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.r169-tall-167838855700294.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)
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=====================================================================
Generated by BenchKit 2-5348
Executing tool ltsminxred
Input is FMS-PT-50000, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r169-tall-167838855700294
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 456K
-rw-r--r-- 1 mcc users 7.0K Feb 25 19:44 CTLCardinality.txt
-rw-r--r-- 1 mcc users 74K Feb 25 19:44 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.2K Feb 25 19:42 CTLFireability.txt
-rw-r--r-- 1 mcc users 60K Feb 25 19:42 CTLFireability.xml
-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 3.5K Feb 25 16:05 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Feb 25 16:05 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.1K Feb 25 16:05 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:05 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Feb 25 19:45 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 108K Feb 25 19:45 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.0K Feb 25 19:45 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 69K Feb 25 19:45 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.5K Feb 25 16:05 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 16:05 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 16K Mar 5 18:22 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 FMS-PT-50000-ReachabilityCardinality-00
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-01
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-02
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-03
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-04
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-05
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-06
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-07
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-08
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-09
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-10
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-11
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-12
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-13
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-14
FORMULA_NAME FMS-PT-50000-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1678503612027

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=FMS-PT-50000
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-11 03:00:13] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2023-03-11 03:00:13] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-11 03:00:13] [INFO ] Load time of PNML (sax parser for PT used): 22 ms
[2023-03-11 03:00:13] [INFO ] Transformed 22 places.
[2023-03-11 03:00:13] [INFO ] Transformed 20 transitions.
[2023-03-11 03:00:13] [INFO ] Parsed PT model containing 22 places and 20 transitions and 50 arcs in 81 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 15 ms.
Working with output stream class java.io.PrintStream
FORMULA FMS-PT-50000-ReachabilityCardinality-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 50001 steps, including 0 resets, run finished after 40 ms. (steps per millisecond=1250 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 54 ms. (steps per millisecond=18 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 22 ms. (steps per millisecond=45 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 20 ms. (steps per millisecond=50 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 18 ms. (steps per millisecond=55 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=41 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 15) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 15) seen :1
FORMULA FMS-PT-50000-ReachabilityCardinality-15 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Interrupted probabilistic random walk after 175932 steps, run timeout after 3001 ms. (steps per millisecond=58 ) properties seen :{8=1}
Probabilistic random walk after 175932 steps, saw 129225 distinct states, run finished after 3002 ms. (steps per millisecond=58 ) properties seen :1
FORMULA FMS-PT-50000-ReachabilityCardinality-08 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
Running SMT prover for 13 properties.
// Phase 1: matrix 20 rows 22 cols
[2023-03-11 03:00:16] [INFO ] Computed 6 place invariants in 6 ms
[2023-03-11 03:00:17] [INFO ] [Real]Absence check using 6 positive place invariants in 5 ms returned sat
[2023-03-11 03:00:17] [INFO ] After 20ms SMT Verify possible using state equation in real domain returned unsat :1 sat :1 real:11
[2023-03-11 03:00:17] [INFO ] After 26ms SMT Verify possible using trap constraints in real domain returned unsat :1 sat :0 real:12
[2023-03-11 03:00:17] [INFO ] After 237ms SMT Verify possible using all constraints in real domain returned unsat :1 sat :0 real:12
[2023-03-11 03:00:17] [INFO ] [Nat]Absence check using 6 positive place invariants in 1 ms returned sat
[2023-03-11 03:00:17] [INFO ] After 84ms SMT Verify possible using state equation in natural domain returned unsat :4 sat :9
[2023-03-11 03:00:17] [INFO ] After 172ms SMT Verify possible using trap constraints in natural domain returned unsat :4 sat :9
Attempting to minimize the solution found.
Minimization took 81 ms.
[2023-03-11 03:00:17] [INFO ] After 384ms SMT Verify possible using all constraints in natural domain returned unsat :4 sat :9
FORMULA FMS-PT-50000-ReachabilityCardinality-13 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA FMS-PT-50000-ReachabilityCardinality-12 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA FMS-PT-50000-ReachabilityCardinality-11 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA FMS-PT-50000-ReachabilityCardinality-01 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 13 Parikh solutions to 9 different solutions.
FORMULA FMS-PT-50000-ReachabilityCardinality-07 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA FMS-PT-50000-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA FMS-PT-50000-ReachabilityCardinality-02 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA FMS-PT-50000-ReachabilityCardinality-09 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA FMS-PT-50000-ReachabilityCardinality-06 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA FMS-PT-50000-ReachabilityCardinality-14 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 6 properties in 17275 ms.
Support contains 22 out of 22 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 22/22 places, 20/20 transitions.
Applied a total of 0 rules in 23 ms. Remains 22 /22 variables (removed 0) and now considering 20/20 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 23 ms. Remains : 22/22 places, 20/20 transitions.
Incomplete random walk after 50001 steps, including 0 resets, run finished after 15 ms. (steps per millisecond=3333 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 33 ms. (steps per millisecond=303 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 21 ms. (steps per millisecond=476 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 11 ms. (steps per millisecond=909 ) properties (out of 3) seen :0
Interrupted probabilistic random walk after 429385 steps, run timeout after 3001 ms. (steps per millisecond=143 ) properties seen :{}
Probabilistic random walk after 429385 steps, saw 333489 distinct states, run finished after 3001 ms. (steps per millisecond=143 ) properties seen :0
Running SMT prover for 3 properties.
[2023-03-11 03:00:38] [INFO ] Invariant cache hit.
[2023-03-11 03:00:38] [INFO ] [Real]Absence check using 6 positive place invariants in 1 ms returned sat
[2023-03-11 03:00:38] [INFO ] After 63ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:3
[2023-03-11 03:00:38] [INFO ] [Nat]Absence check using 6 positive place invariants in 7 ms returned sat
[2023-03-11 03:00:38] [INFO ] After 27ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :3
[2023-03-11 03:00:38] [INFO ] After 49ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :3
Attempting to minimize the solution found.
Minimization took 20 ms.
[2023-03-11 03:00:38] [INFO ] After 119ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :3
FORMULA FMS-PT-50000-ReachabilityCardinality-00 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 6000 ms.
Support contains 17 out of 22 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 22/22 places, 20/20 transitions.
Applied a total of 0 rules in 5 ms. Remains 22 /22 variables (removed 0) and now considering 20/20 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 5 ms. Remains : 22/22 places, 20/20 transitions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 22/22 places, 20/20 transitions.
Applied a total of 0 rules in 1 ms. Remains 22 /22 variables (removed 0) and now considering 20/20 (removed 0) transitions.
[2023-03-11 03:00:44] [INFO ] Invariant cache hit.
[2023-03-11 03:00:44] [INFO ] Implicit Places using invariants in 34 ms returned []
[2023-03-11 03:00:44] [INFO ] Invariant cache hit.
[2023-03-11 03:00:44] [INFO ] Implicit Places using invariants and state equation in 36 ms returned []
Implicit Place search using SMT with State Equation took 74 ms to find 0 implicit places.
[2023-03-11 03:00:44] [INFO ] Redundant transitions in 0 ms returned []
[2023-03-11 03:00:44] [INFO ] Invariant cache hit.
[2023-03-11 03:00:44] [INFO ] Dead Transitions using invariants and state equation in 35 ms found 0 transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 123 ms. Remains : 22/22 places, 20/20 transitions.
Applied a total of 0 rules in 1 ms. Remains 22 /22 variables (removed 0) and now considering 20/20 (removed 0) transitions.
Running SMT prover for 2 properties.
[2023-03-11 03:00:44] [INFO ] Invariant cache hit.
[2023-03-11 03:00:44] [INFO ] After 33ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:2
[2023-03-11 03:00:44] [INFO ] [Nat]Absence check using 6 positive place invariants in 1 ms returned sat
[2023-03-11 03:00:44] [INFO ] After 25ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :2
[2023-03-11 03:00:44] [INFO ] After 38ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :2
Attempting to minimize the solution found.
Minimization took 11 ms.
[2023-03-11 03:00:44] [INFO ] After 75ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :2
[2023-03-11 03:00:44] [INFO ] Export to MCC of 2 properties in file /home/mcc/execution/ReachabilityCardinality.sr.xml took 5 ms.
[2023-03-11 03:00:44] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 22 places, 20 transitions and 50 arcs took 1 ms.
[2023-03-11 03:00:44] [INFO ] Flatten gal took : 16 ms
Total runtime 31155 ms.
There are residual formulas that ITS could not solve within timeout
pnml2lts-sym model.pnml --lace-workers=4 --vset=lddmc --saturation=sat -rbs,w2W,ru,hf --sylvan-sizes=20,28,20,28 --invariant=/tmp/481/inv_0_ --invariant=/tmp/481/inv_1_ --inv-par
Could not compute solution for formula : FMS-PT-50000-ReachabilityCardinality-04
Could not compute solution for formula : FMS-PT-50000-ReachabilityCardinality-05

BK_STOP 1678503724100

--------------------
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 FMS-PT-50000-ReachabilityCardinality-04
rfs formula type AG
rfs formula formula --invariant=/tmp/481/inv_0_
rfs formula name FMS-PT-50000-ReachabilityCardinality-05
rfs formula type AG
rfs formula formula --invariant=/tmp/481/inv_1_
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 22 places, 20 transitions and 50 arcs
pnml2lts-sym: Petri net FMS_PT_50000 analyzed
pnml2lts-sym: There are no 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: 20->20 groups
pnml2lts-sym: Regrouping took 0.000 real 0.010 user 0.000 sys
pnml2lts-sym: state vector length is 22; there are 20 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: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done

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="FMS-PT-50000"
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 FMS-PT-50000, 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 r169-tall-167838855700294"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/FMS-PT-50000.tgz
mv FMS-PT-50000 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 ;