Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2021-input.r284-smll-162123894500160.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2021-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-4028
Executing tool gold2020
Input is ViralEpidemic-PT-S08D1C2A04, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r284-smll-162123894500160
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 54M
-rw-r--r-- 1 mcc users 22K May 5 16:58 CTLCardinality.txt
-rw-r--r-- 1 mcc users 139K May 10 09:44 CTLCardinality.xml
-rw-r--r-- 1 mcc users 12K May 5 16:58 CTLFireability.txt
-rw-r--r-- 1 mcc users 72K May 10 09:44 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 6 14:48 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.8K May 6 14:48 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 4.2K Mar 28 16:48 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Mar 28 16:48 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K Mar 28 16:48 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Mar 28 16:48 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.4K Mar 27 15:28 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 20K Mar 27 15:28 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 3.6K Mar 26 06:31 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 20K Mar 26 06:31 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K Mar 22 08:17 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Mar 22 08:17 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 5 16:52 equiv_col
-rw-r--r-- 1 mcc users 11 May 5 16:52 instance
-rw-r--r-- 1 mcc users 6 May 5 16:52 iscolored
-rw-r--r-- 1 mcc users 54M May 5 16:52 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 ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-00
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-01
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-02
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-03
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-04
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-05
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-06
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-07
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-08
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-09
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-10
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-11
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-12
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-13
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-14
FORMULA_NAME ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1621491076815

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
[2021-05-20 06:11:19] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -z3path, /home/mcc/BenchKit//z3/bin/z3, -yices2path, /home/mcc/BenchKit//yices/bin/yices, -timeout, 3600, -rebuildPNML]
[2021-05-20 06:11:19] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2021-05-20 06:11:22] [INFO ] Load time of PNML (sax parser for PT used): 2774 ms
[2021-05-20 06:11:22] [INFO ] Transformed 46811 places.
[2021-05-20 06:11:22] [INFO ] Transformed 79577 transitions.
[2021-05-20 06:11:22] [INFO ] Parsed PT model containing 46811 places and 79577 transitions in 3292 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 479 ms.
Working with output stream class java.io.PrintStream
Incomplete random walk after 10000 steps, including 3 resets, run finished after 3674 ms. (steps per millisecond=2 ) properties seen :[0, 0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0]
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-11 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-04 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1759 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1706 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1673 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1670 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1681 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1670 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1660 ms. (steps per millisecond=6 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1656 ms. (steps per millisecond=6 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1670 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 0 resets, run finished after 1692 ms. (steps per millisecond=5 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
// Phase 1: matrix 79577 rows 46811 cols
[2021-05-20 06:13:05] [INFO ] Computed 1 place invariants in 81809 ms
[2021-05-20 06:13:11] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Stream closed") while checking expression at index 0
[2021-05-20 06:13:16] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Broken pipe") while checking expression at index 1
[2021-05-20 06:13:21] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Failed to assert expression: java.io.IOException: Broken pipe (>= s45764 0)") while checking expression at index 2
[2021-05-20 06:13:26] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Broken pipe") while checking expression at index 3
[2021-05-20 06:13:31] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Failed to assert expression: java.io.IOException: Broken pipe (>= s43586 0)") while checking expression at index 4
[2021-05-20 06:13:36] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Broken pipe") while checking expression at index 5
[2021-05-20 06:13:41] [INFO ] SMT solver returned unknown. Retrying;
[2021-05-20 06:13:41] [INFO ] [Real]Absence check using 0 positive and 1 generalized place invariants in 201 ms returned (error "Failed to check-sat")
[2021-05-20 06:13:41] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2021-05-20 06:13:41] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Stream closed") while checking expression at index 6
[2021-05-20 06:13:46] [INFO ] SMT solver returned unknown. Retrying;
[2021-05-20 06:13:46] [INFO ] [Real]Absence check using 0 positive and 1 generalized place invariants in 143 ms returned (error "Failed to check-sat")
[2021-05-20 06:13:46] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2021-05-20 06:13:46] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Stream closed") while checking expression at index 7
[2021-05-20 06:13:51] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Broken pipe") while checking expression at index 8
[2021-05-20 06:13:56] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Broken pipe") while checking expression at index 9
Support contains 136 out of 46811 places. Attempting structural reductions.
Starting structural reductions, iteration 0 : 46811/46811 places, 79577/79577 transitions.
Discarding 45957 places :
Also discarding 77905 output transitions
Drop transitions removed 77905 transitions
Graph (complete) has 37448 edges and 46811 vertex of which 854 are kept as prefixes of interest. Removing 45957 places using SCC suffix rule.333 ms
Drop transitions removed 876 transitions
Reduce isomorphic transitions removed 876 transitions.
Performed 22 Post agglomeration using F-continuation condition.Transition count delta: 22
Iterating post reduction 0 with 898 rules applied. Total rules applied 899 place count 854 transition count 774
Reduce places removed 22 places and 0 transitions.
Iterating post reduction 1 with 22 rules applied. Total rules applied 921 place count 832 transition count 774
Performed 55 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 2 with 55 Pre rules applied. Total rules applied 921 place count 832 transition count 719
Deduced a syphon composed of 55 places in 1 ms
Reduce places removed 55 places and 0 transitions.
Iterating global reduction 2 with 110 rules applied. Total rules applied 1031 place count 777 transition count 719
Symmetric choice reduction at 2 with 406 rule applications. Total rules 1437 place count 777 transition count 719
Deduced a syphon composed of 406 places in 1 ms
Reduce places removed 406 places and 406 transitions.
Iterating global reduction 2 with 812 rules applied. Total rules applied 2249 place count 371 transition count 313
Performed 28 Post agglomeration using F-continuation condition.Transition count delta: 28
Deduced a syphon composed of 28 places in 1 ms
Reduce places removed 28 places and 0 transitions.
Iterating global reduction 2 with 56 rules applied. Total rules applied 2305 place count 343 transition count 285
Free-agglomeration rule applied 2 times.
Iterating global reduction 2 with 2 rules applied. Total rules applied 2307 place count 343 transition count 283
Reduce places removed 2 places and 0 transitions.
Iterating post reduction 2 with 2 rules applied. Total rules applied 2309 place count 341 transition count 283
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 3 with 1 rules applied. Total rules applied 2310 place count 340 transition count 282
Applied a total of 2310 rules in 568 ms. Remains 340 /46811 variables (removed 46471) and now considering 282/79577 (removed 79295) transitions.
Finished structural reductions, in 1 iterations. Remains : 340/46811 places, 282/79577 transitions.
Finished random walk after 11734 steps, including 49 resets, run visited all 10 properties in 126 ms. (steps per millisecond=93 )
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-14 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-13 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-10 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-01 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA ViralEpidemic-PT-S08D1C2A04-ReachabilityFireability-00 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
All properties solved without resorting to model-checking.

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

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="ViralEpidemic-PT-S08D1C2A04"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="gold2020"
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 2-4028"
echo " Executing tool gold2020"
echo " Input is ViralEpidemic-PT-S08D1C2A04, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r284-smll-162123894500160"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/ViralEpidemic-PT-S08D1C2A04.tgz
mv ViralEpidemic-PT-S08D1C2A04 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "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 "ReachabilityFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityFireability.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 '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;