Execution Chart

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

Trace from the execution

Waiting for the VM to be ready (probing ssh)
.................
/home/mcc/execution
total 1.4M
-rw-r--r-- 1 mcc users 5.3K May 15 18:54 CTLCardinality.txt
-rw-r--r-- 1 mcc users 26K May 15 18:54 CTLCardinality.xml
-rw-r--r-- 1 mcc users 3.6K May 15 18:54 CTLFireability.txt
-rw-r--r-- 1 mcc users 19K May 15 18:54 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K May 15 18:50 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.4K May 15 18:50 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 2.8K May 15 18:54 LTLCardinality.txt
-rw-r--r-- 1 mcc users 11K May 15 18:54 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K May 15 18:54 LTLFireability.txt
-rw-r--r-- 1 mcc users 11K May 15 18:54 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.1K May 15 18:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 18K May 15 18:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 110 May 15 18:54 ReachabilityDeadlock.txt
-rw-r--r-- 1 mcc users 348 May 15 18:54 ReachabilityDeadlock.xml
-rw-r--r-- 1 mcc users 3.5K May 15 18:54 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 16K May 15 18:54 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K May 15 18:54 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K May 15 18:54 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 15 18:50 equiv_col
-rw-r--r-- 1 mcc users 3 May 15 18:50 instance
-rw-r--r-- 1 mcc users 6 May 15 18:50 iscolored
-rw-r--r-- 1 mcc users 1.2M May 15 18:50 model.pnml
=====================================================================
Generated by BenchKit 2-3637
Executing tool irma4mcc-full
Input is SimpleLoadBal-PT-15, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r174-smll-152708744900168
=====================================================================

--------------------
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 SimpleLoadBal-PT-15-ReachabilityFireability-00
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-01
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-02
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-03
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-04
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-05
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-06
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-07
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-08
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-09
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-10
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-11
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-12
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-13
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-14
FORMULA_NAME SimpleLoadBal-PT-15-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1527155123547


BK_STOP 1527155351214

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

Prefix is 65b80f64.
Reading known information in /usr/share/mcc4mcc/65b80f64-known.json.
Reading learned information in /usr/share/mcc4mcc/65b80f64-learned.json.
Reading value translations in /usr/share/mcc4mcc/65b80f64-values.json.
Using directory /home/mcc/execution for input, as it contains a model.pnml file.
Using SimpleLoadBal-PT-15 as instance name.
Using SimpleLoadBal as model name.
Using algorithm or tool decision-tree.
Model characteristics are: {'Examination': 'ReachabilityFireability', 'Place/Transition': True, 'Colored': False, 'Relative-Time': 1, 'Relative-Memory': 1, 'Ordinary': True, 'Simple Free Choice': False, 'Extended Free Choice': False, 'State Machine': False, 'Marked Graph': False, 'Connected': True, 'Strongly Connected': True, 'Source Place': False, 'Sink Place': False, 'Source Transition': False, 'Sink Transition': False, 'Loop Free': False, 'Conservative': False, 'Sub-Conservative': False, 'Nested Units': False, 'Safe': True, 'Deadlock': False, 'Reversible': False, 'Quasi Live': None, 'Live': None}.
Known tools are: [{'Time': 506520, 'Memory': 956.36, 'Tool': 'lola'}, {'Time': 506828, 'Memory': 1482.2, 'Tool': 'lola'}].
Learned tools are: [{'Tool': 'lola'}].
Learned tool lola is 1.0x far from the best tool lola.
ReachabilityFireability lola SimpleLoadBal-PT-15...

Time: 3600 - MCC
----- Start make prepare stdout -----
----- Start make prepare stderr -----
===========================================================================================
SimpleLoadBal-PT-15: translating PT Petri net model.pnml into LoLA format
===========================================================================================
translating PT Petri net complete


checking for too many tokens
===========================================================================================
SimpleLoadBal-PT-15: translating PT formula ReachabilityFireability into LoLA format
===========================================================================================
translating formula complete
touch formulae;
----- Start make result stdout -----
----- Start make result stderr -----
ReachabilityFireability @ SimpleLoadBal-PT-15 @ 3540 seconds
Makefile:222: recipe for target 'verify' failed
make: [verify] Error 134 (ignored)
----- Start make result stdout -----
----- Start make result stderr -----
lola: LoLA will run for 3540 seconds at most (--timelimit)
lola: NET
lola: reading net from model.pnml.lola
lola: finished parsing
lola: closed net file model.pnml.lola
lola: 1429/65536 symbol table entries, 126 collisions
lola: preprocessing...
lola: finding significant places
lola: 149 places, 1280 transitions, 110 significant places
lola: computing forward-conflicting sets
lola: computing back-conflicting sets
lola: 2081 transition conflict sets
lola: TASK
lola: reading formula from SimpleLoadBal-PT-15-ReachabilityFireability.task
lola: A (G ((FIREABLE(T-lb_route_to_2_307) OR (NOT FIREABLE(T-lb_route_to_2_3447) AND NOT FIREABLE(T-lb_route_to_1_717)) OR FIREABLE(T-lb_balance_to_2_2531)))) : E (F (FIREABLE(T-lb_balance_to_1_2330))) : E (F ((NOT FIREABLE(T-lb_balance_to_1_2083) AND ((FIREABLE(T-lb_route_to_2_136) AND NOT FIREABLE(T-lb_receive_client_12)) OR FIREABLE(T-lb_balance_to_1_1817))))) : A (G (NOT FIREABLE(T-lb_balance_to_2_2021))) : E (F ((((NOT FIREABLE(T-lb_route_to_1_172) AND NOT FIREABLE(T-lb_route_to_1_2031)) OR (FIREABLE(T-lb_route_to_2_221) AND FIREABLE(T-lb_route_to_2_836) AND (FIREABLE(T-lb_balancing_receive_notification_27) OR FIREABLE(T-lb_route_to_1_1554)))) AND (FIREABLE(T-lb_route_to_1_1349) OR (NOT FIREABLE(T-lb_route_to_1_1571) AND (FIREABLE(T-lb_route_to_1_461) OR FIREABLE(T-lb_route_to_1_2475))))))) : E (F ((FIREABLE(T-lb_route_to_1_3756) OR (FIREABLE(T-lb_no_balance_222) AND FIREABLE(T-lb_route_to_1_1622))))) : A (G (((NOT FIREABLE(T-lb_route_to_2_1911) AND NOT FIREABLE(T-lb_no_balance_138)) OR NOT FIREABLE(T-lb_route_to_1_1810) OR FIREABLE(T-lb_route_to_1_1043)))) : A (G (NOT FIREABLE(T-lb_route_to_1_3739))) : E (F ((FIREABLE(T-lb_route_to_2_3123) AND FIREABLE(T-lb_route_to_1_496) AND FIREABLE(T-lb_balance_to_1_2338) AND NOT FIREABLE(T-lb_balance_to_1_293)))) : E (F (((FIREABLE(T-lb_balance_to_1_552) OR FIREABLE(T-lb_route_to_1_3091)) AND (FIREABLE(T-lb_balance_to_1_551) OR FIREABLE(T-lb_balance_to_2_1513)) AND NOT FIREABLE(T-lb_balance_to_1_2082) AND (NOT FIREABLE(T-lb_route_to_2_2372) OR NOT FIREABLE(T-lb_balance_to_2_993) OR FIREABLE(T-lb_route_to_1_258))))) : A (G ((NOT FIREABLE(T-lb_balance_to_1_541) OR NOT FIREABLE(T-lb_route_to_2_1672)))) : E (F (FIREABLE(T-lb_balance_to_2_2277))) : A (G (((NOT FIREABLE(T-lb_route_to_1_3739) AND NOT FIREABLE(T-lb_route_to_1_3705)) OR (NOT FIREABLE(T-lb_no_balance_68) AND NOT FIREABLE(T-lb_balance_to_1_1051)) OR (NOT FIREABLE(T-lb_route_to_1_3773) AND FIREABLE(T-lb_balance_to_1_1826) AND FIREABLE(T-lb_route_to_2_2474))))) : E (F ((NOT FIREABLE(T-lb_route_to_1_2612) AND FIREABLE(T-lb_balance_to_2_3804) AND FIREABLE(T-lb_route_to_1_3261)))) : A (G ((NOT FIREABLE(T-lb_route_to_1_1828) OR NOT FIREABLE(T-lb_route_to_1_1043) OR (NOT FIREABLE(T-lb_route_to_2_3276) AND NOT FIREABLE(T-lb_balance_to_1_1575)) OR ((NOT FIREABLE(T-lb_route_to_2_3054) OR NOT FIREABLE(T-lb_route_to_1_2202)) AND (NOT FIREABLE(T-lb_route_to_1_871) OR FIREABLE(T-lb_balance_to_2_2275)))))) : A (G ((NOT FIREABLE(T-lb_balance_to_2_3546) OR NOT FIREABLE(T-lb_route_to_2_1996))))
lola: computing a collection of formulas
lola: RUNNING
lola: subprocess 0 will run for 221 seconds at most (--localtimelimit=-1)
lola: ========================================
lola: ...considering subproblem: A (G ((FIREABLE(T-lb_route_to_2_307) OR (NOT FIREABLE(T-lb_route_to_2_3447) AND NOT FIREABLE(T-lb_route_to_1_717)) OR FIREABLE(T-lb_balance_to_2_2531))))
lola: ========================================
lola: SUBTASK
lola: checking invariance
lola: Planning: workflow for reachability check: stateequation||search (--findpath=off)
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 16 bytes per marking, with 18 unused bits
lola: using a prefix tree store (--store=prefix)
lola: SEARCH (state space)
lola: state space: using reachability graph (--search=depth)
lola: state space: using reachability preserving stubborn set method with insertion algorithm (--stubborn=tarjan)
lola: RUNNING
lola: state equation: Generated DNF with 120 literals and 24 conjunctive subformulas
lola: state equation: write sara problem file to SimpleLoadBal-PT-15-ReachabilityFireability.sara
lola: state equation: calling and running sara
sara: try reading problem file SimpleLoadBal-PT-15-ReachabilityFireability.sara.
sara: place or transition ordering is non-deterministic
lola: sara is running 0 secs || 39136 markings, 51187 edges, 7827 markings/sec, 0 secs
lola: sara is running 5 secs || 77819 markings, 102512 edges, 7737 markings/sec, 5 secs
lola: sara is running 10 secs || 116097 markings, 154643 edges, 7656 markings/sec, 10 secs
lola: sara is running 15 secs || 154516 markings, 206040 edges, 7684 markings/sec, 15 secs
lola: sara is running 20 secs || 192527 markings, 257219 edges, 7602 markings/sec, 20 secs
lola: sara is running 25 secs || 230636 markings, 308996 edges, 7622 markings/sec, 25 secs
lola: sara is running 30 secs || 268584 markings, 360786 edges, 7590 markings/sec, 30 secs
lola: sara is running 35 secs || 306358 markings, 412633 edges, 7555 markings/sec, 35 secs
lola: sara is running 40 secs || 344631 markings, 464051 edges, 7655 markings/sec, 40 secs
lola: sara is running 45 secs || 382331 markings, 516317 edges, 7540 markings/sec, 45 secs
lola: sara is running 50 secs || 419919 markings, 568913 edges, 7518 markings/sec, 50 secs
lola: sara is running 55 secs || 457439 markings, 620610 edges, 7504 markings/sec, 55 secs
lola: sara is running 60 secs || 495120 markings, 672178 edges, 7536 markings/sec, 60 secs
lola: sara is running 65 secs || 533051 markings, 723723 edges, 7586 markings/sec, 65 secs
lola: sara is running 70 secs || 570314 markings, 775585 edges, 7453 markings/sec, 70 secs
lola: sara is running 75 secs || 608822 markings, 826731 edges, 7702 markings/sec, 75 secs
lola: sara is running 80 secs || 647015 markings, 879214 edges, 7639 markings/sec, 80 secs
lola: sara is running 85 secs || 685391 markings, 932189 edges, 7675 markings/sec, 85 secs
lola: sara is running 90 secs || 723502 markings, 985075 edges, 7622 markings/sec, 90 secs
lola: sara is running 95 secs || 761755 markings, 1037892 edges, 7651 markings/sec, 95 secs
lola: sara is running 100 secs || 800086 markings, 1090662 edges, 7666 markings/sec, 100 secs
lola: sara is running 105 secs || 838121 markings, 1143269 edges, 7607 markings/sec, 105 secs
lola: sara is running 110 secs || 876246 markings, 1195367 edges, 7625 markings/sec, 110 secs
lola: sara is running 115 secs || 914433 markings, 1247217 edges, 7637 markings/sec, 115 secs
lola: sara is running 120 secs || 951988 markings, 1299351 edges, 7511 markings/sec, 120 secs
lola: sara is running 125 secs || 987921 markings, 1350113 edges, 7187 markings/sec, 125 secs
lola: sara is running 130 secs || 1024048 markings, 1400300 edges, 7225 markings/sec, 130 secs
lola: sara is running 135 secs || 1060706 markings, 1449974 edges, 7332 markings/sec, 135 secs
lola: sara is running 140 secs || 1096728 markings, 1500055 edges, 7204 markings/sec, 140 secs
lola: sara is running 145 secs || 1132859 markings, 1550233 edges, 7226 markings/sec, 145 secs
lola: sara is running 150 secs || 1168429 markings, 1599925 edges, 7114 markings/sec, 150 secs
lola: sara is running 155 secs || 1206834 markings, 1653311 edges, 7681 markings/sec, 155 secs
lola: sara is running 160 secs || 1245330 markings, 1706597 edges, 7699 markings/sec, 160 secs
lola: sara is running 165 secs || 1283722 markings, 1759869 edges, 7678 markings/sec, 165 secs
lola: sara is running 170 secs || 1322312 markings, 1812840 edges, 7718 markings/sec, 170 secs
lola: sara is running 175 secs || 1361300 markings, 1866228 edges, 7798 markings/sec, 175 secs
lola: sara is running 180 secs || 1399725 markings, 1919719 edges, 7685 markings/sec, 180 secs
lola: sara is running 185 secs || 1437274 markings, 1970755 edges, 7510 markings/sec, 185 secs
lola: sara is running 190 secs || 1472946 markings, 2019588 edges, 7134 markings/sec, 190 secs
lola: sara is running 195 secs || 1508084 markings, 2068799 edges, 7028 markings/sec, 195 secs
lola: sara is running 200 secs || 1542501 markings, 2116165 edges, 6883 markings/sec, 200 secs
lola: sara is running 205 secs || 1577381 markings, 2164734 edges, 6976 markings/sec, 205 secs
lola: sara is running 210 secs || 1614915 markings, 2214825 edges, 7507 markings/sec, 210 secs
lola: sara is running 215 secs || 1650925 markings, 2265208 edges, 7202 markings/sec, 215 secs
lola: local time limit reached - aborting
lola: Child process aborted or communication problem between parent and child process
terminate called after throwing an instance of 'std::runtime_error'
what(): parse error at position 0: unexpected character, last read: '!'
Aborted (core dumped)
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-0 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-1 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-2 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-3 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-4 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-5 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-6 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-7 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-8 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-9 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-10 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-11 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-12 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-13 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-14 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA SimpleLoadBal-PT-15-ReachabilityFireability-15 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
----- Kill lola and sara stdout -----
----- Kill lola and sara stderr -----
----- Finished stderr -----
----- Finished stdout -----

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="SimpleLoadBal-PT-15"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="irma4mcc-full"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"

# 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

tar xzf /home/mcc/BenchKit/INPUTS/SimpleLoadBal-PT-15.tgz
mv SimpleLoadBal-PT-15 execution
cd execution
pwd
ls -lh

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-3637"
echo " Executing tool irma4mcc-full"
echo " Input is SimpleLoadBal-PT-15, 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 r174-smll-152708744900168"
echo "====================================================================="
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
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 ;