Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2022-input.r067-tall-165254778000138.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2022-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.......................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is DLCround-PT-09b, examination is StableMarking
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r067-tall-165254778000138
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 1.6M
-rw-r--r-- 1 mcc users 8.3K Apr 30 07:53 CTLCardinality.txt
-rw-r--r-- 1 mcc users 94K Apr 30 07:53 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.3K Apr 30 07:52 CTLFireability.txt
-rw-r--r-- 1 mcc users 58K Apr 30 07:52 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 10 09:33 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.6K May 9 07:28 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K May 9 07:28 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K May 9 07:28 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K May 9 07:28 LTLFireability.xml
-rw-r--r-- 1 mcc users 1.6K May 9 07:28 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K May 9 07:28 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:33 equiv_col
-rw-r--r-- 1 mcc users 4 May 10 09:33 instance
-rw-r--r-- 1 mcc users 6 May 10 09:33 iscolored
-rw-r--r-- 1 mcc users 1.3M May 10 09:33 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

FORMULA_NAME StableMarking

=== Now, execution of the tool begins

BK_START 1652566357970

Running Version 202205111006
[2022-05-14 22:12:39] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, StableMarking, -spotpath, /home/mcc/BenchKit/bin//..//ltlfilt, -z3path, /home/mcc/BenchKit/bin//..//z3/bin/z3, -yices2path, /home/mcc/BenchKit/bin//..//yices/bin/yices, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 1800]
[2022-05-14 22:12:39] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-05-14 22:12:39] [INFO ] Load time of PNML (sax parser for PT used): 239 ms
[2022-05-14 22:12:39] [INFO ] Transformed 3495 places.
[2022-05-14 22:12:39] [INFO ] Transformed 5439 transitions.
[2022-05-14 22:12:39] [INFO ] Found NUPN structural information;
[2022-05-14 22:12:39] [INFO ] Parsed PT model containing 3495 places and 5439 transitions in 418 ms.
Graph (trivial) has 3246 edges and 3495 vertex of which 624 / 3495 are part of one of the 44 SCC in 16 ms
Free SCC test removed 580 places
Structural test allowed to assert that 2165 places are NOT stable. Took 52 ms.
Ensure Unique test removed 604 transitions
Reduce redundant transitions removed 604 transitions.
Incomplete random walk after 10000 steps, including 2 resets, run finished after 1014 ms. (steps per millisecond=9 ) properties (out of 1330) seen :997
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 5 ms. (steps per millisecond=20 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 5 ms. (steps per millisecond=20 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 5 ms. (steps per millisecond=20 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=25 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 100 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Incomplete Best-First random walk after 101 steps, including 2 resets, run finished after 3 ms. (steps per millisecond=33 ) properties (out of 333) seen :0
Running SMT prover for 333 properties.
[2022-05-14 22:12:41] [INFO ] Flow matrix only has 4792 transitions (discarded 43 similar events)
// Phase 1: matrix 4792 rows 2915 cols
[2022-05-14 22:12:41] [INFO ] Computed 184 place invariants in 38 ms
[2022-05-14 22:12:57] [INFO ] After 15863ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:333
[2022-05-14 22:13:11] [INFO ] [Nat]Absence check using 184 positive place invariants in 146 ms returned sat
[2022-05-14 22:13:22] [WARNING] SMT solver failed with error :SMT solver raised an error when submitting script.... while checking expressions.
[2022-05-14 22:13:22] [INFO ] After 25037ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :0 real:333
Fused 333 Parikh solutions to 1 different solutions.
Parikh walk visited 0 properties in 1 ms.
Support contains 333 out of 2915 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 2915/2915 places, 4835/4835 transitions.
Drop transitions removed 44 transitions
Reduce isomorphic transitions removed 44 transitions.
Drop transitions removed 1080 transitions
Trivial Post-agglo rules discarded 1080 transitions
Performed 1080 trivial Post agglomeration. Transition count delta: 1080
Iterating post reduction 0 with 1124 rules applied. Total rules applied 1124 place count 2915 transition count 3711
Reduce places removed 1080 places and 0 transitions.
Ensure Unique test removed 30 transitions
Reduce isomorphic transitions removed 30 transitions.
Drop transitions removed 22 transitions
Trivial Post-agglo rules discarded 22 transitions
Performed 22 trivial Post agglomeration. Transition count delta: 22
Iterating post reduction 1 with 1132 rules applied. Total rules applied 2256 place count 1835 transition count 3659
Reduce places removed 22 places and 0 transitions.
Iterating post reduction 2 with 22 rules applied. Total rules applied 2278 place count 1813 transition count 3659
Performed 8 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 8 Pre rules applied. Total rules applied 2278 place count 1813 transition count 3651
Deduced a syphon composed of 8 places in 19 ms
Reduce places removed 8 places and 0 transitions.
Iterating global reduction 3 with 16 rules applied. Total rules applied 2294 place count 1805 transition count 3651
Discarding 329 places :
Symmetric choice reduction at 3 with 329 rule applications. Total rules 2623 place count 1476 transition count 3322
Iterating global reduction 3 with 329 rules applied. Total rules applied 2952 place count 1476 transition count 3322
Performed 127 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 127 Pre rules applied. Total rules applied 2952 place count 1476 transition count 3195
Deduced a syphon composed of 127 places in 19 ms
Reduce places removed 127 places and 0 transitions.
Iterating global reduction 3 with 254 rules applied. Total rules applied 3206 place count 1349 transition count 3195
Discarding 59 places :
Symmetric choice reduction at 3 with 59 rule applications. Total rules 3265 place count 1290 transition count 2446
Iterating global reduction 3 with 59 rules applied. Total rules applied 3324 place count 1290 transition count 2446
Ensure Unique test removed 24 transitions
Reduce isomorphic transitions removed 24 transitions.
Iterating post reduction 3 with 24 rules applied. Total rules applied 3348 place count 1290 transition count 2422
Performed 300 Post agglomeration using F-continuation condition with reduction of 4 identical transitions.
Deduced a syphon composed of 300 places in 1 ms
Reduce places removed 300 places and 0 transitions.
Iterating global reduction 4 with 600 rules applied. Total rules applied 3948 place count 990 transition count 2118
Ensure Unique test removed 9 transitions
Reduce isomorphic transitions removed 9 transitions.
Iterating post reduction 4 with 9 rules applied. Total rules applied 3957 place count 990 transition count 2109
Renaming transitions due to excessive name length > 1024 char.
Performed 33 Post agglomeration using F-continuation condition.Transition count delta: -326
Deduced a syphon composed of 33 places in 1 ms
Reduce places removed 33 places and 0 transitions.
Iterating global reduction 5 with 66 rules applied. Total rules applied 4023 place count 957 transition count 2435
Discarding 12 places :
Symmetric choice reduction at 5 with 12 rule applications. Total rules 4035 place count 945 transition count 2123
Iterating global reduction 5 with 12 rules applied. Total rules applied 4047 place count 945 transition count 2123
Ensure Unique test removed 12 transitions
Reduce isomorphic transitions removed 12 transitions.
Iterating post reduction 5 with 12 rules applied. Total rules applied 4059 place count 945 transition count 2111
Drop transitions removed 166 transitions
Redundant transition composition rules discarded 166 transitions
Iterating global reduction 6 with 166 rules applied. Total rules applied 4225 place count 945 transition count 1945
Discarding 10 places :
Symmetric choice reduction at 6 with 10 rule applications. Total rules 4235 place count 935 transition count 1815
Iterating global reduction 6 with 10 rules applied. Total rules applied 4245 place count 935 transition count 1815
Ensure Unique test removed 10 transitions
Reduce isomorphic transitions removed 10 transitions.
Iterating post reduction 6 with 10 rules applied. Total rules applied 4255 place count 935 transition count 1805
Free-agglomeration rule applied 385 times with reduction of 128 identical transitions.
Iterating global reduction 7 with 385 rules applied. Total rules applied 4640 place count 935 transition count 1292
Reduce places removed 385 places and 0 transitions.
Drop transitions removed 239 transitions
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 241 transitions.
Graph (complete) has 1442 edges and 550 vertex of which 543 are kept as prefixes of interest. Removing 7 places using SCC suffix rule.19 ms
Discarding 7 places :
Also discarding 0 output transitions
Iterating post reduction 7 with 627 rules applied. Total rules applied 5267 place count 543 transition count 1051
Discarding 59 places :
Symmetric choice reduction at 8 with 59 rule applications. Total rules 5326 place count 484 transition count 907
Iterating global reduction 8 with 59 rules applied. Total rules applied 5385 place count 484 transition count 907
Drop transitions removed 31 transitions
Redundant transition composition rules discarded 31 transitions
Iterating global reduction 8 with 31 rules applied. Total rules applied 5416 place count 484 transition count 876
Partial Free-agglomeration rule applied 2 times.
Drop transitions removed 2 transitions
Iterating global reduction 8 with 2 rules applied. Total rules applied 5418 place count 484 transition count 876
Partial Post-agglomeration rule applied 1 times.
Drop transitions removed 1 transitions
Iterating global reduction 8 with 1 rules applied. Total rules applied 5419 place count 484 transition count 876
Applied a total of 5419 rules in 1017 ms. Remains 484 /2915 variables (removed 2431) and now considering 876/4835 (removed 3959) transitions.
Finished structural reductions, in 1 iterations. Remains : 484/2915 places, 876/4835 transitions.
Finished random walk after 12852 steps, including 0 resets, run visited all 333 properties in 318 ms. (steps per millisecond=40 )
Able to resolve query StableMarking after proving 1332 properties.
FORMULA StableMarking FALSE TECHNIQUES RANDOM_WALK MARKED_SUFFIX_TEST TRIVIAL_UNMARKED_SCC_TEST TOPOLOGICAL
Total runtime 44489 ms.

BK_STOP 1652566403707

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

+ export LANG=C
+ LANG=C
+ export BINDIR=/home/mcc/BenchKit/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ StableMarking = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution StableMarking -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800
+ ulimit -s 65536
+ export PYTHONPATH=/usr/lib/python3.9/site-packages/
+ PYTHONPATH=/usr/lib/python3.9/site-packages/
+ export LD_LIBRARY_PATH=/usr/local/lib:
+ LD_LIBRARY_PATH=/usr/local/lib:
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202205111006.jar
+ VERSION=202205111006
+ echo 'Running Version 202205111006'
+ /home/mcc/BenchKit/bin//..//itstools/its-tools -data @none -pnfolder /home/mcc/execution -examination StableMarking -spotpath /home/mcc/BenchKit/bin//..//ltlfilt -z3path /home/mcc/BenchKit/bin//..//z3/bin/z3 -yices2path /home/mcc/BenchKit/bin//..//yices/bin/yices -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800 -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=@none -Xss128m -Xms40m -Xmx8192m

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="DLCround-PT-09b"
export BK_EXAMINATION="StableMarking"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
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 2-4028"
echo " Executing tool itstools"
echo " Input is DLCround-PT-09b, examination is StableMarking"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r067-tall-165254778000138"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/DLCround-PT-09b.tgz
mv DLCround-PT-09b execution
cd execution
if [ "StableMarking" = "ReachabilityDeadlock" ] || [ "StableMarking" = "UpperBounds" ] || [ "StableMarking" = "QuasiLiveness" ] || [ "StableMarking" = "StableMarking" ] || [ "StableMarking" = "Liveness" ] || [ "StableMarking" = "OneSafe" ] || [ "StableMarking" = "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 [ "StableMarking" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "StableMarking" != "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 "StableMarking.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property StableMarking.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "StableMarking.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 '' StableMarking.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "StableMarking" = "ReachabilityDeadlock" ] || [ "StableMarking" = "QuasiLiveness" ] || [ "StableMarking" = "StableMarking" ] || [ "StableMarking" = "Liveness" ] || [ "StableMarking" = "OneSafe" ] ; then
echo "FORMULA_NAME StableMarking"
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 ;