/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --rcfgbuilder.size.of.a.code.block SequenceOfStatements --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options produce-proofs=true --traceabstraction.additional.smt.options produce-unsat-cores=true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true --traceabstraction.additional.smt.options unknown-allowed=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 16:25:21,369 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 16:25:21,372 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 16:25:21,413 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 16:25:21,414 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 16:25:21,425 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 16:25:21,427 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 16:25:21,430 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 16:25:21,433 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 16:25:21,436 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 16:25:21,437 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 16:25:21,438 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 16:25:21,438 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 16:25:21,441 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 16:25:21,443 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 16:25:21,445 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 16:25:21,446 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 16:25:21,447 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 16:25:21,449 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 16:25:21,450 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 16:25:21,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 16:25:21,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 16:25:21,454 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 16:25:21,454 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 16:25:21,457 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 16:25:21,457 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 16:25:21,457 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 16:25:21,458 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 16:25:21,458 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 16:25:21,459 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 16:25:21,459 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 16:25:21,460 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 16:25:21,461 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 16:25:21,461 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 16:25:21,462 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 16:25:21,463 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 16:25:21,463 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 16:25:21,463 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 16:25:21,464 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 16:25:21,464 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 16:25:21,465 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 16:25:21,466 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 [2020-10-12 16:25:21,493 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 16:25:21,493 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 16:25:21,494 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 16:25:21,494 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 16:25:21,494 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 16:25:21,495 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 16:25:21,495 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 16:25:21,495 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 16:25:21,495 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 16:25:21,495 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 16:25:21,495 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 16:25:21,495 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 16:25:21,496 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 16:25:21,496 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 16:25:21,496 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 16:25:21,496 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 16:25:21,496 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 16:25:21,497 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 16:25:21,497 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 16:25:21,497 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 16:25:21,497 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 16:25:21,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 16:25:21,497 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 16:25:21,498 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 16:25:21,498 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 16:25:21,498 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 16:25:21,498 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 16:25:21,498 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 16:25:21,499 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 16:25:21,499 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> SequenceOfStatements Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> produce-proofs=true;produce-unsat-cores=true;enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true;unknown-allowed=true; [2020-10-12 16:25:21,789 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 16:25:21,802 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 16:25:21,805 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 16:25:21,807 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 16:25:21,807 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 16:25:21,808 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-10-12 16:25:21,869 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/284d16e4d/e308520bee9345fe89c77f7fd9bdfed3/FLAGcccd27543 [2020-10-12 16:25:22,298 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 16:25:22,299 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-2.i [2020-10-12 16:25:22,306 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/284d16e4d/e308520bee9345fe89c77f7fd9bdfed3/FLAGcccd27543 [2020-10-12 16:25:22,650 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/284d16e4d/e308520bee9345fe89c77f7fd9bdfed3 [2020-10-12 16:25:22,661 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 16:25:22,663 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 16:25:22,664 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 16:25:22,664 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 16:25:22,668 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 16:25:22,669 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:25:22" (1/1) ... [2020-10-12 16:25:22,672 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23b1b478 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:22, skipping insertion in model container [2020-10-12 16:25:22,672 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:25:22" (1/1) ... [2020-10-12 16:25:22,680 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 16:25:22,699 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 16:25:22,882 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:25:22,886 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 16:25:22,913 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:25:23,013 INFO L208 MainTranslator]: Completed translation [2020-10-12 16:25:23,013 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23 WrapperNode [2020-10-12 16:25:23,014 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 16:25:23,014 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 16:25:23,014 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 16:25:23,015 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 16:25:23,028 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,028 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,042 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,043 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,054 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,062 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (1/1) ... [2020-10-12 16:25:23,065 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 16:25:23,066 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 16:25:23,066 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 16:25:23,066 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 16:25:23,067 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (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 [2020-10-12 16:25:23,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 16:25:23,130 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 16:25:23,130 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-12 16:25:23,130 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-12 16:25:23,130 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 16:25:23,130 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 16:25:23,130 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-12 16:25:23,131 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-12 16:25:23,131 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-12 16:25:23,131 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-10-12 16:25:23,131 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 16:25:23,131 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-12 16:25:23,131 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-12 16:25:23,132 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-12 16:25:23,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-12 16:25:23,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 16:25:23,132 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 16:25:23,429 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 16:25:23,430 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-10-12 16:25:23,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:25:23 BoogieIcfgContainer [2020-10-12 16:25:23,436 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 16:25:23,438 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 16:25:23,438 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 16:25:23,441 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 16:25:23,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 04:25:22" (1/3) ... [2020-10-12 16:25:23,443 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c941109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:25:23, skipping insertion in model container [2020-10-12 16:25:23,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:25:23" (2/3) ... [2020-10-12 16:25:23,443 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c941109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:25:23, skipping insertion in model container [2020-10-12 16:25:23,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:25:23" (3/3) ... [2020-10-12 16:25:23,445 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-10-12 16:25:23,459 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 16:25:23,468 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-12 16:25:23,486 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-12 16:25:23,516 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 16:25:23,517 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 16:25:23,517 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 16:25:23,517 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 16:25:23,517 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 16:25:23,518 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 16:25:23,518 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 16:25:23,518 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 16:25:23,539 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-10-12 16:25:23,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-12 16:25:23,546 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:25:23,547 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] [2020-10-12 16:25:23,548 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:25:23,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:25:23,555 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-10-12 16:25:23,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:25:23,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173902987] [2020-10-12 16:25:23,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:25:23,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:23,728 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:23,761 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:23,786 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:23,810 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:23,834 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:24,126 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:24,126 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 30 [2020-10-12 16:25:24,127 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 5 [2020-10-12 16:25:24,127 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 421 [2020-10-12 16:25:24,130 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:24,130 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 2 [2020-10-12 16:25:24,130 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:25:24,131 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 2 [2020-10-12 16:25:24,131 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-12 16:25:24,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:25:24,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:24,194 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:24,197 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:24,197 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:25:24,198 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:25:24,198 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 4 [2020-10-12 16:25:24,200 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:24,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:25:24,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:25:24,201 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:25:24,202 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:24,209 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:25:24,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173902987] [2020-10-12 16:25:24,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:25:24,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-12 16:25:24,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161792629] [2020-10-12 16:25:24,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-12 16:25:24,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:25:24,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-12 16:25:24,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-10-12 16:25:24,236 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-10-12 16:25:24,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:25:24,422 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-10-12 16:25:24,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-12 16:25:24,425 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-10-12 16:25:24,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:25:24,437 INFO L225 Difference]: With dead ends: 73 [2020-10-12 16:25:24,437 INFO L226 Difference]: Without dead ends: 36 [2020-10-12 16:25:24,441 INFO L675 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 [2020-10-12 16:25:24,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-12 16:25:24,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-10-12 16:25:24,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-12 16:25:24,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-10-12 16:25:24,487 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-10-12 16:25:24,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:25:24,487 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-10-12 16:25:24,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-12 16:25:24,488 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-10-12 16:25:24,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-12 16:25:24,489 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:25:24,489 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] [2020-10-12 16:25:24,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 16:25:24,490 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:25:24,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:25:24,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-10-12 16:25:24,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:25:24,492 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949148999] [2020-10-12 16:25:24,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:25:24,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:24,512 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:24,530 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:24,883 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:24,883 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 36 [2020-10-12 16:25:24,884 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:25:24,884 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 377 [2020-10-12 16:25:24,884 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:24,885 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 3 [2020-10-12 16:25:24,885 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:25:24,885 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-12 16:25:24,886 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:24,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:25:24,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:24,947 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:24,950 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:24,950 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:25:24,950 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:25:24,951 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-12 16:25:24,951 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:24,952 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:25:24,952 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:25:24,952 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:25:24,953 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:24,959 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 16:25:24,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949148999] [2020-10-12 16:25:24,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:25:24,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-10-12 16:25:24,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061064799] [2020-10-12 16:25:24,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-12 16:25:24,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:25:24,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-12 16:25:24,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-10-12 16:25:24,975 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-10-12 16:25:25,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:25:25,109 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-10-12 16:25:25,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-12 16:25:25,110 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-10-12 16:25:25,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:25:25,111 INFO L225 Difference]: With dead ends: 65 [2020-10-12 16:25:25,111 INFO L226 Difference]: Without dead ends: 44 [2020-10-12 16:25:25,113 INFO L675 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 [2020-10-12 16:25:25,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-12 16:25:25,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-10-12 16:25:25,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-12 16:25:25,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-10-12 16:25:25,121 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-10-12 16:25:25,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:25:25,121 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-10-12 16:25:25,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-12 16:25:25,121 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-10-12 16:25:25,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-12 16:25:25,123 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:25:25,123 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] [2020-10-12 16:25:25,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 16:25:25,123 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:25:25,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:25:25,124 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-10-12 16:25:25,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:25:25,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817300750] [2020-10-12 16:25:25,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:25:25,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:25,143 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:25,163 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:25,536 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:25,537 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 40 [2020-10-12 16:25:25,537 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:25:25,538 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 399 [2020-10-12 16:25:25,538 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:25,538 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 16:25:25,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 11 [2020-10-12 16:25:25,539 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 6 [2020-10-12 16:25:25,539 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:25,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:25:25,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:25,584 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:25,585 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:25,586 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:25:25,586 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:25:25,586 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:25:25,587 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:25,587 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:25:25,587 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:25:25,587 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:25:25,588 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:25,591 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-12 16:25:25,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817300750] [2020-10-12 16:25:25,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:25:25,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-12 16:25:25,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778429213] [2020-10-12 16:25:25,593 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-12 16:25:25,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:25:25,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-12 16:25:25,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-10-12 16:25:25,594 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-10-12 16:25:25,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:25:25,725 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-10-12 16:25:25,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-12 16:25:25,726 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-10-12 16:25:25,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:25:25,727 INFO L225 Difference]: With dead ends: 75 [2020-10-12 16:25:25,727 INFO L226 Difference]: Without dead ends: 52 [2020-10-12 16:25:25,728 INFO L675 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 [2020-10-12 16:25:25,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-10-12 16:25:25,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-10-12 16:25:25,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-12 16:25:25,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-10-12 16:25:25,736 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-10-12 16:25:25,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:25:25,737 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-10-12 16:25:25,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-12 16:25:25,737 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-10-12 16:25:25,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-12 16:25:25,738 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:25:25,739 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] [2020-10-12 16:25:25,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-12 16:25:25,739 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:25:25,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:25:25,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-10-12 16:25:25,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:25:25,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156239088] [2020-10-12 16:25:25,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:25:25,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:25,759 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:25,791 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:26,223 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:26,223 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 44 [2020-10-12 16:25:26,223 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:25:26,224 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 469 [2020-10-12 16:25:26,224 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:26,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 5 [2020-10-12 16:25:26,224 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 20 [2020-10-12 16:25:26,225 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-12 16:25:26,225 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:25:26,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:25:26,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:26,273 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:26,274 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:26,274 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:25:26,274 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:25:26,275 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:25:26,275 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:26,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:25:26,275 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:25:26,276 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:25:26,276 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:25:26,279 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-12 16:25:26,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156239088] [2020-10-12 16:25:26,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:25:26,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-10-12 16:25:26,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171642249] [2020-10-12 16:25:26,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 16:25:26,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:25:26,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 16:25:26,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-10-12 16:25:26,281 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-10-12 16:25:26,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:25:26,474 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-10-12 16:25:26,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-12 16:25:26,474 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-10-12 16:25:26,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:25:26,475 INFO L225 Difference]: With dead ends: 85 [2020-10-12 16:25:26,475 INFO L226 Difference]: Without dead ends: 60 [2020-10-12 16:25:26,476 INFO L675 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 [2020-10-12 16:25:26,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-10-12 16:25:26,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-10-12 16:25:26,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-10-12 16:25:26,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-10-12 16:25:26,484 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-10-12 16:25:26,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:25:26,484 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-10-12 16:25:26,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 16:25:26,485 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-10-12 16:25:26,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-12 16:25:26,486 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:25:26,486 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] [2020-10-12 16:25:26,487 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-12 16:25:26,487 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:25:26,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:25:26,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-10-12 16:25:26,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:25:26,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2098732993] [2020-10-12 16:25:26,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:25:26,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:26,509 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:26,526 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:27,335 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:27,336 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 48 [2020-10-12 16:25:27,336 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:25:27,337 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 832 [2020-10-12 16:25:27,337 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:27,337 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 16:25:27,337 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 22 [2020-10-12 16:25:27,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 10 [2020-10-12 16:25:27,338 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:27,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:25:27,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:25:27,412 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:25:27,413 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:25:27,413 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 8 [2020-10-12 16:25:27,413 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:25:27,414 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:25:27,414 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:25:27,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:25:27,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:25:27,415 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:25:27,415 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:25:27,419 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-12 16:25:27,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2098732993] [2020-10-12 16:25:27,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:25:27,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-12 16:25:27,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819714754] [2020-10-12 16:25:27,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-12 16:25:27,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:25:27,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-12 16:25:27,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-10-12 16:25:27,423 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-10-12 16:25:27,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:25:27,616 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-10-12 16:25:27,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-12 16:25:27,616 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-10-12 16:25:27,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:25:27,617 INFO L225 Difference]: With dead ends: 93 [2020-10-12 16:25:27,617 INFO L226 Difference]: Without dead ends: 66 [2020-10-12 16:25:27,618 INFO L675 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 [2020-10-12 16:25:27,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-10-12 16:25:27,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-10-12 16:25:27,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-12 16:25:27,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-10-12 16:25:27,624 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-10-12 16:25:27,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:25:27,625 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-10-12 16:25:27,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-12 16:25:27,625 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-10-12 16:25:27,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-10-12 16:25:27,626 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:25:27,627 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] [2020-10-12 16:25:27,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-12 16:25:27,627 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:25:27,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:25:27,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-10-12 16:25:27,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:25:27,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414840190] [2020-10-12 16:25:27,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:25:27,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-12 16:25:27,646 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-12 16:25:27,646 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-10-12 16:25:27,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-12 16:25:27,671 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.10 04:25:27 BoogieIcfgContainer [2020-10-12 16:25:27,671 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-12 16:25:27,674 INFO L168 Benchmark]: Toolchain (without parser) took 5010.97 ms. Allocated memory was 138.9 MB in the beginning and 293.6 MB in the end (delta: 154.7 MB). Free memory was 102.4 MB in the beginning and 176.7 MB in the end (delta: -74.3 MB). Peak memory consumption was 80.3 MB. Max. memory is 7.1 GB. [2020-10-12 16:25:27,675 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-10-12 16:25:27,676 INFO L168 Benchmark]: CACSL2BoogieTranslator took 350.09 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 102.1 MB in the beginning and 180.7 MB in the end (delta: -78.6 MB). Peak memory consumption was 22.9 MB. Max. memory is 7.1 GB. [2020-10-12 16:25:27,677 INFO L168 Benchmark]: Boogie Preprocessor took 50.98 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 178.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. [2020-10-12 16:25:27,678 INFO L168 Benchmark]: RCFGBuilder took 371.02 ms. Allocated memory is still 201.9 MB. Free memory was 178.2 MB in the beginning and 158.9 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. [2020-10-12 16:25:27,679 INFO L168 Benchmark]: TraceAbstraction took 4233.42 ms. Allocated memory was 201.9 MB in the beginning and 293.6 MB in the end (delta: 91.8 MB). Free memory was 158.2 MB in the beginning and 176.7 MB in the end (delta: -18.5 MB). Peak memory consumption was 73.2 MB. Max. memory is 7.1 GB. [2020-10-12 16:25:27,682 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 350.09 ms. Allocated memory was 138.9 MB in the beginning and 201.9 MB in the end (delta: 62.9 MB). Free memory was 102.1 MB in the beginning and 180.7 MB in the end (delta: -78.6 MB). Peak memory consumption was 22.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 50.98 ms. Allocated memory is still 201.9 MB. Free memory was 180.7 MB in the beginning and 178.2 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 371.02 ms. Allocated memory is still 201.9 MB. Free memory was 178.2 MB in the beginning and 158.9 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4233.42 ms. Allocated memory was 201.9 MB in the beginning and 293.6 MB in the end (delta: 91.8 MB). Free memory was 158.2 MB in the beginning and 176.7 MB in the end (delta: -18.5 MB). Peak memory consumption was 73.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ [L24] COND FALSE !(i<5) [L26] EXPR string_A[5 -1] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ [L28] COND FALSE !(i<5) [L30] EXPR string_B[5 -1] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 [L33] EXPR string_A[nc_A] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 [L37] EXPR string_B[nc_B] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 [L44] COND FALSE !((inc_B-1)<