About the Execution of LTSMin+red for JoinFreeModules-PT-0100
Execution Summary | |||||
Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
318.231 | 71622.00 | 105866.00 | 338.80 | T | normal |
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.r247-tall-167856434000117.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 ltsminxred
Input is JoinFreeModules-PT-0100, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r247-tall-167856434000117
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 716K
-rw-r--r-- 1 mcc users 7.5K Feb 25 11:55 CTLCardinality.txt
-rw-r--r-- 1 mcc users 79K Feb 25 11:55 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.0K Feb 25 11:55 CTLFireability.txt
-rw-r--r-- 1 mcc users 57K Feb 25 11:55 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.8K Feb 25 16:18 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 16:18 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 16:18 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 16:18 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.1K Feb 25 11:55 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 90K Feb 25 11:55 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.3K Feb 25 11:55 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 60K Feb 25 11:55 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 16:18 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 16:18 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 304K Mar 5 18:22 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 QuasiLiveness
=== Now, execution of the tool begins
BK_START 1678711113030
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=ltsminxred
BK_EXAMINATION=QuasiLiveness
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=JoinFreeModules-PT-0100
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-13 12:38:34] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, QuasiLiveness, -timeout, 180, -rebuildPNML]
[2023-03-13 12:38:34] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-13 12:38:34] [INFO ] Load time of PNML (sax parser for PT used): 87 ms
[2023-03-13 12:38:34] [INFO ] Transformed 501 places.
[2023-03-13 12:38:34] [INFO ] Transformed 801 transitions.
[2023-03-13 12:38:34] [INFO ] Parsed PT model containing 501 places and 801 transitions and 2302 arcs in 149 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 501/501 places, 801/801 transitions.
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 1 place count 500 transition count 801
Applied a total of 1 rules in 22 ms. Remains 500 /501 variables (removed 1) and now considering 801/801 (removed 0) transitions.
// Phase 1: matrix 801 rows 500 cols
[2023-03-13 12:38:34] [INFO ] Computed 100 place invariants in 25 ms
[2023-03-13 12:38:35] [INFO ] Dead Transitions using invariants and state equation in 734 ms found 0 transitions.
[2023-03-13 12:38:35] [INFO ] Invariant cache hit.
[2023-03-13 12:38:35] [INFO ] Implicit Places using invariants in 84 ms returned []
[2023-03-13 12:38:35] [INFO ] Invariant cache hit.
[2023-03-13 12:38:35] [INFO ] State equation strengthened by 100 read => feed constraints.
[2023-03-13 12:38:35] [INFO ] Implicit Places using invariants and state equation in 263 ms returned []
Implicit Place search using SMT with State Equation took 350 ms to find 0 implicit places.
[2023-03-13 12:38:35] [INFO ] Invariant cache hit.
[2023-03-13 12:38:36] [INFO ] Dead Transitions using invariants and state equation in 304 ms found 0 transitions.
Starting structural reductions in LIVENESS mode, iteration 1 : 500/501 places, 801/801 transitions.
Finished structural reductions in LIVENESS mode , in 1 iterations and 1437 ms. Remains : 500/501 places, 801/801 transitions.
Discarding 400 transitions out of 801. Remains 401
Initial state reduction rules removed 1 formulas.
Incomplete random walk after 10001 steps, including 2 resets, run finished after 122 ms. (steps per millisecond=81 ) properties (out of 400) seen :192
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 6 ms. (steps per millisecond=16 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 2 ms. (steps per millisecond=50 ) properties (out of 208) seen :0
Incomplete Best-First random walk after 101 steps, including 0 resets, run finished after 1 ms. (steps per millisecond=101 ) properties (out of 208) seen :0
Running SMT prover for 208 properties.
[2023-03-13 12:38:36] [INFO ] Invariant cache hit.
[2023-03-13 12:38:38] [INFO ] [Real]Absence check using 100 positive place invariants in 14 ms returned sat
[2023-03-13 12:38:47] [INFO ] After 10993ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:208
[2023-03-13 12:38:48] [INFO ] [Nat]Absence check using 100 positive place invariants in 17 ms returned sat
[2023-03-13 12:38:58] [INFO ] After 8018ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :208
[2023-03-13 12:38:58] [INFO ] State equation strengthened by 100 read => feed constraints.
[2023-03-13 12:39:12] [INFO ] After 13852ms SMT Verify possible using 100 Read/Feed constraints in natural domain returned unsat :0 sat :208
[2023-03-13 12:39:12] [INFO ] Deduced a trap composed of 3 places in 38 ms of which 4 ms to minimize.
java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Failed to assert expression: java.io.IOException: Stream close...
at fr.lip6.move.gal.structural.smt.SMTUtils.execAndCheckResult(SMTUtils.java:251)
at fr.lip6.move.gal.structural.smt.DeadlockTester.refineWithTraps(DeadlockTester.java:1255)
at fr.lip6.move.gal.structural.smt.DeadlockTester.refineResultsWithTraps(DeadlockTester.java:736)
at fr.lip6.move.gal.structural.smt.DeadlockTester.verifyPossible(DeadlockTester.java:656)
at fr.lip6.move.gal.structural.smt.DeadlockTester.testUnreachableWithSMTIncremental(DeadlockTester.java:350)
at fr.lip6.move.gal.structural.smt.DeadlockTester.testUnreachableWithSMT(DeadlockTester.java:223)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.applyReductions(ReachabilitySolver.java:95)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.applyReachabilitySolver(GlobalPropertySolver.java:724)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.solveProperty(GlobalPropertySolver.java:558)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.preSolveLiveness(GlobalPropertySolver.java:412)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.preStableMarking(GlobalPropertySolver.java:321)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.solveProperty(GlobalPropertySolver.java:294)
at fr.lip6.move.gal.application.Application.startNoEx(Application.java:386)
at fr.lip6.move.gal.application.Application.start(Application.java:178)
at fr.lip6.move.gal.itscl.application.Application.start(Application.java:45)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:136)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:402)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:596)
at org.eclipse.equinox.launcher.Main.run(Main.java:1467)
at org.eclipse.equinox.launcher.Main.main(Main.java:1440)
[2023-03-13 12:39:12] [WARNING] SMT solver failed with error :SMT solver raised an error when submitting script.... while checking expressions.
[2023-03-13 12:39:12] [INFO ] After 25027ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :0 real:208
Parikh walk visited 119 properties in 30888 ms.
Support contains 89 out of 500 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 500/500 places, 801/801 transitions.
Graph (complete) has 1200 edges and 500 vertex of which 195 are kept as prefixes of interest. Removing 305 places using SCC suffix rule.4 ms
Discarding 305 places :
Also discarding 488 output transitions
Drop transitions removed 488 transitions
Drop transitions removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 2 place count 195 transition count 312
Applied a total of 2 rules in 39 ms. Remains 195 /500 variables (removed 305) and now considering 312/801 (removed 489) transitions.
// Phase 1: matrix 312 rows 195 cols
[2023-03-13 12:39:43] [INFO ] Computed 39 place invariants in 2 ms
[2023-03-13 12:39:43] [INFO ] Dead Transitions using invariants and state equation in 199 ms found 0 transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 239 ms. Remains : 195/500 places, 312/801 transitions.
Finished random walk after 15344 steps, including 0 resets, run visited all 89 properties in 68 ms. (steps per millisecond=225 )
Able to resolve query QuasiLiveness after proving 401 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK PARIKH_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 69136 ms.
ITS solved all properties within timeout
BK_STOP 1678711184652
--------------------
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//
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
++ perl -pe 's/.*\.//g'
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination QuasiLiveness -timeout 180 -rebuildPNML
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="JoinFreeModules-PT-0100"
export BK_EXAMINATION="QuasiLiveness"
export BK_TOOL="ltsminxred"
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 2-5348"
echo " Executing tool ltsminxred"
echo " Input is JoinFreeModules-PT-0100, examination is QuasiLiveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r247-tall-167856434000117"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/JoinFreeModules-PT-0100.tgz
mv JoinFreeModules-PT-0100 execution
cd execution
if [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "UpperBounds" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] || [ "QuasiLiveness" = "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 [ "QuasiLiveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "QuasiLiveness" != "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 "QuasiLiveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property QuasiLiveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "QuasiLiveness.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
elif [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] ; then
echo "FORMULA_NAME QuasiLiveness"
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 ;