/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:57:11,282 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:57:11,285 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:57:11,298 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:57:11,298 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:57:11,299 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:57:11,301 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:57:11,303 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:57:11,304 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:57:11,305 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:57:11,306 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:57:11,307 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:57:11,308 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:57:11,309 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:57:11,310 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:57:11,311 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:57:11,312 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:57:11,313 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:57:11,315 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:57:11,317 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:57:11,318 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:57:11,320 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:57:11,321 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:57:11,321 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:57:11,324 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:57:11,332 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:57:11,333 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:57:11,334 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:57:11,334 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:57:11,350 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:57:11,350 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:57:11,351 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:57:11,352 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:57:11,352 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:57:11,352 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:57:11,352 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:57:11,353 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:57:11,353 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:57:11,353 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:57:11,353 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:57:11,353 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:57:11,354 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:57:11,354 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:57:11,354 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:57:11,354 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:57:11,354 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:57:11,355 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:57:11,355 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:57:11,355 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:57:11,355 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:57:11,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:57:11,355 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:57:11,356 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:57:11,356 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:57:11,356 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:57:11,356 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:11,356 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:57:11,357 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:57:11,357 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:57:11,687 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:57:11,705 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:57:11,709 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:57:11,712 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:57:11,716 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:57:11,717 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-07-20 16:57:11,805 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/162d1a772/cc9480af7b234d228738298065bf3274/FLAG192d47015 [2020-07-20 16:57:12,286 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:57:12,286 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-07-20 16:57:12,295 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/162d1a772/cc9480af7b234d228738298065bf3274/FLAG192d47015 [2020-07-20 16:57:12,632 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/162d1a772/cc9480af7b234d228738298065bf3274 [2020-07-20 16:57:12,643 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:57:12,647 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:57:12,648 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:57:12,648 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:57:12,652 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:57:12,653 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,656 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@674ad9df and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12, skipping insertion in model container [2020-07-20 16:57:12,657 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,665 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:57:12,680 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:57:12,837 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:57:12,842 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:57:12,855 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:57:12,866 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:57:12,867 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12 WrapperNode [2020-07-20 16:57:12,867 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:57:12,867 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:57:12,868 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:57:12,868 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:57:12,878 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,878 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,883 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,884 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,887 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,889 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,889 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... [2020-07-20 16:57:12,890 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:57:12,891 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:57:12,891 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:57:12,891 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:57:12,892 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:57:13,049 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:57:13,049 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:57:13,049 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 16:57:13,049 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:57:13,049 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:57:13,050 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:57:13,050 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 16:57:13,050 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:57:13,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:57:13,050 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:57:13,266 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:57:13,267 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:57:13,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:57:13 BoogieIcfgContainer [2020-07-20 16:57:13,271 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:57:13,272 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:57:13,273 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:57:13,276 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:57:13,276 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:57:12" (1/3) ... [2020-07-20 16:57:13,278 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7379d08a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:57:13, skipping insertion in model container [2020-07-20 16:57:13,278 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:57:12" (2/3) ... [2020-07-20 16:57:13,278 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7379d08a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:57:13, skipping insertion in model container [2020-07-20 16:57:13,279 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:57:13" (3/3) ... [2020-07-20 16:57:13,280 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-07-20 16:57:13,293 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:57:13,301 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:57:13,317 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:57:13,345 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:57:13,346 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:57:13,347 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:57:13,347 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:57:13,347 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:57:13,347 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:57:13,347 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:57:13,348 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:57:13,370 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 16:57:13,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:57:13,381 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:13,382 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:13,382 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:13,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:13,389 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 16:57:13,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:13,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736657476] [2020-07-20 16:57:13,397 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:13,510 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:13,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:13,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:57:13,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:13,635 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:57:13,635 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:57:13,636 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1736657476] [2020-07-20 16:57:13,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:57:13,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:57:13,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374753233] [2020-07-20 16:57:13,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:57:13,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:13,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:57:13,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:57:13,657 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 16:57:13,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:13,757 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 16:57:13,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:57:13,759 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:57:13,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:13,771 INFO L225 Difference]: With dead ends: 30 [2020-07-20 16:57:13,771 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 16:57:13,775 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 [2020-07-20 16:57:13,795 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 16:57:13,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 16:57:13,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 16:57:13,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 16:57:13,827 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 16:57:13,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:13,828 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 16:57:13,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:57:13,828 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 16:57:13,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 16:57:13,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:13,831 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:14,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:14,046 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:14,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:14,047 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 16:57:14,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:14,048 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [550258997] [2020-07-20 16:57:14,049 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 16:57:14,083 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:14,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:14,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:57:14,087 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:14,133 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 16:57:14,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:14,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:14,354 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:57:14,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [550258997] [2020-07-20 16:57:14,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:14,356 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 16:57:14,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2147092626] [2020-07-20 16:57:14,358 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:57:14,358 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:14,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:57:14,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:57:14,359 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-20 16:57:14,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:14,435 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 16:57:14,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:57:14,436 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-20 16:57:14,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:14,437 INFO L225 Difference]: With dead ends: 25 [2020-07-20 16:57:14,437 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 16:57:14,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:57:14,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 16:57:14,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 16:57:14,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 16:57:14,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 16:57:14,447 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 16:57:14,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:14,447 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 16:57:14,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:57:14,448 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 16:57:14,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 16:57:14,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:14,449 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:14,662 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:14,663 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:14,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:14,665 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-20 16:57:14,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:14,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117416002] [2020-07-20 16:57:14,667 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 16:57:14,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:14,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:14,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:57:14,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:14,766 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 16:57:14,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:15,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,093 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:57:15,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117416002] [2020-07-20 16:57:15,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:15,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 16:57:15,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [525071135] [2020-07-20 16:57:15,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:57:15,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:15,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:57:15,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:57:15,097 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-20 16:57:15,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:15,163 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-20 16:57:15,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:57:15,163 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-20 16:57:15,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:15,165 INFO L225 Difference]: With dead ends: 28 [2020-07-20 16:57:15,165 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 16:57:15,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:57:15,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 16:57:15,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 16:57:15,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:57:15,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 16:57:15,173 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-20 16:57:15,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:15,173 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 16:57:15,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:57:15,173 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 16:57:15,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:57:15,175 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:15,175 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:15,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:15,389 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:15,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:15,390 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-20 16:57:15,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:15,391 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257202819] [2020-07-20 16:57:15,391 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:15,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:15,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:15,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:57:15,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:15,486 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 16:57:15,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:15,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:15,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:16,006 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:57:16,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257202819] [2020-07-20 16:57:16,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:16,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 16:57:16,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689515089] [2020-07-20 16:57:16,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:57:16,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:16,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:57:16,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:57:16,010 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-20 16:57:16,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:16,120 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-20 16:57:16,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:57:16,121 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-20 16:57:16,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:16,123 INFO L225 Difference]: With dead ends: 31 [2020-07-20 16:57:16,123 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 16:57:16,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:57:16,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 16:57:16,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 16:57:16,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 16:57:16,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 16:57:16,130 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-20 16:57:16,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:16,130 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 16:57:16,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:57:16,131 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 16:57:16,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 16:57:16,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:16,132 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:16,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:16,335 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:16,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:16,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-20 16:57:16,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:16,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664910173] [2020-07-20 16:57:16,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:16,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:57:16,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:57:16,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:57:16,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:57:16,446 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:57:16,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:57:16,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:16,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:57:17,303 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 16:57:17,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664910173] [2020-07-20 16:57:17,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:57:17,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-20 16:57:17,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1039204399] [2020-07-20 16:57:17,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:57:17,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:57:17,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:57:17,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:57:17,311 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 14 states. [2020-07-20 16:57:17,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:57:17,422 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-20 16:57:17,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:57:17,422 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2020-07-20 16:57:17,423 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:57:17,424 INFO L225 Difference]: With dead ends: 34 [2020-07-20 16:57:17,424 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:57:17,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-20 16:57:17,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:57:17,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:57:17,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:57:17,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-20 16:57:17,431 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-20 16:57:17,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:57:17,431 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-20 16:57:17,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:57:17,432 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-20 16:57:17,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 16:57:17,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:57:17,433 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:57:17,634 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:17,635 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:57:17,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:57:17,636 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-20 16:57:17,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:57:17,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1147008471] [2020-07-20 16:57:17,637 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:17,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:57:17,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:57:17,681 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:57:17,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:57:17,692 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:57:17,707 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:57:17,708 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:57:17,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:57:17,949 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:57:17 BoogieIcfgContainer [2020-07-20 16:57:17,950 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:57:17,952 INFO L168 Benchmark]: Toolchain (without parser) took 5306.69 ms. Allocated memory was 138.4 MB in the beginning and 246.4 MB in the end (delta: 108.0 MB). Free memory was 103.7 MB in the beginning and 137.5 MB in the end (delta: -33.8 MB). Peak memory consumption was 74.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:17,953 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-20 16:57:17,954 INFO L168 Benchmark]: CACSL2BoogieTranslator took 219.29 ms. Allocated memory is still 138.4 MB. Free memory was 103.3 MB in the beginning and 94.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:17,955 INFO L168 Benchmark]: Boogie Preprocessor took 22.99 ms. Allocated memory is still 138.4 MB. Free memory was 94.2 MB in the beginning and 92.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:17,956 INFO L168 Benchmark]: RCFGBuilder took 380.37 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 92.8 MB in the beginning and 170.5 MB in the end (delta: -77.7 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:17,957 INFO L168 Benchmark]: TraceAbstraction took 4677.40 ms. Allocated memory was 201.9 MB in the beginning and 246.4 MB in the end (delta: 44.6 MB). Free memory was 169.9 MB in the beginning and 137.5 MB in the end (delta: 32.3 MB). Peak memory consumption was 76.9 MB. Max. memory is 7.1 GB. [2020-07-20 16:57:17,961 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 219.29 ms. Allocated memory is still 138.4 MB. Free memory was 103.3 MB in the beginning and 94.2 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.99 ms. Allocated memory is still 138.4 MB. Free memory was 94.2 MB in the beginning and 92.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 380.37 ms. Allocated memory was 138.4 MB in the beginning and 201.9 MB in the end (delta: 63.4 MB). Free memory was 92.8 MB in the beginning and 170.5 MB in the end (delta: -77.7 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4677.40 ms. Allocated memory was 201.9 MB in the beginning and 246.4 MB in the end (delta: 44.6 MB). Free memory was 169.9 MB in the beginning and 137.5 MB in the end (delta: 32.3 MB). Peak memory consumption was 76.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 5; VAL [input=5] [L11] CALL, EXPR id(input) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=5, input=5] [L11] int result = id(input); [L12] COND TRUE result == 5 VAL [input=5, result=5] [L13] __VERIFIER_error() VAL [input=5, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.5s, OverallIterations: 6, TraceHistogramMax: 6, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 69 SDtfs, 128 SDslu, 256 SDs, 0 SdLazy, 140 SolverSat, 41 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 247 GetRequests, 161 SyntacticMatches, 29 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 168 NumberOfCodeBlocks, 145 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 228 ConstructedInterpolants, 0 QuantifiedInterpolants, 16992 SizeOfPredicates, 20 NumberOfNonLiveVariables, 273 ConjunctsInSsa, 40 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 70/200 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...