/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:19:15,136 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:19:15,138 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:19:15,150 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:19:15,150 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:19:15,151 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:19:15,153 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:19:15,154 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:19:15,156 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:19:15,157 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:19:15,158 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:19:15,159 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:19:15,159 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:19:15,160 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:19:15,161 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:19:15,162 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:19:15,163 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:19:15,164 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:19:15,165 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:19:15,167 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:19:15,169 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:19:15,170 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:19:15,171 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:19:15,171 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:19:15,174 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 22:19:15,174 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 22:19:15,174 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 22:19:15,175 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 22:19:15,175 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 22:19:15,176 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 22:19:15,176 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 22:19:15,177 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 22:19:15,178 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 22:19:15,178 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 22:19:15,179 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 22:19:15,180 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 22:19:15,180 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 22:19:15,180 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 22:19:15,181 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:19:15,182 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:19:15,182 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:19:15,183 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 22:19:15,202 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:19:15,202 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:19:15,203 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:19:15,203 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:19:15,203 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:19:15,204 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:19:15,204 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:19:15,204 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:19:15,205 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:19:15,205 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:19:15,205 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:19:15,205 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:19:15,205 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:19:15,206 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:19:15,206 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:19:15,206 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:19:15,206 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:19:15,207 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:19:15,207 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:19:15,208 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:19:15,208 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:19:15,208 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:19:15,208 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:19:15,208 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:19:15,209 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:19:15,209 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:19:15,209 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:15,209 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:19:15,209 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:19:15,209 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 -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 22:19:15,529 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:19:15,542 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:19:15,546 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:19:15,547 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:19:15,547 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:19:15,548 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-21 22:19:15,620 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ba516d83/dd65ff1193524c45af642804140f1d96/FLAG19dca100e [2020-07-21 22:19:16,072 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:19:16,073 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-21 22:19:16,079 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ba516d83/dd65ff1193524c45af642804140f1d96/FLAG19dca100e [2020-07-21 22:19:16,427 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ba516d83/dd65ff1193524c45af642804140f1d96 [2020-07-21 22:19:16,435 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:19:16,438 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:19:16,439 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:19:16,440 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:19:16,443 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:19:16,444 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,447 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1a71c6d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16, skipping insertion in model container [2020-07-21 22:19:16,447 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,455 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:19:16,470 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:19:16,634 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:19:16,639 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:19:16,656 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:19:16,668 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:19:16,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16 WrapperNode [2020-07-21 22:19:16,669 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:19:16,669 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:19:16,669 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:19:16,669 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:19:16,679 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,679 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,685 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,685 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,688 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,691 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,691 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (1/1) ... [2020-07-21 22:19:16,693 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:19:16,694 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:19:16,694 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:19:16,694 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:19:16,695 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (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 22:19:16,865 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:19:16,866 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:19:16,866 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 22:19:16,866 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 22:19:16,866 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:19:16,866 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:19:16,867 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:19:16,867 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 22:19:16,867 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 22:19:16,867 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:19:16,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:19:16,867 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:19:17,073 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:19:17,073 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:19:17,077 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:19:17 BoogieIcfgContainer [2020-07-21 22:19:17,077 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:19:17,079 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:19:17,079 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:19:17,083 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:19:17,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:19:16" (1/3) ... [2020-07-21 22:19:17,084 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39b8505b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:19:17, skipping insertion in model container [2020-07-21 22:19:17,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:19:16" (2/3) ... [2020-07-21 22:19:17,085 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39b8505b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:19:17, skipping insertion in model container [2020-07-21 22:19:17,085 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:19:17" (3/3) ... [2020-07-21 22:19:17,087 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-07-21 22:19:17,099 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:19:17,107 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:19:17,131 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:19:17,170 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:19:17,171 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:19:17,171 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:19:17,171 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:19:17,171 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:19:17,172 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:19:17,172 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:19:17,172 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:19:17,197 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 22:19:17,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:19:17,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:17,206 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:17,207 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:17,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:17,214 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 22:19:17,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:17,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983547451] [2020-07-21 22:19:17,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:17,350 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:17,351 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:17,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:19:17,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:17,440 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 22:19:17,440 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:19:17,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983547451] [2020-07-21 22:19:17,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:19:17,442 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:19:17,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1808904929] [2020-07-21 22:19:17,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:19:17,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:17,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:19:17,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:19:17,463 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 22:19:17,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:17,570 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 22:19:17,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:19:17,572 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:19:17,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:17,583 INFO L225 Difference]: With dead ends: 44 [2020-07-21 22:19:17,583 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 22:19:17,587 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 22:19:17,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 22:19:17,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 22:19:17,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:19:17,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:19:17,633 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 22:19:17,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:17,634 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:19:17,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:19:17,634 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:19:17,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:19:17,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:17,637 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:17,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:17,852 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:17,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:17,853 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 22:19:17,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:17,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1394593561] [2020-07-21 22:19:17,854 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:17,880 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:17,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:17,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:19:17,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:17,920 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 22:19:17,920 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:19:17,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1394593561] [2020-07-21 22:19:17,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:19:17,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:19:17,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793991887] [2020-07-21 22:19:17,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:19:17,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:17,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:19:17,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:19:17,926 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 22:19:18,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:18,017 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 22:19:18,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:19:18,018 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:19:18,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:18,020 INFO L225 Difference]: With dead ends: 36 [2020-07-21 22:19:18,022 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 22:19:18,023 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 22:19:18,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 22:19:18,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 22:19:18,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 22:19:18,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 22:19:18,041 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 22:19:18,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:18,041 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 22:19:18,041 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:19:18,042 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 22:19:18,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:19:18,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:18,045 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:18,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:18,251 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:18,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:18,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 22:19:18,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:18,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1192180065] [2020-07-21 22:19:18,255 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:18,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:18,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:18,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:18,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:18,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:18,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:18,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:18,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:18,643 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:18,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1192180065] [2020-07-21 22:19:18,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:18,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 22:19:18,645 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100693334] [2020-07-21 22:19:18,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:19:18,649 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:18,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:19:18,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:19:18,650 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 22:19:18,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:18,771 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 22:19:18,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:18,773 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 22:19:18,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:18,775 INFO L225 Difference]: With dead ends: 41 [2020-07-21 22:19:18,775 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 22:19:18,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:18,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 22:19:18,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 22:19:18,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:19:18,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:19:18,787 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 22:19:18,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:18,788 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:19:18,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:19:18,788 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:19:18,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:19:18,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:18,790 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:18,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:18,994 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:18,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:18,995 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 22:19:18,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:18,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960055837] [2020-07-21 22:19:18,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:19,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:19,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:19,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:19:19,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:19,068 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:19,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:19,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 22:19:19,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960055837] [2020-07-21 22:19:19,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:19,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 22:19:19,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593342484] [2020-07-21 22:19:19,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 22:19:19,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:19,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 22:19:19,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 22:19:19,229 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 22:19:19,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:19,340 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 22:19:19,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:19:19,341 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 22:19:19,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:19,343 INFO L225 Difference]: With dead ends: 46 [2020-07-21 22:19:19,343 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 22:19:19,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:19,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 22:19:19,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 22:19:19,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 22:19:19,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 22:19:19,353 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 22:19:19,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:19,353 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 22:19:19,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 22:19:19,354 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 22:19:19,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:19:19,355 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:19,356 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:19,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:19,569 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:19,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:19,570 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 22:19:19,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:19,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83307121] [2020-07-21 22:19:19,571 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:19,603 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:19,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:19,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:19,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:19,666 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:19:19,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:19,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:19,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:20,010 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:19:20,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83307121] [2020-07-21 22:19:20,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:20,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 22:19:20,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849516993] [2020-07-21 22:19:20,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:19:20,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:20,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:19:20,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:20,013 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 22:19:20,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:20,185 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 22:19:20,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:20,185 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 22:19:20,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:20,188 INFO L225 Difference]: With dead ends: 51 [2020-07-21 22:19:20,188 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 22:19:20,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:20,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 22:19:20,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 22:19:20,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:19:20,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 22:19:20,198 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 22:19:20,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:20,199 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 22:19:20,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:19:20,199 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 22:19:20,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 22:19:20,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:20,201 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:20,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:20,408 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:20,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:20,408 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 22:19:20,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:20,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023139675] [2020-07-21 22:19:20,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:20,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:20,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:20,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:20,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:20,497 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 22:19:20,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:20,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:20,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:20,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:20,801 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:19:20,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023139675] [2020-07-21 22:19:20,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:20,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 22:19:20,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122975761] [2020-07-21 22:19:20,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:19:20,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:20,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:19:20,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:19:20,804 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 22:19:20,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:20,963 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 22:19:20,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:20,965 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 22:19:20,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:20,971 INFO L225 Difference]: With dead ends: 56 [2020-07-21 22:19:20,971 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 22:19:20,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:20,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 22:19:20,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 22:19:20,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 22:19:20,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 22:19:20,995 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 22:19:20,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:20,996 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 22:19:20,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:19:20,997 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 22:19:21,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 22:19:21,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:21,002 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:21,219 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:21,220 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:21,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:21,221 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 22:19:21,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:21,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017747997] [2020-07-21 22:19:21,221 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:21,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:21,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:21,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:21,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:21,324 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 22:19:21,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:21,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:21,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:21,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:21,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:21,849 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 22:19:21,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017747997] [2020-07-21 22:19:21,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:21,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 22:19:21,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277844434] [2020-07-21 22:19:21,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:19:21,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:21,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:19:21,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:21,852 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 22:19:22,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:22,053 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 22:19:22,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:22,054 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 22:19:22,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:22,056 INFO L225 Difference]: With dead ends: 61 [2020-07-21 22:19:22,056 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 22:19:22,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:19:22,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 22:19:22,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 22:19:22,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:19:22,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 22:19:22,077 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 22:19:22,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:22,077 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 22:19:22,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:19:22,077 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 22:19:22,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 22:19:22,081 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:22,081 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:22,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:22,299 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:22,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:22,300 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 22:19:22,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:22,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392128257] [2020-07-21 22:19:22,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:22,333 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:22,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:22,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:22,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:22,403 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 22:19:22,404 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:22,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:22,891 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 22:19:22,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392128257] [2020-07-21 22:19:22,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:22,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:22,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524432396] [2020-07-21 22:19:22,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:22,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:22,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:22,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:22,896 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 13 states. [2020-07-21 22:19:23,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:23,090 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 22:19:23,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:23,091 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-21 22:19:23,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:23,093 INFO L225 Difference]: With dead ends: 66 [2020-07-21 22:19:23,094 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 22:19:23,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:23,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 22:19:23,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 22:19:23,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 22:19:23,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 22:19:23,105 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 22:19:23,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:23,106 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 22:19:23,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:23,106 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 22:19:23,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 22:19:23,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:23,108 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:23,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:23,322 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:23,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:23,323 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 22:19:23,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:23,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159828477] [2020-07-21 22:19:23,324 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:23,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:23,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:23,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:23,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:23,460 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 22:19:23,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:24,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:24,357 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 22:19:24,357 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159828477] [2020-07-21 22:19:24,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:24,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:24,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889919759] [2020-07-21 22:19:24,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:24,359 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:24,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:24,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:24,359 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 15 states. [2020-07-21 22:19:24,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:24,590 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 22:19:24,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:24,591 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2020-07-21 22:19:24,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:24,593 INFO L225 Difference]: With dead ends: 71 [2020-07-21 22:19:24,594 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 22:19:24,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:24,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 22:19:24,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 22:19:24,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 22:19:24,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 22:19:24,606 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 22:19:24,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:24,606 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 22:19:24,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:24,607 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 22:19:24,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 22:19:24,608 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:24,608 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:24,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:24,822 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:24,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:24,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 22:19:24,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:24,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [97817931] [2020-07-21 22:19:24,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:24,877 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:24,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:24,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:24,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 79 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2020-07-21 22:19:24,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:25,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:25,559 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 83 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2020-07-21 22:19:25,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [97817931] [2020-07-21 22:19:25,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:25,560 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:25,560 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241278532] [2020-07-21 22:19:25,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:25,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:25,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:25,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:25,562 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 13 states. [2020-07-21 22:19:25,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:25,729 INFO L93 Difference]: Finished difference Result 84 states and 164 transitions. [2020-07-21 22:19:25,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:25,733 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 108 [2020-07-21 22:19:25,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:25,735 INFO L225 Difference]: With dead ends: 84 [2020-07-21 22:19:25,735 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 22:19:25,736 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 196 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:25,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 22:19:25,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-07-21 22:19:25,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 22:19:25,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-21 22:19:25,771 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 108 [2020-07-21 22:19:25,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:25,772 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-21 22:19:25,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:25,772 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-21 22:19:25,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 22:19:25,773 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:25,774 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:25,974 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:25,975 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:25,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:25,975 INFO L82 PathProgramCache]: Analyzing trace with hash -60364660, now seen corresponding path program 1 times [2020-07-21 22:19:25,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:25,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [651019722] [2020-07-21 22:19:25,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:26,031 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:26,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:26,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:26,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:26,086 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 22:19:26,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:26,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:26,515 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 58 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-07-21 22:19:26,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [651019722] [2020-07-21 22:19:26,516 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:26,516 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:26,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [428747179] [2020-07-21 22:19:26,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:26,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:26,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:26,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:26,518 INFO L87 Difference]: Start difference. First operand 52 states and 80 transitions. Second operand 11 states. [2020-07-21 22:19:26,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:26,656 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2020-07-21 22:19:26,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:26,660 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 109 [2020-07-21 22:19:26,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:26,662 INFO L225 Difference]: With dead ends: 79 [2020-07-21 22:19:26,662 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 22:19:26,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 202 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:26,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 22:19:26,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 54. [2020-07-21 22:19:26,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 22:19:26,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 85 transitions. [2020-07-21 22:19:26,674 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 85 transitions. Word has length 109 [2020-07-21 22:19:26,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:26,675 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 85 transitions. [2020-07-21 22:19:26,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:26,675 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 85 transitions. [2020-07-21 22:19:26,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 22:19:26,677 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:26,677 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:26,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:26,888 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:26,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:26,889 INFO L82 PathProgramCache]: Analyzing trace with hash 836558126, now seen corresponding path program 1 times [2020-07-21 22:19:26,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:26,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115389062] [2020-07-21 22:19:26,890 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:26,948 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:26,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:26,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:19:26,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:27,016 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 105 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2020-07-21 22:19:27,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:27,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:27,964 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 113 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-21 22:19:27,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115389062] [2020-07-21 22:19:27,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:27,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 22:19:27,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690237496] [2020-07-21 22:19:27,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:19:27,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:27,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:19:27,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:19:27,966 INFO L87 Difference]: Start difference. First operand 54 states and 85 transitions. Second operand 15 states. [2020-07-21 22:19:28,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:28,227 INFO L93 Difference]: Finished difference Result 94 states and 199 transitions. [2020-07-21 22:19:28,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:19:28,228 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-21 22:19:28,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:28,230 INFO L225 Difference]: With dead ends: 94 [2020-07-21 22:19:28,230 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 22:19:28,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:19:28,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 22:19:28,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-21 22:19:28,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 22:19:28,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 95 transitions. [2020-07-21 22:19:28,256 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 95 transitions. Word has length 135 [2020-07-21 22:19:28,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:28,257 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 95 transitions. [2020-07-21 22:19:28,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:19:28,257 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 95 transitions. [2020-07-21 22:19:28,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 22:19:28,263 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:28,263 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:28,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:28,464 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:28,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:28,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1608635723, now seen corresponding path program 2 times [2020-07-21 22:19:28,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:28,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456258761] [2020-07-21 22:19:28,466 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:28,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:19:28,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:28,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:28,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:28,589 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 78 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-21 22:19:28,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:29,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:29,212 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 82 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2020-07-21 22:19:29,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456258761] [2020-07-21 22:19:29,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:29,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:29,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279785964] [2020-07-21 22:19:29,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:29,213 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:29,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:29,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:29,214 INFO L87 Difference]: Start difference. First operand 62 states and 95 transitions. Second operand 13 states. [2020-07-21 22:19:29,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:29,389 INFO L93 Difference]: Finished difference Result 92 states and 161 transitions. [2020-07-21 22:19:29,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:29,389 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-21 22:19:29,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:29,392 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:19:29,392 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:19:29,393 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:29,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:19:29,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 65. [2020-07-21 22:19:29,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 22:19:29,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 103 transitions. [2020-07-21 22:19:29,402 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 103 transitions. Word has length 121 [2020-07-21 22:19:29,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:29,403 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 103 transitions. [2020-07-21 22:19:29,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:29,403 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 103 transitions. [2020-07-21 22:19:29,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-07-21 22:19:29,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:29,405 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:29,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:29,612 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:29,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:29,613 INFO L82 PathProgramCache]: Analyzing trace with hash -46122593, now seen corresponding path program 3 times [2020-07-21 22:19:29,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:29,614 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [991120094] [2020-07-21 22:19:29,614 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:29,688 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:29,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:29,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:29,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:29,739 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-21 22:19:29,739 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:29,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,129 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2020-07-21 22:19:30,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [991120094] [2020-07-21 22:19:30,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:30,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:30,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926459893] [2020-07-21 22:19:30,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:30,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:30,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:30,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:30,132 INFO L87 Difference]: Start difference. First operand 65 states and 103 transitions. Second operand 11 states. [2020-07-21 22:19:30,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:30,246 INFO L93 Difference]: Finished difference Result 84 states and 140 transitions. [2020-07-21 22:19:30,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:30,247 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 95 [2020-07-21 22:19:30,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:30,249 INFO L225 Difference]: With dead ends: 84 [2020-07-21 22:19:30,249 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 22:19:30,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:30,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 22:19:30,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-21 22:19:30,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 22:19:30,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 122 transitions. [2020-07-21 22:19:30,259 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 122 transitions. Word has length 95 [2020-07-21 22:19:30,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:30,260 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 122 transitions. [2020-07-21 22:19:30,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:30,260 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 122 transitions. [2020-07-21 22:19:30,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 22:19:30,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:30,262 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:30,475 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:30,475 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:30,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:30,476 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 4 times [2020-07-21 22:19:30,476 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:30,477 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762214077] [2020-07-21 22:19:30,477 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:30,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:19:30,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:30,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:19:30,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:30,623 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 83 proven. 24 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 22:19:30,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:30,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:30,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:31,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:31,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:31,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:31,226 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 85 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-21 22:19:31,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762214077] [2020-07-21 22:19:31,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:31,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 22:19:31,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801009510] [2020-07-21 22:19:31,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:19:31,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:31,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:19:31,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:19:31,229 INFO L87 Difference]: Start difference. First operand 72 states and 122 transitions. Second operand 13 states. [2020-07-21 22:19:31,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:31,404 INFO L93 Difference]: Finished difference Result 92 states and 158 transitions. [2020-07-21 22:19:31,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:19:31,405 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 107 [2020-07-21 22:19:31,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:31,407 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:19:31,407 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:19:31,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 193 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:19:31,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:19:31,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2020-07-21 22:19:31,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 22:19:31,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-21 22:19:31,417 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 107 [2020-07-21 22:19:31,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:31,417 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-21 22:19:31,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:19:31,417 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-21 22:19:31,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 22:19:31,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:31,419 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:31,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:31,626 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:31,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:31,627 INFO L82 PathProgramCache]: Analyzing trace with hash 235412830, now seen corresponding path program 5 times [2020-07-21 22:19:31,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:31,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217586545] [2020-07-21 22:19:31,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:31,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:31,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:19:31,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:19:31,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:31,756 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 19 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2020-07-21 22:19:31,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:19:31,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:32,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:32,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:32,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:19:32,132 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 20 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-21 22:19:32,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217586545] [2020-07-21 22:19:32,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:19:32,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 22:19:32,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378187696] [2020-07-21 22:19:32,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:19:32,137 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:19:32,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:19:32,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:19:32,137 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 11 states. [2020-07-21 22:19:32,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:19:32,262 INFO L93 Difference]: Finished difference Result 91 states and 155 transitions. [2020-07-21 22:19:32,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:19:32,262 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 108 [2020-07-21 22:19:32,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:19:32,267 INFO L225 Difference]: With dead ends: 91 [2020-07-21 22:19:32,268 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 22:19:32,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 199 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:19:32,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 22:19:32,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2020-07-21 22:19:32,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 22:19:32,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-21 22:19:32,282 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 108 [2020-07-21 22:19:32,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:19:32,283 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-21 22:19:32,283 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:19:32,283 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-21 22:19:32,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 22:19:32,285 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:19:32,285 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:19:32,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:32,499 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:19:32,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:19:32,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 6 times [2020-07-21 22:19:32,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:19:32,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639392450] [2020-07-21 22:19:32,500 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:32,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:19:32,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 22:19:32,587 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:19:32,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 22:19:32,624 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 22:19:32,678 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 22:19:32,678 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 22:19:32,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:19:32,938 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:19:32 BoogieIcfgContainer [2020-07-21 22:19:32,939 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:19:32,944 INFO L168 Benchmark]: Toolchain (without parser) took 16503.33 ms. Allocated memory was 141.0 MB in the beginning and 349.7 MB in the end (delta: 208.7 MB). Free memory was 103.6 MB in the beginning and 313.1 MB in the end (delta: -209.5 MB). Peak memory consumption was 222.3 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:32,945 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 141.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 22:19:32,945 INFO L168 Benchmark]: CACSL2BoogieTranslator took 229.35 ms. Allocated memory is still 141.0 MB. Free memory was 103.1 MB in the beginning and 93.5 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:32,946 INFO L168 Benchmark]: Boogie Preprocessor took 23.98 ms. Allocated memory is still 141.0 MB. Free memory was 93.5 MB in the beginning and 92.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:32,946 INFO L168 Benchmark]: RCFGBuilder took 383.89 ms. Allocated memory was 141.0 MB in the beginning and 201.9 MB in the end (delta: 60.8 MB). Free memory was 92.1 MB in the beginning and 167.8 MB in the end (delta: -75.7 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:32,947 INFO L168 Benchmark]: TraceAbstraction took 15859.60 ms. Allocated memory was 201.9 MB in the beginning and 349.7 MB in the end (delta: 147.8 MB). Free memory was 167.1 MB in the beginning and 313.1 MB in the end (delta: -145.9 MB). Peak memory consumption was 225.1 MB. Max. memory is 7.1 GB. [2020-07-21 22:19:32,950 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 141.0 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 229.35 ms. Allocated memory is still 141.0 MB. Free memory was 103.1 MB in the beginning and 93.5 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.98 ms. Allocated memory is still 141.0 MB. Free memory was 93.5 MB in the beginning and 92.1 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 383.89 ms. Allocated memory was 141.0 MB in the beginning and 201.9 MB in the end (delta: 60.8 MB). Free memory was 92.1 MB in the beginning and 167.8 MB in the end (delta: -75.7 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15859.60 ms. Allocated memory was 201.9 MB in the beginning and 349.7 MB in the end (delta: 147.8 MB). Free memory was 167.1 MB in the beginning and 313.1 MB in the end (delta: -145.9 MB). Peak memory consumption was 225.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 5; VAL [x=5] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L37] int result = fibo1(x); [L38] COND TRUE result == 5 VAL [result=5, x=5] [L39] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 15.7s, OverallIterations: 17, TraceHistogramMax: 11, AutomataDifference: 2.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 372 SDtfs, 564 SDslu, 1730 SDs, 0 SdLazy, 1676 SolverSat, 421 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2277 GetRequests, 1968 SyntacticMatches, 107 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=73occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 16 MinimizatonAttempts, 185 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 7.9s InterpolantComputationTime, 1235 NumberOfCodeBlocks, 815 NumberOfCodeBlocksAsserted, 42 NumberOfCheckSat, 2195 ConstructedInterpolants, 0 QuantifiedInterpolants, 368621 SizeOfPredicates, 67 NumberOfNonLiveVariables, 1587 ConjunctsInSsa, 134 ConjunctsInUnsatCore, 30 InterpolantComputations, 2 PerfectInterpolantSequences, 3469/4520 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...