About the Execution of LTSMin+red for SieveSingleMsgMbox-PT-d2m04
Execution Summary | |||||
Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
955.655 | 217696.00 | 240114.00 | 160.80 | TFTTTFTTTTTFFTFT | normal |
Execution Chart
We display below the execution chart for this examination (boot time has been removed).
Trace from the execution
Formatting '/mnt/tpsp/fkordon/mcc2023-input.r425-tajo-167905978200454.qcow2', fmt=qcow2 size=4294967296 backing_file='/mnt/tpsp/fkordon/mcc2023-input.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
..................
=====================================================================
Generated by BenchKit 2-5348
Executing tool ltsminxred
Input is SieveSingleMsgMbox-PT-d2m04, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r425-tajo-167905978200454
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 1.6M
-rw-r--r-- 1 mcc users 7.9K Feb 26 10:29 CTLCardinality.txt
-rw-r--r-- 1 mcc users 87K Feb 26 10:29 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 26 10:28 CTLFireability.txt
-rw-r--r-- 1 mcc users 48K Feb 26 10:28 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.9K Feb 25 17:06 LTLCardinality.txt
-rw-r--r-- 1 mcc users 27K Feb 25 17:06 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K Feb 25 17:06 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 17:06 LTLFireability.xml
-rw-r--r-- 1 mcc users 17K Feb 26 10:32 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 186K Feb 26 10:32 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.6K Feb 26 10:30 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 83K Feb 26 10:30 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K Feb 25 17:06 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 17:06 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 1.1M Mar 5 18:23 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 SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-00
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-01
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-02
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-03
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-04
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-05
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-06
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-07
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-08
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-09
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-10
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-11
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-12
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-13
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-14
FORMULA_NAME SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-15
=== Now, execution of the tool begins
BK_START 1679317760558
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=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=SieveSingleMsgMbox-PT-d2m04
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-20 13:09:23] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2023-03-20 13:09:23] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-20 13:09:23] [INFO ] Load time of PNML (sax parser for PT used): 193 ms
[2023-03-20 13:09:23] [INFO ] Transformed 2398 places.
[2023-03-20 13:09:23] [INFO ] Transformed 1954 transitions.
[2023-03-20 13:09:23] [INFO ] Parsed PT model containing 2398 places and 1954 transitions and 7816 arcs in 347 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 21 ms.
Working with output stream class java.io.PrintStream
Deduced a syphon composed of 1984 places in 39 ms
Reduce places removed 1984 places and 0 transitions.
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-01 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-02 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-03 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-04 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-05 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-06 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-07 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-08 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-09 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-10 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-13 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-14 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-15 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 2210 resets, run finished after 326 ms. (steps per millisecond=30 ) properties (out of 2) seen :0
Incomplete Best-First random walk after 10001 steps, including 921 resets, run finished after 97 ms. (steps per millisecond=103 ) properties (out of 2) seen :0
Incomplete Best-First random walk after 10000 steps, including 917 resets, run finished after 92 ms. (steps per millisecond=108 ) properties (out of 2) seen :0
Probably explored full state space saw : 3601 states, properties seen :0
Probabilistic random walk after 9757 steps, saw 3601 distinct states, run finished after 143 ms. (steps per millisecond=68 ) properties seen :0
Explored full state space saw : 3601 states, properties seen :0
Exhaustive walk after 9757 steps, saw 3601 distinct states, run finished after 116 ms. (steps per millisecond=84 ) properties seen :0
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-12 FALSE TECHNIQUES TOPOLOGICAL EXHAUSTIVE_WALK
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-00 TRUE TECHNIQUES TOPOLOGICAL EXHAUSTIVE_WALK
All properties solved without resorting to model-checking.
Total runtime 1277 ms.
pnml2lts-sym model.pnml --lace-workers=4 --vset=lddmc --saturation=sat -rbs,w2W,ru,hf --sylvan-sizes=20,28,20,28 --invariant=/tmp/447/inv_0_ --invariant=/tmp/447/inv_1_ --invariant=/tmp/447/inv_2_ --invariant=/tmp/447/inv_3_ --invariant=/tmp/447/inv_4_ --invariant=/tmp/447/inv_5_ --invariant=/tmp/447/inv_6_ --invariant=/tmp/447/inv_7_ --invariant=/tmp/447/inv_8_ --invariant=/tmp/447/inv_9_ --invariant=/tmp/447/inv_10_ --invariant=/tmp/447/inv_11_ --invariant=/tmp/447/inv_12_ --invariant=/tmp/447/inv_13_ --invariant=/tmp/447/inv_14_ --invariant=/tmp/447/inv_15_ --inv-par
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-00 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-01 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-02 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-03 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-04 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-05 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-06 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-07 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-08 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-09 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-10 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-11 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-12 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-13 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-14 FALSE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
FORMULA SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-15 TRUE TECHNIQUES DECISION_DIAGRAMS PARALLEL_PROCESSING USE_NUPN
BK_STOP 1679317978254
--------------------
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//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -timeout 360 -rebuildPNML
mcc2023
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-00
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_0_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-01
rfs formula type EF
rfs formula formula --invariant=/tmp/447/inv_1_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-02
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_2_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-03
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_3_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-04
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_4_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-05
rfs formula type EF
rfs formula formula --invariant=/tmp/447/inv_5_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-06
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_6_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-07
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_7_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-08
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_8_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-09
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_9_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-10
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_10_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-11
rfs formula type EF
rfs formula formula --invariant=/tmp/447/inv_11_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-12
rfs formula type EF
rfs formula formula --invariant=/tmp/447/inv_12_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-13
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_13_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-14
rfs formula type EF
rfs formula formula --invariant=/tmp/447/inv_14_
rfs formula name SieveSingleMsgMbox-PT-d2m04-ReachabilityCardinality-15
rfs formula type AG
rfs formula formula --invariant=/tmp/447/inv_15_
pnml2lts-sym: Exploration order is bfs-prev
pnml2lts-sym: Saturation strategy is sat
pnml2lts-sym: Guided search strategy is unguided
pnml2lts-sym: Attractor strategy is default
pnml2lts-sym: opening model.pnml
pnml2lts-sym: Edge label is id
Warning: program compiled against libxml 210 using older 209
pnml2lts-sym: Petri net has 2398 places, 1954 transitions and 7816 arcs
pnml2lts-sym: Petri net SieveSingleMsgMbox-PT-d2m04 analyzed
pnml2lts-sym: There are no safe places
pnml2lts-sym: Loading Petri net took 0.030 real 0.010 user 0.020 sys
pnml2lts-sym: Initializing regrouping layer
pnml2lts-sym: Regroup specification: bs,w2W,ru,hf
pnml2lts-sym: Regroup Boost's Sloan
pnml2lts-sym: Regroup over-approximate must-write to may-write
pnml2lts-sym: Regroup Row sUbsume
pnml2lts-sym: Reqroup Horizontal Flip
pnml2lts-sym: Regrouping: 1954->1954 groups
pnml2lts-sym: Regrouping took 207.270 real 207.110 user 0.050 sys
pnml2lts-sym: state vector length is 2398; there are 1954 groups
pnml2lts-sym: Creating a multi-core ListDD domain.
pnml2lts-sym: Sylvan allocates 15.000 GB virtual memory for nodes table and operation cache.
pnml2lts-sym: Initial nodes table and operation cache requires 60.00 MB.
pnml2lts-sym: Using GBgetTransitionsShortR2W as next-state function
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: got initial state
pnml2lts-sym: Exploration took 52795 group checks and 0 next state calls
pnml2lts-sym: reachability took 0.730 real 2.910 user 0.000 sys
pnml2lts-sym: counting visited states...
pnml2lts-sym: counting took 0.000 real 0.010 user 0.000 sys
pnml2lts-sym: state space has 3601 states, 9452 nodes
pnml2lts-sym: group_next: 875 nodes total
pnml2lts-sym: group_explored: 9475 nodes, 5548 short vectors total
pnml2lts-sym: max token count: 4
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="SieveSingleMsgMbox-PT-d2m04"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="ltsminxred"
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 2-5348"
echo " Executing tool ltsminxred"
echo " Input is SieveSingleMsgMbox-PT-d2m04, examination is ReachabilityCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r425-tajo-167905978200454"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/SieveSingleMsgMbox-PT-d2m04.tgz
mv SieveSingleMsgMbox-PT-d2m04 execution
cd execution
if [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "UpperBounds" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] || [ "ReachabilityCardinality" = "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 [ "ReachabilityCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityCardinality" != "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 "ReachabilityCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityCardinality.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 [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityCardinality"
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 ;