Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2024-input.r338-tall-171679086700007.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2024-input.qcow2 backing_fmt=qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.................
=====================================================================
Generated by BenchKit 2-5568
Executing tool tapaal
Input is Ring-PT-none, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r338-tall-171679086700007
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 504K
-rw-r--r-- 1 mcc users 6.6K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 69K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 4.9K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 46K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 18 16:43 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.1K May 18 16:43 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.4K Apr 23 07:48 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Apr 23 07:48 LTLCardinality.xml
-rw-r--r-- 1 mcc users 1.9K Apr 23 07:48 LTLFireability.txt
-rw-r--r-- 1 mcc users 15K Apr 23 07:48 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Apr 12 03:36 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 121K Apr 12 03:36 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.2K Apr 12 03:35 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 85K Apr 12 03:35 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.5K Apr 23 07:48 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Apr 23 07:48 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 5 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 47K 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

here is the order used to build the result vector(from text file)
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-00
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-01
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-02
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-03
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-04
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-05
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-06
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-07
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-08
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-09
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-10
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-11
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-12
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-13
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-14
FORMULA_NAME Ring-PT-none-ReachabilityFireability-2024-15

=== Now, execution of the tool begins

BK_START 1716896795202

tapaal
Got BK_BIN_PATH=/home/mcc/BenchKit/bin/
---> tapaal --- TAPAAL - v2.2024
Setting MODEL_PATH=.
Setting VERIFYPN=/home/mcc/BenchKit/bin/verifypn
Got BK_TIME_CONFINEMENT=3600
Setting TEMPDIR=/home/mcc/BenchKit/bin/tmp
Got BK_MEMORY_CONFINEMENT=16384
Limiting to 16265216 kB
Total timeout: 3590
Time left: 3590

**********************************************
* TAPAAL verifying ReachabilityFireability *
**********************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0
MF=/home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT
Time left: 3590
---------------------------------------------------
Step -1: Stripping Colors
---------------------------------------------------
Verifying stripped models (16 in total)

Time left: 3590
---------------------------------------------------
Step 0: Parallel Simplification
---------------------------------------------------
Doing parallel simplification (16 in total)
Total simplification timout is 718 -- reduction timeout is 299
timeout 3590 /home/mcc/BenchKit/bin/verifypn -n -q 718 -l 29 -d 299 -z 4 -s OverApprox --binary-query-io 2 --write-simplified /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./ReachabilityFireability.xml

FORMULA Ring-PT-none-ReachabilityFireability-2024-10 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX
Query index 10 was solved

Query is NOT satisfied.
Solution found by parallel simplification (step 0)
Time left: 3590

---------------------------------------------------
Step 0.5: Random Walk Parallel processing
---------------------------------------------------
Doing parallel random walk verification of individual queries (15 in total)
Each query is verified by 4 parallel random walks for 35 seconds each
------------------- QUERY 1 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000371 on verification
@@@0.00,5628@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 1

FORMULA Ring-PT-none-ReachabilityFireability-2024-07 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3590
------------------- QUERY 2 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000347 on verification
@@@0.00,5532@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 2

FORMULA Ring-PT-none-ReachabilityFireability-2024-11 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- QUERY 3 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000294 on verification
@@@0.00,5596@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 3

FORMULA Ring-PT-none-ReachabilityFireability-2024-15 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- QUERY 4 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.00063 on verification
@@@0.00,5528@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 4

FORMULA Ring-PT-none-ReachabilityFireability-2024-04 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- QUERY 5 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000252 on verification
@@@0.00,5564@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 5

FORMULA Ring-PT-none-ReachabilityFireability-2024-02 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- QUERY 6 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.001191 on verification
@@@0.00,5616@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 6

FORMULA Ring-PT-none-ReachabilityFireability-2024-13 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- QUERY 7 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.001147 on verification
@@@0.00,5532@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 7

FORMULA Ring-PT-none-ReachabilityFireability-2024-08 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3588
------------------- QUERY 8 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000844 on verification
@@@0.00,5856@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 8

FORMULA Ring-PT-none-ReachabilityFireability-2024-14 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3588
------------------- QUERY 9 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000804 on verification
@@@0.00,5612@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 9

FORMULA Ring-PT-none-ReachabilityFireability-2024-09 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3588
------------------- QUERY 10 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000704 on verification
@@@0.00,5728@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 10

FORMULA Ring-PT-none-ReachabilityFireability-2024-05 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3588
------------------- QUERY 11 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000494 on verification
@@@0.00,5648@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 11

FORMULA Ring-PT-none-ReachabilityFireability-2024-00 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3588
------------------- QUERY 12 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.002215 on verification
@@@0.01,5560@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 12

FORMULA Ring-PT-none-ReachabilityFireability-2024-01 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3587
------------------- QUERY 13 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.000491 on verification
@@@0.00,5420@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 13

FORMULA Ring-PT-none-ReachabilityFireability-2024-12 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3587
------------------- QUERY 14 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.000389 on verification
@@@0.00,5432@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 14

FORMULA Ring-PT-none-ReachabilityFireability-2024-03 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3587
------------------- QUERY 15 ----------------------
Solution found in Random Walk processing (step 0.5)
Query index 0 was solved

Query is satisfied.

Spent 0.010569 on verification
@@@0.01,5744@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n '-s RandomWalk --seed-offset 0 -q 0 -l 0 -d 0 --init-potency-timeout 0' /home/mcc/BenchKit/bin/tmp/tmp.P2be4OBnWT /home/mcc/BenchKit/bin/tmp/tmp.er25qn77Q0 --binary-query-io 1 -x 15

FORMULA Ring-PT-none-ReachabilityFireability-2024-06 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3587
All queries are solved
Time left: 3587
terminated-with-cleanup

BK_STOP 1716896798644

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

CPN OverApproximation is only usable on colored models

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="Ring-PT-none"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="tapaal"
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 2-5568"
echo " Executing tool tapaal"
echo " Input is Ring-PT-none, 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 r338-tall-171679086700007"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Ring-PT-none.tgz
mv Ring-PT-none 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 ;