/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:45:11,842 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:45:11,844 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:45:11,856 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:45:11,856 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:45:11,857 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:45:11,859 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:45:11,860 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:45:11,862 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:45:11,863 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:45:11,864 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:45:11,865 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:45:11,865 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:45:11,866 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:45:11,867 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:45:11,868 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:45:11,869 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:45:11,870 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:45:11,872 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:45:11,874 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:45:11,875 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:45:11,876 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:45:11,877 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:45:11,878 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:45:11,881 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:45:11,888 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:45:11,889 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:45:11,890 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:45:11,891 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:45:11,905 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:45:11,905 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:45:11,906 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:45:11,906 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:45:11,907 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:45:11,907 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:45:11,907 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:45:11,907 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:45:11,907 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:45:11,908 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:45:11,908 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:45:11,908 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:45:11,908 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:45:11,908 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:45:11,909 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:45:11,909 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:45:11,909 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:45:11,909 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:45:11,909 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:45:11,910 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:45:11,910 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:45:11,910 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:45:11,910 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:45:11,910 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:45:11,911 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:45:11,911 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:45:11,911 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:11,911 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:45:11,913 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:45:11,913 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:45:12,177 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:45:12,197 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:45:12,201 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:45:12,203 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:45:12,205 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:45:12,205 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-07-21 16:45:12,274 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2adebe60e/c2ce561af2bd469bad3890c3f5f8d749/FLAG7b084ae76 [2020-07-21 16:45:12,721 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:45:12,721 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-07-21 16:45:12,728 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2adebe60e/c2ce561af2bd469bad3890c3f5f8d749/FLAG7b084ae76 [2020-07-21 16:45:13,081 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2adebe60e/c2ce561af2bd469bad3890c3f5f8d749 [2020-07-21 16:45:13,089 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:45:13,092 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:45:13,092 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:45:13,093 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:45:13,097 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:45:13,098 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,100 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@603688d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13, skipping insertion in model container [2020-07-21 16:45:13,101 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,110 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:45:13,127 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:45:13,273 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:45:13,277 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:45:13,292 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:45:13,309 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:45:13,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13 WrapperNode [2020-07-21 16:45:13,310 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:45:13,311 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:45:13,311 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:45:13,311 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:45:13,324 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,324 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,329 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,329 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,332 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,337 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,337 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... [2020-07-21 16:45:13,420 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:45:13,420 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:45:13,421 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:45:13,421 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:45:13,425 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:45:13,490 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:45:13,490 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:45:13,490 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:45:13,490 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:45:13,490 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:45:13,491 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:45:13,491 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:45:13,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:45:13,491 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:45:13,649 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:45:13,650 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 16:45:13,653 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:45:13 BoogieIcfgContainer [2020-07-21 16:45:13,653 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:45:13,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:45:13,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:45:13,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:45:13,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:45:13" (1/3) ... [2020-07-21 16:45:13,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@638177ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:45:13, skipping insertion in model container [2020-07-21 16:45:13,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:45:13" (2/3) ... [2020-07-21 16:45:13,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@638177ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:45:13, skipping insertion in model container [2020-07-21 16:45:13,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:45:13" (3/3) ... [2020-07-21 16:45:13,661 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-07-21 16:45:13,671 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:45:13,678 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:45:13,692 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:45:13,713 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:45:13,713 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:45:13,714 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:45:13,714 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:45:13,714 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:45:13,714 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:45:13,714 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:45:13,714 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:45:13,729 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 16:45:13,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 16:45:13,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:45:13,734 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:45:13,734 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:45:13,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:45:13,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-21 16:45:13,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:45:13,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441000494] [2020-07-21 16:45:13,746 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:13,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:45:13,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:45:13,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 16:45:13,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:45:13,866 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:45:13,867 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:45:13,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441000494] [2020-07-21 16:45:13,869 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:45:13,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 16:45:13,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628567902] [2020-07-21 16:45:13,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 16:45:13,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:45:13,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 16:45:13,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 16:45:13,894 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-21 16:45:13,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:45:13,930 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 16:45:13,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 16:45:13,932 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 16:45:13,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:45:13,940 INFO L225 Difference]: With dead ends: 29 [2020-07-21 16:45:13,940 INFO L226 Difference]: Without dead ends: 12 [2020-07-21 16:45:13,944 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 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 16:45:13,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-21 16:45:13,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-21 16:45:13,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-21 16:45:13,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-21 16:45:13,993 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-21 16:45:13,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:45:13,993 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-21 16:45:13,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 16:45:13,994 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-21 16:45:13,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 16:45:13,994 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:45:13,994 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:45:14,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:14,209 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:45:14,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:45:14,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-21 16:45:14,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:45:14,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2141373404] [2020-07-21 16:45:14,211 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:14,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:45:14,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:45:14,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 16:45:14,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:45:14,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:45:14,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:45:14,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:45:14,318 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2141373404] [2020-07-21 16:45:14,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:45:14,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 16:45:14,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898865255] [2020-07-21 16:45:14,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 16:45:14,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:45:14,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 16:45:14,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:45:14,322 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-21 16:45:14,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:45:14,399 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-21 16:45:14,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:45:14,400 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-21 16:45:14,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:45:14,402 INFO L225 Difference]: With dead ends: 20 [2020-07-21 16:45:14,402 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 16:45:14,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:45:14,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 16:45:14,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 16:45:14,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 16:45:14,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 16:45:14,408 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-21 16:45:14,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:45:14,409 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 16:45:14,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 16:45:14,409 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 16:45:14,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:45:14,410 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:45:14,410 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:45:14,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:14,626 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:45:14,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:45:14,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-21 16:45:14,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:45:14,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556590689] [2020-07-21 16:45:14,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:14,662 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:45:14,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:45:14,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:45:14,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:45:14,716 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:45:14,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:45:14,808 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:45:14,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556590689] [2020-07-21 16:45:14,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:45:14,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 16:45:14,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822235663] [2020-07-21 16:45:14,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:45:14,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:45:14,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:45:14,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:45:14,812 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-21 16:45:14,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:45:14,865 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-21 16:45:14,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:45:14,866 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-21 16:45:14,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:45:14,867 INFO L225 Difference]: With dead ends: 22 [2020-07-21 16:45:14,867 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 16:45:14,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:45:14,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 16:45:14,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 16:45:14,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 16:45:14,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 16:45:14,873 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-07-21 16:45:14,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:45:14,874 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 16:45:14,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:45:14,874 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 16:45:14,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 16:45:14,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:45:14,875 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:45:15,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:15,076 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:45:15,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:45:15,077 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 3 times [2020-07-21 16:45:15,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:45:15,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380323375] [2020-07-21 16:45:15,078 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 16:45:15,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:45:15,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 16:45:15,113 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:45:15,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 16:45:15,123 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 16:45:15,138 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 16:45:15,139 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 16:45:15,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:45:15,373 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:45:15 BoogieIcfgContainer [2020-07-21 16:45:15,374 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:45:15,376 INFO L168 Benchmark]: Toolchain (without parser) took 2284.98 ms. Allocated memory was 138.4 MB in the beginning and 202.9 MB in the end (delta: 64.5 MB). Free memory was 103.5 MB in the beginning and 102.9 MB in the end (delta: 649.1 kB). Peak memory consumption was 65.1 MB. Max. memory is 7.1 GB. [2020-07-21 16:45:15,377 INFO L168 Benchmark]: CDTParser took 0.44 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 16:45:15,378 INFO L168 Benchmark]: CACSL2BoogieTranslator took 217.84 ms. Allocated memory is still 138.4 MB. Free memory was 103.3 MB in the beginning and 94.0 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:45:15,379 INFO L168 Benchmark]: Boogie Preprocessor took 109.48 ms. Allocated memory was 138.4 MB in the beginning and 202.9 MB in the end (delta: 64.5 MB). Free memory was 94.0 MB in the beginning and 182.1 MB in the end (delta: -88.2 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:45:15,380 INFO L168 Benchmark]: RCFGBuilder took 232.76 ms. Allocated memory is still 202.9 MB. Free memory was 182.1 MB in the beginning and 171.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:45:15,381 INFO L168 Benchmark]: TraceAbstraction took 1719.46 ms. Allocated memory is still 202.9 MB. Free memory was 170.7 MB in the beginning and 102.9 MB in the end (delta: 67.8 MB). Peak memory consumption was 67.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:45:15,385 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.44 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.2 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 217.84 ms. Allocated memory is still 138.4 MB. Free memory was 103.3 MB in the beginning and 94.0 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 109.48 ms. Allocated memory was 138.4 MB in the beginning and 202.9 MB in the end (delta: 64.5 MB). Free memory was 94.0 MB in the beginning and 182.1 MB in the end (delta: -88.2 MB). Peak memory consumption was 14.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 232.76 ms. Allocated memory is still 202.9 MB. Free memory was 182.1 MB in the beginning and 171.4 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1719.46 ms. Allocated memory is still 202.9 MB. Free memory was 170.7 MB in the beginning and 102.9 MB in the end (delta: 67.8 MB). Peak memory consumption was 67.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L11] unsigned int x = 0; [L12] unsigned int y = 1; VAL [x=0, y=1] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=1, y=2] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=2, y=4] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=3, y=8] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=4, y=16] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=5, y=32] [L14] COND TRUE x < 6 [L15] x++ [L16] y *= 2 VAL [x=6, y=64] [L14] COND FALSE !(x < 6) VAL [x=6, y=64] [L19] CALL __VERIFIER_assert(y != 64) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.6s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 0 SDslu, 94 SDs, 0 SdLazy, 57 SolverSat, 8 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 58 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 51 NumberOfCodeBlocks, 51 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 55 ConstructedInterpolants, 0 QuantifiedInterpolants, 1271 SizeOfPredicates, 3 NumberOfNonLiveVariables, 97 ConjunctsInSsa, 19 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 0/22 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...