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.r327-tall-167889199800591.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 lolaxred
Input is RefineWMG-PT-010011, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r327-tall-167889199800591
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 476K
-rw-r--r-- 1 mcc users 6.5K Feb 26 15:52 CTLCardinality.txt
-rw-r--r-- 1 mcc users 71K Feb 26 15:52 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.8K Feb 26 15:50 CTLFireability.txt
-rw-r--r-- 1 mcc users 70K Feb 26 15:50 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 5.9K Jan 29 11:41 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.7K Feb 25 16:43 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Feb 25 16:43 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Feb 25 16:43 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 16:43 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.6K Feb 26 15:52 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 103K Feb 26 15:52 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.1K Feb 26 15:52 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 71K Feb 26 15:52 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 16:43 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Feb 25 16:43 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 7 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 24K 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 RefineWMG-PT-010011-ReachabilityFireability-00
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-01
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-02
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-03
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-04
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-05
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-06
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-07
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-08
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-09
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-10
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-11
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-12
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-13
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-14
FORMULA_NAME RefineWMG-PT-010011-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1679052994262

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=lolaxred
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=RefineWMG-PT-010011
Applying reductions before tool lola
Invoking reducer
Running Version 202303021504
[2023-03-17 11:36:35] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -timeout, 360, -rebuildPNML]
[2023-03-17 11:36:35] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-17 11:36:35] [INFO ] Load time of PNML (sax parser for PT used): 26 ms
[2023-03-17 11:36:35] [INFO ] Transformed 54 places.
[2023-03-17 11:36:35] [INFO ] Transformed 43 transitions.
[2023-03-17 11:36:35] [INFO ] Parsed PT model containing 54 places and 43 transitions and 128 arcs in 203 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 12 ms.
Working with output stream class java.io.PrintStream
FORMULA RefineWMG-PT-010011-ReachabilityFireability-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10005 steps, including 2 resets, run finished after 86 ms. (steps per millisecond=116 ) properties (out of 15) seen :13
FORMULA RefineWMG-PT-010011-ReachabilityFireability-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-14 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-13 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-12 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-10 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-04 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-03 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RefineWMG-PT-010011-ReachabilityFireability-00 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 33 ms. (steps per millisecond=303 ) properties (out of 2) 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 2) seen :1
FORMULA RefineWMG-PT-010011-ReachabilityFireability-09 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Running SMT prover for 1 properties.
// Phase 1: matrix 43 rows 54 cols
[2023-03-17 11:36:36] [INFO ] Computed 22 place invariants in 5 ms
[2023-03-17 11:36:36] [INFO ] [Real]Absence check using 22 positive place invariants in 10 ms returned sat
[2023-03-17 11:36:36] [INFO ] After 163ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2023-03-17 11:36:36] [INFO ] [Nat]Absence check using 22 positive place invariants in 10 ms returned sat
[2023-03-17 11:36:36] [INFO ] After 26ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2023-03-17 11:36:36] [INFO ] After 56ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 13 ms.
[2023-03-17 11:36:36] [INFO ] After 116ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
Finished Parikh walk after 208 steps, including 0 resets, run visited all 1 properties in 2 ms. (steps per millisecond=104 )
FORMULA RefineWMG-PT-010011-ReachabilityFireability-07 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 3 ms.
All properties solved without resorting to model-checking.
Total runtime 851 ms.
starting LoLA
BK_INPUT RefineWMG-PT-010011
BK_EXAMINATION: ReachabilityFireability
bin directory: /home/mcc/BenchKit/bin//../reducer/bin//../../lola/bin/
current directory: /home/mcc/execution
ReachabilityFireability

FORMULA RefineWMG-PT-010011-ReachabilityFireability-05 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA RefineWMG-PT-010011-ReachabilityFireability-06 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

FORMULA RefineWMG-PT-010011-ReachabilityFireability-09 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

BK_STOP 1679052997921

--------------------
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 ReachabilityFireability -timeout 360 -rebuildPNML
lola: MEM LIMIT 32
lola: MEM LIMIT 5
lola: NET
lola: input: PNML file (--pnmlnet)
lola: reading net from /home/mcc/execution/model.pnml
lola: reading pnml
lola: PNML file contains place/transition net
lola: finished parsing
lola: closed net file /home/mcc/execution/model.pnml
lola: Reading formula.
lola: Using XML format (--xmlformula)
lola: reading XML formula
lola: reading formula from /home/mcc/execution/ReachabilityFireability.xml
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Rule S: 0 transitions removed,0 places removed
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: Created skeleton in 0.000000 secs.
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: LAUNCH task # 56 (type EXCL) for 15 RefineWMG-PT-010011-ReachabilityFireability-05
lola: time limit : 180 sec
lola: memory limit: 32 pages
lola: LAUNCH task # 52 (type FNDP) for 15 RefineWMG-PT-010011-ReachabilityFireability-05
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 53 (type EQUN) for 15 RefineWMG-PT-010011-ReachabilityFireability-05
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: LAUNCH task # 55 (type SRCH) for 15 RefineWMG-PT-010011-ReachabilityFireability-05
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: FINISHED task # 56 (type EXCL) for RefineWMG-PT-010011-ReachabilityFireability-05
lola: result : true
lola: markings : 7
lola: fired transitions : 6
lola: time used : 0.000000
lola: memory pages used : 1
lola: CANCELED task # 52 (type FNDP) for RefineWMG-PT-010011-ReachabilityFireability-05 (obsolete)
lola: CANCELED task # 53 (type EQUN) for RefineWMG-PT-010011-ReachabilityFireability-05 (obsolete)
lola: CANCELED task # 55 (type SRCH) for RefineWMG-PT-010011-ReachabilityFireability-05 (obsolete)
lola: LAUNCH task # 62 (type EXCL) for 18 RefineWMG-PT-010011-ReachabilityFireability-06
lola: time limit : 189 sec
lola: memory limit: 32 pages
lola: LAUNCH task # 58 (type FNDP) for 18 RefineWMG-PT-010011-ReachabilityFireability-06
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 59 (type EQUN) for 18 RefineWMG-PT-010011-ReachabilityFireability-06
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 61 (type SRCH) for 18 RefineWMG-PT-010011-ReachabilityFireability-06
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: FINISHED task # 62 (type EXCL) for RefineWMG-PT-010011-ReachabilityFireability-06
lola: result : true
lola: markings : 17
lola: fired transitions : 16
lola: time used : 0.000000
lola: memory pages used : 1
lola: CANCELED task # 58 (type FNDP) for RefineWMG-PT-010011-ReachabilityFireability-06 (obsolete)
lola: CANCELED task # 59 (type EQUN) for RefineWMG-PT-010011-ReachabilityFireability-06 (obsolete)
lola: CANCELED task # 61 (type SRCH) for RefineWMG-PT-010011-ReachabilityFireability-06 (obsolete)
lola: Created skeleton in 0.000000 secs.
lola: FINISHED task # 52 (type FNDP) for RefineWMG-PT-010011-ReachabilityFireability-05
lola: result : true
lola: fired transitions : 1
lola: tried executions : 1
lola: time used : 0.000000
lola: memory pages used : 0
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: LAUNCH task # 72 (type EXCL) for 27 RefineWMG-PT-010011-ReachabilityFireability-09
lola: time limit : 200 sec
lola: memory limit: 32 pages
lola: LAUNCH task # 64 (type FNDP) for 27 RefineWMG-PT-010011-ReachabilityFireability-09
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 65 (type EQUN) for 27 RefineWMG-PT-010011-ReachabilityFireability-09
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 71 (type SRCH) for 27 RefineWMG-PT-010011-ReachabilityFireability-09
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: FINISHED task # 72 (type EXCL) for RefineWMG-PT-010011-ReachabilityFireability-09
lola: result : true
lola: markings : 32
lola: fired transitions : 35
lola: time used : 0.000000
lola: memory pages used : 1
lola: CANCELED task # 64 (type FNDP) for RefineWMG-PT-010011-ReachabilityFireability-09 (obsolete)
lola: CANCELED task # 65 (type EQUN) for RefineWMG-PT-010011-ReachabilityFireability-09 (obsolete)
lola: CANCELED task # 71 (type SRCH) for RefineWMG-PT-010011-ReachabilityFireability-09 (obsolete)
lola: LAUNCH task # 78 (type EXCL) for 30 RefineWMG-PT-010011-ReachabilityFireability-10
lola: time limit : 225 sec
lola: memory limit: 32 pages
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: LAUNCH task # 74 (type FNDP) for 30 RefineWMG-PT-010011-ReachabilityFireability-10
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 75 (type EQUN) for 30 RefineWMG-PT-010011-ReachabilityFireability-10
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
lola: LAUNCH task # 77 (type SRCH) for 30 RefineWMG-PT-010011-ReachabilityFireability-10
lola: time limit : 32000000 sec
lola: memory limit: 5 pages
sara: try reading problem file /home/mcc/execution/ReachabilityFireability-59.sara.
sara: try reading problem file /home/mcc/execution/ReachabilityFireability-53.sara.
lola: FINISHED task # 58 (type FNDP) for RefineWMG-PT-010011-ReachabilityFireability-06
lola: result : true
lola: fired transitions : 10
lola: tried executions : 1
lola: time used : 0.000000
lola: memory pages used : 0
lola: Created skeleton in 0.000000 secs.
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711
lola: rewrite Frontend/Parser/formula_rewrite.k:711


/home/mcc/BenchKit/bin//../reducer/bin//../../lola/bin//../BenchKit_head.sh: line 63: 457 Segmentation fault lola --conf=$BIN_DIR/configfiles/reachabilityfireabilityconf --formula=$DIR/ReachabilityFireability.xml --verdictfile=$DIR/GenericPropertiesVerdict.xml $DIR/model.pnml

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="RefineWMG-PT-010011"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="lolaxred"
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 lolaxred"
echo " Input is RefineWMG-PT-010011, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r327-tall-167889199800591"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/RefineWMG-PT-010011.tgz
mv RefineWMG-PT-010011 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "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 "ReachabilityFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityFireability.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 '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;