/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 enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-c90d42b [2020-09-25 12:31:20,673 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-25 12:31:20,677 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-25 12:31:20,704 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-25 12:31:20,704 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-25 12:31:20,706 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-25 12:31:20,707 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-25 12:31:20,709 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-25 12:31:20,711 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-25 12:31:20,712 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-25 12:31:20,713 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-25 12:31:20,714 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-25 12:31:20,714 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-25 12:31:20,715 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-25 12:31:20,716 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-25 12:31:20,718 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-25 12:31:20,719 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-25 12:31:20,720 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-25 12:31:20,722 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-25 12:31:20,724 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-25 12:31:20,725 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-25 12:31:20,727 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-25 12:31:20,728 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-25 12:31:20,729 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-25 12:31:20,734 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-09-25 12:31:20,734 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-09-25 12:31:20,734 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-09-25 12:31:20,735 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-09-25 12:31:20,736 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-09-25 12:31:20,740 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-09-25 12:31:20,740 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-25 12:31:20,741 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-25 12:31:20,742 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-25 12:31:20,743 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-25 12:31:20,744 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-25 12:31:20,744 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-25 12:31:20,745 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-25 12:31:20,745 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-25 12:31:20,745 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-25 12:31:20,746 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-25 12:31:20,747 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-25 12:31:20,748 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 [2020-09-25 12:31:20,774 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-25 12:31:20,775 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-25 12:31:20,776 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-25 12:31:20,776 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-25 12:31:20,776 INFO L138 SettingsManager]: * Use SBE=true [2020-09-25 12:31:20,776 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-25 12:31:20,777 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-25 12:31:20,777 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-25 12:31:20,777 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-25 12:31:20,777 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-25 12:31:20,777 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-25 12:31:20,778 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-25 12:31:20,778 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-25 12:31:20,778 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-25 12:31:20,778 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-25 12:31:20,778 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-25 12:31:20,779 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-25 12:31:20,779 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-25 12:31:20,779 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-25 12:31:20,779 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-25 12:31:20,779 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-25 12:31:20,780 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-25 12:31:20,780 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-25 12:31:20,780 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-25 12:31:20,780 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-25 12:31:20,781 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-25 12:31:20,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-25 12:31:20,781 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-25 12:31:20,781 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-25 12:31:20,781 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;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;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;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;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;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;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;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;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;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;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;enumeration-timeout=5000;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3;log-additional-information=true; [2020-09-25 12:31:21,280 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-25 12:31:21,296 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-25 12:31:21,300 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-25 12:31:21,302 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-25 12:31:21,303 INFO L275 PluginConnector]: CDTParser initialized [2020-09-25 12:31:21,304 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-09-25 12:31:21,401 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d40a9dd23/62d56f3d77274892b2a2709489d9ca9d/FLAGf8380f7c9 [2020-09-25 12:31:21,965 INFO L306 CDTParser]: Found 1 translation units. [2020-09-25 12:31:21,966 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-09-25 12:31:21,975 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d40a9dd23/62d56f3d77274892b2a2709489d9ca9d/FLAGf8380f7c9 [2020-09-25 12:31:22,293 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d40a9dd23/62d56f3d77274892b2a2709489d9ca9d [2020-09-25 12:31:22,307 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-25 12:31:22,313 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-25 12:31:22,314 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-25 12:31:22,315 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-25 12:31:22,319 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-25 12:31:22,321 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,325 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b51621b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22, skipping insertion in model container [2020-09-25 12:31:22,326 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,335 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-25 12:31:22,360 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-25 12:31:22,590 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 12:31:22,595 INFO L203 MainTranslator]: Completed pre-run [2020-09-25 12:31:22,623 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-25 12:31:22,647 INFO L208 MainTranslator]: Completed translation [2020-09-25 12:31:22,647 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22 WrapperNode [2020-09-25 12:31:22,647 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-25 12:31:22,648 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-25 12:31:22,648 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-25 12:31:22,648 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-25 12:31:22,741 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,741 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,750 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,751 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,759 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,766 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,768 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (1/1) ... [2020-09-25 12:31:22,770 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-25 12:31:22,771 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-25 12:31:22,771 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-25 12:31:22,771 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-25 12:31:22,772 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (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 [2020-09-25 12:31:22,856 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-25 12:31:22,856 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-25 12:31:22,856 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-25 12:31:22,857 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-25 12:31:22,857 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-25 12:31:22,857 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-25 12:31:22,857 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-25 12:31:22,857 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-09-25 12:31:22,858 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-09-25 12:31:22,858 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-25 12:31:22,858 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-09-25 12:31:22,858 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-09-25 12:31:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-09-25 12:31:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-09-25 12:31:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-25 12:31:22,859 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-25 12:31:23,234 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-25 12:31:23,234 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-09-25 12:31:23,240 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 12:31:23 BoogieIcfgContainer [2020-09-25 12:31:23,240 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-25 12:31:23,241 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-25 12:31:23,241 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-25 12:31:23,245 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-25 12:31:23,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.09 12:31:22" (1/3) ... [2020-09-25 12:31:23,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ae48bb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 12:31:23, skipping insertion in model container [2020-09-25 12:31:23,247 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.09 12:31:22" (2/3) ... [2020-09-25 12:31:23,247 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ae48bb8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.09 12:31:23, skipping insertion in model container [2020-09-25 12:31:23,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.09 12:31:23" (3/3) ... [2020-09-25 12:31:23,251 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-09-25 12:31:23,263 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-25 12:31:23,274 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-25 12:31:23,297 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-25 12:31:23,331 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-25 12:31:23,331 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-25 12:31:23,331 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-25 12:31:23,331 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-25 12:31:23,331 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-25 12:31:23,331 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-25 12:31:23,332 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-25 12:31:23,332 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-25 12:31:23,356 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states. [2020-09-25 12:31:23,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-25 12:31:23,364 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:23,365 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, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:23,366 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:23,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:23,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1584943199, now seen corresponding path program 1 times [2020-09-25 12:31:23,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:23,382 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872792136] [2020-09-25 12:31:23,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:23,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:23,564 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:23,633 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:23,772 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:24,294 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:24,295 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-09-25 12:31:24,296 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-09-25 12:31:24,296 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 763 [2020-09-25 12:31:24,300 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:24,300 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:24,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-09-25 12:31:24,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-09-25 12:31:24,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 13 [2020-09-25 12:31:24,302 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-09-25 12:31:24,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:24,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:24,431 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:24,440 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:24,440 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:24,440 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:24,441 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 12 [2020-09-25 12:31:24,442 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:24,442 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:24,442 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:24,442 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:24,443 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:24,443 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:24,469 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 12:31:24,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872792136] [2020-09-25 12:31:24,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 12:31:24,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-25 12:31:24,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876442525] [2020-09-25 12:31:24,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-25 12:31:24,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:24,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-25 12:31:24,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-25 12:31:24,506 INFO L87 Difference]: Start difference. First operand 66 states. Second operand 5 states. [2020-09-25 12:31:24,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:24,830 INFO L93 Difference]: Finished difference Result 139 states and 161 transitions. [2020-09-25 12:31:24,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-25 12:31:24,832 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-09-25 12:31:24,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:24,846 INFO L225 Difference]: With dead ends: 139 [2020-09-25 12:31:24,846 INFO L226 Difference]: Without dead ends: 75 [2020-09-25 12:31:24,851 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-25 12:31:24,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-09-25 12:31:24,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 58. [2020-09-25 12:31:24,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-09-25 12:31:24,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-09-25 12:31:24,934 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 31 [2020-09-25 12:31:24,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:24,935 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-09-25 12:31:24,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-25 12:31:24,935 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-09-25 12:31:24,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-25 12:31:24,937 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:24,937 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:24,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-25 12:31:24,938 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:24,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:24,939 INFO L82 PathProgramCache]: Analyzing trace with hash 419131922, now seen corresponding path program 1 times [2020-09-25 12:31:24,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:24,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467344719] [2020-09-25 12:31:24,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:24,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:24,977 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:25,031 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:25,125 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:25,350 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:25,642 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:25,934 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:26,578 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:26,579 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 50 [2020-09-25 12:31:26,579 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-09-25 12:31:26,579 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1614 [2020-09-25 12:31:26,580 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:26,580 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:26,580 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 15 [2020-09-25 12:31:26,580 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-09-25 12:31:26,581 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-09-25 12:31:26,581 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:26,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:27,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:27,001 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:27,007 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:27,008 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:27,008 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:27,008 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-09-25 12:31:27,008 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:27,009 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:27,009 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:27,009 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:27,009 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:27,010 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:27,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 12:31:27,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467344719] [2020-09-25 12:31:27,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 12:31:27,019 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-25 12:31:27,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073416584] [2020-09-25 12:31:27,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-25 12:31:27,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:27,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-25 12:31:27,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2020-09-25 12:31:27,023 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 17 states. [2020-09-25 12:31:28,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:28,159 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2020-09-25 12:31:28,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-25 12:31:28,160 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-09-25 12:31:28,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:28,162 INFO L225 Difference]: With dead ends: 113 [2020-09-25 12:31:28,162 INFO L226 Difference]: Without dead ends: 111 [2020-09-25 12:31:28,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=214, Invalid=1046, Unknown=0, NotChecked=0, Total=1260 [2020-09-25 12:31:28,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-09-25 12:31:28,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 78. [2020-09-25 12:31:28,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-09-25 12:31:28,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2020-09-25 12:31:28,178 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 41 [2020-09-25 12:31:28,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:28,178 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2020-09-25 12:31:28,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-25 12:31:28,179 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2020-09-25 12:31:28,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-25 12:31:28,181 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:28,181 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:28,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-25 12:31:28,181 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:28,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:28,182 INFO L82 PathProgramCache]: Analyzing trace with hash -114770216, now seen corresponding path program 2 times [2020-09-25 12:31:28,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:28,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017718072] [2020-09-25 12:31:28,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:28,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:28,205 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:28,239 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:28,261 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:28,440 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:28,838 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:29,428 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:29,994 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:30,624 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:31,931 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:31,932 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 60 [2020-09-25 12:31:31,932 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 12:31:31,932 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3734 [2020-09-25 12:31:31,933 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:31,933 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:31,933 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-09-25 12:31:31,934 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 26 [2020-09-25 12:31:31,934 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-09-25 12:31:31,934 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:32,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:32,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:32,395 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:32,400 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:32,400 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:32,400 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:32,401 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-09-25 12:31:32,401 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:32,401 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:32,401 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:32,402 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:32,402 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:32,402 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:32,416 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-25 12:31:32,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017718072] [2020-09-25 12:31:32,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 12:31:32,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-25 12:31:32,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90453292] [2020-09-25 12:31:32,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-25 12:31:32,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:32,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-25 12:31:32,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2020-09-25 12:31:32,421 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand 21 states. [2020-09-25 12:31:34,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:34,103 INFO L93 Difference]: Finished difference Result 134 states and 141 transitions. [2020-09-25 12:31:34,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-25 12:31:34,104 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 51 [2020-09-25 12:31:34,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:34,108 INFO L225 Difference]: With dead ends: 134 [2020-09-25 12:31:34,109 INFO L226 Difference]: Without dead ends: 132 [2020-09-25 12:31:34,111 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=267, Invalid=1895, Unknown=0, NotChecked=0, Total=2162 [2020-09-25 12:31:34,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-09-25 12:31:34,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 88. [2020-09-25 12:31:34,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-09-25 12:31:34,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2020-09-25 12:31:34,126 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 51 [2020-09-25 12:31:34,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:34,126 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2020-09-25 12:31:34,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-25 12:31:34,127 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2020-09-25 12:31:34,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-09-25 12:31:34,129 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:34,129 INFO L422 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:34,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-25 12:31:34,130 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:34,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:34,130 INFO L82 PathProgramCache]: Analyzing trace with hash 558450492, now seen corresponding path program 1 times [2020-09-25 12:31:34,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:34,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1365989232] [2020-09-25 12:31:34,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:34,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:34,153 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:34,175 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:34,320 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:34,341 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:34,570 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:36,542 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:36,542 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 68 [2020-09-25 12:31:36,543 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-09-25 12:31:36,543 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2397 [2020-09-25 12:31:36,543 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:36,543 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:36,544 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-09-25 12:31:36,544 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 12:31:36,544 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 37 [2020-09-25 12:31:36,544 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:36,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:36,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:36,630 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:36,635 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:36,636 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:36,636 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:36,636 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-25 12:31:36,637 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:36,637 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:36,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:36,637 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:36,638 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:36,638 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:36,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-09-25 12:31:36,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:36,644 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:36,653 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:36,653 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 12:31:36,654 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:36,654 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-09-25 12:31:36,655 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:36,655 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:36,655 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 12:31:36,656 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:36,656 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 12:31:36,656 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:36,666 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-25 12:31:36,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1365989232] [2020-09-25 12:31:36,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-25 12:31:36,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-09-25 12:31:36,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221871450] [2020-09-25 12:31:36,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-25 12:31:36,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:36,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-25 12:31:36,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-09-25 12:31:36,670 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand 8 states. [2020-09-25 12:31:36,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:36,903 INFO L93 Difference]: Finished difference Result 170 states and 179 transitions. [2020-09-25 12:31:36,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-25 12:31:36,904 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 57 [2020-09-25 12:31:36,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:36,905 INFO L225 Difference]: With dead ends: 170 [2020-09-25 12:31:36,906 INFO L226 Difference]: Without dead ends: 105 [2020-09-25 12:31:36,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-09-25 12:31:36,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-09-25 12:31:36,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 89. [2020-09-25 12:31:36,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-09-25 12:31:36,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2020-09-25 12:31:36,927 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 57 [2020-09-25 12:31:36,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:36,928 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2020-09-25 12:31:36,928 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-25 12:31:36,928 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2020-09-25 12:31:36,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-25 12:31:36,930 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:36,931 INFO L422 BasicCegarLoop]: trace histogram [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, 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] [2020-09-25 12:31:36,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-25 12:31:36,931 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:36,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:36,932 INFO L82 PathProgramCache]: Analyzing trace with hash -280271430, now seen corresponding path program 1 times [2020-09-25 12:31:36,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:36,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [464566396] [2020-09-25 12:31:36,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:36,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:36,972 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:37,007 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:38,991 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:38,991 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 75 [2020-09-25 12:31:38,991 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 12:31:38,992 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2032 [2020-09-25 12:31:38,992 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:38,992 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:38,992 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-25 12:31:38,992 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 12:31:38,993 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 44 [2020-09-25 12:31:38,993 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:39,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:39,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:39,086 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:39,091 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:39,091 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:39,091 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:39,092 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-25 12:31:39,092 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:39,092 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:39,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:39,093 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:39,093 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:39,093 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:39,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2020-09-25 12:31:39,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:39,099 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:39,108 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:39,108 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 12:31:39,109 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:39,109 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 10 [2020-09-25 12:31:39,109 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:39,109 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:39,109 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 12:31:39,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:39,110 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 12:31:39,110 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:39,118 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-09-25 12:31:39,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [464566396] [2020-09-25 12:31:39,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 12:31:39,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-09-25 12:31:39,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987639907] [2020-09-25 12:31:39,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-25 12:31:39,121 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:39,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-25 12:31:39,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-09-25 12:31:39,121 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand 10 states. [2020-09-25 12:31:39,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:39,430 INFO L93 Difference]: Finished difference Result 185 states and 196 transitions. [2020-09-25 12:31:39,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-25 12:31:39,431 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 64 [2020-09-25 12:31:39,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:39,433 INFO L225 Difference]: With dead ends: 185 [2020-09-25 12:31:39,433 INFO L226 Difference]: Without dead ends: 152 [2020-09-25 12:31:39,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-09-25 12:31:39,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-09-25 12:31:39,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 136. [2020-09-25 12:31:39,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-09-25 12:31:39,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 142 transitions. [2020-09-25 12:31:39,448 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 142 transitions. Word has length 64 [2020-09-25 12:31:39,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:39,449 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 142 transitions. [2020-09-25 12:31:39,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-25 12:31:39,449 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 142 transitions. [2020-09-25 12:31:39,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-09-25 12:31:39,451 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:39,451 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:39,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-25 12:31:39,452 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:39,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:39,452 INFO L82 PathProgramCache]: Analyzing trace with hash -38012004, now seen corresponding path program 1 times [2020-09-25 12:31:39,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:39,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841807237] [2020-09-25 12:31:39,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:39,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:39,482 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:39,793 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:39,898 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:40,211 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:40,490 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:40,842 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:43,387 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:43,952 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:44,487 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:44,488 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 77 [2020-09-25 12:31:44,488 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 8 [2020-09-25 12:31:44,488 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5018 [2020-09-25 12:31:44,488 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:44,489 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:44,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 19 [2020-09-25 12:31:44,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 12:31:44,489 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 53 [2020-09-25 12:31:44,489 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:45,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:45,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:45,081 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:45,085 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:45,086 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:45,086 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:45,086 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-25 12:31:45,087 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:45,087 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:45,087 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:45,087 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:45,088 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:45,088 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:45,107 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-25 12:31:45,107 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841807237] [2020-09-25 12:31:45,108 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 12:31:45,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-25 12:31:45,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154976341] [2020-09-25 12:31:45,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-25 12:31:45,109 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:45,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-25 12:31:45,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=268, Unknown=0, NotChecked=0, Total=306 [2020-09-25 12:31:45,110 INFO L87 Difference]: Start difference. First operand 136 states and 142 transitions. Second operand 18 states. [2020-09-25 12:31:46,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:46,338 INFO L93 Difference]: Finished difference Result 158 states and 164 transitions. [2020-09-25 12:31:46,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-25 12:31:46,339 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 68 [2020-09-25 12:31:46,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:46,341 INFO L225 Difference]: With dead ends: 158 [2020-09-25 12:31:46,341 INFO L226 Difference]: Without dead ends: 112 [2020-09-25 12:31:46,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=266, Invalid=1294, Unknown=0, NotChecked=0, Total=1560 [2020-09-25 12:31:46,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-09-25 12:31:46,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 96. [2020-09-25 12:31:46,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-09-25 12:31:46,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2020-09-25 12:31:46,353 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 68 [2020-09-25 12:31:46,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:46,354 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2020-09-25 12:31:46,354 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-25 12:31:46,354 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2020-09-25 12:31:46,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-09-25 12:31:46,355 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:46,356 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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] [2020-09-25 12:31:46,356 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-25 12:31:46,356 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:46,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:46,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1059036540, now seen corresponding path program 2 times [2020-09-25 12:31:46,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:46,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1247856864] [2020-09-25 12:31:46,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:46,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:46,388 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:46,456 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:48,075 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:48,075 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 82 [2020-09-25 12:31:48,076 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-09-25 12:31:48,076 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1699 [2020-09-25 12:31:48,076 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:48,076 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:48,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 8 [2020-09-25 12:31:48,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 41 [2020-09-25 12:31:48,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 33 [2020-09-25 12:31:48,077 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:48,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:48,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:48,153 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:48,157 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:48,157 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:48,157 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:48,158 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5 [2020-09-25 12:31:48,158 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:48,158 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:48,158 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:48,158 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:48,159 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:48,159 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:48,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-09-25 12:31:48,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:48,163 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:48,169 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:48,169 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 10 [2020-09-25 12:31:48,169 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:48,170 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 6 [2020-09-25 12:31:48,170 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:48,170 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:48,170 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-09-25 12:31:48,171 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:48,171 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-09-25 12:31:48,171 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:48,178 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-09-25 12:31:48,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1247856864] [2020-09-25 12:31:48,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 12:31:48,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-25 12:31:48,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697632187] [2020-09-25 12:31:48,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-25 12:31:48,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:48,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-25 12:31:48,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-25 12:31:48,181 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand 9 states. [2020-09-25 12:31:48,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:48,470 INFO L93 Difference]: Finished difference Result 129 states and 134 transitions. [2020-09-25 12:31:48,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-09-25 12:31:48,471 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 71 [2020-09-25 12:31:48,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:48,472 INFO L225 Difference]: With dead ends: 129 [2020-09-25 12:31:48,472 INFO L226 Difference]: Without dead ends: 96 [2020-09-25 12:31:48,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2020-09-25 12:31:48,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-25 12:31:48,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2020-09-25 12:31:48,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-09-25 12:31:48,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 99 transitions. [2020-09-25 12:31:48,492 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 99 transitions. Word has length 71 [2020-09-25 12:31:48,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:48,493 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 99 transitions. [2020-09-25 12:31:48,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-25 12:31:48,496 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 99 transitions. [2020-09-25 12:31:48,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-09-25 12:31:48,498 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:48,498 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:48,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-25 12:31:48,498 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:48,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:48,501 INFO L82 PathProgramCache]: Analyzing trace with hash 1430946398, now seen corresponding path program 2 times [2020-09-25 12:31:48,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:48,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105179179] [2020-09-25 12:31:48,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:48,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:48,529 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:48,770 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:49,118 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:49,284 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:49,513 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:49,937 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:51,009 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:53,522 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:53,523 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 84 [2020-09-25 12:31:53,523 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 7 [2020-09-25 12:31:53,523 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 5005 [2020-09-25 12:31:53,523 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:53,524 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:53,524 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 21 [2020-09-25 12:31:53,524 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 23 [2020-09-25 12:31:53,524 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 60 [2020-09-25 12:31:53,524 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:54,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-25 12:31:54,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-25 12:31:54,005 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-09-25 12:31:54,008 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-09-25 12:31:54,009 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 11 [2020-09-25 12:31:54,009 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-09-25 12:31:54,009 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-09-25 12:31:54,009 FATAL L256 erpolLogProxyWrapper]: Heuristic: SMALLESTAMONGWIDE [2020-09-25 12:31:54,009 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.3 [2020-09-25 12:31:54,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-09-25 12:31:54,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 2 [2020-09-25 12:31:54,010 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-09-25 12:31:54,010 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-09-25 12:31:54,029 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-09-25 12:31:54,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105179179] [2020-09-25 12:31:54,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-25 12:31:54,030 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-09-25 12:31:54,030 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947990675] [2020-09-25 12:31:54,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-09-25 12:31:54,032 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-25 12:31:54,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-09-25 12:31:54,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=414, Unknown=0, NotChecked=0, Total=462 [2020-09-25 12:31:54,033 INFO L87 Difference]: Start difference. First operand 96 states and 99 transitions. Second operand 22 states. [2020-09-25 12:31:55,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-25 12:31:55,704 INFO L93 Difference]: Finished difference Result 194 states and 202 transitions. [2020-09-25 12:31:55,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-25 12:31:55,707 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 75 [2020-09-25 12:31:55,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-25 12:31:55,709 INFO L225 Difference]: With dead ends: 194 [2020-09-25 12:31:55,709 INFO L226 Difference]: Without dead ends: 192 [2020-09-25 12:31:55,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 499 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=300, Invalid=2250, Unknown=0, NotChecked=0, Total=2550 [2020-09-25 12:31:55,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-09-25 12:31:55,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 127. [2020-09-25 12:31:55,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-09-25 12:31:55,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 132 transitions. [2020-09-25 12:31:55,720 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 132 transitions. Word has length 75 [2020-09-25 12:31:55,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-25 12:31:55,720 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 132 transitions. [2020-09-25 12:31:55,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-09-25 12:31:55,721 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 132 transitions. [2020-09-25 12:31:55,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-09-25 12:31:55,722 INFO L414 BasicCegarLoop]: Found error trace [2020-09-25 12:31:55,722 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-25 12:31:55,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-25 12:31:55,723 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-25 12:31:55,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-25 12:31:55,723 INFO L82 PathProgramCache]: Analyzing trace with hash 810536514, now seen corresponding path program 3 times [2020-09-25 12:31:55,723 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-25 12:31:55,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [713224983] [2020-09-25 12:31:55,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-25 12:31:55,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-25 12:31:55,743 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-09-25 12:31:55,743 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-25 12:31:55,748 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-25 12:31:55,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.09 12:31:55 BoogieIcfgContainer [2020-09-25 12:31:55,771 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-25 12:31:55,774 INFO L168 Benchmark]: Toolchain (without parser) took 33464.67 ms. Allocated memory was 139.5 MB in the beginning and 438.8 MB in the end (delta: 299.4 MB). Free memory was 103.0 MB in the beginning and 250.3 MB in the end (delta: -147.3 MB). Peak memory consumption was 152.1 MB. Max. memory is 7.1 GB. [2020-09-25 12:31:55,775 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-09-25 12:31:55,776 INFO L168 Benchmark]: CACSL2BoogieTranslator took 333.37 ms. Allocated memory is still 139.5 MB. Free memory was 102.3 MB in the beginning and 92.0 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-09-25 12:31:55,777 INFO L168 Benchmark]: Boogie Preprocessor took 122.32 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 92.0 MB in the beginning and 179.5 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-09-25 12:31:55,778 INFO L168 Benchmark]: RCFGBuilder took 469.36 ms. Allocated memory is still 201.9 MB. Free memory was 179.5 MB in the beginning and 160.4 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. [2020-09-25 12:31:55,779 INFO L168 Benchmark]: TraceAbstraction took 32529.63 ms. Allocated memory was 201.9 MB in the beginning and 438.8 MB in the end (delta: 237.0 MB). Free memory was 159.7 MB in the beginning and 250.3 MB in the end (delta: -90.5 MB). Peak memory consumption was 146.4 MB. Max. memory is 7.1 GB. [2020-09-25 12:31:55,782 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 333.37 ms. Allocated memory is still 139.5 MB. Free memory was 102.3 MB in the beginning and 92.0 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 122.32 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 92.0 MB in the beginning and 179.5 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 469.36 ms. Allocated memory is still 201.9 MB. Free memory was 179.5 MB in the beginning and 160.4 MB in the end (delta: 19.1 MB). Peak memory consumption was 19.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 32529.63 ms. Allocated memory was 201.9 MB in the beginning and 438.8 MB in the end (delta: 237.0 MB). Free memory was 159.7 MB in the beginning and 250.3 MB in the end (delta: -90.5 MB). Peak memory consumption was 146.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i