/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/Addition02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:07:38,306 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:07:38,308 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:07:38,320 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:07:38,321 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:07:38,322 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:07:38,323 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:07:38,325 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:07:38,327 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:07:38,327 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:07:38,328 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:07:38,329 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:07:38,330 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:07:38,331 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:07:38,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:07:38,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:07:38,334 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:07:38,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:07:38,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:07:38,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:07:38,339 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:07:38,340 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:07:38,341 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:07:38,342 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:07:38,345 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:07:38,352 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:07:38,353 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:07:38,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:07:38,355 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 13:07:38,369 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:07:38,369 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:07:38,370 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:07:38,370 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:07:38,371 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:07:38,371 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:07:38,371 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:07:38,371 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:07:38,371 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:07:38,372 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:07:38,372 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:07:38,372 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:07:38,372 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:07:38,372 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:07:38,373 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:07:38,373 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:07:38,373 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:07:38,373 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:07:38,373 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:07:38,373 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:07:38,374 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:07:38,374 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:07:38,374 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:07:38,374 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:07:38,375 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:07:38,375 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:07:38,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:07:38,375 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:07:38,375 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:07:38,375 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 13:07:38,665 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:07:38,678 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:07:38,682 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:07:38,684 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:07:38,684 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:07:38,685 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Addition02.c [2020-07-20 13:07:38,764 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d75a7330e/25b7221322a045209886eebfc9e74130/FLAG7f321a990 [2020-07-20 13:07:39,265 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:07:39,266 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Addition02.c [2020-07-20 13:07:39,275 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d75a7330e/25b7221322a045209886eebfc9e74130/FLAG7f321a990 [2020-07-20 13:07:39,626 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d75a7330e/25b7221322a045209886eebfc9e74130 [2020-07-20 13:07:39,635 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:07:39,639 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:07:39,640 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:07:39,640 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:07:39,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:07:39,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,647 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@550c1f6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39, skipping insertion in model container [2020-07-20 13:07:39,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:07:39,674 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:07:39,843 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:07:39,847 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:07:39,865 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:07:39,877 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:07:39,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39 WrapperNode [2020-07-20 13:07:39,878 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:07:39,879 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:07:39,879 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:07:39,879 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:07:39,891 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,896 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,897 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,900 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,902 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,903 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (1/1) ... [2020-07-20 13:07:39,905 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:07:39,905 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:07:39,906 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:07:39,906 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:07:39,907 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (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 13:07:40,063 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:07:40,063 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:07:40,063 INFO L138 BoogieDeclarations]: Found implementation of procedure addition [2020-07-20 13:07:40,063 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:07:40,063 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:07:40,063 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:07:40,064 INFO L130 BoogieDeclarations]: Found specification of procedure addition [2020-07-20 13:07:40,064 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:07:40,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:07:40,064 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:07:40,281 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:07:40,281 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:07:40,285 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:07:40 BoogieIcfgContainer [2020-07-20 13:07:40,286 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:07:40,287 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:07:40,287 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:07:40,290 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:07:40,291 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:07:39" (1/3) ... [2020-07-20 13:07:40,291 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76d66f79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:07:40, skipping insertion in model container [2020-07-20 13:07:40,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:07:39" (2/3) ... [2020-07-20 13:07:40,292 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@76d66f79 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:07:40, skipping insertion in model container [2020-07-20 13:07:40,292 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:07:40" (3/3) ... [2020-07-20 13:07:40,294 INFO L109 eAbstractionObserver]: Analyzing ICFG Addition02.c [2020-07-20 13:07:40,305 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:07:40,314 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:07:40,329 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:07:40,374 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:07:40,375 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:07:40,375 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:07:40,375 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:07:40,376 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:07:40,376 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:07:40,376 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:07:40,376 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:07:40,402 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-20 13:07:40,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 13:07:40,409 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:07:40,411 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:07:40,411 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:07:40,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:07:40,420 INFO L82 PathProgramCache]: Analyzing trace with hash -854965079, now seen corresponding path program 1 times [2020-07-20 13:07:40,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:07:40,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [974089070] [2020-07-20 13:07:40,431 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 13:07:40,509 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:07:40,510 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:07:40,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 13:07:40,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:07:40,673 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 13:07:40,674 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:07:40,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [974089070] [2020-07-20 13:07:40,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:07:40,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 13:07:40,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842617142] [2020-07-20 13:07:40,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 13:07:40,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:07:40,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 13:07:40,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2020-07-20 13:07:40,703 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 7 states. [2020-07-20 13:07:40,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:07:40,870 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2020-07-20 13:07:40,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:07:40,872 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-07-20 13:07:40,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:07:40,884 INFO L225 Difference]: With dead ends: 40 [2020-07-20 13:07:40,885 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:07:40,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 13:07:40,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:07:40,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 13:07:40,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:07:40,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-07-20 13:07:40,939 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2020-07-20 13:07:40,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:07:40,940 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-07-20 13:07:40,940 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 13:07:40,940 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-07-20 13:07:40,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 13:07:40,943 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:07:40,943 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:07:41,157 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:07:41,157 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:07:41,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:07:41,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1632999070, now seen corresponding path program 1 times [2020-07-20 13:07:41,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:07:41,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473656661] [2020-07-20 13:07:41,160 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 13:07:41,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 13:07:41,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:07:41,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 13:07:41,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:07:41,226 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 13:07:41,226 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:07:41,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473656661] [2020-07-20 13:07:41,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:07:41,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 13:07:41,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809161652] [2020-07-20 13:07:41,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 13:07:41,232 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:07:41,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 13:07:41,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 13:07:41,234 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 4 states. [2020-07-20 13:07:41,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:07:41,286 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2020-07-20 13:07:41,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 13:07:41,288 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2020-07-20 13:07:41,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:07:41,290 INFO L225 Difference]: With dead ends: 34 [2020-07-20 13:07:41,290 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 13:07:41,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 13:07:41,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 13:07:41,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-07-20 13:07:41,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:07:41,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2020-07-20 13:07:41,310 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 17 [2020-07-20 13:07:41,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:07:41,311 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2020-07-20 13:07:41,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 13:07:41,311 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2020-07-20 13:07:41,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 13:07:41,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:07:41,315 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] [2020-07-20 13:07:41,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:07:41,531 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:07:41,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:07:41,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1746800232, now seen corresponding path program 1 times [2020-07-20 13:07:41,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:07:41,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506237299] [2020-07-20 13:07:41,533 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 13:07:41,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:07:41,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:07:41,574 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:07:41,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:07:41,592 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:07:41,627 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:07:41,629 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:07:41,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:07:41,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:07:41 BoogieIcfgContainer [2020-07-20 13:07:41,873 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:07:41,876 INFO L168 Benchmark]: Toolchain (without parser) took 2238.13 ms. Allocated memory was 143.1 MB in the beginning and 200.3 MB in the end (delta: 57.1 MB). Free memory was 101.0 MB in the beginning and 104.9 MB in the end (delta: -3.9 MB). Peak memory consumption was 53.3 MB. Max. memory is 7.1 GB. [2020-07-20 13:07:41,877 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 143.1 MB. Free memory was 119.3 MB in the beginning and 119.1 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 13:07:41,878 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.76 ms. Allocated memory is still 143.1 MB. Free memory was 100.8 MB in the beginning and 91.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:07:41,879 INFO L168 Benchmark]: Boogie Preprocessor took 26.29 ms. Allocated memory is still 143.1 MB. Free memory was 91.2 MB in the beginning and 89.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:07:41,880 INFO L168 Benchmark]: RCFGBuilder took 380.32 ms. Allocated memory was 143.1 MB in the beginning and 200.3 MB in the end (delta: 57.1 MB). Free memory was 89.8 MB in the beginning and 166.8 MB in the end (delta: -77.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-20 13:07:41,881 INFO L168 Benchmark]: TraceAbstraction took 1586.17 ms. Allocated memory is still 200.3 MB. Free memory was 166.1 MB in the beginning and 104.9 MB in the end (delta: 61.2 MB). Peak memory consumption was 61.2 MB. Max. memory is 7.1 GB. [2020-07-20 13:07:41,886 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 143.1 MB. Free memory was 119.3 MB in the beginning and 119.1 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 238.76 ms. Allocated memory is still 143.1 MB. Free memory was 100.8 MB in the beginning and 91.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 26.29 ms. Allocated memory is still 143.1 MB. Free memory was 91.2 MB in the beginning and 89.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 380.32 ms. Allocated memory was 143.1 MB in the beginning and 200.3 MB in the end (delta: 57.1 MB). Free memory was 89.8 MB in the beginning and 166.8 MB in the end (delta: -77.0 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1586.17 ms. Allocated memory is still 200.3 MB. Free memory was 166.1 MB in the beginning and 104.9 MB in the end (delta: 61.2 MB). Peak memory consumption was 61.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L27] int m = __VERIFIER_nondet_int(); [L28] COND FALSE !(m < 0 || m > 1073741823) [L33] int n = __VERIFIER_nondet_int(); [L34] COND FALSE !(n < 0 || n > 1073741823) VAL [m=0, n=1] [L39] CALL, EXPR addition(m,n) VAL [\old(m)=0, \old(n)=1] [L14] COND FALSE !(n == 0) VAL [\old(m)=0, \old(n)=1, m=0, n=1] [L17] COND TRUE n > 0 VAL [\old(m)=0, \old(n)=1, m=0, n=1] [L18] CALL, EXPR addition(m+1, n-1) VAL [\old(m)=1, \old(n)=0] [L14] COND TRUE n == 0 [L15] return m; VAL [\old(m)=1, \old(n)=0, \result=1, m=1, n=0] [L18] RET, EXPR addition(m+1, n-1) VAL [\old(m)=0, \old(n)=1, addition(m+1, n-1)=1, m=0, n=1] [L18] return addition(m+1, n-1); [L39] RET, EXPR addition(m,n) VAL [addition(m,n)=1, m=0, n=1] [L39] int result = addition(m,n); [L40] COND FALSE !(result == m - n) VAL [m=0, n=1, result=1] [L43] __VERIFIER_error() VAL [m=0, n=1, result=1] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 51 SDtfs, 28 SDslu, 68 SDs, 0 SdLazy, 68 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=26occurred 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, 2 MinimizatonAttempts, 2 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 54 NumberOfCodeBlocks, 47 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 30 ConstructedInterpolants, 0 QuantifiedInterpolants, 1144 SizeOfPredicates, 6 NumberOfNonLiveVariables, 77 ConjunctsInSsa, 18 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 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...