/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c


--------------------------------------------------------------------------------


This is Ultimate 0.1.25-d623d84
[2020-07-20 10:59:58,705 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-07-20 10:59:58,709 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
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[2020-07-20 10:59:58,732 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-20 10:59:58,734 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-20 10:59:58,736 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
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[2020-07-20 10:59:58,768 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-20 10:59:58,770 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-20 10:59:58,771 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-20 10:59:58,773 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-20 10:59:58,779 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-20 10:59:58,785 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-20 10:59:58,791 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-20 10:59:58,793 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-07-20 10:59:58,794 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-20 10:59:58,796 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
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[2020-07-20 10:59:58,797 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
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[2020-07-20 10:59:58,810 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
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[2020-07-20 10:59:58,812 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-07-20 10:59:58,813 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-07-20 10:59:58,856 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-07-20 10:59:58,856 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-20 10:59:58,857 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-20 10:59:58,858 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-07-20 10:59:58,858 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-07-20 10:59:58,858 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-20 10:59:58,858 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-07-20 10:59:58,858 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-07-20 10:59:58,859 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-07-20 10:59:58,859 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-07-20 10:59:58,859 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-07-20 10:59:58,862 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-20 10:59:58,863 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-07-20 10:59:58,863 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-07-20 10:59:58,863 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-07-20 10:59:58,863 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-07-20 10:59:58,864 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-07-20 10:59:58,865 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-20 10:59:58,865 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-07-20 10:59:58,865 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-07-20 10:59:58,865 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-07-20 10:59:58,866 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 10:59:58,866 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-20 10:59:58,866 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-07-20 10:59:58,866 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-20 10:59:58,866 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-07-20 10:59:58,867 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 10:59:58,867 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-20 10:59:58,867 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-07-20 10:59:58,869 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> NOT_INCREMENTALLY
[2020-07-20 10:59:59,207 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-20 10:59:59,223 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-20 10:59:59,228 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-20 10:59:59,229 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-07-20 10:59:59,232 INFO  L275        PluginConnector]: CDTParser initialized
[2020-07-20 10:59:59,234 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-2.c
[2020-07-20 10:59:59,304 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19e05ccc4/79d17641797f4cbaa1f7ca5fb3d78cb2/FLAG11eb36e03
[2020-07-20 10:59:59,761 INFO  L306              CDTParser]: Found 1 translation units.
[2020-07-20 10:59:59,761 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-2.c
[2020-07-20 10:59:59,769 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19e05ccc4/79d17641797f4cbaa1f7ca5fb3d78cb2/FLAG11eb36e03
[2020-07-20 11:00:00,194 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/19e05ccc4/79d17641797f4cbaa1f7ca5fb3d78cb2
[2020-07-20 11:00:00,207 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-20 11:00:00,211 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-20 11:00:00,217 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-20 11:00:00,217 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-20 11:00:00,221 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-20 11:00:00,222 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,225 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d095aab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00, skipping insertion in model container
[2020-07-20 11:00:00,225 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,235 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-07-20 11:00:00,256 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-07-20 11:00:00,425 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 11:00:00,430 INFO  L203         MainTranslator]: Completed pre-run
[2020-07-20 11:00:00,446 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-07-20 11:00:00,459 INFO  L208         MainTranslator]: Completed translation
[2020-07-20 11:00:00,460 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00 WrapperNode
[2020-07-20 11:00:00,460 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-20 11:00:00,461 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-20 11:00:00,461 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-20 11:00:00,461 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-07-20 11:00:00,472 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,472 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,478 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,478 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,482 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,485 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,486 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
[2020-07-20 11:00:00,487 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-20 11:00:00,488 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-20 11:00:00,488 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-07-20 11:00:00,488 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-07-20 11:00:00,489 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (1/1) ...
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-20 11:00:00,638 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-20 11:00:00,638 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-20 11:00:00,639 INFO  L138     BoogieDeclarations]: Found implementation of procedure fibo
[2020-07-20 11:00:00,639 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-07-20 11:00:00,639 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-20 11:00:00,639 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-20 11:00:00,639 INFO  L130     BoogieDeclarations]: Found specification of procedure fibo
[2020-07-20 11:00:00,640 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-07-20 11:00:00,640 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-20 11:00:00,640 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-20 11:00:00,833 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-20 11:00:00,833 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-07-20 11:00:00,838 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:00 BoogieIcfgContainer
[2020-07-20 11:00:00,838 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-20 11:00:00,839 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-20 11:00:00,840 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-07-20 11:00:00,843 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-07-20 11:00:00,844 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:00:00" (1/3) ...
[2020-07-20 11:00:00,845 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4019d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:00, skipping insertion in model container
[2020-07-20 11:00:00,845 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:00:00" (2/3) ...
[2020-07-20 11:00:00,845 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4019d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:00:00, skipping insertion in model container
[2020-07-20 11:00:00,846 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:00:00" (3/3) ...
[2020-07-20 11:00:00,848 INFO  L109   eAbstractionObserver]: Analyzing ICFG fibo_15-2.c
[2020-07-20 11:00:00,862 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-20 11:00:00,871 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-20 11:00:00,892 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-20 11:00:00,926 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-07-20 11:00:00,927 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-07-20 11:00:00,927 INFO  L377      AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-20 11:00:00,927 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-20 11:00:00,928 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-20 11:00:00,928 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-07-20 11:00:00,928 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-20 11:00:00,928 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-20 11:00:00,954 INFO  L276                IsEmpty]: Start isEmpty. Operand 24 states.
[2020-07-20 11:00:00,962 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2020-07-20 11:00:00,962 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:00,963 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:00,964 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:00,971 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:00,972 INFO  L82        PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times
[2020-07-20 11:00:00,983 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:00,984 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1250464864]
[2020-07-20 11:00:00,984 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:01,060 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:01,064 INFO  L263         TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 11:00:01,070 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:01,179 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 11:00:01,180 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 11:00:01,181 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1250464864]
[2020-07-20 11:00:01,182 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 11:00:01,182 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-20 11:00:01,183 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272666724]
[2020-07-20 11:00:01,188 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-20 11:00:01,188 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:01,199 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-20 11:00:01,199 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 11:00:01,202 INFO  L87              Difference]: Start difference. First operand 24 states. Second operand 5 states.
[2020-07-20 11:00:01,314 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:01,315 INFO  L93              Difference]: Finished difference Result 35 states and 41 transitions.
[2020-07-20 11:00:01,315 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 11:00:01,317 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 13
[2020-07-20 11:00:01,318 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:01,328 INFO  L225             Difference]: With dead ends: 35
[2020-07-20 11:00:01,328 INFO  L226             Difference]: Without dead ends: 21
[2020-07-20 11:00:01,332 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-07-20 11:00:01,350 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 21 states.
[2020-07-20 11:00:01,377 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21.
[2020-07-20 11:00:01,379 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 21 states.
[2020-07-20 11:00:01,381 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions.
[2020-07-20 11:00:01,383 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13
[2020-07-20 11:00:01,383 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:01,383 INFO  L479      AbstractCegarLoop]: Abstraction has 21 states and 25 transitions.
[2020-07-20 11:00:01,384 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-20 11:00:01,384 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions.
[2020-07-20 11:00:01,386 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2020-07-20 11:00:01,386 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:01,387 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:01,600 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:01,601 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:01,601 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:01,602 INFO  L82        PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times
[2020-07-20 11:00:01,602 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:01,603 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011518108]
[2020-07-20 11:00:01,603 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:01,628 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:01,629 INFO  L263         TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core
[2020-07-20 11:00:01,631 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:01,676 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-20 11:00:01,676 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-20 11:00:01,677 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011518108]
[2020-07-20 11:00:01,677 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-20 11:00:01,677 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2020-07-20 11:00:01,678 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299232009]
[2020-07-20 11:00:01,680 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 5 states
[2020-07-20 11:00:01,681 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:01,681 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2020-07-20 11:00:01,682 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2020-07-20 11:00:01,682 INFO  L87              Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states.
[2020-07-20 11:00:01,774 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:01,774 INFO  L93              Difference]: Finished difference Result 27 states and 32 transitions.
[2020-07-20 11:00:01,775 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-07-20 11:00:01,775 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 14
[2020-07-20 11:00:01,775 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:01,776 INFO  L225             Difference]: With dead ends: 27
[2020-07-20 11:00:01,777 INFO  L226             Difference]: Without dead ends: 23
[2020-07-20 11:00:01,778 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2020-07-20 11:00:01,779 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23 states.
[2020-07-20 11:00:01,785 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21.
[2020-07-20 11:00:01,785 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 21 states.
[2020-07-20 11:00:01,786 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions.
[2020-07-20 11:00:01,787 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14
[2020-07-20 11:00:01,787 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:01,787 INFO  L479      AbstractCegarLoop]: Abstraction has 21 states and 25 transitions.
[2020-07-20 11:00:01,787 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2020-07-20 11:00:01,788 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions.
[2020-07-20 11:00:01,789 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2020-07-20 11:00:01,789 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:01,789 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:02,003 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:02,004 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:02,004 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:02,005 INFO  L82        PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times
[2020-07-20 11:00:02,005 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:02,005 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [32198308]
[2020-07-20 11:00:02,006 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:02,039 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:02,040 INFO  L263         TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 11:00:02,043 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:02,091 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2020-07-20 11:00:02,092 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:02,289 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:02,339 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2020-07-20 11:00:02,340 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [32198308]
[2020-07-20 11:00:02,340 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:02,341 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9
[2020-07-20 11:00:02,341 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471275394]
[2020-07-20 11:00:02,342 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-07-20 11:00:02,342 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:02,342 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-07-20 11:00:02,343 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72
[2020-07-20 11:00:02,343 INFO  L87              Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states.
[2020-07-20 11:00:02,461 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:02,461 INFO  L93              Difference]: Finished difference Result 32 states and 42 transitions.
[2020-07-20 11:00:02,462 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-07-20 11:00:02,462 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 26
[2020-07-20 11:00:02,463 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:02,464 INFO  L225             Difference]: With dead ends: 32
[2020-07-20 11:00:02,465 INFO  L226             Difference]: Without dead ends: 28
[2020-07-20 11:00:02,465 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110
[2020-07-20 11:00:02,466 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28 states.
[2020-07-20 11:00:02,473 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26.
[2020-07-20 11:00:02,473 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 26 states.
[2020-07-20 11:00:02,475 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions.
[2020-07-20 11:00:02,476 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26
[2020-07-20 11:00:02,476 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:02,476 INFO  L479      AbstractCegarLoop]: Abstraction has 26 states and 34 transitions.
[2020-07-20 11:00:02,476 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-07-20 11:00:02,477 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions.
[2020-07-20 11:00:02,478 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 28
[2020-07-20 11:00:02,478 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:02,478 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:02,693 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:02,694 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:02,695 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:02,695 INFO  L82        PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times
[2020-07-20 11:00:02,695 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:02,696 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952162454]
[2020-07-20 11:00:02,696 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:02,724 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:02,725 INFO  L263         TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core
[2020-07-20 11:00:02,727 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:02,789 INFO  L134       CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2020-07-20 11:00:02,789 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:02,959 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:03,013 INFO  L134       CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2020-07-20 11:00:03,015 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952162454]
[2020-07-20 11:00:03,016 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:03,016 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9
[2020-07-20 11:00:03,016 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434355017]
[2020-07-20 11:00:03,018 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-07-20 11:00:03,018 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:03,018 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-07-20 11:00:03,020 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72
[2020-07-20 11:00:03,020 INFO  L87              Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states.
[2020-07-20 11:00:03,139 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:03,139 INFO  L93              Difference]: Finished difference Result 37 states and 54 transitions.
[2020-07-20 11:00:03,142 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2020-07-20 11:00:03,142 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 27
[2020-07-20 11:00:03,143 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:03,148 INFO  L225             Difference]: With dead ends: 37
[2020-07-20 11:00:03,148 INFO  L226             Difference]: Without dead ends: 33
[2020-07-20 11:00:03,149 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110
[2020-07-20 11:00:03,150 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 33 states.
[2020-07-20 11:00:03,165 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26.
[2020-07-20 11:00:03,166 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 26 states.
[2020-07-20 11:00:03,168 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions.
[2020-07-20 11:00:03,168 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27
[2020-07-20 11:00:03,168 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:03,169 INFO  L479      AbstractCegarLoop]: Abstraction has 26 states and 34 transitions.
[2020-07-20 11:00:03,169 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-07-20 11:00:03,169 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions.
[2020-07-20 11:00:03,173 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 40
[2020-07-20 11:00:03,174 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:03,174 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:03,389 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:03,391 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:03,391 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:03,392 INFO  L82        PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times
[2020-07-20 11:00:03,392 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:03,393 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269982633]
[2020-07-20 11:00:03,393 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:03,422 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:03,423 INFO  L263         TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 11:00:03,426 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:03,484 INFO  L134       CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked.
[2020-07-20 11:00:03,484 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:03,780 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:03,782 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:03,839 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:03,841 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:03,891 INFO  L134       CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked.
[2020-07-20 11:00:03,891 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269982633]
[2020-07-20 11:00:03,891 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:03,892 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11
[2020-07-20 11:00:03,892 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618548338]
[2020-07-20 11:00:03,892 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-07-20 11:00:03,893 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:03,893 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-07-20 11:00:03,893 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110
[2020-07-20 11:00:03,894 INFO  L87              Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states.
[2020-07-20 11:00:04,050 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:04,051 INFO  L93              Difference]: Finished difference Result 42 states and 68 transitions.
[2020-07-20 11:00:04,051 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-07-20 11:00:04,051 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 39
[2020-07-20 11:00:04,052 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:04,053 INFO  L225             Difference]: With dead ends: 42
[2020-07-20 11:00:04,054 INFO  L226             Difference]: Without dead ends: 38
[2020-07-20 11:00:04,054 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182
[2020-07-20 11:00:04,055 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 38 states.
[2020-07-20 11:00:04,063 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31.
[2020-07-20 11:00:04,064 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-07-20 11:00:04,065 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions.
[2020-07-20 11:00:04,065 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39
[2020-07-20 11:00:04,066 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:04,066 INFO  L479      AbstractCegarLoop]: Abstraction has 31 states and 45 transitions.
[2020-07-20 11:00:04,066 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-07-20 11:00:04,066 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions.
[2020-07-20 11:00:04,068 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 42
[2020-07-20 11:00:04,068 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:04,069 INFO  L422         BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:04,281 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:04,282 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:04,283 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:04,283 INFO  L82        PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times
[2020-07-20 11:00:04,283 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:04,284 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1597837093]
[2020-07-20 11:00:04,284 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:04,318 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:04,319 INFO  L263         TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core
[2020-07-20 11:00:04,323 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:04,369 INFO  L134       CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked.
[2020-07-20 11:00:04,369 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:04,616 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:04,668 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:04,670 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:04,705 INFO  L134       CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked.
[2020-07-20 11:00:04,705 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1597837093]
[2020-07-20 11:00:04,706 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:04,706 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11
[2020-07-20 11:00:04,706 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252440346]
[2020-07-20 11:00:04,707 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-07-20 11:00:04,707 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:04,707 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-07-20 11:00:04,708 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110
[2020-07-20 11:00:04,708 INFO  L87              Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states.
[2020-07-20 11:00:04,865 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:04,866 INFO  L93              Difference]: Finished difference Result 47 states and 84 transitions.
[2020-07-20 11:00:04,866 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2020-07-20 11:00:04,866 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 41
[2020-07-20 11:00:04,867 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:04,869 INFO  L225             Difference]: With dead ends: 47
[2020-07-20 11:00:04,876 INFO  L226             Difference]: Without dead ends: 43
[2020-07-20 11:00:04,877 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182
[2020-07-20 11:00:04,878 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 43 states.
[2020-07-20 11:00:04,900 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31.
[2020-07-20 11:00:04,900 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 31 states.
[2020-07-20 11:00:04,901 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions.
[2020-07-20 11:00:04,902 INFO  L78                 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41
[2020-07-20 11:00:04,904 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:04,905 INFO  L479      AbstractCegarLoop]: Abstraction has 31 states and 45 transitions.
[2020-07-20 11:00:04,905 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-07-20 11:00:04,905 INFO  L276                IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions.
[2020-07-20 11:00:04,907 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 66
[2020-07-20 11:00:04,907 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:04,907 INFO  L422         BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:05,122 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:05,123 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:05,124 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:05,124 INFO  L82        PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times
[2020-07-20 11:00:05,124 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:05,125 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873558661]
[2020-07-20 11:00:05,125 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:05,164 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:05,166 INFO  L263         TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core
[2020-07-20 11:00:05,169 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:05,237 INFO  L134       CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked.
[2020-07-20 11:00:05,238 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:05,688 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:05,798 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:05,799 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:05,864 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:05,866 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:05,917 INFO  L134       CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked.
[2020-07-20 11:00:05,917 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873558661]
[2020-07-20 11:00:05,917 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:05,917 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13
[2020-07-20 11:00:05,918 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273628358]
[2020-07-20 11:00:05,919 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-07-20 11:00:05,919 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:05,919 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-07-20 11:00:05,920 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156
[2020-07-20 11:00:05,920 INFO  L87              Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states.
[2020-07-20 11:00:06,123 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:06,124 INFO  L93              Difference]: Finished difference Result 52 states and 102 transitions.
[2020-07-20 11:00:06,124 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 11:00:06,124 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 65
[2020-07-20 11:00:06,125 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:06,127 INFO  L225             Difference]: With dead ends: 52
[2020-07-20 11:00:06,127 INFO  L226             Difference]: Without dead ends: 48
[2020-07-20 11:00:06,128 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272
[2020-07-20 11:00:06,129 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 48 states.
[2020-07-20 11:00:06,138 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36.
[2020-07-20 11:00:06,138 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 36 states.
[2020-07-20 11:00:06,140 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions.
[2020-07-20 11:00:06,140 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65
[2020-07-20 11:00:06,140 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:06,140 INFO  L479      AbstractCegarLoop]: Abstraction has 36 states and 58 transitions.
[2020-07-20 11:00:06,141 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-07-20 11:00:06,141 INFO  L276                IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions.
[2020-07-20 11:00:06,144 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 97
[2020-07-20 11:00:06,145 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:06,145 INFO  L422         BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:06,355 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:06,355 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:06,356 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:06,356 INFO  L82        PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times
[2020-07-20 11:00:06,357 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:06,357 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845645674]
[2020-07-20 11:00:06,358 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:06,419 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:06,420 INFO  L263         TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core
[2020-07-20 11:00:06,423 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:06,490 INFO  L134       CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked.
[2020-07-20 11:00:06,491 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:06,938 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:07,043 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:07,044 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:07,093 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:07,142 INFO  L134       CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked.
[2020-07-20 11:00:07,143 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845645674]
[2020-07-20 11:00:07,143 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:07,143 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13
[2020-07-20 11:00:07,144 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651389589]
[2020-07-20 11:00:07,144 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-07-20 11:00:07,145 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:07,145 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-07-20 11:00:07,145 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156
[2020-07-20 11:00:07,145 INFO  L87              Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states.
[2020-07-20 11:00:07,295 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:07,296 INFO  L93              Difference]: Finished difference Result 57 states and 122 transitions.
[2020-07-20 11:00:07,296 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-07-20 11:00:07,297 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 96
[2020-07-20 11:00:07,297 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:07,299 INFO  L225             Difference]: With dead ends: 57
[2020-07-20 11:00:07,299 INFO  L226             Difference]: Without dead ends: 53
[2020-07-20 11:00:07,301 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272
[2020-07-20 11:00:07,301 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 53 states.
[2020-07-20 11:00:07,323 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36.
[2020-07-20 11:00:07,324 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 36 states.
[2020-07-20 11:00:07,325 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions.
[2020-07-20 11:00:07,325 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96
[2020-07-20 11:00:07,325 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:07,326 INFO  L479      AbstractCegarLoop]: Abstraction has 36 states and 58 transitions.
[2020-07-20 11:00:07,326 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-07-20 11:00:07,326 INFO  L276                IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions.
[2020-07-20 11:00:07,328 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 118
[2020-07-20 11:00:07,328 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:07,329 INFO  L422         BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:07,542 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:07,542 INFO  L427      AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:07,543 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:07,543 INFO  L82        PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times
[2020-07-20 11:00:07,543 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:07,544 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717629065]
[2020-07-20 11:00:07,544 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:07,616 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:07,618 INFO  L263         TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 11:00:07,632 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:07,734 INFO  L134       CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked.
[2020-07-20 11:00:07,735 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:08,338 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:08,339 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:08,534 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:08,624 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:08,682 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:08,734 INFO  L134       CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked.
[2020-07-20 11:00:08,734 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717629065]
[2020-07-20 11:00:08,734 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:08,735 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15
[2020-07-20 11:00:08,735 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945269223]
[2020-07-20 11:00:08,735 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 15 states
[2020-07-20 11:00:08,736 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:08,736 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants.
[2020-07-20 11:00:08,736 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210
[2020-07-20 11:00:08,737 INFO  L87              Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states.
[2020-07-20 11:00:09,041 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:09,041 INFO  L93              Difference]: Finished difference Result 62 states and 144 transitions.
[2020-07-20 11:00:09,042 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-07-20 11:00:09,042 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states. Word has length 117
[2020-07-20 11:00:09,043 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:09,044 INFO  L225             Difference]: With dead ends: 62
[2020-07-20 11:00:09,045 INFO  L226             Difference]: Without dead ends: 58
[2020-07-20 11:00:09,046 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380
[2020-07-20 11:00:09,046 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 58 states.
[2020-07-20 11:00:09,057 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41.
[2020-07-20 11:00:09,057 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 41 states.
[2020-07-20 11:00:09,059 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions.
[2020-07-20 11:00:09,059 INFO  L78                 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117
[2020-07-20 11:00:09,059 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:09,059 INFO  L479      AbstractCegarLoop]: Abstraction has 41 states and 73 transitions.
[2020-07-20 11:00:09,060 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 15 states.
[2020-07-20 11:00:09,060 INFO  L276                IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions.
[2020-07-20 11:00:09,062 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 191
[2020-07-20 11:00:09,063 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:09,063 INFO  L422         BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:09,277 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:09,278 INFO  L427      AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:09,278 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:09,278 INFO  L82        PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times
[2020-07-20 11:00:09,279 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:09,279 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [249352505]
[2020-07-20 11:00:09,279 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:09,371 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:09,373 INFO  L263         TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core
[2020-07-20 11:00:09,378 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:09,485 INFO  L134       CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked.
[2020-07-20 11:00:09,485 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:10,222 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:10,426 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:10,509 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:10,511 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:10,563 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:10,564 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:10,615 INFO  L134       CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked.
[2020-07-20 11:00:10,615 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [249352505]
[2020-07-20 11:00:10,616 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:10,616 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15
[2020-07-20 11:00:10,616 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860498814]
[2020-07-20 11:00:10,617 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 15 states
[2020-07-20 11:00:10,617 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:10,617 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants.
[2020-07-20 11:00:10,617 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210
[2020-07-20 11:00:10,618 INFO  L87              Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states.
[2020-07-20 11:00:10,798 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:10,798 INFO  L93              Difference]: Finished difference Result 67 states and 168 transitions.
[2020-07-20 11:00:10,799 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-07-20 11:00:10,799 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states. Word has length 190
[2020-07-20 11:00:10,800 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:10,805 INFO  L225             Difference]: With dead ends: 67
[2020-07-20 11:00:10,805 INFO  L226             Difference]: Without dead ends: 63
[2020-07-20 11:00:10,806 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380
[2020-07-20 11:00:10,807 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 63 states.
[2020-07-20 11:00:10,827 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41.
[2020-07-20 11:00:10,827 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 41 states.
[2020-07-20 11:00:10,830 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions.
[2020-07-20 11:00:10,831 INFO  L78                 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190
[2020-07-20 11:00:10,832 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:10,833 INFO  L479      AbstractCegarLoop]: Abstraction has 41 states and 73 transitions.
[2020-07-20 11:00:10,833 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 15 states.
[2020-07-20 11:00:10,833 INFO  L276                IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions.
[2020-07-20 11:00:10,838 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 287
[2020-07-20 11:00:10,838 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:10,840 INFO  L422         BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:11,054 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:11,055 INFO  L427      AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:11,056 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:11,056 INFO  L82        PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times
[2020-07-20 11:00:11,056 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:11,057 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472768612]
[2020-07-20 11:00:11,057 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:11,180 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:11,182 INFO  L263         TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core
[2020-07-20 11:00:11,188 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:11,322 INFO  L134       CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked.
[2020-07-20 11:00:11,322 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:12,555 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:12,887 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:13,049 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:13,137 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:13,189 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:13,190 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:13,312 INFO  L134       CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked.
[2020-07-20 11:00:13,313 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472768612]
[2020-07-20 11:00:13,313 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:13,314 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17
[2020-07-20 11:00:13,314 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795120367]
[2020-07-20 11:00:13,317 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-07-20 11:00:13,318 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:13,318 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-07-20 11:00:13,324 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272
[2020-07-20 11:00:13,324 INFO  L87              Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states.
[2020-07-20 11:00:13,543 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:13,544 INFO  L93              Difference]: Finished difference Result 72 states and 194 transitions.
[2020-07-20 11:00:13,544 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-07-20 11:00:13,544 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 286
[2020-07-20 11:00:13,545 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:13,548 INFO  L225             Difference]: With dead ends: 72
[2020-07-20 11:00:13,548 INFO  L226             Difference]: Without dead ends: 68
[2020-07-20 11:00:13,549 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506
[2020-07-20 11:00:13,549 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 68 states.
[2020-07-20 11:00:13,560 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46.
[2020-07-20 11:00:13,560 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 46 states.
[2020-07-20 11:00:13,562 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions.
[2020-07-20 11:00:13,562 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286
[2020-07-20 11:00:13,563 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:13,563 INFO  L479      AbstractCegarLoop]: Abstraction has 46 states and 90 transitions.
[2020-07-20 11:00:13,563 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-07-20 11:00:13,563 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions.
[2020-07-20 11:00:13,568 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 301
[2020-07-20 11:00:13,568 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:13,569 INFO  L422         BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:13,781 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:13,782 INFO  L427      AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:13,783 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:13,783 INFO  L82        PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times
[2020-07-20 11:00:13,783 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:13,784 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529460399]
[2020-07-20 11:00:13,784 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:13,909 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:13,911 INFO  L263         TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 14 conjunts are in the unsatisfiable core
[2020-07-20 11:00:13,917 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:14,031 INFO  L134       CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked.
[2020-07-20 11:00:14,031 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:15,342 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:15,669 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:15,823 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:15,914 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:15,915 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:15,964 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:16,040 INFO  L134       CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked.
[2020-07-20 11:00:16,041 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529460399]
[2020-07-20 11:00:16,041 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:16,041 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17
[2020-07-20 11:00:16,041 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015168114]
[2020-07-20 11:00:16,042 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 17 states
[2020-07-20 11:00:16,042 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:16,042 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants.
[2020-07-20 11:00:16,043 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272
[2020-07-20 11:00:16,043 INFO  L87              Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states.
[2020-07-20 11:00:16,302 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:16,302 INFO  L93              Difference]: Finished difference Result 77 states and 222 transitions.
[2020-07-20 11:00:16,302 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-07-20 11:00:16,303 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states. Word has length 300
[2020-07-20 11:00:16,304 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:16,306 INFO  L225             Difference]: With dead ends: 77
[2020-07-20 11:00:16,306 INFO  L226             Difference]: Without dead ends: 73
[2020-07-20 11:00:16,307 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506
[2020-07-20 11:00:16,307 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 73 states.
[2020-07-20 11:00:16,320 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46.
[2020-07-20 11:00:16,321 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 46 states.
[2020-07-20 11:00:16,325 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions.
[2020-07-20 11:00:16,325 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300
[2020-07-20 11:00:16,326 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:16,326 INFO  L479      AbstractCegarLoop]: Abstraction has 46 states and 90 transitions.
[2020-07-20 11:00:16,326 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 17 states.
[2020-07-20 11:00:16,326 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions.
[2020-07-20 11:00:16,331 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 469
[2020-07-20 11:00:16,332 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:16,332 INFO  L422         BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:16,545 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:16,546 INFO  L427      AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:16,546 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:16,547 INFO  L82        PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times
[2020-07-20 11:00:16,547 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:16,547 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252966689]
[2020-07-20 11:00:16,548 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:16,743 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:16,746 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1046 conjuncts, 16 conjunts are in the unsatisfiable core
[2020-07-20 11:00:16,754 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:16,951 INFO  L134       CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked.
[2020-07-20 11:00:16,952 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:18,940 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:19,489 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:19,767 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:19,955 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:19,956 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:20,044 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:20,102 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:20,103 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:20,249 INFO  L134       CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked.
[2020-07-20 11:00:20,249 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252966689]
[2020-07-20 11:00:20,249 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:20,249 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19
[2020-07-20 11:00:20,250 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248582382]
[2020-07-20 11:00:20,250 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 19 states
[2020-07-20 11:00:20,251 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:20,251 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2020-07-20 11:00:20,251 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342
[2020-07-20 11:00:20,251 INFO  L87              Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states.
[2020-07-20 11:00:20,601 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:20,601 INFO  L93              Difference]: Finished difference Result 82 states and 252 transitions.
[2020-07-20 11:00:20,601 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-07-20 11:00:20,602 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states. Word has length 468
[2020-07-20 11:00:20,604 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:20,606 INFO  L225             Difference]: With dead ends: 82
[2020-07-20 11:00:20,606 INFO  L226             Difference]: Without dead ends: 78
[2020-07-20 11:00:20,607 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650
[2020-07-20 11:00:20,608 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 78 states.
[2020-07-20 11:00:20,618 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51.
[2020-07-20 11:00:20,618 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 51 states.
[2020-07-20 11:00:20,620 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions.
[2020-07-20 11:00:20,620 INFO  L78                 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468
[2020-07-20 11:00:20,621 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:20,621 INFO  L479      AbstractCegarLoop]: Abstraction has 51 states and 109 transitions.
[2020-07-20 11:00:20,621 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 19 states.
[2020-07-20 11:00:20,621 INFO  L276                IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions.
[2020-07-20 11:00:20,624 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 451
[2020-07-20 11:00:20,625 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:20,625 INFO  L422         BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:20,838 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:20,839 INFO  L427      AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:20,839 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:20,840 INFO  L82        PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times
[2020-07-20 11:00:20,840 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:20,840 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1554804840]
[2020-07-20 11:00:20,840 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:21,050 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:21,053 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core
[2020-07-20 11:00:21,060 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:21,260 INFO  L134       CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked.
[2020-07-20 11:00:21,261 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:23,007 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:23,667 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:23,668 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,006 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,010 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,176 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,266 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,270 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,317 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:24,460 INFO  L134       CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked.
[2020-07-20 11:00:24,461 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1554804840]
[2020-07-20 11:00:24,461 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:24,462 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19
[2020-07-20 11:00:24,462 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073971485]
[2020-07-20 11:00:24,463 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 19 states
[2020-07-20 11:00:24,463 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:24,463 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants.
[2020-07-20 11:00:24,464 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342
[2020-07-20 11:00:24,464 INFO  L87              Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states.
[2020-07-20 11:00:24,985 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:24,985 INFO  L93              Difference]: Finished difference Result 87 states and 284 transitions.
[2020-07-20 11:00:24,986 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2020-07-20 11:00:24,986 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states. Word has length 450
[2020-07-20 11:00:24,988 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:24,992 INFO  L225             Difference]: With dead ends: 87
[2020-07-20 11:00:24,993 INFO  L226             Difference]: Without dead ends: 83
[2020-07-20 11:00:24,996 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650
[2020-07-20 11:00:24,996 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 83 states.
[2020-07-20 11:00:25,022 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51.
[2020-07-20 11:00:25,022 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 51 states.
[2020-07-20 11:00:25,027 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions.
[2020-07-20 11:00:25,027 INFO  L78                 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450
[2020-07-20 11:00:25,029 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:25,029 INFO  L479      AbstractCegarLoop]: Abstraction has 51 states and 109 transitions.
[2020-07-20 11:00:25,029 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 19 states.
[2020-07-20 11:00:25,029 INFO  L276                IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions.
[2020-07-20 11:00:25,042 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 872
[2020-07-20 11:00:25,042 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:25,043 INFO  L422         BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:25,256 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:25,257 INFO  L427      AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:25,257 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:25,258 INFO  L82        PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times
[2020-07-20 11:00:25,258 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:25,258 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190108669]
[2020-07-20 11:00:25,259 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:25,583 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:25,588 INFO  L263         TraceCheckSpWp]: Trace formula consists of 1945 conjuncts, 18 conjunts are in the unsatisfiable core
[2020-07-20 11:00:25,600 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:26,144 INFO  L134       CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked.
[2020-07-20 11:00:26,145 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:29,132 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:29,133 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:30,575 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,254 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,254 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,635 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,636 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,800 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,801 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,892 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,893 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:31,942 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:32,303 INFO  L134       CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked.
[2020-07-20 11:00:32,303 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190108669]
[2020-07-20 11:00:32,303 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:32,304 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21
[2020-07-20 11:00:32,304 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144443662]
[2020-07-20 11:00:32,306 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-07-20 11:00:32,306 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:32,306 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-07-20 11:00:32,307 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420
[2020-07-20 11:00:32,307 INFO  L87              Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states.
[2020-07-20 11:00:32,722 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:32,722 INFO  L93              Difference]: Finished difference Result 92 states and 318 transitions.
[2020-07-20 11:00:32,723 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-07-20 11:00:32,723 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 871
[2020-07-20 11:00:32,725 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:32,728 INFO  L225             Difference]: With dead ends: 92
[2020-07-20 11:00:32,729 INFO  L226             Difference]: Without dead ends: 88
[2020-07-20 11:00:32,734 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812
[2020-07-20 11:00:32,735 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 88 states.
[2020-07-20 11:00:32,759 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56.
[2020-07-20 11:00:32,760 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 56 states.
[2020-07-20 11:00:32,762 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions.
[2020-07-20 11:00:32,762 INFO  L78                 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871
[2020-07-20 11:00:32,765 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:32,765 INFO  L479      AbstractCegarLoop]: Abstraction has 56 states and 130 transitions.
[2020-07-20 11:00:32,765 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-07-20 11:00:32,765 INFO  L276                IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions.
[2020-07-20 11:00:32,776 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 1078
[2020-07-20 11:00:32,776 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:32,777 INFO  L422         BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:32,991 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:32,992 INFO  L427      AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:32,992 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:32,993 INFO  L82        PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times
[2020-07-20 11:00:32,993 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:32,994 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444241070]
[2020-07-20 11:00:32,994 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:33,442 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:33,448 INFO  L263         TraceCheckSpWp]: Trace formula consists of 2393 conjuncts, 18 conjunts are in the unsatisfiable core
[2020-07-20 11:00:33,462 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:33,964 INFO  L134       CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked.
[2020-07-20 11:00:33,964 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:37,567 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:37,568 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:38,818 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:39,454 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:39,455 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:39,832 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:39,833 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:40,038 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:40,161 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:40,228 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:41,011 INFO  L134       CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked.
[2020-07-20 11:00:41,012 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444241070]
[2020-07-20 11:00:41,012 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:41,013 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21
[2020-07-20 11:00:41,013 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92344117]
[2020-07-20 11:00:41,014 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 21 states
[2020-07-20 11:00:41,015 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:41,015 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants.
[2020-07-20 11:00:41,015 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420
[2020-07-20 11:00:41,015 INFO  L87              Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states.
[2020-07-20 11:00:41,560 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:41,560 INFO  L93              Difference]: Finished difference Result 97 states and 354 transitions.
[2020-07-20 11:00:41,560 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-07-20 11:00:41,561 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077
[2020-07-20 11:00:41,563 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:41,566 INFO  L225             Difference]: With dead ends: 97
[2020-07-20 11:00:41,566 INFO  L226             Difference]: Without dead ends: 93
[2020-07-20 11:00:41,567 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812
[2020-07-20 11:00:41,568 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 93 states.
[2020-07-20 11:00:41,581 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56.
[2020-07-20 11:00:41,582 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 56 states.
[2020-07-20 11:00:41,583 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions.
[2020-07-20 11:00:41,583 INFO  L78                 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077
[2020-07-20 11:00:41,585 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:41,585 INFO  L479      AbstractCegarLoop]: Abstraction has 56 states and 130 transitions.
[2020-07-20 11:00:41,585 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 21 states.
[2020-07-20 11:00:41,585 INFO  L276                IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions.
[2020-07-20 11:00:41,606 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 1574
[2020-07-20 11:00:41,606 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:41,607 INFO  L422         BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:41,821 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:41,822 INFO  L427      AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:41,822 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:41,823 INFO  L82        PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times
[2020-07-20 11:00:41,824 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:41,824 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381977780]
[2020-07-20 11:00:41,824 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:42,423 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:42,430 INFO  L263         TraceCheckSpWp]: Trace formula consists of 3511 conjuncts, 20 conjunts are in the unsatisfiable core
[2020-07-20 11:00:42,447 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:43,396 INFO  L134       CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked.
[2020-07-20 11:00:43,396 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:00:48,272 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:50,520 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:51,761 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:52,301 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:52,302 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:52,688 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:52,688 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:52,917 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:53,020 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:53,021 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:53,075 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:53,077 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:00:53,981 INFO  L134       CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked.
[2020-07-20 11:00:53,982 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381977780]
[2020-07-20 11:00:53,982 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:00:53,982 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23
[2020-07-20 11:00:53,983 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950782433]
[2020-07-20 11:00:53,984 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 23 states
[2020-07-20 11:00:53,984 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:00:53,984 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants.
[2020-07-20 11:00:53,985 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506
[2020-07-20 11:00:53,985 INFO  L87              Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states.
[2020-07-20 11:00:54,756 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:00:54,756 INFO  L93              Difference]: Finished difference Result 102 states and 392 transitions.
[2020-07-20 11:00:54,757 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-07-20 11:00:54,757 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573
[2020-07-20 11:00:54,760 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:00:54,763 INFO  L225             Difference]: With dead ends: 102
[2020-07-20 11:00:54,763 INFO  L226             Difference]: Without dead ends: 98
[2020-07-20 11:00:54,765 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992
[2020-07-20 11:00:54,765 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 98 states.
[2020-07-20 11:00:54,777 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61.
[2020-07-20 11:00:54,777 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 61 states.
[2020-07-20 11:00:54,778 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions.
[2020-07-20 11:00:54,779 INFO  L78                 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573
[2020-07-20 11:00:54,781 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:00:54,781 INFO  L479      AbstractCegarLoop]: Abstraction has 61 states and 153 transitions.
[2020-07-20 11:00:54,781 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 23 states.
[2020-07-20 11:00:54,781 INFO  L276                IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions.
[2020-07-20 11:00:54,819 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 1843
[2020-07-20 11:00:54,820 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:00:54,821 INFO  L422         BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:00:55,033 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:55,034 INFO  L427      AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:00:55,034 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:00:55,035 INFO  L82        PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times
[2020-07-20 11:00:55,035 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:00:55,035 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091914851]
[2020-07-20 11:00:55,036 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:00:55,638 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:00:55,646 INFO  L263         TraceCheckSpWp]: Trace formula consists of 4091 conjuncts, 20 conjunts are in the unsatisfiable core
[2020-07-20 11:00:55,664 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:00:56,918 INFO  L134       CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked.
[2020-07-20 11:00:56,918 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:01:02,217 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:04,967 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:04,968 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:06,428 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:06,429 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:07,091 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:07,445 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:07,445 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:07,612 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:07,707 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:07,767 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:08,943 INFO  L134       CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked.
[2020-07-20 11:01:08,943 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091914851]
[2020-07-20 11:01:08,943 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:01:08,944 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23
[2020-07-20 11:01:08,944 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147086659]
[2020-07-20 11:01:08,946 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 23 states
[2020-07-20 11:01:08,946 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:01:08,947 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants.
[2020-07-20 11:01:08,947 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506
[2020-07-20 11:01:08,947 INFO  L87              Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states.
[2020-07-20 11:01:09,453 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:01:09,454 INFO  L93              Difference]: Finished difference Result 107 states and 432 transitions.
[2020-07-20 11:01:09,454 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2020-07-20 11:01:09,455 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842
[2020-07-20 11:01:09,457 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:01:09,460 INFO  L225             Difference]: With dead ends: 107
[2020-07-20 11:01:09,461 INFO  L226             Difference]: Without dead ends: 103
[2020-07-20 11:01:09,462 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992
[2020-07-20 11:01:09,462 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 103 states.
[2020-07-20 11:01:09,477 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61.
[2020-07-20 11:01:09,477 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 61 states.
[2020-07-20 11:01:09,480 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions.
[2020-07-20 11:01:09,481 INFO  L78                 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842
[2020-07-20 11:01:09,482 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:01:09,482 INFO  L479      AbstractCegarLoop]: Abstraction has 61 states and 153 transitions.
[2020-07-20 11:01:09,482 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 23 states.
[2020-07-20 11:01:09,482 INFO  L276                IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions.
[2020-07-20 11:01:09,514 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 2107
[2020-07-20 11:01:09,514 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:01:09,515 INFO  L422         BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:01:09,730 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:01:09,731 INFO  L427      AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:01:09,731 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:01:09,733 INFO  L82        PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times
[2020-07-20 11:01:09,733 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:01:09,733 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197516466]
[2020-07-20 11:01:09,734 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:01:10,515 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:01:10,524 INFO  L263         TraceCheckSpWp]: Trace formula consists of 4700 conjuncts, 22 conjunts are in the unsatisfiable core
[2020-07-20 11:01:10,542 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:01:13,252 INFO  L134       CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked.
[2020-07-20 11:01:13,252 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:01:19,981 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:23,671 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:25,543 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:26,442 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:26,442 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,007 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,008 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,376 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,377 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,553 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,647 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:27,701 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:29,177 INFO  L134       CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked.
[2020-07-20 11:01:29,178 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197516466]
[2020-07-20 11:01:29,178 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:01:29,178 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25
[2020-07-20 11:01:29,179 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042620210]
[2020-07-20 11:01:29,180 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 25 states
[2020-07-20 11:01:29,180 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:01:29,180 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants.
[2020-07-20 11:01:29,181 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600
[2020-07-20 11:01:29,181 INFO  L87              Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states.
[2020-07-20 11:01:29,859 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:01:29,859 INFO  L93              Difference]: Finished difference Result 112 states and 474 transitions.
[2020-07-20 11:01:29,860 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-07-20 11:01:29,860 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106
[2020-07-20 11:01:29,863 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:01:29,866 INFO  L225             Difference]: With dead ends: 112
[2020-07-20 11:01:29,867 INFO  L226             Difference]: Without dead ends: 108
[2020-07-20 11:01:29,868 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190
[2020-07-20 11:01:29,868 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 108 states.
[2020-07-20 11:01:29,883 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66.
[2020-07-20 11:01:29,883 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 66 states.
[2020-07-20 11:01:29,885 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions.
[2020-07-20 11:01:29,885 INFO  L78                 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106
[2020-07-20 11:01:29,886 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:01:29,886 INFO  L479      AbstractCegarLoop]: Abstraction has 66 states and 178 transitions.
[2020-07-20 11:01:29,887 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 25 states.
[2020-07-20 11:01:29,887 INFO  L276                IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions.
[2020-07-20 11:01:29,936 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 2206
[2020-07-20 11:01:29,937 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:01:29,938 INFO  L422         BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:01:30,153 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:01:30,154 INFO  L427      AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:01:30,154 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:01:30,154 INFO  L82        PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times
[2020-07-20 11:01:30,155 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:01:30,155 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2032669938]
[2020-07-20 11:01:30,155 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:01:31,004 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:01:31,015 INFO  L263         TraceCheckSpWp]: Trace formula consists of 4898 conjuncts, 22 conjunts are in the unsatisfiable core
[2020-07-20 11:01:31,037 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:01:32,773 INFO  L134       CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked.
[2020-07-20 11:01:32,773 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:01:39,852 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:43,623 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:45,642 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:45,643 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:46,525 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,179 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,485 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,693 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,797 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,797 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,853 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:47,854 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:01:49,446 INFO  L134       CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked.
[2020-07-20 11:01:49,447 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2032669938]
[2020-07-20 11:01:49,447 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:01:49,449 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25
[2020-07-20 11:01:49,449 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214941886]
[2020-07-20 11:01:49,452 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 25 states
[2020-07-20 11:01:49,452 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:01:49,452 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants.
[2020-07-20 11:01:49,453 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600
[2020-07-20 11:01:49,453 INFO  L87              Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states.
[2020-07-20 11:01:50,213 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:01:50,214 INFO  L93              Difference]: Finished difference Result 117 states and 518 transitions.
[2020-07-20 11:01:50,215 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-07-20 11:01:50,215 INFO  L78                 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205
[2020-07-20 11:01:50,217 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:01:50,221 INFO  L225             Difference]: With dead ends: 117
[2020-07-20 11:01:50,221 INFO  L226             Difference]: Without dead ends: 113
[2020-07-20 11:01:50,223 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190
[2020-07-20 11:01:50,223 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 113 states.
[2020-07-20 11:01:50,240 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66.
[2020-07-20 11:01:50,240 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 66 states.
[2020-07-20 11:01:50,241 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions.
[2020-07-20 11:01:50,242 INFO  L78                 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205
[2020-07-20 11:01:50,243 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:01:50,244 INFO  L479      AbstractCegarLoop]: Abstraction has 66 states and 178 transitions.
[2020-07-20 11:01:50,244 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 25 states.
[2020-07-20 11:01:50,244 INFO  L276                IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions.
[2020-07-20 11:01:50,354 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 4434
[2020-07-20 11:01:50,355 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:01:50,356 INFO  L422         BasicCegarLoop]: trace histogram [681, 681, 341, 340, 340, 340, 340, 340, 340, 340, 340, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:01:50,557 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:01:50,557 INFO  L427      AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:01:50,558 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:01:50,560 INFO  L82        PathProgramCache]: Analyzing trace with hash 1507680547, now seen corresponding path program 10 times
[2020-07-20 11:01:50,560 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:01:50,560 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [58012836]
[2020-07-20 11:01:50,560 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:01:52,091 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:01:52,111 INFO  L263         TraceCheckSpWp]: Trace formula consists of 9891 conjuncts, 24 conjunts are in the unsatisfiable core
[2020-07-20 11:01:52,145 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:01:58,700 INFO  L134       CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34400 refuted. 0 times theorem prover too weak. 1175455 trivial. 0 not checked.
[2020-07-20 11:01:58,700 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:02:15,088 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:15,089 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:23,061 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:26,537 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:28,292 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:29,975 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:30,611 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:30,612 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:31,046 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:31,257 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:31,375 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:31,439 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:02:37,390 INFO  L134       CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34545 refuted. 0 times theorem prover too weak. 1175310 trivial. 0 not checked.
[2020-07-20 11:02:37,391 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [58012836]
[2020-07-20 11:02:37,391 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:02:37,392 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27
[2020-07-20 11:02:37,392 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135271044]
[2020-07-20 11:02:37,395 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 27 states
[2020-07-20 11:02:37,395 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:02:37,395 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants.
[2020-07-20 11:02:37,396 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702
[2020-07-20 11:02:37,396 INFO  L87              Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states.
[2020-07-20 11:02:38,574 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:02:38,574 INFO  L93              Difference]: Finished difference Result 122 states and 564 transitions.
[2020-07-20 11:02:38,577 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-07-20 11:02:38,578 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states. Word has length 4433
[2020-07-20 11:02:38,582 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:02:38,586 INFO  L225             Difference]: With dead ends: 122
[2020-07-20 11:02:38,586 INFO  L226             Difference]: Without dead ends: 118
[2020-07-20 11:02:38,588 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 8877 GetRequests, 8819 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406
[2020-07-20 11:02:38,588 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 118 states.
[2020-07-20 11:02:38,607 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71.
[2020-07-20 11:02:38,608 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 71 states.
[2020-07-20 11:02:38,609 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions.
[2020-07-20 11:02:38,609 INFO  L78                 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4433
[2020-07-20 11:02:38,612 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:02:38,613 INFO  L479      AbstractCegarLoop]: Abstraction has 71 states and 205 transitions.
[2020-07-20 11:02:38,613 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 27 states.
[2020-07-20 11:02:38,613 INFO  L276                IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions.
[2020-07-20 11:02:39,152 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8141
[2020-07-20 11:02:39,152 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:02:39,155 INFO  L422         BasicCegarLoop]: trace histogram [1199, 1199, 939, 599, 599, 599, 599, 599, 599, 599, 340, 260, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:02:39,355 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:02:39,356 INFO  L427      AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:02:39,356 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:02:39,359 INFO  L82        PathProgramCache]: Analyzing trace with hash 1642038220, now seen corresponding path program 10 times
[2020-07-20 11:02:39,359 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:02:39,359 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243557568]
[2020-07-20 11:02:39,359 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:02:42,092 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:02:42,135 INFO  L263         TraceCheckSpWp]: Trace formula consists of 18082 conjuncts, 24 conjunts are in the unsatisfiable core
[2020-07-20 11:02:42,192 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:03:01,508 INFO  L134       CoverageAnalysis]: Checked inductivity of 4029599 backedges. 7276 proven. 65941 refuted. 0 times theorem prover too weak. 3956382 trivial. 0 not checked.
[2020-07-20 11:03:01,509 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:03:36,814 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:03:51,249 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:03:51,250 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:03:57,079 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:03:57,080 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:00,220 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:00,221 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:03,026 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:03,027 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:04,309 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:04,310 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:04,963 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:05,294 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:05,294 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:05,427 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:05,427 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:05,500 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:04:24,974 INFO  L134       CoverageAnalysis]: Checked inductivity of 4029599 backedges. 7276 proven. 66096 refuted. 0 times theorem prover too weak. 3956227 trivial. 0 not checked.
[2020-07-20 11:04:24,975 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243557568]
[2020-07-20 11:04:24,975 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:04:24,978 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27
[2020-07-20 11:04:24,978 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902005236]
[2020-07-20 11:04:24,984 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 27 states
[2020-07-20 11:04:24,984 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:04:24,985 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants.
[2020-07-20 11:04:24,985 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702
[2020-07-20 11:04:24,985 INFO  L87              Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states.
[2020-07-20 11:04:26,493 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:04:26,494 INFO  L93              Difference]: Finished difference Result 127 states and 612 transitions.
[2020-07-20 11:04:26,497 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-07-20 11:04:26,498 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states. Word has length 8140
[2020-07-20 11:04:26,503 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:04:26,507 INFO  L225             Difference]: With dead ends: 127
[2020-07-20 11:04:26,507 INFO  L226             Difference]: Without dead ends: 123
[2020-07-20 11:04:26,508 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 16290 GetRequests, 16232 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406
[2020-07-20 11:04:26,509 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 123 states.
[2020-07-20 11:04:26,529 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71.
[2020-07-20 11:04:26,529 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 71 states.
[2020-07-20 11:04:26,531 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions.
[2020-07-20 11:04:26,531 INFO  L78                 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 8140
[2020-07-20 11:04:26,536 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:04:26,537 INFO  L479      AbstractCegarLoop]: Abstraction has 71 states and 205 transitions.
[2020-07-20 11:04:26,537 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 27 states.
[2020-07-20 11:04:26,537 INFO  L276                IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions.
[2020-07-20 11:04:27,179 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11129
[2020-07-20 11:04:27,179 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:04:27,183 INFO  L422         BasicCegarLoop]: trace histogram [1711, 1711, 856, 855, 855, 855, 855, 855, 855, 855, 855, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:04:27,383 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:04:27,384 INFO  L427      AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:04:27,384 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:04:27,388 INFO  L82        PathProgramCache]: Analyzing trace with hash -434172532, now seen corresponding path program 11 times
[2020-07-20 11:04:27,388 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:04:27,388 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [951107115]
[2020-07-20 11:04:27,389 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:04:32,137 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:04:32,214 INFO  L263         TraceCheckSpWp]: Trace formula consists of 24826 conjuncts, 26 conjunts are in the unsatisfiable core
[2020-07-20 11:04:32,297 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:05:08,950 INFO  L134       CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97572 refuted. 0 times theorem prover too weak. 7569164 trivial. 0 not checked.
[2020-07-20 11:05:08,950 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:05:21,034 WARN  L193               SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 63
[2020-07-20 11:06:10,734 WARN  L193               SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 56
[2020-07-20 11:06:10,939 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:06:11,837 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:06:38,242 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54
[2020-07-20 11:06:39,018 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:06:49,809 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:06:49,810 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:06:57,776 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:06:57,777 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:00,975 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:03,495 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:03,496 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:04,603 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:04,604 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:05,385 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:05,830 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:05,831 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:06,029 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:06,152 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:07:45,117 INFO  L134       CoverageAnalysis]: Checked inductivity of 7677045 backedges. 10309 proven. 97748 refuted. 0 times theorem prover too weak. 7568988 trivial. 0 not checked.
[2020-07-20 11:07:45,118 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [951107115]
[2020-07-20 11:07:45,118 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:07:45,121 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29
[2020-07-20 11:07:45,121 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081849356]
[2020-07-20 11:07:45,129 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 29 states
[2020-07-20 11:07:45,130 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:07:45,130 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants.
[2020-07-20 11:07:45,131 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812
[2020-07-20 11:07:45,131 INFO  L87              Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states.
[2020-07-20 11:07:46,870 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:07:46,870 INFO  L93              Difference]: Finished difference Result 132 states and 662 transitions.
[2020-07-20 11:07:46,872 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2020-07-20 11:07:46,872 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states. Word has length 11128
[2020-07-20 11:07:46,880 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:07:46,886 INFO  L225             Difference]: With dead ends: 132
[2020-07-20 11:07:46,886 INFO  L226             Difference]: Without dead ends: 128
[2020-07-20 11:07:46,888 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 22268 GetRequests, 22205 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640
[2020-07-20 11:07:46,889 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 128 states.
[2020-07-20 11:07:46,913 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76.
[2020-07-20 11:07:46,914 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 76 states.
[2020-07-20 11:07:46,916 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions.
[2020-07-20 11:07:46,916 INFO  L78                 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11128
[2020-07-20 11:07:46,922 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:07:46,923 INFO  L479      AbstractCegarLoop]: Abstraction has 76 states and 234 transitions.
[2020-07-20 11:07:46,923 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 29 states.
[2020-07-20 11:07:46,923 INFO  L276                IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions.
[2020-07-20 11:07:47,904 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9939
[2020-07-20 11:07:47,904 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:07:47,911 INFO  L422         BasicCegarLoop]: trace histogram [1459, 1459, 1177, 729, 729, 729, 729, 729, 729, 729, 448, 282, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:07:48,126 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:07:48,127 INFO  L427      AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:07:48,127 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:07:48,132 INFO  L82        PathProgramCache]: Analyzing trace with hash -1208289302, now seen corresponding path program 11 times
[2020-07-20 11:07:48,132 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:07:48,133 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993020980]
[2020-07-20 11:07:48,134 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:07:51,799 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:07:51,863 INFO  L263         TraceCheckSpWp]: Trace formula consists of 22068 conjuncts, 26 conjunts are in the unsatisfiable core
[2020-07-20 11:07:51,945 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:08:26,406 INFO  L134       CoverageAnalysis]: Checked inductivity of 6007944 backedges. 8741 proven. 89220 refuted. 0 times theorem prover too weak. 5909983 trivial. 0 not checked.
[2020-07-20 11:08:26,406 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:08:33,782 WARN  L193               SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56
[2020-07-20 11:08:33,890 WARN  L193               SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56
[2020-07-20 11:08:34,021 WARN  L193               SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:08:34,134 WARN  L193               SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:08:39,784 WARN  L193               SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 61
[2020-07-20 11:08:39,902 WARN  L193               SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 61
[2020-07-20 11:08:40,022 WARN  L193               SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 63
[2020-07-20 11:08:40,146 WARN  L193               SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 63
[2020-07-20 11:08:40,262 WARN  L193               SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 84
[2020-07-20 11:08:40,366 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 81
[2020-07-20 11:08:40,470 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 77
[2020-07-20 11:09:38,298 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54
[2020-07-20 11:09:41,592 WARN  L193               SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 56
[2020-07-20 11:09:41,700 WARN  L193               SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56
[2020-07-20 11:09:41,817 WARN  L193               SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:09:41,946 WARN  L193               SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:09:42,072 WARN  L193               SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 78
[2020-07-20 11:09:42,176 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 75
[2020-07-20 11:09:42,285 WARN  L193               SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 71
[2020-07-20 11:09:42,390 WARN  L193               SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 68
[2020-07-20 11:09:43,077 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:09:43,078 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:13,306 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 51
[2020-07-20 11:10:13,411 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51
[2020-07-20 11:10:14,779 WARN  L193               SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 54
[2020-07-20 11:10:14,885 WARN  L193               SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 54
[2020-07-20 11:10:14,992 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 71
[2020-07-20 11:10:15,095 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 68
[2020-07-20 11:10:15,801 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:27,173 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49
[2020-07-20 11:10:27,938 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:27,939 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:36,131 WARN  L193               SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 57
[2020-07-20 11:10:36,593 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:36,594 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:39,961 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:39,962 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:42,798 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:42,799 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:44,192 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:45,154 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:45,607 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:45,607 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:45,876 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:45,877 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:10:46,031 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts
[2020-07-20 11:11:18,436 INFO  L134       CoverageAnalysis]: Checked inductivity of 6007944 backedges. 8741 proven. 89407 refuted. 0 times theorem prover too weak. 5909796 trivial. 0 not checked.
[2020-07-20 11:11:18,436 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993020980]
[2020-07-20 11:11:18,436 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-20 11:11:18,439 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29
[2020-07-20 11:11:18,439 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885362033]
[2020-07-20 11:11:18,442 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 29 states
[2020-07-20 11:11:18,443 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-20 11:11:18,443 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants.
[2020-07-20 11:11:18,444 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812
[2020-07-20 11:11:18,444 INFO  L87              Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states.
[2020-07-20 11:11:21,324 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-20 11:11:21,325 INFO  L93              Difference]: Finished difference Result 137 states and 714 transitions.
[2020-07-20 11:11:21,328 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. 
[2020-07-20 11:11:21,329 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states. Word has length 9938
[2020-07-20 11:11:21,336 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-20 11:11:21,342 INFO  L225             Difference]: With dead ends: 137
[2020-07-20 11:11:21,342 INFO  L226             Difference]: Without dead ends: 133
[2020-07-20 11:11:21,345 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19887 GetRequests, 19824 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640
[2020-07-20 11:11:21,345 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 133 states.
[2020-07-20 11:11:21,373 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76.
[2020-07-20 11:11:21,374 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 76 states.
[2020-07-20 11:11:21,376 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions.
[2020-07-20 11:11:21,376 INFO  L78                 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 9938
[2020-07-20 11:11:21,382 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-07-20 11:11:21,382 INFO  L479      AbstractCegarLoop]: Abstraction has 76 states and 234 transitions.
[2020-07-20 11:11:21,382 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 29 states.
[2020-07-20 11:11:21,382 INFO  L276                IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions.
[2020-07-20 11:11:22,282 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8971
[2020-07-20 11:11:22,283 INFO  L414         BasicCegarLoop]: Found error trace
[2020-07-20 11:11:22,289 INFO  L422         BasicCegarLoop]: trace histogram [1379, 1379, 690, 689, 689, 689, 689, 689, 689, 689, 689, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-07-20 11:11:22,503 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:11:22,503 INFO  L427      AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-20 11:11:22,505 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-07-20 11:11:22,507 INFO  L82        PathProgramCache]: Analyzing trace with hash 1584963562, now seen corresponding path program 12 times
[2020-07-20 11:11:22,508 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-20 11:11:22,508 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503783547]
[2020-07-20 11:11:22,508 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-20 11:11:26,091 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-07-20 11:11:26,180 INFO  L263         TraceCheckSpWp]: Trace formula consists of 20012 conjuncts, 28 conjunts are in the unsatisfiable core
[2020-07-20 11:11:26,265 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2020-07-20 11:11:53,571 INFO  L134       CoverageAnalysis]: Checked inductivity of 4985604 backedges. 9211 proven. 85037 refuted. 0 times theorem prover too weak. 4891356 trivial. 0 not checked.
[2020-07-20 11:11:53,572 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2020-07-20 11:11:58,157 WARN  L193               SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54
[2020-07-20 11:11:58,260 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 54
[2020-07-20 11:11:59,652 WARN  L193               SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 56
[2020-07-20 11:11:59,774 WARN  L193               SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:11:59,900 WARN  L193               SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 59
[2020-07-20 11:12:02,730 WARN  L193               SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61
[2020-07-20 11:12:02,874 WARN  L193               SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 61
[2020-07-20 11:12:03,026 WARN  L193               SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 64
[2020-07-20 11:12:03,179 WARN  L193               SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 64
[2020-07-20 11:12:10,193 WARN  L193               SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 66
[2020-07-20 11:12:10,352 WARN  L193               SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 66
[2020-07-20 11:12:10,508 WARN  L193               SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 68
[2020-07-20 11:12:10,656 WARN  L193               SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 68
[2020-07-20 11:12:10,807 WARN  L193               SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 91
[2020-07-20 11:12:10,958 WARN  L193               SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 88
[2020-07-20 11:12:11,108 WARN  L193               SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 84
[2020-07-20 11:12:11,247 WARN  L193               SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 80
[2020-07-20 11:12:11,383 WARN  L193               SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 76
[2020-07-20 11:12:11,503 WARN  L193               SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 73
[2020-07-20 11:12:11,607 WARN  L193               SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 69
[2020-07-20 11:12:12,145 WARN  L193               SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 52
[2020-07-20 11:13:09,388 INFO  L501       QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts