/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --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 language data_model -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.0-0f64333 [2020-10-28 15:18:37,554 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-28 15:18:37,558 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-28 15:18:37,623 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-28 15:18:37,624 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-28 15:18:37,633 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-28 15:18:37,635 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-28 15:18:37,640 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-28 15:18:37,643 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-28 15:18:37,651 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-28 15:18:37,653 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-28 15:18:37,654 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-28 15:18:37,655 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-28 15:18:37,658 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-28 15:18:37,661 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-28 15:18:37,664 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-28 15:18:37,665 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-28 15:18:37,669 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-28 15:18:37,676 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-28 15:18:37,684 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-28 15:18:37,689 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-28 15:18:37,690 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-28 15:18:37,692 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-28 15:18:37,693 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-28 15:18:37,698 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-28 15:18:37,698 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-28 15:18:37,699 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-28 15:18:37,701 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-28 15:18:37,702 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-28 15:18:37,703 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-28 15:18:37,703 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-28 15:18:37,704 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-28 15:18:37,706 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-28 15:18:37,707 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-28 15:18:37,708 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-28 15:18:37,709 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-28 15:18:37,709 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-28 15:18:37,710 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-28 15:18:37,710 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-28 15:18:37,711 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-28 15:18:37,712 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-28 15:18:37,713 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 [2020-10-28 15:18:37,769 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-28 15:18:37,769 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-28 15:18:37,774 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-28 15:18:37,775 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-28 15:18:37,775 INFO L138 SettingsManager]: * Use SBE=true [2020-10-28 15:18:37,775 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-28 15:18:37,775 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-28 15:18:37,775 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-28 15:18:37,776 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-28 15:18:37,776 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-28 15:18:37,777 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-28 15:18:37,777 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-28 15:18:37,777 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-28 15:18:37,778 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-28 15:18:37,778 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-28 15:18:37,778 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-28 15:18:37,778 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-28 15:18:37,778 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-28 15:18:37,779 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-28 15:18:37,779 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-28 15:18:37,779 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-28 15:18:37,779 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-28 15:18:37,779 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-28 15:18:37,780 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-28 15:18:37,780 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-28 15:18:37,780 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-28 15:18:37,780 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-28 15:18:37,780 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-28 15:18:37,781 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-28 15:18:37,781 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true;unknown-allowed=true; [2020-10-28 15:18:38,201 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-28 15:18:38,241 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-28 15:18:38,244 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-28 15:18:38,246 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-28 15:18:38,247 INFO L275 PluginConnector]: CDTParser initialized [2020-10-28 15:18:38,248 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-10-28 15:18:38,348 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f02c9d3cb/7a82594287e042f5a7f184c598e1f572/FLAG0a118ca7e [2020-10-28 15:18:39,099 INFO L306 CDTParser]: Found 1 translation units. [2020-10-28 15:18:39,100 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-2.i [2020-10-28 15:18:39,109 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f02c9d3cb/7a82594287e042f5a7f184c598e1f572/FLAG0a118ca7e [2020-10-28 15:18:39,459 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/f02c9d3cb/7a82594287e042f5a7f184c598e1f572 [2020-10-28 15:18:39,471 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-28 15:18:39,479 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-28 15:18:39,484 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-28 15:18:39,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-28 15:18:39,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-28 15:18:39,489 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,494 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fb9ef54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39, skipping insertion in model container [2020-10-28 15:18:39,494 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,504 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-28 15:18:39,531 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-28 15:18:39,765 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 15:18:39,775 INFO L203 MainTranslator]: Completed pre-run [2020-10-28 15:18:39,802 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-28 15:18:39,822 INFO L208 MainTranslator]: Completed translation [2020-10-28 15:18:39,824 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39 WrapperNode [2020-10-28 15:18:39,824 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-28 15:18:39,825 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-28 15:18:39,826 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-28 15:18:39,826 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-28 15:18:39,838 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,839 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,848 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,848 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,859 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,866 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (1/1) ... [2020-10-28 15:18:39,871 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-28 15:18:39,872 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-28 15:18:39,873 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-28 15:18:39,873 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-28 15:18:39,874 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (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 [2020-10-28 15:18:39,958 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-28 15:18:39,959 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-28 15:18:39,959 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-28 15:18:39,959 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-28 15:18:39,959 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-28 15:18:39,959 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-28 15:18:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-28 15:18:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-28 15:18:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2020-10-28 15:18:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2020-10-28 15:18:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-28 15:18:39,960 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-28 15:18:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-28 15:18:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-28 15:18:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-28 15:18:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-28 15:18:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-28 15:18:39,961 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-28 15:18:39,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-28 15:18:39,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-28 15:18:39,962 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-28 15:18:39,962 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-28 15:18:40,370 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-28 15:18:40,371 INFO L298 CfgBuilder]: Removed 5 assume(true) statements. [2020-10-28 15:18:40,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 03:18:40 BoogieIcfgContainer [2020-10-28 15:18:40,373 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-28 15:18:40,375 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-28 15:18:40,375 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-28 15:18:40,379 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-28 15:18:40,380 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.10 03:18:39" (1/3) ... [2020-10-28 15:18:40,381 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a225a5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 03:18:40, skipping insertion in model container [2020-10-28 15:18:40,381 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.10 03:18:39" (2/3) ... [2020-10-28 15:18:40,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6a225a5e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.10 03:18:40, skipping insertion in model container [2020-10-28 15:18:40,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.10 03:18:40" (3/3) ... [2020-10-28 15:18:40,384 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-10-28 15:18:40,399 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-28 15:18:40,405 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-28 15:18:40,433 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-28 15:18:40,489 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-28 15:18:40,490 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-28 15:18:40,490 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-28 15:18:40,490 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-28 15:18:40,490 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-28 15:18:40,491 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-28 15:18:40,491 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-28 15:18:40,491 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-28 15:18:40,523 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2020-10-28 15:18:40,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-28 15:18:40,532 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:40,534 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-28 15:18:40,535 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:40,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:40,546 INFO L82 PathProgramCache]: Analyzing trace with hash 1881354354, now seen corresponding path program 1 times [2020-10-28 15:18:40,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:40,559 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837719180] [2020-10-28 15:18:40,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:40,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:40,882 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:40,957 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:40,983 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:41,008 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:41,048 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:41,510 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:41,510 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 34 [2020-10-28 15:18:41,511 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-28 15:18:41,511 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 703 [2020-10-28 15:18:41,514 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:41,514 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:41,514 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:41,514 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 18 [2020-10-28 15:18:41,515 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:41,515 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-28 15:18:41,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 15:18:41,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:41,604 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:41,610 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:41,610 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 15:18:41,610 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 15:18:41,611 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-28 15:18:41,611 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:41,611 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:41,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:41,611 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 15:18:41,612 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:41,612 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:41,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 15:18:41,639 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837719180] [2020-10-28 15:18:41,641 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 15:18:41,642 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-28 15:18:41,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638517909] [2020-10-28 15:18:41,651 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-28 15:18:41,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 15:18:41,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-28 15:18:41,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-28 15:18:41,677 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 3 states. [2020-10-28 15:18:41,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 15:18:41,809 INFO L93 Difference]: Finished difference Result 69 states and 99 transitions. [2020-10-28 15:18:41,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-28 15:18:41,811 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-10-28 15:18:41,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 15:18:41,820 INFO L225 Difference]: With dead ends: 69 [2020-10-28 15:18:41,820 INFO L226 Difference]: Without dead ends: 30 [2020-10-28 15:18:41,824 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-28 15:18:41,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-28 15:18:41,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-28 15:18:41,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-28 15:18:41,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-10-28 15:18:41,871 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-10-28 15:18:41,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 15:18:41,872 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-10-28 15:18:41,872 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-28 15:18:41,872 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-10-28 15:18:41,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-10-28 15:18:41,873 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:41,874 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] [2020-10-28 15:18:41,874 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-28 15:18:41,874 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:41,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:41,875 INFO L82 PathProgramCache]: Analyzing trace with hash 1024336198, now seen corresponding path program 1 times [2020-10-28 15:18:41,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:41,876 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1748401026] [2020-10-28 15:18:41,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:41,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:41,900 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:41,916 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:42,015 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:42,015 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-28 15:18:42,016 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 15:18:42,016 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 121 [2020-10-28 15:18:42,016 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:42,016 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:42,016 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-28 15:18:42,017 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 14 [2020-10-28 15:18:42,017 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-28 15:18:42,017 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:42,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 15:18:42,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:42,068 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:42,075 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:42,076 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 15:18:42,076 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 15:18:42,076 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 8 [2020-10-28 15:18:42,077 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:42,077 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:42,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:42,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 15:18:42,077 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:42,078 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 15:18:42,084 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-28 15:18:42,085 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1748401026] [2020-10-28 15:18:42,085 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-28 15:18:42,085 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-28 15:18:42,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049981135] [2020-10-28 15:18:42,087 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-28 15:18:42,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 15:18:42,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-28 15:18:42,089 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 15:18:42,089 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 4 states. [2020-10-28 15:18:42,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 15:18:42,203 INFO L93 Difference]: Finished difference Result 60 states and 73 transitions. [2020-10-28 15:18:42,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-28 15:18:42,204 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 26 [2020-10-28 15:18:42,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 15:18:42,207 INFO L225 Difference]: With dead ends: 60 [2020-10-28 15:18:42,207 INFO L226 Difference]: Without dead ends: 38 [2020-10-28 15:18:42,208 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-28 15:18:42,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-28 15:18:42,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 32. [2020-10-28 15:18:42,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-28 15:18:42,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2020-10-28 15:18:42,220 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2020-10-28 15:18:42,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 15:18:42,221 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2020-10-28 15:18:42,221 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-28 15:18:42,221 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2020-10-28 15:18:42,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-10-28 15:18:42,222 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:42,222 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] [2020-10-28 15:18:42,222 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-28 15:18:42,223 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:42,223 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:42,223 INFO L82 PathProgramCache]: Analyzing trace with hash -607743226, now seen corresponding path program 1 times [2020-10-28 15:18:42,224 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:42,224 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601618825] [2020-10-28 15:18:42,224 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:42,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:42,247 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:42,275 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:42,555 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:42,555 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-28 15:18:42,555 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 15:18:42,556 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 316 [2020-10-28 15:18:42,556 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:42,556 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:42,556 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-28 15:18:42,556 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 16 [2020-10-28 15:18:42,556 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-28 15:18:42,557 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:42,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 15:18:42,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:42,610 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:42,616 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:42,617 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 15:18:42,617 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 15:18:42,617 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 7 [2020-10-28 15:18:42,617 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:42,618 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:42,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:42,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 15:18:42,618 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:42,618 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-28 15:18:42,625 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-28 15:18:42,625 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601618825] [2020-10-28 15:18:42,626 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-28 15:18:42,626 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-28 15:18:42,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825220458] [2020-10-28 15:18:42,627 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-28 15:18:42,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 15:18:42,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-28 15:18:42,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-28 15:18:42,629 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 5 states. [2020-10-28 15:18:42,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 15:18:42,759 INFO L93 Difference]: Finished difference Result 69 states and 84 transitions. [2020-10-28 15:18:42,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-28 15:18:42,760 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 30 [2020-10-28 15:18:42,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 15:18:42,762 INFO L225 Difference]: With dead ends: 69 [2020-10-28 15:18:42,762 INFO L226 Difference]: Without dead ends: 46 [2020-10-28 15:18:42,763 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-28 15:18:42,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-10-28 15:18:42,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 36. [2020-10-28 15:18:42,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-28 15:18:42,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-10-28 15:18:42,772 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2020-10-28 15:18:42,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 15:18:42,773 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-10-28 15:18:42,773 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-28 15:18:42,773 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-10-28 15:18:42,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-28 15:18:42,774 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:42,775 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-10-28 15:18:42,775 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-28 15:18:42,775 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:42,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:42,776 INFO L82 PathProgramCache]: Analyzing trace with hash 726160326, now seen corresponding path program 2 times [2020-10-28 15:18:42,776 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:42,777 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1199249030] [2020-10-28 15:18:42,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:42,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:42,812 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:42,834 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:43,299 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:43,299 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-28 15:18:43,299 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 15:18:43,299 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 499 [2020-10-28 15:18:43,300 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:43,300 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:43,300 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-28 15:18:43,301 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-28 15:18:43,302 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-28 15:18:43,305 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 5 [2020-10-28 15:18:43,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 15:18:43,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:43,387 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:43,390 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:43,391 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 15:18:43,392 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:43,392 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:43,400 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-28 15:18:43,400 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1199249030] [2020-10-28 15:18:43,400 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-28 15:18:43,401 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-28 15:18:43,401 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898727712] [2020-10-28 15:18:43,401 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-28 15:18:43,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 15:18:43,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-28 15:18:43,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-28 15:18:43,403 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 6 states. [2020-10-28 15:18:43,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 15:18:43,555 INFO L93 Difference]: Finished difference Result 79 states and 96 transitions. [2020-10-28 15:18:43,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-28 15:18:43,556 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2020-10-28 15:18:43,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 15:18:43,557 INFO L225 Difference]: With dead ends: 79 [2020-10-28 15:18:43,557 INFO L226 Difference]: Without dead ends: 54 [2020-10-28 15:18:43,558 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-28 15:18:43,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-10-28 15:18:43,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 40. [2020-10-28 15:18:43,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-10-28 15:18:43,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-10-28 15:18:43,567 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2020-10-28 15:18:43,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 15:18:43,567 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-10-28 15:18:43,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-28 15:18:43,568 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-10-28 15:18:43,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-10-28 15:18:43,569 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:43,569 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-10-28 15:18:43,569 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-28 15:18:43,570 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:43,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:43,570 INFO L82 PathProgramCache]: Analyzing trace with hash -486268026, now seen corresponding path program 3 times [2020-10-28 15:18:43,570 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:43,571 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960503112] [2020-10-28 15:18:43,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:43,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:43,599 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:43,625 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:44,428 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:44,428 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 48 [2020-10-28 15:18:44,428 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 15:18:44,429 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 838 [2020-10-28 15:18:44,429 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:44,429 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:44,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-28 15:18:44,429 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-10-28 15:18:44,430 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-28 15:18:44,430 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:44,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 15:18:44,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:44,510 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:44,514 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:44,514 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 15:18:44,515 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 15:18:44,515 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-28 15:18:44,515 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:44,515 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:44,515 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:44,516 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 15:18:44,516 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:44,516 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:44,521 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-28 15:18:44,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960503112] [2020-10-28 15:18:44,522 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-28 15:18:44,522 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-28 15:18:44,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337629877] [2020-10-28 15:18:44,523 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-28 15:18:44,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 15:18:44,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-28 15:18:44,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-28 15:18:44,525 INFO L87 Difference]: Start difference. First operand 40 states and 45 transitions. Second operand 7 states. [2020-10-28 15:18:44,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 15:18:44,674 INFO L93 Difference]: Finished difference Result 89 states and 108 transitions. [2020-10-28 15:18:44,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-28 15:18:44,675 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 38 [2020-10-28 15:18:44,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 15:18:44,676 INFO L225 Difference]: With dead ends: 89 [2020-10-28 15:18:44,676 INFO L226 Difference]: Without dead ends: 62 [2020-10-28 15:18:44,677 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-28 15:18:44,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-10-28 15:18:44,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 44. [2020-10-28 15:18:44,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-10-28 15:18:44,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2020-10-28 15:18:44,686 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 38 [2020-10-28 15:18:44,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 15:18:44,686 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2020-10-28 15:18:44,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-28 15:18:44,686 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2020-10-28 15:18:44,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-10-28 15:18:44,687 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:44,688 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 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] [2020-10-28 15:18:44,688 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-28 15:18:44,688 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:44,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:44,688 INFO L82 PathProgramCache]: Analyzing trace with hash 687522374, now seen corresponding path program 4 times [2020-10-28 15:18:44,689 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:44,689 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087904955] [2020-10-28 15:18:44,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:44,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:44,720 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:44,746 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:45,910 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:45,910 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 52 [2020-10-28 15:18:45,910 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-28 15:18:45,911 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1201 [2020-10-28 15:18:45,911 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:45,911 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:45,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-28 15:18:45,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-28 15:18:45,911 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-28 15:18:45,912 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-28 15:18:45,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-28 15:18:46,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-28 15:18:46,003 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-28 15:18:46,006 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-28 15:18:46,007 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-28 15:18:46,007 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-28 15:18:46,007 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-28 15:18:46,007 FATAL L256 erpolLogProxyWrapper]: Heuristic: WIDESTAMONGSMALL [2020-10-28 15:18:46,007 FATAL L256 erpolLogProxyWrapper]: Tolerance: 0.6 [2020-10-28 15:18:46,007 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-28 15:18:46,008 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-28 15:18:46,008 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-28 15:18:46,010 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 2 [2020-10-28 15:18:46,016 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-28 15:18:46,017 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087904955] [2020-10-28 15:18:46,021 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-28 15:18:46,021 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-28 15:18:46,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996250540] [2020-10-28 15:18:46,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-28 15:18:46,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-28 15:18:46,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-28 15:18:46,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-28 15:18:46,024 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 8 states. [2020-10-28 15:18:46,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-28 15:18:46,209 INFO L93 Difference]: Finished difference Result 97 states and 118 transitions. [2020-10-28 15:18:46,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-28 15:18:46,209 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2020-10-28 15:18:46,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-28 15:18:46,210 INFO L225 Difference]: With dead ends: 97 [2020-10-28 15:18:46,210 INFO L226 Difference]: Without dead ends: 68 [2020-10-28 15:18:46,211 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-28 15:18:46,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-10-28 15:18:46,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 48. [2020-10-28 15:18:46,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-10-28 15:18:46,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-10-28 15:18:46,220 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 42 [2020-10-28 15:18:46,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-28 15:18:46,220 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-10-28 15:18:46,220 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-28 15:18:46,220 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-10-28 15:18:46,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-28 15:18:46,222 INFO L414 BasicCegarLoop]: Found error trace [2020-10-28 15:18:46,222 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 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] [2020-10-28 15:18:46,222 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-28 15:18:46,222 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-28 15:18:46,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-28 15:18:46,223 INFO L82 PathProgramCache]: Analyzing trace with hash 1304227846, now seen corresponding path program 5 times [2020-10-28 15:18:46,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-28 15:18:46,226 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936506218] [2020-10-28 15:18:46,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-28 15:18:46,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-28 15:18:46,257 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-28 15:18:46,257 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-28 15:18:46,262 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-28 15:18:46,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.10 03:18:46 BoogieIcfgContainer [2020-10-28 15:18:46,291 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-28 15:18:46,296 INFO L168 Benchmark]: Toolchain (without parser) took 6819.43 ms. Allocated memory was 125.8 MB in the beginning and 198.2 MB in the end (delta: 72.4 MB). Free memory was 101.0 MB in the beginning and 66.7 MB in the end (delta: 34.3 MB). Peak memory consumption was 107.9 MB. Max. memory is 8.0 GB. [2020-10-28 15:18:46,298 INFO L168 Benchmark]: CDTParser took 0.73 ms. Allocated memory is still 125.8 MB. Free memory is still 85.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-28 15:18:46,305 INFO L168 Benchmark]: CACSL2BoogieTranslator took 340.89 ms. Allocated memory is still 125.8 MB. Free memory was 100.3 MB in the beginning and 90.2 MB in the end (delta: 10.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-10-28 15:18:46,306 INFO L168 Benchmark]: Boogie Preprocessor took 46.19 ms. Allocated memory is still 125.8 MB. Free memory was 90.2 MB in the beginning and 88.5 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-28 15:18:46,307 INFO L168 Benchmark]: RCFGBuilder took 500.79 ms. Allocated memory was 125.8 MB in the beginning and 164.6 MB in the end (delta: 38.8 MB). Free memory was 88.3 MB in the beginning and 144.3 MB in the end (delta: -56.0 MB). Peak memory consumption was 21.9 MB. Max. memory is 8.0 GB. [2020-10-28 15:18:46,308 INFO L168 Benchmark]: TraceAbstraction took 5915.77 ms. Allocated memory was 164.6 MB in the beginning and 198.2 MB in the end (delta: 33.6 MB). Free memory was 143.9 MB in the beginning and 66.7 MB in the end (delta: 77.2 MB). Peak memory consumption was 111.1 MB. Max. memory is 8.0 GB. [2020-10-28 15:18:46,321 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.73 ms. Allocated memory is still 125.8 MB. Free memory is still 85.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 340.89 ms. Allocated memory is still 125.8 MB. Free memory was 100.3 MB in the beginning and 90.2 MB in the end (delta: 10.2 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 46.19 ms. Allocated memory is still 125.8 MB. Free memory was 90.2 MB in the beginning and 88.5 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 500.79 ms. Allocated memory was 125.8 MB in the beginning and 164.6 MB in the end (delta: 38.8 MB). Free memory was 88.3 MB in the beginning and 144.3 MB in the end (delta: -56.0 MB). Peak memory consumption was 21.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5915.77 ms. Allocated memory was 164.6 MB in the beginning and 198.2 MB in the end (delta: 33.6 MB). Free memory was 143.9 MB in the beginning and 66.7 MB in the end (delta: 77.2 MB). Peak memory consumption was 111.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)<