fond
Model Checking Contest 2024
14th edition, Geneva, Switzerland, June 25, 2024
Execution of r357-tall-171683763600551
Last Updated
July 7, 2024

About the Execution of LoLA for ShieldPPPt-PT-002A

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
86.527 806.00 1175.00 42.30 ?FTFTFTFTTTTFTTT 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.r357-tall-171683763600551.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 ShieldPPPt-PT-002A, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r357-tall-171683763600551
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 536K
-rw-r--r-- 1 mcc users 5.8K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 59K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 4.9K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 46K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 18 16:43 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K May 18 16:43 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.2K Apr 23 07:54 LTLCardinality.txt
-rw-r--r-- 1 mcc users 22K Apr 23 07:54 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Apr 23 07:54 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Apr 23 07:54 LTLFireability.xml
-rw-r--r-- 1 mcc users 15K Apr 11 14:35 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 178K Apr 11 14:35 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Apr 11 14:34 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 99K Apr 11 14:34 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Apr 23 07:54 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 23 07:54 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 5 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 14K May 18 16:43 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-002A-ReachabilityFireability-2024-00
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-01
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-02
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-03
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-04
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-05
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-06
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-07
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-08
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-09
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-10
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-11
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-12
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-13
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-14
FORMULA_NAME ShieldPPPt-PT-002A-ReachabilityFireability-2024-15

=== Now, execution of the tool begins

BK_START 1717151390177

FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-07 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-02 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-08 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-05 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-03 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-04 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-13 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-15 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-11 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-12 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-09 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-14 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-01 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-10 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT
FORMULA ShieldPPPt-PT-002A-ReachabilityFireability-2024-06 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT TOPOLOGICAL STATE_COMPRESSION STUBBORN_SETS USE_NUPN UNFOLDING_TO_PT

BK_STOP 1717151390983

--------------------
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 ReachabilityFireability.xml
[lola][I] Rule S: 0 transitions removed,0 places removed
[lola][I] LAUNCH task # 22 (type CNST) for 21 ShieldPPPt-PT-002A-ReachabilityFireability-2024-07
[lola][I] time limit : 0 sec
[lola][I] memory limit: 0 pages
[lola][I] LAUNCH task # 50 (type EXCL) for 6 ShieldPPPt-PT-002A-ReachabilityFireability-2024-02
[lola][I] time limit : 171 sec
[lola][I] memory limit: 2000 pages
[lola][I] LAUNCH task # 48 (type FNDP) for 6 ShieldPPPt-PT-002A-ReachabilityFireability-2024-02
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 49 (type EQUN) for 6 ShieldPPPt-PT-002A-ReachabilityFireability-2024-02
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 22 (type CNST) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-07
[lola][I] result : false
[lola][I] FINISHED task # 48 (type FNDP) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-02
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
[lola][W] CANCELED task # 49 (type EQUN) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-02 (obsolete)
[lola][W] CANCELED task # 50 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-02 (obsolete)
[lola][I] LAUNCH task # 25 (type CNST) for 24 ShieldPPPt-PT-002A-ReachabilityFireability-2024-08
[lola][I] time limit : 0 sec
[lola][I] memory limit: 0 pages
[lola][I] FINISHED task # 25 (type CNST) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-08
[lola][I] result : true
[lola][I] LAUNCH task # 10 (type CNST) for 9 ShieldPPPt-PT-002A-ReachabilityFireability-2024-03
[lola][I] time limit : 0 sec
[lola][I] memory limit: 0 pages
[lola][I] LAUNCH task # 53 (type EXCL) for 12 ShieldPPPt-PT-002A-ReachabilityFireability-2024-04
[lola][I] time limit : 300 sec
[lola][I] memory limit: 2000 pages
[lola][I] LAUNCH task # 51 (type FNDP) for 12 ShieldPPPt-PT-002A-ReachabilityFireability-2024-04
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 52 (type EQUN) for 12 ShieldPPPt-PT-002A-ReachabilityFireability-2024-04
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 16 (type CNST) for 15 ShieldPPPt-PT-002A-ReachabilityFireability-2024-05
[lola][I] time limit : 0 sec
[lola][I] memory limit: 0 pages
[lola][I] FINISHED task # 16 (type CNST) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-05
[lola][I] result : false
[lola][I] FINISHED task # 10 (type CNST) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-03
[lola][I] result : false
[lola][I] LAUNCH task # 59 (type FNDP) for 18 ShieldPPPt-PT-002A-ReachabilityFireability-2024-06
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 53 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-04
[lola][I] result : true
[lola][I] markings : 17
[lola][I] fired transitions : 16
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][W] CANCELED task # 51 (type FNDP) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-04 (obsolete)
[lola][W] CANCELED task # 52 (type EQUN) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-04 (obsolete)
[lola][I] LAUNCH task # 74 (type EXCL) for 39 ShieldPPPt-PT-002A-ReachabilityFireability-2024-13
[lola][I] time limit : 450 sec
[lola][I] memory limit: 2000 pages
[lola][I] LAUNCH task # 75 (type FNDP) for 36 ShieldPPPt-PT-002A-ReachabilityFireability-2024-12
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 76 (type EQUN) for 36 ShieldPPPt-PT-002A-ReachabilityFireability-2024-12
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 74 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-13
[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 # 84 (type EXCL) for 45 ShieldPPPt-PT-002A-ReachabilityFireability-2024-15
[lola][I] time limit : 400 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 84 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-15
[lola][I] result : true
[lola][I] markings : 7
[lola][I] fired transitions : 6
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 72 (type EXCL) for 33 ShieldPPPt-PT-002A-ReachabilityFireability-2024-11
[lola][I] time limit : 450 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 72 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-11
[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 # 56 (type EXCL) for 27 ShieldPPPt-PT-002A-ReachabilityFireability-2024-09
[lola][I] time limit : 514 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 75 (type FNDP) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-12
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
[lola][W] CANCELED task # 76 (type EQUN) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-12 (obsolete)
[lola][I] LAUNCH task # 58 (type FNDP) for 42 ShieldPPPt-PT-002A-ReachabilityFireability-2024-14
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 63 (type EQUN) for 42 ShieldPPPt-PT-002A-ReachabilityFireability-2024-14
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 56 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-09
[lola][I] result : true
[lola][I] markings : 12
[lola][I] fired transitions : 11
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 86 (type EXCL) for 3 ShieldPPPt-PT-002A-ReachabilityFireability-2024-01
[lola][I] time limit : 720 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 58 (type FNDP) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-14
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
[lola][W] CANCELED task # 63 (type EQUN) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-14 (obsolete)
[lola][I] LAUNCH task # 69 (type FNDP) for 0 ShieldPPPt-PT-002A-ReachabilityFireability-2024-00
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] LAUNCH task # 80 (type EQUN) for 0 ShieldPPPt-PT-002A-ReachabilityFireability-2024-00
[lola][I] time limit : 32000000 sec
[lola][I] memory limit: 5 pages
[lola][I] FINISHED task # 51 (type FNDP) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-04
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
[lola][I] FINISHED task # 86 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-01
[lola][I] result : true
[lola][I] markings : 2804
[lola][I] fired transitions : 3368
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 79 (type EXCL) for 30 ShieldPPPt-PT-002A-ReachabilityFireability-2024-10
[lola][I] time limit : 1200 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 79 (type EXCL) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-10
[lola][I] result : true
[lola][I] time used : 0
[lola][I] memory pages used : 1
[lola][I] LAUNCH task # 81 (type EXCL) for 0 ShieldPPPt-PT-002A-ReachabilityFireability-2024-00
[lola][I] time limit : 1800 sec
[lola][I] memory limit: 2000 pages
[lola][I] FINISHED task # 59 (type FNDP) for ShieldPPPt-PT-002A-ReachabilityFireability-2024-06
[lola][I] result : true
[lola][I] tried executions : 1
[lola][I] time used : 0
[lola][I] memory pages used : 0
/home/mcc/BenchKit/BenchKit_head.sh: line 23: 406 Segmentation fault $BK_TOOL --conf=/home/mcc/BenchKit/bin/myconf --formula=$BK_EXAMINATION.xml $LOLA_TIMELIMIT $LOLA_MEMLIMIT 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="ShieldPPPt-PT-002A"
export BK_EXAMINATION="ReachabilityFireability"
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 ShieldPPPt-PT-002A, 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 r357-tall-171683763600551"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/ShieldPPPt-PT-002A.tgz
mv ShieldPPPt-PT-002A 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 ;