/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:14:04,211 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:14:04,213 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:14:04,226 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:14:04,226 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:14:04,227 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:14:04,228 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:14:04,230 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:14:04,232 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:14:04,232 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:14:04,233 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:14:04,234 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:14:04,235 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:14:04,236 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:14:04,237 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:14:04,238 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:14:04,239 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:14:04,239 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:14:04,241 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:14:04,243 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:14:04,245 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:14:04,246 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:14:04,247 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:14:04,248 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:14:04,250 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:14:04,258 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:14:04,258 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:14:04,259 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:14:04,260 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 [2020-07-21 16:14:04,274 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:14:04,274 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:14:04,275 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:14:04,276 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:14:04,276 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:14:04,276 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:14:04,276 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:14:04,276 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:14:04,277 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:14:04,277 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:14:04,277 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:14:04,277 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:14:04,277 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:14:04,278 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:14:04,278 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:14:04,278 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:14:04,278 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:14:04,278 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:14:04,279 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:14:04,279 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:14:04,279 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:14:04,279 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:14:04,279 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:14:04,280 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:14:04,280 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:14:04,280 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:14:04,280 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:04,280 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:14:04,280 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:14:04,281 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 -> 2 [2020-07-21 16:14:04,540 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:14:04,555 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:14:04,558 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:14:04,559 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:14:04,559 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:14:04,560 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-07-21 16:14:04,635 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d79213de6/a87968518ae04b0a80438b749a22aef4/FLAG7a9e5bc4a [2020-07-21 16:14:05,049 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:14:05,050 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/sum_2x3-1.c [2020-07-21 16:14:05,056 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d79213de6/a87968518ae04b0a80438b749a22aef4/FLAG7a9e5bc4a [2020-07-21 16:14:05,445 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d79213de6/a87968518ae04b0a80438b749a22aef4 [2020-07-21 16:14:05,453 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:14:05,455 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:14:05,457 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:14:05,457 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:14:05,460 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:14:05,461 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,464 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a8700ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05, skipping insertion in model container [2020-07-21 16:14:05,464 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,471 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:14:05,488 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:14:05,649 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:14:05,653 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:14:05,668 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:14:05,678 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:14:05,679 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05 WrapperNode [2020-07-21 16:14:05,679 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:14:05,680 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:14:05,680 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:14:05,680 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:14:05,689 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,690 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,694 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,694 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,697 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,699 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,700 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (1/1) ... [2020-07-21 16:14:05,701 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:14:05,702 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:14:05,702 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:14:05,702 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:14:05,705 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (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 [2020-07-21 16:14:05,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:14:05,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:14:05,843 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-07-21 16:14:05,843 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:14:05,843 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:14:05,843 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-07-21 16:14:05,843 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:14:05,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:14:05,844 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:14:05,999 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:14:05,999 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:14:06,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:14:06 BoogieIcfgContainer [2020-07-21 16:14:06,004 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:14:06,005 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:14:06,005 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:14:06,009 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:14:06,009 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:14:05" (1/3) ... [2020-07-21 16:14:06,010 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41c76d5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:14:06, skipping insertion in model container [2020-07-21 16:14:06,010 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:14:05" (2/3) ... [2020-07-21 16:14:06,011 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41c76d5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:14:06, skipping insertion in model container [2020-07-21 16:14:06,011 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:14:06" (3/3) ... [2020-07-21 16:14:06,013 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_2x3-1.c [2020-07-21 16:14:06,045 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:14:06,054 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:14:06,091 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:14:06,138 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:14:06,139 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:14:06,139 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:14:06,139 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:14:06,139 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:14:06,139 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:14:06,139 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:14:06,140 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:14:06,154 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 16:14:06,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:14:06,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:06,161 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:14:06,161 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:06,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:06,166 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-07-21 16:14:06,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:06,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367029844] [2020-07-21 16:14:06,174 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:14:06,232 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:14:06,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:14:06,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:14:06,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:14:06,317 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:14:06,317 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:14:06,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367029844] [2020-07-21 16:14:06,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:14:06,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:14:06,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503809847] [2020-07-21 16:14:06,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:14:06,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:14:06,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:14:06,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:14:06,339 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-21 16:14:06,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:14:06,430 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-21 16:14:06,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:14:06,432 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:14:06,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:14:06,442 INFO L225 Difference]: With dead ends: 30 [2020-07-21 16:14:06,443 INFO L226 Difference]: Without dead ends: 18 [2020-07-21 16:14:06,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:14:06,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-21 16:14:06,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-21 16:14:06,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-21 16:14:06,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-21 16:14:06,486 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-21 16:14:06,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:14:06,487 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-21 16:14:06,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:14:06,487 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-21 16:14:06,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 16:14:06,489 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:06,489 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:14:06,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:06,704 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:06,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:06,706 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-07-21 16:14:06,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:06,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901564695] [2020-07-21 16:14:06,708 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:14:06,737 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:14:06,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:14:06,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:14:06,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:14:06,804 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 16:14:06,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:14:06,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:14:07,016 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:14:07,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901564695] [2020-07-21 16:14:07,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:14:07,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-21 16:14:07,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018239100] [2020-07-21 16:14:07,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:14:07,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:14:07,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:14:07,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:14:07,022 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2020-07-21 16:14:07,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:14:07,081 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-21 16:14:07,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:14:07,082 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-21 16:14:07,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:14:07,084 INFO L225 Difference]: With dead ends: 25 [2020-07-21 16:14:07,084 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 16:14:07,086 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:14:07,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 16:14:07,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 16:14:07,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:14:07,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-21 16:14:07,093 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-21 16:14:07,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:14:07,093 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-21 16:14:07,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:14:07,094 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-21 16:14:07,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:14:07,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:14:07,095 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:14:07,310 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:07,310 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:14:07,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:14:07,311 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-07-21 16:14:07,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:14:07,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970045948] [2020-07-21 16:14:07,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 [2020-07-21 16:14:07,345 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:14:07,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:14:07,346 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:14:07,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:14:07,357 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:14:07,373 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:14:07,373 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:14:07,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:14:07,614 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:14:07 BoogieIcfgContainer [2020-07-21 16:14:07,614 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:14:07,617 INFO L168 Benchmark]: Toolchain (without parser) took 2161.55 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 102.1 MB in the beginning and 92.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 72.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:07,618 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-21 16:14:07,619 INFO L168 Benchmark]: CACSL2BoogieTranslator took 222.90 ms. Allocated memory is still 136.8 MB. Free memory was 101.7 MB in the beginning and 92.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:07,620 INFO L168 Benchmark]: Boogie Preprocessor took 21.57 ms. Allocated memory is still 136.8 MB. Free memory was 92.5 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:07,621 INFO L168 Benchmark]: RCFGBuilder took 302.27 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 91.2 MB in the beginning and 168.6 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:07,622 INFO L168 Benchmark]: TraceAbstraction took 1609.09 ms. Allocated memory is still 200.3 MB. Free memory was 167.9 MB in the beginning and 92.6 MB in the end (delta: 75.2 MB). Peak memory consumption was 75.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:14:07,626 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 136.8 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 222.90 ms. Allocated memory is still 136.8 MB. Free memory was 101.7 MB in the beginning and 92.5 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 21.57 ms. Allocated memory is still 136.8 MB. Free memory was 92.5 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 302.27 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 91.2 MB in the beginning and 168.6 MB in the end (delta: -77.4 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1609.09 ms. Allocated memory is still 200.3 MB. Free memory was 167.9 MB in the beginning and 92.6 MB in the end (delta: 75.2 MB). Peak memory consumption was 75.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 2; [L13] int b = 3; VAL [a=2, b=3] [L14] CALL, EXPR sum(a, b) VAL [\old(m)=3, \old(n)=2] [L4] COND FALSE !(n <= 0) VAL [\old(m)=3, \old(n)=2, m=3, n=2] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1] [L4] COND FALSE !(n <= 0) VAL [\old(m)=4, \old(n)=1, m=4, n=1] [L7] CALL, EXPR sum(n - 1, m + 1) VAL [\old(m)=5, \old(n)=0] [L4] COND TRUE n <= 0 [L5] return m + n; VAL [\old(m)=5, \old(n)=0, \result=5, m=5, n=0] [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=4, \old(n)=1, m=4, n=1, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) VAL [\old(m)=3, \old(n)=2, m=3, n=2, sum(n - 1, m + 1)=5] [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) VAL [a=2, b=3, sum(a, b)=5] [L14] int result = sum(a, b); [L15] COND TRUE result == a + b VAL [a=2, b=3, result=5] [L16] __VERIFIER_error() VAL [a=2, b=3, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 26 SDslu, 58 SDs, 0 SdLazy, 46 SolverSat, 4 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=2, 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, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 57 NumberOfCodeBlocks, 42 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 48 ConstructedInterpolants, 0 QuantifiedInterpolants, 1752 SizeOfPredicates, 5 NumberOfNonLiveVariables, 66 ConjunctsInSsa, 10 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 3/8 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...