/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 SequenceOfStatements --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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-13 13:01:37,520 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-13 13:01:37,524 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-13 13:01:37,566 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-13 13:01:37,566 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-13 13:01:37,575 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-13 13:01:37,576 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-13 13:01:37,580 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-13 13:01:37,582 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-13 13:01:37,585 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-13 13:01:37,586 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-13 13:01:37,587 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-13 13:01:37,587 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-13 13:01:37,590 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-13 13:01:37,592 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-13 13:01:37,594 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-13 13:01:37,596 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-13 13:01:37,597 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-13 13:01:37,598 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-13 13:01:37,606 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-13 13:01:37,608 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-13 13:01:37,609 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-13 13:01:37,610 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-13 13:01:37,610 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-13 13:01:37,623 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-13 13:01:37,629 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-13 13:01:37,629 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-13 13:01:37,630 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-13 13:01:37,631 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-13 13:01:37,632 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-13 13:01:37,632 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-13 13:01:37,636 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-13 13:01:37,636 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-13 13:01:37,637 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-13 13:01:37,638 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-13 13:01:37,638 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-13 13:01:37,639 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-13 13:01:37,639 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-13 13:01:37,639 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-13 13:01:37,641 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-13 13:01:37,643 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-13 13:01:37,643 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 [2020-10-13 13:01:37,681 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-13 13:01:37,682 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-13 13:01:37,684 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-13 13:01:37,684 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-13 13:01:37,684 INFO L138 SettingsManager]: * Use SBE=true [2020-10-13 13:01:37,684 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-13 13:01:37,685 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-13 13:01:37,685 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-13 13:01:37,685 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-13 13:01:37,685 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-13 13:01:37,686 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-13 13:01:37,687 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-13 13:01:37,687 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-13 13:01:37,687 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-13 13:01:37,687 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-13 13:01:37,688 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-13 13:01:37,688 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-13 13:01:37,688 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-13 13:01:37,688 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-13 13:01:37,688 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-13 13:01:37,689 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-13 13:01:37,689 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-13 13:01:37,689 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-13 13:01:37,689 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-13 13:01:37,689 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-13 13:01:37,690 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-13 13:01:37,690 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-13 13:01:37,690 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-13 13:01:37,690 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-13 13:01:37,690 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 -> SequenceOfStatements 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;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true;unknown-allowed=true; [2020-10-13 13:01:38,022 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-13 13:01:38,035 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-13 13:01:38,039 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-13 13:01:38,040 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-13 13:01:38,041 INFO L275 PluginConnector]: CDTParser initialized [2020-10-13 13:01:38,041 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-10-13 13:01:38,121 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a7d9d81a9/11abe9a7511f4ff18eb527cfc8163c68/FLAGc51245fc8 [2020-10-13 13:01:38,587 INFO L306 CDTParser]: Found 1 translation units. [2020-10-13 13:01:38,587 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/fibo_2calls_2-1.c [2020-10-13 13:01:38,595 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a7d9d81a9/11abe9a7511f4ff18eb527cfc8163c68/FLAGc51245fc8 [2020-10-13 13:01:38,959 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a7d9d81a9/11abe9a7511f4ff18eb527cfc8163c68 [2020-10-13 13:01:38,969 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-13 13:01:38,971 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-13 13:01:38,974 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-13 13:01:38,974 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-13 13:01:38,978 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-13 13:01:38,979 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 01:01:38" (1/1) ... [2020-10-13 13:01:38,982 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22d0bdac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:38, skipping insertion in model container [2020-10-13 13:01:38,982 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 01:01:38" (1/1) ... [2020-10-13 13:01:38,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-13 13:01:39,010 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-13 13:01:39,176 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 13:01:39,180 INFO L203 MainTranslator]: Completed pre-run [2020-10-13 13:01:39,197 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-13 13:01:39,211 INFO L208 MainTranslator]: Completed translation [2020-10-13 13:01:39,211 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39 WrapperNode [2020-10-13 13:01:39,211 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-13 13:01:39,212 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-13 13:01:39,212 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-13 13:01:39,213 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-13 13:01:39,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,224 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,306 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,307 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,311 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,313 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (1/1) ... [2020-10-13 13:01:39,315 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-13 13:01:39,316 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-13 13:01:39,316 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-13 13:01:39,316 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-13 13:01:39,317 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (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 [2020-10-13 13:01:39,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-13 13:01:39,381 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-13 13:01:39,381 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-10-13 13:01:39,381 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-10-13 13:01:39,381 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-13 13:01:39,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-13 13:01:39,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-13 13:01:39,382 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-10-13 13:01:39,382 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-10-13 13:01:39,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-13 13:01:39,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-13 13:01:39,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-13 13:01:39,579 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-13 13:01:39,579 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-13 13:01:39,583 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 01:01:39 BoogieIcfgContainer [2020-10-13 13:01:39,583 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-13 13:01:39,585 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-13 13:01:39,585 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-13 13:01:39,588 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-13 13:01:39,588 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 01:01:38" (1/3) ... [2020-10-13 13:01:39,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e33f6f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 01:01:39, skipping insertion in model container [2020-10-13 13:01:39,589 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 01:01:39" (2/3) ... [2020-10-13 13:01:39,589 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e33f6f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 01:01:39, skipping insertion in model container [2020-10-13 13:01:39,590 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 01:01:39" (3/3) ... [2020-10-13 13:01:39,591 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_2-1.c [2020-10-13 13:01:39,602 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-13 13:01:39,610 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-13 13:01:39,623 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-13 13:01:39,647 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-13 13:01:39,647 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-13 13:01:39,647 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-13 13:01:39,647 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-13 13:01:39,647 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-13 13:01:39,647 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-13 13:01:39,647 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-13 13:01:39,648 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-13 13:01:39,663 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-10-13 13:01:39,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-10-13 13:01:39,668 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 13:01:39,669 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 13:01:39,669 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 13:01:39,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 13:01:39,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-10-13 13:01:39,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 13:01:39,683 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571827651] [2020-10-13 13:01:39,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 13:01:39,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:39,786 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:39,848 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:39,908 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:39,908 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 21 [2020-10-13 13:01:39,908 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-13 13:01:39,909 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 133 [2020-10-13 13:01:39,911 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:39,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 13:01:39,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 13:01:39,912 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 13:01:39,913 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-13 13:01:40,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 13:01:40,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:40,051 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,054 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:40,054 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 13:01:40,055 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:40,055 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-13 13:01:40,055 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:40,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 13:01:40,056 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 13:01:40,057 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 13:01:40,057 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:40,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-10-13 13:01:40,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:40,071 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,085 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:40,086 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-13 13:01:40,086 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:40,087 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 17 [2020-10-13 13:01:40,087 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:40,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-13 13:01:40,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 13:01:40,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 5 [2020-10-13 13:01:40,089 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:40,107 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 13:01:40,108 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571827651] [2020-10-13 13:01:40,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 13:01:40,111 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-13 13:01:40,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198784595] [2020-10-13 13:01:40,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 13:01:40,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 13:01:40,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 13:01:40,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-13 13:01:40,137 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-10-13 13:01:40,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 13:01:40,193 INFO L93 Difference]: Finished difference Result 47 states and 56 transitions. [2020-10-13 13:01:40,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 13:01:40,195 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-10-13 13:01:40,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 13:01:40,210 INFO L225 Difference]: With dead ends: 47 [2020-10-13 13:01:40,211 INFO L226 Difference]: Without dead ends: 30 [2020-10-13 13:01:40,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-13 13:01:40,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-13 13:01:40,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-13 13:01:40,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-13 13:01:40,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-10-13 13:01:40,262 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-10-13 13:01:40,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 13:01:40,263 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-10-13 13:01:40,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 13:01:40,263 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-10-13 13:01:40,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-13 13:01:40,265 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 13:01:40,265 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 13:01:40,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-13 13:01:40,266 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 13:01:40,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 13:01:40,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-10-13 13:01:40,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 13:01:40,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337119762] [2020-10-13 13:01:40,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 13:01:40,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:40,283 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,334 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:40,335 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-13 13:01:40,335 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:40,335 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 56 [2020-10-13 13:01:40,335 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:40,336 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 13:01:40,336 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-13 13:01:40,336 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 13:01:40,337 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:40,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 13:01:40,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:40,352 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,354 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:40,355 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 13:01:40,355 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:40,355 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 13:01:40,356 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:40,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 13:01:40,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 13:01:40,356 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 13:01:40,357 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:40,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-10-13 13:01:40,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:40,377 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,413 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:40,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-10-13 13:01:40,414 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:40,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 41 [2020-10-13 13:01:40,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:40,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 13:01:40,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-13 13:01:40,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 13:01:40,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:40,442 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-13 13:01:40,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337119762] [2020-10-13 13:01:40,443 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-13 13:01:40,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-13 13:01:40,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694767048] [2020-10-13 13:01:40,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-13 13:01:40,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 13:01:40,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-13 13:01:40,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-13 13:01:40,446 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-10-13 13:01:40,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 13:01:40,549 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-10-13 13:01:40,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-13 13:01:40,550 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-10-13 13:01:40,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 13:01:40,552 INFO L225 Difference]: With dead ends: 36 [2020-10-13 13:01:40,552 INFO L226 Difference]: Without dead ends: 32 [2020-10-13 13:01:40,553 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 [2020-10-13 13:01:40,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-13 13:01:40,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-10-13 13:01:40,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-13 13:01:40,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-10-13 13:01:40,563 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-10-13 13:01:40,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 13:01:40,563 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-10-13 13:01:40,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-13 13:01:40,564 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-10-13 13:01:40,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-13 13:01:40,565 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 13:01:40,565 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 13:01:40,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-13 13:01:40,566 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 13:01:40,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 13:01:40,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-10-13 13:01:40,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 13:01:40,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045743939] [2020-10-13 13:01:40,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 13:01:40,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:40,586 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,634 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:40,652 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:41,481 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:41,481 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 38 [2020-10-13 13:01:41,481 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-13 13:01:41,482 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 901 [2020-10-13 13:01:41,482 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:41,482 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 13:01:41,482 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 15 [2020-10-13 13:01:41,483 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 13:01:41,483 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-13 13:01:41,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-13 13:01:41,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:41,496 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:41,498 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:41,499 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-13 13:01:41,499 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:41,499 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 13:01:41,500 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:41,500 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 13:01:41,501 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-13 13:01:41,501 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 13:01:41,501 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:41,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-10-13 13:01:41,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:41,521 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:41,558 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:41,558 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 26 [2020-10-13 13:01:41,558 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:41,559 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 40 [2020-10-13 13:01:41,559 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:41,560 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-13 13:01:41,560 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 3 [2020-10-13 13:01:41,560 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 7 [2020-10-13 13:01:41,561 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:41,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-10-13 13:01:41,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:41,594 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:41,601 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:41,602 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-13 13:01:41,602 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:41,603 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-13 13:01:41,603 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:41,604 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-13 13:01:41,604 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-10-13 13:01:41,604 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-13 13:01:41,605 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:41,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-10-13 13:01:41,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-13 13:01:41,627 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-13 13:01:41,629 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-13 13:01:41,629 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 9 [2020-10-13 13:01:41,630 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-13 13:01:41,630 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-13 13:01:41,630 FATAL L256 erpolLogProxyWrapper]: Heuristic: NARROWEST [2020-10-13 13:01:41,630 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-13 13:01:41,631 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 6 [2020-10-13 13:01:41,631 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-13 13:01:41,631 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-13 13:01:41,636 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-13 13:01:41,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045743939] [2020-10-13 13:01:41,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-13 13:01:41,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-13 13:01:41,637 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512297730] [2020-10-13 13:01:41,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-13 13:01:41,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-13 13:01:41,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-13 13:01:41,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-13 13:01:41,640 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 6 states. [2020-10-13 13:01:41,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-13 13:01:41,743 INFO L93 Difference]: Finished difference Result 58 states and 78 transitions. [2020-10-13 13:01:41,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-13 13:01:41,744 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-10-13 13:01:41,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-13 13:01:41,746 INFO L225 Difference]: With dead ends: 58 [2020-10-13 13:01:41,746 INFO L226 Difference]: Without dead ends: 34 [2020-10-13 13:01:41,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-10-13 13:01:41,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-13 13:01:41,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-10-13 13:01:41,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-13 13:01:41,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-10-13 13:01:41,757 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 26 [2020-10-13 13:01:41,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-13 13:01:41,758 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-10-13 13:01:41,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-13 13:01:41,758 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-10-13 13:01:41,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-13 13:01:41,760 INFO L414 BasicCegarLoop]: Found error trace [2020-10-13 13:01:41,761 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-13 13:01:41,761 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-13 13:01:41,761 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-13 13:01:41,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-13 13:01:41,762 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-10-13 13:01:41,762 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-13 13:01:41,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392142887] [2020-10-13 13:01:41,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-13 13:01:41,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-13 13:01:41,779 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-13 13:01:41,779 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-13 13:01:41,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-13 13:01:41,834 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 13.10 01:01:41 BoogieIcfgContainer [2020-10-13 13:01:41,834 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-13 13:01:41,839 INFO L168 Benchmark]: Toolchain (without parser) took 2865.62 ms. Allocated memory was 142.1 MB in the beginning and 232.8 MB in the end (delta: 90.7 MB). Free memory was 103.8 MB in the beginning and 102.4 MB in the end (delta: 1.5 MB). Peak memory consumption was 92.2 MB. Max. memory is 7.1 GB. [2020-10-13 13:01:41,842 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 142.1 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-10-13 13:01:41,843 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.08 ms. Allocated memory is still 142.1 MB. Free memory was 103.6 MB in the beginning and 93.8 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-10-13 13:01:41,846 INFO L168 Benchmark]: Boogie Preprocessor took 103.30 ms. Allocated memory was 142.1 MB in the beginning and 203.9 MB in the end (delta: 61.9 MB). Free memory was 93.8 MB in the beginning and 182.7 MB in the end (delta: -89.0 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. [2020-10-13 13:01:41,848 INFO L168 Benchmark]: RCFGBuilder took 267.47 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 169.5 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-10-13 13:01:41,857 INFO L168 Benchmark]: TraceAbstraction took 2249.96 ms. Allocated memory was 203.9 MB in the beginning and 232.8 MB in the end (delta: 28.8 MB). Free memory was 168.9 MB in the beginning and 102.4 MB in the end (delta: 66.5 MB). Peak memory consumption was 95.3 MB. Max. memory is 7.1 GB. [2020-10-13 13:01:41,871 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 142.1 MB. Free memory was 122.4 MB in the beginning and 122.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.08 ms. Allocated memory is still 142.1 MB. Free memory was 103.6 MB in the beginning and 93.8 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 103.30 ms. Allocated memory was 142.1 MB in the beginning and 203.9 MB in the end (delta: 61.9 MB). Free memory was 93.8 MB in the beginning and 182.7 MB in the end (delta: -89.0 MB). Peak memory consumption was 13.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 267.47 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 169.5 MB in the end (delta: 12.7 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2249.96 ms. Allocated memory was 203.9 MB in the beginning and 232.8 MB in the end (delta: 28.8 MB). Free memory was 168.9 MB in the beginning and 102.4 MB in the end (delta: 66.5 MB). Peak memory consumption was 95.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 2; [L37] CALL, EXPR fibo1(x) [L8] COND FALSE !(n < 1) [L10] COND FALSE !(n == 1) [L13] CALL, EXPR fibo2(n-1) [L18] COND FALSE !(n < 1) [L20] COND TRUE n == 1 [L21] return 1; [L13] RET, EXPR fibo2(n-1) [L13] CALL, EXPR fibo2(n-2) [L18] COND TRUE n < 1 [L19] return 0; [L13] RET, EXPR fibo2(n-2) [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 1 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 97 SDtfs, 28 SDslu, 239 SDs, 0 SdLazy, 88 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=0, 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, 4 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 1.5s InterpolantComputationTime, 80 NumberOfCodeBlocks, 80 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 50 ConstructedInterpolants, 0 QuantifiedInterpolants, 1414 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 2 PerfectInterpolantSequences, 1/4 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...