/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 --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 16:39:17,723 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 16:39:17,726 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 16:39:17,767 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 16:39:17,767 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 16:39:17,773 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 16:39:17,774 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 16:39:17,780 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 16:39:17,783 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 16:39:17,784 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 16:39:17,784 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 16:39:17,786 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 16:39:17,786 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 16:39:17,787 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 16:39:17,788 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 16:39:17,789 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 16:39:17,790 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 16:39:17,791 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 16:39:17,792 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 16:39:17,794 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 16:39:17,795 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 16:39:17,796 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 16:39:17,797 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 16:39:17,798 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 16:39:17,800 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 16:39:17,801 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 16:39:17,801 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 16:39:17,802 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 16:39:17,802 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 16:39:17,803 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 16:39:17,808 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 16:39:17,809 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 16:39:17,809 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 16:39:17,810 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 [2020-08-21 16:39:17,832 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 16:39:17,832 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 16:39:17,833 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 16:39:17,834 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 16:39:17,834 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 16:39:17,834 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 16:39:17,834 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 16:39:17,835 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 16:39:17,835 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 16:39:17,835 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 16:39:17,835 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 16:39:17,835 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 16:39:17,836 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 16:39:17,836 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 16:39:17,836 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 16:39:17,836 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 16:39:17,836 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 16:39:17,837 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 16:39:17,837 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 16:39:17,837 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 16:39:17,837 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 16:39:17,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:39:17,838 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 16:39:17,838 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 16:39:17,838 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 16:39:17,838 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 16:39:17,838 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 16:39:17,838 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 16:39:17,839 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 16:39:17,839 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.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 16:39:18,148 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 16:39:18,162 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 16:39:18,166 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 16:39:18,167 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 16:39:18,168 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 16:39:18,169 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-08-21 16:39:18,233 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fcfef5b91/eb48877b96ac4966a7035ff1516e48cd/FLAG57cc9a25c [2020-08-21 16:39:18,674 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 16:39:18,675 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-1.i [2020-08-21 16:39:18,684 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fcfef5b91/eb48877b96ac4966a7035ff1516e48cd/FLAG57cc9a25c [2020-08-21 16:39:19,001 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/fcfef5b91/eb48877b96ac4966a7035ff1516e48cd [2020-08-21 16:39:19,010 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 16:39:19,012 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 16:39:19,013 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 16:39:19,013 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 16:39:19,017 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 16:39:19,018 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,022 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59c286c8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19, skipping insertion in model container [2020-08-21 16:39:19,022 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,031 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 16:39:19,053 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 16:39:19,308 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:39:19,313 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 16:39:19,361 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:39:19,460 INFO L208 MainTranslator]: Completed translation [2020-08-21 16:39:19,461 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19 WrapperNode [2020-08-21 16:39:19,461 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 16:39:19,462 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 16:39:19,462 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 16:39:19,462 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 16:39:19,476 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,478 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,497 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,497 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,506 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,513 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,514 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (1/1) ... [2020-08-21 16:39:19,517 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 16:39:19,518 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 16:39:19,518 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 16:39:19,518 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 16:39:19,519 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (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 [2020-08-21 16:39:19,587 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 16:39:19,587 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 16:39:19,588 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 16:39:19,588 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 16:39:19,588 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 16:39:19,588 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 16:39:19,588 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 16:39:19,588 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 16:39:19,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 16:39:19,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 16:39:19,589 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 16:39:19,589 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 16:39:19,589 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 16:39:19,589 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 16:39:19,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 16:39:19,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 16:39:19,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 16:39:19,892 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 16:39:19,892 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-21 16:39:19,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:39:19 BoogieIcfgContainer [2020-08-21 16:39:19,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 16:39:19,898 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 16:39:19,898 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 16:39:19,902 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 16:39:19,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 04:39:19" (1/3) ... [2020-08-21 16:39:19,903 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3359eabd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:39:19, skipping insertion in model container [2020-08-21 16:39:19,903 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:39:19" (2/3) ... [2020-08-21 16:39:19,904 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3359eabd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:39:19, skipping insertion in model container [2020-08-21 16:39:19,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:39:19" (3/3) ... [2020-08-21 16:39:19,905 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-08-21 16:39:19,917 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 16:39:19,926 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 16:39:19,946 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 16:39:19,976 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 16:39:19,977 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 16:39:19,977 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 16:39:19,977 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 16:39:19,977 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 16:39:19,977 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 16:39:19,978 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 16:39:19,978 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 16:39:20,009 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-08-21 16:39:20,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 16:39:20,017 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:20,018 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] [2020-08-21 16:39:20,019 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:20,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:20,027 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-08-21 16:39:20,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:20,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2030794257] [2020-08-21 16:39:20,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:20,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:20,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:20,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:20,278 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:39:20,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2030794257] [2020-08-21 16:39:20,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:39:20,281 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 16:39:20,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338660994] [2020-08-21 16:39:20,288 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 16:39:20,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:20,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 16:39:20,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 16:39:20,311 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-08-21 16:39:20,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:20,529 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-08-21 16:39:20,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 16:39:20,532 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-08-21 16:39:20,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:20,552 INFO L225 Difference]: With dead ends: 73 [2020-08-21 16:39:20,552 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 16:39:20,557 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 [2020-08-21 16:39:20,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 16:39:20,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-08-21 16:39:20,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 16:39:20,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-08-21 16:39:20,603 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-08-21 16:39:20,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:20,604 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-08-21 16:39:20,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 16:39:20,604 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-08-21 16:39:20,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 16:39:20,605 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:20,606 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] [2020-08-21 16:39:20,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 16:39:20,607 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:20,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:20,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-08-21 16:39:20,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:20,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026535638] [2020-08-21 16:39:20,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:20,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:20,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:20,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:20,690 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 16:39:20,690 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026535638] [2020-08-21 16:39:20,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:20,691 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 16:39:20,691 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214858791] [2020-08-21 16:39:20,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 16:39:20,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:20,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 16:39:20,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:39:20,694 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-08-21 16:39:20,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:20,806 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-08-21 16:39:20,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 16:39:20,807 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-08-21 16:39:20,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:20,808 INFO L225 Difference]: With dead ends: 65 [2020-08-21 16:39:20,808 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 16:39:20,810 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 [2020-08-21 16:39:20,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 16:39:20,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-08-21 16:39:20,817 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 16:39:20,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-21 16:39:20,818 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-08-21 16:39:20,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:20,819 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-21 16:39:20,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 16:39:20,819 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-21 16:39:20,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 16:39:20,821 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:20,821 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] [2020-08-21 16:39:20,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 16:39:20,822 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:20,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:20,822 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-08-21 16:39:20,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:20,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312555345] [2020-08-21 16:39:20,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:20,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:20,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:20,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:20,973 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-21 16:39:20,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312555345] [2020-08-21 16:39:20,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:20,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 16:39:20,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985940545] [2020-08-21 16:39:20,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 16:39:20,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:20,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 16:39:20,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:39:20,977 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-08-21 16:39:21,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:21,120 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-08-21 16:39:21,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 16:39:21,121 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-08-21 16:39:21,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:21,122 INFO L225 Difference]: With dead ends: 75 [2020-08-21 16:39:21,122 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 16:39:21,123 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 [2020-08-21 16:39:21,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 16:39:21,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-08-21 16:39:21,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 16:39:21,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-08-21 16:39:21,131 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-08-21 16:39:21,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:21,131 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-08-21 16:39:21,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 16:39:21,132 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-08-21 16:39:21,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 16:39:21,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:21,133 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] [2020-08-21 16:39:21,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 16:39:21,134 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:21,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:21,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-08-21 16:39:21,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:21,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326491136] [2020-08-21 16:39:21,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:21,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:21,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:21,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:21,212 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-21 16:39:21,213 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326491136] [2020-08-21 16:39:21,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:21,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 16:39:21,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398878299] [2020-08-21 16:39:21,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 16:39:21,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:21,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 16:39:21,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:39:21,215 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-08-21 16:39:21,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:21,350 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-08-21 16:39:21,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:39:21,351 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-08-21 16:39:21,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:21,353 INFO L225 Difference]: With dead ends: 85 [2020-08-21 16:39:21,353 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 16:39:21,354 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 [2020-08-21 16:39:21,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 16:39:21,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-08-21 16:39:21,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 16:39:21,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-08-21 16:39:21,367 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-08-21 16:39:21,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:21,367 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-08-21 16:39:21,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 16:39:21,368 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-08-21 16:39:21,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 16:39:21,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:21,372 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] [2020-08-21 16:39:21,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 16:39:21,372 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:21,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:21,372 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-08-21 16:39:21,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:21,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1342491492] [2020-08-21 16:39:21,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:21,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:21,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:21,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:21,498 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-08-21 16:39:21,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1342491492] [2020-08-21 16:39:21,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:21,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 16:39:21,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592761231] [2020-08-21 16:39:21,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:39:21,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:21,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:39:21,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:39:21,501 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-08-21 16:39:21,648 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:21,648 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-08-21 16:39:21,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 16:39:21,649 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-08-21 16:39:21,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:21,650 INFO L225 Difference]: With dead ends: 93 [2020-08-21 16:39:21,650 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 16:39:21,651 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 [2020-08-21 16:39:21,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 16:39:21,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-08-21 16:39:21,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 16:39:21,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 16:39:21,658 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-08-21 16:39:21,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:21,658 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 16:39:21,658 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:39:21,658 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 16:39:21,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 16:39:21,660 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:21,660 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] [2020-08-21 16:39:21,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 16:39:21,660 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:21,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:21,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-08-21 16:39:21,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:21,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98554058] [2020-08-21 16:39:21,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:21,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:21,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:21,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:21,792 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-08-21 16:39:21,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98554058] [2020-08-21 16:39:21,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:39:21,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 16:39:21,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195755338] [2020-08-21 16:39:21,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:39:21,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:21,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:39:21,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:39:21,795 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 16:39:21,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:21,912 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 16:39:21,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 16:39:21,912 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 44 [2020-08-21 16:39:21,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:21,914 INFO L225 Difference]: With dead ends: 62 [2020-08-21 16:39:21,914 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 16:39:21,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:21,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 16:39:21,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 16:39:21,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 16:39:21,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 16:39:21,922 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 44 [2020-08-21 16:39:21,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:21,922 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 16:39:21,923 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:39:21,923 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 16:39:21,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 16:39:21,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:21,924 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 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] [2020-08-21 16:39:21,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 16:39:21,925 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:21,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:21,925 INFO L82 PathProgramCache]: Analyzing trace with hash -637010121, now seen corresponding path program 1 times [2020-08-21 16:39:21,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:21,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009844900] [2020-08-21 16:39:21,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:21,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:22,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,048 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2020-08-21 16:39:22,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009844900] [2020-08-21 16:39:22,049 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:22,049 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 16:39:22,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285357788] [2020-08-21 16:39:22,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 16:39:22,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:22,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 16:39:22,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:39:22,051 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 9 states. [2020-08-21 16:39:22,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:22,228 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2020-08-21 16:39:22,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 16:39:22,229 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2020-08-21 16:39:22,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:22,230 INFO L225 Difference]: With dead ends: 55 [2020-08-21 16:39:22,230 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 16:39:22,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:39:22,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 16:39:22,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 16:39:22,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 16:39:22,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 16:39:22,237 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 46 [2020-08-21 16:39:22,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:22,238 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 16:39:22,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 16:39:22,238 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 16:39:22,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 16:39:22,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:22,239 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:22,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 16:39:22,240 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:22,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:22,240 INFO L82 PathProgramCache]: Analyzing trace with hash -1604149734, now seen corresponding path program 1 times [2020-08-21 16:39:22,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:22,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1170066253] [2020-08-21 16:39:22,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:22,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:22,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,316 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-21 16:39:22,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1170066253] [2020-08-21 16:39:22,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:39:22,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 16:39:22,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1692529926] [2020-08-21 16:39:22,319 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 16:39:22,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:22,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 16:39:22,320 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:39:22,321 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 16:39:22,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:22,381 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2020-08-21 16:39:22,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 16:39:22,383 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 16:39:22,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:22,384 INFO L225 Difference]: With dead ends: 67 [2020-08-21 16:39:22,385 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 16:39:22,386 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 [2020-08-21 16:39:22,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 16:39:22,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 16:39:22,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 16:39:22,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2020-08-21 16:39:22,392 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 48 [2020-08-21 16:39:22,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:22,392 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2020-08-21 16:39:22,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 16:39:22,392 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2020-08-21 16:39:22,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 16:39:22,393 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:22,393 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:22,394 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 16:39:22,394 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:22,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:22,394 INFO L82 PathProgramCache]: Analyzing trace with hash 855134175, now seen corresponding path program 1 times [2020-08-21 16:39:22,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:22,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1934615376] [2020-08-21 16:39:22,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:22,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:22,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,508 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-21 16:39:22,508 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1934615376] [2020-08-21 16:39:22,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:22,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:39:22,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551547261] [2020-08-21 16:39:22,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:39:22,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:22,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:39:22,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:39:22,510 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand 10 states. [2020-08-21 16:39:22,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:22,663 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2020-08-21 16:39:22,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 16:39:22,664 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 50 [2020-08-21 16:39:22,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:22,665 INFO L225 Difference]: With dead ends: 70 [2020-08-21 16:39:22,665 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 16:39:22,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:39:22,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 16:39:22,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 16:39:22,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 16:39:22,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2020-08-21 16:39:22,672 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 50 [2020-08-21 16:39:22,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:22,672 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2020-08-21 16:39:22,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:39:22,673 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2020-08-21 16:39:22,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 16:39:22,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:22,674 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:22,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 16:39:22,674 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:22,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:22,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1926047290, now seen corresponding path program 2 times [2020-08-21 16:39:22,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:22,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112390323] [2020-08-21 16:39:22,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:22,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:22,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:22,819 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-08-21 16:39:22,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112390323] [2020-08-21 16:39:22,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:22,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:39:22,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523584531] [2020-08-21 16:39:22,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:39:22,821 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:22,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:39:22,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:22,822 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 11 states. [2020-08-21 16:39:23,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:23,030 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-08-21 16:39:23,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 16:39:23,030 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2020-08-21 16:39:23,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:23,031 INFO L225 Difference]: With dead ends: 61 [2020-08-21 16:39:23,031 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 16:39:23,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:39:23,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 16:39:23,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 16:39:23,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 16:39:23,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2020-08-21 16:39:23,038 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 52 [2020-08-21 16:39:23,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:23,038 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2020-08-21 16:39:23,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:39:23,039 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2020-08-21 16:39:23,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 16:39:23,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:23,040 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 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] [2020-08-21 16:39:23,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 16:39:23,040 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:23,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:23,040 INFO L82 PathProgramCache]: Analyzing trace with hash 477761629, now seen corresponding path program 3 times [2020-08-21 16:39:23,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:23,041 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118686787] [2020-08-21 16:39:23,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:23,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:23,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,108 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 16:39:23,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118686787] [2020-08-21 16:39:23,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:23,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 16:39:23,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191228410] [2020-08-21 16:39:23,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 16:39:23,110 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:23,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 16:39:23,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:39:23,111 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 7 states. [2020-08-21 16:39:23,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:23,192 INFO L93 Difference]: Finished difference Result 86 states and 100 transitions. [2020-08-21 16:39:23,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:39:23,192 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 54 [2020-08-21 16:39:23,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:23,193 INFO L225 Difference]: With dead ends: 86 [2020-08-21 16:39:23,193 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 16:39:23,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:39:23,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 16:39:23,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 67. [2020-08-21 16:39:23,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 16:39:23,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2020-08-21 16:39:23,206 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 54 [2020-08-21 16:39:23,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:23,206 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2020-08-21 16:39:23,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 16:39:23,206 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2020-08-21 16:39:23,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 16:39:23,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:23,207 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 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] [2020-08-21 16:39:23,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 16:39:23,208 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:23,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:23,208 INFO L82 PathProgramCache]: Analyzing trace with hash 945709890, now seen corresponding path program 1 times [2020-08-21 16:39:23,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:23,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574656401] [2020-08-21 16:39:23,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:23,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,308 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:23,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,312 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 16:39:23,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574656401] [2020-08-21 16:39:23,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:23,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 16:39:23,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595519547] [2020-08-21 16:39:23,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:39:23,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:23,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:39:23,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:39:23,314 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand 8 states. [2020-08-21 16:39:23,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:23,393 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2020-08-21 16:39:23,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:39:23,394 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 56 [2020-08-21 16:39:23,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:23,395 INFO L225 Difference]: With dead ends: 79 [2020-08-21 16:39:23,395 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 16:39:23,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:39:23,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 16:39:23,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 16:39:23,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 16:39:23,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2020-08-21 16:39:23,402 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 56 [2020-08-21 16:39:23,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:23,402 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2020-08-21 16:39:23,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:39:23,403 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2020-08-21 16:39:23,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 16:39:23,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:23,405 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 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] [2020-08-21 16:39:23,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 16:39:23,406 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:23,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:23,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1888314782, now seen corresponding path program 4 times [2020-08-21 16:39:23,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:23,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682047650] [2020-08-21 16:39:23,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:23,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:23,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,521 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 16:39:23,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682047650] [2020-08-21 16:39:23,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:23,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 16:39:23,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717722251] [2020-08-21 16:39:23,522 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 16:39:23,522 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:23,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 16:39:23,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:39:23,523 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand 12 states. [2020-08-21 16:39:23,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:23,709 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2020-08-21 16:39:23,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 16:39:23,710 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-08-21 16:39:23,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:23,710 INFO L225 Difference]: With dead ends: 80 [2020-08-21 16:39:23,718 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 16:39:23,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:39:23,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 16:39:23,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 16:39:23,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 16:39:23,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 65 transitions. [2020-08-21 16:39:23,724 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 65 transitions. Word has length 56 [2020-08-21 16:39:23,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:23,724 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 65 transitions. [2020-08-21 16:39:23,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 16:39:23,725 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 65 transitions. [2020-08-21 16:39:23,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 16:39:23,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:23,726 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 3, 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] [2020-08-21 16:39:23,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 16:39:23,726 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:23,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:23,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1242276355, now seen corresponding path program 5 times [2020-08-21 16:39:23,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:23,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144664893] [2020-08-21 16:39:23,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:23,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:23,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:23,874 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-08-21 16:39:23,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144664893] [2020-08-21 16:39:23,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:23,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 16:39:23,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184712224] [2020-08-21 16:39:23,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 16:39:23,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:23,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 16:39:23,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:39:23,877 INFO L87 Difference]: Start difference. First operand 59 states and 65 transitions. Second operand 13 states. [2020-08-21 16:39:24,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:24,114 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2020-08-21 16:39:24,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 16:39:24,115 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 58 [2020-08-21 16:39:24,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:24,116 INFO L225 Difference]: With dead ends: 67 [2020-08-21 16:39:24,116 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 16:39:24,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2020-08-21 16:39:24,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 16:39:24,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 16:39:24,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 16:39:24,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2020-08-21 16:39:24,127 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 58 [2020-08-21 16:39:24,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:24,128 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2020-08-21 16:39:24,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 16:39:24,128 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2020-08-21 16:39:24,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 16:39:24,132 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:24,133 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:24,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 16:39:24,133 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:24,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:24,134 INFO L82 PathProgramCache]: Analyzing trace with hash 850551648, now seen corresponding path program 6 times [2020-08-21 16:39:24,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:24,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1053898952] [2020-08-21 16:39:24,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:24,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:24,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:24,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:24,226 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 16:39:24,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1053898952] [2020-08-21 16:39:24,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:24,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 16:39:24,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061611941] [2020-08-21 16:39:24,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 16:39:24,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:24,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 16:39:24,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:39:24,229 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand 9 states. [2020-08-21 16:39:24,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:24,341 INFO L93 Difference]: Finished difference Result 100 states and 118 transitions. [2020-08-21 16:39:24,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:39:24,341 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 60 [2020-08-21 16:39:24,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:24,342 INFO L225 Difference]: With dead ends: 100 [2020-08-21 16:39:24,342 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 16:39:24,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:24,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 16:39:24,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2020-08-21 16:39:24,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 16:39:24,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2020-08-21 16:39:24,353 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 60 [2020-08-21 16:39:24,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:24,353 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2020-08-21 16:39:24,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 16:39:24,353 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2020-08-21 16:39:24,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 16:39:24,354 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:24,354 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:24,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 16:39:24,354 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:24,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:24,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1426761989, now seen corresponding path program 2 times [2020-08-21 16:39:24,355 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:24,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [462281964] [2020-08-21 16:39:24,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:24,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:24,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:24,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:24,458 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 16:39:24,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [462281964] [2020-08-21 16:39:24,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:24,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:39:24,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405491164] [2020-08-21 16:39:24,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:39:24,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:24,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:39:24,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:39:24,463 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand 10 states. [2020-08-21 16:39:24,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:24,582 INFO L93 Difference]: Finished difference Result 102 states and 120 transitions. [2020-08-21 16:39:24,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:39:24,582 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 62 [2020-08-21 16:39:24,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:24,583 INFO L225 Difference]: With dead ends: 102 [2020-08-21 16:39:24,583 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 16:39:24,584 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:39:24,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 16:39:24,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 79. [2020-08-21 16:39:24,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 16:39:24,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2020-08-21 16:39:24,591 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 62 [2020-08-21 16:39:24,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:24,591 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2020-08-21 16:39:24,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:39:24,591 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2020-08-21 16:39:24,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 16:39:24,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:24,592 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 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] [2020-08-21 16:39:24,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 16:39:24,593 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:24,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:24,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1340435035, now seen corresponding path program 7 times [2020-08-21 16:39:24,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:24,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242039113] [2020-08-21 16:39:24,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:24,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:24,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:24,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:24,773 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 16:39:24,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242039113] [2020-08-21 16:39:24,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:24,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 16:39:24,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761216589] [2020-08-21 16:39:24,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 16:39:24,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:24,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 16:39:24,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:39:24,776 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand 14 states. [2020-08-21 16:39:25,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:25,031 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-08-21 16:39:25,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 16:39:25,032 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2020-08-21 16:39:25,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:25,033 INFO L225 Difference]: With dead ends: 115 [2020-08-21 16:39:25,033 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 16:39:25,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:39:25,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 16:39:25,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2020-08-21 16:39:25,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 16:39:25,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2020-08-21 16:39:25,042 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 62 [2020-08-21 16:39:25,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:25,043 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2020-08-21 16:39:25,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 16:39:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2020-08-21 16:39:25,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 16:39:25,044 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:25,045 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 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] [2020-08-21 16:39:25,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 16:39:25,045 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:25,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:25,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1186490752, now seen corresponding path program 8 times [2020-08-21 16:39:25,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:25,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1690207837] [2020-08-21 16:39:25,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:25,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:25,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:25,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:25,200 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 12 proven. 17 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2020-08-21 16:39:25,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1690207837] [2020-08-21 16:39:25,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:25,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 16:39:25,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769368191] [2020-08-21 16:39:25,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 16:39:25,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:25,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 16:39:25,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:39:25,202 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand 15 states. [2020-08-21 16:39:25,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:25,519 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2020-08-21 16:39:25,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 16:39:25,520 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 64 [2020-08-21 16:39:25,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:25,521 INFO L225 Difference]: With dead ends: 91 [2020-08-21 16:39:25,521 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 16:39:25,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=509, Unknown=0, NotChecked=0, Total=650 [2020-08-21 16:39:25,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 16:39:25,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 16:39:25,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 16:39:25,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 96 transitions. [2020-08-21 16:39:25,534 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 96 transitions. Word has length 64 [2020-08-21 16:39:25,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:25,534 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 96 transitions. [2020-08-21 16:39:25,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 16:39:25,534 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 96 transitions. [2020-08-21 16:39:25,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 16:39:25,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:25,535 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:25,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 16:39:25,536 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:25,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:25,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1374058717, now seen corresponding path program 9 times [2020-08-21 16:39:25,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:25,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011210938] [2020-08-21 16:39:25,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:25,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:25,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:25,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:25,638 INFO L134 CoverageAnalysis]: Checked inductivity of 98 backedges. 11 proven. 17 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-08-21 16:39:25,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011210938] [2020-08-21 16:39:25,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:25,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:39:25,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488484590] [2020-08-21 16:39:25,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:39:25,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:25,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:39:25,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:25,643 INFO L87 Difference]: Start difference. First operand 85 states and 96 transitions. Second operand 11 states. [2020-08-21 16:39:25,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:25,836 INFO L93 Difference]: Finished difference Result 143 states and 173 transitions. [2020-08-21 16:39:25,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 16:39:25,836 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 66 [2020-08-21 16:39:25,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:25,837 INFO L225 Difference]: With dead ends: 143 [2020-08-21 16:39:25,837 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 16:39:25,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:39:25,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 16:39:25,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 103. [2020-08-21 16:39:25,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 16:39:25,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2020-08-21 16:39:25,845 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 66 [2020-08-21 16:39:25,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:25,846 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2020-08-21 16:39:25,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:39:25,846 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2020-08-21 16:39:25,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 16:39:25,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:25,847 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:25,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 16:39:25,847 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:25,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:25,848 INFO L82 PathProgramCache]: Analyzing trace with hash -2063125144, now seen corresponding path program 3 times [2020-08-21 16:39:25,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:25,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204105873] [2020-08-21 16:39:25,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:25,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:25,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:25,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:25,932 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 22 proven. 14 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2020-08-21 16:39:25,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204105873] [2020-08-21 16:39:25,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:25,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:39:25,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839893891] [2020-08-21 16:39:25,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:39:25,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:25,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:39:25,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:39:25,934 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand 10 states. [2020-08-21 16:39:26,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:26,076 INFO L93 Difference]: Finished difference Result 121 states and 140 transitions. [2020-08-21 16:39:26,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:39:26,077 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-08-21 16:39:26,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:26,078 INFO L225 Difference]: With dead ends: 121 [2020-08-21 16:39:26,078 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 16:39:26,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:39:26,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 16:39:26,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2020-08-21 16:39:26,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 16:39:26,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2020-08-21 16:39:26,086 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 68 [2020-08-21 16:39:26,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:26,087 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2020-08-21 16:39:26,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:39:26,087 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2020-08-21 16:39:26,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 16:39:26,088 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:26,088 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:39:26,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 16:39:26,089 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:26,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:26,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1776856968, now seen corresponding path program 4 times [2020-08-21 16:39:26,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:26,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795943000] [2020-08-21 16:39:26,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:26,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:26,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:26,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:26,184 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 18 proven. 17 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-08-21 16:39:26,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795943000] [2020-08-21 16:39:26,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:26,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:39:26,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617218259] [2020-08-21 16:39:26,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:39:26,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:26,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:39:26,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:39:26,187 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand 11 states. [2020-08-21 16:39:26,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:26,308 INFO L93 Difference]: Finished difference Result 118 states and 141 transitions. [2020-08-21 16:39:26,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 16:39:26,308 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 68 [2020-08-21 16:39:26,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:26,309 INFO L225 Difference]: With dead ends: 118 [2020-08-21 16:39:26,309 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 16:39:26,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:39:26,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 16:39:26,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2020-08-21 16:39:26,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 16:39:26,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2020-08-21 16:39:26,323 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 68 [2020-08-21 16:39:26,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:26,323 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2020-08-21 16:39:26,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:39:26,323 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2020-08-21 16:39:26,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 16:39:26,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:26,324 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 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] [2020-08-21 16:39:26,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 16:39:26,324 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:26,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:26,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1222495832, now seen corresponding path program 10 times [2020-08-21 16:39:26,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:26,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810728091] [2020-08-21 16:39:26,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:26,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:26,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:26,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:26,496 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-08-21 16:39:26,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810728091] [2020-08-21 16:39:26,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:26,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 16:39:26,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056808254] [2020-08-21 16:39:26,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 16:39:26,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:26,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 16:39:26,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:39:26,501 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand 16 states. [2020-08-21 16:39:26,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:26,877 INFO L93 Difference]: Finished difference Result 135 states and 162 transitions. [2020-08-21 16:39:26,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 16:39:26,880 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 68 [2020-08-21 16:39:26,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:26,881 INFO L225 Difference]: With dead ends: 135 [2020-08-21 16:39:26,882 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 16:39:26,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2020-08-21 16:39:26,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 16:39:26,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2020-08-21 16:39:26,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 16:39:26,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 108 transitions. [2020-08-21 16:39:26,892 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 108 transitions. Word has length 68 [2020-08-21 16:39:26,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:26,893 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 108 transitions. [2020-08-21 16:39:26,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 16:39:26,893 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 108 transitions. [2020-08-21 16:39:26,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 16:39:26,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:39:26,899 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 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] [2020-08-21 16:39:26,899 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 16:39:26,900 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:39:26,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:39:26,900 INFO L82 PathProgramCache]: Analyzing trace with hash 1314701251, now seen corresponding path program 11 times [2020-08-21 16:39:26,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:39:26,904 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128324674] [2020-08-21 16:39:26,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:39:26,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:27,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:39:27,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:39:27,294 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 10 proven. 29 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 16:39:27,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128324674] [2020-08-21 16:39:27,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:39:27,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 16:39:27,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630459581] [2020-08-21 16:39:27,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 16:39:27,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:39:27,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 16:39:27,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:39:27,302 INFO L87 Difference]: Start difference. First operand 95 states and 108 transitions. Second operand 13 states. [2020-08-21 16:39:27,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:39:27,426 INFO L93 Difference]: Finished difference Result 95 states and 108 transitions. [2020-08-21 16:39:27,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 16:39:27,427 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 70 [2020-08-21 16:39:27,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:39:27,427 INFO L225 Difference]: With dead ends: 95 [2020-08-21 16:39:27,427 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 16:39:27,428 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:39:27,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 16:39:27,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 16:39:27,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 16:39:27,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 16:39:27,429 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 70 [2020-08-21 16:39:27,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:39:27,429 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 16:39:27,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 16:39:27,429 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 16:39:27,429 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 16:39:27,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 16:39:27,432 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 16:39:27,602 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 136 [2020-08-21 16:39:28,892 WARN L193 SmtUtils]: Spent 1.23 s on a formula simplification. DAG size of input: 132 DAG size of output: 63 [2020-08-21 16:39:29,004 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 28 [2020-08-21 16:39:29,200 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 25 [2020-08-21 16:39:29,204 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-21 16:39:29,204 INFO L264 CegarLoopResult]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#NULL.base| |old(#NULL.base)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2020-08-21 16:39:29,204 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 16:39:29,205 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 16:39:29,205 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 16:39:29,205 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 16:39:29,205 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 16:39:29,205 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 4 6) no Hoare annotation was computed. [2020-08-21 16:39:29,206 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-21 16:39:29,206 INFO L268 CegarLoopResult]: For program point L5-2(lines 4 6) no Hoare annotation was computed. [2020-08-21 16:39:29,206 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 4 6) no Hoare annotation was computed. [2020-08-21 16:39:29,206 INFO L264 CegarLoopResult]: At program point L35-3(lines 35 36) the Hoare annotation is: (let ((.cse0 (<= main_~nc_A~0 2)) (.cse1 (<= 1 main_~nc_B~0)) (.cse4 (= (select (select |#memory_int| |main_~#string_B~0.base|) (+ |main_~#string_B~0.offset| 4)) 0)) (.cse3 (= main_~nc_B~0 0)) (.cse5 (= |main_~#string_B~0.offset| 0)) (.cse2 (= 0 main_~found~0))) (or (and .cse0 .cse1 .cse2) (and .cse3 .cse0 .cse2) (and .cse4 .cse5 (<= main_~nc_B~0 4) .cse1 .cse2) (and .cse4 .cse3 .cse5 .cse2))) [2020-08-21 16:39:29,207 INFO L268 CegarLoopResult]: For program point L35-4(lines 18 61) no Hoare annotation was computed. [2020-08-21 16:39:29,207 INFO L268 CegarLoopResult]: For program point L31-1(lines 31 32) no Hoare annotation was computed. [2020-08-21 16:39:29,207 INFO L264 CegarLoopResult]: At program point L31-3(lines 31 32) the Hoare annotation is: (and (= (select (select |#memory_int| |main_~#string_B~0.base|) (+ |main_~#string_B~0.offset| 4)) 0) (= |main_~#string_B~0.offset| 0) (= 0 main_~found~0)) [2020-08-21 16:39:29,207 INFO L268 CegarLoopResult]: For program point L31-4(lines 31 32) no Hoare annotation was computed. [2020-08-21 16:39:29,207 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 61) no Hoare annotation was computed. [2020-08-21 16:39:29,207 INFO L268 CegarLoopResult]: For program point L44(lines 44 53) no Hoare annotation was computed. [2020-08-21 16:39:29,208 INFO L264 CegarLoopResult]: At program point L44-2(lines 42 54) the Hoare annotation is: (let ((.cse13 (+ main_~j~0 1)) (.cse8 (+ main_~j~0 3))) (let ((.cse1 (<= main_~nc_A~0 2)) (.cse2 (<= main_~nc_A~0 (+ main_~i~0 1))) (.cse10 (<= main_~nc_B~0 3)) (.cse7 (= main_~i~0 main_~j~0)) (.cse5 (<= main_~nc_A~0 main_~i~0)) (.cse4 (<= 3 main_~nc_B~0)) (.cse9 (<= .cse8 main_~nc_B~0)) (.cse0 (<= 4 main_~nc_B~0)) (.cse16 (<= main_~nc_B~0 4)) (.cse12 (= main_~i~0 0)) (.cse6 (<= .cse13 main_~nc_B~0)) (.cse14 (<= 1 main_~nc_B~0)) (.cse15 (<= 2 main_~nc_B~0)) (.cse11 (<= main_~nc_B~0 (+ main_~j~0 2))) (.cse3 (= 0 main_~found~0))) (or (and .cse0 (= main_~j~0 0) .cse1 .cse2 .cse3) (and .cse4 .cse5 .cse6 .cse1 .cse3) (and (<= 0 main_~j~0) (= main_~nc_B~0 0)) (and .cse0 .cse6 .cse1 .cse2 .cse7 .cse3) (and .cse4 (<= main_~nc_B~0 .cse8) .cse9 .cse10 .cse3) (and .cse4 .cse0 .cse5 .cse6 (<= main_~nc_A~0 3) .cse3) (and .cse4 .cse11 .cse10 .cse3) (and .cse12 .cse6 .cse7 .cse3 (<= main_~nc_A~0 (+ main_~i~0 2))) (and (<= main_~nc_B~0 1) (<= main_~nc_B~0 .cse13) .cse14 .cse3) (and .cse15 .cse5 .cse6 (<= main_~nc_A~0 1) .cse3) (and (<= main_~nc_B~0 (+ main_~j~0 4)) .cse4 .cse0 .cse9 .cse16 .cse3) (and .cse0 .cse11 .cse16 .cse3) (and (= main_~nc_A~0 0) .cse12 .cse6 .cse14 .cse3) (and .cse15 .cse11 (<= main_~nc_B~0 2) .cse3)))) [2020-08-21 16:39:29,208 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 16:39:29,208 INFO L268 CegarLoopResult]: For program point L24(line 24) no Hoare annotation was computed. [2020-08-21 16:39:29,208 INFO L264 CegarLoopResult]: At program point L58(line 58) the Hoare annotation is: (let ((.cse0 (+ main_~j~0 1)) (.cse2 (<= 1 main_~nc_B~0)) (.cse3 (<= main_~nc_B~0 main_~j~0)) (.cse1 (= 1 main_~found~0))) (or (and (< main_~nc_B~0 .cse0) (<= main_~nc_B~0 2) .cse1 .cse2) (and (<= 3 main_~nc_B~0) .cse3 (<= main_~nc_B~0 3) .cse1) (and (<= 0 main_~j~0) (= main_~nc_B~0 0) .cse1) (and (<= .cse0 main_~nc_B~0) .cse2 (= 0 main_~found~0)) (and (<= 4 main_~nc_B~0) .cse3 (<= main_~nc_B~0 4) .cse1))) [2020-08-21 16:39:29,208 INFO L268 CegarLoopResult]: For program point L58-1(line 58) no Hoare annotation was computed. [2020-08-21 16:39:29,208 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 61) no Hoare annotation was computed. [2020-08-21 16:39:29,209 INFO L268 CegarLoopResult]: For program point L42-2(lines 42 54) no Hoare annotation was computed. [2020-08-21 16:39:29,209 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 17 61) the Hoare annotation is: (= |old(#valid)| |#valid|) [2020-08-21 16:39:29,209 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 27) no Hoare annotation was computed. [2020-08-21 16:39:29,209 INFO L264 CegarLoopResult]: At program point L26-3(lines 26 27) the Hoare annotation is: (and (= |main_~#string_B~0.offset| 0) (= 0 main_~found~0)) [2020-08-21 16:39:29,209 INFO L268 CegarLoopResult]: For program point L26-4(lines 26 27) no Hoare annotation was computed. [2020-08-21 16:39:29,209 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 23) no Hoare annotation was computed. [2020-08-21 16:39:29,209 INFO L264 CegarLoopResult]: At program point L22-3(lines 22 23) the Hoare annotation is: (and (= |main_~#string_B~0.offset| 0) (= 0 main_~found~0)) [2020-08-21 16:39:29,209 INFO L268 CegarLoopResult]: For program point L22-4(lines 22 23) no Hoare annotation was computed. [2020-08-21 16:39:29,209 INFO L268 CegarLoopResult]: For program point L35-1(lines 35 36) no Hoare annotation was computed. [2020-08-21 16:39:29,210 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 7 12) the Hoare annotation is: true [2020-08-21 16:39:29,210 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 7 12) no Hoare annotation was computed. [2020-08-21 16:39:29,210 INFO L268 CegarLoopResult]: For program point L9(line 9) no Hoare annotation was computed. [2020-08-21 16:39:29,210 INFO L268 CegarLoopResult]: For program point L8(lines 8 10) no Hoare annotation was computed. [2020-08-21 16:39:29,210 INFO L268 CegarLoopResult]: For program point L8-2(lines 7 12) no Hoare annotation was computed. [2020-08-21 16:39:29,210 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 9) no Hoare annotation was computed. [2020-08-21 16:39:29,221 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,226 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,234 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,237 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,238 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,242 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,244 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 04:39:29 BoogieIcfgContainer [2020-08-21 16:39:29,247 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 16:39:29,249 INFO L168 Benchmark]: Toolchain (without parser) took 10237.27 ms. Allocated memory was 138.4 MB in the beginning and 339.7 MB in the end (delta: 201.3 MB). Free memory was 101.7 MB in the beginning and 109.0 MB in the end (delta: -7.3 MB). Peak memory consumption was 194.0 MB. Max. memory is 7.1 GB. [2020-08-21 16:39:29,252 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-21 16:39:29,253 INFO L168 Benchmark]: CACSL2BoogieTranslator took 448.44 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 101.3 MB in the beginning and 180.2 MB in the end (delta: -78.9 MB). Peak memory consumption was 22.4 MB. Max. memory is 7.1 GB. [2020-08-21 16:39:29,254 INFO L168 Benchmark]: Boogie Preprocessor took 55.43 ms. Allocated memory is still 201.3 MB. Free memory was 180.2 MB in the beginning and 177.6 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. [2020-08-21 16:39:29,254 INFO L168 Benchmark]: RCFGBuilder took 379.39 ms. Allocated memory is still 201.3 MB. Free memory was 177.6 MB in the beginning and 158.3 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. [2020-08-21 16:39:29,255 INFO L168 Benchmark]: TraceAbstraction took 9348.72 ms. Allocated memory was 201.3 MB in the beginning and 339.7 MB in the end (delta: 138.4 MB). Free memory was 157.6 MB in the beginning and 109.0 MB in the end (delta: 48.5 MB). Peak memory consumption was 186.9 MB. Max. memory is 7.1 GB. [2020-08-21 16:39:29,261 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 448.44 ms. Allocated memory was 138.4 MB in the beginning and 201.3 MB in the end (delta: 62.9 MB). Free memory was 101.3 MB in the beginning and 180.2 MB in the end (delta: -78.9 MB). Peak memory consumption was 22.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 55.43 ms. Allocated memory is still 201.3 MB. Free memory was 180.2 MB in the beginning and 177.6 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 379.39 ms. Allocated memory is still 201.3 MB. Free memory was 177.6 MB in the beginning and 158.3 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9348.72 ms. Allocated memory was 201.3 MB in the beginning and 339.7 MB in the end (delta: 138.4 MB). Free memory was 157.6 MB in the beginning and 109.0 MB in the end (delta: 48.5 MB). Peak memory consumption was 186.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int - GenericResult: Unfinished Backtranslation unknown boogie variable #memory_int * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 9]: 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: 31]: Loop Invariant [2020-08-21 16:39:29,272 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,276 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int Derived loop invariant: (unknown-#memory_int-unknown[string_B][string_B + 4] == 0 && string_B == 0) && 0 == found - InvariantResult [Line: 26]: Loop Invariant Derived loop invariant: string_B == 0 && 0 == found - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: string_B == 0 && 0 == found - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: ((((((((((((((((4 <= nc_B && j == 0) && nc_A <= 2) && nc_A <= i + 1) && 0 == found) || ((((3 <= nc_B && nc_A <= i) && j + 1 <= nc_B) && nc_A <= 2) && 0 == found)) || (0 <= j && nc_B == 0)) || (((((4 <= nc_B && j + 1 <= nc_B) && nc_A <= 2) && nc_A <= i + 1) && i == j) && 0 == found)) || ((((3 <= nc_B && nc_B <= j + 3) && j + 3 <= nc_B) && nc_B <= 3) && 0 == found)) || (((((3 <= nc_B && 4 <= nc_B) && nc_A <= i) && j + 1 <= nc_B) && nc_A <= 3) && 0 == found)) || (((3 <= nc_B && nc_B <= j + 2) && nc_B <= 3) && 0 == found)) || ((((i == 0 && j + 1 <= nc_B) && i == j) && 0 == found) && nc_A <= i + 2)) || (((nc_B <= 1 && nc_B <= j + 1) && 1 <= nc_B) && 0 == found)) || ((((2 <= nc_B && nc_A <= i) && j + 1 <= nc_B) && nc_A <= 1) && 0 == found)) || (((((nc_B <= j + 4 && 3 <= nc_B) && 4 <= nc_B) && j + 3 <= nc_B) && nc_B <= 4) && 0 == found)) || (((4 <= nc_B && nc_B <= j + 2) && nc_B <= 4) && 0 == found)) || ((((nc_A == 0 && i == 0) && j + 1 <= nc_B) && 1 <= nc_B) && 0 == found)) || (((2 <= nc_B && nc_B <= j + 2) && nc_B <= 2) && 0 == found) - InvariantResult [Line: 35]: Loop Invariant [2020-08-21 16:39:29,279 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,279 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,280 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 16:39:29,280 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int Derived loop invariant: ((((nc_A <= 2 && 1 <= nc_B) && 0 == found) || ((nc_B == 0 && nc_A <= 2) && 0 == found)) || ((((unknown-#memory_int-unknown[string_B][string_B + 4] == 0 && string_B == 0) && nc_B <= 4) && 1 <= nc_B) && 0 == found)) || (((unknown-#memory_int-unknown[string_B][string_B + 4] == 0 && nc_B == 0) && string_B == 0) && 0 == found) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 7.4s, OverallIterations: 23, TraceHistogramMax: 6, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 545 SDtfs, 447 SDslu, 2131 SDs, 0 SdLazy, 2824 SolverSat, 308 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 326 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 254 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 2.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=103occurred in iteration=19, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 23 MinimizatonAttempts, 128 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 38 PreInvPairs, 118 NumberOfFragments, 419 HoareAnnotationTreeSize, 38 FomulaSimplifications, 7556 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 11 FomulaSimplificationsInter, 4917 FormulaSimplificationTreeSizeReductionInter, 1.5s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 1210 NumberOfCodeBlocks, 1210 NumberOfCodeBlocksAsserted, 23 NumberOfCheckSat, 1187 ConstructedInterpolants, 0 QuantifiedInterpolants, 151099 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 23 InterpolantComputations, 3 PerfectInterpolantSequences, 1261/1470 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...