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/loop-acceleration/array_3-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:00:58,604 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:00:58,607 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:00:58,626 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:00:58,626 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:00:58,628 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:00:58,630 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:00:58,640 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:00:58,645 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:00:58,647 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:00:58,649 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:00:58,650 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:00:58,650 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:00:58,652 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:00:58,654 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:00:58,655 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:00:58,656 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:00:58,657 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:00:58,658 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:00:58,660 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:00:58,661 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:00:58,664 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:00:58,665 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:00:58,666 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:00:58,668 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:00:58,675 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:00:58,676 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:00:58,677 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:00:58,678 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 03:00:58,704 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:00:58,704 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:00:58,710 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:00:58,711 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:00:58,711 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:00:58,711 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:00:58,711 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:00:58,711 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:00:58,712 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:00:58,712 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:00:58,712 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:00:58,712 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:00:58,712 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:00:58,713 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:00:58,713 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:00:58,713 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:00:58,716 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:00:58,716 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:00:58,717 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:00:58,717 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:00:58,717 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:00:58,717 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:00:58,717 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:00:58,718 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:00:58,718 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:00:58,718 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:00:58,718 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:00:58,718 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:00:58,719 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 03:00:58,984 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:00:58,996 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:00:59,000 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:00:59,001 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:00:59,001 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:00:59,002 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i [2019-10-15 03:00:59,082 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/51b58cafa/13c345eeea194577a6c1bf8428ec5206/FLAG6a6be55cd [2019-10-15 03:00:59,513 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:00:59,514 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i [2019-10-15 03:00:59,520 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/51b58cafa/13c345eeea194577a6c1bf8428ec5206/FLAG6a6be55cd [2019-10-15 03:00:59,919 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/51b58cafa/13c345eeea194577a6c1bf8428ec5206 [2019-10-15 03:00:59,930 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:00:59,931 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:00:59,932 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:00:59,932 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:00:59,936 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:00:59,937 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:00:59" (1/1) ... [2019-10-15 03:00:59,939 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6581bd7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:00:59, skipping insertion in model container [2019-10-15 03:00:59,940 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:00:59" (1/1) ... [2019-10-15 03:00:59,947 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:00:59,964 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:01:00,127 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:01:00,131 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:01:00,149 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:01:00,167 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:01:00,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00 WrapperNode [2019-10-15 03:01:00,167 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:01:00,168 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:01:00,168 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:01:00,168 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:01:00,267 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,267 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,277 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,279 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,291 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,297 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,300 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (1/1) ... [2019-10-15 03:01:00,302 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:01:00,305 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:01:00,305 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:01:00,306 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:01:00,306 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (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 03:01:00,364 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:01:00,365 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:01:00,365 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:01:00,365 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:01:00,365 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:01:00,365 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:01:00,366 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 03:01:00,366 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:01:00,366 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 03:01:00,366 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 03:01:00,366 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 03:01:00,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 03:01:00,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:01:00,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:01:00,679 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:01:00,680 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 03:01:00,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:01:00 BoogieIcfgContainer [2019-10-15 03:01:00,683 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:01:00,684 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:01:00,684 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:01:00,687 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:01:00,687 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:00:59" (1/3) ... [2019-10-15 03:01:00,688 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fff70b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:01:00, skipping insertion in model container [2019-10-15 03:01:00,688 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:01:00" (2/3) ... [2019-10-15 03:01:00,688 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fff70b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:01:00, skipping insertion in model container [2019-10-15 03:01:00,688 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:01:00" (3/3) ... [2019-10-15 03:01:00,690 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2019-10-15 03:01:00,703 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:01:00,711 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:01:00,721 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:01:00,741 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:01:00,741 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:01:00,741 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:01:00,741 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:01:00,741 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:01:00,741 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:01:00,741 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:01:00,741 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:01:00,755 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2019-10-15 03:01:00,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 03:01:00,761 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:00,762 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:00,763 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:00,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:00,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1037966573, now seen corresponding path program 1 times [2019-10-15 03:01:00,775 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:00,775 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338808621] [2019-10-15 03:01:00,776 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:00,776 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:00,776 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:00,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:00,889 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 03:01:00,889 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338808621] [2019-10-15 03:01:00,890 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:01:00,890 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 03:01:00,891 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275377642] [2019-10-15 03:01:00,895 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 03:01:00,895 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:00,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 03:01:00,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:01:00,912 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2019-10-15 03:01:00,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:00,934 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-10-15 03:01:00,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 03:01:00,936 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2019-10-15 03:01:00,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:00,942 INFO L225 Difference]: With dead ends: 30 [2019-10-15 03:01:00,943 INFO L226 Difference]: Without dead ends: 13 [2019-10-15 03:01:00,945 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 03:01:00,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2019-10-15 03:01:00,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2019-10-15 03:01:00,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2019-10-15 03:01:00,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2019-10-15 03:01:00,983 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 11 [2019-10-15 03:01:00,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:00,984 INFO L462 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2019-10-15 03:01:00,984 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 03:01:00,984 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2019-10-15 03:01:00,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 03:01:00,985 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:00,985 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:00,986 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:00,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:00,986 INFO L82 PathProgramCache]: Analyzing trace with hash -1362773192, now seen corresponding path program 1 times [2019-10-15 03:01:00,987 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:00,987 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038712957] [2019-10-15 03:01:00,987 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:00,988 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:00,988 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:01,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:01,114 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 03:01:01,115 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038712957] [2019-10-15 03:01:01,116 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:01:01,116 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:01:01,116 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460449031] [2019-10-15 03:01:01,119 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:01:01,120 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:01,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:01:01,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:01:01,121 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2019-10-15 03:01:01,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:01,171 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-10-15 03:01:01,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:01:01,174 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 03:01:01,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:01,177 INFO L225 Difference]: With dead ends: 24 [2019-10-15 03:01:01,177 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 03:01:01,178 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 03:01:01,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 03:01:01,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 14. [2019-10-15 03:01:01,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-15 03:01:01,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-15 03:01:01,190 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2019-10-15 03:01:01,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:01,190 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-15 03:01:01,191 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:01:01,191 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-15 03:01:01,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 03:01:01,192 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:01,193 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:01,194 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:01,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:01,195 INFO L82 PathProgramCache]: Analyzing trace with hash 723631731, now seen corresponding path program 1 times [2019-10-15 03:01:01,196 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:01,197 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [365968004] [2019-10-15 03:01:01,198 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:01,198 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:01,198 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:01,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:01,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:01:01,302 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [365968004] [2019-10-15 03:01:01,302 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:01:01,302 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 03:01:01,303 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19553161] [2019-10-15 03:01:01,303 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 03:01:01,303 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:01,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 03:01:01,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 03:01:01,304 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2019-10-15 03:01:01,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:01,368 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2019-10-15 03:01:01,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 03:01:01,369 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-10-15 03:01:01,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:01,370 INFO L225 Difference]: With dead ends: 21 [2019-10-15 03:01:01,370 INFO L226 Difference]: Without dead ends: 16 [2019-10-15 03:01:01,370 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 03:01:01,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-15 03:01:01,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-10-15 03:01:01,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-15 03:01:01,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2019-10-15 03:01:01,378 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 13 [2019-10-15 03:01:01,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:01,379 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2019-10-15 03:01:01,379 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 03:01:01,379 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2019-10-15 03:01:01,380 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 03:01:01,380 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:01,381 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:01,381 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:01,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:01,382 INFO L82 PathProgramCache]: Analyzing trace with hash 671297680, now seen corresponding path program 1 times [2019-10-15 03:01:01,382 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:01,382 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820108571] [2019-10-15 03:01:01,382 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:01,383 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:01,383 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:01,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:01,496 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:01:01,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820108571] [2019-10-15 03:01:01,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977016690] [2019-10-15 03:01:01,497 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 03:01:01,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:01,549 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 03:01:01,558 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:01,599 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 03:01:01,600 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:01,646 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 03:01:01,646 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963364661] [2019-10-15 03:01:01,707 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 03:01:01,708 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:01,716 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:01,726 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:01,726 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:01,910 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:01:02,222 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2019-10-15 03:01:02,235 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:01:02,242 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:02,666 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:02,666 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4, 10] total 18 [2019-10-15 03:01:02,667 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761316148] [2019-10-15 03:01:02,668 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 03:01:02,668 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:02,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 03:01:02,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-10-15 03:01:02,670 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 18 states. [2019-10-15 03:01:03,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:03,603 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2019-10-15 03:01:03,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 03:01:03,603 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 15 [2019-10-15 03:01:03,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:03,604 INFO L225 Difference]: With dead ends: 39 [2019-10-15 03:01:03,605 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 03:01:03,606 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 211 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=194, Invalid=862, Unknown=0, NotChecked=0, Total=1056 [2019-10-15 03:01:03,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 03:01:03,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2019-10-15 03:01:03,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 03:01:03,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2019-10-15 03:01:03,613 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2019-10-15 03:01:03,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:03,613 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2019-10-15 03:01:03,613 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 03:01:03,613 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2019-10-15 03:01:03,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 03:01:03,614 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:03,614 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:03,824 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:03,825 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:03,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:03,826 INFO L82 PathProgramCache]: Analyzing trace with hash 911849586, now seen corresponding path program 2 times [2019-10-15 03:01:03,826 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:03,827 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593430260] [2019-10-15 03:01:03,827 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:03,827 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:03,828 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:03,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:03,892 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 03:01:03,892 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593430260] [2019-10-15 03:01:03,892 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [867030976] [2019-10-15 03:01:03,893 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 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 03:01:03,955 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 03:01:03,956 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:01:03,957 INFO L256 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 03:01:03,959 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:04,003 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:01:04,003 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:04,078 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:01:04,079 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [629680797] [2019-10-15 03:01:04,081 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 03:01:04,081 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:04,081 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:04,082 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:04,082 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:04,137 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:01:04,310 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2019-10-15 03:01:04,331 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:01:04,341 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:04,653 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:04,653 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 10] total 24 [2019-10-15 03:01:04,653 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871531228] [2019-10-15 03:01:04,654 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 03:01:04,655 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:04,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 03:01:04,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2019-10-15 03:01:04,656 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 24 states. [2019-10-15 03:01:06,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:06,109 INFO L93 Difference]: Finished difference Result 64 states and 79 transitions. [2019-10-15 03:01:06,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-15 03:01:06,109 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2019-10-15 03:01:06,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:06,111 INFO L225 Difference]: With dead ends: 64 [2019-10-15 03:01:06,112 INFO L226 Difference]: Without dead ends: 48 [2019-10-15 03:01:06,115 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=485, Invalid=1965, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 03:01:06,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-15 03:01:06,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 33. [2019-10-15 03:01:06,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 03:01:06,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2019-10-15 03:01:06,128 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 20 [2019-10-15 03:01:06,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:06,129 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2019-10-15 03:01:06,129 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 03:01:06,129 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2019-10-15 03:01:06,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-15 03:01:06,130 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:06,130 INFO L380 BasicCegarLoop]: trace histogram [10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:06,337 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:06,337 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:06,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:06,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1735843817, now seen corresponding path program 3 times [2019-10-15 03:01:06,338 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:06,339 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573706610] [2019-10-15 03:01:06,339 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:06,339 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:06,340 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:06,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:06,571 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-15 03:01:06,571 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573706610] [2019-10-15 03:01:06,571 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101573361] [2019-10-15 03:01:06,571 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 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 03:01:06,652 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 03:01:06,652 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:01:06,654 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-15 03:01:06,662 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:06,838 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 03:01:06,838 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:07,170 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-10-15 03:01:07,171 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1848669916] [2019-10-15 03:01:07,172 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 03:01:07,172 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:07,173 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:07,173 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:07,173 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:07,198 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:01:07,324 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2019-10-15 03:01:07,333 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:01:07,337 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:07,669 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:07,670 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 10] total 36 [2019-10-15 03:01:07,670 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134627766] [2019-10-15 03:01:07,671 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-15 03:01:07,671 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:07,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-15 03:01:07,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=330, Invalid=930, Unknown=0, NotChecked=0, Total=1260 [2019-10-15 03:01:07,672 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 36 states. [2019-10-15 03:01:10,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:10,480 INFO L93 Difference]: Finished difference Result 115 states and 145 transitions. [2019-10-15 03:01:10,481 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-10-15 03:01:10,481 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 32 [2019-10-15 03:01:10,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:10,484 INFO L225 Difference]: With dead ends: 115 [2019-10-15 03:01:10,484 INFO L226 Difference]: Without dead ends: 90 [2019-10-15 03:01:10,488 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1719 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=1556, Invalid=5250, Unknown=0, NotChecked=0, Total=6806 [2019-10-15 03:01:10,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-10-15 03:01:10,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 57. [2019-10-15 03:01:10,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-15 03:01:10,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2019-10-15 03:01:10,502 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 32 [2019-10-15 03:01:10,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:10,503 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2019-10-15 03:01:10,503 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-15 03:01:10,503 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2019-10-15 03:01:10,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-10-15 03:01:10,504 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:10,505 INFO L380 BasicCegarLoop]: trace histogram [22, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:10,709 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:10,710 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:10,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:10,711 INFO L82 PathProgramCache]: Analyzing trace with hash -705794281, now seen corresponding path program 4 times [2019-10-15 03:01:10,712 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:10,712 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [866839050] [2019-10-15 03:01:10,712 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:10,712 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:10,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:10,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:10,992 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-15 03:01:10,992 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [866839050] [2019-10-15 03:01:10,993 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722665139] [2019-10-15 03:01:10,993 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 03:01:11,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:11,081 INFO L256 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-15 03:01:11,084 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:01:11,289 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-15 03:01:11,289 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:01:12,101 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-10-15 03:01:12,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [419292209] [2019-10-15 03:01:12,103 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 03:01:12,103 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:01:12,104 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:01:12,104 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:01:12,104 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:01:12,125 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:01:12,224 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 25 for LOIs [2019-10-15 03:01:12,231 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:01:12,234 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:01:12,615 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:01:12,615 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 25, 25, 10] total 60 [2019-10-15 03:01:12,615 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620875082] [2019-10-15 03:01:12,616 INFO L442 AbstractCegarLoop]: Interpolant automaton has 60 states [2019-10-15 03:01:12,617 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:01:12,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2019-10-15 03:01:12,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1206, Invalid=2334, Unknown=0, NotChecked=0, Total=3540 [2019-10-15 03:01:12,620 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 60 states. [2019-10-15 03:01:19,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:01:19,149 INFO L93 Difference]: Finished difference Result 217 states and 277 transitions. [2019-10-15 03:01:19,151 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2019-10-15 03:01:19,151 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 56 [2019-10-15 03:01:19,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:01:19,153 INFO L225 Difference]: With dead ends: 217 [2019-10-15 03:01:19,153 INFO L226 Difference]: Without dead ends: 174 [2019-10-15 03:01:19,160 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5514 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=5723, Invalid=16329, Unknown=0, NotChecked=0, Total=22052 [2019-10-15 03:01:19,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-10-15 03:01:19,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 105. [2019-10-15 03:01:19,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-10-15 03:01:19,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 106 transitions. [2019-10-15 03:01:19,178 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 106 transitions. Word has length 56 [2019-10-15 03:01:19,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:01:19,178 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 106 transitions. [2019-10-15 03:01:19,178 INFO L463 AbstractCegarLoop]: Interpolant automaton has 60 states. [2019-10-15 03:01:19,178 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 106 transitions. [2019-10-15 03:01:19,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-10-15 03:01:19,181 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:01:19,181 INFO L380 BasicCegarLoop]: trace histogram [46, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:01:19,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:01:19,388 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:01:19,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:01:19,389 INFO L82 PathProgramCache]: Analyzing trace with hash -97464717, now seen corresponding path program 5 times [2019-10-15 03:01:19,389 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:01:19,390 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680986596] [2019-10-15 03:01:19,390 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:19,390 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:01:19,390 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:01:19,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:01:19,909 INFO L134 CoverageAnalysis]: Checked inductivity of 1633 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-10-15 03:01:19,910 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680986596] [2019-10-15 03:01:19,910 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792617416] [2019-10-15 03:01:19,910 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 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true