/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 log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:14:53,401 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:14:53,403 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:14:53,427 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:14:53,427 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:14:53,428 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:14:53,430 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:14:53,432 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:14:53,434 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:14:53,434 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:14:53,436 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:14:53,437 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:14:53,437 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:14:53,438 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:14:53,441 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:14:53,442 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:14:53,443 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:14:53,444 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:14:53,446 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:14:53,452 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:14:53,455 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:14:53,458 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:14:53,459 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:14:53,462 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:14:53,467 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 14:14:53,467 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 14:14:53,467 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 14:14:53,470 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 14:14:53,471 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 14:14:53,473 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 14:14:53,480 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:14:53,481 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:14:53,483 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:14:53,483 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 14:14:53,535 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:14:53,536 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:14:53,539 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:14:53,539 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:14:53,539 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:14:53,540 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:14:53,540 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:14:53,540 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:14:53,540 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:14:53,540 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:14:53,540 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:14:53,541 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:14:53,544 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:14:53,544 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:14:53,544 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:14:53,545 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:14:53,545 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:14:53,545 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:14:53,546 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:14:53,546 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:14:53,546 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:14:53,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:14:53,546 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:14:53,547 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:14:53,547 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:14:53,547 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:14:53,547 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:14:53,547 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:14:53,547 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:14:53,548 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 -> log-additional-information=true; [2020-08-21 14:14:53,882 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:14:53,903 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:14:53,911 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:14:53,913 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:14:53,913 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:14:53,914 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-21 14:14:53,987 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9af7d796e/1d5a627e39364dd8a2d98400788068fe/FLAG57b6d28df [2020-08-21 14:14:54,429 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:14:54,429 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2020-08-21 14:14:54,436 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9af7d796e/1d5a627e39364dd8a2d98400788068fe/FLAG57b6d28df [2020-08-21 14:14:54,800 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/9af7d796e/1d5a627e39364dd8a2d98400788068fe [2020-08-21 14:14:54,810 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:14:54,812 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:14:54,813 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:54,813 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:14:54,817 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:14:54,818 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:54" (1/1) ... [2020-08-21 14:14:54,821 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19a1b984 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:54, skipping insertion in model container [2020-08-21 14:14:54,821 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:54" (1/1) ... [2020-08-21 14:14:54,829 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:14:54,847 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:14:55,044 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:55,047 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:14:55,062 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:55,076 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:14:55,077 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55 WrapperNode [2020-08-21 14:14:55,077 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:55,078 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:14:55,078 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:14:55,078 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:14:55,091 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,091 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,096 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,096 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,099 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,103 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,104 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (1/1) ... [2020-08-21 14:14:55,177 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:14:55,178 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:14:55,178 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:14:55,178 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:14:55,179 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (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 14:14:55,233 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:14:55,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:14:55,234 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 14:14:55,234 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:14:55,234 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:14:55,235 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 14:14:55,235 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:14:55,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:14:55,235 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:14:55,398 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:14:55,398 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 14:14:55,401 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:55 BoogieIcfgContainer [2020-08-21 14:14:55,402 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:14:55,403 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:14:55,403 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:14:55,405 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:14:55,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:14:54" (1/3) ... [2020-08-21 14:14:55,406 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e856f87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:55, skipping insertion in model container [2020-08-21 14:14:55,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:55" (2/3) ... [2020-08-21 14:14:55,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e856f87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:55, skipping insertion in model container [2020-08-21 14:14:55,407 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:55" (3/3) ... [2020-08-21 14:14:55,409 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-08-21 14:14:55,419 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:14:55,426 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:14:55,441 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:14:55,465 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:14:55,465 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:14:55,466 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:14:55,466 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:14:55,466 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:14:55,466 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:14:55,466 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:14:55,466 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:14:55,483 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 14:14:55,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 14:14:55,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:55,489 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:55,489 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:55,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:55,494 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 14:14:55,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:55,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1954311999] [2020-08-21 14:14:55,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:55,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:55,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:55,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:55,692 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 14:14:55,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1954311999] [2020-08-21 14:14:55,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:55,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 14:14:55,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652681059] [2020-08-21 14:14:55,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 14:14:55,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:55,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 14:14:55,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:14:55,721 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 14:14:55,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:55,756 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 14:14:55,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:14:55,758 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 14:14:55,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:55,767 INFO L225 Difference]: With dead ends: 29 [2020-08-21 14:14:55,767 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 14:14:55,771 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 [2020-08-21 14:14:55,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 14:14:55,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 14:14:55,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 14:14:55,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 14:14:55,819 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 14:14:55,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:55,820 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 14:14:55,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 14:14:55,821 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 14:14:55,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 14:14:55,823 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:55,823 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:55,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:14:55,825 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:55,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:55,826 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 14:14:55,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:55,827 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1702188635] [2020-08-21 14:14:55,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:55,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:55,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:55,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:55,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:55,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1702188635] [2020-08-21 14:14:55,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:55,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 14:14:55,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292107969] [2020-08-21 14:14:55,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:14:55,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:55,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:14:55,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:14:55,930 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 14:14:55,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:55,979 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 14:14:55,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 14:14:55,981 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 14:14:55,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:55,982 INFO L225 Difference]: With dead ends: 18 [2020-08-21 14:14:55,982 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 14:14:55,985 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 [2020-08-21 14:14:55,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 14:14:55,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 14:14:55,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 14:14:55,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 14:14:55,991 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 14:14:55,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:55,991 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 14:14:55,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:14:55,993 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 14:14:55,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 14:14:55,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:55,994 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:55,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:14:55,994 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:55,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:55,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 14:14:55,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:55,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640666784] [2020-08-21 14:14:55,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:56,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,122 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640666784] [2020-08-21 14:14:56,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 14:14:56,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173988323] [2020-08-21 14:14:56,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:14:56,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:14:56,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:56,125 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 14:14:56,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:56,148 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 14:14:56,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:14:56,149 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 14:14:56,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:56,150 INFO L225 Difference]: With dead ends: 19 [2020-08-21 14:14:56,150 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 14:14:56,151 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 [2020-08-21 14:14:56,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 14:14:56,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 14:14:56,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 14:14:56,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 14:14:56,157 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 14:14:56,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:56,157 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 14:14:56,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:14:56,157 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 14:14:56,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 14:14:56,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:56,160 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:56,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:14:56,160 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:56,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:56,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 14:14:56,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:56,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834541530] [2020-08-21 14:14:56,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:56,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,281 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,282 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834541530] [2020-08-21 14:14:56,282 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 14:14:56,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109087825] [2020-08-21 14:14:56,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:14:56,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:14:56,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:14:56,284 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 14:14:56,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:56,321 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 14:14:56,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:14:56,321 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 14:14:56,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:56,322 INFO L225 Difference]: With dead ends: 20 [2020-08-21 14:14:56,322 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 14:14:56,323 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 [2020-08-21 14:14:56,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 14:14:56,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 14:14:56,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 14:14:56,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 14:14:56,329 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 14:14:56,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:56,329 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 14:14:56,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:14:56,330 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 14:14:56,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 14:14:56,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:56,331 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:56,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:14:56,331 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:56,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:56,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 14:14:56,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:56,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853766866] [2020-08-21 14:14:56,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:56,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,502 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853766866] [2020-08-21 14:14:56,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:14:56,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931629378] [2020-08-21 14:14:56,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:14:56,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:14:56,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:14:56,508 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 14:14:56,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:56,555 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 14:14:56,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:14:56,556 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 14:14:56,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:56,557 INFO L225 Difference]: With dead ends: 21 [2020-08-21 14:14:56,557 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 14:14:56,558 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 [2020-08-21 14:14:56,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 14:14:56,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 14:14:56,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 14:14:56,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 14:14:56,563 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 14:14:56,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:56,564 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 14:14:56,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:14:56,564 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 14:14:56,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 14:14:56,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:56,565 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:56,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:14:56,566 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:56,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:56,566 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 14:14:56,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:56,567 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699692436] [2020-08-21 14:14:56,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:56,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699692436] [2020-08-21 14:14:56,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:14:56,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602666516] [2020-08-21 14:14:56,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:14:56,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:14:56,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:14:56,748 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 10 states. [2020-08-21 14:14:56,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:56,806 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 14:14:56,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 14:14:56,806 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 15 [2020-08-21 14:14:56,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:56,807 INFO L225 Difference]: With dead ends: 22 [2020-08-21 14:14:56,808 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 14:14:56,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:14:56,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 14:14:56,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 14:14:56,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 14:14:56,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 14:14:56,814 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 14:14:56,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:56,814 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 14:14:56,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:14:56,815 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 14:14:56,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 14:14:56,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:56,815 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:56,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:14:56,816 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:56,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:56,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 14:14:56,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:56,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929071915] [2020-08-21 14:14:56,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:56,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 14:14:56,833 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 14:14:56,833 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 14:14:56,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:14:56,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 02:14:56 BoogieIcfgContainer [2020-08-21 14:14:56,852 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 14:14:56,855 INFO L168 Benchmark]: Toolchain (without parser) took 2042.09 ms. Allocated memory was 140.5 MB in the beginning and 234.9 MB in the end (delta: 94.4 MB). Free memory was 104.4 MB in the beginning and 185.1 MB in the end (delta: -80.6 MB). Peak memory consumption was 13.7 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:56,856 INFO L168 Benchmark]: CDTParser took 0.41 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.6 kB). Peak memory consumption was 419.6 kB. Max. memory is 7.1 GB. [2020-08-21 14:14:56,857 INFO L168 Benchmark]: CACSL2BoogieTranslator took 264.09 ms. Allocated memory is still 140.5 MB. Free memory was 104.0 MB in the beginning and 94.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:56,858 INFO L168 Benchmark]: Boogie Preprocessor took 99.69 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 94.8 MB in the beginning and 182.1 MB in the end (delta: -87.2 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:56,858 INFO L168 Benchmark]: RCFGBuilder took 224.02 ms. Allocated memory is still 202.4 MB. Free memory was 182.1 MB in the beginning and 170.7 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:56,859 INFO L168 Benchmark]: TraceAbstraction took 1449.47 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 169.7 MB in the beginning and 185.1 MB in the end (delta: -15.3 MB). Peak memory consumption was 17.2 MB. Max. memory is 7.1 GB. [2020-08-21 14:14:56,863 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.41 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.6 kB). Peak memory consumption was 419.6 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 264.09 ms. Allocated memory is still 140.5 MB. Free memory was 104.0 MB in the beginning and 94.8 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 99.69 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 94.8 MB in the beginning and 182.1 MB in the end (delta: -87.2 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 224.02 ms. Allocated memory is still 202.4 MB. Free memory was 182.1 MB in the beginning and 170.7 MB in the end (delta: 11.4 MB). Peak memory consumption was 11.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1449.47 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 169.7 MB in the beginning and 185.1 MB in the end (delta: -15.3 MB). Peak memory consumption was 17.2 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(x != 6) [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: 1.3s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 0 SDslu, 182 SDs, 0 SdLazy, 111 SolverSat, 15 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 48 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.4s 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, 0.6s InterpolantComputationTime, 91 NumberOfCodeBlocks, 91 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 69 ConstructedInterpolants, 0 QuantifiedInterpolants, 2689 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...