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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 02:56:20,385 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 02:56:20,387 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 02:56:20,406 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 02:56:20,406 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 02:56:20,408 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 02:56:20,409 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 02:56:20,411 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 02:56:20,413 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 02:56:20,414 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 02:56:20,415 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 02:56:20,416 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 02:56:20,416 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 02:56:20,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 02:56:20,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 02:56:20,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 02:56:20,420 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 02:56:20,421 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 02:56:20,425 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 02:56:20,430 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 02:56:20,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 02:56:20,435 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 02:56:20,438 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 02:56:20,439 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 02:56:20,442 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 02:56:20,457 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 02:56:20,457 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 02:56:20,461 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 02:56:20,462 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 [2019-10-15 02:56:20,483 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 02:56:20,483 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 02:56:20,485 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 02:56:20,486 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 02:56:20,486 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 02:56:20,486 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 02:56:20,486 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 02:56:20,486 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 02:56:20,487 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 02:56:20,487 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 02:56:20,488 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 02:56:20,488 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 02:56:20,488 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 02:56:20,489 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 02:56:20,489 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 02:56:20,489 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 02:56:20,489 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 02:56:20,490 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 02:56:20,490 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 02:56:20,490 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 02:56:20,490 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 02:56:20,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 02:56:20,490 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 02:56:20,491 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 02:56:20,491 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 02:56:20,491 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 02:56:20,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 02:56:20,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 02:56:20,492 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 02:56:20,769 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 02:56:20,782 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 02:56:20,786 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 02:56:20,788 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 02:56:20,788 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 02:56:20,789 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2019-10-15 02:56:20,852 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1a13e888b/3c0a8bb216494a18a127a3e580e818da/FLAG7ccaa6a07 [2019-10-15 02:56:21,320 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 02:56:21,321 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/ldv-regression/test25-2.c [2019-10-15 02:56:21,327 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1a13e888b/3c0a8bb216494a18a127a3e580e818da/FLAG7ccaa6a07 [2019-10-15 02:56:21,707 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1a13e888b/3c0a8bb216494a18a127a3e580e818da [2019-10-15 02:56:21,718 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 02:56:21,719 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 02:56:21,720 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 02:56:21,721 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 02:56:21,724 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 02:56:21,725 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 02:56:21" (1/1) ... [2019-10-15 02:56:21,728 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6912290 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:21, skipping insertion in model container [2019-10-15 02:56:21,729 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 02:56:21" (1/1) ... [2019-10-15 02:56:21,736 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 02:56:21,757 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 02:56:21,973 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 02:56:21,983 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 02:56:22,002 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 02:56:22,114 INFO L192 MainTranslator]: Completed translation [2019-10-15 02:56:22,114 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22 WrapperNode [2019-10-15 02:56:22,114 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 02:56:22,118 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 02:56:22,118 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 02:56:22,118 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 02:56:22,132 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,133 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,151 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,151 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,163 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,168 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,170 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (1/1) ... [2019-10-15 02:56:22,172 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 02:56:22,173 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 02:56:22,173 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 02:56:22,173 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 02:56:22,174 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (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 [2019-10-15 02:56:22,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 02:56:22,238 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 02:56:22,239 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2019-10-15 02:56:22,239 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 02:56:22,239 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 02:56:22,239 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 02:56:22,239 INFO L130 BoogieDeclarations]: Found specification of procedure check [2019-10-15 02:56:22,239 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2019-10-15 02:56:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 02:56:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 02:56:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 02:56:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 02:56:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2019-10-15 02:56:22,240 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 02:56:22,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 02:56:22,241 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 02:56:22,629 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 02:56:22,629 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 02:56:22,630 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 02:56:22 BoogieIcfgContainer [2019-10-15 02:56:22,631 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 02:56:22,632 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 02:56:22,632 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 02:56:22,635 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 02:56:22,635 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 02:56:21" (1/3) ... [2019-10-15 02:56:22,636 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@427c7109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 02:56:22, skipping insertion in model container [2019-10-15 02:56:22,636 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 02:56:22" (2/3) ... [2019-10-15 02:56:22,637 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@427c7109 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 02:56:22, skipping insertion in model container [2019-10-15 02:56:22,637 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 02:56:22" (3/3) ... [2019-10-15 02:56:22,639 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2019-10-15 02:56:22,647 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 02:56:22,654 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 02:56:22,666 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 02:56:22,687 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 02:56:22,687 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 02:56:22,688 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 02:56:22,688 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 02:56:22,688 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 02:56:22,688 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 02:56:22,688 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 02:56:22,688 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 02:56:22,704 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 02:56:22,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 02:56:22,710 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:56:22,711 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:56:22,713 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:56:22,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:56:22,718 INFO L82 PathProgramCache]: Analyzing trace with hash -794034576, now seen corresponding path program 1 times [2019-10-15 02:56:22,726 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:56:22,726 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851469975] [2019-10-15 02:56:22,727 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:22,727 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:22,727 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:56:22,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:22,882 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:56:22,883 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851469975] [2019-10-15 02:56:22,884 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 02:56:22,884 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 02:56:22,885 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53572550] [2019-10-15 02:56:22,889 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 02:56:22,890 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:56:22,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 02:56:22,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 02:56:22,908 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2019-10-15 02:56:22,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:56:22,930 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2019-10-15 02:56:22,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 02:56:22,932 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2019-10-15 02:56:22,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:56:22,943 INFO L225 Difference]: With dead ends: 34 [2019-10-15 02:56:22,943 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 02:56:22,947 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 02:56:22,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 02:56:22,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-15 02:56:22,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 02:56:22,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-15 02:56:22,991 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2019-10-15 02:56:22,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:56:22,992 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-15 02:56:22,992 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 02:56:22,992 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-15 02:56:22,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 02:56:22,994 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:56:22,994 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:56:22,994 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:56:22,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:56:22,995 INFO L82 PathProgramCache]: Analyzing trace with hash 1816505761, now seen corresponding path program 1 times [2019-10-15 02:56:22,996 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:56:22,996 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813655108] [2019-10-15 02:56:22,996 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:22,997 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:22,997 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:56:23,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:23,085 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:56:23,090 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813655108] [2019-10-15 02:56:23,091 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 02:56:23,091 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 02:56:23,092 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328207615] [2019-10-15 02:56:23,094 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 02:56:23,094 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:56:23,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 02:56:23,095 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 02:56:23,095 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 3 states. [2019-10-15 02:56:23,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:56:23,123 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2019-10-15 02:56:23,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 02:56:23,124 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-15 02:56:23,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:56:23,125 INFO L225 Difference]: With dead ends: 29 [2019-10-15 02:56:23,125 INFO L226 Difference]: Without dead ends: 18 [2019-10-15 02:56:23,126 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 02:56:23,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-15 02:56:23,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-15 02:56:23,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 02:56:23,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-15 02:56:23,137 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2019-10-15 02:56:23,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:56:23,138 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-15 02:56:23,139 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 02:56:23,139 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-15 02:56:23,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 02:56:23,142 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:56:23,142 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:56:23,143 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:56:23,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:56:23,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1169547320, now seen corresponding path program 1 times [2019-10-15 02:56:23,145 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:56:23,147 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734185885] [2019-10-15 02:56:23,147 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:23,147 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:23,148 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:56:23,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:23,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:56:23,319 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734185885] [2019-10-15 02:56:23,321 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1617509297] [2019-10-15 02:56:23,322 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:23,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:23,413 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 02:56:23,424 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 02:56:23,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:56:23,464 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 02:56:23,507 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 02:56:23,508 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [231278137] [2019-10-15 02:56:23,534 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 02:56:23,534 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 02:56:23,541 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 02:56:23,549 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 02:56:23,550 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 02:56:23,752 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 02:56:24,447 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 02:56:24,457 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 02:56:24,881 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 3 imperfect interpolant sequences. [2019-10-15 02:56:24,882 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [4, 4, 4] total 15 [2019-10-15 02:56:24,882 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958206772] [2019-10-15 02:56:24,883 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-15 02:56:24,884 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:56:24,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-15 02:56:24,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2019-10-15 02:56:24,886 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 10 states. [2019-10-15 02:56:25,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:56:25,348 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2019-10-15 02:56:25,348 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-15 02:56:25,348 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2019-10-15 02:56:25,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:56:25,349 INFO L225 Difference]: With dead ends: 27 [2019-10-15 02:56:25,350 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 02:56:25,351 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 40 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2019-10-15 02:56:25,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 02:56:25,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 02:56:25,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 02:56:25,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-10-15 02:56:25,361 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2019-10-15 02:56:25,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:56:25,361 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-10-15 02:56:25,361 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-15 02:56:25,361 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-10-15 02:56:25,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-15 02:56:25,363 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:56:25,363 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:56:25,568 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:25,569 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:56:25,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:56:25,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1944522461, now seen corresponding path program 1 times [2019-10-15 02:56:25,571 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:56:25,571 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219481945] [2019-10-15 02:56:25,572 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:25,572 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:25,572 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:56:25,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:25,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 02:56:25,644 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219481945] [2019-10-15 02:56:25,644 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202910892] [2019-10-15 02:56:25,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:25,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:25,721 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 02:56:25,725 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 02:56:25,737 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 02:56:25,738 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 02:56:25,768 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 02:56:25,769 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [81769597] [2019-10-15 02:56:25,771 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 02:56:25,771 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 02:56:25,772 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 02:56:25,772 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 02:56:25,772 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 02:56:25,825 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 02:56:26,362 INFO L199 IcfgInterpreter]: Interpreting procedure check with input of size 1 for LOIs [2019-10-15 02:56:26,370 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 02:56:26,377 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 02:56:26,765 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 02:56:26,765 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 10] total 16 [2019-10-15 02:56:26,766 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421174581] [2019-10-15 02:56:26,767 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-15 02:56:26,768 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:56:26,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-15 02:56:26,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2019-10-15 02:56:26,769 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 16 states. [2019-10-15 02:56:27,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:56:27,255 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2019-10-15 02:56:27,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 02:56:27,256 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 19 [2019-10-15 02:56:27,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:56:27,257 INFO L225 Difference]: With dead ends: 36 [2019-10-15 02:56:27,257 INFO L226 Difference]: Without dead ends: 23 [2019-10-15 02:56:27,258 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2019-10-15 02:56:27,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-15 02:56:27,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-10-15 02:56:27,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-15 02:56:27,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-10-15 02:56:27,268 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2019-10-15 02:56:27,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:56:27,268 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-10-15 02:56:27,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-15 02:56:27,268 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-10-15 02:56:27,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 02:56:27,269 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:56:27,270 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:56:27,474 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:27,474 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:56:27,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:56:27,475 INFO L82 PathProgramCache]: Analyzing trace with hash 1180181446, now seen corresponding path program 2 times [2019-10-15 02:56:27,475 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:56:27,475 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709139017] [2019-10-15 02:56:27,475 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:27,475 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:27,475 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:56:27,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:27,588 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 02:56:27,589 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709139017] [2019-10-15 02:56:27,589 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170596353] [2019-10-15 02:56:27,589 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:27,671 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 02:56:27,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 02:56:27,673 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 02:56:27,679 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 02:56:28,257 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 02:56:28,257 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 02:56:28,347 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 02:56:28,348 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2086808741] [2019-10-15 02:56:28,349 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 02:56:28,349 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 02:56:28,350 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 02:56:28,350 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 02:56:28,350 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 02:56:28,381 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 02:56:28,818 INFO L199 IcfgInterpreter]: Interpreting procedure check with input of size 1 for LOIs [2019-10-15 02:56:28,822 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 02:56:28,825 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 02:56:29,284 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 02:56:29,285 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6, 10] total 23 [2019-10-15 02:56:29,285 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118294020] [2019-10-15 02:56:29,286 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-15 02:56:29,286 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:56:29,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-15 02:56:29,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2019-10-15 02:56:29,287 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 23 states. [2019-10-15 02:56:31,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 02:56:31,249 INFO L93 Difference]: Finished difference Result 43 states and 48 transitions. [2019-10-15 02:56:31,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 02:56:31,250 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 22 [2019-10-15 02:56:31,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 02:56:31,251 INFO L225 Difference]: With dead ends: 43 [2019-10-15 02:56:31,251 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 02:56:31,252 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=236, Invalid=1486, Unknown=0, NotChecked=0, Total=1722 [2019-10-15 02:56:31,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 02:56:31,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-10-15 02:56:31,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 02:56:31,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2019-10-15 02:56:31,269 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 22 [2019-10-15 02:56:31,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 02:56:31,269 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2019-10-15 02:56:31,269 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-15 02:56:31,269 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2019-10-15 02:56:31,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 02:56:31,270 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 02:56:31,270 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 02:56:31,475 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:31,475 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 02:56:31,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 02:56:31,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1445108340, now seen corresponding path program 3 times [2019-10-15 02:56:31,477 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 02:56:31,477 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [986954854] [2019-10-15 02:56:31,477 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:31,477 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 02:56:31,478 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 02:56:31,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 02:56:31,582 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-10-15 02:56:31,582 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [986954854] [2019-10-15 02:56:31,582 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508728222] [2019-10-15 02:56:31,583 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 02:56:31,673 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 02:56:31,674 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 02:56:31,675 INFO L256 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-15 02:56:31,680 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 02:56:45,737 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 02:56:45,738 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 02:56:45,926 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-15 02:56:45,926 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2022895896] [2019-10-15 02:56:45,928 INFO L162 IcfgInterpreter]: Started Sifa with 17 locations of interest [2019-10-15 02:56:45,928 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 02:56:45,928 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 02:56:45,929 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 02:56:45,929 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 02:56:45,952 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 27 for LOIs [2019-10-15 02:56:46,334 INFO L199 IcfgInterpreter]: Interpreting procedure check with input of size 1 for LOIs [2019-10-15 02:56:46,337 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 02:56:46,340 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 02:56:46,825 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 02:56:46,825 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9, 10] total 30 [2019-10-15 02:56:46,825 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733447139] [2019-10-15 02:56:46,827 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-15 02:56:46,827 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 02:56:46,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-15 02:56:46,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=745, Unknown=5, NotChecked=0, Total=870 [2019-10-15 02:56:46,828 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 30 states. [2019-10-15 02:56:49,730 WARN L191 SmtUtils]: Spent 2.06 s on a formula simplification that was a NOOP. DAG size: 56 [2019-10-15 02:56:51,822 WARN L191 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 60 [2019-10-15 02:56:53,960 WARN L191 SmtUtils]: Spent 2.07 s on a formula simplification that was a NOOP. DAG size: 43 [2019-10-15 02:57:00,205 WARN L191 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 42 [2019-10-15 02:57:02,405 WARN L191 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 42 [2019-10-15 02:57:07,241 WARN L191 SmtUtils]: Spent 1.19 s on a formula simplification. DAG size of input: 45 DAG size of output: 42