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.r019-oct2-167813607700428.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 backing_fmt=qcow2 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5348
Executing tool itstools
Input is AutonomousCar-PT-10b, examination is StableMarking
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r019-oct2-167813607700428
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 2.0M
-rw-r--r-- 1 mcc users 6.8K Feb 25 12:52 CTLCardinality.txt
-rw-r--r-- 1 mcc users 70K Feb 25 12:52 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 25 12:52 CTLFireability.txt
-rw-r--r-- 1 mcc users 48K Feb 25 12:52 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.8K Feb 25 15:34 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 15:34 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Feb 25 15:34 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Feb 25 15:34 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Feb 25 12:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 117K Feb 25 12:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.4K Feb 25 12:53 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 59K Feb 25 12:53 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 15:34 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Feb 25 15:34 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 4 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 1.6M 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 StableMarking

=== Now, execution of the tool begins

BK_START 1678896642532

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=itstools
BK_EXAMINATION=StableMarking
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=AutonomousCar-PT-10b
Not applying reductions.
Model is PT
StableMarking PT
Running Version 202303021504
[2023-03-15 16:10:45] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, StableMarking, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 1800]
[2023-03-15 16:10:46] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-15 16:10:46] [INFO ] Load time of PNML (sax parser for PT used): 280 ms
[2023-03-15 16:10:46] [INFO ] Transformed 425 places.
[2023-03-15 16:10:46] [INFO ] Transformed 2252 transitions.
[2023-03-15 16:10:46] [INFO ] Found NUPN structural information;
[2023-03-15 16:10:46] [INFO ] Parsed PT model containing 425 places and 2252 transitions and 29816 arcs in 523 ms.
Graph (trivial) has 409 edges and 425 vertex of which 4 / 425 are part of one of the 2 SCC in 5 ms
Free SCC test removed 2 places
Structural test allowed to assert that 91 places are NOT stable. Took 40 ms.
Ensure Unique test removed 2 transitions
Reduce redundant transitions removed 2 transitions.
Incomplete random walk after 10000 steps, including 77 resets, run finished after 979 ms. (steps per millisecond=10 ) properties (out of 334) seen :250
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 20 ms. (steps per millisecond=50 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=250 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 5 ms. (steps per millisecond=200 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 27 ms. (steps per millisecond=37 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 70 ms. (steps per millisecond=14 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 23 ms. (steps per millisecond=43 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 27 ms. (steps per millisecond=37 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 31 ms. (steps per millisecond=32 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 18 ms. (steps per millisecond=55 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 41 ms. (steps per millisecond=24 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=41 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 19 ms. (steps per millisecond=52 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 49 ms. (steps per millisecond=20 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 20 ms. (steps per millisecond=50 ) properties (out of 84) seen :0
[2023-03-15 16:10:48] [INFO ] Flatten gal took : 897 ms
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 29 ms. (steps per millisecond=34 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 29 ms. (steps per millisecond=34 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 27 ms. (steps per millisecond=37 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 22 ms. (steps per millisecond=45 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 21 ms. (steps per millisecond=47 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 61 ms. (steps per millisecond=16 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 23 ms. (steps per millisecond=43 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 20 ms. (steps per millisecond=50 ) properties (out of 84) seen :0
[2023-03-15 16:10:48] [INFO ] Flatten gal took : 286 ms
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 62 ms. (steps per millisecond=16 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 21 ms. (steps per millisecond=47 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=41 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=41 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 43 ms. (steps per millisecond=23 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 34 ms. (steps per millisecond=29 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 27 ms. (steps per millisecond=37 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 84) seen :0
[2023-03-15 16:10:48] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality7888090673649445424.gal : 183 ms
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 18 ms. (steps per millisecond=55 ) properties (out of 84) seen :0
[2023-03-15 16:10:48] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality14763248482318547890.prop : 10 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality7888090673649445424.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality14763248482318547890.prop' '--nowitness' '--gen-order' 'FOLLOW'
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=41 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 23 ms. (steps per millisecond=43 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=250 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 4 ms. (steps per millisecond=250 ) properties (out of 84) seen :0

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...329
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 62 ms. (steps per millisecond=16 ) properties (out of 84) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 84) seen :0
Running SMT prover for 84 properties.
[2023-03-15 16:10:49] [INFO ] Flow matrix only has 2249 transitions (discarded 1 similar events)
// Phase 1: matrix 2249 rows 423 cols
[2023-03-15 16:10:49] [INFO ] Computed 15 place invariants in 45 ms
Loading property file /tmp/ReachabilityCardinality14763248482318547890.prop.
[2023-03-15 16:10:50] [INFO ] After 1239ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:84
SDD proceeding with computation,84 properties remain. new max is 4
SDD size :1 after 2
SDD proceeding with computation,84 properties remain. new max is 8
SDD size :2 after 4
SDD proceeding with computation,84 properties remain. new max is 16
SDD size :4 after 5
SDD proceeding with computation,84 properties remain. new max is 32
SDD size :5 after 6
SDD proceeding with computation,84 properties remain. new max is 64
SDD size :6 after 27
SDD proceeding with computation,84 properties remain. new max is 128
SDD size :27 after 61
SDD proceeding with computation,84 properties remain. new max is 256
SDD size :61 after 76
SDD proceeding with computation,84 properties remain. new max is 512
SDD size :76 after 1041
[2023-03-15 16:10:52] [INFO ] [Nat]Absence check using 15 positive place invariants in 117 ms returned sat
[2023-03-15 16:11:01] [INFO ] After 7792ms SMT Verify possible using state equation in natural domain returned unsat :1 sat :83
[2023-03-15 16:11:01] [INFO ] State equation strengthened by 1 read => feed constraints.
Invariant property smplace_50 does not hold.
Invariant property smplace_49 does not hold.
SDD proceeding with computation,82 properties remain. new max is 512
SDD size :1041 after 2.27195e+07
Invariant property smplace_81 does not hold.
Invariant property smplace_80 does not hold.
SDD proceeding with computation,80 properties remain. new max is 512
SDD size :2.27195e+07 after 2.27224e+07
SDD proceeding with computation,80 properties remain. new max is 1024
SDD size :2.27224e+07 after 2.27408e+07
Invariant property smplace_112 does not hold.
Invariant property smplace_111 does not hold.
SDD proceeding with computation,78 properties remain. new max is 1024
SDD size :2.27408e+07 after 2.27966e+07
SDD proceeding with computation,78 properties remain. new max is 2048
SDD size :2.27966e+07 after 2.31346e+07
Invariant property smplace_143 does not hold.
Invariant property smplace_142 does not hold.
SDD proceeding with computation,76 properties remain. new max is 2048
SDD size :2.31346e+07 after 2.46019e+07
Invariant property smplace_174 does not hold.
Invariant property smplace_173 does not hold.
SDD proceeding with computation,74 properties remain. new max is 2048
SDD size :2.46019e+07 after 5.53366e+07
SDD proceeding with computation,74 properties remain. new max is 4096
SDD size :5.53366e+07 after 6.65827e+07
Invariant property smplace_205 does not hold.
Invariant property smplace_204 does not hold.
SDD proceeding with computation,72 properties remain. new max is 4096
SDD size :6.65827e+07 after 6.05405e+08
[2023-03-15 16:11:08] [INFO ] After 7520ms SMT Verify possible using 1 Read/Feed constraints in natural domain returned unsat :1 sat :83
SDD proceeding with computation,72 properties remain. new max is 8192
SDD size :6.05405e+08 after 8.29521e+08
[2023-03-15 16:11:12] [INFO ] Deduced a trap composed of 29 places in 834 ms of which 7 ms to minimize.
[2023-03-15 16:11:12] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 985 ms
[2023-03-15 16:11:14] [INFO ] Deduced a trap composed of 44 places in 1663 ms of which 1 ms to minimize.
SDD proceeding with computation,72 properties remain. new max is 16384
SDD size :8.29521e+08 after 1.77184e+10
[2023-03-15 16:11:15] [INFO ] Deduced a trap composed of 35 places in 1070 ms of which 2 ms to minimize.
[2023-03-15 16:11:15] [INFO ] Trap strengthening (SAT) tested/added 3/2 trap constraints in 2986 ms
[2023-03-15 16:11:15] [INFO ] After 14651ms SMT Verify possible using trap constraints in natural domain returned unsat :1 sat :82
Attempting to minimize the solution found.
Minimization took 1 ms.
[2023-03-15 16:11:15] [INFO ] After 25031ms SMT Verify possible using all constraints in natural domain returned unsat :1 sat :82
FORMULA StableMarking TRUE TECHNIQUES RANDOM_WALK STRUCTURAL_REDUCTION MARKED_SUFFIX_TEST DECISION_DIAGRAMS TRIVIAL_UNMARKED_SCC_TEST COLLATERAL_PROCESSING TOPOLOGICAL SAT_SMT
ITS runner failed with exception null
java.lang.InterruptedException
at java.base/java.lang.Object.wait(Native Method)
at java.base/java.lang.Thread.join(Thread.java:1304)
at java.base/java.lang.Thread.join(Thread.java:1372)
at fr.lip6.move.gal.application.runner.AbstractRunner.join(AbstractRunner.java:27)
at fr.lip6.move.gal.application.runner.its.ITSRunner.join(ITSRunner.java:177)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.verifyWithSDD(GlobalPropertySolver.java:675)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.lambda$2(ReachabilitySolver.java:63)
at java.base/java.lang.Thread.run(Thread.java:833)
Total runtime 29877 ms.

BK_STOP 1678896676533

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

+ export BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ StableMarking = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution StableMarking -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800
+ 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//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination StableMarking -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800

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="AutonomousCar-PT-10b"
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 2-5348"
echo " Executing tool itstools"
echo " Input is AutonomousCar-PT-10b, 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 r019-oct2-167813607700428"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/AutonomousCar-PT-10b.tgz
mv AutonomousCar-PT-10b 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 ;