/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=HIGHLEXORDER --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 19:04:15,805 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 19:04:15,807 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 19:04:15,830 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 19:04:15,831 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 19:04:15,832 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 19:04:15,833 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 19:04:15,835 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 19:04:15,836 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 19:04:15,837 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 19:04:15,838 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 19:04:15,839 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 19:04:15,839 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 19:04:15,841 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 19:04:15,842 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 19:04:15,843 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 19:04:15,843 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 19:04:15,844 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 19:04:15,846 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 19:04:15,848 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 19:04:15,850 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 19:04:15,851 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 19:04:15,852 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 19:04:15,853 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 19:04:15,856 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 19:04:15,864 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 19:04:15,865 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 19:04:15,866 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 19:04:15,867 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 19:04:15,903 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 19:04:15,903 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 19:04:15,905 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 19:04:15,905 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 19:04:15,906 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 19:04:15,906 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 19:04:15,907 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 19:04:15,907 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 19:04:15,907 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 19:04:15,907 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 19:04:15,907 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 19:04:15,907 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 19:04:15,908 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 19:04:15,908 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 19:04:15,908 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 19:04:15,908 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 19:04:15,908 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 19:04:15,909 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 19:04:15,910 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 19:04:15,910 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 19:04:15,910 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 19:04:15,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 19:04:15,911 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 19:04:15,911 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 19:04:15,911 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 19:04:15,912 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 19:04:15,912 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 19:04:15,912 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 19:04:15,912 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 19:04:15,912 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=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 19:04:16,200 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 19:04:16,215 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 19:04:16,221 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 19:04:16,222 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 19:04:16,223 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 19:04:16,224 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-1.i [2020-08-21 19:04:16,302 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0ad0cf725/ee97ad0ee65140d4817e0ed241112452/FLAG7a4ada300 [2020-08-21 19:04:16,773 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 19:04:16,774 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/string-1.i [2020-08-21 19:04:16,781 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0ad0cf725/ee97ad0ee65140d4817e0ed241112452/FLAG7a4ada300 [2020-08-21 19:04:17,133 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0ad0cf725/ee97ad0ee65140d4817e0ed241112452 [2020-08-21 19:04:17,141 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 19:04:17,143 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 19:04:17,143 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:17,144 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 19:04:17,147 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 19:04:17,148 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,151 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2234316 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17, skipping insertion in model container [2020-08-21 19:04:17,152 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,159 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 19:04:17,179 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 19:04:17,376 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:17,380 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 19:04:17,409 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 19:04:17,431 INFO L208 MainTranslator]: Completed translation [2020-08-21 19:04:17,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17 WrapperNode [2020-08-21 19:04:17,432 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 19:04:17,433 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 19:04:17,433 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 19:04:17,433 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 19:04:17,525 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,535 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,536 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,549 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,556 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,558 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (1/1) ... [2020-08-21 19:04:17,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 19:04:17,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 19:04:17,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 19:04:17,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 19:04:17,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (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 19:04:17,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 19:04:17,624 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 19:04:17,624 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 19:04:17,624 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 19:04:17,625 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 19:04:17,625 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 19:04:17,625 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 19:04:17,625 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 19:04:17,625 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 19:04:17,626 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-08-21 19:04:17,626 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 19:04:17,626 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 19:04:17,626 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 19:04:17,626 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 19:04:17,626 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 19:04:17,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 19:04:17,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 19:04:17,939 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 19:04:17,940 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-08-21 19:04:17,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:17 BoogieIcfgContainer [2020-08-21 19:04:17,945 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 19:04:17,947 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 19:04:17,947 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 19:04:17,950 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 19:04:17,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 07:04:17" (1/3) ... [2020-08-21 19:04:17,952 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aee15cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:17, skipping insertion in model container [2020-08-21 19:04:17,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 07:04:17" (2/3) ... [2020-08-21 19:04:17,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2aee15cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 07:04:17, skipping insertion in model container [2020-08-21 19:04:17,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 07:04:17" (3/3) ... [2020-08-21 19:04:17,955 INFO L109 eAbstractionObserver]: Analyzing ICFG string-1.i [2020-08-21 19:04:17,968 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 19:04:17,976 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 19:04:17,992 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 19:04:18,020 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 19:04:18,020 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 19:04:18,020 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 19:04:18,020 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 19:04:18,021 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 19:04:18,021 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 19:04:18,021 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 19:04:18,021 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 19:04:18,041 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-08-21 19:04:18,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 19:04:18,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:18,048 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 19:04:18,048 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:18,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:18,063 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-08-21 19:04:18,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:18,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77159629] [2020-08-21 19:04:18,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:18,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:18,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:18,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:18,292 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 19:04:18,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77159629] [2020-08-21 19:04:18,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:18,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 19:04:18,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116922088] [2020-08-21 19:04:18,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 19:04:18,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:18,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 19:04:18,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 19:04:18,315 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 4 states. [2020-08-21 19:04:18,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:18,489 INFO L93 Difference]: Finished difference Result 73 states and 109 transitions. [2020-08-21 19:04:18,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 19:04:18,491 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 22 [2020-08-21 19:04:18,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:18,502 INFO L225 Difference]: With dead ends: 73 [2020-08-21 19:04:18,503 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 19:04:18,507 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 19:04:18,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 19:04:18,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-08-21 19:04:18,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 19:04:18,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-08-21 19:04:18,553 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 22 [2020-08-21 19:04:18,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:18,554 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-08-21 19:04:18,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 19:04:18,554 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-08-21 19:04:18,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 19:04:18,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:18,556 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 19:04:18,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 19:04:18,556 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:18,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:18,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-08-21 19:04:18,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:18,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760323333] [2020-08-21 19:04:18,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:18,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:18,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:18,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:18,660 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 19:04:18,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760323333] [2020-08-21 19:04:18,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:18,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 19:04:18,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669976497] [2020-08-21 19:04:18,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:04:18,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:18,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:04:18,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:18,670 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 5 states. [2020-08-21 19:04:18,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:18,803 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-08-21 19:04:18,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:04:18,804 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 28 [2020-08-21 19:04:18,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:18,806 INFO L225 Difference]: With dead ends: 65 [2020-08-21 19:04:18,806 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 19:04:18,807 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 19:04:18,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 19:04:18,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34. [2020-08-21 19:04:18,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 19:04:18,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-08-21 19:04:18,816 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-08-21 19:04:18,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:18,817 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-08-21 19:04:18,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:04:18,817 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-08-21 19:04:18,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 19:04:18,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:18,819 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 19:04:18,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 19:04:18,819 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:18,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:18,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1067646812, now seen corresponding path program 2 times [2020-08-21 19:04:18,820 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:18,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [54086745] [2020-08-21 19:04:18,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:18,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:18,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:18,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:18,934 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 19:04:18,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [54086745] [2020-08-21 19:04:18,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:18,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 19:04:18,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778854032] [2020-08-21 19:04:18,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 19:04:18,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:18,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 19:04:18,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 19:04:18,937 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 6 states. [2020-08-21 19:04:19,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:19,083 INFO L93 Difference]: Finished difference Result 75 states and 92 transitions. [2020-08-21 19:04:19,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 19:04:19,084 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2020-08-21 19:04:19,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:19,085 INFO L225 Difference]: With dead ends: 75 [2020-08-21 19:04:19,085 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 19:04:19,086 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 19:04:19,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 19:04:19,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 38. [2020-08-21 19:04:19,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 19:04:19,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-08-21 19:04:19,094 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-08-21 19:04:19,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:19,094 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-08-21 19:04:19,095 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 19:04:19,095 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-08-21 19:04:19,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 19:04:19,096 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:19,096 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 19:04:19,096 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 19:04:19,097 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:19,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:19,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1245957476, now seen corresponding path program 3 times [2020-08-21 19:04:19,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:19,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929290596] [2020-08-21 19:04:19,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:19,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:19,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,197 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 19:04:19,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929290596] [2020-08-21 19:04:19,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:19,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:04:19,200 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106937462] [2020-08-21 19:04:19,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:04:19,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:19,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:04:19,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:19,202 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 7 states. [2020-08-21 19:04:19,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:19,350 INFO L93 Difference]: Finished difference Result 85 states and 104 transitions. [2020-08-21 19:04:19,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:04:19,357 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 36 [2020-08-21 19:04:19,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:19,358 INFO L225 Difference]: With dead ends: 85 [2020-08-21 19:04:19,358 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 19:04:19,359 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 19:04:19,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 19:04:19,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 42. [2020-08-21 19:04:19,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 19:04:19,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-08-21 19:04:19,367 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-08-21 19:04:19,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:19,367 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-08-21 19:04:19,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:04:19,367 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-08-21 19:04:19,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 19:04:19,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:19,369 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 19:04:19,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 19:04:19,369 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:19,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:19,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 4 times [2020-08-21 19:04:19,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:19,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926812975] [2020-08-21 19:04:19,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:19,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:19,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,482 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 19:04:19,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926812975] [2020-08-21 19:04:19,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:19,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:04:19,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962397882] [2020-08-21 19:04:19,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:04:19,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:19,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:04:19,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:19,485 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 8 states. [2020-08-21 19:04:19,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:19,628 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-08-21 19:04:19,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:04:19,629 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 40 [2020-08-21 19:04:19,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:19,630 INFO L225 Difference]: With dead ends: 93 [2020-08-21 19:04:19,630 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 19:04:19,631 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 19:04:19,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 19:04:19,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-08-21 19:04:19,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 19:04:19,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-08-21 19:04:19,638 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-08-21 19:04:19,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:19,639 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-08-21 19:04:19,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:04:19,639 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-08-21 19:04:19,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 19:04:19,641 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:19,641 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 19:04:19,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 19:04:19,641 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:19,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:19,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 5 times [2020-08-21 19:04:19,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:19,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2147251828] [2020-08-21 19:04:19,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:19,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:19,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:19,833 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 19:04:19,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2147251828] [2020-08-21 19:04:19,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:19,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-08-21 19:04:19,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546440393] [2020-08-21 19:04:19,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:04:19,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:19,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:04:19,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:19,836 INFO L87 Difference]: Start difference. First operand 46 states and 51 transitions. Second operand 8 states. [2020-08-21 19:04:19,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:19,964 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 19:04:19,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 19:04:19,964 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 44 [2020-08-21 19:04:19,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:19,966 INFO L225 Difference]: With dead ends: 62 [2020-08-21 19:04:19,968 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 19:04:19,969 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 19:04:19,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 19:04:19,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 19:04:19,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 19:04:19,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 53 transitions. [2020-08-21 19:04:19,985 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 53 transitions. Word has length 44 [2020-08-21 19:04:19,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:19,986 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 53 transitions. [2020-08-21 19:04:19,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:04:19,988 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 53 transitions. [2020-08-21 19:04:19,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 19:04:19,989 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:19,989 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 19:04:19,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 19:04:19,990 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:19,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:19,990 INFO L82 PathProgramCache]: Analyzing trace with hash -637010121, now seen corresponding path program 1 times [2020-08-21 19:04:19,991 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:19,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687620104] [2020-08-21 19:04:19,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:20,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:20,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,147 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 19:04:20,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687620104] [2020-08-21 19:04:20,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:20,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:04:20,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909065027] [2020-08-21 19:04:20,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:04:20,149 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:20,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:04:20,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:04:20,149 INFO L87 Difference]: Start difference. First operand 48 states and 53 transitions. Second operand 9 states. [2020-08-21 19:04:20,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:20,313 INFO L93 Difference]: Finished difference Result 55 states and 60 transitions. [2020-08-21 19:04:20,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:04:20,314 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2020-08-21 19:04:20,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:20,315 INFO L225 Difference]: With dead ends: 55 [2020-08-21 19:04:20,315 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 19:04:20,316 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 19:04:20,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 19:04:20,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 19:04:20,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 19:04:20,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 19:04:20,322 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 46 [2020-08-21 19:04:20,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:20,323 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 19:04:20,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:04:20,323 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 19:04:20,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 19:04:20,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:20,324 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 19:04:20,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 19:04:20,325 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:20,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:20,325 INFO L82 PathProgramCache]: Analyzing trace with hash -1604149734, now seen corresponding path program 1 times [2020-08-21 19:04:20,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:20,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [736361035] [2020-08-21 19:04:20,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:20,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:20,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,389 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 19:04:20,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [736361035] [2020-08-21 19:04:20,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 19:04:20,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 19:04:20,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536993901] [2020-08-21 19:04:20,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 19:04:20,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:20,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 19:04:20,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 19:04:20,392 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 19:04:20,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:20,443 INFO L93 Difference]: Finished difference Result 67 states and 75 transitions. [2020-08-21 19:04:20,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 19:04:20,443 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 19:04:20,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:20,444 INFO L225 Difference]: With dead ends: 67 [2020-08-21 19:04:20,444 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 19:04:20,445 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 19:04:20,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 19:04:20,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 19:04:20,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 19:04:20,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 56 transitions. [2020-08-21 19:04:20,451 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 56 transitions. Word has length 48 [2020-08-21 19:04:20,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:20,452 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 56 transitions. [2020-08-21 19:04:20,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 19:04:20,452 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 56 transitions. [2020-08-21 19:04:20,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 19:04:20,453 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:20,453 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 19:04:20,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 19:04:20,454 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:20,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:20,454 INFO L82 PathProgramCache]: Analyzing trace with hash 855134175, now seen corresponding path program 1 times [2020-08-21 19:04:20,454 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:20,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579362592] [2020-08-21 19:04:20,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:20,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:20,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,588 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 19:04:20,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579362592] [2020-08-21 19:04:20,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:20,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:04:20,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726492095] [2020-08-21 19:04:20,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:04:20,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:20,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:04:20,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:04:20,591 INFO L87 Difference]: Start difference. First operand 51 states and 56 transitions. Second operand 10 states. [2020-08-21 19:04:20,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:20,752 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2020-08-21 19:04:20,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 19:04:20,753 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 50 [2020-08-21 19:04:20,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:20,754 INFO L225 Difference]: With dead ends: 70 [2020-08-21 19:04:20,754 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 19:04:20,755 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 19:04:20,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 19:04:20,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 19:04:20,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 19:04:20,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 58 transitions. [2020-08-21 19:04:20,761 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 58 transitions. Word has length 50 [2020-08-21 19:04:20,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:20,762 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 58 transitions. [2020-08-21 19:04:20,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:04:20,762 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 58 transitions. [2020-08-21 19:04:20,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 19:04:20,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:20,763 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 19:04:20,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 19:04:20,764 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:20,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:20,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1926047290, now seen corresponding path program 2 times [2020-08-21 19:04:20,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:20,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006685527] [2020-08-21 19:04:20,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:20,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:20,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:20,929 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 19:04:20,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006685527] [2020-08-21 19:04:20,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:20,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:04:20,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046777141] [2020-08-21 19:04:20,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:04:20,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:20,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:04:20,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:04:20,933 INFO L87 Difference]: Start difference. First operand 53 states and 58 transitions. Second operand 11 states. [2020-08-21 19:04:21,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:21,146 INFO L93 Difference]: Finished difference Result 61 states and 67 transitions. [2020-08-21 19:04:21,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:04:21,147 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 52 [2020-08-21 19:04:21,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:21,148 INFO L225 Difference]: With dead ends: 61 [2020-08-21 19:04:21,148 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 19:04:21,151 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 19:04:21,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 19:04:21,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 19:04:21,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 19:04:21,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2020-08-21 19:04:21,159 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 52 [2020-08-21 19:04:21,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:21,159 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2020-08-21 19:04:21,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:04:21,160 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2020-08-21 19:04:21,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 19:04:21,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:21,161 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 19:04:21,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 19:04:21,161 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:21,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:21,161 INFO L82 PathProgramCache]: Analyzing trace with hash 477761629, now seen corresponding path program 3 times [2020-08-21 19:04:21,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:21,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289367747] [2020-08-21 19:04:21,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:21,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:21,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,262 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 19:04:21,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289367747] [2020-08-21 19:04:21,263 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:21,263 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 19:04:21,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745643619] [2020-08-21 19:04:21,264 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 19:04:21,264 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:21,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 19:04:21,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-08-21 19:04:21,265 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 7 states. [2020-08-21 19:04:21,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:21,347 INFO L93 Difference]: Finished difference Result 86 states and 100 transitions. [2020-08-21 19:04:21,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:04:21,347 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 54 [2020-08-21 19:04:21,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:21,348 INFO L225 Difference]: With dead ends: 86 [2020-08-21 19:04:21,348 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 19:04:21,349 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 19:04:21,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 19:04:21,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 67. [2020-08-21 19:04:21,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 19:04:21,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 75 transitions. [2020-08-21 19:04:21,363 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 75 transitions. Word has length 54 [2020-08-21 19:04:21,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:21,363 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 75 transitions. [2020-08-21 19:04:21,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 19:04:21,363 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 75 transitions. [2020-08-21 19:04:21,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:04:21,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:21,366 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 19:04:21,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 19:04:21,367 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:21,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:21,369 INFO L82 PathProgramCache]: Analyzing trace with hash 945709890, now seen corresponding path program 1 times [2020-08-21 19:04:21,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:21,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80547219] [2020-08-21 19:04:21,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:21,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:21,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,474 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 19:04:21,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80547219] [2020-08-21 19:04:21,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:21,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 19:04:21,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787037481] [2020-08-21 19:04:21,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 19:04:21,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:21,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 19:04:21,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 19:04:21,476 INFO L87 Difference]: Start difference. First operand 67 states and 75 transitions. Second operand 8 states. [2020-08-21 19:04:21,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:21,576 INFO L93 Difference]: Finished difference Result 79 states and 89 transitions. [2020-08-21 19:04:21,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 19:04:21,577 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 56 [2020-08-21 19:04:21,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:21,578 INFO L225 Difference]: With dead ends: 79 [2020-08-21 19:04:21,578 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 19:04:21,580 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 19:04:21,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 19:04:21,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 19:04:21,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 19:04:21,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 63 transitions. [2020-08-21 19:04:21,586 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 63 transitions. Word has length 56 [2020-08-21 19:04:21,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:21,587 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 63 transitions. [2020-08-21 19:04:21,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 19:04:21,587 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 63 transitions. [2020-08-21 19:04:21,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 19:04:21,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:21,588 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 19:04:21,588 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 19:04:21,588 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:21,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:21,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1888314782, now seen corresponding path program 4 times [2020-08-21 19:04:21,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:21,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929323056] [2020-08-21 19:04:21,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:21,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:21,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:21,718 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 19:04:21,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929323056] [2020-08-21 19:04:21,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:21,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 19:04:21,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049024703] [2020-08-21 19:04:21,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 19:04:21,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:21,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 19:04:21,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-08-21 19:04:21,720 INFO L87 Difference]: Start difference. First operand 57 states and 63 transitions. Second operand 12 states. [2020-08-21 19:04:21,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:21,917 INFO L93 Difference]: Finished difference Result 80 states and 92 transitions. [2020-08-21 19:04:21,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 19:04:21,918 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 56 [2020-08-21 19:04:21,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:21,919 INFO L225 Difference]: With dead ends: 80 [2020-08-21 19:04:21,919 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 19:04:21,920 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 19:04:21,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 19:04:21,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-21 19:04:21,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 19:04:21,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 65 transitions. [2020-08-21 19:04:21,929 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 65 transitions. Word has length 56 [2020-08-21 19:04:21,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:21,929 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 65 transitions. [2020-08-21 19:04:21,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 19:04:21,930 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 65 transitions. [2020-08-21 19:04:21,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 19:04:21,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:21,932 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 19:04:21,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 19:04:21,933 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:21,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:21,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1242276355, now seen corresponding path program 5 times [2020-08-21 19:04:21,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:21,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1872080965] [2020-08-21 19:04:21,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:21,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,072 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 19:04:22,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1872080965] [2020-08-21 19:04:22,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:22,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:04:22,073 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196949721] [2020-08-21 19:04:22,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:04:22,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:04:22,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:04:22,075 INFO L87 Difference]: Start difference. First operand 59 states and 65 transitions. Second operand 13 states. [2020-08-21 19:04:22,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,351 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2020-08-21 19:04:22,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:04:22,352 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 58 [2020-08-21 19:04:22,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,353 INFO L225 Difference]: With dead ends: 67 [2020-08-21 19:04:22,353 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 19:04:22,354 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 19:04:22,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 19:04:22,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 19:04:22,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 19:04:22,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2020-08-21 19:04:22,359 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 58 [2020-08-21 19:04:22,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,359 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2020-08-21 19:04:22,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:04:22,360 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2020-08-21 19:04:22,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 19:04:22,360 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,360 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 19:04:22,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 19:04:22,361 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,361 INFO L82 PathProgramCache]: Analyzing trace with hash 850551648, now seen corresponding path program 6 times [2020-08-21 19:04:22,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400752497] [2020-08-21 19:04:22,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,433 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 19:04:22,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400752497] [2020-08-21 19:04:22,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:22,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 19:04:22,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522416252] [2020-08-21 19:04:22,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 19:04:22,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 19:04:22,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 19:04:22,436 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand 9 states. [2020-08-21 19:04:22,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,568 INFO L93 Difference]: Finished difference Result 100 states and 118 transitions. [2020-08-21 19:04:22,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:04:22,569 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 60 [2020-08-21 19:04:22,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,570 INFO L225 Difference]: With dead ends: 100 [2020-08-21 19:04:22,570 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 19:04:22,571 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 19:04:22,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 19:04:22,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 77. [2020-08-21 19:04:22,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 19:04:22,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 87 transitions. [2020-08-21 19:04:22,579 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 87 transitions. Word has length 60 [2020-08-21 19:04:22,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,579 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 87 transitions. [2020-08-21 19:04:22,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 19:04:22,579 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 87 transitions. [2020-08-21 19:04:22,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 19:04:22,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,580 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 19:04:22,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 19:04:22,581 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1426761989, now seen corresponding path program 2 times [2020-08-21 19:04:22,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912825270] [2020-08-21 19:04:22,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,671 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 19:04:22,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912825270] [2020-08-21 19:04:22,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:22,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:04:22,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136050969] [2020-08-21 19:04:22,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:04:22,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:04:22,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:04:22,674 INFO L87 Difference]: Start difference. First operand 77 states and 87 transitions. Second operand 10 states. [2020-08-21 19:04:22,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:22,795 INFO L93 Difference]: Finished difference Result 102 states and 120 transitions. [2020-08-21 19:04:22,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:04:22,796 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 62 [2020-08-21 19:04:22,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:22,797 INFO L225 Difference]: With dead ends: 102 [2020-08-21 19:04:22,797 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 19:04:22,798 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 19:04:22,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 19:04:22,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 79. [2020-08-21 19:04:22,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 19:04:22,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2020-08-21 19:04:22,807 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 62 [2020-08-21 19:04:22,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:22,807 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2020-08-21 19:04:22,807 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:04:22,807 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2020-08-21 19:04:22,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 19:04:22,808 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:22,808 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 19:04:22,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 19:04:22,809 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:22,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:22,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1340435035, now seen corresponding path program 7 times [2020-08-21 19:04:22,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:22,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523288415] [2020-08-21 19:04:22,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:22,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:22,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:22,949 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 19:04:22,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523288415] [2020-08-21 19:04:22,950 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:22,950 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 19:04:22,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343525313] [2020-08-21 19:04:22,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 19:04:22,951 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:22,951 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 19:04:22,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:04:22,952 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand 14 states. [2020-08-21 19:04:23,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,216 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-08-21 19:04:23,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 19:04:23,217 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2020-08-21 19:04:23,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,218 INFO L225 Difference]: With dead ends: 115 [2020-08-21 19:04:23,219 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 19:04:23,220 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 19:04:23,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 19:04:23,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2020-08-21 19:04:23,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 19:04:23,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2020-08-21 19:04:23,229 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 62 [2020-08-21 19:04:23,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,229 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2020-08-21 19:04:23,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 19:04:23,230 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2020-08-21 19:04:23,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 19:04:23,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,231 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 19:04:23,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 19:04:23,232 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,232 INFO L82 PathProgramCache]: Analyzing trace with hash -1186490752, now seen corresponding path program 8 times [2020-08-21 19:04:23,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523550242] [2020-08-21 19:04:23,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,382 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 19:04:23,383 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523550242] [2020-08-21 19:04:23,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:23,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 19:04:23,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328858172] [2020-08-21 19:04:23,384 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 19:04:23,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 19:04:23,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 19:04:23,385 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand 15 states. [2020-08-21 19:04:23,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:23,748 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2020-08-21 19:04:23,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:04:23,748 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 64 [2020-08-21 19:04:23,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:23,749 INFO L225 Difference]: With dead ends: 91 [2020-08-21 19:04:23,749 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 19:04:23,750 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 19:04:23,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 19:04:23,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 19:04:23,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 19:04:23,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 96 transitions. [2020-08-21 19:04:23,757 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 96 transitions. Word has length 64 [2020-08-21 19:04:23,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:23,757 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 96 transitions. [2020-08-21 19:04:23,757 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 19:04:23,757 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 96 transitions. [2020-08-21 19:04:23,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 19:04:23,758 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:23,758 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 19:04:23,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 19:04:23,758 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:23,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:23,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1374058717, now seen corresponding path program 9 times [2020-08-21 19:04:23,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:23,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011723260] [2020-08-21 19:04:23,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:23,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:23,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:23,844 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 19:04:23,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011723260] [2020-08-21 19:04:23,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:23,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:04:23,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109962331] [2020-08-21 19:04:23,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:04:23,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:23,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:04:23,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:04:23,846 INFO L87 Difference]: Start difference. First operand 85 states and 96 transitions. Second operand 11 states. [2020-08-21 19:04:24,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:24,021 INFO L93 Difference]: Finished difference Result 143 states and 173 transitions. [2020-08-21 19:04:24,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:04:24,022 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 66 [2020-08-21 19:04:24,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:24,023 INFO L225 Difference]: With dead ends: 143 [2020-08-21 19:04:24,023 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 19:04:24,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=62, Invalid=178, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:04:24,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 19:04:24,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 103. [2020-08-21 19:04:24,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 19:04:24,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 118 transitions. [2020-08-21 19:04:24,033 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 118 transitions. Word has length 66 [2020-08-21 19:04:24,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:24,033 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 118 transitions. [2020-08-21 19:04:24,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:04:24,034 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 118 transitions. [2020-08-21 19:04:24,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 19:04:24,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:24,034 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 19:04:24,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 19:04:24,035 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:24,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:24,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2063125144, now seen corresponding path program 3 times [2020-08-21 19:04:24,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:24,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936650790] [2020-08-21 19:04:24,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:24,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:24,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,115 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 19:04:24,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936650790] [2020-08-21 19:04:24,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:24,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 19:04:24,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484735381] [2020-08-21 19:04:24,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 19:04:24,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:24,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 19:04:24,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-21 19:04:24,117 INFO L87 Difference]: Start difference. First operand 103 states and 118 transitions. Second operand 10 states. [2020-08-21 19:04:24,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:24,256 INFO L93 Difference]: Finished difference Result 121 states and 140 transitions. [2020-08-21 19:04:24,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 19:04:24,257 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-08-21 19:04:24,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:24,258 INFO L225 Difference]: With dead ends: 121 [2020-08-21 19:04:24,258 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 19:04:24,259 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 19:04:24,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 19:04:24,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 87. [2020-08-21 19:04:24,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 19:04:24,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 99 transitions. [2020-08-21 19:04:24,268 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 99 transitions. Word has length 68 [2020-08-21 19:04:24,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:24,269 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 99 transitions. [2020-08-21 19:04:24,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 19:04:24,269 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 99 transitions. [2020-08-21 19:04:24,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 19:04:24,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:24,270 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 19:04:24,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 19:04:24,271 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:24,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:24,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1776856968, now seen corresponding path program 4 times [2020-08-21 19:04:24,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:24,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937769772] [2020-08-21 19:04:24,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:24,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:24,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,424 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 19:04:24,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937769772] [2020-08-21 19:04:24,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:24,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 19:04:24,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224981723] [2020-08-21 19:04:24,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 19:04:24,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:24,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 19:04:24,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-08-21 19:04:24,428 INFO L87 Difference]: Start difference. First operand 87 states and 99 transitions. Second operand 11 states. [2020-08-21 19:04:24,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:24,607 INFO L93 Difference]: Finished difference Result 118 states and 141 transitions. [2020-08-21 19:04:24,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 19:04:24,608 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 68 [2020-08-21 19:04:24,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:24,609 INFO L225 Difference]: With dead ends: 118 [2020-08-21 19:04:24,609 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 19:04:24,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2020-08-21 19:04:24,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 19:04:24,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 91. [2020-08-21 19:04:24,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 19:04:24,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2020-08-21 19:04:24,619 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 68 [2020-08-21 19:04:24,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:24,620 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2020-08-21 19:04:24,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 19:04:24,620 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2020-08-21 19:04:24,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 19:04:24,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:24,621 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 19:04:24,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 19:04:24,621 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:24,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:24,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1222495832, now seen corresponding path program 10 times [2020-08-21 19:04:24,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:24,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111684294] [2020-08-21 19:04:24,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:24,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:24,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:24,776 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 19:04:24,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111684294] [2020-08-21 19:04:24,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:24,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 19:04:24,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206151079] [2020-08-21 19:04:24,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 19:04:24,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:24,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 19:04:24,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2020-08-21 19:04:24,779 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand 16 states. [2020-08-21 19:04:25,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:25,047 INFO L93 Difference]: Finished difference Result 135 states and 162 transitions. [2020-08-21 19:04:25,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 19:04:25,048 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 68 [2020-08-21 19:04:25,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:25,049 INFO L225 Difference]: With dead ends: 135 [2020-08-21 19:04:25,049 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 19:04:25,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2020-08-21 19:04:25,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 19:04:25,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2020-08-21 19:04:25,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 19:04:25,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 108 transitions. [2020-08-21 19:04:25,058 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 108 transitions. Word has length 68 [2020-08-21 19:04:25,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:25,058 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 108 transitions. [2020-08-21 19:04:25,058 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 19:04:25,058 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 108 transitions. [2020-08-21 19:04:25,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 19:04:25,059 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 19:04:25,059 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 19:04:25,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 19:04:25,060 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 19:04:25,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 19:04:25,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1314701251, now seen corresponding path program 11 times [2020-08-21 19:04:25,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 19:04:25,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846097050] [2020-08-21 19:04:25,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 19:04:25,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:25,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 19:04:25,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 19:04:25,421 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 19:04:25,431 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846097050] [2020-08-21 19:04:25,431 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 19:04:25,431 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 19:04:25,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704619940] [2020-08-21 19:04:25,432 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 19:04:25,432 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 19:04:25,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 19:04:25,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-08-21 19:04:25,433 INFO L87 Difference]: Start difference. First operand 95 states and 108 transitions. Second operand 13 states. [2020-08-21 19:04:25,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 19:04:25,620 INFO L93 Difference]: Finished difference Result 95 states and 108 transitions. [2020-08-21 19:04:25,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 19:04:25,620 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 70 [2020-08-21 19:04:25,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 19:04:25,620 INFO L225 Difference]: With dead ends: 95 [2020-08-21 19:04:25,621 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 19:04:25,621 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 19:04:25,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 19:04:25,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 19:04:25,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 19:04:25,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 19:04:25,623 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 70 [2020-08-21 19:04:25,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 19:04:25,624 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 19:04:25,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 19:04:25,624 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 19:04:25,624 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 19:04:25,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 19:04:25,628 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 19:04:25,889 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 136 [2020-08-21 19:04:27,241 WARN L193 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 132 DAG size of output: 63 [2020-08-21 19:04:27,363 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 28 [2020-08-21 19:04:27,560 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 25 [2020-08-21 19:04:27,564 INFO L268 CegarLoopResult]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2020-08-21 19:04:27,565 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 19:04:27,565 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 19:04:27,565 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 19:04:27,565 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 19:04:27,565 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 19:04:27,565 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 19:04:27,566 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 4 6) no Hoare annotation was computed. [2020-08-21 19:04:27,566 INFO L268 CegarLoopResult]: For program point L5(line 5) no Hoare annotation was computed. [2020-08-21 19:04:27,566 INFO L268 CegarLoopResult]: For program point L5-2(lines 4 6) no Hoare annotation was computed. [2020-08-21 19:04:27,566 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 4 6) no Hoare annotation was computed. [2020-08-21 19:04:27,566 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 19:04:27,567 INFO L268 CegarLoopResult]: For program point L35-4(lines 18 61) no Hoare annotation was computed. [2020-08-21 19:04:27,567 INFO L268 CegarLoopResult]: For program point L31-1(lines 31 32) no Hoare annotation was computed. [2020-08-21 19:04:27,567 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 19:04:27,567 INFO L268 CegarLoopResult]: For program point L31-4(lines 31 32) no Hoare annotation was computed. [2020-08-21 19:04:27,567 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 61) no Hoare annotation was computed. [2020-08-21 19:04:27,568 INFO L268 CegarLoopResult]: For program point L44(lines 44 53) no Hoare annotation was computed. [2020-08-21 19:04:27,568 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 19:04:27,568 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 19:04:27,568 INFO L268 CegarLoopResult]: For program point L24(line 24) no Hoare annotation was computed. [2020-08-21 19:04:27,569 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 19:04:27,569 INFO L268 CegarLoopResult]: For program point L58-1(line 58) no Hoare annotation was computed. [2020-08-21 19:04:27,569 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 17 61) no Hoare annotation was computed. [2020-08-21 19:04:27,569 INFO L268 CegarLoopResult]: For program point L42-2(lines 42 54) no Hoare annotation was computed. [2020-08-21 19:04:27,569 INFO L264 CegarLoopResult]: At program point mainENTRY(lines 17 61) the Hoare annotation is: (= |old(#valid)| |#valid|) [2020-08-21 19:04:27,569 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 27) no Hoare annotation was computed. [2020-08-21 19:04:27,569 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 19:04:27,569 INFO L268 CegarLoopResult]: For program point L26-4(lines 26 27) no Hoare annotation was computed. [2020-08-21 19:04:27,569 INFO L268 CegarLoopResult]: For program point L22-2(lines 22 23) no Hoare annotation was computed. [2020-08-21 19:04:27,569 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 19:04:27,570 INFO L268 CegarLoopResult]: For program point L22-4(lines 22 23) no Hoare annotation was computed. [2020-08-21 19:04:27,570 INFO L268 CegarLoopResult]: For program point L35-1(lines 35 36) no Hoare annotation was computed. [2020-08-21 19:04:27,570 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 7 12) the Hoare annotation is: true [2020-08-21 19:04:27,570 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 7 12) no Hoare annotation was computed. [2020-08-21 19:04:27,570 INFO L268 CegarLoopResult]: For program point L9(line 9) no Hoare annotation was computed. [2020-08-21 19:04:27,570 INFO L268 CegarLoopResult]: For program point L8(lines 8 10) no Hoare annotation was computed. [2020-08-21 19:04:27,570 INFO L268 CegarLoopResult]: For program point L8-2(lines 7 12) no Hoare annotation was computed. [2020-08-21 19:04:27,570 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 9) no Hoare annotation was computed. [2020-08-21 19:04:27,580 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,584 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,591 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,592 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,593 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,593 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,595 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 07:04:27 BoogieIcfgContainer [2020-08-21 19:04:27,595 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 19:04:27,597 INFO L168 Benchmark]: Toolchain (without parser) took 10454.90 ms. Allocated memory was 140.5 MB in the beginning and 318.8 MB in the end (delta: 178.3 MB). Free memory was 104.4 MB in the beginning and 165.4 MB in the end (delta: -61.1 MB). Peak memory consumption was 184.7 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:27,597 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 19:04:27,598 INFO L168 Benchmark]: CACSL2BoogieTranslator took 288.80 ms. Allocated memory is still 140.5 MB. Free memory was 104.0 MB in the beginning and 93.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:27,599 INFO L168 Benchmark]: Boogie Preprocessor took 127.94 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 93.5 MB in the beginning and 180.9 MB in the end (delta: -87.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:27,599 INFO L168 Benchmark]: RCFGBuilder took 384.84 ms. Allocated memory is still 203.4 MB. Free memory was 180.9 MB in the beginning and 161.4 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:27,600 INFO L168 Benchmark]: TraceAbstraction took 9648.29 ms. Allocated memory was 203.4 MB in the beginning and 318.8 MB in the end (delta: 115.3 MB). Free memory was 160.8 MB in the beginning and 165.4 MB in the end (delta: -4.6 MB). Peak memory consumption was 178.2 MB. Max. memory is 7.1 GB. [2020-08-21 19:04:27,602 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 288.80 ms. Allocated memory is still 140.5 MB. Free memory was 104.0 MB in the beginning and 93.5 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 127.94 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 93.5 MB in the beginning and 180.9 MB in the end (delta: -87.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 384.84 ms. Allocated memory is still 203.4 MB. Free memory was 180.9 MB in the beginning and 161.4 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 9648.29 ms. Allocated memory was 203.4 MB in the beginning and 318.8 MB in the end (delta: 115.3 MB). Free memory was 160.8 MB in the beginning and 165.4 MB in the end (delta: -4.6 MB). Peak memory consumption was 178.2 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 19:04:27,609 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,609 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 19:04:27,612 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,613 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,613 WARN L1295 BoogieBacktranslator]: unknown boogie variable #memory_int [2020-08-21 19:04:27,613 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: 7.6s, OverallIterations: 23, TraceHistogramMax: 6, AutomataDifference: 4.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.9s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 545 SDtfs, 447 SDslu, 2131 SDs, 0 SdLazy, 2824 SolverSat, 308 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 326 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 254 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 2.4s 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, 0.2s HoareSimplificationTime, 11 FomulaSimplificationsInter, 4917 FormulaSimplificationTreeSizeReductionInter, 1.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 2.3s 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...