/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 BIGGEST_EQUIVALENCE_CLASS --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/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:11:06,742 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:11:06,746 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:11:06,770 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:11:06,770 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:11:06,773 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:11:06,775 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:11:06,777 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:11:06,779 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:11:06,782 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:11:06,784 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:11:06,787 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:11:06,788 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:11:06,790 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:11:06,791 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:11:06,792 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:11:06,795 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:11:06,797 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:11:06,799 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:11:06,802 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:11:06,806 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:11:06,807 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:11:06,809 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:11:06,809 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:11:06,814 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:11:06,825 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:11:06,826 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:11:06,827 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:11:06,828 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 23:11:06,861 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:11:06,862 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:11:06,865 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:11:06,866 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:11:06,866 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:11:06,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:11:06,867 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:11:06,867 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:11:06,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:11:06,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:11:06,869 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:11:06,869 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:11:06,870 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:11:06,870 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:11:06,870 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:11:06,871 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:11:06,871 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:11:06,871 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:11:06,871 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:11:06,871 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:11:06,872 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:11:06,872 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:11:06,872 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:11:06,873 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:11:06,873 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:11:06,873 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:11:06,873 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:11:06,873 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:11:06,874 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:11:06,874 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 23:11:07,293 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:11:07,321 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:11:07,325 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:11:07,327 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:11:07,328 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:11:07,329 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/nec20.c [2020-07-21 23:11:07,418 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f19ae92d3/ae62218be4654bca8dc44b768bacd315/FLAG80048eb7a [2020-07-21 23:11:08,086 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:11:08,087 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/nec20.c [2020-07-21 23:11:08,097 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f19ae92d3/ae62218be4654bca8dc44b768bacd315/FLAG80048eb7a [2020-07-21 23:11:08,463 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f19ae92d3/ae62218be4654bca8dc44b768bacd315 [2020-07-21 23:11:08,478 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:11:08,484 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:11:08,487 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:11:08,487 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:11:08,491 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:11:08,493 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74759e7d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08, skipping insertion in model container [2020-07-21 23:11:08,499 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,508 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:11:08,526 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:11:08,798 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:11:08,803 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:11:08,826 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:11:08,843 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:11:08,844 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08 WrapperNode [2020-07-21 23:11:08,844 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:11:08,844 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:11:08,844 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:11:08,845 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:11:08,963 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,965 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,971 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,972 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,983 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,989 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (1/1) ... [2020-07-21 23:11:08,992 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:11:08,993 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:11:08,993 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:11:08,994 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:11:09,001 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (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 23:11:09,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:11:09,067 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:11:09,067 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:11:09,067 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:11:09,067 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:11:09,068 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-21 23:11:09,068 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:11:09,068 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-07-21 23:11:09,068 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:11:09,068 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:11:09,069 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:11:09,327 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:11:09,328 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 23:11:09,332 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:09 BoogieIcfgContainer [2020-07-21 23:11:09,332 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:11:09,333 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:11:09,334 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:11:09,339 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:11:09,340 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:11:08" (1/3) ... [2020-07-21 23:11:09,341 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@283afe6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:09, skipping insertion in model container [2020-07-21 23:11:09,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:11:08" (2/3) ... [2020-07-21 23:11:09,342 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@283afe6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:11:09, skipping insertion in model container [2020-07-21 23:11:09,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:11:09" (3/3) ... [2020-07-21 23:11:09,345 INFO L109 eAbstractionObserver]: Analyzing ICFG nec20.c [2020-07-21 23:11:09,360 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:11:09,368 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:11:09,381 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:11:09,410 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:11:09,410 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:11:09,410 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:11:09,411 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:11:09,411 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:11:09,411 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:11:09,411 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:11:09,411 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:11:09,434 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-07-21 23:11:09,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 23:11:09,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:11:09,443 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:11:09,444 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:11:09,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:11:09,449 INFO L82 PathProgramCache]: Analyzing trace with hash -676339564, now seen corresponding path program 1 times [2020-07-21 23:11:09,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:11:09,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1128064418] [2020-07-21 23:11:09,461 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 [2020-07-21 23:11:09,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:11:09,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:11:09,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:11:09,545 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:11:09,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:11:09,612 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:11:09,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1128064418] [2020-07-21 23:11:09,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:11:09,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:11:09,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729383157] [2020-07-21 23:11:09,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:11:09,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:11:09,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:11:09,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:11:09,657 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-07-21 23:11:09,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:11:09,748 INFO L93 Difference]: Finished difference Result 43 states and 52 transitions. [2020-07-21 23:11:09,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:11:09,752 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2020-07-21 23:11:09,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:11:09,768 INFO L225 Difference]: With dead ends: 43 [2020-07-21 23:11:09,769 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 23:11:09,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 13 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 23:11:09,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 23:11:09,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 23:11:09,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 23:11:09,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-07-21 23:11:09,880 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2020-07-21 23:11:09,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:11:09,881 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-07-21 23:11:09,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:11:09,882 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-07-21 23:11:09,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 23:11:09,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:11:09,886 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:11:10,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:11:10,103 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:11:10,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:11:10,104 INFO L82 PathProgramCache]: Analyzing trace with hash 2087974871, now seen corresponding path program 1 times [2020-07-21 23:11:10,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:11:10,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808107775] [2020-07-21 23:11:10,106 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 [2020-07-21 23:11:10,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:11:10,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 23:11:10,164 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 23:11:10,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 23:11:10,180 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 23:11:10,202 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 23:11:10,202 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 23:11:10,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:11:10,440 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 11:11:10 BoogieIcfgContainer [2020-07-21 23:11:10,440 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 23:11:10,444 INFO L168 Benchmark]: Toolchain (without parser) took 1962.62 ms. Allocated memory was 137.9 MB in the beginning and 201.3 MB in the end (delta: 63.4 MB). Free memory was 102.1 MB in the beginning and 133.7 MB in the end (delta: -31.6 MB). Peak memory consumption was 31.9 MB. Max. memory is 7.1 GB. [2020-07-21 23:11:10,445 INFO L168 Benchmark]: CDTParser took 0.62 ms. Allocated memory is still 137.9 MB. Free memory is still 120.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 23:11:10,446 INFO L168 Benchmark]: CACSL2BoogieTranslator took 357.45 ms. Allocated memory is still 137.9 MB. Free memory was 101.7 MB in the beginning and 91.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 23:11:10,447 INFO L168 Benchmark]: Boogie Preprocessor took 148.18 ms. Allocated memory was 137.9 MB in the beginning and 201.3 MB in the end (delta: 63.4 MB). Free memory was 91.9 MB in the beginning and 179.8 MB in the end (delta: -87.9 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 23:11:10,448 INFO L168 Benchmark]: RCFGBuilder took 339.14 ms. Allocated memory is still 201.3 MB. Free memory was 178.8 MB in the beginning and 165.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-21 23:11:10,450 INFO L168 Benchmark]: TraceAbstraction took 1107.04 ms. Allocated memory is still 201.3 MB. Free memory was 165.2 MB in the beginning and 133.7 MB in the end (delta: 31.5 MB). Peak memory consumption was 31.5 MB. Max. memory is 7.1 GB. [2020-07-21 23:11:10,455 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.62 ms. Allocated memory is still 137.9 MB. Free memory is still 120.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 357.45 ms. Allocated memory is still 137.9 MB. Free memory was 101.7 MB in the beginning and 91.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 148.18 ms. Allocated memory was 137.9 MB in the beginning and 201.3 MB in the end (delta: 63.4 MB). Free memory was 91.9 MB in the beginning and 179.8 MB in the end (delta: -87.9 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 339.14 ms. Allocated memory is still 201.3 MB. Free memory was 178.8 MB in the beginning and 165.2 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1107.04 ms. Allocated memory is still 201.3 MB. Free memory was 165.2 MB in the beginning and 133.7 MB in the end (delta: 31.5 MB). Peak memory consumption was 31.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 6]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int b; VAL [\old(b)=2, b=0] [L13] _Bool k=__VERIFIER_nondet_bool(); [L14] unsigned int i,n,j; [L15] int a[1025]; VAL [b=0, k=1] [L17] COND TRUE \read(k) [L18] n=0 VAL [b=0, k=1, n=0] [L23] i=0 [L24] j=__VERIFIER_nondet_uint() [L25] COND FALSE !(j > 10000) VAL [b=0, i=0, j=-4294957296, k=1, n=0] [L28] COND TRUE i <= n [L29] i++ [L30] j= j +2 VAL [b=0, i=1, j=-4294957294, k=1, n=0] [L28] COND FALSE !(i <= n) VAL [b=0, i=1, j=-4294957294, k=1, n=0] [L33] a[i]=0 VAL [b=0, i=1, j=-4294957294, k=1, n=0] [L34] CALL __VERIFIER_assert(j<1025) VAL [\old(cond)=0, b=0] [L5] COND TRUE !(cond) VAL [\old(cond)=0, b=0, cond=0] [L6] __VERIFIER_error() VAL [\old(cond)=0, b=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 27 SDtfs, 2 SDslu, 21 SDs, 0 SdLazy, 5 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 14 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=25occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 31 NumberOfCodeBlocks, 28 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 14 ConstructedInterpolants, 0 QuantifiedInterpolants, 252 SizeOfPredicates, 2 NumberOfNonLiveVariables, 30 ConjunctsInSsa, 3 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...