/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/reducercommutativity/rangesum.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:59:22,812 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:59:22,814 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:59:22,838 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:59:22,839 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:59:22,841 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:59:22,843 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:59:22,856 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:59:22,860 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:59:22,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:59:22,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:59:22,868 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:59:22,869 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:59:22,871 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:59:22,874 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:59:22,876 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:59:22,878 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:59:22,880 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:59:22,881 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:59:22,889 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:59:22,895 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:59:22,900 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:59:22,901 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:59:22,902 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:59:22,906 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:59:22,919 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:59:22,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:59:22,921 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:59:22,922 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 13:59:22,962 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:59:22,962 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:59:22,964 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:59:22,964 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:59:22,964 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:59:22,965 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:59:22,965 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:59:22,965 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:59:22,970 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:59:22,971 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:59:22,971 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:59:22,971 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:59:22,971 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:59:22,971 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:59:22,972 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:59:22,972 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:59:22,972 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:59:22,972 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:59:22,973 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:59:22,973 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:59:22,973 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:59:22,975 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:59:22,976 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:59:22,976 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:59:22,976 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:59:22,976 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:59:22,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:22,977 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:59:22,977 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:59:22,977 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:59:23,375 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:59:23,392 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:59:23,397 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:59:23,399 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:59:23,399 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:59:23,400 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/reducercommutativity/rangesum.i [2020-07-21 13:59:23,484 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95c404a02/4d35c5a12c1142fb8a58d2ab6c9e62d9/FLAG8d24920d6 [2020-07-21 13:59:24,027 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:59:24,029 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/reducercommutativity/rangesum.i [2020-07-21 13:59:24,037 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95c404a02/4d35c5a12c1142fb8a58d2ab6c9e62d9/FLAG8d24920d6 [2020-07-21 13:59:24,356 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95c404a02/4d35c5a12c1142fb8a58d2ab6c9e62d9 [2020-07-21 13:59:24,366 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:59:24,369 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:59:24,370 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:59:24,371 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:59:24,376 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:59:24,378 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,382 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@53f8717a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24, skipping insertion in model container [2020-07-21 13:59:24,382 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,391 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:59:24,420 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:59:24,668 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:59:24,680 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:59:24,717 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:59:24,738 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:59:24,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24 WrapperNode [2020-07-21 13:59:24,739 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:59:24,740 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:59:24,740 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:59:24,740 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:59:24,845 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,845 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,860 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,860 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,870 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,877 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,879 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (1/1) ... [2020-07-21 13:59:24,882 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:59:24,882 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:59:24,882 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:59:24,883 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:59:24,883 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (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 13:59:24,969 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:59:24,969 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:59:24,969 INFO L138 BoogieDeclarations]: Found implementation of procedure init_nondet [2020-07-21 13:59:24,969 INFO L138 BoogieDeclarations]: Found implementation of procedure rangesum [2020-07-21 13:59:24,969 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:59:24,969 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:59:24,970 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:59:24,970 INFO L130 BoogieDeclarations]: Found specification of procedure init_nondet [2020-07-21 13:59:24,970 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-21 13:59:24,970 INFO L130 BoogieDeclarations]: Found specification of procedure rangesum [2020-07-21 13:59:24,970 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-21 13:59:24,971 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:59:24,971 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 13:59:24,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 13:59:24,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:59:24,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:59:25,340 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:59:25,341 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 13:59:25,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:59:25 BoogieIcfgContainer [2020-07-21 13:59:25,346 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:59:25,348 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:59:25,348 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:59:25,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:59:25,353 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:59:24" (1/3) ... [2020-07-21 13:59:25,354 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36400a25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:59:25, skipping insertion in model container [2020-07-21 13:59:25,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:59:24" (2/3) ... [2020-07-21 13:59:25,355 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@36400a25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:59:25, skipping insertion in model container [2020-07-21 13:59:25,355 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:59:25" (3/3) ... [2020-07-21 13:59:25,357 INFO L109 eAbstractionObserver]: Analyzing ICFG rangesum.i [2020-07-21 13:59:25,373 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:59:25,382 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:59:25,400 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:59:25,435 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:59:25,436 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:59:25,436 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:59:25,436 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:59:25,436 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:59:25,436 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:59:25,437 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:59:25,437 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:59:25,465 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2020-07-21 13:59:25,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 13:59:25,472 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:25,473 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:25,474 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:25,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:25,480 INFO L82 PathProgramCache]: Analyzing trace with hash -1377249276, now seen corresponding path program 1 times [2020-07-21 13:59:25,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:25,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [524949800] [2020-07-21 13:59:25,490 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 13:59:25,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:59:25,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:25,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:59:25,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:25,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-07-21 13:59:25,745 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:59:25,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [524949800] [2020-07-21 13:59:25,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:59:25,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 13:59:25,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284672966] [2020-07-21 13:59:25,756 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 13:59:25,756 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:25,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 13:59:25,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:59:25,772 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 3 states. [2020-07-21 13:59:26,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:26,004 INFO L93 Difference]: Finished difference Result 73 states and 101 transitions. [2020-07-21 13:59:26,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 13:59:26,007 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 38 [2020-07-21 13:59:26,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:26,018 INFO L225 Difference]: With dead ends: 73 [2020-07-21 13:59:26,018 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 13:59:26,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 13:59:26,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 13:59:26,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-07-21 13:59:26,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 13:59:26,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-07-21 13:59:26,079 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 38 [2020-07-21 13:59:26,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:26,080 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-07-21 13:59:26,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 13:59:26,080 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-07-21 13:59:26,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-07-21 13:59:26,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:26,084 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:26,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:26,290 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:26,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:26,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1742767491, now seen corresponding path program 1 times [2020-07-21 13:59:26,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:26,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1747181153] [2020-07-21 13:59:26,293 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 13:59:26,401 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 13:59:26,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:26,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:59:26,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:26,471 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:59:26,472 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:59:26,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1747181153] [2020-07-21 13:59:26,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:59:26,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 13:59:26,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100325118] [2020-07-21 13:59:26,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 13:59:26,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:26,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 13:59:26,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:59:26,477 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 4 states. [2020-07-21 13:59:26,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:26,562 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2020-07-21 13:59:26,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 13:59:26,564 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 38 [2020-07-21 13:59:26,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:26,565 INFO L225 Difference]: With dead ends: 56 [2020-07-21 13:59:26,566 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 13:59:26,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:59:26,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 13:59:26,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2020-07-21 13:59:26,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 13:59:26,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-07-21 13:59:26,579 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 38 [2020-07-21 13:59:26,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:26,580 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-07-21 13:59:26,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 13:59:26,580 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-07-21 13:59:26,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 13:59:26,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:26,582 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:26,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:26,798 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:26,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:26,799 INFO L82 PathProgramCache]: Analyzing trace with hash -759897477, now seen corresponding path program 1 times [2020-07-21 13:59:26,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:26,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571310502] [2020-07-21 13:59:26,801 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 13:59:26,876 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:26,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:26,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:59:26,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:26,933 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:59:26,933 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:59:26,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571310502] [2020-07-21 13:59:26,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:59:26,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 13:59:26,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466194514] [2020-07-21 13:59:26,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 13:59:26,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:26,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 13:59:26,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:59:26,939 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 4 states. [2020-07-21 13:59:27,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:27,027 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-07-21 13:59:27,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 13:59:27,028 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 40 [2020-07-21 13:59:27,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:27,030 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:59:27,030 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 13:59:27,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:59:27,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 13:59:27,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-07-21 13:59:27,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 13:59:27,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-07-21 13:59:27,040 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 40 [2020-07-21 13:59:27,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:27,040 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-07-21 13:59:27,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 13:59:27,040 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-07-21 13:59:27,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 13:59:27,042 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:27,043 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:27,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:27,259 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:27,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:27,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1437163047, now seen corresponding path program 1 times [2020-07-21 13:59:27,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:27,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1295377276] [2020-07-21 13:59:27,261 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 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 [2020-07-21 13:59:27,336 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:27,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:27,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:59:27,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:27,411 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:59:27,412 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:59:27,576 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:59:27,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1295377276] [2020-07-21 13:59:27,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:59:27,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 8 [2020-07-21 13:59:27,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1816195898] [2020-07-21 13:59:27,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:59:27,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:27,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:59:27,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:59:27,583 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 8 states. [2020-07-21 13:59:27,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:27,747 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-07-21 13:59:27,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:59:27,748 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 42 [2020-07-21 13:59:27,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:27,750 INFO L225 Difference]: With dead ends: 69 [2020-07-21 13:59:27,750 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 13:59:27,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:59:27,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 13:59:27,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-07-21 13:59:27,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:59:27,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-07-21 13:59:27,771 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 42 [2020-07-21 13:59:27,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:27,772 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-07-21 13:59:27,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:59:27,776 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-07-21 13:59:27,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-21 13:59:27,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:27,782 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:27,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:27,997 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:27,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:27,999 INFO L82 PathProgramCache]: Analyzing trace with hash 545653175, now seen corresponding path program 2 times [2020-07-21 13:59:27,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:28,000 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003238975] [2020-07-21 13:59:28,001 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 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 [2020-07-21 13:59:28,075 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:28,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:28,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 13:59:28,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:28,108 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:59:28,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:59:28,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003238975] [2020-07-21 13:59:28,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:59:28,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 13:59:28,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1448199432] [2020-07-21 13:59:28,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 13:59:28,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:28,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 13:59:28,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:59:28,112 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 4 states. [2020-07-21 13:59:28,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:28,190 INFO L93 Difference]: Finished difference Result 67 states and 86 transitions. [2020-07-21 13:59:28,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 13:59:28,191 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 44 [2020-07-21 13:59:28,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:28,193 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:59:28,193 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 13:59:28,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-21 13:59:28,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 13:59:28,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-07-21 13:59:28,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 13:59:28,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-07-21 13:59:28,203 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 44 [2020-07-21 13:59:28,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:28,203 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-07-21 13:59:28,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 13:59:28,204 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-07-21 13:59:28,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 13:59:28,209 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:28,210 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:28,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:28,426 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:28,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:28,428 INFO L82 PathProgramCache]: Analyzing trace with hash -2870664, now seen corresponding path program 1 times [2020-07-21 13:59:28,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:28,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [894165087] [2020-07-21 13:59:28,429 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 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 [2020-07-21 13:59:28,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:28,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:28,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:59:28,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:28,597 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 14 proven. 1 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-21 13:59:28,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:59:28,704 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2020-07-21 13:59:28,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [894165087] [2020-07-21 13:59:28,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:59:28,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6] total 8 [2020-07-21 13:59:28,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361309254] [2020-07-21 13:59:28,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 13:59:28,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:28,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 13:59:28,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2020-07-21 13:59:28,708 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 8 states. [2020-07-21 13:59:28,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:28,846 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-07-21 13:59:28,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:59:28,847 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 53 [2020-07-21 13:59:28,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:28,848 INFO L225 Difference]: With dead ends: 72 [2020-07-21 13:59:28,848 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 13:59:28,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:59:28,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 13:59:28,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2020-07-21 13:59:28,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:59:28,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-07-21 13:59:28,857 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 53 [2020-07-21 13:59:28,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:28,858 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-07-21 13:59:28,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 13:59:28,858 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-07-21 13:59:28,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-21 13:59:28,860 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:28,860 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:29,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:29,076 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:29,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:29,077 INFO L82 PathProgramCache]: Analyzing trace with hash -619650601, now seen corresponding path program 2 times [2020-07-21 13:59:29,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:29,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [724886630] [2020-07-21 13:59:29,079 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 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:29,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:29,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:29,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 13:59:29,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:29,254 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-07-21 13:59:29,254 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:59:29,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [724886630] [2020-07-21 13:59:29,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:59:29,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-21 13:59:29,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369456813] [2020-07-21 13:59:29,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:59:29,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:29,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:59:29,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:59:29,257 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 9 states. [2020-07-21 13:59:29,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:29,330 INFO L93 Difference]: Finished difference Result 74 states and 89 transitions. [2020-07-21 13:59:29,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:59:29,331 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 62 [2020-07-21 13:59:29,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:29,333 INFO L225 Difference]: With dead ends: 74 [2020-07-21 13:59:29,333 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 13:59:29,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:59:29,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 13:59:29,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 56. [2020-07-21 13:59:29,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 13:59:29,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2020-07-21 13:59:29,347 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 62 [2020-07-21 13:59:29,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:29,348 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2020-07-21 13:59:29,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:59:29,349 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2020-07-21 13:59:29,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 13:59:29,350 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:29,351 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:29,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:29,566 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:29,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:29,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1679269433, now seen corresponding path program 1 times [2020-07-21 13:59:29,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:29,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332936641] [2020-07-21 13:59:29,568 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 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:29,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:29,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:29,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:59:29,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:29,748 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 66 proven. 4 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 13:59:29,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:59:29,921 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 66 proven. 4 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 13:59:29,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332936641] [2020-07-21 13:59:29,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:59:29,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2020-07-21 13:59:29,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709127584] [2020-07-21 13:59:29,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:59:29,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:29,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:59:29,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:59:29,926 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand 13 states. [2020-07-21 13:59:30,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:30,257 INFO L93 Difference]: Finished difference Result 139 states and 179 transitions. [2020-07-21 13:59:30,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:59:30,258 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 13:59:30,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:30,264 INFO L225 Difference]: With dead ends: 139 [2020-07-21 13:59:30,265 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:59:30,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 112 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:59:30,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:59:30,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-07-21 13:59:30,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-21 13:59:30,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 97 transitions. [2020-07-21 13:59:30,299 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 97 transitions. Word has length 65 [2020-07-21 13:59:30,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:30,305 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 97 transitions. [2020-07-21 13:59:30,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:59:30,305 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 97 transitions. [2020-07-21 13:59:30,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 13:59:30,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:30,308 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:30,511 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:30,512 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:30,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:30,512 INFO L82 PathProgramCache]: Analyzing trace with hash -2040052581, now seen corresponding path program 2 times [2020-07-21 13:59:30,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:30,513 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698183773] [2020-07-21 13:59:30,513 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 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:30,589 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:30,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:30,592 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:59:30,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:30,663 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 47 proven. 10 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 13:59:30,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:59:30,864 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 4 proven. 57 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 13:59:30,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698183773] [2020-07-21 13:59:30,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:59:30,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2020-07-21 13:59:30,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54110146] [2020-07-21 13:59:30,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:59:30,867 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:30,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:59:30,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:59:30,868 INFO L87 Difference]: Start difference. First operand 77 states and 97 transitions. Second operand 13 states. [2020-07-21 13:59:31,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:31,141 INFO L93 Difference]: Finished difference Result 129 states and 173 transitions. [2020-07-21 13:59:31,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:59:31,142 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 67 [2020-07-21 13:59:31,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:31,144 INFO L225 Difference]: With dead ends: 129 [2020-07-21 13:59:31,144 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:59:31,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 116 SyntacticMatches, 6 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:59:31,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:59:31,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 56. [2020-07-21 13:59:31,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 13:59:31,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 68 transitions. [2020-07-21 13:59:31,169 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 68 transitions. Word has length 67 [2020-07-21 13:59:31,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:31,176 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 68 transitions. [2020-07-21 13:59:31,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:59:31,176 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 68 transitions. [2020-07-21 13:59:31,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-21 13:59:31,178 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:31,178 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:31,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:31,396 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:31,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:31,397 INFO L82 PathProgramCache]: Analyzing trace with hash -737365673, now seen corresponding path program 1 times [2020-07-21 13:59:31,398 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:31,398 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1743770680] [2020-07-21 13:59:31,398 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 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:31,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:31,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:59:31,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 13:59:31,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:59:31,627 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 80 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 13:59:31,627 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:59:31,732 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 150 trivial. 0 not checked. [2020-07-21 13:59:31,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1743770680] [2020-07-21 13:59:31,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:59:31,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-21 13:59:31,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229739588] [2020-07-21 13:59:31,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:59:31,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:59:31,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:59:31,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:59:31,736 INFO L87 Difference]: Start difference. First operand 56 states and 68 transitions. Second operand 10 states. [2020-07-21 13:59:31,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:59:31,867 INFO L93 Difference]: Finished difference Result 86 states and 103 transitions. [2020-07-21 13:59:31,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:59:31,868 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 73 [2020-07-21 13:59:31,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:59:31,869 INFO L225 Difference]: With dead ends: 86 [2020-07-21 13:59:31,869 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 13:59:31,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:59:31,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 13:59:31,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2020-07-21 13:59:31,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 13:59:31,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 72 transitions. [2020-07-21 13:59:31,887 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 72 transitions. Word has length 73 [2020-07-21 13:59:31,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:59:31,888 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 72 transitions. [2020-07-21 13:59:31,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:59:31,888 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 72 transitions. [2020-07-21 13:59:31,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 13:59:31,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:59:31,896 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:59:32,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:32,111 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:59:32,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:59:32,112 INFO L82 PathProgramCache]: Analyzing trace with hash 132738585, now seen corresponding path program 2 times [2020-07-21 13:59:32,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:59:32,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216011564] [2020-07-21 13:59:32,112 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 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:32,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:59:32,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 13:59:32,311 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:59:32,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 13:59:32,400 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:59:32,461 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 13:59:32,462 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 13:59:32,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:59:32,776 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:59:32 BoogieIcfgContainer [2020-07-21 13:59:32,776 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:59:32,782 INFO L168 Benchmark]: Toolchain (without parser) took 8410.89 ms. Allocated memory was 138.4 MB in the beginning and 277.3 MB in the end (delta: 138.9 MB). Free memory was 103.3 MB in the beginning and 159.0 MB in the end (delta: -55.7 MB). Peak memory consumption was 83.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:59:32,786 INFO L168 Benchmark]: CDTParser took 0.39 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: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 13:59:32,787 INFO L168 Benchmark]: CACSL2BoogieTranslator took 368.93 ms. Allocated memory is still 138.4 MB. Free memory was 102.8 MB in the beginning and 92.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 13:59:32,788 INFO L168 Benchmark]: Boogie Preprocessor took 142.23 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 92.4 MB in the beginning and 179.8 MB in the end (delta: -87.4 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 13:59:32,792 INFO L168 Benchmark]: RCFGBuilder took 464.29 ms. Allocated memory is still 202.4 MB. Free memory was 179.8 MB in the beginning and 160.8 MB in the end (delta: 19.0 MB). Peak memory consumption was 19.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:59:32,793 INFO L168 Benchmark]: TraceAbstraction took 7428.39 ms. Allocated memory was 202.4 MB in the beginning and 277.3 MB in the end (delta: 75.0 MB). Free memory was 160.8 MB in the beginning and 159.0 MB in the end (delta: 1.8 MB). Peak memory consumption was 76.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:59:32,799 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39 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: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 368.93 ms. Allocated memory is still 138.4 MB. Free memory was 102.8 MB in the beginning and 92.4 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 142.23 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 92.4 MB in the beginning and 179.8 MB in the end (delta: -87.4 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 464.29 ms. Allocated memory is still 202.4 MB. Free memory was 179.8 MB in the beginning and 160.8 MB in the end (delta: 19.0 MB). Peak memory consumption was 19.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7428.39 ms. Allocated memory was 202.4 MB in the beginning and 277.3 MB in the end (delta: 75.0 MB). Free memory was 160.8 MB in the beginning and 159.0 MB in the end (delta: 1.8 MB). Peak memory consumption was 76.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 53]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L4] int N; VAL [\old(N)=5, N=0] [L32] N = __VERIFIER_nondet_int() [L33] COND TRUE N > 1 [L34] int x[N]; VAL [\old(N)=0, N=3, x={2:0}] [L35] CALL init_nondet(x) VAL [\old(N)=0, N=3, x={2:0}] [L6] int i; [L7] i = 0 VAL [\old(N)=0, i=0, N=3, x={2:0}, x={2:0}] [L7] COND TRUE i < N [L8] x[i] = __VERIFIER_nondet_int() [L7] i++ VAL [\old(N)=0, i=1, N=3, x={2:0}, x={2:0}] [L7] COND TRUE i < N [L8] x[i] = __VERIFIER_nondet_int() [L7] i++ VAL [\old(N)=0, i=2, N=3, x={2:0}, x={2:0}] [L7] COND TRUE i < N [L8] x[i] = __VERIFIER_nondet_int() [L7] i++ VAL [\old(N)=0, i=3, N=3, x={2:0}, x={2:0}] [L7] COND FALSE !(i < N) VAL [\old(N)=0, i=3, N=3, x={2:0}, x={2:0}] [L35] RET init_nondet(x) VAL [\old(N)=0, N=3, x={2:0}] [L36] int temp; [L37] int ret; [L38] int ret2; [L39] int ret5; VAL [\old(N)=0, N=3, x={2:0}] [L41] CALL, EXPR rangesum(x) VAL [\old(N)=0, N=3, x={2:0}] [L14] int i; [L15] long long ret; [L16] ret = 0 [L17] int cnt = 0; [L18] i = 0 VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND FALSE !(i > N/2) VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND FALSE !(i > N/2) VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=0, i=2, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=2, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND TRUE i > N/2 [L20] EXPR x[i] [L20] ret = ret + x[i] [L21] cnt = cnt + 1 VAL [\old(N)=0, cnt=1, i=2, N=3, ret=2147483645, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=1, i=3, N=3, ret=2147483645, x={2:0}, x={2:0}] [L18] COND FALSE !(i < N) VAL [\old(N)=0, cnt=1, i=3, N=3, ret=2147483645, x={2:0}, x={2:0}] [L24] COND TRUE cnt !=0 [L25] return ret / cnt; VAL [\old(N)=0, \result=2147483645, cnt=1, i=3, N=3, ret=2147483645, x={2:0}, x={2:0}] [L41] RET, EXPR rangesum(x) VAL [\old(N)=0, N=3, rangesum(x)=2147483645, x={2:0}] [L41] ret = rangesum(x) [L43] EXPR x[0] [L43] temp=x[0] [L43] EXPR x[1] [L43] x[0] = x[1] [L43] x[1] = temp VAL [\old(N)=0, N=3, ret=2147483645, temp=2147483646, x={2:0}] [L44] CALL, EXPR rangesum(x) VAL [\old(N)=0, N=3, x={2:0}] [L14] int i; [L15] long long ret; [L16] ret = 0 [L17] int cnt = 0; [L18] i = 0 VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND FALSE !(i > N/2) VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND FALSE !(i > N/2) VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=0, i=2, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=2, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND TRUE i > N/2 [L20] EXPR x[i] [L20] ret = ret + x[i] [L21] cnt = cnt + 1 VAL [\old(N)=0, cnt=1, i=2, N=3, ret=2147483645, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=1, i=3, N=3, ret=2147483645, x={2:0}, x={2:0}] [L18] COND FALSE !(i < N) VAL [\old(N)=0, cnt=1, i=3, N=3, ret=2147483645, x={2:0}, x={2:0}] [L24] COND TRUE cnt !=0 [L25] return ret / cnt; VAL [\old(N)=0, \result=2147483645, cnt=1, i=3, N=3, ret=2147483645, x={2:0}, x={2:0}] [L44] RET, EXPR rangesum(x) VAL [\old(N)=0, N=3, rangesum(x)=2147483645, ret=2147483645, temp=2147483646, x={2:0}] [L44] ret2 = rangesum(x) [L45] EXPR x[0] [L45] temp=x[0] [L46] int i =0 ; VAL [\old(N)=0, i=0, N=3, ret=2147483645, ret2=2147483645, temp=2147483647, x={2:0}] [L46] COND TRUE i N/2) VAL [\old(N)=0, cnt=0, i=0, N=3, ret=0, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND FALSE !(i > N/2) VAL [\old(N)=0, cnt=0, i=1, N=3, ret=0, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=0, i=2, N=3, ret=0, x={2:0}, x={2:0}] [L18] COND TRUE i < N VAL [\old(N)=0, cnt=0, i=2, N=3, ret=0, x={2:0}, x={2:0}] [L19] COND TRUE i > N/2 [L20] EXPR x[i] [L20] ret = ret + x[i] [L21] cnt = cnt + 1 VAL [\old(N)=0, cnt=1, i=2, N=3, ret=2147483647, x={2:0}, x={2:0}] [L18] i++ VAL [\old(N)=0, cnt=1, i=3, N=3, ret=2147483647, x={2:0}, x={2:0}] [L18] COND FALSE !(i < N) VAL [\old(N)=0, cnt=1, i=3, N=3, ret=2147483647, x={2:0}, x={2:0}] [L24] COND TRUE cnt !=0 [L25] return ret / cnt; VAL [\old(N)=0, \result=2147483647, cnt=1, i=3, N=3, ret=2147483647, x={2:0}, x={2:0}] [L50] RET, EXPR rangesum(x) VAL [\old(N)=0, i=2, N=3, rangesum(x)=2147483647, ret=2147483645, ret2=2147483645, temp=2147483647, x={2:0}] [L50] ret5 = rangesum(x) [L52] COND TRUE ret != ret2 || ret !=ret5 VAL [\old(N)=0, i=2, N=3, ret=2147483645, ret2=2147483645, ret5=2147483647, temp=2147483647, x={2:0}] [L53] __VERIFIER_error() VAL [\old(N)=0, i=2, N=3, ret=2147483645, ret2=2147483645, ret5=2147483647, temp=2147483647, x={2:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 39 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.2s, OverallIterations: 11, TraceHistogramMax: 9, AutomataDifference: 1.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 329 SDtfs, 275 SDslu, 734 SDs, 0 SdLazy, 754 SolverSat, 51 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 822 GetRequests, 735 SyntacticMatches, 22 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=77occurred in iteration=8, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 40 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 597 NumberOfCodeBlocks, 559 NumberOfCodeBlocksAsserted, 20 NumberOfCheckSat, 807 ConstructedInterpolants, 0 QuantifiedInterpolants, 94601 SizeOfPredicates, 22 NumberOfNonLiveVariables, 1782 ConjunctsInSsa, 62 ConjunctsInUnsatCore, 15 InterpolantComputations, 5 PerfectInterpolantSequences, 896/1005 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...