fond
Model Checking Contest 2023
13th edition, Paris, France, April 26, 2023 (at TOOLympics II)
Execution of r393-oct2-167903717200582
Last Updated
May 14, 2023

About the Execution of LTSMin+red for ShieldPPPt-PT-004A

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
199.752 5460.00 14362.00 22.50 TTTFTTTFTFTFTFFF normal

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.r393-oct2-167903717200582.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 ltsminxred
Input is ShieldPPPt-PT-004A, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r393-oct2-167903717200582
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 488K
-rw-r--r-- 1 mcc users 6.1K Feb 25 20:52 CTLCardinality.txt
-rw-r--r-- 1 mcc users 66K Feb 25 20:52 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.3K Feb 25 20:50 CTLFireability.txt
-rw-r--r-- 1 mcc users 51K Feb 25 20:50 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K Jan 29 11:41 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.8K Feb 25 17:00 LTLCardinality.txt
-rw-r--r-- 1 mcc users 27K Feb 25 17:00 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.1K Feb 25 17:00 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Feb 25 17:00 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.0K Feb 25 20:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 96K Feb 25 20:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 12K Feb 25 20:53 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 116K Feb 25 20:53 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 17:00 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Feb 25 17:00 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 27K Mar 5 18:23 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 ShieldPPPt-PT-004A-ReachabilityCardinality-00
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-01
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-02
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-03
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-04
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-05
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-06
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-07
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-08
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-09
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-10
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-11
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-12
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-13
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-14
FORMULA_NAME ShieldPPPt-PT-004A-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1679460336848

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=ltsminxred
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=ShieldPPPt-PT-004A
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-22 04:45:39] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2023-03-22 04:45:39] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-22 04:45:39] [INFO ] Load time of PNML (sax parser for PT used): 44 ms
[2023-03-22 04:45:39] [INFO ] Transformed 103 places.
[2023-03-22 04:45:39] [INFO ] Transformed 75 transitions.
[2023-03-22 04:45:39] [INFO ] Found NUPN structural information;
[2023-03-22 04:45:39] [INFO ] Parsed PT model containing 103 places and 75 transitions and 294 arcs in 138 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 14 ms.
Working with output stream class java.io.PrintStream
Ensure Unique test removed 1 transitions
Reduce redundant transitions removed 1 transitions.
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-01 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-02 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-04 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-10 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-13 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 2 resets, run finished after 162 ms. (steps per millisecond=61 ) properties (out of 10) seen :9
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-11 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-09 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Finished Best-First random walk after 3927 steps, including 1 resets, run visited all 1 properties in 29 ms. (steps per millisecond=135 )
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-06 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
All properties solved without resorting to model-checking.
Total runtime 449 ms.
pnml2lts-sym model.pnml --lace-workers=4 --vset=lddmc --saturation=sat -rbs,w2W,ru,hf --sylvan-sizes=20,28,20,28 --invariant=/tmp/450/inv_0_ --invariant=/tmp/450/inv_1_ --invariant=/tmp/450/inv_2_ --invariant=/tmp/450/inv_3_ --invariant=/tmp/450/inv_4_ --invariant=/tmp/450/inv_5_ --invariant=/tmp/450/inv_6_ --invariant=/tmp/450/inv_7_ --invariant=/tmp/450/inv_8_ --invariant=/tmp/450/inv_9_ --invariant=/tmp/450/inv_10_ --invariant=/tmp/450/inv_11_ --invariant=/tmp/450/inv_12_ --invariant=/tmp/450/inv_13_ --invariant=/tmp/450/inv_14_ --invariant=/tmp/450/inv_15_ --inv-par
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-00 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-01 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-02 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-03 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-04 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-05 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-06 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-07 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-08 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-09 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-10 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-11 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-12 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-13 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-14 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA ShieldPPPt-PT-004A-ReachabilityCardinality-15 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN

BK_STOP 1679460342308

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

+ 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//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -timeout 360 -rebuildPNML
mcc2023
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-00
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_0_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-01
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_1_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-02
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_2_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-03
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_3_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-04
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_4_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-05
rfs formula type EF
rfs formula formula --invariant=/tmp/450/inv_5_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-06
rfs formula type EF
rfs formula formula --invariant=/tmp/450/inv_6_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-07
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_7_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-08
rfs formula type EF
rfs formula formula --invariant=/tmp/450/inv_8_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-09
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_9_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-10
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_10_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-11
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_11_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-12
rfs formula type EF
rfs formula formula --invariant=/tmp/450/inv_12_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-13
rfs formula type EF
rfs formula formula --invariant=/tmp/450/inv_13_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-14
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_14_
rfs formula name ShieldPPPt-PT-004A-ReachabilityCardinality-15
rfs formula type AG
rfs formula formula --invariant=/tmp/450/inv_15_
pnml2lts-sym: Exploration order is bfs-prev
pnml2lts-sym: Saturation strategy is sat
pnml2lts-sym: Guided search strategy is unguided
pnml2lts-sym: Attractor strategy is default
pnml2lts-sym: opening model.pnml
pnml2lts-sym: Edge label is id
Warning: program compiled against libxml 210 using older 209
pnml2lts-sym: Petri net has 103 places, 75 transitions and 294 arcs
pnml2lts-sym: Petri net ShieldPPPt-PT-004A analyzed
pnml2lts-sym: There are safe places
pnml2lts-sym: Loading Petri net took 0.000 real 0.000 user 0.000 sys
pnml2lts-sym: Initializing regrouping layer
pnml2lts-sym: Regroup specification: bs,w2W,ru,hf
pnml2lts-sym: Regroup Boost's Sloan
pnml2lts-sym: Regroup over-approximate must-write to may-write
pnml2lts-sym: Regroup Row sUbsume
pnml2lts-sym: Reqroup Horizontal Flip
pnml2lts-sym: Regrouping: 75->59 groups
pnml2lts-sym: Regrouping took 0.010 real 0.010 user 0.000 sys
pnml2lts-sym: state vector length is 103; there are 59 groups
pnml2lts-sym: Creating a multi-core ListDD domain.
pnml2lts-sym: Sylvan allocates 15.000 GB virtual memory for nodes table and operation cache.
pnml2lts-sym: Initial nodes table and operation cache requires 60.00 MB.
pnml2lts-sym: Using GBgetTransitionsShortR2W as next-state function
pnml2lts-sym: got initial state
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_15_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_14_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_5_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_12_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_11_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_9_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_3_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_8_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_7_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym:
pnml2lts-sym: Invariant violation (/tmp/450/inv_6_) found at depth -1!
pnml2lts-sym:
pnml2lts-sym: Exploration took 14358 group checks and 0 next state calls
pnml2lts-sym: reachability took 0.480 real 1.870 user 0.000 sys
pnml2lts-sym: counting visited states...
pnml2lts-sym: counting took 0.000 real 0.000 user 0.000 sys
pnml2lts-sym: state space has 512000000000001 states, 348 nodes
pnml2lts-sym: group_next: 570 nodes total
pnml2lts-sym: group_explored: 230 nodes, 230 short vectors total
pnml2lts-sym: max token count: 1

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="ShieldPPPt-PT-004A"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="ltsminxred"
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 ltsminxred"
echo " Input is ShieldPPPt-PT-004A, 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 r393-oct2-167903717200582"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/ShieldPPPt-PT-004A.tgz
mv ShieldPPPt-PT-004A 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 ;