Execution Chart

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

Trace from the execution

Formatting '/mnt/tpsp/fkordon/mcc2024-input.r308-tajo-171654461500278.qcow2', fmt=qcow2 size=4294967296 backing_file='/mnt/tpsp/fkordon/mcc2024-input.qcow2' backing_fmt='qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
......................
=====================================================================
Generated by BenchKit 2-5568
Executing tool gold2023
Input is PolyORBNT-PT-S05J20, examination is StableMarking
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r308-tajo-171654461500278
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 2.4M
-rw-r--r-- 1 mcc users 17K Apr 12 09:48 CTLCardinality.txt
-rw-r--r-- 1 mcc users 113K Apr 12 09:48 CTLCardinality.xml
-rw-r--r-- 1 mcc users 50K Apr 12 09:46 CTLFireability.txt
-rw-r--r-- 1 mcc users 220K Apr 12 09:46 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 18 16:43 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 9.0K Apr 23 07:44 LTLCardinality.txt
-rw-r--r-- 1 mcc users 39K Apr 23 07:44 LTLCardinality.xml
-rw-r--r-- 1 mcc users 23K Apr 23 07:44 LTLFireability.txt
-rw-r--r-- 1 mcc users 74K Apr 23 07:44 LTLFireability.xml
-rw-r--r-- 1 mcc users 25K Apr 12 09:55 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 128K Apr 12 09:55 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 22K Apr 12 09:54 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 100K Apr 12 09:54 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.2K Apr 23 07:44 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.7K Apr 23 07:44 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 7 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 1.6M May 18 16:43 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 1717191084877

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=gold2023
BK_EXAMINATION=StableMarking
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=PolyORBNT-PT-S05J20
Not applying reductions.
Model is PT
StableMarking PT
Running Version 202304061127
[2024-05-31 21:31:26] [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]
[2024-05-31 21:31:26] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-31 21:31:26] [INFO ] Load time of PNML (sax parser for PT used): 117 ms
[2024-05-31 21:31:26] [INFO ] Transformed 349 places.
[2024-05-31 21:31:26] [INFO ] Transformed 1210 transitions.
[2024-05-31 21:31:26] [INFO ] Parsed PT model containing 349 places and 1210 transitions and 8824 arcs in 197 ms.
Structural test allowed to assert that 2 places are NOT stable. Took 9 ms.
Ensure Unique test removed 655 transitions
Reduce redundant transitions removed 655 transitions.
[2024-05-31 21:31:27] [INFO ] Flatten gal took : 256 ms
[2024-05-31 21:31:27] [INFO ] Flatten gal took : 107 ms
[2024-05-31 21:31:27] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality7689362014290749951.gal : 44 ms
[2024-05-31 21:31:27] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality3481538624659148217.prop : 3 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202304061127/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality7689362014290749951.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality3481538624659148217.prop' '--nowitness' '--gen-order' 'FOLLOW'
Incomplete random walk after 10000 steps, including 692 resets, run finished after 705 ms. (steps per millisecond=14 ) properties (out of 347) seen :285
Incomplete Best-First random walk after 1000 steps, including 18 resets, run finished after 21 ms. (steps per millisecond=47 ) properties (out of 62) seen :2

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202304061127/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...328
Incomplete Best-First random walk after 1001 steps, including 17 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 60) seen :3
Incomplete Best-First random walk after 1000 steps, including 14 resets, run finished after 7 ms. (steps per millisecond=142 ) properties (out of 57) seen :2
Incomplete Best-First random walk after 1001 steps, including 11 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 55) seen :3
Incomplete Best-First random walk after 1001 steps, including 16 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 52) seen :1
Incomplete Best-First random walk after 1001 steps, including 25 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 51) seen :0
Incomplete Best-First random walk after 1001 steps, including 16 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 51) seen :0
Incomplete Best-First random walk after 1001 steps, including 14 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 51) seen :1
Incomplete Best-First random walk after 1000 steps, including 17 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 50) seen :0
Incomplete Best-First random walk after 1001 steps, including 17 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 50) seen :1
Incomplete Best-First random walk after 1000 steps, including 18 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 49) seen :0
Incomplete Best-First random walk after 1001 steps, including 25 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 49) seen :0
Loading property file /tmp/ReachabilityCardinality3481538624659148217.prop.
Incomplete Best-First random walk after 1001 steps, including 19 resets, run finished after 24 ms. (steps per millisecond=41 ) properties (out of 49) seen :2
Incomplete Best-First random walk after 1001 steps, including 19 resets, run finished after 16 ms. (steps per millisecond=62 ) properties (out of 47) seen :1
Incomplete Best-First random walk after 1001 steps, including 26 resets, run finished after 23 ms. (steps per millisecond=43 ) properties (out of 46) seen :0
Incomplete Best-First random walk after 1001 steps, including 18 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 46) seen :1
Incomplete Best-First random walk after 1001 steps, including 12 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 45) seen :0
Incomplete Best-First random walk after 1001 steps, including 18 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 45) seen :0
Incomplete Best-First random walk after 1001 steps, including 23 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 45) seen :0
Incomplete Best-First random walk after 1001 steps, including 19 resets, run finished after 21 ms. (steps per millisecond=47 ) properties (out of 45) seen :3
Incomplete Best-First random walk after 1001 steps, including 16 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 42) seen :0
Incomplete Best-First random walk after 1000 steps, including 25 resets, run finished after 19 ms. (steps per millisecond=52 ) properties (out of 42) seen :0
Incomplete Best-First random walk after 1000 steps, including 11 resets, run finished after 18 ms. (steps per millisecond=55 ) properties (out of 42) seen :4
Invariant property smplace_333 does not hold.
Invariant property smplace_330 does not hold.
Incomplete Best-First random walk after 1000 steps, including 26 resets, run finished after 20 ms. (steps per millisecond=50 ) properties (out of 38) seen :0
Incomplete Best-First random walk after 1001 steps, including 12 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 38) seen :0
Invariant property smplace_291 does not hold.
Incomplete Best-First random walk after 1001 steps, including 17 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 38) seen :0
Incomplete Best-First random walk after 1000 steps, including 25 resets, run finished after 18 ms. (steps per millisecond=55 ) properties (out of 38) seen :0
Incomplete Best-First random walk after 1001 steps, including 18 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 38) seen :0
Invariant property smplace_237 does not hold.
Incomplete Best-First random walk after 1001 steps, including 24 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 38) seen :0
Invariant property smplace_195 does not hold.
Incomplete Best-First random walk after 1001 steps, including 18 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 38) seen :0
Incomplete Best-First random walk after 1001 steps, including 19 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 38) seen :2
Invariant property smplace_159 does not hold.
Invariant property smplace_154 does not hold.
Incomplete Best-First random walk after 1001 steps, including 20 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 36) seen :3
Incomplete Best-First random walk after 1001 steps, including 24 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 33) seen :0
Invariant property smplace_121 does not hold.
Incomplete Best-First random walk after 1001 steps, including 18 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 33) seen :0
Invariant property smplace_95 does not hold.
Invariant property smplace_92 does not hold.
Invariant property smplace_80 does not hold.
Incomplete Best-First random walk after 1001 steps, including 18 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 33) seen :1
Incomplete Best-First random walk after 1001 steps, including 20 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 32) seen :0
Invariant property smplace_35 does not hold.
Incomplete Best-First random walk after 1001 steps, including 17 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 32) seen :0
Invariant property smplace_2 does not hold.
SDD proceeding with computation,334 properties remain. new max is 2
SDD size :1 after 16
Incomplete Best-First random walk after 1000 steps, including 24 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 32) seen :0
Incomplete Best-First random walk after 1000 steps, including 26 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 32) seen :0
Incomplete Best-First random walk after 1001 steps, including 13 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 32) seen :0
Invariant property smplace_346 does not hold.
Invariant property smplace_296 does not hold.
Running SMT prover for 32 properties.
[2024-05-31 21:31:28] [INFO ] Flow matrix only has 551 transitions (discarded 4 similar events)
// Phase 1: matrix 551 rows 349 cols
[2024-05-31 21:31:28] [INFO ] Computed 62 invariants in 44 ms
Invariant property smplace_196 does not hold.
SDD proceeding with computation,331 properties remain. new max is 2
SDD size :16 after 32
[2024-05-31 21:31:28] [INFO ] After 351ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:32
[2024-05-31 21:31:28] [INFO ] [Nat]Absence check using 42 positive place invariants in 12 ms returned sat
SDD proceeding with computation,331 properties remain. new max is 4
SDD size :32 after 64
[2024-05-31 21:31:28] [INFO ] [Nat]Absence check using 42 positive and 20 generalized place invariants in 17 ms returned sat
Invariant property smplace_281 does not hold.
Invariant property smplace_181 does not hold.
Invariant property smplace_104 does not hold.
SDD proceeding with computation,328 properties remain. new max is 4
SDD size :64 after 98
Invariant property smplace_222 does not hold.
SDD proceeding with computation,327 properties remain. new max is 4
SDD size :98 after 99
SDD proceeding with computation,327 properties remain. new max is 8
SDD size :99 after 101
SDD proceeding with computation,327 properties remain. new max is 16
SDD size :101 after 102
Invariant property smplace_151 does not hold.
Invariant property smplace_138 does not hold.
SDD proceeding with computation,325 properties remain. new max is 16
SDD size :102 after 105
SDD proceeding with computation,325 properties remain. new max is 32
SDD size :105 after 106
SDD proceeding with computation,325 properties remain. new max is 64
SDD size :106 after 109
SDD proceeding with computation,325 properties remain. new max is 128
SDD size :109 after 114
SDD proceeding with computation,325 properties remain. new max is 256
SDD size :114 after 121
SDD proceeding with computation,325 properties remain. new max is 512
SDD size :121 after 137
SDD proceeding with computation,325 properties remain. new max is 1024
SDD size :137 after 169
[2024-05-31 21:31:40] [INFO ] After 11142ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :31
[2024-05-31 21:31:40] [INFO ] State equation strengthened by 1 read => feed constraints.
[2024-05-31 21:31:53] [INFO ] After 13383ms SMT Verify possible using 1 Read/Feed constraints in natural domain returned unsat :0 sat :29
[2024-05-31 21:31:53] [INFO ] After 13387ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :29
Attempting to minimize the solution found.
Minimization took 1 ms.
[2024-05-31 21:31:53] [INFO ] After 25036ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :29
Parikh walk visited 0 properties in 608 ms.
Support contains 32 out of 349 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 349/349 places, 555/555 transitions.
Ensure Unique test removed 5 places
Drop transitions removed 17 transitions
Trivial Post-agglo rules discarded 17 transitions
Performed 17 trivial Post agglomeration. Transition count delta: 17
Iterating post reduction 0 with 22 rules applied. Total rules applied 22 place count 344 transition count 538
Reduce places removed 17 places and 0 transitions.
Iterating post reduction 1 with 17 rules applied. Total rules applied 39 place count 327 transition count 538
Performed 17 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 2 with 17 Pre rules applied. Total rules applied 39 place count 327 transition count 521
Deduced a syphon composed of 17 places in 1 ms
Reduce places removed 17 places and 0 transitions.
Iterating global reduction 2 with 34 rules applied. Total rules applied 73 place count 310 transition count 521
Discarding 1 places :
Symmetric choice reduction at 2 with 1 rule applications. Total rules 74 place count 309 transition count 520
Iterating global reduction 2 with 1 rules applied. Total rules applied 75 place count 309 transition count 520
Performed 2 Post agglomeration using F-continuation condition.Transition count delta: 2
Deduced a syphon composed of 2 places in 1 ms
Reduce places removed 2 places and 0 transitions.
Iterating global reduction 2 with 4 rules applied. Total rules applied 79 place count 307 transition count 518
Applied a total of 79 rules in 121 ms. Remains 307 /349 variables (removed 42) and now considering 518/555 (removed 37) transitions.
[2024-05-31 21:31:54] [INFO ] Flow matrix only has 514 transitions (discarded 4 similar events)
// Phase 1: matrix 514 rows 307 cols
[2024-05-31 21:31:54] [INFO ] Computed 57 invariants in 10 ms
[2024-05-31 21:31:54] [INFO ] Dead Transitions using invariants and state equation in 327 ms found 95 transitions.
Found 95 dead transitions using SMT.
Drop transitions removed 95 transitions
Dead transitions reduction (with SMT) triggered by suspicious arc values removed 95 transitions.
Starting structural reductions in REACHABILITY mode, iteration 1 : 307/349 places, 423/555 transitions.
Applied a total of 0 rules in 21 ms. Remains 307 /307 variables (removed 0) and now considering 423/423 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 473 ms. Remains : 307/349 places, 423/555 transitions.
Finished random walk after 2198 steps, including 109 resets, run visited all 32 properties in 84 ms. (steps per millisecond=26 )
Parikh walk visited 0 properties in 0 ms.
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)
Able to resolve query StableMarking after proving 348 properties.
FORMULA StableMarking FALSE TECHNIQUES RANDOM_WALK MARKED_SUFFIX_TEST BESTFIRST_WALK TOPOLOGICAL
Total runtime 28223 ms.

BK_STOP 1717191115377

--------------------
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_1.0.0.202304061127.jar
+ VERSION=202304061127
+ echo 'Running Version 202304061127'
+ /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="PolyORBNT-PT-S05J20"
export BK_EXAMINATION="StableMarking"
export BK_TOOL="gold2023"
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 2-5568"
echo " Executing tool gold2023"
echo " Input is PolyORBNT-PT-S05J20, 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 r308-tajo-171654461500278"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/PolyORBNT-PT-S05J20.tgz
mv PolyORBNT-PT-S05J20 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 ;