/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options interpolation-heuristic=FIRST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-eb0fd7c [2020-09-21 11:19:22,568 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-21 11:19:22,572 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-21 11:19:22,599 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-21 11:19:22,600 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-21 11:19:22,601 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-21 11:19:22,603 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-21 11:19:22,605 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-21 11:19:22,607 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-21 11:19:22,608 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-21 11:19:22,610 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-21 11:19:22,611 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-21 11:19:22,611 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-21 11:19:22,613 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-21 11:19:22,614 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-21 11:19:22,616 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-21 11:19:22,617 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-21 11:19:22,618 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-21 11:19:22,620 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-21 11:19:22,622 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-21 11:19:22,624 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-21 11:19:22,625 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-21 11:19:22,626 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-21 11:19:22,627 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-21 11:19:22,630 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-21 11:19:22,630 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-21 11:19:22,631 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-21 11:19:22,632 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-21 11:19:22,632 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-21 11:19:22,634 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-21 11:19:22,634 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-21 11:19:22,635 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-21 11:19:22,636 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-21 11:19:22,637 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-21 11:19:22,638 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-21 11:19:22,638 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-21 11:19:22,639 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-21 11:19:22,640 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-21 11:19:22,640 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-21 11:19:22,641 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-21 11:19:22,642 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-21 11:19:22,643 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-21 11:19:22,671 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-21 11:19:22,672 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-21 11:19:22,673 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-21 11:19:22,673 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-21 11:19:22,674 INFO L138 SettingsManager]: * Use SBE=true [2020-09-21 11:19:22,674 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-21 11:19:22,674 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-21 11:19:22,674 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-21 11:19:22,675 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-21 11:19:22,675 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-21 11:19:22,675 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-21 11:19:22,675 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-21 11:19:22,675 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-21 11:19:22,676 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-21 11:19:22,676 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-21 11:19:22,676 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-21 11:19:22,676 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-21 11:19:22,677 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-21 11:19:22,677 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-21 11:19:22,677 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-21 11:19:22,677 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-21 11:19:22,678 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-21 11:19:22,678 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-21 11:19:22,678 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-21 11:19:22,678 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-21 11:19:22,679 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-21 11:19:22,679 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-21 11:19:22,679 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-21 11:19:22,679 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-21 11:19:22,679 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;interpolation-heuristic=FIRST;log-additional-information=true; [2020-09-21 11:19:23,200 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-21 11:19:23,219 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-21 11:19:23,224 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-21 11:19:23,226 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-21 11:19:23,227 INFO L275 PluginConnector]: CDTParser initialized [2020-09-21 11:19:23,228 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-09-21 11:19:23,327 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/afa918924/ab0631a787364aa3aba829f6c26dbbc2/FLAGe76fc4335 [2020-09-21 11:19:23,909 INFO L306 CDTParser]: Found 1 translation units. [2020-09-21 11:19:23,910 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann02.c [2020-09-21 11:19:23,920 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/afa918924/ab0631a787364aa3aba829f6c26dbbc2/FLAGe76fc4335 [2020-09-21 11:19:24,236 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/afa918924/ab0631a787364aa3aba829f6c26dbbc2 [2020-09-21 11:19:24,252 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-21 11:19:24,258 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-21 11:19:24,260 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-21 11:19:24,260 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-21 11:19:24,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-21 11:19:24,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,270 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6d72532b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24, skipping insertion in model container [2020-09-21 11:19:24,271 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,280 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-21 11:19:24,308 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-21 11:19:24,560 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:19:24,566 INFO L203 MainTranslator]: Completed pre-run [2020-09-21 11:19:24,588 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-21 11:19:24,604 INFO L208 MainTranslator]: Completed translation [2020-09-21 11:19:24,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24 WrapperNode [2020-09-21 11:19:24,605 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-21 11:19:24,606 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-21 11:19:24,606 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-21 11:19:24,606 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-21 11:19:24,620 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,621 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,705 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,706 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,710 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,713 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,715 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... [2020-09-21 11:19:24,717 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-21 11:19:24,717 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-21 11:19:24,717 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-21 11:19:24,717 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-21 11:19:24,719 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-21 11:19:24,791 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-21 11:19:24,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-21 11:19:24,792 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-09-21 11:19:24,792 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-21 11:19:24,792 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-21 11:19:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-21 11:19:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-09-21 11:19:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-21 11:19:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-21 11:19:24,793 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-21 11:19:25,031 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-21 11:19:25,032 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-21 11:19:25,037 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:19:25 BoogieIcfgContainer [2020-09-21 11:19:25,038 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-21 11:19:25,039 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-21 11:19:25,039 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-21 11:19:25,043 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-21 11:19:25,044 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.09 11:19:24" (1/3) ... [2020-09-21 11:19:25,045 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22afe02d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:19:25, skipping insertion in model container [2020-09-21 11:19:25,045 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.09 11:19:24" (2/3) ... [2020-09-21 11:19:25,046 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@22afe02d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.09 11:19:25, skipping insertion in model container [2020-09-21 11:19:25,046 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.09 11:19:25" (3/3) ... [2020-09-21 11:19:25,048 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-09-21 11:19:25,062 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-21 11:19:25,077 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-21 11:19:25,142 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-21 11:19:25,203 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-21 11:19:25,203 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-21 11:19:25,204 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-21 11:19:25,204 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-21 11:19:25,204 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-21 11:19:25,204 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-21 11:19:25,204 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-21 11:19:25,205 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-21 11:19:25,227 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-09-21 11:19:25,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-09-21 11:19:25,235 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:19:25,236 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:19:25,237 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:19:25,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:19:25,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-09-21 11:19:25,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:19:25,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998683872] [2020-09-21 11:19:25,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:19:25,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:25,419 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:25,420 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:25,420 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:25,420 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:25,421 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-09-21 11:19:25,421 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:25,421 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 37 [2020-09-21 11:19:25,421 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:25,421 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:19:25,422 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-09-21 11:19:25,422 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-09-21 11:19:25,422 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:19:25,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:19:25,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:25,487 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:25,487 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:25,488 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:25,488 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:25,488 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:19:25,488 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:25,489 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:19:25,489 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:25,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:19:25,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:25,490 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:19:25,490 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:19:25,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 11:19:25,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:25,517 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:25,517 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:25,517 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:25,518 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:25,518 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:19:25,518 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:25,519 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 16 [2020-09-21 11:19:25,519 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:25,519 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-21 11:19:25,519 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:25,520 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:19:25,520 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:25,588 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-21 11:19:25,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998683872] [2020-09-21 11:19:25,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-21 11:19:25,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-21 11:19:25,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474476097] [2020-09-21 11:19:25,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-21 11:19:25,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:19:25,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-21 11:19:25,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:19:25,621 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-09-21 11:19:25,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:19:25,795 INFO L93 Difference]: Finished difference Result 55 states and 77 transitions. [2020-09-21 11:19:25,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-21 11:19:25,798 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-09-21 11:19:25,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:19:25,813 INFO L225 Difference]: With dead ends: 55 [2020-09-21 11:19:25,813 INFO L226 Difference]: Without dead ends: 28 [2020-09-21 11:19:25,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-21 11:19:25,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-09-21 11:19:25,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-09-21 11:19:25,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-09-21 11:19:25,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 35 transitions. [2020-09-21 11:19:25,883 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 35 transitions. Word has length 15 [2020-09-21 11:19:25,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:19:25,884 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 35 transitions. [2020-09-21 11:19:25,884 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-21 11:19:25,885 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 35 transitions. [2020-09-21 11:19:25,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-09-21 11:19:25,888 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:19:25,888 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] [2020-09-21 11:19:25,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-21 11:19:25,889 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:19:25,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:19:25,889 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-09-21 11:19:25,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:19:25,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2044176645] [2020-09-21 11:19:25,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:19:25,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:25,967 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:25,968 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:25,968 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:25,969 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:25,974 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-09-21 11:19:25,974 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:25,975 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 52 [2020-09-21 11:19:25,975 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:25,975 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 11:19:25,976 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-09-21 11:19:25,976 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 17 [2020-09-21 11:19:25,976 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:19:26,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,028 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,028 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,028 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,029 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,029 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:19:26,029 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,030 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:19:26,030 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,030 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:19:26,031 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:26,031 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:19:26,031 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 11:19:26,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,071 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,072 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,072 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,072 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,072 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-09-21 11:19:26,073 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,073 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 26 [2020-09-21 11:19:26,073 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,073 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-21 11:19:26,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:26,074 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 16 [2020-09-21 11:19:26,074 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:19:26,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 11:19:26,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,123 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,123 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,123 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,124 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,124 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:19:26,124 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,124 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 15 [2020-09-21 11:19:26,125 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,125 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-21 11:19:26,125 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:26,125 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-09-21 11:19:26,126 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-21 11:19:26,168 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-21 11:19:26,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2044176645] [2020-09-21 11:19:26,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:19:26,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-21 11:19:26,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054740541] [2020-09-21 11:19:26,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-21 11:19:26,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:19:26,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-21 11:19:26,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-21 11:19:26,173 INFO L87 Difference]: Start difference. First operand 28 states and 35 transitions. Second operand 7 states. [2020-09-21 11:19:26,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:19:26,342 INFO L93 Difference]: Finished difference Result 49 states and 67 transitions. [2020-09-21 11:19:26,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-21 11:19:26,343 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-09-21 11:19:26,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:19:26,346 INFO L225 Difference]: With dead ends: 49 [2020-09-21 11:19:26,346 INFO L226 Difference]: Without dead ends: 45 [2020-09-21 11:19:26,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-09-21 11:19:26,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-21 11:19:26,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-09-21 11:19:26,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-21 11:19:26,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 63 transitions. [2020-09-21 11:19:26,365 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 63 transitions. Word has length 22 [2020-09-21 11:19:26,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:19:26,366 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 63 transitions. [2020-09-21 11:19:26,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-21 11:19:26,366 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 63 transitions. [2020-09-21 11:19:26,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-09-21 11:19:26,369 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:19:26,369 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:19:26,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-21 11:19:26,370 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:19:26,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:19:26,370 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-09-21 11:19:26,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:19:26,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304308464] [2020-09-21 11:19:26,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:19:26,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,391 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,392 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,392 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,392 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,393 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 42 [2020-09-21 11:19:26,393 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,393 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-21 11:19:26,394 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 11:19:26,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 21 [2020-09-21 11:19:26,394 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-09-21 11:19:26,395 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-21 11:19:26,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,412 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,412 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,413 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,413 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-21 11:19:26,413 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:19:26,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-21 11:19:26,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:26,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-21 11:19:26,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-09-21 11:19:26,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,447 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,447 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,448 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,448 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,448 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-09-21 11:19:26,448 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,449 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-09-21 11:19:26,449 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 11:19:26,449 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 7 [2020-09-21 11:19:26,450 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-09-21 11:19:26,450 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 11:19:26,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,470 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,470 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,470 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,471 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,471 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-09-21 11:19:26,471 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,472 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-21 11:19:26,472 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,472 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-21 11:19:26,473 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-09-21 11:19:26,473 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 15 [2020-09-21 11:19:26,473 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-09-21 11:19:26,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-21 11:19:26,502 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-21 11:19:26,502 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-21 11:19:26,503 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-21 11:19:26,503 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-21 11:19:26,503 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-21 11:19:26,504 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-21 11:19:26,504 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-21 11:19:26,504 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-21 11:19:26,504 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-21 11:19:26,505 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-21 11:19:26,505 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-21 11:19:26,505 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-21 11:19:26,512 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-09-21 11:19:26,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304308464] [2020-09-21 11:19:26,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-21 11:19:26,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-21 11:19:26,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097188894] [2020-09-21 11:19:26,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-21 11:19:26,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-21 11:19:26,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-21 11:19:26,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-21 11:19:26,516 INFO L87 Difference]: Start difference. First operand 45 states and 63 transitions. Second operand 4 states. [2020-09-21 11:19:26,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-21 11:19:26,578 INFO L93 Difference]: Finished difference Result 88 states and 151 transitions. [2020-09-21 11:19:26,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-21 11:19:26,578 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2020-09-21 11:19:26,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-21 11:19:26,581 INFO L225 Difference]: With dead ends: 88 [2020-09-21 11:19:26,582 INFO L226 Difference]: Without dead ends: 51 [2020-09-21 11:19:26,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-21 11:19:26,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-09-21 11:19:26,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-09-21 11:19:26,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-09-21 11:19:26,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 75 transitions. [2020-09-21 11:19:26,602 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 75 transitions. Word has length 29 [2020-09-21 11:19:26,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-21 11:19:26,602 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 75 transitions. [2020-09-21 11:19:26,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-21 11:19:26,602 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 75 transitions. [2020-09-21 11:19:26,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-09-21 11:19:26,605 INFO L414 BasicCegarLoop]: Found error trace [2020-09-21 11:19:26,605 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-21 11:19:26,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-21 11:19:26,606 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-21 11:19:26,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-21 11:19:26,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-09-21 11:19:26,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-21 11:19:26,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611923829] [2020-09-21 11:19:26,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-21 11:19:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-21 11:19:26,638 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-21 11:19:26,639 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-21 11:19:26,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-21 11:19:26,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.09 11:19:26 BoogieIcfgContainer [2020-09-21 11:19:26,670 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-21 11:19:26,674 INFO L168 Benchmark]: Toolchain (without parser) took 2418.85 ms. Allocated memory was 137.4 MB in the beginning and 229.6 MB in the end (delta: 92.3 MB). Free memory was 100.9 MB in the beginning and 176.2 MB in the end (delta: -75.4 MB). Peak memory consumption was 16.9 MB. Max. memory is 7.1 GB. [2020-09-21 11:19:26,675 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-21 11:19:26,676 INFO L168 Benchmark]: CACSL2BoogieTranslator took 345.63 ms. Allocated memory is still 137.4 MB. Free memory was 100.5 MB in the beginning and 90.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-09-21 11:19:26,677 INFO L168 Benchmark]: Boogie Preprocessor took 111.16 ms. Allocated memory was 137.4 MB in the beginning and 200.3 MB in the end (delta: 62.9 MB). Free memory was 90.9 MB in the beginning and 179.0 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-09-21 11:19:26,678 INFO L168 Benchmark]: RCFGBuilder took 320.81 ms. Allocated memory is still 200.3 MB. Free memory was 179.0 MB in the beginning and 165.9 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-09-21 11:19:26,679 INFO L168 Benchmark]: TraceAbstraction took 1631.24 ms. Allocated memory was 200.3 MB in the beginning and 229.6 MB in the end (delta: 29.4 MB). Free memory was 165.2 MB in the beginning and 176.2 MB in the end (delta: -11.1 MB). Peak memory consumption was 18.3 MB. Max. memory is 7.1 GB. [2020-09-21 11:19:26,684 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 345.63 ms. Allocated memory is still 137.4 MB. Free memory was 100.5 MB in the beginning and 90.9 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 111.16 ms. Allocated memory was 137.4 MB in the beginning and 200.3 MB in the end (delta: 62.9 MB). Free memory was 90.9 MB in the beginning and 179.0 MB in the end (delta: -88.1 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 320.81 ms. Allocated memory is still 200.3 MB. Free memory was 179.0 MB in the beginning and 165.9 MB in the end (delta: 13.1 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1631.24 ms. Allocated memory was 200.3 MB in the beginning and 229.6 MB in the end (delta: 29.4 MB). Free memory was 165.2 MB in the beginning and 176.2 MB in the end (delta: -11.1 MB). Peak memory consumption was 18.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int m = __VERIFIER_nondet_int(); [L27] COND FALSE !(m < 0 || m > 3) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 23) [L39] CALL, EXPR ackermann(m,n) [L15] COND FALSE !(m==0) [L18] COND TRUE n==0 [L19] CALL, EXPR ackermann(m-1,1) [L15] COND FALSE !(m==0) [L18] COND FALSE !(n==0) [L21] CALL, EXPR ackermann(m,n-1) [L15] COND FALSE !(m==0) [L18] COND TRUE n==0 [L19] CALL, EXPR ackermann(m-1,1) [L15] COND TRUE m==0 [L16] return n+1; [L19] RET, EXPR ackermann(m-1,1) [L19] return ackermann(m-1,1); [L21] RET, EXPR ackermann(m,n-1) [L21] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) [L15] COND TRUE m==0 [L16] return n+1; [L21] RET, EXPR ackermann(m-1,ackermann(m,n-1)) [L21] return ackermann(m-1,ackermann(m,n-1)); [L19] RET, EXPR ackermann(m-1,1) [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) [L43] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 77 SDtfs, 49 SDslu, 144 SDs, 0 SdLazy, 129 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 108 NumberOfCodeBlocks, 108 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 63 ConstructedInterpolants, 0 QuantifiedInterpolants, 2527 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 15/19 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...