/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 --rcfgbuilder.size.of.a.code.block SingleStatement --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-c90d42b [2020-09-24 15:56:37,132 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-24 15:56:37,135 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-24 15:56:37,161 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-24 15:56:37,162 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-24 15:56:37,163 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-24 15:56:37,164 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-24 15:56:37,166 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-24 15:56:37,168 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-24 15:56:37,169 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-24 15:56:37,170 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-24 15:56:37,172 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-24 15:56:37,172 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-24 15:56:37,173 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-24 15:56:37,175 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-24 15:56:37,176 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-24 15:56:37,177 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-24 15:56:37,178 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-24 15:56:37,180 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-24 15:56:37,183 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-24 15:56:37,184 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-24 15:56:37,186 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-24 15:56:37,187 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-24 15:56:37,188 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-24 15:56:37,191 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-24 15:56:37,191 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-24 15:56:37,191 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-24 15:56:37,193 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-24 15:56:37,193 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-24 15:56:37,194 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-24 15:56:37,195 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-24 15:56:37,196 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-24 15:56:37,196 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-24 15:56:37,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-24 15:56:37,199 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-24 15:56:37,199 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-24 15:56:37,200 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-24 15:56:37,200 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-24 15:56:37,200 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-24 15:56:37,201 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-24 15:56:37,202 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-24 15:56:37,203 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 [2020-09-24 15:56:37,249 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-24 15:56:37,250 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-24 15:56:37,252 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-24 15:56:37,252 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-24 15:56:37,252 INFO L138 SettingsManager]: * Use SBE=true [2020-09-24 15:56:37,253 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-24 15:56:37,253 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-24 15:56:37,253 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-24 15:56:37,254 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-24 15:56:37,254 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-24 15:56:37,255 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-24 15:56:37,255 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-24 15:56:37,255 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-24 15:56:37,256 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-24 15:56:37,256 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-24 15:56:37,256 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-24 15:56:37,256 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-24 15:56:37,257 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-24 15:56:37,257 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-24 15:56:37,257 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-24 15:56:37,258 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-24 15:56:37,258 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-24 15:56:37,258 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-24 15:56:37,259 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-24 15:56:37,259 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-24 15:56:37,259 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-24 15:56:37,259 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-24 15:56:37,259 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-24 15:56:37,260 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-24 15:56:37,260 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.rcfgbuilder: Size of a code block -> SingleStatement 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; [2020-09-24 15:56:37,744 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-24 15:56:37,763 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-24 15:56:37,767 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-24 15:56:37,769 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-24 15:56:37,770 INFO L275 PluginConnector]: CDTParser initialized [2020-09-24 15:56:37,771 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-09-24 15:56:37,870 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/35a747310/90acf767f96848d5b3bf1503641dfad7/FLAG75e02f00e [2020-09-24 15:56:38,435 INFO L306 CDTParser]: Found 1 translation units. [2020-09-24 15:56:38,435 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Ackermann02.c [2020-09-24 15:56:38,443 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/35a747310/90acf767f96848d5b3bf1503641dfad7/FLAG75e02f00e [2020-09-24 15:56:38,774 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/35a747310/90acf767f96848d5b3bf1503641dfad7 [2020-09-24 15:56:38,790 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-24 15:56:38,797 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-24 15:56:38,798 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-24 15:56:38,798 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-24 15:56:38,802 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-24 15:56:38,804 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:56:38" (1/1) ... [2020-09-24 15:56:38,809 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@245d8fce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:38, skipping insertion in model container [2020-09-24 15:56:38,809 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.09 03:56:38" (1/1) ... [2020-09-24 15:56:38,818 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-24 15:56:38,844 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-24 15:56:39,063 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 15:56:39,068 INFO L203 MainTranslator]: Completed pre-run [2020-09-24 15:56:39,089 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-24 15:56:39,104 INFO L208 MainTranslator]: Completed translation [2020-09-24 15:56:39,105 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39 WrapperNode [2020-09-24 15:56:39,105 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-24 15:56:39,106 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-24 15:56:39,106 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-24 15:56:39,106 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-24 15:56:39,120 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,120 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,126 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,126 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,130 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,133 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,134 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (1/1) ... [2020-09-24 15:56:39,136 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-24 15:56:39,137 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-24 15:56:39,137 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-24 15:56:39,137 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-24 15:56:39,139 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (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 [2020-09-24 15:56:39,309 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-24 15:56:39,310 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-24 15:56:39,310 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-09-24 15:56:39,310 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-24 15:56:39,310 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-24 15:56:39,311 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-24 15:56:39,311 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-09-24 15:56:39,311 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-24 15:56:39,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-24 15:56:39,311 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-24 15:56:39,563 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-24 15:56:39,564 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-24 15:56:39,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:56:39 BoogieIcfgContainer [2020-09-24 15:56:39,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-24 15:56:39,571 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-24 15:56:39,571 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-24 15:56:39,574 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-24 15:56:39,575 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.09 03:56:38" (1/3) ... [2020-09-24 15:56:39,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a51b8c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:56:39, skipping insertion in model container [2020-09-24 15:56:39,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.09 03:56:39" (2/3) ... [2020-09-24 15:56:39,577 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a51b8c0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.09 03:56:39, skipping insertion in model container [2020-09-24 15:56:39,577 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.09 03:56:39" (3/3) ... [2020-09-24 15:56:39,580 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-09-24 15:56:39,593 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-24 15:56:39,608 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-24 15:56:39,655 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-24 15:56:39,694 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-24 15:56:39,694 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-24 15:56:39,695 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-24 15:56:39,695 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-24 15:56:39,695 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-24 15:56:39,695 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-24 15:56:39,696 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-24 15:56:39,696 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-24 15:56:39,724 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2020-09-24 15:56:39,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-09-24 15:56:39,736 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:56:39,738 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:56:39,739 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:56:39,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:56:39,747 INFO L82 PathProgramCache]: Analyzing trace with hash -852610024, now seen corresponding path program 1 times [2020-09-24 15:56:39,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:56:39,762 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2021028127] [2020-09-24 15:56:39,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:56:39,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:39,939 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:39,940 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:39,940 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:39,941 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:39,941 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 33 [2020-09-24 15:56:39,941 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:39,941 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 36 [2020-09-24 15:56:39,942 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:39,942 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-24 15:56:39,942 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-09-24 15:56:39,942 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 12 [2020-09-24 15:56:39,943 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 15:56:40,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:56:40,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:40,012 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:40,012 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:40,012 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:40,012 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:40,013 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 15:56:40,013 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:40,013 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-09-24 15:56:40,014 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:40,014 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 15:56:40,014 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:40,014 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 15:56:40,015 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:40,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-09-24 15:56:40,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:40,070 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:40,074 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:40,074 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:40,074 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:40,075 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 12 [2020-09-24 15:56:40,075 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:40,075 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 37 [2020-09-24 15:56:40,075 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:40,076 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-09-24 15:56:40,076 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:40,076 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-09-24 15:56:40,076 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:40,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-24 15:56:40,157 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2021028127] [2020-09-24 15:56:40,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-24 15:56:40,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-24 15:56:40,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586848167] [2020-09-24 15:56:40,168 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-24 15:56:40,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:56:40,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-24 15:56:40,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-24 15:56:40,187 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 5 states. [2020-09-24 15:56:40,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:56:40,373 INFO L93 Difference]: Finished difference Result 88 states and 110 transitions. [2020-09-24 15:56:40,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-24 15:56:40,376 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-09-24 15:56:40,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:56:40,392 INFO L225 Difference]: With dead ends: 88 [2020-09-24 15:56:40,392 INFO L226 Difference]: Without dead ends: 45 [2020-09-24 15:56:40,398 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 [2020-09-24 15:56:40,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-24 15:56:40,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-09-24 15:56:40,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-24 15:56:40,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 52 transitions. [2020-09-24 15:56:40,466 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 52 transitions. Word has length 24 [2020-09-24 15:56:40,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:56:40,467 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 52 transitions. [2020-09-24 15:56:40,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-24 15:56:40,467 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 52 transitions. [2020-09-24 15:56:40,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-09-24 15:56:40,471 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:56:40,471 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:56:40,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-24 15:56:40,472 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:56:40,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:56:40,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1574290279, now seen corresponding path program 1 times [2020-09-24 15:56:40,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:56:40,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1784550304] [2020-09-24 15:56:40,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:56:40,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:40,531 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:40,531 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:40,532 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:40,532 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:40,532 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 45 [2020-09-24 15:56:40,533 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:40,533 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 21 [2020-09-24 15:56:40,533 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:40,533 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-24 15:56:40,534 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-09-24 15:56:40,534 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 24 [2020-09-24 15:56:40,534 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:40,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:56:40,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:40,565 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:40,565 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:40,565 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:40,566 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:40,566 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 15:56:40,566 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:40,566 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-24 15:56:40,567 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:40,567 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 15:56:40,567 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:40,567 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 15:56:40,568 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-24 15:56:40,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-09-24 15:56:40,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:40,594 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:40,594 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:40,595 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:40,595 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:40,595 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-09-24 15:56:40,595 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:40,596 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 14 [2020-09-24 15:56:40,596 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:40,596 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-24 15:56:40,596 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:40,596 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 21 [2020-09-24 15:56:40,597 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:40,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-09-24 15:56:40,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:40,643 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:40,643 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:40,647 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:40,647 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:40,647 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 12 [2020-09-24 15:56:40,648 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:40,648 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 13 [2020-09-24 15:56:40,648 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:40,648 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-09-24 15:56:40,648 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:40,649 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-09-24 15:56:40,649 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:40,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-24 15:56:40,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1784550304] [2020-09-24 15:56:40,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:56:40,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-09-24 15:56:40,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114481577] [2020-09-24 15:56:40,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-09-24 15:56:40,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:56:40,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-09-24 15:56:40,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-09-24 15:56:40,712 INFO L87 Difference]: Start difference. First operand 45 states and 52 transitions. Second operand 7 states. [2020-09-24 15:56:40,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:56:40,934 INFO L93 Difference]: Finished difference Result 79 states and 97 transitions. [2020-09-24 15:56:40,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-24 15:56:40,935 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 34 [2020-09-24 15:56:40,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:56:40,940 INFO L225 Difference]: With dead ends: 79 [2020-09-24 15:56:40,940 INFO L226 Difference]: Without dead ends: 73 [2020-09-24 15:56:40,942 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 [2020-09-24 15:56:40,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-09-24 15:56:40,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-09-24 15:56:40,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-09-24 15:56:40,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 91 transitions. [2020-09-24 15:56:40,963 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 91 transitions. Word has length 34 [2020-09-24 15:56:40,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:56:40,963 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 91 transitions. [2020-09-24 15:56:40,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-09-24 15:56:40,964 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 91 transitions. [2020-09-24 15:56:40,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-09-24 15:56:40,967 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:56:40,967 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1, 1] [2020-09-24 15:56:40,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-24 15:56:40,967 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:56:40,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:56:40,968 INFO L82 PathProgramCache]: Analyzing trace with hash -1453709960, now seen corresponding path program 2 times [2020-09-24 15:56:40,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:56:40,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453565042] [2020-09-24 15:56:40,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:56:40,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:41,001 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:41,001 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:41,002 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:41,002 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:41,002 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 57 [2020-09-24 15:56:41,002 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:41,003 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-24 15:56:41,003 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:41,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-24 15:56:41,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 27 [2020-09-24 15:56:41,003 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 15:56:41,004 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:41,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-24 15:56:41,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:41,018 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:41,019 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:41,019 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:41,019 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:41,019 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-09-24 15:56:41,020 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:41,020 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-09-24 15:56:41,020 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:41,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-24 15:56:41,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:41,021 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-24 15:56:41,021 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:41,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2020-09-24 15:56:41,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:41,036 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:41,036 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:41,036 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:41,036 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:41,037 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-09-24 15:56:41,037 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:41,037 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-24 15:56:41,037 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:41,037 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-24 15:56:41,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 8 [2020-09-24 15:56:41,038 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-24 15:56:41,038 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:41,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-09-24 15:56:41,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:41,057 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:41,058 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:41,058 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:41,058 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:41,059 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 24 [2020-09-24 15:56:41,059 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:41,059 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-09-24 15:56:41,059 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:41,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-24 15:56:41,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 4 [2020-09-24 15:56:41,060 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 19 [2020-09-24 15:56:41,060 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:41,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2020-09-24 15:56:41,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-24 15:56:41,122 FATAL L256 erpolLogProxyWrapper]: Difference in size: 0 [2020-09-24 15:56:41,122 FATAL L256 erpolLogProxyWrapper]: Difference in depth: 0 [2020-09-24 15:56:41,123 FATAL L256 erpolLogProxyWrapper]: Difference in width: 0 [2020-09-24 15:56:41,123 FATAL L256 erpolLogProxyWrapper]: Timeout: Unlimited (no timeout set) [2020-09-24 15:56:41,123 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 12 [2020-09-24 15:56:41,123 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-24 15:56:41,124 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-09-24 15:56:41,124 FATAL L256 erpolLogProxyWrapper]: Heuristic: FIRST [2020-09-24 15:56:41,124 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-24 15:56:41,124 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-24 15:56:41,124 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-09-24 15:56:41,125 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-09-24 15:56:41,134 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-24 15:56:41,135 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453565042] [2020-09-24 15:56:41,135 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-24 15:56:41,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-09-24 15:56:41,136 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48118692] [2020-09-24 15:56:41,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-09-24 15:56:41,136 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-24 15:56:41,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-09-24 15:56:41,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-09-24 15:56:41,137 INFO L87 Difference]: Start difference. First operand 73 states and 91 transitions. Second operand 4 states. [2020-09-24 15:56:41,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-24 15:56:41,198 INFO L93 Difference]: Finished difference Result 139 states and 202 transitions. [2020-09-24 15:56:41,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-09-24 15:56:41,198 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 44 [2020-09-24 15:56:41,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-24 15:56:41,201 INFO L225 Difference]: With dead ends: 139 [2020-09-24 15:56:41,201 INFO L226 Difference]: Without dead ends: 79 [2020-09-24 15:56:41,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-09-24 15:56:41,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-09-24 15:56:41,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-09-24 15:56:41,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-09-24 15:56:41,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 103 transitions. [2020-09-24 15:56:41,223 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 103 transitions. Word has length 44 [2020-09-24 15:56:41,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-24 15:56:41,224 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 103 transitions. [2020-09-24 15:56:41,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-09-24 15:56:41,224 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 103 transitions. [2020-09-24 15:56:41,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-09-24 15:56:41,228 INFO L414 BasicCegarLoop]: Found error trace [2020-09-24 15:56:41,229 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-24 15:56:41,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-24 15:56:41,229 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-24 15:56:41,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-24 15:56:41,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1096450289, now seen corresponding path program 1 times [2020-09-24 15:56:41,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-24 15:56:41,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2032536466] [2020-09-24 15:56:41,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-24 15:56:41,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-24 15:56:41,260 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-24 15:56:41,260 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-24 15:56:41,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-24 15:56:41,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 24.09 03:56:41 BoogieIcfgContainer [2020-09-24 15:56:41,296 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-24 15:56:41,300 INFO L168 Benchmark]: Toolchain (without parser) took 2506.22 ms. Allocated memory was 146.3 MB in the beginning and 235.4 MB in the end (delta: 89.1 MB). Free memory was 101.4 MB in the beginning and 174.0 MB in the end (delta: -72.6 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. [2020-09-24 15:56:41,301 INFO L168 Benchmark]: CDTParser took 0.33 ms. Allocated memory is still 146.3 MB. Free memory was 119.7 MB in the beginning and 119.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-09-24 15:56:41,302 INFO L168 Benchmark]: CACSL2BoogieTranslator took 307.56 ms. Allocated memory is still 146.3 MB. Free memory was 100.8 MB in the beginning and 91.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-09-24 15:56:41,304 INFO L168 Benchmark]: Boogie Preprocessor took 30.74 ms. Allocated memory is still 146.3 MB. Free memory was 91.3 MB in the beginning and 89.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 7.1 GB. [2020-09-24 15:56:41,305 INFO L168 Benchmark]: RCFGBuilder took 432.49 ms. Allocated memory was 146.3 MB in the beginning and 202.4 MB in the end (delta: 56.1 MB). Free memory was 89.8 MB in the beginning and 167.9 MB in the end (delta: -78.1 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-09-24 15:56:41,307 INFO L168 Benchmark]: TraceAbstraction took 1725.53 ms. Allocated memory was 202.4 MB in the beginning and 235.4 MB in the end (delta: 33.0 MB). Free memory was 167.2 MB in the beginning and 174.0 MB in the end (delta: -6.8 MB). Peak memory consumption was 26.2 MB. Max. memory is 7.1 GB. [2020-09-24 15:56:41,311 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.33 ms. Allocated memory is still 146.3 MB. Free memory was 119.7 MB in the beginning and 119.4 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 307.56 ms. Allocated memory is still 146.3 MB. Free memory was 100.8 MB in the beginning and 91.3 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.74 ms. Allocated memory is still 146.3 MB. Free memory was 91.3 MB in the beginning and 89.8 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 432.49 ms. Allocated memory was 146.3 MB in the beginning and 202.4 MB in the end (delta: 56.1 MB). Free memory was 89.8 MB in the beginning and 167.9 MB in the end (delta: -78.1 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1725.53 ms. Allocated memory was 202.4 MB in the beginning and 235.4 MB in the end (delta: 33.0 MB). Free memory was 167.2 MB in the beginning and 174.0 MB in the end (delta: -6.8 MB). Peak memory consumption was 26.2 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, 44 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.5s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 131 SDtfs, 87 SDslu, 262 SDs, 0 SdLazy, 129 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 37 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=79occurred 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, 165 NumberOfCodeBlocks, 165 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 99 ConstructedInterpolants, 0 QuantifiedInterpolants, 6217 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 20/25 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...