About the Execution of ITS-Tools for DNAwalker-PT-03track12BlockBoth
Execution Summary | |||||
Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
260.790 | 2767.00 | 3612.00 | 141.70 | FFFTTFFTTFTFFTFT | normal |
Execution Chart
We display below the execution chart for this examination (boot time has been removed).
Trace from the execution
Waiting for the VM to be ready (probing ssh)
......
=====================================================================
Generated by BenchKit 2-3254
Executing tool itstools
Input is DNAwalker-PT-03track12BlockBoth, examination is LTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r030-blw3-149440266400023
=====================================================================
--------------------
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 DNAwalker-PT-03track12BlockBoth-LTLCardinality-0
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-1
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-10
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-11
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-12
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-13
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-14
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-15
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-2
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-3
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-4
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-5
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-6
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-7
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-8
FORMULA_NAME DNAwalker-PT-03track12BlockBoth-LTLCardinality-9
=== Now, execution of the tool begins
BK_START 1496243303221
Using solver YICES2 to compute partial order matrices.
Built C files in :
/home/mcc/execution
its-ltl command run as :
/home/mcc/BenchKit/eclipse/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201705302212/bin/its-ltl-linux64 --gc-threshold 2000000 -i /home/mcc/execution/LTLCardinality.pnml.gal -t CGAL -LTL /home/mcc/execution/LTLCardinality.ltl -c -stutter-deadlock
Read 16 LTL properties
Checking formula 0 : !((F(G("A11<=A2"))))
Formula 0 simplified : !FG"A11<=A2"
Presburger conditions satisfied. Using coverability to approximate state space in K-Induction.
// Phase 1: matrix 84 rows 14 cols
2 unique states visited
2 strongly connected components in search stack
2 transitions explored
2 items max in DFS search stack
13 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.151693,28120,1,0,345,26943,191,173,981,29829,401
an accepting run exists (use option '-e' to print it)
Formula 0 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-0 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 1 : !((G(X(("A2>=3")U("A10>=2")))))
Formula 1 simplified : !GX("A2>=3" U "A10>=2")
16 unique states visited
16 strongly connected components in search stack
17 transitions explored
16 items max in DFS search stack
1 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.170824,29316,1,0,348,28787,207,202,1013,34150,487
an accepting run exists (use option '-e' to print it)
Formula 1 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-1 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 2 : !(("B5<=A7"))
Formula 2 simplified : !"B5<=A7"
1 unique states visited
0 strongly connected components in search stack
0 transitions explored
1 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.171171,29316,1,0,348,28787,210,202,1016,34150,489
no accepting run found
Formula 2 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-2 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 3 : !((G(X(("A1<=A7")U("B9<=A6")))))
Formula 3 simplified : !GX("A1<=A7" U "B9<=A6")
15 unique states visited
15 strongly connected components in search stack
16 transitions explored
15 items max in DFS search stack
1 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.17264,29344,1,0,350,28879,222,203,1031,34304,501
an accepting run exists (use option '-e' to print it)
Formula 3 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-3 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 4 : !((X("A7>=1")))
Formula 4 simplified : !X"A7>=1"
2 unique states visited
0 strongly connected components in search stack
1 transitions explored
2 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.172918,29344,1,0,350,28879,225,203,1032,34304,503
no accepting run found
Formula 4 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-4 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 5 : !((G(X("A6<=A9"))))
Formula 5 simplified : !GX"A6<=A9"
4 unique states visited
4 strongly connected components in search stack
4 transitions explored
4 items max in DFS search stack
2 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.197379,30288,1,0,387,34187,231,237,1039,39574,585
an accepting run exists (use option '-e' to print it)
Formula 5 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-5 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 6 : !((F(("A8>=2")U(G("B5<=A3")))))
Formula 6 simplified : !F("A8>=2" U G"B5<=A3")
2 unique states visited
2 strongly connected components in search stack
2 transitions explored
2 items max in DFS search stack
9 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.289417,33520,1,0,466,48938,244,317,1044,59197,804
an accepting run exists (use option '-e' to print it)
Formula 6 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-6 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 7 : !((X("A7<=A10")))
Formula 7 simplified : !X"A7<=A10"
2 unique states visited
0 strongly connected components in search stack
1 transitions explored
2 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.289893,33524,1,0,466,48938,247,317,1048,59197,806
no accepting run found
Formula 7 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-7 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 8 : !(("A1<=B9"))
Formula 8 simplified : !"A1<=B9"
3 unique states visited
3 strongly connected components in search stack
3 transitions explored
3 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.291705,33784,1,0,466,49000,250,317,1051,59330,811
an accepting run exists (use option '-e' to print it)
Formula 8 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-8 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 9 : !((X(F("A1<=A12"))))
Formula 9 simplified : !XF"A1<=A12"
2 unique states visited
0 strongly connected components in search stack
1 transitions explored
2 items max in DFS search stack
1 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.292947,33824,1,0,474,49089,259,323,1054,59558,832
no accepting run found
Formula 9 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-9 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 10 : !(((F("A3<=A8"))U(X(G("A8<=A1")))))
Formula 10 simplified : !(F"A3<=A8" U XG"A8<=A1")
13 unique states visited
8 strongly connected components in search stack
13 transitions explored
8 items max in DFS search stack
3 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.327873,35140,1,0,492,52560,277,342,1065,62970,932
an accepting run exists (use option '-e' to print it)
Formula 10 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-10 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 11 : !((F("A12<=B9")))
Formula 11 simplified : !F"A12<=B9"
1 unique states visited
0 strongly connected components in search stack
0 transitions explored
1 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.3284,35212,1,0,492,52560,286,342,1068,62970,936
no accepting run found
Formula 11 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-11 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 12 : !((F("A4>=1")))
Formula 12 simplified : !F"A4>=1"
1 unique states visited
0 strongly connected components in search stack
0 transitions explored
1 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.328771,35408,1,0,492,52560,295,342,1069,62970,940
no accepting run found
Formula 12 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-12 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 13 : !((G(F(G(X("B5>=3"))))))
Formula 13 simplified : !GFGX"B5>=3"
14 unique states visited
13 strongly connected components in search stack
15 transitions explored
14 items max in DFS search stack
0 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.331931,35500,1,0,492,52842,300,353,1071,64110,976
an accepting run exists (use option '-e' to print it)
Formula 13 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-13 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 14 : !((F((G("A1<=A12"))U(G("B9>=1")))))
Formula 14 simplified : !F(G"A1<=A12" U G"B9>=1")
2 unique states visited
2 strongly connected components in search stack
2 transitions explored
2 items max in DFS search stack
1 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.350948,36016,1,0,570,55800,313,441,1072,68842,1209
an accepting run exists (use option '-e' to print it)
Formula 14 is FALSE accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-14 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Checking formula 15 : !((G(X(F(F("A11<=A8"))))))
Formula 15 simplified : !GXF"A11<=A8"
25 unique states visited
0 strongly connected components in search stack
26 transitions explored
14 items max in DFS search stack
1 ticks for the emptiness check
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
STATS,0,0.360875,36412,1,0,617,57156,322,476,1078,70512,1377
no accepting run found
Formula 15 is TRUE no accepting run found.
FORMULA DNAwalker-PT-03track12BlockBoth-LTLCardinality-15 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL
Exit code :0
BK_STOP 1496243305988
--------------------
content from stderr:
+ export BINDIR=/home/mcc/BenchKit/
+ BINDIR=/home/mcc/BenchKit/
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ LTLCardinality = StateSpace ]]
+ /home/mcc/BenchKit//runeclipse.sh /home/mcc/execution LTLCardinality -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -smt
+ ulimit -s 65536
+ java -Dosgi.requiredJavaVersion=1.6 -Xss8m -Xms40m -Xmx8192m -Declipse.pde.launch=true -Dfile.encoding=UTF-8 -classpath /home/mcc/BenchKit//eclipse/plugins/org.eclipse.equinox.launcher_1.3.201.v20161025-1711.jar org.eclipse.equinox.launcher.Main -application fr.lip6.move.gal.application.pnmcc -data /home/mcc/BenchKit//workspace -os linux -ws gtk -arch x86_64 -nl en_US -consoleLog -pnfolder /home/mcc/execution -examination LTLCardinality -yices2path /home/mcc/BenchKit//yices/bin/yices -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -smt
May 31, 2017 3:08:24 PM fr.lip6.move.gal.application.MccTranslator transformPNML
INFO: Parsing pnml file : /home/mcc/execution/model.pnml
May 31, 2017 3:08:24 PM fr.lip6.move.gal.nupn.PTNetReader loadFromXML
INFO: Load time of PNML (sax parser for PT used): 48 ms
May 31, 2017 3:08:24 PM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 14 places.
May 31, 2017 3:08:24 PM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 84 transitions.
May 31, 2017 3:08:25 PM fr.lip6.move.gal.instantiate.GALRewriter flatten
INFO: Flatten gal took : 54 ms
May 31, 2017 3:08:25 PM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /home/mcc/execution/LTLCardinality.pnml.gal : 9 ms
May 31, 2017 3:08:25 PM fr.lip6.move.serialization.SerializationUtil serializePropertiesForITSLTLTools
INFO: Time to serialize properties into /home/mcc/execution/LTLCardinality.ltl : 0 ms
May 31, 2017 3:08:25 PM fr.lip6.move.gal.gal2smt.bmc.KInductionSolver computeAndDeclareInvariants
INFO: Computed 0 place invariants in 8 ms
May 31, 2017 3:08:25 PM fr.lip6.move.gal.gal2smt.bmc.KInductionSolver init
INFO: Proved 14 variables to be positive in 28 ms
May 31, 2017 3:08:25 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver computeAblingMatrix
INFO: Computing symmetric may disable matrix : 84 transitions.
May 31, 2017 3:08:25 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver printStats
INFO: Computation of Completed :0/84 took 2 ms. Total solver calls (SAT/UNSAT): 3(0/3)
May 31, 2017 3:08:25 PM fr.lip6.move.gal.itstools.Runner runTool
INFO: Standard error output from running tool CommandLine [args=[/home/mcc/BenchKit/eclipse/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201705302212/bin/its-ltl-linux64, --gc-threshold, 2000000, -i, /home/mcc/execution/LTLCardinality.pnml.gal, -t, CGAL, -LTL, /home/mcc/execution/LTLCardinality.ltl, -c, -stutter-deadlock], workingDir=/home/mcc/execution]
Reverse transition relation is NOT exact ! Due to transitions tb5, tAb5, tb9, tAb9, t1_2, t1_3, t1_4, t1_5, t1_9, t2_3, t2_4, t2_5, t2_6, t2_9, t2_10, t3_2, t3_4, t3_5, t3_6, t3_7, t3_9, t3_10, t3_11, t4_2, t4_3, t4_5, t4_6, t4_7, t4_9, t4_10, t4_11, t5_2, t5_3, t5_4, t5_6, t5_7, t5_8, t5_9, t5_10, t5_11, t6_2, t6_3, t6_4, t6_5, t6_8, t6_9, t6_10, t7_3, t7_4, t7_5, t7_9, t9_2, t9_3, t9_4, t9_5, t9_6, t9_7, t9_10, t9_11, t9_12, t10_2, t10_3, t10_4, t10_5, t10_6, t10_9, t10_12, t11_3, t11_4, t11_5, t11_9, Intersection with reachable at each step enabled. (destroyed/reverse/intersect/total) :5/8/71/84
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
Computing Next relation with stutter on 6 deadlock states
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="DNAwalker-PT-03track12BlockBoth"
export BK_EXAMINATION="LTLCardinality"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"
# 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
tar xzf /home/mcc/BenchKit/INPUTS/DNAwalker-PT-03track12BlockBoth.tgz
mv DNAwalker-PT-03track12BlockBoth execution
# this is for BenchKit: explicit launching of the test
cd execution
echo "====================================================================="
echo " Generated by BenchKit 2-3254"
echo " Executing tool itstools"
echo " Input is DNAwalker-PT-03track12BlockBoth, 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 r030-blw3-149440266400023"
echo "====================================================================="
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 '
echo "FORMULA_NAME $x"
done
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 ;