/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:15:50,637 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:15:50,639 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:15:50,668 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:15:50,668 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:15:50,669 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:15:50,671 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:15:50,672 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:15:50,674 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:15:50,675 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:15:50,676 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:15:50,677 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:15:50,677 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:15:50,678 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:15:50,679 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:15:50,681 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:15:50,681 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:15:50,682 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:15:50,684 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:15:50,686 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:15:50,688 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:15:50,689 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:15:50,690 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:15:50,691 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:15:50,694 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 18:15:50,701 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:15:50,702 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:15:50,703 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:15:50,704 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 18:15:50,727 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:15:50,727 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:15:50,728 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:15:50,729 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:15:50,729 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:15:50,729 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:15:50,729 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:15:50,729 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:15:50,730 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:15:50,730 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:15:50,730 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:15:50,730 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:15:50,730 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:15:50,731 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:15:50,731 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:15:50,731 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:15:50,731 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:15:50,731 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:15:50,732 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:15:50,732 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:15:50,732 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:15:50,732 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:15:50,732 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:15:50,733 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:15:50,733 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:15:50,733 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:15:50,733 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:15:50,733 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:15:50,734 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:15:50,734 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=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=LOWLEXORDER;log-additional-information=true; [2020-08-21 18:15:51,068 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:15:51,091 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:15:51,096 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:15:51,098 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:15:51,099 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:15:51,100 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 18:15:51,177 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a9f1d8aad/69ffca90b8ff498c95f25c3cfc3bce96/FLAG170ed6adc [2020-08-21 18:15:51,624 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:15:51,625 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/invert_string-1.c [2020-08-21 18:15:51,631 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a9f1d8aad/69ffca90b8ff498c95f25c3cfc3bce96/FLAG170ed6adc [2020-08-21 18:15:52,010 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/a9f1d8aad/69ffca90b8ff498c95f25c3cfc3bce96 [2020-08-21 18:15:52,020 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:15:52,022 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:15:52,024 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:15:52,024 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:15:52,027 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:15:52,028 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,032 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e62aa9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52, skipping insertion in model container [2020-08-21 18:15:52,032 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,040 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:15:52,060 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:15:52,281 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:15:52,285 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:15:52,310 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:15:52,331 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:15:52,331 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52 WrapperNode [2020-08-21 18:15:52,332 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:15:52,332 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:15:52,333 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:15:52,333 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:15:52,422 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,424 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,432 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,432 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,439 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,445 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,446 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (1/1) ... [2020-08-21 18:15:52,448 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:15:52,449 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:15:52,449 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:15:52,449 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:15:52,450 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (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 18:15:52,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:15:52,520 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:15:52,520 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 18:15:52,521 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:15:52,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:15:52,521 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 18:15:52,521 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 18:15:52,522 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 18:15:52,522 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 18:15:52,523 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:15:52,523 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 18:15:52,523 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 18:15:52,523 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 18:15:52,523 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 18:15:52,524 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:15:52,525 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:15:52,784 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:15:52,784 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 18:15:52,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:15:52 BoogieIcfgContainer [2020-08-21 18:15:52,789 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:15:52,790 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:15:52,790 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:15:52,793 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:15:52,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:15:52" (1/3) ... [2020-08-21 18:15:52,794 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6114d927 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:15:52, skipping insertion in model container [2020-08-21 18:15:52,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:15:52" (2/3) ... [2020-08-21 18:15:52,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6114d927 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:15:52, skipping insertion in model container [2020-08-21 18:15:52,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:15:52" (3/3) ... [2020-08-21 18:15:52,797 INFO L109 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-08-21 18:15:52,809 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:15:52,819 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:15:52,834 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:15:52,859 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:15:52,859 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:15:52,860 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:15:52,860 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:15:52,860 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:15:52,860 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:15:52,860 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:15:52,860 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:15:52,880 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-08-21 18:15:52,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 18:15:52,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:52,889 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:52,889 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:52,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:52,895 INFO L82 PathProgramCache]: Analyzing trace with hash -474003824, now seen corresponding path program 1 times [2020-08-21 18:15:52,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:52,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516644175] [2020-08-21 18:15:52,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:53,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:53,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,102 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 18:15:53,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516644175] [2020-08-21 18:15:53,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:53,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 18:15:53,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809024435] [2020-08-21 18:15:53,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 18:15:53,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:53,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 18:15:53,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:15:53,126 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2020-08-21 18:15:53,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:53,222 INFO L93 Difference]: Finished difference Result 51 states and 65 transitions. [2020-08-21 18:15:53,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 18:15:53,224 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-21 18:15:53,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:53,234 INFO L225 Difference]: With dead ends: 51 [2020-08-21 18:15:53,234 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:15:53,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 18:15:53,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:15:53,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 18:15:53,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 18:15:53,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 18:15:53,283 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2020-08-21 18:15:53,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:53,284 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 18:15:53,284 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 18:15:53,284 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 18:15:53,285 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 18:15:53,285 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:53,285 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:53,286 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:15:53,286 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:53,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:53,287 INFO L82 PathProgramCache]: Analyzing trace with hash 227060754, now seen corresponding path program 1 times [2020-08-21 18:15:53,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:53,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670546466] [2020-08-21 18:15:53,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:53,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:53,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,429 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 18:15:53,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670546466] [2020-08-21 18:15:53,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:53,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:15:53,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403868631] [2020-08-21 18:15:53,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:15:53,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:53,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:15:53,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:15:53,434 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 5 states. [2020-08-21 18:15:53,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:53,550 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-08-21 18:15:53,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:15:53,551 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 18:15:53,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:53,555 INFO L225 Difference]: With dead ends: 44 [2020-08-21 18:15:53,555 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:15:53,557 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:15:53,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:15:53,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-08-21 18:15:53,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 18:15:53,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2020-08-21 18:15:53,569 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 17 [2020-08-21 18:15:53,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:53,570 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2020-08-21 18:15:53,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:15:53,570 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2020-08-21 18:15:53,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:15:53,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:53,571 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:53,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:15:53,572 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:53,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:53,572 INFO L82 PathProgramCache]: Analyzing trace with hash -714610672, now seen corresponding path program 1 times [2020-08-21 18:15:53,573 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:53,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840037690] [2020-08-21 18:15:53,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:53,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:53,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:53,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 18:15:53,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840037690] [2020-08-21 18:15:53,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:15:53,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:15:53,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278483736] [2020-08-21 18:15:53,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:15:53,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:53,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:15:53,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:15:53,667 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 5 states. [2020-08-21 18:15:53,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:53,776 INFO L93 Difference]: Finished difference Result 37 states and 40 transitions. [2020-08-21 18:15:53,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:15:53,777 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-08-21 18:15:53,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:53,778 INFO L225 Difference]: With dead ends: 37 [2020-08-21 18:15:53,778 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 18:15:53,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:15:53,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 18:15:53,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 18:15:53,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 18:15:53,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 18:15:53,787 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2020-08-21 18:15:53,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:53,788 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 18:15:53,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:15:53,788 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 18:15:53,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 18:15:53,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:53,789 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] [2020-08-21 18:15:53,790 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:15:53,790 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:53,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:53,790 INFO L82 PathProgramCache]: Analyzing trace with hash 483863630, now seen corresponding path program 1 times [2020-08-21 18:15:53,791 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:53,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754593763] [2020-08-21 18:15:53,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:53,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:54,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:54,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:54,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:54,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754593763] [2020-08-21 18:15:54,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:54,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:15:54,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553524961] [2020-08-21 18:15:54,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:15:54,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:54,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:15:54,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:15:54,335 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 13 states. [2020-08-21 18:15:54,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:54,833 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 18:15:54,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:15:54,834 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2020-08-21 18:15:54,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:54,835 INFO L225 Difference]: With dead ends: 50 [2020-08-21 18:15:54,836 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:15:54,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:15:54,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:15:54,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 39. [2020-08-21 18:15:54,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:15:54,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 18:15:54,847 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-08-21 18:15:54,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:54,848 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 18:15:54,848 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:15:54,848 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 18:15:54,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 18:15:54,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:54,850 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:54,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:15:54,850 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:54,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:54,851 INFO L82 PathProgramCache]: Analyzing trace with hash 714881356, now seen corresponding path program 2 times [2020-08-21 18:15:54,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:54,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669976497] [2020-08-21 18:15:54,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:54,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:54,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:54,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:54,956 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:54,956 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669976497] [2020-08-21 18:15:54,956 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:54,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:15:54,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522253917] [2020-08-21 18:15:54,958 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:15:54,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:54,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:15:54,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:15:54,959 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 7 states. [2020-08-21 18:15:55,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:55,157 INFO L93 Difference]: Finished difference Result 59 states and 65 transitions. [2020-08-21 18:15:55,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:15:55,158 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2020-08-21 18:15:55,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:55,160 INFO L225 Difference]: With dead ends: 59 [2020-08-21 18:15:55,160 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:15:55,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:15:55,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:15:55,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 41. [2020-08-21 18:15:55,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 18:15:55,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 18:15:55,170 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 23 [2020-08-21 18:15:55,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:55,170 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 18:15:55,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:15:55,171 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 18:15:55,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:15:55,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:55,172 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] [2020-08-21 18:15:55,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:15:55,172 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:55,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:55,173 INFO L82 PathProgramCache]: Analyzing trace with hash -163832182, now seen corresponding path program 3 times [2020-08-21 18:15:55,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:55,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [506685169] [2020-08-21 18:15:55,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:55,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:55,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:55,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:55,627 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:55,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [506685169] [2020-08-21 18:15:55,629 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:55,629 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:15:55,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069611178] [2020-08-21 18:15:55,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:15:55,633 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:55,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:15:55,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:15:55,634 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 15 states. [2020-08-21 18:15:56,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:56,534 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2020-08-21 18:15:56,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:15:56,535 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2020-08-21 18:15:56,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:56,538 INFO L225 Difference]: With dead ends: 70 [2020-08-21 18:15:56,538 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 18:15:56,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=171, Invalid=759, Unknown=0, NotChecked=0, Total=930 [2020-08-21 18:15:56,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 18:15:56,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-08-21 18:15:56,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 18:15:56,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 18:15:56,549 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 25 [2020-08-21 18:15:56,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:56,549 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 18:15:56,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:15:56,550 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 18:15:56,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 18:15:56,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:56,551 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:56,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:15:56,551 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:56,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:56,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1352039560, now seen corresponding path program 4 times [2020-08-21 18:15:56,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:56,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1969639858] [2020-08-21 18:15:56,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:56,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:56,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:56,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:56,623 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:56,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1969639858] [2020-08-21 18:15:56,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:56,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:15:56,624 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167798879] [2020-08-21 18:15:56,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:15:56,625 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:56,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:15:56,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:15:56,626 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 18:15:56,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:56,850 INFO L93 Difference]: Finished difference Result 74 states and 83 transitions. [2020-08-21 18:15:56,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:15:56,851 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-08-21 18:15:56,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:56,853 INFO L225 Difference]: With dead ends: 74 [2020-08-21 18:15:56,853 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 18:15:56,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:15:56,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 18:15:56,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 48. [2020-08-21 18:15:56,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 18:15:56,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 18:15:56,864 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 27 [2020-08-21 18:15:56,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:56,864 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 18:15:56,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:15:56,864 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 18:15:56,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 18:15:56,865 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:56,865 INFO L422 BasicCegarLoop]: trace histogram [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 18:15:56,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:15:56,866 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:56,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:56,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1474600187, now seen corresponding path program 1 times [2020-08-21 18:15:56,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:56,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555089151] [2020-08-21 18:15:56,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:56,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:56,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:56,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:56,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-21 18:15:56,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:56,981 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-21 18:15:56,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555089151] [2020-08-21 18:15:56,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:56,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:15:56,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684863637] [2020-08-21 18:15:56,982 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:15:56,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:56,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:15:56,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:15:56,983 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 8 states. [2020-08-21 18:15:57,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:57,117 INFO L93 Difference]: Finished difference Result 75 states and 84 transitions. [2020-08-21 18:15:57,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:15:57,117 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-08-21 18:15:57,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:57,119 INFO L225 Difference]: With dead ends: 75 [2020-08-21 18:15:57,119 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 18:15:57,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:15:57,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 18:15:57,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-08-21 18:15:57,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 18:15:57,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-08-21 18:15:57,136 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 29 [2020-08-21 18:15:57,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:57,136 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-08-21 18:15:57,136 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:15:57,136 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-08-21 18:15:57,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 18:15:57,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:57,143 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] [2020-08-21 18:15:57,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:15:57,143 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:57,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:57,144 INFO L82 PathProgramCache]: Analyzing trace with hash -2035121466, now seen corresponding path program 5 times [2020-08-21 18:15:57,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:57,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169740403] [2020-08-21 18:15:57,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:57,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:57,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:57,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:57,592 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:57,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169740403] [2020-08-21 18:15:57,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:57,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:15:57,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879938844] [2020-08-21 18:15:57,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:15:57,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:57,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:15:57,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:15:57,595 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 17 states. [2020-08-21 18:15:59,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:59,162 INFO L93 Difference]: Finished difference Result 97 states and 109 transitions. [2020-08-21 18:15:59,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 18:15:59,163 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 29 [2020-08-21 18:15:59,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:59,164 INFO L225 Difference]: With dead ends: 97 [2020-08-21 18:15:59,164 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 18:15:59,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=250, Invalid=1556, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 18:15:59,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 18:15:59,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 52. [2020-08-21 18:15:59,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 18:15:59,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2020-08-21 18:15:59,176 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 29 [2020-08-21 18:15:59,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:59,177 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2020-08-21 18:15:59,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:15:59,177 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2020-08-21 18:15:59,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:15:59,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:59,178 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:59,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:15:59,179 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:59,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:59,179 INFO L82 PathProgramCache]: Analyzing trace with hash 1351725508, now seen corresponding path program 6 times [2020-08-21 18:15:59,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:59,180 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777261430] [2020-08-21 18:15:59,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:59,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:59,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:15:59,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:15:59,262 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:15:59,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777261430] [2020-08-21 18:15:59,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:15:59,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:15:59,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183856337] [2020-08-21 18:15:59,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:15:59,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:15:59,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:15:59,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:15:59,265 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 9 states. [2020-08-21 18:15:59,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:15:59,508 INFO L93 Difference]: Finished difference Result 88 states and 99 transitions. [2020-08-21 18:15:59,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:15:59,509 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-21 18:15:59,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:15:59,510 INFO L225 Difference]: With dead ends: 88 [2020-08-21 18:15:59,511 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 18:15:59,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:15:59,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 18:15:59,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 54. [2020-08-21 18:15:59,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 18:15:59,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2020-08-21 18:15:59,522 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 31 [2020-08-21 18:15:59,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:15:59,522 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2020-08-21 18:15:59,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:15:59,523 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2020-08-21 18:15:59,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 18:15:59,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:15:59,524 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:15:59,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:15:59,524 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:15:59,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:15:59,525 INFO L82 PathProgramCache]: Analyzing trace with hash 1316510017, now seen corresponding path program 2 times [2020-08-21 18:15:59,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:15:59,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349732484] [2020-08-21 18:15:59,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:15:59,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:15:59,547 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:15:59,547 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:15:59,552 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:15:59,573 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:15:59 BoogieIcfgContainer [2020-08-21 18:15:59,573 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:15:59,576 INFO L168 Benchmark]: Toolchain (without parser) took 7553.08 ms. Allocated memory was 139.5 MB in the beginning and 306.2 MB in the end (delta: 166.7 MB). Free memory was 102.2 MB in the beginning and 230.5 MB in the end (delta: -128.3 MB). Peak memory consumption was 38.4 MB. Max. memory is 7.1 GB. [2020-08-21 18:15:59,577 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 18:15:59,578 INFO L168 Benchmark]: CACSL2BoogieTranslator took 308.49 ms. Allocated memory is still 139.5 MB. Free memory was 102.0 MB in the beginning and 91.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:15:59,579 INFO L168 Benchmark]: Boogie Preprocessor took 116.15 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 91.7 MB in the beginning and 179.2 MB in the end (delta: -87.5 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-21 18:15:59,580 INFO L168 Benchmark]: RCFGBuilder took 339.84 ms. Allocated memory is still 201.9 MB. Free memory was 179.2 MB in the beginning and 162.7 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:15:59,581 INFO L168 Benchmark]: TraceAbstraction took 6783.21 ms. Allocated memory was 201.9 MB in the beginning and 306.2 MB in the end (delta: 104.3 MB). Free memory was 162.1 MB in the beginning and 230.5 MB in the end (delta: -68.4 MB). Peak memory consumption was 35.9 MB. Max. memory is 7.1 GB. [2020-08-21 18:15:59,584 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 308.49 ms. Allocated memory is still 139.5 MB. Free memory was 102.0 MB in the beginning and 91.7 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 116.15 ms. Allocated memory was 139.5 MB in the beginning and 201.9 MB in the end (delta: 62.4 MB). Free memory was 91.7 MB in the beginning and 179.2 MB in the end (delta: -87.5 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 339.84 ms. Allocated memory is still 201.9 MB. Free memory was 179.2 MB in the beginning and 162.7 MB in the end (delta: 16.5 MB). Peak memory consumption was 16.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6783.21 ms. Allocated memory was 201.9 MB in the beginning and 306.2 MB in the end (delta: 104.3 MB). Free memory was 162.1 MB in the beginning and 230.5 MB in the end (delta: -68.4 MB). Peak memory consumption was 35.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L14] int MAX = __VERIFIER_nondet_uint(); [L15] COND FALSE !(!(MAX > 0)) [L16] char str1[MAX], str2[MAX]; [L17] int cont, i, j; [L18] cont = 0 [L20] i=0 [L20] COND TRUE i= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND TRUE i >= 0 [L28] EXPR str1[0] [L28] str2[j] = str1[0] [L29] j++ [L27] i-- [L27] COND FALSE !(i >= 0) [L32] j = MAX-1 [L33] i=0 [L33] COND TRUE i