fond
Model Checking Contest 2024
14th edition, Geneva, Switzerland, June 25, 2024
Execution of r577-smll-171734920500139
Last Updated
July 7, 2024

About the Execution of LoLA for MedleyA-PT-18

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
475.752 195018.00 196982.00 521.30 TFFFTFTTFTTFFTFF normal

Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2024-input.r577-smll-171734920500139.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2024-input.qcow2 backing_fmt=qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5568
Executing tool lola
Input is MedleyA-PT-18, examination is LTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r577-smll-171734920500139
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 608K
-rw-r--r-- 1 mcc users 7.8K Jun 2 17:16 CTLCardinality.txt
-rw-r--r-- 1 mcc users 88K Jun 2 17:16 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.5K Jun 2 17:16 CTLFireability.txt
-rw-r--r-- 1 mcc users 49K Jun 2 17:16 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.6K Jun 2 17:12 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Jun 2 17:12 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Jun 2 17:12 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Jun 2 17:12 LTLFireability.xml
-rw-r--r-- 1 mcc users 1 Jun 2 16:33 NewModel
-rw-r--r-- 1 mcc users 9.7K Jun 2 17:16 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 103K Jun 2 17:16 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.1K Jun 2 17:16 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 82K Jun 2 17:16 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Jun 2 17:12 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Jun 2 17:12 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Jun 2 16:33 equiv_col
-rw-r--r-- 1 mcc users 3 Jun 2 16:33 instance
-rw-r--r-- 1 mcc users 6 Jun 2 16:33 iscolored
-rw-r--r-- 1 mcc users 158K Jun 2 16:33 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 MedleyA-PT-18-LTLCardinality-00
FORMULA_NAME MedleyA-PT-18-LTLCardinality-01
FORMULA_NAME MedleyA-PT-18-LTLCardinality-02
FORMULA_NAME MedleyA-PT-18-LTLCardinality-03
FORMULA_NAME MedleyA-PT-18-LTLCardinality-04
FORMULA_NAME MedleyA-PT-18-LTLCardinality-05
FORMULA_NAME MedleyA-PT-18-LTLCardinality-06
FORMULA_NAME MedleyA-PT-18-LTLCardinality-07
FORMULA_NAME MedleyA-PT-18-LTLCardinality-08
FORMULA_NAME MedleyA-PT-18-LTLCardinality-09
FORMULA_NAME MedleyA-PT-18-LTLCardinality-10
FORMULA_NAME MedleyA-PT-18-LTLCardinality-11
FORMULA_NAME MedleyA-PT-18-LTLCardinality-12
FORMULA_NAME MedleyA-PT-18-LTLCardinality-13
FORMULA_NAME MedleyA-PT-18-LTLCardinality-14
FORMULA_NAME MedleyA-PT-18-LTLCardinality-15

=== Now, execution of the tool begins

BK_START 1717400506066

FORMULA MedleyA-PT-18-LTLCardinality-03 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-04 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-05 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-08 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-15 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-10 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-09 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-12 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-07 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-06 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-00 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-14 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-02 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-01 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-11 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA MedleyA-PT-18-LTLCardinality-13 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
[lola] FINAL RESULTS
[lola]  FINISHED FORMULA: CATEGORY VALUE PRODUCED BY
[lola] MedleyA-PT-18-LTLCardinality-00: LTL true LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-01: LTL false LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-02: LTL false LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-03: LTL/CTL false LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-04: INITIAL true preprocessing
[lola] MedleyA-PT-18-LTLCardinality-05: LTL false LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-06: LTL true LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-07: LTL true LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-08: CONJ false findpath
[lola] MedleyA-PT-18-LTLCardinality-09: LTL/CTL true LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-10: LTL true LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-11: LTL false LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-12: CONJ false LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-13: LTL true LTL model checker
[lola] MedleyA-PT-18-LTLCardinality-14: CONJ false findpath
[lola] MedleyA-PT-18-LTLCardinality-15: LTL false LTL model checker
[lola]
[lola] Time elapsed: 195 secs. Pages in use: 2

BK_STOP 1717400701084

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

[lola][I] LoLA will run for 3600 seconds at most (--timelimit)
[lola][W] unknown unit in memory specification: using default
[lola][I] MEM LIMIT 5
[lola][I] NET
[lola][I] reading net from model.pnml
[lola][I] input: PNML file (--pnmlnet)
[lola][I] reading pnml
[lola][I] PNML file contains place/transition net
[lola][I] closed net file model.pnml
[lola][I] finished parsing
[lola][I] Reading formula.
[lola][I] Using XML format (--xmlformula)
[lola][I] reading XML formula
[lola][I] reading formula from LTLCardinality.xml
[lola][I] Rule S: 0 transitions removed,0 places removed
[lola][I] LAUNCH task # 10 (type EXCL) for 9 MedleyA-PT-18-LTLCardinality-03
[lola][I] time limit : 141 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 10 (type EXCL) for MedleyA-PT-18-LTLCardinality-03
[lola][I] result : false
[lola][I] markings : 26
[lola][I] fired transitions : 26
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 13 (type CNST) for 12 MedleyA-PT-18-LTLCardinality-04
[lola][I] time limit : 0 sec
[lola][I] memory limit: 0 pages
[lola][I] FINISHED task # 13 (type CNST) for MedleyA-PT-18-LTLCardinality-04
[lola][I] result : true
[lola][I] LAUNCH task # 16 (type EXCL) for 15 MedleyA-PT-18-LTLCardinality-05
[lola][I] time limit : 200 sec
[lola][I] memory limit: 2000 pages
[lola][I] LAUNCH task # 65 (type FNDP) for 24 MedleyA-PT-18-LTLCardinality-08
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 66 (type EQUN) for 24 MedleyA-PT-18-LTLCardinality-08
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 61 (type FNDP) for 24 MedleyA-PT-18-LTLCardinality-08
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 16 (type EXCL) for MedleyA-PT-18-LTLCardinality-05
[lola][I] result : false
[lola][I] markings : 26
[lola][I] fired transitions : 26
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 58 (type EXCL) for 57 MedleyA-PT-18-LTLCardinality-15
[lola][I] time limit : 212 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 65 (type FNDP) for MedleyA-PT-18-LTLCardinality-08
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
[lola][W] CANCELED task # 61 (type FNDP) for MedleyA-PT-18-LTLCardinality-08 (obsolete)
[lola][W] CANCELED task # 66 (type EQUN) for MedleyA-PT-18-LTLCardinality-08 (obsolete)
[lola][I] LAUNCH task # 69 (type FNDP) for 50 MedleyA-PT-18-LTLCardinality-14
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 70 (type EQUN) for 50 MedleyA-PT-18-LTLCardinality-14
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 58 (type EXCL) for MedleyA-PT-18-LTLCardinality-15
[lola][I] result : false
[lola][I] markings : 4975
[lola][I] fired transitions : 18903
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 43 (type EXCL) for 40 MedleyA-PT-18-LTLCardinality-12
[lola][I] time limit : 262 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 43 (type EXCL) for MedleyA-PT-18-LTLCardinality-12
[lola][I] result : true
[lola][I] markings : 2
[lola][I] fired transitions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 35 (type EXCL) for 34 MedleyA-PT-18-LTLCardinality-10
[lola][I] time limit : 283 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 35 (type EXCL) for MedleyA-PT-18-LTLCardinality-10
[lola][I] result : true
[lola][I] markings : 6
[lola][I] fired transitions : 5
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 32 (type EXCL) for 31 MedleyA-PT-18-LTLCardinality-09
[lola][I] time limit : 309 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 61 (type FNDP) for MedleyA-PT-18-LTLCardinality-08
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
[lola][I] FINISHED task # 32 (type EXCL) for MedleyA-PT-18-LTLCardinality-09
[lola][I] result : true
[lola][I] markings : 2
[lola][I] fired transitions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 45 (type EXCL) for 40 MedleyA-PT-18-LTLCardinality-12
[lola][I] time limit : 340 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 45 (type EXCL) for MedleyA-PT-18-LTLCardinality-12
[lola][I] result : false
[lola][I] markings : 26
[lola][I] fired transitions : 26
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 22 (type EXCL) for 21 MedleyA-PT-18-LTLCardinality-07
[lola][I] time limit : 378 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 22 (type EXCL) for MedleyA-PT-18-LTLCardinality-07
[lola][I] result : true
[lola][I] markings : 4
[lola][I] fired transitions : 3
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 19 (type EXCL) for 18 MedleyA-PT-18-LTLCardinality-06
[lola][I] time limit : 425 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 19 (type EXCL) for MedleyA-PT-18-LTLCardinality-06
[lola][I] result : true
[lola][I] markings : 2
[lola][I] fired transitions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 1 (type EXCL) for 0 MedleyA-PT-18-LTLCardinality-00
[lola][I] time limit : 486 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 1 (type EXCL) for MedleyA-PT-18-LTLCardinality-00
[lola][I] result : true
[lola][I] markings : 1
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 71 (type EXCL) for 50 MedleyA-PT-18-LTLCardinality-14
[lola][I] time limit : 567 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 69 (type FNDP) for MedleyA-PT-18-LTLCardinality-14
[lola][I] result : true
[lola][I] tried executions : 140
[lola][I] time used : 1
[lola][I] memory pages used : 0
[lola][W] CANCELED task # 70 (type EQUN) for MedleyA-PT-18-LTLCardinality-14 (obsolete)
[lola][W] CANCELED task # 71 (type EXCL) for MedleyA-PT-18-LTLCardinality-14 (obsolete)
[lola][I] LAUNCH task # 7 (type EXCL) for 6 MedleyA-PT-18-LTLCardinality-02
[lola][I] time limit : 851 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 66 (type EQUN) for MedleyA-PT-18-LTLCardinality-08
[lola][I] result : unknown
[lola][I] FINISHED task # 7 (type EXCL) for MedleyA-PT-18-LTLCardinality-02
[lola][I] result : false
[lola][I] markings : 2237
[lola][I] fired transitions : 4217
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 4 (type EXCL) for 3 MedleyA-PT-18-LTLCardinality-01
[lola][I] time limit : 1135 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 4 (type EXCL) for MedleyA-PT-18-LTLCardinality-01
[lola][I] result : false
[lola][I] markings : 6
[lola][I] fired transitions : 7
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 38 (type EXCL) for 37 MedleyA-PT-18-LTLCardinality-11
[lola][I] time limit : 1702 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 38 (type EXCL) for MedleyA-PT-18-LTLCardinality-11
[lola][I] result : false
[lola][I] markings : 6
[lola][I] fired transitions : 7
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 48 (type EXCL) for 47 MedleyA-PT-18-LTLCardinality-13
[lola][I] time limit : 3405 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 48 (type EXCL) for MedleyA-PT-18-LTLCardinality-13
[lola][I] result : true
[lola][I] markings : 1
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] Portfolio finished: no open formulas

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="MedleyA-PT-18"
export BK_EXAMINATION="LTLCardinality"
export BK_TOOL="lola"
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 2-5568"
echo " Executing tool lola"
echo " Input is MedleyA-PT-18, examination is LTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r577-smll-171734920500139"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/MedleyA-PT-18.tgz
mv MedleyA-PT-18 execution
cd execution
if [ "LTLCardinality" = "ReachabilityDeadlock" ] || [ "LTLCardinality" = "UpperBounds" ] || [ "LTLCardinality" = "QuasiLiveness" ] || [ "LTLCardinality" = "StableMarking" ] || [ "LTLCardinality" = "Liveness" ] || [ "LTLCardinality" = "OneSafe" ] || [ "LTLCardinality" = "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 [ "LTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLCardinality" != "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 "LTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property LTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "LTLCardinality.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 '' LTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "LTLCardinality" = "ReachabilityDeadlock" ] || [ "LTLCardinality" = "QuasiLiveness" ] || [ "LTLCardinality" = "StableMarking" ] || [ "LTLCardinality" = "Liveness" ] || [ "LTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME LTLCardinality"
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 ;