/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 SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:35:55,096 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:35:55,099 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:35:55,112 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:35:55,113 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:35:55,114 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:35:55,115 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:35:55,117 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:35:55,119 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:35:55,120 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:35:55,121 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:35:55,122 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:35:55,122 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:35:55,123 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:35:55,124 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:35:55,125 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:35:55,126 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:35:55,127 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:35:55,129 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:35:55,131 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:35:55,132 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:35:55,133 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:35:55,134 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:35:55,135 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:35:55,138 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:35:55,146 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:35:55,147 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:35:55,147 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:35:55,148 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 21:35:55,164 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:35:55,165 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:35:55,166 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:35:55,167 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:35:55,167 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:35:55,167 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:35:55,167 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:35:55,168 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:35:55,168 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:35:55,168 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:35:55,168 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:35:55,168 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:35:55,169 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:35:55,169 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:35:55,169 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:35:55,169 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:35:55,170 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:35:55,170 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:35:55,170 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:35:55,171 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:35:55,171 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:35:55,171 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:55,171 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:35:55,171 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:35:55,172 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:35:55,172 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:35:55,172 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:55,172 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:35:55,173 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:35:55,173 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 -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:35:55,511 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:35:55,527 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:35:55,532 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:35:55,534 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:35:55,534 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:35:55,535 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-20 21:35:55,614 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4fca2c68/74171d3de2d44bf1983e3ad0d6494f1b/FLAG252c68727 [2020-07-20 21:35:56,134 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:35:56,135 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-20 21:35:56,149 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4fca2c68/74171d3de2d44bf1983e3ad0d6494f1b/FLAG252c68727 [2020-07-20 21:35:56,494 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e4fca2c68/74171d3de2d44bf1983e3ad0d6494f1b [2020-07-20 21:35:56,505 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:35:56,509 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:35:56,511 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:56,511 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:35:56,515 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:35:56,517 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,521 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1726f43 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56, skipping insertion in model container [2020-07-20 21:35:56,521 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,531 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:35:56,553 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:35:56,746 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:56,750 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:35:56,770 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:56,786 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:35:56,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56 WrapperNode [2020-07-20 21:35:56,787 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:56,788 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:35:56,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:35:56,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:35:56,799 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,799 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,804 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,805 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,809 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,811 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,812 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (1/1) ... [2020-07-20 21:35:56,814 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:35:56,814 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:35:56,815 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:35:56,815 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:35:56,816 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (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 21:35:56,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:35:56,987 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:35:56,987 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:35:56,987 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:35:56,988 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:35:56,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:35:56,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:35:56,988 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:35:56,988 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:35:56,988 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:35:56,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:35:56,989 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:35:57,236 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:35:57,236 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:35:57,242 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:57 BoogieIcfgContainer [2020-07-20 21:35:57,242 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:35:57,244 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:35:57,244 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:35:57,248 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:35:57,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:35:56" (1/3) ... [2020-07-20 21:35:57,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60b5b5b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:57, skipping insertion in model container [2020-07-20 21:35:57,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:56" (2/3) ... [2020-07-20 21:35:57,250 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@60b5b5b5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:57, skipping insertion in model container [2020-07-20 21:35:57,250 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:57" (3/3) ... [2020-07-20 21:35:57,252 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-07-20 21:35:57,267 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:35:57,280 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:35:57,300 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:35:57,333 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:35:57,333 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:35:57,333 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:35:57,334 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:35:57,334 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:35:57,334 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:35:57,335 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:35:57,335 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:35:57,381 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:35:57,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:35:57,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:57,409 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:57,410 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:57,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:57,423 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:35:57,438 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:57,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2077475597] [2020-07-20 21:35:57,440 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:35:57,519 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:57,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:57,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:57,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:57,650 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 21:35:57,651 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:57,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2077475597] [2020-07-20 21:35:57,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:57,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:57,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568372673] [2020-07-20 21:35:57,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:57,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:57,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:57,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:57,679 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:35:57,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:57,820 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:35:57,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:57,824 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:35:57,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:57,838 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:35:57,838 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:35:57,843 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 21:35:57,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:35:57,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:35:57,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:57,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:57,898 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:35:57,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:57,899 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:57,899 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:57,900 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:57,902 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:35:57,902 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:57,903 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:58,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:58,118 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:58,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:58,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:35:58,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:58,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1681512075] [2020-07-20 21:35:58,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:35:58,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:58,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:58,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:58,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:58,181 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 21:35:58,181 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:58,182 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1681512075] [2020-07-20 21:35:58,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:58,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:58,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710104100] [2020-07-20 21:35:58,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:58,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:58,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:58,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:58,189 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:35:58,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:58,262 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:35:58,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:58,264 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:35:58,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:58,266 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:35:58,266 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:35:58,268 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 21:35:58,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:35:58,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:35:58,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:58,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:58,280 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:35:58,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:58,281 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:58,281 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:58,281 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:58,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:35:58,283 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:58,283 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:58,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:58,498 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:58,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:58,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:35:58,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:58,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1979972016] [2020-07-20 21:35:58,501 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:35:58,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:58,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:58,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:58,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:58,623 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:58,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:58,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:58,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:58,892 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:58,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1979972016] [2020-07-20 21:35:58,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:58,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:35:58,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391604559] [2020-07-20 21:35:58,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:35:58,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:58,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:35:58,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:35:58,896 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:35:59,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:59,058 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:35:59,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:59,059 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:35:59,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:59,062 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:35:59,062 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:35:59,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:35:59,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:35:59,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:35:59,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:35:59,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:35:59,076 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:35:59,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:59,076 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:35:59,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:35:59,077 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:35:59,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:35:59,079 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:59,079 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:59,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:59,295 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:59,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:59,296 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:35:59,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:59,297 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1875903605] [2020-07-20 21:35:59,297 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:35:59,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:59,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:59,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:59,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:59,393 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:59,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:59,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:59,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:59,590 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:35:59,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1875903605] [2020-07-20 21:35:59,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:59,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:35:59,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014178832] [2020-07-20 21:35:59,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:35:59,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:59,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:35:59,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:35:59,595 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:35:59,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:59,745 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:35:59,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:59,746 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:35:59,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:59,748 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:35:59,748 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:35:59,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:35:59,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:35:59,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:35:59,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:35:59,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:35:59,760 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:35:59,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:59,760 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:35:59,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:35:59,761 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:35:59,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:35:59,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:59,763 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:59,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:59,979 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:59,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:59,980 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:35:59,981 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:59,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1151059988] [2020-07-20 21:35:59,984 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:00,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:00,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:00,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:00,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:00,092 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:36:00,092 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:00,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,482 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:36:00,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1151059988] [2020-07-20 21:36:00,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:00,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:00,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311688137] [2020-07-20 21:36:00,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:00,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:00,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:00,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:00,486 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:36:00,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:00,702 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:36:00,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:00,703 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:36:00,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:00,707 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:36:00,707 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:36:00,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:00,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:36:00,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:36:00,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:00,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:00,723 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:36:00,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:00,724 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:00,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:00,724 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:00,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:36:00,726 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:00,726 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:00,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:00,942 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:00,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:00,943 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:36:00,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:00,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [133581697] [2020-07-20 21:36:00,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:00,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:00,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:00,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:01,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:01,074 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 21:36:01,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:01,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,420 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:36:01,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [133581697] [2020-07-20 21:36:01,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:01,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:01,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894117174] [2020-07-20 21:36:01,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:01,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:01,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:01,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:01,424 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 21:36:01,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:01,619 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:36:01,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:01,620 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 21:36:01,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:01,623 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:36:01,628 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:36:01,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:01,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:36:01,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:36:01,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:01,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:01,659 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:36:01,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:01,660 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:01,665 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:01,666 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:01,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:36:01,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,673 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:01,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:01,876 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:01,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:01,877 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:36:01,877 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:01,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338438831] [2020-07-20 21:36:01,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:01,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:01,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:01,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:01,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:02,007 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:36:02,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:02,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,594 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:36:02,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338438831] [2020-07-20 21:36:02,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:02,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:36:02,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1870687796] [2020-07-20 21:36:02,596 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:02,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:02,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:02,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:02,597 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 21:36:02,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:02,829 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:36:02,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:02,830 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 21:36:02,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:02,832 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:36:02,832 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:36:02,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:36:02,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:36:02,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:36:02,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:02,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:02,847 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:36:02,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:02,847 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:02,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:02,848 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:02,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:36:02,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:02,850 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:03,064 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:03,065 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:03,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:03,066 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:36:03,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:03,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241020235] [2020-07-20 21:36:03,068 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:03,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:03,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:03,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:03,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:03,207 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 21:36:03,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:03,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,776 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:36:03,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241020235] [2020-07-20 21:36:03,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:03,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:03,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543307219] [2020-07-20 21:36:03,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:03,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:03,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:03,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:03,781 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 13 states. [2020-07-20 21:36:04,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:04,002 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 21:36:04,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:04,002 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-20 21:36:04,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:04,005 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:36:04,005 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:36:04,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:04,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:36:04,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 21:36:04,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:04,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:04,018 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 21:36:04,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:04,019 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:04,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:04,019 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:04,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 21:36:04,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:04,021 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:04,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:04,236 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:04,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:04,237 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 21:36:04,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:04,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561800900] [2020-07-20 21:36:04,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:04,299 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:04,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:04,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:04,305 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:04,381 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 21:36:04,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:05,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,352 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 21:36:05,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561800900] [2020-07-20 21:36:05,354 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:05,354 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:05,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908957237] [2020-07-20 21:36:05,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:05,355 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:05,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:05,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:05,356 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 15 states. [2020-07-20 21:36:05,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:05,618 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 21:36:05,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:05,618 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2020-07-20 21:36:05,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:05,621 INFO L225 Difference]: With dead ends: 71 [2020-07-20 21:36:05,621 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:36:05,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:05,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:36:05,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 21:36:05,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:36:05,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:36:05,636 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 21:36:05,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:05,636 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:36:05,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:05,637 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:36:05,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:36:05,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:05,639 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:05,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:05,854 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:05,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:05,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 21:36:05,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:05,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266255581] [2020-07-20 21:36:05,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:05,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:05,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:05,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:05,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:06,020 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 79 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2020-07-20 21:36:06,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:06,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,691 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 83 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2020-07-20 21:36:06,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266255581] [2020-07-20 21:36:06,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:06,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:06,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125266074] [2020-07-20 21:36:06,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:06,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:06,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:06,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:06,697 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 13 states. [2020-07-20 21:36:06,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:06,911 INFO L93 Difference]: Finished difference Result 84 states and 164 transitions. [2020-07-20 21:36:06,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:06,912 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 108 [2020-07-20 21:36:06,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:06,914 INFO L225 Difference]: With dead ends: 84 [2020-07-20 21:36:06,915 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 21:36:06,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 196 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:06,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 21:36:06,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-07-20 21:36:06,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 21:36:06,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-20 21:36:06,934 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 108 [2020-07-20 21:36:06,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:06,935 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-20 21:36:06,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:06,935 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-20 21:36:06,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 21:36:06,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:06,938 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:07,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:07,152 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:07,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:07,153 INFO L82 PathProgramCache]: Analyzing trace with hash -60364660, now seen corresponding path program 1 times [2020-07-20 21:36:07,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:07,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2051649312] [2020-07-20 21:36:07,155 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:07,234 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:07,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:07,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:07,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:07,318 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 21:36:07,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:07,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,769 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 58 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-07-20 21:36:07,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2051649312] [2020-07-20 21:36:07,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:07,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:07,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900390208] [2020-07-20 21:36:07,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:07,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:07,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:07,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:07,773 INFO L87 Difference]: Start difference. First operand 52 states and 80 transitions. Second operand 11 states. [2020-07-20 21:36:07,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:07,916 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2020-07-20 21:36:07,916 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:07,916 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 109 [2020-07-20 21:36:07,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:07,921 INFO L225 Difference]: With dead ends: 79 [2020-07-20 21:36:07,921 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 21:36:07,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 202 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:07,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 21:36:07,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 54. [2020-07-20 21:36:07,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 21:36:07,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 85 transitions. [2020-07-20 21:36:07,935 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 85 transitions. Word has length 109 [2020-07-20 21:36:07,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:07,936 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 85 transitions. [2020-07-20 21:36:07,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:07,936 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 85 transitions. [2020-07-20 21:36:07,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 21:36:07,938 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:07,938 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:08,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:08,149 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:08,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:08,150 INFO L82 PathProgramCache]: Analyzing trace with hash 836558126, now seen corresponding path program 1 times [2020-07-20 21:36:08,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:08,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332460320] [2020-07-20 21:36:08,151 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:08,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:08,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:08,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:08,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:08,311 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 103 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-20 21:36:08,311 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:08,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,308 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 113 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-20 21:36:09,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332460320] [2020-07-20 21:36:09,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:09,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:09,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308720907] [2020-07-20 21:36:09,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:09,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:09,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:09,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:09,312 INFO L87 Difference]: Start difference. First operand 54 states and 85 transitions. Second operand 15 states. [2020-07-20 21:36:09,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:09,591 INFO L93 Difference]: Finished difference Result 94 states and 199 transitions. [2020-07-20 21:36:09,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:09,592 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 21:36:09,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:09,594 INFO L225 Difference]: With dead ends: 94 [2020-07-20 21:36:09,594 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:36:09,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:09,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:36:09,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-20 21:36:09,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 21:36:09,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 95 transitions. [2020-07-20 21:36:09,608 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 95 transitions. Word has length 135 [2020-07-20 21:36:09,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:09,609 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 95 transitions. [2020-07-20 21:36:09,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:09,609 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 95 transitions. [2020-07-20 21:36:09,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:09,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:09,613 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:09,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:09,827 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:09,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:09,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1608635723, now seen corresponding path program 2 times [2020-07-20 21:36:09,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:09,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1515137435] [2020-07-20 21:36:09,830 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:09,925 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:09,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:09,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:09,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:10,007 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 78 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 21:36:10,008 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:10,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,658 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 82 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2020-07-20 21:36:10,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1515137435] [2020-07-20 21:36:10,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:10,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:10,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132765335] [2020-07-20 21:36:10,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:10,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:10,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:10,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:10,661 INFO L87 Difference]: Start difference. First operand 62 states and 95 transitions. Second operand 13 states. [2020-07-20 21:36:10,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:10,872 INFO L93 Difference]: Finished difference Result 92 states and 161 transitions. [2020-07-20 21:36:10,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:10,873 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-20 21:36:10,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:10,875 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:36:10,875 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:36:10,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:10,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:36:10,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 65. [2020-07-20 21:36:10,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:36:10,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 103 transitions. [2020-07-20 21:36:10,889 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 103 transitions. Word has length 121 [2020-07-20 21:36:10,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:10,889 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 103 transitions. [2020-07-20 21:36:10,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:10,890 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 103 transitions. [2020-07-20 21:36:10,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-07-20 21:36:10,893 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:10,893 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:11,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:11,106 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:11,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:11,107 INFO L82 PathProgramCache]: Analyzing trace with hash -46122593, now seen corresponding path program 3 times [2020-07-20 21:36:11,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:11,108 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [335970976] [2020-07-20 21:36:11,108 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:11,182 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:11,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:11,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:11,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:11,259 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-20 21:36:11,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:11,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,690 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2020-07-20 21:36:11,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [335970976] [2020-07-20 21:36:11,691 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:11,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:11,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064299185] [2020-07-20 21:36:11,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:11,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:11,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:11,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:11,694 INFO L87 Difference]: Start difference. First operand 65 states and 103 transitions. Second operand 11 states. [2020-07-20 21:36:11,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:11,843 INFO L93 Difference]: Finished difference Result 84 states and 140 transitions. [2020-07-20 21:36:11,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:11,844 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 95 [2020-07-20 21:36:11,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:11,846 INFO L225 Difference]: With dead ends: 84 [2020-07-20 21:36:11,846 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 21:36:11,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:11,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 21:36:11,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-20 21:36:11,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 21:36:11,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 122 transitions. [2020-07-20 21:36:11,860 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 122 transitions. Word has length 95 [2020-07-20 21:36:11,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:11,860 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 122 transitions. [2020-07-20 21:36:11,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:11,861 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 122 transitions. [2020-07-20 21:36:11,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 21:36:11,863 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:11,863 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:12,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:12,074 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:12,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:12,075 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 4 times [2020-07-20 21:36:12,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:12,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231886989] [2020-07-20 21:36:12,077 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:12,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:12,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:12,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:12,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:12,215 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 83 proven. 24 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 21:36:12,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:12,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,882 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 85 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-20 21:36:12,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231886989] [2020-07-20 21:36:12,883 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:12,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:12,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1876760202] [2020-07-20 21:36:12,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:12,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:12,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:12,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:12,886 INFO L87 Difference]: Start difference. First operand 72 states and 122 transitions. Second operand 13 states. [2020-07-20 21:36:13,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:13,097 INFO L93 Difference]: Finished difference Result 92 states and 158 transitions. [2020-07-20 21:36:13,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:13,099 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 107 [2020-07-20 21:36:13,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:13,102 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:36:13,102 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:36:13,103 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 193 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:13,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:36:13,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2020-07-20 21:36:13,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 21:36:13,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-20 21:36:13,114 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 107 [2020-07-20 21:36:13,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:13,115 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-20 21:36:13,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:13,115 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-20 21:36:13,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:36:13,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:13,118 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:13,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:13,330 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:13,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:13,331 INFO L82 PathProgramCache]: Analyzing trace with hash 235412830, now seen corresponding path program 5 times [2020-07-20 21:36:13,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:13,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1231175495] [2020-07-20 21:36:13,333 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:13,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:13,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:13,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:13,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:13,494 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 19 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2020-07-20 21:36:13,495 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:13,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,921 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 20 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 21:36:13,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1231175495] [2020-07-20 21:36:13,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:13,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:13,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933714594] [2020-07-20 21:36:13,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:13,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:13,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:13,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:13,929 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 11 states. [2020-07-20 21:36:14,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:14,071 INFO L93 Difference]: Finished difference Result 91 states and 155 transitions. [2020-07-20 21:36:14,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:14,075 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 108 [2020-07-20 21:36:14,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:14,082 INFO L225 Difference]: With dead ends: 91 [2020-07-20 21:36:14,083 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 21:36:14,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 199 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:14,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 21:36:14,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2020-07-20 21:36:14,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 21:36:14,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-20 21:36:14,107 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 108 [2020-07-20 21:36:14,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:14,110 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-20 21:36:14,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:14,110 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-20 21:36:14,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 21:36:14,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:14,114 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:14,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:14,329 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:14,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:14,330 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 6 times [2020-07-20 21:36:14,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:14,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849196961] [2020-07-20 21:36:14,330 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) 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 21:36:14,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:14,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 21:36:14,448 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:36:14,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 21:36:14,477 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:36:14,549 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 21:36:14,551 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 21:36:14,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:14,818 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:36:14 BoogieIcfgContainer [2020-07-20 21:36:14,818 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:36:14,827 INFO L168 Benchmark]: Toolchain (without parser) took 18319.22 ms. Allocated memory was 136.3 MB in the beginning and 371.7 MB in the end (delta: 235.4 MB). Free memory was 100.3 MB in the beginning and 127.1 MB in the end (delta: -26.7 MB). Peak memory consumption was 208.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:14,828 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 21:36:14,829 INFO L168 Benchmark]: CACSL2BoogieTranslator took 276.49 ms. Allocated memory is still 136.3 MB. Free memory was 99.9 MB in the beginning and 90.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:14,829 INFO L168 Benchmark]: Boogie Preprocessor took 26.21 ms. Allocated memory is still 136.3 MB. Free memory was 90.3 MB in the beginning and 88.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:14,832 INFO L168 Benchmark]: RCFGBuilder took 427.83 ms. Allocated memory was 136.3 MB in the beginning and 201.3 MB in the end (delta: 65.0 MB). Free memory was 88.9 MB in the beginning and 167.1 MB in the end (delta: -78.1 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:14,833 INFO L168 Benchmark]: TraceAbstraction took 17574.65 ms. Allocated memory was 201.3 MB in the beginning and 371.7 MB in the end (delta: 170.4 MB). Free memory was 167.1 MB in the beginning and 127.1 MB in the end (delta: 40.0 MB). Peak memory consumption was 210.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:14,840 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 136.3 MB. Free memory was 118.1 MB in the beginning and 117.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 276.49 ms. Allocated memory is still 136.3 MB. Free memory was 99.9 MB in the beginning and 90.3 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.21 ms. Allocated memory is still 136.3 MB. Free memory was 90.3 MB in the beginning and 88.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 427.83 ms. Allocated memory was 136.3 MB in the beginning and 201.3 MB in the end (delta: 65.0 MB). Free memory was 88.9 MB in the beginning and 167.1 MB in the end (delta: -78.1 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 17574.65 ms. Allocated memory was 201.3 MB in the beginning and 371.7 MB in the end (delta: 170.4 MB). Free memory was 167.1 MB in the beginning and 127.1 MB in the end (delta: 40.0 MB). Peak memory consumption was 210.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 5; VAL [x=5] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L37] int result = fibo1(x); [L38] COND TRUE result == 5 VAL [result=5, x=5] [L39] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 17.4s, OverallIterations: 17, TraceHistogramMax: 11, AutomataDifference: 3.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 372 SDtfs, 566 SDslu, 1730 SDs, 0 SdLazy, 1676 SolverSat, 422 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2277 GetRequests, 1968 SyntacticMatches, 107 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=73occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 16 MinimizatonAttempts, 185 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 8.8s InterpolantComputationTime, 1235 NumberOfCodeBlocks, 975 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 2195 ConstructedInterpolants, 0 QuantifiedInterpolants, 369157 SizeOfPredicates, 67 NumberOfNonLiveVariables, 2170 ConjunctsInSsa, 134 ConjunctsInUnsatCore, 30 InterpolantComputations, 2 PerfectInterpolantSequences, 3471/4520 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...