/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/loop-acceleration/underapprox_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:44:04,877 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:44:04,880 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:44:04,896 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:44:04,897 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:44:04,899 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:44:04,902 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:44:04,913 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:44:04,916 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:44:04,917 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:44:04,918 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:44:04,921 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:44:04,921 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:44:04,923 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:44:04,924 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:44:04,928 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:44:04,931 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:44:04,934 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:44:04,936 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:44:04,943 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:44:04,948 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:44:04,949 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:44:04,951 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:44:04,952 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:44:04,956 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:44:04,964 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:44:04,965 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:44:04,966 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:44:04,967 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 01:44:04,992 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:44:04,993 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:44:04,997 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:44:04,998 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:44:04,998 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:44:04,998 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:44:04,999 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:44:04,999 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:44:04,999 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:44:04,999 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:44:04,999 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:44:05,000 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:44:05,000 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:44:05,000 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:44:05,000 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:44:05,001 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:44:05,001 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:44:05,001 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:44:05,003 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:44:05,003 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:44:05,003 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:44:05,003 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:44:05,004 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:44:05,004 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:44:05,005 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:44:05,005 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:44:05,005 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:05,005 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:44:05,005 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:44:05,006 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 01:44:05,380 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:44:05,398 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:44:05,402 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:44:05,403 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:44:05,403 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:44:05,404 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-07-21 01:44:05,480 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cda7771e2/43e5833dc1f44874966152243da6d42f/FLAGf9658de70 [2020-07-21 01:44:06,007 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:44:06,008 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_1-1.c [2020-07-21 01:44:06,021 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cda7771e2/43e5833dc1f44874966152243da6d42f/FLAGf9658de70 [2020-07-21 01:44:06,307 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cda7771e2/43e5833dc1f44874966152243da6d42f [2020-07-21 01:44:06,319 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:44:06,322 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:44:06,323 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:44:06,323 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:44:06,329 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:44:06,330 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,334 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@578436d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06, skipping insertion in model container [2020-07-21 01:44:06,335 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,345 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:44:06,366 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:44:06,544 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:44:06,550 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:44:06,565 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:44:06,579 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:44:06,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06 WrapperNode [2020-07-21 01:44:06,580 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:44:06,581 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:44:06,581 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:44:06,581 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:44:06,593 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,593 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,600 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,600 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,605 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,610 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,612 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (1/1) ... [2020-07-21 01:44:06,613 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:44:06,614 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:44:06,614 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:44:06,614 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:44:06,615 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (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 01:44:06,797 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:44:06,797 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:44:06,797 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:44:06,798 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:44:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:44:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:44:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:44:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:44:06,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:44:07,091 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:44:07,094 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:44:07,113 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:44:07 BoogieIcfgContainer [2020-07-21 01:44:07,113 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:44:07,116 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:44:07,116 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:44:07,122 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:44:07,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:44:06" (1/3) ... [2020-07-21 01:44:07,124 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20335ad5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:44:07, skipping insertion in model container [2020-07-21 01:44:07,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:44:06" (2/3) ... [2020-07-21 01:44:07,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20335ad5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:44:07, skipping insertion in model container [2020-07-21 01:44:07,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:44:07" (3/3) ... [2020-07-21 01:44:07,131 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-07-21 01:44:07,146 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:44:07,162 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:44:07,180 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:44:07,205 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:44:07,205 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:44:07,205 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:44:07,205 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:44:07,206 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:44:07,206 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:44:07,206 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:44:07,207 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:44:07,226 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 01:44:07,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 01:44:07,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:44:07,233 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:44:07,233 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:44:07,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:44:07,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-21 01:44:07,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:44:07,248 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612935499] [2020-07-21 01:44:07,249 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 01:44:07,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 01:44:07,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:44:07,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 15 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:44:07,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:44:07,413 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 01:44:07,415 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:44:07,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612935499] [2020-07-21 01:44:07,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:44:07,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:44:07,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740383727] [2020-07-21 01:44:07,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:44:07,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:44:07,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:44:07,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:44:07,471 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-21 01:44:07,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:44:07,556 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 01:44:07,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:44:07,560 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 01:44:07,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:44:07,581 INFO L225 Difference]: With dead ends: 29 [2020-07-21 01:44:07,582 INFO L226 Difference]: Without dead ends: 12 [2020-07-21 01:44:07,587 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 01:44:07,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-21 01:44:07,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-21 01:44:07,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-21 01:44:07,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-21 01:44:07,633 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-21 01:44:07,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:44:07,634 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-21 01:44:07,634 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:44:07,634 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-21 01:44:07,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 01:44:07,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:44:07,635 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:44:07,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:07,850 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:44:07,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:44:07,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-21 01:44:07,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:44:07,853 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112770754] [2020-07-21 01:44:07,853 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 01:44:07,897 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:44:07,897 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:44:07,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 01:44:07,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:44:07,935 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 01:44:07,935 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:44:07,987 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 01:44:07,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112770754] [2020-07-21 01:44:07,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:44:07,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 01:44:07,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076325306] [2020-07-21 01:44:07,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:44:07,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:44:07,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:44:07,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:44:07,994 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-21 01:44:08,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:44:08,103 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-21 01:44:08,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:44:08,104 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-21 01:44:08,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:44:08,106 INFO L225 Difference]: With dead ends: 20 [2020-07-21 01:44:08,106 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 01:44:08,107 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 01:44:08,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 01:44:08,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 01:44:08,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 01:44:08,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 01:44:08,113 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-21 01:44:08,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:44:08,114 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 01:44:08,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:44:08,114 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 01:44:08,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 01:44:08,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:44:08,115 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:44:08,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:08,317 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:44:08,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:44:08,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-21 01:44:08,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:44:08,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162727105] [2020-07-21 01:44:08,321 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:08,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:44:08,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:44:08,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 01:44:08,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:44:08,442 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 01:44:08,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:44:08,570 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 01:44:08,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162727105] [2020-07-21 01:44:08,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:44:08,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 01:44:08,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697380109] [2020-07-21 01:44:08,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 01:44:08,573 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:44:08,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 01:44:08,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2020-07-21 01:44:08,574 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-21 01:44:08,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:44:08,657 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-21 01:44:08,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:44:08,658 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-21 01:44:08,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:44:08,659 INFO L225 Difference]: With dead ends: 22 [2020-07-21 01:44:08,659 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 01:44:08,660 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 01:44:08,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 01:44:08,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 01:44:08,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 01:44:08,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 01:44:08,666 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-07-21 01:44:08,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:44:08,667 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 01:44:08,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 01:44:08,667 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 01:44:08,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 01:44:08,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:44:08,669 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:44:08,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:08,885 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:44:08,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:44:08,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 3 times [2020-07-21 01:44:08,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:44:08,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1471864045] [2020-07-21 01:44:08,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:08,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:44:08,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 01:44:08,928 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 01:44:08,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 01:44:08,940 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 01:44:08,959 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 01:44:08,960 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 01:44:09,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:44:09,199 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:44:09 BoogieIcfgContainer [2020-07-21 01:44:09,199 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:44:09,202 INFO L168 Benchmark]: Toolchain (without parser) took 2880.76 ms. Allocated memory was 144.2 MB in the beginning and 200.8 MB in the end (delta: 56.6 MB). Free memory was 102.4 MB in the beginning and 100.2 MB in the end (delta: 2.1 MB). Peak memory consumption was 58.8 MB. Max. memory is 7.1 GB. [2020-07-21 01:44:09,204 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 01:44:09,205 INFO L168 Benchmark]: CACSL2BoogieTranslator took 257.58 ms. Allocated memory is still 144.2 MB. Free memory was 102.0 MB in the beginning and 92.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 01:44:09,207 INFO L168 Benchmark]: Boogie Preprocessor took 32.07 ms. Allocated memory is still 144.2 MB. Free memory was 92.7 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 01:44:09,209 INFO L168 Benchmark]: RCFGBuilder took 499.85 ms. Allocated memory was 144.2 MB in the beginning and 200.8 MB in the end (delta: 56.6 MB). Free memory was 91.2 MB in the beginning and 168.6 MB in the end (delta: -77.3 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 01:44:09,213 INFO L168 Benchmark]: TraceAbstraction took 2083.31 ms. Allocated memory is still 200.8 MB. Free memory was 167.9 MB in the beginning and 100.2 MB in the end (delta: 67.6 MB). Peak memory consumption was 67.6 MB. Max. memory is 7.1 GB. [2020-07-21 01:44:09,221 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 144.2 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 257.58 ms. Allocated memory is still 144.2 MB. Free memory was 102.0 MB in the beginning and 92.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 32.07 ms. Allocated memory is still 144.2 MB. Free memory was 92.7 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 499.85 ms. Allocated memory was 144.2 MB in the beginning and 200.8 MB in the end (delta: 56.6 MB). Free memory was 91.2 MB in the beginning and 168.6 MB in the end (delta: -77.3 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2083.31 ms. Allocated memory is still 200.8 MB. Free memory was 167.9 MB in the beginning and 100.2 MB in the end (delta: 67.6 MB). Peak memory consumption was 67.6 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: 1.9s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.3s, 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, 0.1s 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, 0.3s InterpolantComputationTime, 51 NumberOfCodeBlocks, 43 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 55 ConstructedInterpolants, 0 QuantifiedInterpolants, 1271 SizeOfPredicates, 3 NumberOfNonLiveVariables, 82 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...