/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:43:30,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:43:30,951 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:43:30,974 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:43:30,974 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:43:30,976 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:43:30,978 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:43:30,982 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:43:30,989 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:43:30,991 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:43:30,992 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:43:30,993 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:43:30,996 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:43:30,997 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:43:30,999 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:43:31,001 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:43:31,002 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:43:31,003 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:43:31,005 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:43:31,006 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:43:31,008 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:43:31,009 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:43:31,010 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:43:31,011 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:43:31,014 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:43:31,021 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:43:31,022 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:43:31,023 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:43:31,024 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 [2020-07-21 19:43:31,042 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:43:31,042 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:43:31,044 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:43:31,044 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:43:31,044 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:43:31,044 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:43:31,045 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:43:31,045 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:43:31,045 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:43:31,045 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:43:31,045 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:43:31,046 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:43:31,046 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:43:31,046 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:43:31,046 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:43:31,046 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:43:31,047 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:43:31,047 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:43:31,047 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:43:31,047 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:43:31,048 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:43:31,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:31,048 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:43:31,048 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:43:31,048 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:43:31,049 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:43:31,049 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:31,049 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:43:31,049 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:43:31,049 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 -> 2 [2020-07-21 19:43:31,392 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:43:31,421 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:43:31,426 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:43:31,429 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:43:31,429 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:43:31,430 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 19:43:31,502 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46c968b7c/1db731b03d154fd081f7b08887dcf239/FLAGc7f4a1a27 [2020-07-21 19:43:31,985 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:43:31,987 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 19:43:31,998 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46c968b7c/1db731b03d154fd081f7b08887dcf239/FLAGc7f4a1a27 [2020-07-21 19:43:32,358 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46c968b7c/1db731b03d154fd081f7b08887dcf239 [2020-07-21 19:43:32,371 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:43:32,374 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:43:32,375 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:32,375 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:43:32,379 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:43:32,380 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,384 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49b51b03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32, skipping insertion in model container [2020-07-21 19:43:32,384 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,392 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:43:32,411 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:43:32,606 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:32,612 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:43:32,633 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:32,652 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:43:32,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32 WrapperNode [2020-07-21 19:43:32,653 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:32,655 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:43:32,655 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:43:32,655 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:43:32,672 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,672 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,679 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,680 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,684 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,687 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,689 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (1/1) ... [2020-07-21 19:43:32,690 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:43:32,691 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:43:32,691 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:43:32,691 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:43:32,693 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (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 [2020-07-21 19:43:32,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:43:32,927 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:43:32,927 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:43:32,927 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:43:32,928 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:43:32,928 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:43:32,929 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:43:32,929 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:43:32,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:43:32,929 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:43:33,145 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:43:33,146 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:43:33,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:33 BoogieIcfgContainer [2020-07-21 19:43:33,151 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:43:33,153 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:43:33,153 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:43:33,157 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:43:33,158 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:43:32" (1/3) ... [2020-07-21 19:43:33,160 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418598b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:33, skipping insertion in model container [2020-07-21 19:43:33,160 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:32" (2/3) ... [2020-07-21 19:43:33,161 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@418598b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:33, skipping insertion in model container [2020-07-21 19:43:33,161 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:33" (3/3) ... [2020-07-21 19:43:33,163 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-21 19:43:33,178 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:43:33,190 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:43:33,243 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:43:33,327 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:43:33,327 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:43:33,328 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:43:33,328 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:43:33,329 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:43:33,329 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:43:33,329 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:43:33,329 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:43:33,355 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:43:33,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:43:33,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:33,366 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:33,366 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:33,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:33,387 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:43:33,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:33,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [126676880] [2020-07-21 19:43:33,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:33,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:33,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:33,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:33,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:33,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:33,738 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:33,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [126676880] [2020-07-21 19:43:33,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:33,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:33,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002661667] [2020-07-21 19:43:33,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:33,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:33,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:33,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:33,770 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:43:33,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:33,883 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:43:33,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:33,886 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:43:33,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:33,900 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:43:33,900 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:43:33,905 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 [2020-07-21 19:43:33,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:43:33,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:43:33,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:43:33,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:43:33,968 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:43:33,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:33,969 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:43:33,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:33,969 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:43:33,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:43:33,972 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:33,972 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:34,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:34,188 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:34,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:34,189 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:43:34,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:34,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1627927829] [2020-07-21 19:43:34,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:34,246 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:34,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:34,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:34,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:34,289 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:43:34,289 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:34,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1627927829] [2020-07-21 19:43:34,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:34,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:34,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825765259] [2020-07-21 19:43:34,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:34,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:34,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:34,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:34,295 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:43:34,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:34,358 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:43:34,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:34,359 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:43:34,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:34,362 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:43:34,362 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:43:34,364 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 [2020-07-21 19:43:34,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:43:34,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:43:34,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:43:34,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:43:34,374 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:43:34,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:34,374 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:43:34,374 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:34,375 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:43:34,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:43:34,376 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:34,377 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:34,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:34,593 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:34,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:34,595 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:43:34,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:34,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458696911] [2020-07-21 19:43:34,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:34,637 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:34,638 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:34,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:34,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:34,703 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:43:34,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:34,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,964 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:43:34,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458696911] [2020-07-21 19:43:34,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:34,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:43:34,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626984545] [2020-07-21 19:43:34,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:43:34,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:34,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:43:34,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:34,970 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:43:35,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:35,123 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:43:35,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:43:35,125 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:43:35,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:35,127 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:43:35,128 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:43:35,129 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:35,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:43:35,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:43:35,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:35,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:43:35,142 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:43:35,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:35,143 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:43:35,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:43:35,143 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:43:35,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:35,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:35,145 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:35,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:35,361 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:35,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:35,362 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:43:35,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:35,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436144515] [2020-07-21 19:43:35,364 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:35,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:35,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:35,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:35,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:35,465 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:43:35,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:35,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:35,640 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:43:35,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436144515] [2020-07-21 19:43:35,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:35,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:43:35,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982453891] [2020-07-21 19:43:35,642 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:43:35,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:35,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:43:35,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:43:35,644 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:43:35,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:35,732 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:43:35,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:43:35,734 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:43:35,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:35,737 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:43:35,737 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:43:35,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:35,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:43:35,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:43:35,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:43:35,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:43:35,750 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:43:35,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:35,750 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:43:35,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:43:35,751 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:43:35,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:43:35,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:35,753 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:35,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:35,968 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:35,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:35,969 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:43:35,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:35,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858871453] [2020-07-21 19:43:35,970 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:36,026 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:36,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:36,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:36,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:36,081 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:43:36,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:36,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:36,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:36,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:36,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:36,451 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:43:36,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858871453] [2020-07-21 19:43:36,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:36,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:43:36,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539107611] [2020-07-21 19:43:36,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:43:36,455 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:36,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:43:36,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:36,456 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:43:36,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:36,664 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:43:36,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:36,666 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:43:36,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:36,668 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:43:36,669 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:43:36,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:36,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:43:36,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:43:36,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:43:36,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:43:36,680 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:43:36,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:36,681 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:43:36,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:43:36,681 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:43:36,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:43:36,683 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:36,683 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:36,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:36,898 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:36,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:36,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:43:36,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:36,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127822490] [2020-07-21 19:43:36,900 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:36,940 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:36,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:36,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:36,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:36,998 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 19:43:36,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:37,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:37,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:37,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:37,363 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:43:37,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127822490] [2020-07-21 19:43:37,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:37,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:43:37,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296888181] [2020-07-21 19:43:37,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:43:37,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:37,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:43:37,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:43:37,367 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:43:37,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:37,508 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:43:37,509 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:37,509 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:43:37,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:37,511 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:43:37,511 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:43:37,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:37,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:43:37,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:43:37,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:43:37,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:43:37,526 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:43:37,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:37,527 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:43:37,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:43:37,527 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:43:37,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:43:37,529 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:37,529 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:37,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:37,745 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:37,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:37,746 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:43:37,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:37,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947703073] [2020-07-21 19:43:37,747 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:37,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:37,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:37,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:37,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:37,872 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 19:43:37,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:38,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,575 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 19:43:38,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947703073] [2020-07-21 19:43:38,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:38,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:43:38,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986454332] [2020-07-21 19:43:38,577 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:43:38,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:38,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:43:38,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:43:38,579 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:43:38,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:38,761 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:43:38,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:38,762 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:43:38,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:38,765 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:43:38,765 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:43:38,766 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:43:38,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:43:38,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:43:38,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:43:38,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:43:38,780 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:43:38,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:38,780 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:43:38,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:43:38,780 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:43:38,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:43:38,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:38,784 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:38,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:38,986 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:38,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:38,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:43:38,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:38,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114177401] [2020-07-21 19:43:38,989 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:39,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:39,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:39,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:39,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:39,137 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 19:43:39,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:39,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,754 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,801 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 19:43:39,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114177401] [2020-07-21 19:43:39,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:39,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 19:43:39,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [117657165] [2020-07-21 19:43:39,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:43:39,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:39,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:43:39,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:43:39,804 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-21 19:43:39,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:39,932 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:43:39,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:39,934 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-21 19:43:39,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:39,937 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:43:39,937 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:43:39,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:43:39,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:43:39,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:43:39,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:43:39,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:43:39,959 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:43:39,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:39,960 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:43:39,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:43:39,960 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:43:39,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:43:39,963 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:39,963 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:40,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,165 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:40,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:40,166 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:43:40,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:40,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810504196] [2020-07-21 19:43:40,168 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:40,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:40,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:40,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:40,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:40,389 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 19:43:40,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:41,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:41,433 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 19:43:41,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810504196] [2020-07-21 19:43:41,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:41,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 19:43:41,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826506300] [2020-07-21 19:43:41,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:41,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:41,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:41,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:41,436 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-21 19:43:41,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:41,702 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:43:41,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:41,703 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-21 19:43:41,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:41,707 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:43:41,707 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:43:41,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:41,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:43:41,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:43:41,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:43:41,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:43:41,724 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:43:41,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:41,724 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:43:41,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:41,725 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:43:41,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:43:41,728 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:41,728 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:41,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:41,943 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:41,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:41,944 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:43:41,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:41,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500670024] [2020-07-21 19:43:41,945 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:42,044 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:42,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:42,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:42,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:42,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-21 19:43:42,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:42,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-21 19:43:43,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500670024] [2020-07-21 19:43:43,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:43,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 19:43:43,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250104280] [2020-07-21 19:43:43,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:43,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:43,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:43,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:43,369 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-21 19:43:43,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:43,581 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-21 19:43:43,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:43,582 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-21 19:43:43,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:43,584 INFO L225 Difference]: With dead ends: 88 [2020-07-21 19:43:43,584 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 19:43:43,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:43,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 19:43:43,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 19:43:43,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 19:43:43,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-21 19:43:43,600 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-21 19:43:43,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:43,600 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-21 19:43:43,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:43,601 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-21 19:43:43,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 19:43:43,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:43,605 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:43,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:43,821 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:43,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:43,822 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-21 19:43:43,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:43,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62320531] [2020-07-21 19:43:43,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:43,909 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:43,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:43,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:43,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:44,008 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 104 refuted. 0 times theorem prover too weak. 555 trivial. 0 not checked. [2020-07-21 19:43:44,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:44,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:44,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:45,052 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-21 19:43:45,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62320531] [2020-07-21 19:43:45,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:45,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 19:43:45,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637215447] [2020-07-21 19:43:45,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:45,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:45,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:45,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:45,055 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-21 19:43:45,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:45,245 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-21 19:43:45,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:45,246 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-21 19:43:45,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:45,248 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:43:45,248 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 19:43:45,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:45,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 19:43:45,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-21 19:43:45,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 19:43:45,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-21 19:43:45,260 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-21 19:43:45,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:45,261 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-21 19:43:45,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:45,261 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-21 19:43:45,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 19:43:45,264 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:45,264 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:45,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:45,478 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:45,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:45,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-21 19:43:45,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:45,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134084188] [2020-07-21 19:43:45,480 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:45,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:45,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:45,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 19:43:45,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:45,742 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 19:43:45,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:46,663 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 19:43:46,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134084188] [2020-07-21 19:43:46,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:46,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-21 19:43:46,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695106237] [2020-07-21 19:43:46,667 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 19:43:46,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:46,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 19:43:46,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:43:46,668 INFO L87 Difference]: Start difference. First operand 54 states and 77 transitions. Second operand 20 states. [2020-07-21 19:43:46,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:46,962 INFO L93 Difference]: Finished difference Result 112 states and 191 transitions. [2020-07-21 19:43:46,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 19:43:46,963 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-21 19:43:46,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:46,968 INFO L225 Difference]: With dead ends: 112 [2020-07-21 19:43:46,968 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 19:43:46,970 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:43:46,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 19:43:46,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2020-07-21 19:43:46,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 19:43:46,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-21 19:43:46,993 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 109 [2020-07-21 19:43:46,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:46,994 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-21 19:43:46,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 19:43:46,994 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-21 19:43:46,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:43:46,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:46,999 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:47,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,213 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:47,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:47,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1349477645, now seen corresponding path program 7 times [2020-07-21 19:43:47,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:47,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856128896] [2020-07-21 19:43:47,216 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:47,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:47,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:47,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 19:43:47,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:47,393 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 233 proven. 55 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 19:43:47,393 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:47,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:48,293 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 230 proven. 70 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 19:43:48,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856128896] [2020-07-21 19:43:48,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:48,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 19:43:48,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938831796] [2020-07-21 19:43:48,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:48,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:48,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:48,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:48,298 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 14 states. [2020-07-21 19:43:48,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:48,482 INFO L93 Difference]: Finished difference Result 97 states and 160 transitions. [2020-07-21 19:43:48,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:48,483 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 19:43:48,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:48,487 INFO L225 Difference]: With dead ends: 97 [2020-07-21 19:43:48,487 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 19:43:48,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:48,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 19:43:48,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 71. [2020-07-21 19:43:48,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:43:48,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 123 transitions. [2020-07-21 19:43:48,524 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 123 transitions. Word has length 121 [2020-07-21 19:43:48,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:48,525 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 123 transitions. [2020-07-21 19:43:48,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:48,526 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 123 transitions. [2020-07-21 19:43:48,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:43:48,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:48,534 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:48,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:48,751 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:48,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:48,751 INFO L82 PathProgramCache]: Analyzing trace with hash -280177283, now seen corresponding path program 8 times [2020-07-21 19:43:48,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:48,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1913154757] [2020-07-21 19:43:48,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:48,856 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:48,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:48,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 19:43:48,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:48,929 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 147 proven. 141 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 19:43:48,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:49,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,697 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:49,736 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 146 proven. 154 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 19:43:49,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1913154757] [2020-07-21 19:43:49,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:49,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 19:43:49,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395729877] [2020-07-21 19:43:49,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:49,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:49,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:49,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:49,739 INFO L87 Difference]: Start difference. First operand 71 states and 123 transitions. Second operand 14 states. [2020-07-21 19:43:49,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:49,907 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 19:43:49,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:49,908 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 19:43:49,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:49,910 INFO L225 Difference]: With dead ends: 107 [2020-07-21 19:43:49,910 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 19:43:49,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:49,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 19:43:49,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-07-21 19:43:49,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:43:49,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 95 transitions. [2020-07-21 19:43:49,938 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 95 transitions. Word has length 121 [2020-07-21 19:43:49,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:49,941 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 95 transitions. [2020-07-21 19:43:49,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:49,941 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 95 transitions. [2020-07-21 19:43:49,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-21 19:43:49,944 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:49,944 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:50,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:50,159 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:50,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:50,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1402909364, now seen corresponding path program 9 times [2020-07-21 19:43:50,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:50,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975377131] [2020-07-21 19:43:50,162 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:50,286 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:50,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:50,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:50,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:50,364 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 78 proven. 198 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2020-07-21 19:43:50,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:50,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:50,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,398 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 84 proven. 218 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2020-07-21 19:43:51,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975377131] [2020-07-21 19:43:51,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:51,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 19:43:51,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561030168] [2020-07-21 19:43:51,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:51,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:51,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:51,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:51,402 INFO L87 Difference]: Start difference. First operand 61 states and 95 transitions. Second operand 14 states. [2020-07-21 19:43:51,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:51,610 INFO L93 Difference]: Finished difference Result 109 states and 171 transitions. [2020-07-21 19:43:51,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:51,612 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 110 [2020-07-21 19:43:51,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:51,614 INFO L225 Difference]: With dead ends: 109 [2020-07-21 19:43:51,614 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:43:51,622 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:51,623 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:43:51,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-21 19:43:51,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 19:43:51,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2020-07-21 19:43:51,638 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 110 [2020-07-21 19:43:51,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:51,638 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2020-07-21 19:43:51,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:51,639 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2020-07-21 19:43:51,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:43:51,642 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:51,643 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:51,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:51,859 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:51,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:51,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1072341053, now seen corresponding path program 10 times [2020-07-21 19:43:51,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:51,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1680686768] [2020-07-21 19:43:51,861 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:51,964 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:51,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:51,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 19:43:51,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:52,037 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 113 proven. 175 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 19:43:52,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:52,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,867 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 114 proven. 186 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 19:43:52,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1680686768] [2020-07-21 19:43:52,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:52,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 19:43:52,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948225250] [2020-07-21 19:43:52,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:52,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:52,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:52,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:52,877 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 14 states. [2020-07-21 19:43:53,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:53,020 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2020-07-21 19:43:53,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:53,020 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 19:43:53,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:53,022 INFO L225 Difference]: With dead ends: 75 [2020-07-21 19:43:53,024 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:43:53,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:53,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:43:53,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-21 19:43:53,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 19:43:53,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2020-07-21 19:43:53,036 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 121 [2020-07-21 19:43:53,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:53,036 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2020-07-21 19:43:53,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:53,036 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2020-07-21 19:43:53,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:43:53,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:53,039 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:53,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:53,255 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:53,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:53,257 INFO L82 PathProgramCache]: Analyzing trace with hash -419017667, now seen corresponding path program 11 times [2020-07-21 19:43:53,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:53,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698563705] [2020-07-21 19:43:53,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 19:43:53,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:53,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:53,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 19:43:53,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:53,442 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 116 proven. 217 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-07-21 19:43:53,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:54,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:54,704 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 112 proven. 243 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2020-07-21 19:43:54,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698563705] [2020-07-21 19:43:54,715 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:54,715 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 19:43:54,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1919674019] [2020-07-21 19:43:54,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:43:54,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:54,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:43:54,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:43:54,719 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand 16 states. [2020-07-21 19:43:54,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:54,911 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2020-07-21 19:43:54,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:54,913 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-21 19:43:54,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:54,914 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:43:54,914 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 19:43:54,917 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 216 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:43:54,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 19:43:54,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 19:43:54,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 19:43:54,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 19:43:54,919 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-21 19:43:54,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:54,919 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 19:43:54,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:43:54,919 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 19:43:54,920 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 19:43:55,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:55,134 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 19:43:55,525 WARN L193 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 34 [2020-07-21 19:43:55,802 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 130 DAG size of output: 67 [2020-07-21 19:43:55,923 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 42 [2020-07-21 19:43:56,062 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 19:43:56,224 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 56 [2020-07-21 19:43:56,391 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 110 DAG size of output: 41 [2020-07-21 19:43:56,632 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 127 DAG size of output: 52 [2020-07-21 19:43:58,904 WARN L193 SmtUtils]: Spent 851.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 31 [2020-07-21 19:43:58,932 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 19:43:58,932 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:43:58,932 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 19:43:58,932 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 19:43:58,932 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 19:43:58,933 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 19:43:58,933 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 19:43:58,933 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 19:43:58,933 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 19:43:58,933 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-21 19:43:58,934 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 19:43:58,934 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 19:43:58,935 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 19:43:58,935 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse0 (and (= |fibo_#t~ret0| 2) (<= |fibo_#in~n| 4))) (.cse1 (<= |fibo_#in~n| 3))) (and (or .cse0 (and (<= 3 |fibo_#in~n|) .cse1) (<= 5 |fibo_#in~n|) (and (<= |fibo_#in~n| 2) (<= 2 |fibo_#in~n|))) (or .cse0 (<= 6 |fibo_#in~n|) (= |fibo_#t~ret0| 3) .cse1) (let ((.cse2 (<= fibo_~n |fibo_#in~n|)) (.cse3 (<= |fibo_#in~n| fibo_~n))) (or (and (<= 4 |fibo_#in~n|) .cse2 .cse3) (and (= |fibo_#t~ret0| 1) .cse2 .cse3))))) [2020-07-21 19:43:58,935 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 19:43:58,935 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 19:43:58,935 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 19:43:58,935 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 19:43:58,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:43:58 BoogieIcfgContainer [2020-07-21 19:43:58,946 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:43:58,948 INFO L168 Benchmark]: Toolchain (without parser) took 26575.25 ms. Allocated memory was 137.4 MB in the beginning and 442.5 MB in the end (delta: 305.1 MB). Free memory was 102.8 MB in the beginning and 205.2 MB in the end (delta: -102.4 MB). Peak memory consumption was 299.2 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:58,948 INFO L168 Benchmark]: CDTParser took 0.68 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 19:43:58,949 INFO L168 Benchmark]: CACSL2BoogieTranslator took 279.10 ms. Allocated memory is still 137.4 MB. Free memory was 102.4 MB in the beginning and 92.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:58,950 INFO L168 Benchmark]: Boogie Preprocessor took 35.87 ms. Allocated memory is still 137.4 MB. Free memory was 92.8 MB in the beginning and 91.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:58,951 INFO L168 Benchmark]: RCFGBuilder took 460.23 ms. Allocated memory was 137.4 MB in the beginning and 203.9 MB in the end (delta: 66.6 MB). Free memory was 91.5 MB in the beginning and 171.9 MB in the end (delta: -80.5 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:58,952 INFO L168 Benchmark]: TraceAbstraction took 25792.83 ms. Allocated memory was 203.9 MB in the beginning and 442.5 MB in the end (delta: 238.6 MB). Free memory was 171.2 MB in the beginning and 205.2 MB in the end (delta: -34.0 MB). Peak memory consumption was 301.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:43:58,956 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.68 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 279.10 ms. Allocated memory is still 137.4 MB. Free memory was 102.4 MB in the beginning and 92.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.87 ms. Allocated memory is still 137.4 MB. Free memory was 92.8 MB in the beginning and 91.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 460.23 ms. Allocated memory was 137.4 MB in the beginning and 203.9 MB in the end (delta: 66.6 MB). Free memory was 91.5 MB in the beginning and 171.9 MB in the end (delta: -80.5 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 25792.83 ms. Allocated memory was 203.9 MB in the beginning and 442.5 MB in the end (delta: 238.6 MB). Free memory was 171.2 MB in the beginning and 205.2 MB in the end (delta: -34.0 MB). Peak memory consumption was 301.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 21.8s, OverallIterations: 17, TraceHistogramMax: 27, AutomataDifference: 3.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 3.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 377 SDtfs, 425 SDslu, 1645 SDs, 0 SdLazy, 1635 SolverSat, 427 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2958 GetRequests, 2601 SyntacticMatches, 123 SemanticMatches, 234 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 704 ImplicationChecksByTransitivity, 3.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=12, 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, 17 MinimizatonAttempts, 135 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 95 PreInvPairs, 1452 NumberOfFragments, 86 HoareAnnotationTreeSize, 95 FomulaSimplifications, 595296 FormulaSimplificationTreeSizeReduction, 2.9s HoareSimplificationTime, 8 FomulaSimplificationsInter, 5107 FormulaSimplificationTreeSizeReductionInter, 0.8s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 13.1s InterpolantComputationTime, 1467 NumberOfCodeBlocks, 1454 NumberOfCodeBlocksAsserted, 32 NumberOfCheckSat, 2875 ConstructedInterpolants, 0 QuantifiedInterpolants, 609941 SizeOfPredicates, 73 NumberOfNonLiveVariables, 3256 ConjunctsInSsa, 213 ConjunctsInUnsatCore, 32 InterpolantComputations, 2 PerfectInterpolantSequences, 12357/16608 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 correct! Received shutdown request...