/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 NUM_VARIABLES --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/afterrec_2calls-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:34:11,308 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:34:11,311 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:34:11,325 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:34:11,325 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:34:11,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:34:11,328 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:34:11,330 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:34:11,332 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:34:11,333 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:34:11,335 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:34:11,336 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:34:11,337 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:34:11,338 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:34:11,339 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:34:11,341 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:34:11,341 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:34:11,342 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:34:11,344 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:34:11,347 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:34:11,349 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:34:11,350 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:34:11,351 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:34:11,352 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:34:11,355 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:34:11,364 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:34:11,365 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:34:11,366 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:34:11,367 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 16:34:11,387 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:34:11,387 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:34:11,389 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:34:11,389 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:34:11,389 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:34:11,389 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:34:11,390 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:34:11,390 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:34:11,390 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:34:11,390 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:34:11,390 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:34:11,391 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:34:11,391 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:34:11,391 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:34:11,391 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:34:11,391 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:34:11,392 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:34:11,392 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:34:11,392 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:34:11,392 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:34:11,392 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:34:11,393 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:34:11,393 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:34:11,393 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:34:11,393 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:34:11,394 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:34:11,394 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:11,394 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:34:11,394 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:34:11,394 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 -> NUM_VARIABLES 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 16:34:11,737 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:34:11,753 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:34:11,757 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:34:11,759 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:34:11,760 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:34:11,761 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-2.c [2020-07-20 16:34:11,840 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ab7d1f83/4b014525c79b4e398943c72f07eaaf3c/FLAG7f85f0093 [2020-07-20 16:34:12,354 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:34:12,355 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-2.c [2020-07-20 16:34:12,365 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ab7d1f83/4b014525c79b4e398943c72f07eaaf3c/FLAG7f85f0093 [2020-07-20 16:34:12,697 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2ab7d1f83/4b014525c79b4e398943c72f07eaaf3c [2020-07-20 16:34:12,709 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:34:12,713 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:34:12,714 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:34:12,714 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:34:12,718 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:34:12,719 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:34:12" (1/1) ... [2020-07-20 16:34:12,723 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a781666 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:12, skipping insertion in model container [2020-07-20 16:34:12,723 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:34:12" (1/1) ... [2020-07-20 16:34:12,732 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:34:12,751 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:34:13,008 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:34:13,013 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:34:13,030 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:34:13,046 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:34:13,047 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13 WrapperNode [2020-07-20 16:34:13,047 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:34:13,048 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:34:13,048 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:34:13,048 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:34:13,065 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,065 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,071 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,072 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,156 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,159 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,161 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (1/1) ... [2020-07-20 16:34:13,162 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:34:13,164 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:34:13,164 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:34:13,164 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:34:13,165 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (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 16:34:13,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:34:13,240 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:34:13,240 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-20 16:34:13,240 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-07-20 16:34:13,240 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:34:13,241 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:34:13,241 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-20 16:34:13,241 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-07-20 16:34:13,241 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:34:13,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:34:13,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:34:13,421 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:34:13,422 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:34:13,428 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:34:13 BoogieIcfgContainer [2020-07-20 16:34:13,428 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:34:13,432 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:34:13,432 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:34:13,437 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:34:13,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:34:12" (1/3) ... [2020-07-20 16:34:13,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15054c3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:34:13, skipping insertion in model container [2020-07-20 16:34:13,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:34:13" (2/3) ... [2020-07-20 16:34:13,439 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15054c3f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:34:13, skipping insertion in model container [2020-07-20 16:34:13,439 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:34:13" (3/3) ... [2020-07-20 16:34:13,442 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-2.c [2020-07-20 16:34:13,455 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:34:13,471 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 16:34:13,487 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 16:34:13,518 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:34:13,518 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:34:13,518 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:34:13,519 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:34:13,519 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:34:13,519 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:34:13,519 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:34:13,519 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:34:13,540 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 16:34:13,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:34:13,548 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:13,549 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:13,550 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:13,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:13,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-07-20 16:34:13,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:13,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [666832283] [2020-07-20 16:34:13,564 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 16:34:13,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:34:13,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:13,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 16:34:13,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:13,710 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 16:34:13,711 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:34:13,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [666832283] [2020-07-20 16:34:13,713 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:34:13,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 16:34:13,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744448513] [2020-07-20 16:34:13,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 16:34:13,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:34:13,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 16:34:13,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 16:34:13,759 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 4 states. [2020-07-20 16:34:13,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:13,829 INFO L93 Difference]: Finished difference Result 31 states and 33 transitions. [2020-07-20 16:34:13,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 16:34:13,832 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-07-20 16:34:13,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:13,840 INFO L225 Difference]: With dead ends: 31 [2020-07-20 16:34:13,841 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 16:34:13,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:34:13,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 16:34:13,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 16:34:13,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 16:34:13,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 16:34:13,872 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 13 [2020-07-20 16:34:13,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:13,872 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 16:34:13,872 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 16:34:13,873 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 16:34:13,873 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 16:34:14,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:14,091 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 16:34:14,176 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 16:34:14,176 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:34:14,176 INFO L268 CegarLoopResult]: For program point fErr0ASSERT_VIOLATIONERROR_FUNCTION(line 10) no Hoare annotation was computed. [2020-07-20 16:34:14,177 INFO L264 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: (not (<= |f_#in~n| 2)) [2020-07-20 16:34:14,177 INFO L268 CegarLoopResult]: For program point L9-1(lines 6 11) no Hoare annotation was computed. [2020-07-20 16:34:14,177 INFO L268 CegarLoopResult]: For program point fEXIT(lines 6 11) no Hoare annotation was computed. [2020-07-20 16:34:14,177 INFO L268 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-07-20 16:34:14,177 INFO L271 CegarLoopResult]: At program point fENTRY(lines 6 11) the Hoare annotation is: true [2020-07-20 16:34:14,177 INFO L268 CegarLoopResult]: For program point fFINAL(lines 6 11) no Hoare annotation was computed. [2020-07-20 16:34:14,178 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 16:34:14,178 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 16:34:14,178 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 16:34:14,178 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 16:34:14,179 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 20 22) the Hoare annotation is: true [2020-07-20 16:34:14,179 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 20 22) no Hoare annotation was computed. [2020-07-20 16:34:14,179 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 20 22) no Hoare annotation was computed. [2020-07-20 16:34:14,179 INFO L271 CegarLoopResult]: At program point L16(line 16) the Hoare annotation is: true [2020-07-20 16:34:14,180 INFO L268 CegarLoopResult]: For program point f2EXIT(lines 13 18) no Hoare annotation was computed. [2020-07-20 16:34:14,180 INFO L268 CegarLoopResult]: For program point L16-1(lines 13 18) no Hoare annotation was computed. [2020-07-20 16:34:14,180 INFO L268 CegarLoopResult]: For program point L14(line 14) no Hoare annotation was computed. [2020-07-20 16:34:14,180 INFO L271 CegarLoopResult]: At program point f2ENTRY(lines 13 18) the Hoare annotation is: true [2020-07-20 16:34:14,180 INFO L268 CegarLoopResult]: For program point f2FINAL(lines 13 18) no Hoare annotation was computed. [2020-07-20 16:34:14,181 INFO L268 CegarLoopResult]: For program point f2Err0ASSERT_VIOLATIONERROR_FUNCTION(line 17) no Hoare annotation was computed. [2020-07-20 16:34:14,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:34:14 BoogieIcfgContainer [2020-07-20 16:34:14,188 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:34:14,192 INFO L168 Benchmark]: Toolchain (without parser) took 1480.00 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 100.4 MB in the beginning and 138.7 MB in the end (delta: -38.3 MB). Peak memory consumption was 25.7 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:14,193 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 135.8 MB. Free memory is still 118.5 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 16:34:14,194 INFO L168 Benchmark]: CACSL2BoogieTranslator took 333.91 ms. Allocated memory is still 135.8 MB. Free memory was 100.0 MB in the beginning and 90.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:14,195 INFO L168 Benchmark]: Boogie Preprocessor took 114.58 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 90.5 MB in the beginning and 178.6 MB in the end (delta: -88.2 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:14,196 INFO L168 Benchmark]: RCFGBuilder took 265.40 ms. Allocated memory is still 199.8 MB. Free memory was 178.6 MB in the beginning and 166.5 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:14,197 INFO L168 Benchmark]: TraceAbstraction took 756.84 ms. Allocated memory is still 199.8 MB. Free memory was 166.5 MB in the beginning and 138.7 MB in the end (delta: 27.8 MB). Peak memory consumption was 27.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:34:14,202 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 135.8 MB. Free memory is still 118.5 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 333.91 ms. Allocated memory is still 135.8 MB. Free memory was 100.0 MB in the beginning and 90.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 114.58 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 90.5 MB in the beginning and 178.6 MB in the end (delta: -88.2 MB). Peak memory consumption was 14.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 265.40 ms. Allocated memory is still 199.8 MB. Free memory was 178.6 MB in the beginning and 166.5 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 756.84 ms. Allocated memory is still 199.8 MB. Free memory was 166.5 MB in the beginning and 138.7 MB in the end (delta: 27.8 MB). Peak memory consumption was 27.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 10]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - PositiveResult [Line: 17]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 2 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 0.5s, OverallIterations: 1, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 9 SDtfs, 5 SDslu, 15 SDs, 0 SdLazy, 5 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=23occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 10 PreInvPairs, 10 NumberOfFragments, 11 HoareAnnotationTreeSize, 10 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 13 NumberOfCodeBlocks, 12 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 192 SizeOfPredicates, 1 NumberOfNonLiveVariables, 28 ConjunctsInSsa, 3 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...