About the Execution of ITS-Tools for BugTracking-PT-q3m256
| Execution Summary | |||||
| Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
| 16205.716 | 3600000.00 | 3565549.00 | 83604.70 | [undef] | Time out reached |
Execution Chart
We display below the execution chart for this examination (boot time has been removed).

Trace from the execution
Formatting '/data/fkordon/mcc2026-input.r034-tall-177946841900384.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2026-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 2-5973
Executing tool itstools
Input is BugTracking-PT-q3m256, examination is StateSpace
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r034-tall-177946841900384
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 16M
-rw-r--r-- 1 mcc users 7.2K Mar 5 17:25 CTLCardinality.txt
-rw-r--r-- 1 mcc users 59K Mar 5 17:25 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.5K Mar 5 17:25 CTLFireability.txt
-rw-r--r-- 1 mcc users 59K Mar 5 17:25 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K Mar 15 07:40 LTLCardinality.txt
-rw-r--r-- 1 mcc users 22K Mar 15 07:40 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K Mar 15 07:40 LTLFireability.txt
-rw-r--r-- 1 mcc users 21K Mar 15 07:40 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Mar 5 17:28 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 104K Mar 5 17:28 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.5K Mar 5 17:27 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 67K Mar 5 17:27 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K Mar 15 07:40 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Mar 15 07:40 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 3 18:30 equiv_col
-rw-r--r-- 1 mcc users 7 Mar 3 18:30 instance
-rw-r--r-- 1 mcc users 6 Mar 3 18:30 iscolored
-rw-r--r-- 1 mcc users 16M Mar 3 18:30 model.pnml
--------------------
content from stdout:
=== Data for post analysis generated by BenchKit (invocation template)
no data necessary for post analysis
=== Now, execution of the tool begins
BK_START 1779593336033
Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=StateSpace
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=BugTracking-PT-q3m256
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
StateSpace PT
Running Version 202604301425
[2026-05-24 03:28:57] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, StateSpace, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2026-05-24 03:28:57] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2026-05-24 03:28:58] [INFO ] Load time of PNML (sax parser for PT used): 747 ms
[2026-05-24 03:28:58] [INFO ] Transformed 754 places.
[2026-05-24 03:28:58] [INFO ] Transformed 27370 transitions.
[2026-05-24 03:28:58] [INFO ] Parsed PT model containing 754 places and 27370 transitions and 136172 arcs in 924 ms.
Deduced a syphon composed of 514 places in 118 ms
Reduce places removed 514 places and 24601 transitions.
Starting structural reductions in STATESPACE mode, iteration 0 : 240/240 places, 2769/2769 transitions.
[2026-05-24 03:28:58] [INFO ] Redundant transitions in 200 ms returned []
Running 2767 sub problems to find dead transitions.
[2026-05-24 03:28:58] [INFO ] Flow matrix only has 2642 transitions (discarded 127 similar events)
Running PetriSpot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.petrispot.binaries_1.0.0.202604301425/bin/petri64' '--loadKERS=/tmp/petrispot-input-13200700572964013488.kers' '--Pflows' '--basisKERS=/tmp/petrispot-output-5767740567393073127.kers'
[2026-05-24 03:28:58] [INFO ] Running PetriSpot with arguments : [--loadKERS=/tmp/petrispot-input-13200700572964013488.kers, --Pflows, --basisKERS=/tmp/petrispot-output-5767740567393073127.kers]
Culled 0 columns in 2 ms.
// Phase 1: matrix 2642 rows 240 cols 12480 entries
Finished phase 1 with 230 SingleSign rule and 0 generalized
[2026-05-24 03:28:58] [INFO ] Computed 10 invariants in 13 ms
Computed 10 P flows in 13 ms.
Exported basis to /tmp/petrispot-output-5767740567393073127.kers
Total runtime 16 ms.
[2026-05-24 03:28:58] [INFO ] State equation strengthened by 255 read => feed constraints.
Excessive predecessor constraint size, skipping predecessor.
At refinement iteration 0 (INCLUDED_ONLY) 0/237 variables, 8/8 constraints. Problems are: Problem set: 0 solved, 2767 unsolved
Problem TDEAD1005 is UNSAT
Problem TDEAD1011 is UNSAT
Problem TDEAD1017 is UNSAT
Problem TDEAD1023 is UNSAT
Problem TDEAD1029 is UNSAT
Problem TDEAD1030 is UNSAT
Problem TDEAD1031 is UNSAT
Problem TDEAD1032 is UNSAT
Problem TDEAD1033 is UNSAT
Problem TDEAD1034 is UNSAT
Problem TDEAD1035 is UNSAT
Problem TDEAD1038 is UNSAT
Problem TDEAD1039 is UNSAT
Problem TDEAD1040 is UNSAT
Solver is answering 'unknown', stopping.
After SMT solving in domain Real declared 237/2882 variables, and 12 constraints, problems are : Problem set: 14 solved, 2753 unsolved in 30063 ms.
Refiners :[Positive P Invariants (semi-flows): 8/10 constraints, State Equation: 0/240 constraints, ReadFeed: 0/255 constraints, PredecessorRefiner: 2767/1238 constraints, Known Traps: 4/4 constraints, Known Traps Along Path: 0/0 constraints]
Escalating to Integer solving :Problem set: 14 solved, 2753 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/237 variables, 8/8 constraints. Problems are: Problem set: 14 solved, 2753 unsolved
Problem TDEAD2380 is UNSAT
Problem TDEAD2381 is UNSAT
Problem TDEAD2382 is UNSAT
Problem TDEAD2383 is UNSAT
Problem TDEAD2384 is UNSAT
Problem TDEAD2385 is UNSAT
Problem TDEAD2386 is UNSAT
Problem TDEAD2391 is UNSAT
Problem TDEAD2392 is UNSAT
Problem TDEAD2393 is UNSAT
Problem TDEAD2394 is UNSAT
Problem TDEAD2395 is UNSAT
Problem TDEAD2396 is UNSAT
Problem TDEAD2397 is UNSAT
Problem TDEAD2398 is UNSAT
Problem TDEAD2399 is UNSAT
Problem TDEAD2400 is UNSAT
Problem TDEAD2401 is UNSAT
Problem TDEAD2674 is UNSAT
Problem TDEAD2675 is UNSAT
Problem TDEAD2676 is UNSAT
Problem TDEAD2680 is UNSAT
Problem TDEAD2681 is UNSAT
Problem TDEAD2682 is UNSAT
Problem TDEAD2683 is UNSAT
Problem TDEAD2684 is UNSAT
Problem TDEAD2685 is UNSAT
Problem TDEAD2686 is UNSAT
Problem TDEAD2687 is UNSAT
Problem TDEAD2688 is UNSAT
Problem TDEAD2691 is UNSAT
Problem TDEAD2692 is UNSAT
Problem TDEAD2712 is UNSAT
Problem TDEAD2713 is UNSAT
Problem TDEAD2714 is UNSAT
Problem TDEAD2718 is UNSAT
Problem TDEAD2719 is UNSAT
Problem TDEAD2720 is UNSAT
Problem TDEAD2721 is UNSAT
Problem TDEAD2722 is UNSAT
Problem TDEAD2723 is UNSAT
Problem TDEAD2724 is UNSAT
Problem TDEAD2725 is UNSAT
Problem TDEAD2726 is UNSAT
Problem TDEAD2729 is UNSAT
Problem TDEAD2730 is UNSAT
Problem TDEAD2750 is UNSAT
Problem TDEAD2751 is UNSAT
Problem TDEAD2752 is UNSAT
Problem TDEAD2756 is UNSAT
Problem TDEAD2757 is UNSAT
Problem TDEAD2758 is UNSAT
Problem TDEAD2759 is UNSAT
Problem TDEAD2760 is UNSAT
Problem TDEAD2761 is UNSAT
Problem TDEAD2762 is UNSAT
Problem TDEAD2763 is UNSAT
Problem TDEAD2764 is UNSAT
Problem TDEAD2767 is UNSAT
Problem TDEAD2768 is UNSAT
At refinement iteration 1 (INCLUDED_ONLY) 0/237 variables, 4/12 constraints. Problems are: Problem set: 74 solved, 2693 unsolved
Problem TDEAD2310 is UNSAT
Problem TDEAD2318 is UNSAT
Problem TDEAD2319 is UNSAT
Problem TDEAD2329 is UNSAT
Problem TDEAD2330 is UNSAT
Problem TDEAD2333 is UNSAT
Problem TDEAD2334 is UNSAT
Problem TDEAD2335 is UNSAT
Problem TDEAD2336 is UNSAT
Problem TDEAD2337 is UNSAT
Problem TDEAD2338 is UNSAT
Problem TDEAD2339 is UNSAT
Problem TDEAD2340 is UNSAT
Problem TDEAD2341 is UNSAT
Problem TDEAD2342 is UNSAT
Problem TDEAD2343 is UNSAT
Problem TDEAD2344 is UNSAT
Problem TDEAD2345 is UNSAT
Problem TDEAD2346 is UNSAT
Problem TDEAD2347 is UNSAT
Problem TDEAD2348 is UNSAT
Problem TDEAD2349 is UNSAT
Problem TDEAD2350 is UNSAT
Problem TDEAD2351 is UNSAT
Problem TDEAD2352 is UNSAT
Problem TDEAD2356 is UNSAT
Problem TDEAD2364 is UNSAT
Problem TDEAD2365 is UNSAT
Problem TDEAD2375 is UNSAT
Problem TDEAD2376 is UNSAT
Problem TDEAD2379 is UNSAT
Problem TDEAD2387 is UNSAT
Problem TDEAD2677 is UNSAT
Problem TDEAD2678 is UNSAT
Problem TDEAD2679 is UNSAT
Problem TDEAD2693 is UNSAT
Problem TDEAD2694 is UNSAT
Problem TDEAD2695 is UNSAT
Problem TDEAD2696 is UNSAT
Problem TDEAD2697 is UNSAT
Problem TDEAD2698 is UNSAT
Problem TDEAD2699 is UNSAT
Problem TDEAD2700 is UNSAT
Problem TDEAD2701 is UNSAT
Problem TDEAD2702 is UNSAT
Problem TDEAD2703 is UNSAT
Problem TDEAD2704 is UNSAT
Problem TDEAD2705 is UNSAT
Problem TDEAD2708 is UNSAT
Problem TDEAD2709 is UNSAT
Problem TDEAD2710 is UNSAT
Problem TDEAD2711 is UNSAT
Problem TDEAD2715 is UNSAT
Problem TDEAD2716 is UNSAT
Problem TDEAD2717 is UNSAT
Problem TDEAD2731 is UNSAT
Problem TDEAD2732 is UNSAT
Problem TDEAD2733 is UNSAT
Problem TDEAD2734 is UNSAT
Problem TDEAD2735 is UNSAT
Problem TDEAD2736 is UNSAT
Problem TDEAD2737 is UNSAT
Problem TDEAD2738 is UNSAT
Problem TDEAD2739 is UNSAT
Problem TDEAD2740 is UNSAT
Problem TDEAD2741 is UNSAT
Problem TDEAD2742 is UNSAT
Problem TDEAD2743 is UNSAT
Problem TDEAD2744 is UNSAT
Problem TDEAD2745 is UNSAT
Problem TDEAD2746 is UNSAT
Problem TDEAD2747 is UNSAT
Problem TDEAD2753 is UNSAT
Problem TDEAD2765 is UNSAT
Problem TDEAD2766 is UNSAT
At refinement iteration 2 (INCLUDED_ONLY) 0/237 variables, 10/22 constraints. Problems are: Problem set: 149 solved, 2618 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Int declared 237/2882 variables, and 22 constraints, problems are : Problem set: 149 solved, 2618 unsolved in 30057 ms.
Refiners :[Positive P Invariants (semi-flows): 8/10 constraints, State Equation: 0/240 constraints, ReadFeed: 0/255 constraints, PredecessorRefiner: 1529/1238 constraints, Known Traps: 14/14 constraints, Known Traps Along Path: 0/0 constraints]
After SMT, in 64727ms problems are : Problem set: 149 solved, 2618 unsolved
Search for dead transitions found 149 dead transitions in 64766ms
Found 149 dead transitions using SMT.
Drop transitions (Dead Transitions using SMT only with invariants) removed 149 transitions
Dead transitions reduction (with SMT) removed 149 transitions
Starting structural reductions in STATESPACE mode, iteration 1 : 240/240 places, 2620/2769 transitions.
Reduce places removed 36 places and 829 transitions.
Reduce places removed 23 places and 281 transitions.
Starting structural reductions in STATESPACE mode, iteration 2 : 181/240 places, 1510/2769 transitions.
Finished structural reductions in STATESPACE mode , in 2 iterations and 65178 ms. Remains : 181/240 places, 1510/2769 transitions.
Deduced a syphon composed of 37 places in 3 ms
Reduce places removed 37 places and 566 transitions.
Final net has 144 places and 944 transitions.
[2026-05-24 03:30:03] [INFO ] Flatten gal took : 166 ms
[2026-05-24 03:30:04] [INFO ] Applying decomposition
[2026-05-24 03:30:04] [INFO ] Flatten gal took : 68 ms
Converted graph to binary with : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202604301425/bin/convert-linux64' '-i' '/tmp/graph5928750624777217383.txt' '-o' '/tmp/graph5928750624777217383.bin' '-w' '/tmp/graph5928750624777217383.weights'
Built communities with : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202604301425/bin/louvain-linux64' '/tmp/graph5928750624777217383.bin' '-l' '-1' '-v' '-w' '/tmp/graph5928750624777217383.weights' '-q' '0' '-e' '0.001'
[2026-05-24 03:30:04] [INFO ] Decomposing Gal with order
[2026-05-24 03:30:04] [INFO ] Rewriting arrays to variables to allow decomposition.
[2026-05-24 03:30:04] [INFO ] Removed a total of 139 redundant transitions.
[2026-05-24 03:30:04] [INFO ] Flatten gal took : 149 ms
[2026-05-24 03:30:04] [INFO ] Fuse similar labels procedure discarded/fused a total of 136 labels/synchronizations in 9 ms.
[2026-05-24 03:30:04] [INFO ] Time to serialize gal into /tmp/StateSpace379970617013441879.gal : 19 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/StateSpace379970617013441879.gal' '-t' 'CGAL' '--stats'
its-reach command run as :
/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...218
Detected timeout of ITS tools.
[2026-05-24 03:50:29] [INFO ] Flatten gal took : 370 ms
[2026-05-24 03:50:29] [INFO ] Time to serialize gal into /tmp/StateSpace10587638711966752968.gal : 60 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/StateSpace10587638711966752968.gal' '-t' 'CGAL' '--stats' '--gen-order' 'FOLLOW'
its-reach command run as :
/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...241
Detected timeout of ITS tools.
[2026-05-24 04:10:52] [INFO ] Flatten gal took : 182 ms
[2026-05-24 04:10:54] [INFO ] Input system was already deterministic with 944 transitions.
[2026-05-24 04:10:54] [INFO ] Transformed 144 places.
[2026-05-24 04:10:54] [INFO ] Transformed 944 transitions.
Running greatSPN : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//../itstools/bin//..//greatspn//bin/pinvar' '/home/mcc/execution/gspn'
Run of greatSPN captured in /home/mcc/execution/outPut.txt
Running greatSPN : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//../itstools/bin//..//greatspn//bin/RGMEDD2' '/home/mcc/execution/gspn' '-META' '-varord-only'
Run of greatSPN captured in /home/mcc/execution/outPut.txt
Using order generated by GreatSPN with heuristic : META
[2026-05-24 04:10:54] [INFO ] Time to serialize gal into /tmp/StateSpace13287251703312950866.gal : 27 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/StateSpace13287251703312950866.gal' '-t' 'CGAL' '--stats' '--load-order' '/home/mcc/execution/model.ord' '--gen-order' 'FOLLOW'
its-reach command run as :
/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...286
Successfully loaded order from file /home/mcc/execution/model.ord
BK_TIME_CONFINEMENT_REACHED
--------------------
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
+ [[ StateSpace = StateSpace ]]
+ [[ -f modelMain.xml ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution StateSpace -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202604301425.jar
+ VERSION=202604301425
+ echo 'Running Version 202604301425'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination StateSpace -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
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="BugTracking-PT-q3m256"
export BK_EXAMINATION="StateSpace"
export BK_TOOL="itstools"
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 2-5973"
echo " Executing tool itstools"
echo " Input is BugTracking-PT-q3m256, examination is StateSpace"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r034-tall-177946841900384"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/BugTracking-PT-q3m256.tgz
mv BugTracking-PT-q3m256 execution
cd execution
if [ "StateSpace" = "ReachabilityDeadlock" ] || [ "StateSpace" = "UpperBounds" ] || [ "StateSpace" = "QuasiLiveness" ] || [ "StateSpace" = "StableMarking" ] || [ "StateSpace" = "Liveness" ] || [ "StateSpace" = "OneSafe" ] || [ "StateSpace" = "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 [ "StateSpace" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "StateSpace" != "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 "StateSpace.xml" ] ; then # for cunf (txt files deleted;-)
echo echo "here is the order used to build the result vector(from xml file)"
for x in $(grep '
echo "FORMULA_NAME $x"
done
elif [ "StateSpace" = "ReachabilityDeadlock" ] || [ "StateSpace" = "QuasiLiveness" ] || [ "StateSpace" = "StableMarking" ] || [ "StateSpace" = "Liveness" ] || [ "StateSpace" = "OneSafe" ] ; then
echo "FORMULA_NAME StateSpace"
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 ;
