java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-112bae1 [2019-09-08 02:51:46,800 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-08 02:51:46,802 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-08 02:51:46,819 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-08 02:51:46,820 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-08 02:51:46,821 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-08 02:51:46,823 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-08 02:51:46,835 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-08 02:51:46,837 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-08 02:51:46,837 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-08 02:51:46,841 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-08 02:51:46,843 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-08 02:51:46,843 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-08 02:51:46,845 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-08 02:51:46,848 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-08 02:51:46,849 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-08 02:51:46,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-08 02:51:46,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-08 02:51:46,856 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-08 02:51:46,859 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-08 02:51:46,862 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-08 02:51:46,863 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-08 02:51:46,866 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-08 02:51:46,867 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-08 02:51:46,870 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-08 02:51:46,882 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-08 02:51:46,884 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-08 02:51:46,884 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-08 02:51:46,885 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 [2019-09-08 02:51:46,905 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-08 02:51:46,906 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-08 02:51:46,908 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-09-08 02:51:46,908 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-09-08 02:51:46,908 INFO L138 SettingsManager]: * Use SBE=true [2019-09-08 02:51:46,909 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-08 02:51:46,909 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-08 02:51:46,909 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-09-08 02:51:46,909 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-08 02:51:46,909 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-08 02:51:46,910 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-08 02:51:46,911 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-08 02:51:46,911 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-08 02:51:46,911 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-08 02:51:46,911 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-08 02:51:46,912 INFO L138 SettingsManager]: * Use constant arrays=true [2019-09-08 02:51:46,912 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-08 02:51:46,912 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-08 02:51:46,912 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-08 02:51:46,913 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-09-08 02:51:46,913 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-09-08 02:51:46,913 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-08 02:51:46,913 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-08 02:51:46,913 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-08 02:51:46,914 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-09-08 02:51:46,914 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-09-08 02:51:46,914 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-08 02:51:46,914 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-08 02:51:46,914 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-09-08 02:51:46,967 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-08 02:51:46,984 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-08 02:51:46,988 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-08 02:51:46,990 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-08 02:51:46,990 INFO L275 PluginConnector]: CDTParser initialized [2019-09-08 02:51:46,991 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2019-09-08 02:51:47,048 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d720ed6e/17d4987536f04111b6038c2b31d69841/FLAG7cf7380a0 [2019-09-08 02:51:47,465 INFO L306 CDTParser]: Found 1 translation units. [2019-09-08 02:51:47,465 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/underapprox_2-1.c [2019-09-08 02:51:47,471 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d720ed6e/17d4987536f04111b6038c2b31d69841/FLAG7cf7380a0 [2019-09-08 02:51:47,907 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3d720ed6e/17d4987536f04111b6038c2b31d69841 [2019-09-08 02:51:47,918 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-08 02:51:47,920 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-08 02:51:47,921 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-08 02:51:47,921 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-08 02:51:47,924 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-08 02:51:47,925 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.09 02:51:47" (1/1) ... [2019-09-08 02:51:47,928 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@181c038 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:47, skipping insertion in model container [2019-09-08 02:51:47,928 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 08.09 02:51:47" (1/1) ... [2019-09-08 02:51:47,935 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-08 02:51:47,952 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-08 02:51:48,146 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-08 02:51:48,160 INFO L188 MainTranslator]: Completed pre-run [2019-09-08 02:51:48,183 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-08 02:51:48,206 INFO L192 MainTranslator]: Completed translation [2019-09-08 02:51:48,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48 WrapperNode [2019-09-08 02:51:48,208 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-08 02:51:48,208 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-08 02:51:48,208 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-08 02:51:48,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-08 02:51:48,319 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,319 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,325 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,327 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,331 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,336 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,337 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (1/1) ... [2019-09-08 02:51:48,338 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-08 02:51:48,339 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-08 02:51:48,339 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-08 02:51:48,339 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-08 02:51:48,340 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (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 [2019-09-08 02:51:48,401 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-08 02:51:48,402 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-08 02:51:48,402 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-08 02:51:48,402 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-08 02:51:48,402 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-08 02:51:48,402 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-08 02:51:48,402 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-08 02:51:48,402 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-08 02:51:48,403 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-08 02:51:48,578 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-08 02:51:48,579 INFO L283 CfgBuilder]: Removed 1 assume(true) statements. [2019-09-08 02:51:48,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.09 02:51:48 BoogieIcfgContainer [2019-09-08 02:51:48,580 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-08 02:51:48,581 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-08 02:51:48,581 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-08 02:51:48,584 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-08 02:51:48,584 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 08.09 02:51:47" (1/3) ... [2019-09-08 02:51:48,585 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ee6f1ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.09 02:51:48, skipping insertion in model container [2019-09-08 02:51:48,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 08.09 02:51:48" (2/3) ... [2019-09-08 02:51:48,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4ee6f1ad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 08.09 02:51:48, skipping insertion in model container [2019-09-08 02:51:48,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 08.09 02:51:48" (3/3) ... [2019-09-08 02:51:48,587 INFO L109 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2019-09-08 02:51:48,597 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-08 02:51:48,604 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-08 02:51:48,619 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-08 02:51:48,650 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2019-09-08 02:51:48,651 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-08 02:51:48,651 INFO L378 AbstractCegarLoop]: Hoare is true [2019-09-08 02:51:48,651 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-08 02:51:48,652 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-08 02:51:48,652 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-08 02:51:48,653 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-08 02:51:48,653 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-08 02:51:48,653 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-08 02:51:48,673 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-09-08 02:51:48,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-08 02:51:48,679 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:48,680 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:48,682 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:48,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:48,686 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2019-09-08 02:51:48,687 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:48,688 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:48,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:48,724 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-08 02:51:48,724 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:48,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:48,919 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:48,921 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-08 02:51:48,922 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-09-08 02:51:48,926 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-08 02:51:48,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-08 02:51:48,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-08 02:51:48,942 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2019-09-08 02:51:49,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-08 02:51:49,043 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2019-09-08 02:51:49,043 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-08 02:51:49,045 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-09-08 02:51:49,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-08 02:51:49,058 INFO L225 Difference]: With dead ends: 29 [2019-09-08 02:51:49,059 INFO L226 Difference]: Without dead ends: 12 [2019-09-08 02:51:49,062 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-08 02:51:49,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-09-08 02:51:49,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-09-08 02:51:49,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-09-08 02:51:49,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-09-08 02:51:49,110 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-09-08 02:51:49,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-08 02:51:49,111 INFO L475 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-09-08 02:51:49,111 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-08 02:51:49,111 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-09-08 02:51:49,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-08 02:51:49,112 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:49,112 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:49,116 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:49,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:49,116 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2019-09-08 02:51:49,116 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:49,116 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:49,117 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,118 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-08 02:51:49,118 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:49,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:49,235 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-08 02:51:49,235 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-08 02:51:49,251 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-08 02:51:49,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:49,267 INFO L256 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-08 02:51:49,272 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-08 02:51:49,317 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:49,322 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-08 02:51:49,322 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4] total 7 [2019-09-08 02:51:49,323 INFO L454 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-09-08 02:51:49,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-09-08 02:51:49,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-09-08 02:51:49,325 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 7 states. [2019-09-08 02:51:49,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-08 02:51:49,366 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2019-09-08 02:51:49,367 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-09-08 02:51:49,367 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2019-09-08 02:51:49,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-08 02:51:49,368 INFO L225 Difference]: With dead ends: 18 [2019-09-08 02:51:49,368 INFO L226 Difference]: Without dead ends: 13 [2019-09-08 02:51:49,369 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 3 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-09-08 02:51:49,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-09-08 02:51:49,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-09-08 02:51:49,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-09-08 02:51:49,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2019-09-08 02:51:49,374 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2019-09-08 02:51:49,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-08 02:51:49,374 INFO L475 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2019-09-08 02:51:49,375 INFO L476 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-09-08 02:51:49,375 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2019-09-08 02:51:49,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-08 02:51:49,375 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:49,376 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:49,376 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:49,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:49,376 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2019-09-08 02:51:49,377 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:49,377 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:49,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,378 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-08 02:51:49,378 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:49,515 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:49,515 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-08 02:51:49,515 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-08 02:51:49,538 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2019-09-08 02:51:49,553 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-09-08 02:51:49,553 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-08 02:51:49,554 INFO L256 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-08 02:51:49,555 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-08 02:51:49,583 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:49,586 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-08 02:51:49,586 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5] total 8 [2019-09-08 02:51:49,587 INFO L454 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-09-08 02:51:49,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-09-08 02:51:49,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-09-08 02:51:49,588 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 8 states. [2019-09-08 02:51:49,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-08 02:51:49,619 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2019-09-08 02:51:49,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-08 02:51:49,620 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 12 [2019-09-08 02:51:49,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-08 02:51:49,621 INFO L225 Difference]: With dead ends: 19 [2019-09-08 02:51:49,621 INFO L226 Difference]: Without dead ends: 14 [2019-09-08 02:51:49,622 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-09-08 02:51:49,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-09-08 02:51:49,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-09-08 02:51:49,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-09-08 02:51:49,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2019-09-08 02:51:49,626 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2019-09-08 02:51:49,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-08 02:51:49,627 INFO L475 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2019-09-08 02:51:49,627 INFO L476 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-09-08 02:51:49,627 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2019-09-08 02:51:49,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-09-08 02:51:49,628 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:49,628 INFO L399 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:49,628 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:49,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:49,629 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2019-09-08 02:51:49,629 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:49,629 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:49,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,630 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-08 02:51:49,630 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:49,785 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:49,786 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-08 02:51:49,786 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-08 02:51:49,802 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-08 02:51:49,817 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-09-08 02:51:49,817 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-08 02:51:49,818 INFO L256 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-08 02:51:49,820 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-08 02:51:49,845 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:49,849 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-08 02:51:49,849 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 9 [2019-09-08 02:51:49,849 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-08 02:51:49,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-08 02:51:49,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-08 02:51:49,850 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 9 states. [2019-09-08 02:51:49,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-08 02:51:49,898 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2019-09-08 02:51:49,899 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-08 02:51:49,899 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 13 [2019-09-08 02:51:49,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-08 02:51:49,900 INFO L225 Difference]: With dead ends: 20 [2019-09-08 02:51:49,900 INFO L226 Difference]: Without dead ends: 15 [2019-09-08 02:51:49,900 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-08 02:51:49,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-09-08 02:51:49,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-09-08 02:51:49,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-09-08 02:51:49,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-09-08 02:51:49,904 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2019-09-08 02:51:49,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-08 02:51:49,905 INFO L475 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-09-08 02:51:49,905 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-08 02:51:49,905 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-09-08 02:51:49,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-09-08 02:51:49,906 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:49,906 INFO L399 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:49,906 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:49,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:49,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2019-09-08 02:51:49,906 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:49,907 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:49,907 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-08 02:51:49,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:49,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:50,063 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:50,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-08 02:51:50,064 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-08 02:51:50,082 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-08 02:51:50,093 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-08 02:51:50,093 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-08 02:51:50,094 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 17 conjunts are in the unsatisfiable core [2019-09-08 02:51:50,095 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-08 02:51:50,115 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:50,118 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-08 02:51:50,118 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2019-09-08 02:51:50,119 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-08 02:51:50,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-08 02:51:50,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-09-08 02:51:50,120 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 10 states. [2019-09-08 02:51:50,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-08 02:51:50,185 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2019-09-08 02:51:50,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-08 02:51:50,186 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2019-09-08 02:51:50,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-08 02:51:50,187 INFO L225 Difference]: With dead ends: 21 [2019-09-08 02:51:50,187 INFO L226 Difference]: Without dead ends: 16 [2019-09-08 02:51:50,187 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2019-09-08 02:51:50,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-09-08 02:51:50,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-09-08 02:51:50,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-09-08 02:51:50,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2019-09-08 02:51:50,191 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2019-09-08 02:51:50,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-08 02:51:50,192 INFO L475 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2019-09-08 02:51:50,192 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-08 02:51:50,192 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2019-09-08 02:51:50,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-09-08 02:51:50,193 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:50,193 INFO L399 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:50,193 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:50,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:50,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2019-09-08 02:51:50,194 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:50,194 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:50,194 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:50,195 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-08 02:51:50,195 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:50,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-08 02:51:50,336 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:50,337 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-08 02:51:50,337 INFO L223 ckRefinementStrategy]: Switched to mode Z3_FP No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-08 02:51:50,358 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-08 02:51:50,376 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-09-08 02:51:50,377 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-08 02:51:50,378 INFO L256 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-08 02:51:50,379 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-08 02:51:50,402 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-08 02:51:50,406 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-08 02:51:50,406 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 11 [2019-09-08 02:51:50,407 INFO L454 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-09-08 02:51:50,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-09-08 02:51:50,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2019-09-08 02:51:50,408 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 11 states. [2019-09-08 02:51:50,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-08 02:51:50,479 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2019-09-08 02:51:50,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-08 02:51:50,480 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 15 [2019-09-08 02:51:50,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-08 02:51:50,481 INFO L225 Difference]: With dead ends: 22 [2019-09-08 02:51:50,481 INFO L226 Difference]: Without dead ends: 17 [2019-09-08 02:51:50,481 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2019-09-08 02:51:50,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-09-08 02:51:50,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-09-08 02:51:50,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-09-08 02:51:50,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2019-09-08 02:51:50,485 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2019-09-08 02:51:50,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-08 02:51:50,486 INFO L475 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2019-09-08 02:51:50,486 INFO L476 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-09-08 02:51:50,486 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2019-09-08 02:51:50,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-09-08 02:51:50,487 INFO L391 BasicCegarLoop]: Found error trace [2019-09-08 02:51:50,487 INFO L399 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-08 02:51:50,487 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-08 02:51:50,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-08 02:51:50,487 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2019-09-08 02:51:50,488 INFO L223 ckRefinementStrategy]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2019-09-08 02:51:50,488 INFO L69 tionRefinementEngine]: Using refinement strategy CamelRefinementStrategy [2019-09-08 02:51:50,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:50,489 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-08 02:51:50,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-08 02:51:50,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-08 02:51:50,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-09-08 02:51:50,533 INFO L466 BasicCegarLoop]: Counterexample might be feasible [2019-09-08 02:51:50,563 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 08.09 02:51:50 BoogieIcfgContainer [2019-09-08 02:51:50,564 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-09-08 02:51:50,570 INFO L168 Benchmark]: Toolchain (without parser) took 2645.84 ms. Allocated memory was 135.8 MB in the beginning and 232.3 MB in the end (delta: 96.5 MB). Free memory was 92.0 MB in the beginning and 135.6 MB in the end (delta: -43.6 MB). Peak memory consumption was 52.9 MB. Max. memory is 7.1 GB. [2019-09-08 02:51:50,571 INFO L168 Benchmark]: CDTParser took 0.42 ms. Allocated memory is still 135.8 MB. Free memory is still 109.9 MB. There was no memory consumed. Max. memory is 7.1 GB. [2019-09-08 02:51:50,572 INFO L168 Benchmark]: CACSL2BoogieTranslator took 287.30 ms. Allocated memory is still 135.8 MB. Free memory was 91.6 MB in the beginning and 82.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. [2019-09-08 02:51:50,574 INFO L168 Benchmark]: Boogie Preprocessor took 129.91 ms. Allocated memory was 135.8 MB in the beginning and 202.4 MB in the end (delta: 66.6 MB). Free memory was 82.5 MB in the beginning and 178.8 MB in the end (delta: -96.2 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. [2019-09-08 02:51:50,575 INFO L168 Benchmark]: RCFGBuilder took 241.61 ms. Allocated memory is still 202.4 MB. Free memory was 178.8 MB in the beginning and 168.2 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2019-09-08 02:51:50,577 INFO L168 Benchmark]: TraceAbstraction took 1982.93 ms. Allocated memory was 202.4 MB in the beginning and 232.3 MB in the end (delta: 29.9 MB). Free memory was 168.2 MB in the beginning and 135.6 MB in the end (delta: 32.7 MB). Peak memory consumption was 62.5 MB. Max. memory is 7.1 GB. [2019-09-08 02:51:50,587 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.42 ms. Allocated memory is still 135.8 MB. Free memory is still 109.9 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 287.30 ms. Allocated memory is still 135.8 MB. Free memory was 91.6 MB in the beginning and 82.5 MB in the end (delta: 9.0 MB). Peak memory consumption was 9.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 129.91 ms. Allocated memory was 135.8 MB in the beginning and 202.4 MB in the end (delta: 66.6 MB). Free memory was 82.5 MB in the beginning and 178.8 MB in the end (delta: -96.2 MB). Peak memory consumption was 15.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 241.61 ms. Allocated memory is still 202.4 MB. Free memory was 178.8 MB in the beginning and 168.2 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1982.93 ms. Allocated memory was 202.4 MB in the beginning and 232.3 MB in the end (delta: 29.9 MB). Free memory was 168.2 MB in the beginning and 135.6 MB in the end (delta: 32.7 MB). Peak memory consumption was 62.5 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(x != 6) 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. UNSAFE Result, 1.9s OverallTime, 7 OverallIterations, 6 TraceHistogramMax, 0.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 66 SDtfs, 1 SDslu, 256 SDs, 0 SdLazy, 193 SolverSat, 16 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 111 GetRequests, 57 SyntacticMatches, 16 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.6s 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 AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 156 NumberOfCodeBlocks, 156 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 129 ConstructedInterpolants, 0 QuantifiedInterpolants, 5249 SizeOfPredicates, 0 NumberOfNonLiveVariables, 195 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/70 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...