Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2023-input.r377-smll-167891828200136.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
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=====================================================================
Generated by BenchKit 2-5348
Executing tool smartxred
Input is SafeBus-COL-10, examination is ReachabilityDeadlock
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r377-smll-167891828200136
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 456K
-rw-r--r-- 1 mcc users 6.5K Feb 26 01:40 CTLCardinality.txt
-rw-r--r-- 1 mcc users 67K Feb 26 01:40 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.9K Feb 26 01:37 CTLFireability.txt
-rw-r--r-- 1 mcc users 66K Feb 26 01:37 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.7K Feb 25 16:49 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Feb 25 16:49 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 16:49 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 16:49 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.8K Feb 26 01:52 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 97K Feb 26 01:52 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.0K Feb 26 01:51 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 53K Feb 26 01:51 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 16:49 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 16:49 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 equiv_pt
-rw-r--r-- 1 mcc users 3 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 42K Mar 5 18:23 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

FORMULA_NAME ReachabilityDeadlock

=== Now, execution of the tool begins

BK_START 1679090073882

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=smartxred
BK_EXAMINATION=ReachabilityDeadlock
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=SafeBus-COL-10
Applying reductions before tool smart
Invoking reducer
Running Version 202303021504
[2023-03-17 21:54:37] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityDeadlock, -timeout, 180, -rebuildPNML]
[2023-03-17 21:54:37] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-17 21:54:37] [INFO ] Detected file is not PT type :http://www.pnml.org/version-2009/grammar/symmetricnet
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2023-03-17 21:54:37] [WARNING] Using fallBack plugin, rng conformance not checked
[2023-03-17 21:54:38] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 1056 ms
[2023-03-17 21:54:38] [INFO ] Detected 1 constant HL places corresponding to 10 PT places.
[2023-03-17 21:54:38] [INFO ] Imported 20 HL places and 14 HL transitions for a total of 326 PT places and 12821.0 transition bindings in 39 ms.
Parsed 1 properties from file /home/mcc/execution/ReachabilityDeadlock.xml in 3 ms.
Working with output stream class java.io.PrintStream
[2023-03-17 21:54:38] [INFO ] Built PT skeleton of HLPN with 20 places and 14 transitions 68 arcs in 7 ms.
[2023-03-17 21:54:38] [INFO ] Skeletonized 1 HLPN properties in 0 ms.
Reduce places removed 3 places and 0 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Prefix of Interest using HLPN skeleton for deadlock discarded 0 places and 0 transitions.
Domain [It(10), It(10)] of place AMC breaks symmetries in sort It
[2023-03-17 21:54:38] [INFO ] Unfolded HLPN to a Petri net with 326 places and 1651 transitions 11294 arcs in 114 ms.
[2023-03-17 21:54:38] [INFO ] Unfolded 1 HLPN properties in 1 ms.
Deduced a syphon composed of 10 places in 9 ms
Reduce places removed 20 places and 20 transitions.
Built sparse matrix representations for Structural reductions in 4 ms.26863KB memory used
Starting structural reductions in DEADLOCK mode, iteration 0 : 306/306 places, 1631/1631 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 550 ms. Remains 306 /306 variables (removed 0) and now considering 1631/1631 (removed 0) transitions.
Finished structural reductions in DEADLOCK mode , in 1 iterations and 561 ms. Remains : 306/306 places, 1631/1631 transitions.
Starting structural reductions in DEADLOCK mode, iteration 0 : 306/306 places, 1631/1631 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 178 ms. Remains 306 /306 variables (removed 0) and now considering 1631/1631 (removed 0) transitions.
[2023-03-17 21:54:39] [INFO ] Flow matrix only has 642 transitions (discarded 989 similar events)
// Phase 1: matrix 642 rows 306 cols
[2023-03-17 21:54:39] [INFO ] Computed 45 place invariants in 77 ms
[2023-03-17 21:54:40] [INFO ] Implicit Places using invariants in 1234 ms returned [231, 232, 233, 234, 235, 236, 237, 238, 239, 240]
Discarding 10 places :
Implicit Place search using SMT only with invariants took 1281 ms to find 10 implicit places.
Starting structural reductions in DEADLOCK mode, iteration 1 : 296/306 places, 1631/1631 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Performed 10 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 0 with 10 Pre rules applied. Total rules applied 0 place count 296 transition count 1621
Deduced a syphon composed of 10 places in 2 ms
Reduce places removed 10 places and 0 transitions.
Iterating global reduction 0 with 20 rules applied. Total rules applied 20 place count 286 transition count 1621
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 20 rules in 245 ms. Remains 286 /296 variables (removed 10) and now considering 1621/1631 (removed 10) transitions.
[2023-03-17 21:54:40] [INFO ] Flow matrix only has 632 transitions (discarded 989 similar events)
// Phase 1: matrix 632 rows 286 cols
[2023-03-17 21:54:40] [INFO ] Computed 35 place invariants in 22 ms
[2023-03-17 21:54:41] [INFO ] Implicit Places using invariants in 660 ms returned []
[2023-03-17 21:54:41] [INFO ] Flow matrix only has 632 transitions (discarded 989 similar events)
[2023-03-17 21:54:41] [INFO ] Invariant cache hit.
[2023-03-17 21:54:41] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 21:54:45] [INFO ] Implicit Places using invariants and state equation in 3449 ms returned []
Implicit Place search using SMT with State Equation took 4112 ms to find 0 implicit places.
Starting structural reductions in DEADLOCK mode, iteration 2 : 286/306 places, 1621/1631 transitions.
Finished structural reductions in DEADLOCK mode , in 2 iterations and 5816 ms. Remains : 286/306 places, 1621/1631 transitions.
Random walk for 1250000 steps, including 0 resets, run took 8899 ms (no deadlock found). (steps per millisecond=140 )
Random directed walk for 1250001 steps, including 0 resets, run took 8690 ms (no deadlock found). (steps per millisecond=143 )
[2023-03-17 21:55:02] [INFO ] Flow matrix only has 632 transitions (discarded 989 similar events)
[2023-03-17 21:55:02] [INFO ] Invariant cache hit.
[2023-03-17 21:55:03] [INFO ] [Real]Absence check using 14 positive place invariants in 23 ms returned sat
[2023-03-17 21:55:03] [INFO ] [Real]Absence check using 14 positive and 21 generalized place invariants in 537 ms returned sat
[2023-03-17 21:55:03] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-17 21:55:04] [INFO ] [Real]Absence check using state equation in 403 ms returned sat
[2023-03-17 21:55:04] [INFO ] Solution in real domain found non-integer solution.
[2023-03-17 21:55:04] [INFO ] [Nat]Absence check using 14 positive place invariants in 12 ms returned sat
[2023-03-17 21:55:04] [INFO ] [Nat]Absence check using 14 positive and 21 generalized place invariants in 98 ms returned sat
[2023-03-17 21:55:04] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-17 21:55:05] [INFO ] [Nat]Absence check using state equation in 501 ms returned sat
[2023-03-17 21:55:05] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 21:55:05] [INFO ] [Nat]Added 111 Read/Feed constraints in 631 ms returned sat
[2023-03-17 21:55:06] [INFO ] Deduced a trap composed of 49 places in 168 ms of which 4 ms to minimize.
[2023-03-17 21:55:06] [INFO ] Deduced a trap composed of 41 places in 229 ms of which 1 ms to minimize.
[2023-03-17 21:55:07] [INFO ] Deduced a trap composed of 41 places in 131 ms of which 2 ms to minimize.
[2023-03-17 21:55:07] [INFO ] Deduced a trap composed of 49 places in 172 ms of which 1 ms to minimize.
[2023-03-17 21:55:08] [INFO ] Deduced a trap composed of 49 places in 163 ms of which 1 ms to minimize.
[2023-03-17 21:55:08] [INFO ] Deduced a trap composed of 41 places in 172 ms of which 1 ms to minimize.
[2023-03-17 21:55:08] [INFO ] Deduced a trap composed of 41 places in 176 ms of which 1 ms to minimize.
[2023-03-17 21:55:08] [INFO ] Deduced a trap composed of 41 places in 174 ms of which 1 ms to minimize.
[2023-03-17 21:55:09] [INFO ] Deduced a trap composed of 41 places in 179 ms of which 1 ms to minimize.
[2023-03-17 21:55:09] [INFO ] Deduced a trap composed of 41 places in 181 ms of which 1 ms to minimize.
[2023-03-17 21:55:09] [INFO ] Trap strengthening (SAT) tested/added 11/10 trap constraints in 3542 ms
[2023-03-17 21:55:09] [INFO ] Computed and/alt/rep : 20/30/20 causal constraints (skipped 602 transitions) in 260 ms.
[2023-03-17 21:55:09] [INFO ] Added : 2 causal constraints over 2 iterations in 491 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 11 ms.
Parikh directed walk for 30600 steps, including 1000 resets, run took 465 ms. (steps per millisecond=65 )
Random directed walk for 500003 steps, including 0 resets, run took 2798 ms (no deadlock found). (steps per millisecond=178 )
Random walk for 500000 steps, including 0 resets, run took 3621 ms (no deadlock found). (steps per millisecond=138 )
Random directed walk for 500001 steps, including 0 resets, run took 2624 ms (no deadlock found). (steps per millisecond=190 )
Random walk for 500000 steps, including 0 resets, run took 4010 ms (no deadlock found). (steps per millisecond=124 )
Starting structural reductions in DEADLOCK mode, iteration 0 : 286/286 places, 1621/1621 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 248 ms. Remains 286 /286 variables (removed 0) and now considering 1621/1621 (removed 0) transitions.
[2023-03-17 21:55:23] [INFO ] Flow matrix only has 632 transitions (discarded 989 similar events)
[2023-03-17 21:55:23] [INFO ] Invariant cache hit.
[2023-03-17 21:55:24] [INFO ] Implicit Places using invariants in 830 ms returned []
[2023-03-17 21:55:24] [INFO ] Flow matrix only has 632 transitions (discarded 989 similar events)
[2023-03-17 21:55:24] [INFO ] Invariant cache hit.
[2023-03-17 21:55:24] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 21:55:27] [INFO ] Implicit Places using invariants and state equation in 2865 ms returned []
Implicit Place search using SMT with State Equation took 3698 ms to find 0 implicit places.
[2023-03-17 21:55:27] [INFO ] Redundant transitions in 215 ms returned []
[2023-03-17 21:55:27] [INFO ] Flow matrix only has 632 transitions (discarded 989 similar events)
[2023-03-17 21:55:27] [INFO ] Invariant cache hit.
[2023-03-17 21:55:29] [INFO ] Dead Transitions using invariants and state equation in 1658 ms found 100 transitions.
Found 100 dead transitions using SMT.
Drop transitions removed 100 transitions
Dead transitions reduction (with SMT) removed 100 transitions
Starting structural reductions in DEADLOCK mode, iteration 1 : 286/286 places, 1521/1621 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 182 ms. Remains 286 /286 variables (removed 0) and now considering 1521/1521 (removed 0) transitions.
[2023-03-17 21:55:29] [INFO ] Redundant transitions in 69 ms returned []
Finished structural reductions in DEADLOCK mode , in 2 iterations and 6092 ms. Remains : 286/286 places, 1521/1621 transitions.
Random walk for 1250000 steps, including 0 resets, run took 8132 ms (no deadlock found). (steps per millisecond=153 )
Random directed walk for 1250000 steps, including 0 resets, run took 5762 ms (no deadlock found). (steps per millisecond=216 )
[2023-03-17 21:55:43] [INFO ] Flow matrix only has 632 transitions (discarded 889 similar events)
[2023-03-17 21:55:43] [INFO ] Invariant cache hit.
[2023-03-17 21:55:43] [INFO ] [Real]Absence check using 14 positive place invariants in 14 ms returned sat
[2023-03-17 21:55:44] [INFO ] [Real]Absence check using 14 positive and 21 generalized place invariants in 595 ms returned sat
[2023-03-17 21:55:44] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-17 21:55:44] [INFO ] [Real]Absence check using state equation in 474 ms returned sat
[2023-03-17 21:55:44] [INFO ] Solution in real domain found non-integer solution.
[2023-03-17 21:55:45] [INFO ] [Nat]Absence check using 14 positive place invariants in 13 ms returned sat
[2023-03-17 21:55:45] [INFO ] [Nat]Absence check using 14 positive and 21 generalized place invariants in 30 ms returned sat
[2023-03-17 21:55:45] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-17 21:55:45] [INFO ] [Nat]Absence check using state equation in 659 ms returned sat
[2023-03-17 21:55:45] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 21:55:46] [INFO ] [Nat]Added 111 Read/Feed constraints in 284 ms returned sat
[2023-03-17 21:55:46] [INFO ] Deduced a trap composed of 41 places in 110 ms of which 1 ms to minimize.
[2023-03-17 21:55:46] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 446 ms
[2023-03-17 21:55:46] [INFO ] Computed and/alt/rep : 20/30/20 causal constraints (skipped 602 transitions) in 119 ms.
[2023-03-17 21:55:46] [INFO ] Added : 1 causal constraints over 1 iterations in 292 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 10 ms.
Parikh directed walk for 28000 steps, including 1000 resets, run took 346 ms. (steps per millisecond=80 )
Random directed walk for 500000 steps, including 0 resets, run took 2308 ms (no deadlock found). (steps per millisecond=216 )
Random walk for 500000 steps, including 0 resets, run took 3149 ms (no deadlock found). (steps per millisecond=158 )
Random directed walk for 500000 steps, including 0 resets, run took 2310 ms (no deadlock found). (steps per millisecond=216 )
Random walk for 500000 steps, including 0 resets, run took 3151 ms (no deadlock found). (steps per millisecond=158 )
[2023-03-17 21:55:58] [INFO ] Flatten gal took : 342 ms
[2023-03-17 21:55:58] [INFO ] Export to MCC of 1 properties in file /home/mcc/execution/ReachabilityDeadlock.sr.xml took 1 ms.
[2023-03-17 21:55:58] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 306 places, 1631 transitions and 11204 arcs took 18 ms.
Total runtime 81547 ms.
There are residual formulas that ITS could not solve within timeout
======================================================
========== this is Smart for the MCC'2018 ============
======================================================
Running SafeBus (COL), instance 10
Examination ReachabilityDeadlock
Parser /home/mcc/BenchKit/bin//../reducer/bin//../../smart/bin//parser/DeadlockParse.jar
Model checker /home/mcc/BenchKit/bin//../reducer/bin//../../smart/bin//rem_exec//smart

PNML FILE: model.pnml
Petri model created: 306 places, 1631 transitions, 11204 arcs.
TIME LIMIT: Killed by timeout after 1800 seconds
MemTotal: 16393232 kB
MemFree: 14498748 kB
After kill :
MemTotal: 16393232 kB
MemFree: 16117728 kB

BK_TIME_CONFINEMENT_REACHED

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

+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityDeadlock -timeout 180 -rebuildPNML
Caught signal 15, terminating.

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="SafeBus-COL-10"
export BK_EXAMINATION="ReachabilityDeadlock"
export BK_TOOL="smartxred"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"

# this is specific to your benchmark or test

export BIN_DIR="$HOME/BenchKit/bin"

# remove the execution directoty if it exists (to avoid increse of .vmdk images)
if [ -d execution ] ; then
rm -rf execution
fi

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-5348"
echo " Executing tool smartxred"
echo " Input is SafeBus-COL-10, examination is ReachabilityDeadlock"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r377-smll-167891828200136"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/SafeBus-COL-10.tgz
mv SafeBus-COL-10 execution
cd execution
if [ "ReachabilityDeadlock" = "ReachabilityDeadlock" ] || [ "ReachabilityDeadlock" = "UpperBounds" ] || [ "ReachabilityDeadlock" = "QuasiLiveness" ] || [ "ReachabilityDeadlock" = "StableMarking" ] || [ "ReachabilityDeadlock" = "Liveness" ] || [ "ReachabilityDeadlock" = "OneSafe" ] || [ "ReachabilityDeadlock" = "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 [ "ReachabilityDeadlock" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityDeadlock" != "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 "ReachabilityDeadlock.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityDeadlock.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityDeadlock.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 '' ReachabilityDeadlock.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityDeadlock" = "ReachabilityDeadlock" ] || [ "ReachabilityDeadlock" = "QuasiLiveness" ] || [ "ReachabilityDeadlock" = "StableMarking" ] || [ "ReachabilityDeadlock" = "Liveness" ] || [ "ReachabilityDeadlock" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityDeadlock"
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 ;