/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/loop-new/half.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-adbd35c [2020-10-12 16:09:44,758 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-12 16:09:44,761 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-12 16:09:44,805 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-12 16:09:44,806 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-12 16:09:44,814 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-12 16:09:44,815 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-12 16:09:44,818 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-12 16:09:44,820 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-12 16:09:44,823 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-12 16:09:44,824 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-12 16:09:44,826 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-12 16:09:44,827 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-12 16:09:44,829 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-12 16:09:44,832 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-12 16:09:44,835 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-12 16:09:44,836 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-12 16:09:44,838 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-12 16:09:44,839 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-12 16:09:44,849 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-12 16:09:44,852 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-12 16:09:44,853 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-12 16:09:44,854 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-12 16:09:44,855 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-12 16:09:44,867 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-12 16:09:44,867 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-12 16:09:44,868 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-12 16:09:44,869 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-12 16:09:44,871 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-12 16:09:44,872 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-12 16:09:44,872 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-12 16:09:44,873 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-12 16:09:44,874 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-12 16:09:44,875 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-12 16:09:44,876 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-12 16:09:44,876 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-12 16:09:44,877 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-12 16:09:44,877 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-12 16:09:44,877 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-12 16:09:44,878 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-12 16:09:44,879 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-12 16:09:44,880 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 16:09:44,902 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-12 16:09:44,902 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-12 16:09:44,903 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-12 16:09:44,903 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-12 16:09:44,904 INFO L138 SettingsManager]: * Use SBE=true [2020-10-12 16:09:44,904 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-12 16:09:44,904 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-12 16:09:44,904 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-12 16:09:44,905 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-12 16:09:44,905 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-12 16:09:44,905 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-12 16:09:44,905 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-12 16:09:44,905 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-12 16:09:44,906 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-12 16:09:44,906 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-12 16:09:44,906 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-12 16:09:44,906 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-12 16:09:44,906 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-12 16:09:44,906 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-12 16:09:44,907 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-12 16:09:44,907 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-12 16:09:44,907 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-12 16:09:44,907 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-12 16:09:44,908 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-12 16:09:44,908 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-12 16:09:44,908 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-12 16:09:44,908 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-12 16:09:44,908 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-12 16:09:44,909 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-12 16:09:44,909 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 16:09:45,246 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-12 16:09:45,260 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-12 16:09:45,269 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-12 16:09:45,271 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-12 16:09:45,272 INFO L275 PluginConnector]: CDTParser initialized [2020-10-12 16:09:45,272 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-new/half.i [2020-10-12 16:09:45,336 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/98baba6e3/3026066f6ff6423bb2ce947400fc8dd3/FLAG291be9492 [2020-10-12 16:09:45,786 INFO L306 CDTParser]: Found 1 translation units. [2020-10-12 16:09:45,787 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-new/half.i [2020-10-12 16:09:45,793 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/98baba6e3/3026066f6ff6423bb2ce947400fc8dd3/FLAG291be9492 [2020-10-12 16:09:46,206 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/98baba6e3/3026066f6ff6423bb2ce947400fc8dd3 [2020-10-12 16:09:46,215 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-12 16:09:46,216 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-12 16:09:46,218 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-12 16:09:46,218 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-12 16:09:46,221 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-12 16:09:46,223 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,226 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@724e5b71 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46, skipping insertion in model container [2020-10-12 16:09:46,226 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,234 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-12 16:09:46,256 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-12 16:09:46,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:09:46,431 INFO L203 MainTranslator]: Completed pre-run [2020-10-12 16:09:46,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-12 16:09:46,459 INFO L208 MainTranslator]: Completed translation [2020-10-12 16:09:46,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46 WrapperNode [2020-10-12 16:09:46,459 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-12 16:09:46,460 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-12 16:09:46,460 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-12 16:09:46,460 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-12 16:09:46,470 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,470 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,548 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,548 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,553 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,558 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,564 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (1/1) ... [2020-10-12 16:09:46,565 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-12 16:09:46,566 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-12 16:09:46,566 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-12 16:09:46,566 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-12 16:09:46,567 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (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 16:09:46,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-12 16:09:46,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-12 16:09:46,624 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-10-12 16:09:46,625 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-10-12 16:09:46,625 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-12 16:09:46,625 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-10-12 16:09:46,625 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-12 16:09:46,625 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-10-12 16:09:46,625 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-10-12 16:09:46,625 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-12 16:09:46,626 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-12 16:09:46,626 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-12 16:09:46,626 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-12 16:09:46,823 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-12 16:09:46,823 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-10-12 16:09:46,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:09:46 BoogieIcfgContainer [2020-10-12 16:09:46,827 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-12 16:09:46,829 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-12 16:09:46,829 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-12 16:09:46,832 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-12 16:09:46,833 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.10 04:09:46" (1/3) ... [2020-10-12 16:09:46,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ea59d38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:09:46, skipping insertion in model container [2020-10-12 16:09:46,834 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.10 04:09:46" (2/3) ... [2020-10-12 16:09:46,834 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ea59d38 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.10 04:09:46, skipping insertion in model container [2020-10-12 16:09:46,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.10 04:09:46" (3/3) ... [2020-10-12 16:09:46,836 INFO L109 eAbstractionObserver]: Analyzing ICFG half.i [2020-10-12 16:09:46,847 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-12 16:09:46,854 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-12 16:09:46,869 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-12 16:09:46,894 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-10-12 16:09:46,894 INFO L376 AbstractCegarLoop]: Hoare is true [2020-10-12 16:09:46,895 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-10-12 16:09:46,895 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-12 16:09:46,895 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-12 16:09:46,895 INFO L380 AbstractCegarLoop]: Difference is false [2020-10-12 16:09:46,895 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-12 16:09:46,895 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-12 16:09:46,912 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-10-12 16:09:46,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-12 16:09:46,918 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:46,919 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:46,920 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:46,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:46,925 INFO L82 PathProgramCache]: Analyzing trace with hash -961315073, now seen corresponding path program 1 times [2020-10-12 16:09:46,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:46,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937538501] [2020-10-12 16:09:46,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:47,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:47,039 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:47,082 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:47,083 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-10-12 16:09:47,083 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:47,083 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 54 [2020-10-12 16:09:47,085 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:47,085 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:47,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:09:47,086 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:47,086 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 3 [2020-10-12 16:09:47,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:47,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:47,113 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:47,116 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:47,116 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:47,116 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:47,117 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-12 16:09:47,117 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:47,117 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:47,117 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:47,118 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:47,118 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:47,124 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 16:09:47,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937538501] [2020-10-12 16:09:47,127 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:09:47,127 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-12 16:09:47,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513130558] [2020-10-12 16:09:47,135 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-12 16:09:47,135 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:47,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-12 16:09:47,152 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-12 16:09:47,154 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-10-12 16:09:47,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:47,180 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2020-10-12 16:09:47,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-12 16:09:47,182 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-10-12 16:09:47,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:47,191 INFO L225 Difference]: With dead ends: 33 [2020-10-12 16:09:47,191 INFO L226 Difference]: Without dead ends: 14 [2020-10-12 16:09:47,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-12 16:09:47,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-10-12 16:09:47,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-10-12 16:09:47,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-10-12 16:09:47,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-10-12 16:09:47,239 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 11 [2020-10-12 16:09:47,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:47,239 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-10-12 16:09:47,240 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-12 16:09:47,240 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-10-12 16:09:47,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-10-12 16:09:47,241 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:47,241 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:47,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-12 16:09:47,242 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:47,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:47,242 INFO L82 PathProgramCache]: Analyzing trace with hash -971473804, now seen corresponding path program 1 times [2020-10-12 16:09:47,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:47,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851984936] [2020-10-12 16:09:47,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:47,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:47,277 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:47,408 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:47,409 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 19 [2020-10-12 16:09:47,409 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:47,409 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 148 [2020-10-12 16:09:47,409 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:47,410 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 16:09:47,413 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-12 16:09:47,414 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 8 [2020-10-12 16:09:47,414 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 4 [2020-10-12 16:09:47,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:47,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:47,581 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:47,583 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:47,584 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:47,584 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:47,585 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 3 [2020-10-12 16:09:47,585 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:47,585 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:47,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:47,586 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:47,586 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:47,591 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 16:09:47,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851984936] [2020-10-12 16:09:47,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:09:47,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-12 16:09:47,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27755057] [2020-10-12 16:09:47,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-12 16:09:47,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:47,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-12 16:09:47,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-10-12 16:09:47,597 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 7 states. [2020-10-12 16:09:47,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:47,769 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2020-10-12 16:09:47,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-12 16:09:47,770 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2020-10-12 16:09:47,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:47,773 INFO L225 Difference]: With dead ends: 26 [2020-10-12 16:09:47,774 INFO L226 Difference]: Without dead ends: 21 [2020-10-12 16:09:47,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-10-12 16:09:47,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-12 16:09:47,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 15. [2020-10-12 16:09:47,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-12 16:09:47,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-10-12 16:09:47,782 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2020-10-12 16:09:47,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:47,782 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-10-12 16:09:47,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-12 16:09:47,782 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-10-12 16:09:47,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-12 16:09:47,783 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:47,783 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:47,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-12 16:09:47,784 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:47,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:47,784 INFO L82 PathProgramCache]: Analyzing trace with hash -18708286, now seen corresponding path program 1 times [2020-10-12 16:09:47,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:47,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1155221170] [2020-10-12 16:09:47,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:47,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:47,807 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:47,901 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,017 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:48,018 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-12 16:09:48,018 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:09:48,019 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 218 [2020-10-12 16:09:48,020 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:48,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 4 [2020-10-12 16:09:48,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 12 [2020-10-12 16:09:48,020 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 4 [2020-10-12 16:09:48,021 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:48,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:48,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:48,089 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,090 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:48,090 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:48,090 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:48,091 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 2 [2020-10-12 16:09:48,091 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:48,091 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:48,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:48,092 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:48,092 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:48,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:09:48,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1155221170] [2020-10-12 16:09:48,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-12 16:09:48,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-10-12 16:09:48,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651977689] [2020-10-12 16:09:48,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-12 16:09:48,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:48,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-12 16:09:48,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-12 16:09:48,100 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2020-10-12 16:09:48,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:48,168 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-10-12 16:09:48,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-12 16:09:48,169 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2020-10-12 16:09:48,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:48,170 INFO L225 Difference]: With dead ends: 22 [2020-10-12 16:09:48,170 INFO L226 Difference]: Without dead ends: 17 [2020-10-12 16:09:48,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-12 16:09:48,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-10-12 16:09:48,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2020-10-12 16:09:48,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-10-12 16:09:48,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2020-10-12 16:09:48,177 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2020-10-12 16:09:48,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:48,177 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2020-10-12 16:09:48,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-12 16:09:48,177 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2020-10-12 16:09:48,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-10-12 16:09:48,178 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:48,178 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:48,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-12 16:09:48,179 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:48,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:48,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1756299076, now seen corresponding path program 1 times [2020-10-12 16:09:48,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:48,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771727119] [2020-10-12 16:09:48,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:48,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:48,196 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,220 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,246 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,349 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:48,349 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 22 [2020-10-12 16:09:48,349 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 3 [2020-10-12 16:09:48,350 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 158 [2020-10-12 16:09:48,350 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:48,350 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 7 [2020-10-12 16:09:48,350 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-12 16:09:48,351 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 11 [2020-10-12 16:09:48,351 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:09:48,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:48,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:48,499 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,500 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:48,500 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:48,500 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:48,501 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:09:48,501 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:48,501 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:48,501 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:48,502 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:48,502 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:09:48,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:09:48,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771727119] [2020-10-12 16:09:48,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:09:48,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-10-12 16:09:48,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763041192] [2020-10-12 16:09:48,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-12 16:09:48,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:48,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-12 16:09:48,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-10-12 16:09:48,518 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 8 states. [2020-10-12 16:09:48,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:48,695 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-10-12 16:09:48,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-12 16:09:48,696 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-10-12 16:09:48,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:48,697 INFO L225 Difference]: With dead ends: 31 [2020-10-12 16:09:48,697 INFO L226 Difference]: Without dead ends: 26 [2020-10-12 16:09:48,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-10-12 16:09:48,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-12 16:09:48,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 18. [2020-10-12 16:09:48,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-12 16:09:48,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-10-12 16:09:48,708 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2020-10-12 16:09:48,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:48,713 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-10-12 16:09:48,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-12 16:09:48,713 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-10-12 16:09:48,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-10-12 16:09:48,714 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:48,715 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:48,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-10-12 16:09:48,716 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:48,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:48,717 INFO L82 PathProgramCache]: Analyzing trace with hash 154986550, now seen corresponding path program 1 times [2020-10-12 16:09:48,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:48,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635857006] [2020-10-12 16:09:48,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:48,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:48,750 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:48,798 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,074 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:49,075 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 25 [2020-10-12 16:09:49,075 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:09:49,075 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 336 [2020-10-12 16:09:49,076 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:49,076 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 10 [2020-10-12 16:09:49,076 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-12 16:09:49,076 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 14 [2020-10-12 16:09:49,077 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:09:49,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:49,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:49,336 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,337 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:49,337 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:49,337 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:49,337 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:09:49,338 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:49,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:49,338 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:49,339 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:49,339 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:49,342 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:09:49,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635857006] [2020-10-12 16:09:49,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:09:49,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-10-12 16:09:49,344 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232709795] [2020-10-12 16:09:49,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-12 16:09:49,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:49,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-12 16:09:49,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-10-12 16:09:49,346 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 11 states. [2020-10-12 16:09:49,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:49,525 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2020-10-12 16:09:49,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-12 16:09:49,526 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 17 [2020-10-12 16:09:49,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:49,527 INFO L225 Difference]: With dead ends: 37 [2020-10-12 16:09:49,527 INFO L226 Difference]: Without dead ends: 24 [2020-10-12 16:09:49,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2020-10-12 16:09:49,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-12 16:09:49,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2020-10-12 16:09:49,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-12 16:09:49,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-10-12 16:09:49,538 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 17 [2020-10-12 16:09:49,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:49,538 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-10-12 16:09:49,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-12 16:09:49,539 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-10-12 16:09:49,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-12 16:09:49,540 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:49,541 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:49,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-10-12 16:09:49,541 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:49,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:49,542 INFO L82 PathProgramCache]: Analyzing trace with hash -344718844, now seen corresponding path program 2 times [2020-10-12 16:09:49,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:49,542 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011761699] [2020-10-12 16:09:49,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:49,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:49,558 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,595 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,609 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,626 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,721 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:49,767 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:50,024 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:50,025 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 28 [2020-10-12 16:09:50,025 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 6 [2020-10-12 16:09:50,025 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 471 [2020-10-12 16:09:50,026 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:50,026 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 6 [2020-10-12 16:09:50,026 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 13 [2020-10-12 16:09:50,026 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 9 [2020-10-12 16:09:50,027 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:50,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:50,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:50,093 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:50,094 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:50,094 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:50,094 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:50,095 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:09:50,095 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:50,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:50,095 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:50,096 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:50,096 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 1 [2020-10-12 16:09:50,099 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-12 16:09:50,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011761699] [2020-10-12 16:09:50,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:09:50,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-10-12 16:09:50,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378092424] [2020-10-12 16:09:50,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-12 16:09:50,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:50,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-12 16:09:50,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-10-12 16:09:50,107 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 6 states. [2020-10-12 16:09:50,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:50,176 INFO L93 Difference]: Finished difference Result 38 states and 44 transitions. [2020-10-12 16:09:50,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-12 16:09:50,177 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-10-12 16:09:50,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:50,178 INFO L225 Difference]: With dead ends: 38 [2020-10-12 16:09:50,178 INFO L226 Difference]: Without dead ends: 25 [2020-10-12 16:09:50,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-10-12 16:09:50,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-10-12 16:09:50,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2020-10-12 16:09:50,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-12 16:09:50,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-10-12 16:09:50,194 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2020-10-12 16:09:50,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:50,195 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-10-12 16:09:50,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-12 16:09:50,196 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-10-12 16:09:50,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-10-12 16:09:50,197 INFO L414 BasicCegarLoop]: Found error trace [2020-10-12 16:09:50,197 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-12 16:09:50,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-12 16:09:50,198 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-12 16:09:50,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-12 16:09:50,199 INFO L82 PathProgramCache]: Analyzing trace with hash -1298269576, now seen corresponding path program 3 times [2020-10-12 16:09:50,199 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-12 16:09:50,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626632504] [2020-10-12 16:09:50,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-12 16:09:50,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:50,221 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:50,303 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:50,588 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:50,589 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 31 [2020-10-12 16:09:50,589 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 2 [2020-10-12 16:09:50,589 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 373 [2020-10-12 16:09:50,589 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:50,589 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 13 [2020-10-12 16:09:50,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 10 [2020-10-12 16:09:50,590 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 20 [2020-10-12 16:09:50,590 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:09:50,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-12 16:09:50,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-12 16:09:50,863 FATAL L256 erpolLogProxyWrapper]: Now shrinking... [2020-10-12 16:09:50,864 FATAL L256 erpolLogProxyWrapper]: Timeout: 5000 [2020-10-12 16:09:50,865 FATAL L256 erpolLogProxyWrapper]: Cardinality of Constraint set: 7 [2020-10-12 16:09:50,865 FATAL L256 erpolLogProxyWrapper]: Number of enumerated Muses: 1 [2020-10-12 16:09:50,865 FATAL L256 erpolLogProxyWrapper]: Time needed for enumeration: 1 [2020-10-12 16:09:50,865 FATAL L256 erpolLogProxyWrapper]: Heuristic: BIGGEST [2020-10-12 16:09:50,865 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has size: 1 [2020-10-12 16:09:50,866 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has depth: 1 [2020-10-12 16:09:50,866 FATAL L256 erpolLogProxyWrapper]: Chosen Mus has width: 1 [2020-10-12 16:09:50,866 FATAL L256 erpolLogProxyWrapper]: Time needed for Heuristics: 0 [2020-10-12 16:09:50,869 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-12 16:09:50,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626632504] [2020-10-12 16:09:50,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-10-12 16:09:50,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-10-12 16:09:50,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102407649] [2020-10-12 16:09:50,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-12 16:09:50,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-12 16:09:50,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-12 16:09:50,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-10-12 16:09:50,873 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 13 states. [2020-10-12 16:09:51,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-12 16:09:51,108 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-10-12 16:09:51,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-12 16:09:51,109 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 23 [2020-10-12 16:09:51,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-12 16:09:51,109 INFO L225 Difference]: With dead ends: 24 [2020-10-12 16:09:51,109 INFO L226 Difference]: Without dead ends: 0 [2020-10-12 16:09:51,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-10-12 16:09:51,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-10-12 16:09:51,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-10-12 16:09:51,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-10-12 16:09:51,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-10-12 16:09:51,112 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 23 [2020-10-12 16:09:51,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-12 16:09:51,113 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-10-12 16:09:51,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-12 16:09:51,113 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-10-12 16:09:51,113 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-10-12 16:09:51,113 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-12 16:09:51,117 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-10-12 16:09:51,258 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-10-12 16:09:51,258 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-10-12 16:09:51,258 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-10-12 16:09:51,259 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-10-12 16:09:51,259 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-10-12 16:09:51,259 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-10-12 16:09:51,259 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-10-12 16:09:51,259 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-10-12 16:09:51,260 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-10-12 16:09:51,260 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-10-12 16:09:51,260 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 25) the Hoare annotation is: true [2020-10-12 16:09:51,260 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 25) no Hoare annotation was computed. [2020-10-12 16:09:51,260 INFO L268 CegarLoopResult]: For program point L23(line 23) no Hoare annotation was computed. [2020-10-12 16:09:51,260 INFO L268 CegarLoopResult]: For program point L19(lines 19 21) no Hoare annotation was computed. [2020-10-12 16:09:51,261 INFO L268 CegarLoopResult]: For program point L17(line 17) no Hoare annotation was computed. [2020-10-12 16:09:51,261 INFO L268 CegarLoopResult]: For program point L18-2(lines 18 22) no Hoare annotation was computed. [2020-10-12 16:09:51,261 INFO L264 CegarLoopResult]: At program point L18-3(lines 18 22) the Hoare annotation is: (let ((.cse0 (* 2 main_~n~0))) (let ((.cse2 (<= .cse0 main_~i~0)) (.cse3 (<= main_~i~0 .cse0))) (or (let ((.cse1 (+ main_~i~0 1))) (and (<= .cse0 .cse1) (<= .cse1 .cse0) (<= .cse1 (* 2 main_~k~0)))) (and (<= 0 main_~n~0) (<= main_~n~0 0) .cse2 .cse3) (and .cse2 .cse3 (< main_~n~0 (+ main_~k~0 1)))))) [2020-10-12 16:09:51,261 INFO L264 CegarLoopResult]: At program point L18-4(lines 18 22) the Hoare annotation is: (or (= main_~n~0 main_~k~0) (< main_~k~0 0)) [2020-10-12 16:09:51,261 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 25) no Hoare annotation was computed. [2020-10-12 16:09:51,262 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-10-12 16:09:51,262 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-10-12 16:09:51,262 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-10-12 16:09:51,262 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-10-12 16:09:51,262 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-10-12 16:09:51,262 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-10-12 16:09:51,283 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.10 04:09:51 BoogieIcfgContainer [2020-10-12 16:09:51,283 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-12 16:09:51,286 INFO L168 Benchmark]: Toolchain (without parser) took 5068.86 ms. Allocated memory was 140.5 MB in the beginning and 246.9 MB in the end (delta: 106.4 MB). Free memory was 103.8 MB in the beginning and 105.2 MB in the end (delta: -1.4 MB). Peak memory consumption was 105.0 MB. Max. memory is 7.1 GB. [2020-10-12 16:09:51,287 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. [2020-10-12 16:09:51,288 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.12 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 93.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-10-12 16:09:51,289 INFO L168 Benchmark]: Boogie Preprocessor took 105.55 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 93.9 MB in the beginning and 181.3 MB in the end (delta: -87.3 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-10-12 16:09:51,290 INFO L168 Benchmark]: RCFGBuilder took 261.61 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 167.7 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-10-12 16:09:51,291 INFO L168 Benchmark]: TraceAbstraction took 4454.78 ms. Allocated memory was 202.9 MB in the beginning and 246.9 MB in the end (delta: 44.0 MB). Free memory was 167.7 MB in the beginning and 105.2 MB in the end (delta: 62.5 MB). Peak memory consumption was 106.5 MB. Max. memory is 7.1 GB. [2020-10-12 16:09:51,295 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 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.5 kB). Peak memory consumption was 419.5 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 242.12 ms. Allocated memory is still 140.5 MB. Free memory was 103.4 MB in the beginning and 93.9 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.55 ms. Allocated memory was 140.5 MB in the beginning and 202.9 MB in the end (delta: 62.4 MB). Free memory was 93.9 MB in the beginning and 181.3 MB in the end (delta: -87.3 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 261.61 ms. Allocated memory is still 202.9 MB. Free memory was 181.3 MB in the beginning and 167.7 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4454.78 ms. Allocated memory was 202.9 MB in the beginning and 246.9 MB in the end (delta: 44.0 MB). Free memory was 167.7 MB in the beginning and 105.2 MB in the end (delta: 62.5 MB). Peak memory consumption was 106.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: (((2 * n <= i + 1 && i + 1 <= 2 * n) && i + 1 <= 2 * k) || (((0 <= n && n <= 0) && 2 * n <= i) && i <= 2 * n)) || ((2 * n <= i && i <= 2 * n) && n < k + 1) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.2s, OverallIterations: 7, TraceHistogramMax: 4, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 81 SDtfs, 51 SDslu, 246 SDs, 0 SdLazy, 290 SolverSat, 23 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 90 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 19 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 14 PreInvPairs, 23 NumberOfFragments, 68 HoareAnnotationTreeSize, 14 FomulaSimplifications, 261 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 88 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 2.8s InterpolantComputationTime, 110 NumberOfCodeBlocks, 110 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 103 ConstructedInterpolants, 0 QuantifiedInterpolants, 10433 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 3 PerfectInterpolantSequences, 7/41 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...