/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_FUNCTIONS --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-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:21:00,189 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 13:21:00,204 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:21:00,206 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:21:00,207 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:21:00,209 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:21:00,210 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:21:00,211 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:21:00,212 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:21:00,213 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:21:00,214 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:21:00,215 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:21:00,216 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:21:00,217 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:21:00,217 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:21:00,218 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:21:00,220 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:21:00,222 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:21:00,224 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:21:00,225 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:21:00,226 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:21:00,226 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:21:00,229 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:21:00,236 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:21:00,237 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:21:00,238 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:21:00,239 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 13:21:00,254 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:21:00,255 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:21:00,256 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:21:00,256 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:21:00,256 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:21:00,257 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:21:00,257 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:21:00,257 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:21:00,257 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:21:00,257 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:21:00,258 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:21:00,258 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:21:00,258 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:21:00,258 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:21:00,258 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:21:00,259 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:21:00,259 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:21:00,259 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:21:00,259 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:21:00,259 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:21:00,260 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:21:00,260 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:21:00,260 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:21:00,260 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:21:00,260 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:21:00,261 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:21:00,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:00,261 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:21:00,261 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:21:00,261 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_FUNCTIONS 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 13:21:00,572 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:21:00,588 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:21:00,594 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:21:00,596 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:21:00,597 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:21:00,597 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-20 13:21:00,676 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bcb4c33bb/25b4ca691e9f4fd3800461633866b037/FLAGa4ba7c3d6 [2020-07-20 13:21:01,157 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:21:01,158 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-07-20 13:21:01,165 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bcb4c33bb/25b4ca691e9f4fd3800461633866b037/FLAGa4ba7c3d6 [2020-07-20 13:21:01,539 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bcb4c33bb/25b4ca691e9f4fd3800461633866b037 [2020-07-20 13:21:01,552 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:21:01,554 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:21:01,557 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:01,557 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:21:01,561 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:21:01,562 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,565 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@71a043a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01, skipping insertion in model container [2020-07-20 13:21:01,566 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,574 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:21:01,595 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:21:01,788 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:01,792 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:21:01,806 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:21:01,819 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:21:01,819 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01 WrapperNode [2020-07-20 13:21:01,819 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:21:01,820 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:21:01,820 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:21:01,820 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:21:01,831 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,836 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,837 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,926 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,931 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,932 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (1/1) ... [2020-07-20 13:21:01,933 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:21:01,934 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:21:01,934 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:21:01,934 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:21:01,937 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (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 13:21:02,004 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:21:02,004 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:21:02,004 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-07-20 13:21:02,004 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-07-20 13:21:02,004 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:21:02,005 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:21:02,005 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-07-20 13:21:02,005 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-07-20 13:21:02,005 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:21:02,005 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:21:02,005 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:21:02,179 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:21:02,179 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:21:02,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:02 BoogieIcfgContainer [2020-07-20 13:21:02,182 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:21:02,183 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:21:02,184 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:21:02,187 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:21:02,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:21:01" (1/3) ... [2020-07-20 13:21:02,188 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ac13d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:02, skipping insertion in model container [2020-07-20 13:21:02,188 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:21:01" (2/3) ... [2020-07-20 13:21:02,189 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31ac13d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:21:02, skipping insertion in model container [2020-07-20 13:21:02,189 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:21:02" (3/3) ... [2020-07-20 13:21:02,191 INFO L109 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-07-20 13:21:02,202 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:21:02,209 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2020-07-20 13:21:02,224 INFO L251 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2020-07-20 13:21:02,250 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:21:02,250 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:21:02,250 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:21:02,251 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:21:02,251 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:21:02,251 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:21:02,251 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:21:02,251 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:21:02,272 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-07-20 13:21:02,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:21:02,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:02,280 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:02,281 INFO L427 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:02,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:02,286 INFO L82 PathProgramCache]: Analyzing trace with hash -1662209305, now seen corresponding path program 1 times [2020-07-20 13:21:02,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:02,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425557453] [2020-07-20 13:21:02,295 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 13:21:02,356 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:21:02,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:21:02,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:21:02,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:21:02,477 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 13:21:02,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:21:02,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425557453] [2020-07-20 13:21:02,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:21:02,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 13:21:02,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360183940] [2020-07-20 13:21:02,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 13:21:02,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:21:02,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 13:21:02,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-07-20 13:21:02,527 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 7 states. [2020-07-20 13:21:02,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:21:02,671 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-07-20 13:21:02,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:21:02,674 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-20 13:21:02,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:21:02,685 INFO L225 Difference]: With dead ends: 34 [2020-07-20 13:21:02,685 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 13:21:02,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:21:02,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 13:21:02,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-20 13:21:02,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-20 13:21:02,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-07-20 13:21:02,737 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 13 [2020-07-20 13:21:02,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:21:02,738 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-07-20 13:21:02,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 13:21:02,739 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-07-20 13:21:02,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 13:21:02,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:21:02,740 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:21:02,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:02,955 INFO L427 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:21:02,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:21:02,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1078403623, now seen corresponding path program 1 times [2020-07-20 13:21:02,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:21:02,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [44115262] [2020-07-20 13:21:02,958 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 13:21:02,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:21:02,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:21:02,987 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:21:02,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:21:02,998 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:21:03,011 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:21:03,012 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:21:03,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:21:03,252 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:21:03 BoogieIcfgContainer [2020-07-20 13:21:03,252 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:21:03,255 INFO L168 Benchmark]: Toolchain (without parser) took 1701.19 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 102.8 MB in the beginning and 129.9 MB in the end (delta: -27.1 MB). Peak memory consumption was 36.8 MB. Max. memory is 7.1 GB. [2020-07-20 13:21:03,257 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 13:21:03,258 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.01 ms. Allocated memory is still 137.9 MB. Free memory was 102.3 MB in the beginning and 93.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 13:21:03,259 INFO L168 Benchmark]: Boogie Preprocessor took 113.23 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 93.1 MB in the beginning and 180.8 MB in the end (delta: -87.6 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-20 13:21:03,260 INFO L168 Benchmark]: RCFGBuilder took 248.71 ms. Allocated memory is still 201.9 MB. Free memory was 180.8 MB in the beginning and 168.9 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:21:03,261 INFO L168 Benchmark]: TraceAbstraction took 1069.20 ms. Allocated memory is still 201.9 MB. Free memory was 168.9 MB in the beginning and 129.9 MB in the end (delta: 39.0 MB). Peak memory consumption was 39.0 MB. Max. memory is 7.1 GB. [2020-07-20 13:21:03,265 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 137.9 MB. Free memory was 120.9 MB in the beginning and 120.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.01 ms. Allocated memory is still 137.9 MB. Free memory was 102.3 MB in the beginning and 93.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.23 ms. Allocated memory was 137.9 MB in the beginning and 201.9 MB in the end (delta: 64.0 MB). Free memory was 93.1 MB in the beginning and 180.8 MB in the end (delta: -87.6 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 248.71 ms. Allocated memory is still 201.9 MB. Free memory was 180.8 MB in the beginning and 168.9 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1069.20 ms. Allocated memory is still 201.9 MB. Free memory was 168.9 MB in the beginning and 129.9 MB in the end (delta: 39.0 MB). Peak memory consumption was 39.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] CALL f(4) VAL [\old(n)=4] [L7] COND FALSE !(n<3) [L8] n-- VAL [\old(n)=4, n=3] [L9] CALL f2(n) VAL [\old(n)=3] [L14] COND FALSE !(n<3) [L15] n-- VAL [\old(n)=3, n=2] [L16] CALL f(n) VAL [\old(n)=2] [L7] COND TRUE n<3 VAL [\old(n)=2, n=2] [L16] RET f(n) VAL [\old(n)=3, n=2] [L17] __VERIFIER_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 23 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 3 SDslu, 48 SDs, 0 SdLazy, 28 SolverSat, 3 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s 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: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 29 NumberOfCodeBlocks, 28 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 12 ConstructedInterpolants, 0 QuantifiedInterpolants, 288 SizeOfPredicates, 3 NumberOfNonLiveVariables, 28 ConjunctsInSsa, 6 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 incorrect! Received shutdown request...