/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=LOWLEXORDER -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 18:49:09,442 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 18:49:09,445 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 18:49:09,483 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 18:49:09,483 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 18:49:09,492 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 18:49:09,495 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 18:49:09,498 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 18:49:09,501 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 18:49:09,504 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 18:49:09,505 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 18:49:09,506 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 18:49:09,506 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 18:49:09,509 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 18:49:09,511 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 18:49:09,513 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 18:49:09,514 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 18:49:09,515 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 18:49:09,517 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 18:49:09,525 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 18:49:09,528 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 18:49:09,530 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 18:49:09,531 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 18:49:09,532 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 18:49:09,551 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 18:49:09,551 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 18:49:09,551 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 18:49:09,552 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 18:49:09,553 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 18:49:09,554 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 18:49:09,558 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 18:49:09,559 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 18:49:09,560 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 18:49:09,560 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 18:49:09,561 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 18:49:09,562 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 18:49:09,562 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 18:49:09,563 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 18:49:09,564 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 18:49:09,565 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 18:49:09,566 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 18:49:09,567 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 [2020-08-18 18:49:09,607 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 18:49:09,607 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 18:49:09,609 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 18:49:09,610 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 18:49:09,610 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 18:49:09,610 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 18:49:09,611 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 18:49:09,611 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 18:49:09,611 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 18:49:09,611 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 18:49:09,612 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 18:49:09,612 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 18:49:09,612 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 18:49:09,613 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 18:49:09,613 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 18:49:09,613 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 18:49:09,613 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 18:49:09,614 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 18:49:09,614 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 18:49:09,614 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 18:49:09,614 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 18:49:09,615 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 18:49:09,615 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 18:49:09,615 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 18:49:09,615 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 18:49:09,615 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 18:49:09,616 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 18:49:09,616 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 18:49:09,616 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 18:49:09,616 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=5;interpolation-heuristic=LOWLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=LOWLEXORDER; [2020-08-18 18:49:09,915 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 18:49:09,928 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 18:49:09,932 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 18:49:09,934 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 18:49:09,934 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 18:49:09,935 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-18 18:49:10,009 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b14e5157a/503481dd328a4bb893f9155f41315079/FLAGc75e3c744 [2020-08-18 18:49:10,466 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 18:49:10,467 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-08-18 18:49:10,474 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b14e5157a/503481dd328a4bb893f9155f41315079/FLAGc75e3c744 [2020-08-18 18:49:10,870 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b14e5157a/503481dd328a4bb893f9155f41315079 [2020-08-18 18:49:10,880 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 18:49:10,881 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 18:49:10,882 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:10,882 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 18:49:10,886 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 18:49:10,887 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:10" (1/1) ... [2020-08-18 18:49:10,890 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@729acd32 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:10, skipping insertion in model container [2020-08-18 18:49:10,890 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 06:49:10" (1/1) ... [2020-08-18 18:49:10,898 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 18:49:10,919 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 18:49:11,087 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:11,092 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 18:49:11,107 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 18:49:11,120 INFO L208 MainTranslator]: Completed translation [2020-08-18 18:49:11,121 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11 WrapperNode [2020-08-18 18:49:11,121 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 18:49:11,122 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 18:49:11,122 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 18:49:11,122 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 18:49:11,132 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,138 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,138 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,228 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,233 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,234 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (1/1) ... [2020-08-18 18:49:11,235 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 18:49:11,236 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 18:49:11,236 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 18:49:11,236 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 18:49:11,237 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (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 [2020-08-18 18:49:11,300 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 18:49:11,300 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 18:49:11,301 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 18:49:11,301 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 18:49:11,301 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 18:49:11,301 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 18:49:11,301 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 18:49:11,301 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 18:49:11,302 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 18:49:11,461 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 18:49:11,461 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 18:49:11,464 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:11 BoogieIcfgContainer [2020-08-18 18:49:11,464 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 18:49:11,466 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 18:49:11,466 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 18:49:11,469 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 18:49:11,469 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 06:49:10" (1/3) ... [2020-08-18 18:49:11,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d71a76e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:11, skipping insertion in model container [2020-08-18 18:49:11,470 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 06:49:11" (2/3) ... [2020-08-18 18:49:11,470 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d71a76e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 06:49:11, skipping insertion in model container [2020-08-18 18:49:11,471 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 06:49:11" (3/3) ... [2020-08-18 18:49:11,472 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-08-18 18:49:11,482 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 18:49:11,489 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 18:49:11,503 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 18:49:11,527 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 18:49:11,527 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 18:49:11,527 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 18:49:11,527 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 18:49:11,527 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 18:49:11,528 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 18:49:11,528 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 18:49:11,528 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 18:49:11,546 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-18 18:49:11,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-18 18:49:11,551 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:11,552 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:11,553 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:11,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:11,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-18 18:49:11,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:11,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712275233] [2020-08-18 18:49:11,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:11,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:11,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:11,760 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:11,761 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712275233] [2020-08-18 18:49:11,763 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 18:49:11,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 18:49:11,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194057482] [2020-08-18 18:49:11,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 18:49:11,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:11,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 18:49:11,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:49:11,795 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-18 18:49:11,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:11,902 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-18 18:49:11,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 18:49:11,904 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-18 18:49:11,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:11,914 INFO L225 Difference]: With dead ends: 29 [2020-08-18 18:49:11,915 INFO L226 Difference]: Without dead ends: 12 [2020-08-18 18:49:11,918 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 18:49:11,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-18 18:49:11,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-18 18:49:11,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-18 18:49:11,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-18 18:49:11,951 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-18 18:49:11,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:11,952 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-18 18:49:11,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 18:49:11,952 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-18 18:49:11,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-18 18:49:11,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:11,953 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:11,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 18:49:11,954 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:11,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:11,955 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-18 18:49:11,955 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:11,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822327460] [2020-08-18 18:49:11,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:11,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822327460] [2020-08-18 18:49:12,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-18 18:49:12,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842533498] [2020-08-18 18:49:12,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 18:49:12,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 18:49:12,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:49:12,048 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-18 18:49:12,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,074 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-18 18:49:12,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 18:49:12,075 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-18 18:49:12,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,076 INFO L225 Difference]: With dead ends: 18 [2020-08-18 18:49:12,076 INFO L226 Difference]: Without dead ends: 13 [2020-08-18 18:49:12,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-18 18:49:12,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-18 18:49:12,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-18 18:49:12,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-18 18:49:12,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-18 18:49:12,083 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-18 18:49:12,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,084 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-18 18:49:12,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 18:49:12,084 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-18 18:49:12,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 18:49:12,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,085 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 18:49:12,085 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-18 18:49:12,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714898913] [2020-08-18 18:49:12,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,183 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714898913] [2020-08-18 18:49:12,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 18:49:12,185 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080963820] [2020-08-18 18:49:12,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 18:49:12,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 18:49:12,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:12,187 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-18 18:49:12,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,209 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-18 18:49:12,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 18:49:12,210 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-18 18:49:12,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,211 INFO L225 Difference]: With dead ends: 19 [2020-08-18 18:49:12,211 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 18:49:12,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 18:49:12,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 18:49:12,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 18:49:12,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 18:49:12,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 18:49:12,218 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 18:49:12,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,218 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 18:49:12,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 18:49:12,218 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 18:49:12,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 18:49:12,219 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,219 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,220 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 18:49:12,220 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-18 18:49:12,221 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,221 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750861562] [2020-08-18 18:49:12,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,342 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750861562] [2020-08-18 18:49:12,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 18:49:12,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57437426] [2020-08-18 18:49:12,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 18:49:12,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 18:49:12,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:12,344 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-18 18:49:12,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,377 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-18 18:49:12,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 18:49:12,378 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-18 18:49:12,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,379 INFO L225 Difference]: With dead ends: 20 [2020-08-18 18:49:12,379 INFO L226 Difference]: Without dead ends: 15 [2020-08-18 18:49:12,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 18:49:12,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-18 18:49:12,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-18 18:49:12,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 18:49:12,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 18:49:12,385 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-18 18:49:12,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,386 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 18:49:12,386 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 18:49:12,386 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 18:49:12,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 18:49:12,387 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,387 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 18:49:12,388 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-18 18:49:12,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [227826869] [2020-08-18 18:49:12,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,507 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [227826869] [2020-08-18 18:49:12,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,508 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 18:49:12,508 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586328657] [2020-08-18 18:49:12,509 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 18:49:12,509 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 18:49:12,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:49:12,510 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-18 18:49:12,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,551 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-18 18:49:12,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 18:49:12,552 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-18 18:49:12,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,553 INFO L225 Difference]: With dead ends: 21 [2020-08-18 18:49:12,553 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 18:49:12,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-18 18:49:12,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 18:49:12,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-18 18:49:12,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 18:49:12,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-18 18:49:12,560 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-18 18:49:12,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,561 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-18 18:49:12,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 18:49:12,561 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-18 18:49:12,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 18:49:12,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,562 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 18:49:12,563 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-18 18:49:12,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182034945] [2020-08-18 18:49:12,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 18:49:12,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 18:49:12,719 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 18:49:12,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182034945] [2020-08-18 18:49:12,720 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 18:49:12,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 18:49:12,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303774041] [2020-08-18 18:49:12,721 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 18:49:12,721 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 18:49:12,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 18:49:12,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:12,722 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-18 18:49:12,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 18:49:12,771 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 18:49:12,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 18:49:12,772 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-18 18:49:12,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 18:49:12,773 INFO L225 Difference]: With dead ends: 22 [2020-08-18 18:49:12,773 INFO L226 Difference]: Without dead ends: 17 [2020-08-18 18:49:12,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-18 18:49:12,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-18 18:49:12,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-18 18:49:12,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 18:49:12,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 18:49:12,780 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-18 18:49:12,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 18:49:12,780 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 18:49:12,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 18:49:12,781 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 18:49:12,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 18:49:12,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 18:49:12,781 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 18:49:12,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 18:49:12,782 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 18:49:12,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 18:49:12,783 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-18 18:49:12,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 18:49:12,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1861555440] [2020-08-18 18:49:12,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 18:49:12,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 18:49:12,803 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 18:49:12,804 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 18:49:12,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 18:49:12,825 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 06:49:12 BoogieIcfgContainer [2020-08-18 18:49:12,826 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 18:49:12,829 INFO L168 Benchmark]: Toolchain (without parser) took 1946.39 ms. Allocated memory was 138.4 MB in the beginning and 232.8 MB in the end (delta: 94.4 MB). Free memory was 101.8 MB in the beginning and 191.6 MB in the end (delta: -89.8 MB). Peak memory consumption was 4.5 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:12,830 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-08-18 18:49:12,831 INFO L168 Benchmark]: CACSL2BoogieTranslator took 239.46 ms. Allocated memory is still 138.4 MB. Free memory was 101.4 MB in the beginning and 92.3 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:12,832 INFO L168 Benchmark]: Boogie Preprocessor took 113.49 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 92.3 MB in the beginning and 180.8 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:12,833 INFO L168 Benchmark]: RCFGBuilder took 228.65 ms. Allocated memory is still 201.9 MB. Free memory was 180.8 MB in the beginning and 169.3 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:12,833 INFO L168 Benchmark]: TraceAbstraction took 1360.21 ms. Allocated memory was 201.9 MB in the beginning and 232.8 MB in the end (delta: 30.9 MB). Free memory was 168.6 MB in the beginning and 191.6 MB in the end (delta: -23.0 MB). Peak memory consumption was 7.9 MB. Max. memory is 7.1 GB. [2020-08-18 18:49:12,838 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 239.46 ms. Allocated memory is still 138.4 MB. Free memory was 101.4 MB in the beginning and 92.3 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.49 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 92.3 MB in the beginning and 180.8 MB in the end (delta: -88.6 MB). Peak memory consumption was 13.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 228.65 ms. Allocated memory is still 201.9 MB. Free memory was 180.8 MB in the beginning and 169.3 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1360.21 ms. Allocated memory was 201.9 MB in the beginning and 232.8 MB in the end (delta: 30.9 MB). Free memory was 168.6 MB in the beginning and 191.6 MB in the end (delta: -23.0 MB). Peak memory consumption was 7.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 [L14] COND FALSE !(x < 6) [L19] CALL __VERIFIER_assert(y != 64) [L4] COND TRUE !(cond) [L5] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.2s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 166 SDs, 0 SdLazy, 97 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 2605 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 6 InterpolantComputations, 1 PerfectInterpolantSequences, 0/35 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 incorrect! Received shutdown request...