel verification of individual queries (5 in total)
Each query is verified by 4 parallel strategies for 53 seconds
------------------- QUERY 2 ----------------------
No solution found



Time left: 212
------------------- QUERY 6 ----------------------
Solution found in random processing (step 4)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.018286 on verification
@@@0.11,13432@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ RDFS\ --seed-offset\ 0\ -q\ 3590\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 6 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-06 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 212
------------------- QUERY 8 ----------------------
No solution found



Time left: 157
------------------- QUERY 12 ----------------------
Solution found in random processing (step 4)
Query index 0 was solved

Query is satisfied.

Spent 42.8213 on verification
@@@42.97,185392@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ RDFS\ --seed-offset\ 0\ -q\ 3590\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 12 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-03 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 114
------------------- QUERY 15 ----------------------
Solution found in random processing (step 4)
Query index 0 was solved

Query is satisfied.

Spent 0.002615 on verification
@@@0.06,11820@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ RDFS\ --seed-offset\ 2018\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.SEBOTplyop /home/mcc/BenchKit/bin/tmp/tmp.sJPVpGCpUa --binary-query-io 1 -x 15 -n

FORMULA ASLink-PT-06b-ReachabilityCardinality-04 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 114
Time left: 114
---------------------------------------------------
Step 4: Random Parallel processing
---------------------------------------------------
Doing random parallel verification of individual queries (2 in total)
Each query is verified by 4 parallel strategies for 57 seconds
------------------- QUERY 2 ----------------------
No solution found



Time left: 54
------------------- QUERY 8 ----------------------
No solution found



Time left: -3
Out of time, terminating!
terminated-with-cleanup

BK_STOP 1678419366811

--------------------
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="ASLink-PT-06b"
export BK_EXAMINATION="ReachabilityCardinality"
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 ASLink-PT-06b, 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 r030-oct2-167813614500077"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/ASLink-PT-06b.tgz
mv ASLink-PT-06b 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 ;