/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:36:35,858 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:36:35,890 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:36:35,891 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:36:35,893 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:36:35,895 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:36:35,896 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:36:35,897 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:36:35,899 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:36:35,901 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:36:35,903 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:36:35,905 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:36:35,906 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:36:35,907 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:36:35,910 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:36:35,923 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:36:35,941 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:36:35,941 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:36:35,946 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:36:35,946 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:36:35,947 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:36:35,947 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:36:35,947 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:36:35,947 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:36:35,948 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:36:35,948 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:36:35,948 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:36:35,948 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:36:35,949 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:36:35,949 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:36:35,949 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:36:35,950 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:36:35,950 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:36:35,950 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:36:35,950 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:36:35,951 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:36:35,951 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:36:35,951 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:36:35,951 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:36:35,951 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:36:35,952 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:36:35,952 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:36:35,952 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:35,952 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:36:35,953 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:36:35,953 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 21:36:36,331 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:36:36,346 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:36:36,351 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:36:36,353 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:36:36,354 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:36:36,355 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-20 21:36:36,438 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a99792a8/ac8e8e24d8584808b65f968f783b9d1f/FLAG11ae486a7 [2020-07-20 21:36:36,959 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:36:36,960 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_b3_o2.c [2020-07-20 21:36:36,971 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a99792a8/ac8e8e24d8584808b65f968f783b9d1f/FLAG11ae486a7 [2020-07-20 21:36:37,327 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5a99792a8/ac8e8e24d8584808b65f968f783b9d1f [2020-07-20 21:36:37,339 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:36:37,343 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:36:37,346 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:37,347 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:36:37,350 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:36:37,351 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,354 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@488ef66a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37, skipping insertion in model container [2020-07-20 21:36:37,355 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,363 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:36:37,381 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:36:37,565 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:37,569 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:36:37,587 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:37,600 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:36:37,600 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37 WrapperNode [2020-07-20 21:36:37,600 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:37,601 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:36:37,601 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:36:37,601 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:36:37,615 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,615 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,620 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,623 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,625 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,626 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... [2020-07-20 21:36:37,627 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:36:37,628 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:36:37,628 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:36:37,628 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:36:37,629 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (1/1) ... No working directory specified, using /storage/repos/ultimate/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 [2020-07-20 21:36:37,776 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:36:37,776 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:36:37,776 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 21:36:37,776 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-20 21:36:37,777 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:36:37,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 21:36:37,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:36:37,777 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 21:36:37,777 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-20 21:36:37,777 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:36:37,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:36:37,778 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:36:37,976 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:36:37,977 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:36:37,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:37 BoogieIcfgContainer [2020-07-20 21:36:37,983 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:36:37,998 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:36:37,998 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:36:38,007 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:36:38,008 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:36:37" (1/3) ... [2020-07-20 21:36:38,009 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@444f1254 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:38, skipping insertion in model container [2020-07-20 21:36:38,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:37" (2/3) ... [2020-07-20 21:36:38,010 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@444f1254 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:38, skipping insertion in model container [2020-07-20 21:36:38,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:37" (3/3) ... [2020-07-20 21:36:38,019 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_b3_o2.c [2020-07-20 21:36:38,039 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:36:38,046 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:36:38,062 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:36:38,088 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:36:38,089 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:36:38,089 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:36:38,089 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:36:38,090 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:36:38,090 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:36:38,090 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:36:38,090 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:36:38,110 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2020-07-20 21:36:38,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:36:38,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,118 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,118 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,128 INFO L82 PathProgramCache]: Analyzing trace with hash 128923731, now seen corresponding path program 1 times [2020-07-20 21:36:38,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [374087682] [2020-07-20 21:36:38,148 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:38,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:38,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:38,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:38,290 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:36:38,291 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:38,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [374087682] [2020-07-20 21:36:38,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:38,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:38,295 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147474580] [2020-07-20 21:36:38,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:38,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:38,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:38,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:38,315 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 5 states. [2020-07-20 21:36:38,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:38,385 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-20 21:36:38,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:38,387 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:36:38,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:38,396 INFO L225 Difference]: With dead ends: 40 [2020-07-20 21:36:38,397 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 21:36:38,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:38,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 21:36:38,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-07-20 21:36:38,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:36:38,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2020-07-20 21:36:38,445 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 13 [2020-07-20 21:36:38,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:38,446 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2020-07-20 21:36:38,446 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:38,446 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2020-07-20 21:36:38,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:36:38,448 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,448 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,664 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,665 INFO L82 PathProgramCache]: Analyzing trace with hash 1945633833, now seen corresponding path program 1 times [2020-07-20 21:36:38,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [478142947] [2020-07-20 21:36:38,666 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,700 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:38,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:38,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:36:38,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:38,735 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:36:38,735 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:38,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [478142947] [2020-07-20 21:36:38,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:38,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:38,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266010003] [2020-07-20 21:36:38,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:38,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:38,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:38,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:38,739 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 5 states. [2020-07-20 21:36:38,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:38,770 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-20 21:36:38,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:38,771 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-07-20 21:36:38,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:38,773 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:36:38,773 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:36:38,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:38,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:36:38,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:36:38,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:36:38,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-20 21:36:38,784 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-20 21:36:38,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:38,785 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-20 21:36:38,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:38,785 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-20 21:36:38,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-20 21:36:38,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,787 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,001 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:39,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:39,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1974262984, now seen corresponding path program 1 times [2020-07-20 21:36:39,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:39,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [692883584] [2020-07-20 21:36:39,003 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:39,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:39,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:39,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:39,112 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:36:39,113 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:39,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [692883584] [2020-07-20 21:36:39,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:39,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 21:36:39,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303029116] [2020-07-20 21:36:39,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 21:36:39,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:39,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 21:36:39,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-20 21:36:39,116 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 8 states. [2020-07-20 21:36:39,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:39,171 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-20 21:36:39,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:39,172 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-07-20 21:36:39,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:39,174 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:36:39,174 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:36:39,175 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:36:39,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:36:39,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:36:39,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:36:39,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2020-07-20 21:36:39,182 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 20 [2020-07-20 21:36:39,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:39,182 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2020-07-20 21:36:39,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 21:36:39,183 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2020-07-20 21:36:39,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:39,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:39,184 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, 1, 1] [2020-07-20 21:36:39,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,400 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:39,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:39,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1423155149, now seen corresponding path program 1 times [2020-07-20 21:36:39,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:39,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052393749] [2020-07-20 21:36:39,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:39,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:39,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 21:36:39,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:39,487 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:36:39,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:39,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052393749] [2020-07-20 21:36:39,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:39,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:39,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461359602] [2020-07-20 21:36:39,490 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:39,490 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:39,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:39,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:39,491 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 5 states. [2020-07-20 21:36:39,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:39,513 INFO L93 Difference]: Finished difference Result 48 states and 55 transitions. [2020-07-20 21:36:39,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:39,514 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 27 [2020-07-20 21:36:39,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:39,515 INFO L225 Difference]: With dead ends: 48 [2020-07-20 21:36:39,516 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 21:36:39,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:39,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 21:36:39,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-07-20 21:36:39,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-20 21:36:39,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2020-07-20 21:36:39,524 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 27 [2020-07-20 21:36:39,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:39,524 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2020-07-20 21:36:39,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:39,525 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2020-07-20 21:36:39,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:39,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:39,526 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, 1, 1] [2020-07-20 21:36:39,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,740 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:39,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:39,742 INFO L82 PathProgramCache]: Analyzing trace with hash 1226641644, now seen corresponding path program 1 times [2020-07-20 21:36:39,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:39,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895630913] [2020-07-20 21:36:39,744 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:39,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:39,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:39,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:39,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:39,849 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 21:36:39,849 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:39,850 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895630913] [2020-07-20 21:36:39,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:39,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 21:36:39,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315186588] [2020-07-20 21:36:39,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 21:36:39,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:39,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 21:36:39,852 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-20 21:36:39,852 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand 8 states. [2020-07-20 21:36:39,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:39,950 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-20 21:36:39,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:39,950 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-20 21:36:39,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:39,952 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:36:39,953 INFO L226 Difference]: Without dead ends: 40 [2020-07-20 21:36:39,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:36:39,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-20 21:36:39,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 38. [2020-07-20 21:36:39,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-20 21:36:39,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-20 21:36:39,969 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 27 [2020-07-20 21:36:39,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:39,971 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-20 21:36:39,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 21:36:39,971 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-20 21:36:39,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:39,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:39,973 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, 1, 1] [2020-07-20 21:36:40,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:40,193 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:40,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:40,194 INFO L82 PathProgramCache]: Analyzing trace with hash 1255270795, now seen corresponding path program 1 times [2020-07-20 21:36:40,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:40,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858871453] [2020-07-20 21:36:40,195 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:40,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:40,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 21:36:40,225 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:36:40,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 21:36:40,234 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:36:40,254 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 21:36:40,255 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 21:36:40,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:40,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:36:40 BoogieIcfgContainer [2020-07-20 21:36:40,491 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:36:40,494 INFO L168 Benchmark]: Toolchain (without parser) took 3152.32 ms. Allocated memory was 134.7 MB in the beginning and 224.9 MB in the end (delta: 90.2 MB). Free memory was 100.0 MB in the beginning and 183.5 MB in the end (delta: -83.5 MB). Peak memory consumption was 6.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,495 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 134.7 MB. Free memory was 117.8 MB in the beginning and 117.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,496 INFO L168 Benchmark]: CACSL2BoogieTranslator took 254.14 ms. Allocated memory is still 134.7 MB. Free memory was 99.6 MB in the beginning and 89.6 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,497 INFO L168 Benchmark]: Boogie Preprocessor took 26.70 ms. Allocated memory is still 134.7 MB. Free memory was 89.6 MB in the beginning and 88.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,498 INFO L168 Benchmark]: RCFGBuilder took 355.53 ms. Allocated memory was 134.7 MB in the beginning and 198.7 MB in the end (delta: 64.0 MB). Free memory was 88.2 MB in the beginning and 165.5 MB in the end (delta: -77.3 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,499 INFO L168 Benchmark]: TraceAbstraction took 2493.80 ms. Allocated memory was 198.7 MB in the beginning and 224.9 MB in the end (delta: 26.2 MB). Free memory was 164.8 MB in the beginning and 183.5 MB in the end (delta: -18.7 MB). Peak memory consumption was 7.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:40,502 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 134.7 MB. Free memory was 117.8 MB in the beginning and 117.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 254.14 ms. Allocated memory is still 134.7 MB. Free memory was 99.6 MB in the beginning and 89.6 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.70 ms. Allocated memory is still 134.7 MB. Free memory was 89.6 MB in the beginning and 88.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 355.53 ms. Allocated memory was 134.7 MB in the beginning and 198.7 MB in the end (delta: 64.0 MB). Free memory was 88.2 MB in the beginning and 165.5 MB in the end (delta: -77.3 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2493.80 ms. Allocated memory was 198.7 MB in the beginning and 224.9 MB in the end (delta: 26.2 MB). Free memory was 164.8 MB in the beginning and 183.5 MB in the end (delta: -18.7 MB). Peak memory consumption was 7.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 25]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L22] unsigned int input = __VERIFIER_nondet_uint(); [L23] CALL, EXPR id(input) VAL [\old(x)=2] [L8] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=1] [L15] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L16] CALL, EXPR id(x-1) VAL [\old(x)=0] [L8] COND TRUE x==0 [L8] return 0; VAL [\old(x)=0, \result=0, x=0] [L16] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L16] unsigned int ret = id(x-1) + 1; [L17] COND FALSE !(ret > 3) [L18] return ret; VAL [\old(x)=1, \result=1, ret=1, x=1] [L9] RET, EXPR id2(x-1) VAL [\old(x)=2, id2(x-1)=1, x=2] [L9] unsigned int ret = id2(x-1) + 1; [L10] COND FALSE !(ret > 3) [L11] return ret; VAL [\old(x)=2, \result=2, ret=2, x=2] [L23] RET, EXPR id(input) VAL [id(input)=2, input=2] [L23] unsigned int result = id(input); [L24] COND TRUE result == 2 VAL [input=2, result=2] [L25] __VERIFIER_error() VAL [input=2, result=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 6, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 143 SDtfs, 12 SDslu, 562 SDs, 0 SdLazy, 95 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 104 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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, 8 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 134 NumberOfCodeBlocks, 107 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 102 ConstructedInterpolants, 0 QuantifiedInterpolants, 3394 SizeOfPredicates, 7 NumberOfNonLiveVariables, 203 ConjunctsInSsa, 48 ConjunctsInUnsatCore, 5 InterpolantComputations, 5 PerfectInterpolantSequences, 8/8 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...