/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=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:17:35,958 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:17:35,961 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:17:36,000 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:17:36,000 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:17:36,009 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:17:36,012 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:17:36,016 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:17:36,018 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:17:36,021 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:17:36,022 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:17:36,023 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:17:36,024 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:17:36,026 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:17:36,029 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:17:36,031 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:17:36,032 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:17:36,033 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:17:36,035 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:17:36,044 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:17:36,046 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:17:36,047 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:17:36,049 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:17:36,049 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:17:36,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:17:36,083 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:17:36,084 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:17:36,085 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:17:36,086 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 20:17:36,125 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:17:36,126 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:17:36,128 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:17:36,129 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:17:36,129 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:17:36,129 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:17:36,129 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:17:36,130 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:17:36,130 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:17:36,130 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:17:36,131 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:17:36,131 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:17:36,132 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:17:36,132 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:17:36,132 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:17:36,132 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:17:36,133 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:17:36,133 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:17:36,133 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:17:36,133 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:17:36,133 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:17:36,134 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:17:36,134 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:17:36,134 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:17:36,134 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:17:36,134 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:17:36,135 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:17:36,135 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:17:36,135 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:17:36,135 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=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:17:36,493 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:17:36,512 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:17:36,518 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:17:36,519 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:17:36,520 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:17:36,521 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-08-18 20:17:36,606 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8b4ce1ccd/f770b2f17c434960a6437e73076c40f5/FLAGf248c8260 [2020-08-18 20:17:37,087 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:17:37,088 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-08-18 20:17:37,095 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8b4ce1ccd/f770b2f17c434960a6437e73076c40f5/FLAGf248c8260 [2020-08-18 20:17:37,465 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8b4ce1ccd/f770b2f17c434960a6437e73076c40f5 [2020-08-18 20:17:37,481 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:17:37,484 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:17:37,488 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:17:37,489 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:17:37,494 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:17:37,495 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,500 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c096cad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37, skipping insertion in model container [2020-08-18 20:17:37,500 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,510 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:17:37,530 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:17:37,698 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:17:37,701 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:17:37,725 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:17:37,742 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:17:37,743 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37 WrapperNode [2020-08-18 20:17:37,744 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:17:37,745 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:17:37,745 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:17:37,745 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:17:37,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,759 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,763 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,857 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,859 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,861 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (1/1) ... [2020-08-18 20:17:37,863 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:17:37,863 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:17:37,864 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:17:37,864 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:17:37,865 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (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 20:17:37,929 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:17:37,929 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:17:37,929 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-18 20:17:37,929 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-08-18 20:17:37,930 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:17:37,930 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 20:17:37,930 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:17:37,930 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-18 20:17:37,930 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-08-18 20:17:37,930 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:17:37,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:17:37,931 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:17:38,125 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:17:38,125 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 20:17:38,129 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:17:38 BoogieIcfgContainer [2020-08-18 20:17:38,130 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:17:38,131 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:17:38,131 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:17:38,134 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:17:38,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:17:37" (1/3) ... [2020-08-18 20:17:38,135 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1325a303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:17:38, skipping insertion in model container [2020-08-18 20:17:38,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:17:37" (2/3) ... [2020-08-18 20:17:38,136 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1325a303 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:17:38, skipping insertion in model container [2020-08-18 20:17:38,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:17:38" (3/3) ... [2020-08-18 20:17:38,138 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-08-18 20:17:38,149 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:17:38,156 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:17:38,171 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:17:38,196 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:17:38,196 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:17:38,197 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:17:38,197 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:17:38,197 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:17:38,198 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:17:38,198 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:17:38,198 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:17:38,219 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-08-18 20:17:38,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 20:17:38,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:17:38,228 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:17:38,228 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:17:38,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:17:38,236 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-08-18 20:17:38,243 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:17:38,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11443265] [2020-08-18 20:17:38,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:17:38,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:17:38,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 20:17:38,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,457 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 20:17:38,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11443265] [2020-08-18 20:17:38,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:17:38,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:17:38,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291668757] [2020-08-18 20:17:38,468 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:17:38,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:17:38,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:17:38,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:17:38,488 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-08-18 20:17:38,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:17:38,594 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-08-18 20:17:38,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:17:38,599 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 20:17:38,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:17:38,615 INFO L225 Difference]: With dead ends: 36 [2020-08-18 20:17:38,616 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 20:17:38,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:17:38,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 20:17:38,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 20:17:38,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 20:17:38,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 20:17:38,683 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-08-18 20:17:38,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:17:38,683 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 20:17:38,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:17:38,684 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 20:17:38,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 20:17:38,687 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:17:38,687 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:17:38,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:17:38,688 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:17:38,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:17:38,692 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-08-18 20:17:38,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:17:38,693 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926528608] [2020-08-18 20:17:38,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:17:38,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:17:38,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 20:17:38,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:38,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:38,856 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 20:17:38,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926528608] [2020-08-18 20:17:38,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:17:38,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-18 20:17:38,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641956026] [2020-08-18 20:17:38,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:17:38,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:17:38,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:17:38,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:17:38,861 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-08-18 20:17:38,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:17:38,971 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-08-18 20:17:38,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:17:38,972 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-18 20:17:38,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:17:38,973 INFO L225 Difference]: With dead ends: 33 [2020-08-18 20:17:38,974 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 20:17:38,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:17:38,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 20:17:38,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-08-18 20:17:38,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 20:17:38,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-08-18 20:17:38,984 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-08-18 20:17:38,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:17:38,985 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-08-18 20:17:38,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:17:38,986 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-08-18 20:17:38,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 20:17:38,987 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:17:38,987 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:17:38,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:17:38,988 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:17:38,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:17:38,988 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-08-18 20:17:38,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:17:38,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [960641005] [2020-08-18 20:17:38,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:17:39,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:17:39,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 20:17:39,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,157 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 20:17:39,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [960641005] [2020-08-18 20:17:39,158 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:17:39,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:17:39,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498376225] [2020-08-18 20:17:39,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:17:39,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:17:39,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:17:39,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:17:39,161 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 8 states. [2020-08-18 20:17:39,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:17:39,251 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-08-18 20:17:39,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:17:39,252 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-08-18 20:17:39,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:17:39,253 INFO L225 Difference]: With dead ends: 39 [2020-08-18 20:17:39,253 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 20:17:39,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:17:39,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 20:17:39,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-08-18 20:17:39,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 20:17:39,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 20:17:39,264 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-08-18 20:17:39,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:17:39,264 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 20:17:39,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:17:39,265 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 20:17:39,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 20:17:39,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:17:39,267 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:17:39,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:17:39,267 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:17:39,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:17:39,268 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-08-18 20:17:39,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:17:39,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1572970861] [2020-08-18 20:17:39,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:17:39,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:17:39,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 20:17:39,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,509 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:17:39,510 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1572970861] [2020-08-18 20:17:39,510 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:17:39,510 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:17:39,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391357166] [2020-08-18 20:17:39,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:17:39,511 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:17:39,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:17:39,512 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:17:39,512 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2020-08-18 20:17:39,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:17:39,611 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-08-18 20:17:39,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:17:39,613 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-08-18 20:17:39,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:17:39,615 INFO L225 Difference]: With dead ends: 45 [2020-08-18 20:17:39,615 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 20:17:39,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:17:39,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 20:17:39,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-08-18 20:17:39,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:17:39,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-08-18 20:17:39,624 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-08-18 20:17:39,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:17:39,624 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-08-18 20:17:39,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:17:39,625 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-08-18 20:17:39,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 20:17:39,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:17:39,627 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:17:39,627 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:17:39,627 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:17:39,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:17:39,627 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-08-18 20:17:39,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:17:39,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [333729789] [2020-08-18 20:17:39,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:17:39,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:17:39,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 20:17:39,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,785 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,839 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 20:17:39,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:17:39,959 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-08-18 20:17:39,960 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [333729789] [2020-08-18 20:17:39,960 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:17:39,961 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:17:39,961 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640086096] [2020-08-18 20:17:39,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:17:39,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:17:39,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:17:39,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:17:39,965 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2020-08-18 20:17:40,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:17:40,087 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 20:17:40,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:17:40,087 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 37 [2020-08-18 20:17:40,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:17:40,089 INFO L225 Difference]: With dead ends: 51 [2020-08-18 20:17:40,089 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 20:17:40,090 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:17:40,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 20:17:40,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-08-18 20:17:40,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 20:17:40,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 20:17:40,099 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-08-18 20:17:40,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:17:40,099 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 20:17:40,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:17:40,100 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 20:17:40,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 20:17:40,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:17:40,102 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:17:40,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:17:40,102 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:17:40,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:17:40,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-08-18 20:17:40,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:17:40,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1419035613] [2020-08-18 20:17:40,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:17:40,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 20:17:40,120 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 20:17:40,120 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 20:17:40,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:17:40,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 08:17:40 BoogieIcfgContainer [2020-08-18 20:17:40,179 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 20:17:40,185 INFO L168 Benchmark]: Toolchain (without parser) took 2698.58 ms. Allocated memory was 148.9 MB in the beginning and 231.7 MB in the end (delta: 82.8 MB). Free memory was 103.9 MB in the beginning and 135.6 MB in the end (delta: -31.7 MB). Peak memory consumption was 51.1 MB. Max. memory is 7.1 GB. [2020-08-18 20:17:40,186 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 148.9 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 20:17:40,188 INFO L168 Benchmark]: CACSL2BoogieTranslator took 255.87 ms. Allocated memory is still 148.9 MB. Free memory was 103.7 MB in the beginning and 94.4 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-18 20:17:40,189 INFO L168 Benchmark]: Boogie Preprocessor took 118.39 ms. Allocated memory was 148.9 MB in the beginning and 203.4 MB in the end (delta: 54.5 MB). Free memory was 94.4 MB in the beginning and 182.6 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-08-18 20:17:40,190 INFO L168 Benchmark]: RCFGBuilder took 266.42 ms. Allocated memory is still 203.4 MB. Free memory was 182.6 MB in the beginning and 170.1 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-18 20:17:40,192 INFO L168 Benchmark]: TraceAbstraction took 2048.68 ms. Allocated memory was 203.4 MB in the beginning and 231.7 MB in the end (delta: 28.3 MB). Free memory was 169.5 MB in the beginning and 135.6 MB in the end (delta: 33.9 MB). Peak memory consumption was 62.2 MB. Max. memory is 7.1 GB. [2020-08-18 20:17:40,199 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 148.9 MB. Free memory was 122.1 MB in the beginning and 121.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 255.87 ms. Allocated memory is still 148.9 MB. Free memory was 103.7 MB in the beginning and 94.4 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 118.39 ms. Allocated memory was 148.9 MB in the beginning and 203.4 MB in the end (delta: 54.5 MB). Free memory was 94.4 MB in the beginning and 182.6 MB in the end (delta: -88.3 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 266.42 ms. Allocated memory is still 203.4 MB. Free memory was 182.6 MB in the beginning and 170.1 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2048.68 ms. Allocated memory was 203.4 MB in the beginning and 231.7 MB in the end (delta: 28.3 MB). Free memory was 169.5 MB in the beginning and 135.6 MB in the end (delta: 33.9 MB). Peak memory consumption was 62.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; [L19] CALL, EXPR id(input) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND FALSE !(x==0) [L14] CALL, EXPR id(x-1) [L8] COND FALSE !(x==0) [L9] CALL, EXPR id2(x-1) [L13] COND TRUE x==0 [L13] return 0; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) [L19] int result = id(input); [L20] COND TRUE result == 5 [L21] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.9s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 92 SDtfs, 71 SDslu, 374 SDs, 0 SdLazy, 210 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 85 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=36occurred in iteration=5, 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, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 168 NumberOfCodeBlocks, 168 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 120 ConstructedInterpolants, 0 QuantifiedInterpolants, 7200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 2 PerfectInterpolantSequences, 17/34 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...