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/loops/vogal-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:04:21,092 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:04:21,096 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:04:21,116 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:04:21,116 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:04:21,118 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:04:21,120 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:04:21,130 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:04:21,135 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:04:21,138 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:04:21,140 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:04:21,141 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:04:21,141 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:04:21,143 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:04:21,145 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:04:21,147 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:04:21,148 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:04:21,149 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:04:21,151 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:04:21,156 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:04:21,160 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:04:21,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:04:21,165 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:04:21,166 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:04:21,168 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 03:04:21,168 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 03:04:21,169 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 03:04:21,170 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 03:04:21,172 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 03:04:21,173 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 03:04:21,174 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 03:04:21,175 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 03:04:21,176 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 03:04:21,177 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 03:04:21,178 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 03:04:21,179 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 03:04:21,179 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 03:04:21,180 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 03:04:21,180 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:04:21,181 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:04:21,182 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:04:21,183 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 03:04:21,212 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:04:21,212 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:04:21,214 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:04:21,214 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:04:21,214 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:04:21,214 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:04:21,215 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:04:21,215 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:04:21,215 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:04:21,215 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:04:21,215 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:04:21,216 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:04:21,216 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:04:21,216 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:04:21,216 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:04:21,216 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:04:21,216 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:04:21,217 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:04:21,217 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:04:21,217 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:04:21,217 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:04:21,217 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:04:21,218 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:04:21,218 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:04:21,218 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:04:21,218 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:04:21,218 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:04:21,219 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:04:21,219 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 03:04:21,525 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:04:21,538 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:04:21,542 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:04:21,543 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:04:21,544 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:04:21,544 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/vogal-1.i [2019-10-15 03:04:21,626 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ee93cd6b/9be23a5acc864e8ea4a624ab426ea593/FLAGc8d984c3d [2019-10-15 03:04:22,105 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:04:22,106 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/vogal-1.i [2019-10-15 03:04:22,114 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ee93cd6b/9be23a5acc864e8ea4a624ab426ea593/FLAGc8d984c3d [2019-10-15 03:04:22,450 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ee93cd6b/9be23a5acc864e8ea4a624ab426ea593 [2019-10-15 03:04:22,462 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:04:22,464 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:04:22,469 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:22,469 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:04:22,473 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:04:22,474 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,477 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32833bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22, skipping insertion in model container [2019-10-15 03:04:22,478 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,487 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:04:22,509 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:04:22,771 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:22,777 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:04:22,833 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:22,855 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:04:22,855 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22 WrapperNode [2019-10-15 03:04:22,855 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:22,856 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:04:22,856 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:04:22,856 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:04:22,955 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,955 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,964 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,964 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,975 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,988 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,991 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (1/1) ... [2019-10-15 03:04:22,995 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:04:23,003 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:04:23,003 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:04:23,003 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:04:23,009 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (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 03:04:23,059 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:04:23,059 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:04:23,059 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:04:23,060 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:04:23,060 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:04:23,060 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 03:04:23,060 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:04:23,060 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-10-15 03:04:23,061 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:04:23,061 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 03:04:23,061 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2019-10-15 03:04:23,061 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 03:04:23,061 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 03:04:23,062 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 03:04:23,062 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:04:23,062 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:04:23,663 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:04:23,663 INFO L284 CfgBuilder]: Removed 6 assume(true) statements. [2019-10-15 03:04:23,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:23 BoogieIcfgContainer [2019-10-15 03:04:23,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:04:23,666 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:04:23,666 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:04:23,671 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:04:23,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:04:22" (1/3) ... [2019-10-15 03:04:23,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@573134da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:23, skipping insertion in model container [2019-10-15 03:04:23,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:22" (2/3) ... [2019-10-15 03:04:23,674 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@573134da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:23, skipping insertion in model container [2019-10-15 03:04:23,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:23" (3/3) ... [2019-10-15 03:04:23,679 INFO L109 eAbstractionObserver]: Analyzing ICFG vogal-1.i [2019-10-15 03:04:23,687 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:04:23,694 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:04:23,707 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:04:23,733 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:04:23,733 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:04:23,733 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:04:23,734 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:04:23,734 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:04:23,734 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:04:23,734 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:04:23,734 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:04:23,753 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-10-15 03:04:23,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 03:04:23,760 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:23,762 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:23,764 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:23,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:23,770 INFO L82 PathProgramCache]: Analyzing trace with hash 1006628031, now seen corresponding path program 1 times [2019-10-15 03:04:23,779 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:23,780 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719947469] [2019-10-15 03:04:23,780 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:23,780 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:23,780 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:23,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:23,936 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 03:04:23,937 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719947469] [2019-10-15 03:04:23,938 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:23,938 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 03:04:23,939 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854168944] [2019-10-15 03:04:23,944 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 03:04:23,944 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:23,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 03:04:23,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:04:23,974 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2019-10-15 03:04:24,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:24,007 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2019-10-15 03:04:24,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 03:04:24,009 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2019-10-15 03:04:24,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:24,016 INFO L225 Difference]: With dead ends: 45 [2019-10-15 03:04:24,017 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 03:04:24,023 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 03:04:24,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 03:04:24,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 03:04:24,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 03:04:24,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2019-10-15 03:04:24,064 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 15 [2019-10-15 03:04:24,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:24,065 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2019-10-15 03:04:24,065 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 03:04:24,065 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2019-10-15 03:04:24,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 03:04:24,066 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:24,067 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 03:04:24,067 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:24,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:24,068 INFO L82 PathProgramCache]: Analyzing trace with hash 154465315, now seen corresponding path program 1 times [2019-10-15 03:04:24,068 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:24,068 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744106829] [2019-10-15 03:04:24,069 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:24,069 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:24,069 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:24,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:24,216 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 03:04:24,217 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744106829] [2019-10-15 03:04:24,217 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:24,218 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:04:24,218 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [931374728] [2019-10-15 03:04:24,222 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:04:24,222 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:24,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:04:24,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:04:24,224 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand 3 states. [2019-10-15 03:04:24,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:24,324 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2019-10-15 03:04:24,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:04:24,325 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-15 03:04:24,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:24,328 INFO L225 Difference]: With dead ends: 41 [2019-10-15 03:04:24,329 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 03:04:24,330 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 03:04:24,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 03:04:24,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 21. [2019-10-15 03:04:24,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 03:04:24,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2019-10-15 03:04:24,338 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 17 [2019-10-15 03:04:24,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:24,338 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2019-10-15 03:04:24,338 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:04:24,338 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2019-10-15 03:04:24,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 03:04:24,339 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:24,340 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:24,340 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:24,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:24,341 INFO L82 PathProgramCache]: Analyzing trace with hash -415101532, now seen corresponding path program 1 times [2019-10-15 03:04:24,341 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:24,341 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1227891442] [2019-10-15 03:04:24,342 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:24,342 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:24,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:24,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:24,494 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 03:04:24,494 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1227891442] [2019-10-15 03:04:24,495 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030532837] [2019-10-15 03:04:24,495 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 03:04:24,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:24,572 INFO L256 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-15 03:04:24,580 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:24,639 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 03:04:24,640 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:24,717 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 03:04:24,718 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 03:04:24,718 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [4] total 12 [2019-10-15 03:04:24,718 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553113079] [2019-10-15 03:04:24,719 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-15 03:04:24,720 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:24,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-15 03:04:24,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2019-10-15 03:04:24,723 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand 10 states. [2019-10-15 03:04:24,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:24,824 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2019-10-15 03:04:24,825 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:04:24,825 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 18 [2019-10-15 03:04:24,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:24,827 INFO L225 Difference]: With dead ends: 35 [2019-10-15 03:04:24,828 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 03:04:24,828 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2019-10-15 03:04:24,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 03:04:24,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2019-10-15 03:04:24,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-15 03:04:24,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2019-10-15 03:04:24,838 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 18 [2019-10-15 03:04:24,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:24,838 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2019-10-15 03:04:24,839 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-15 03:04:24,839 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2019-10-15 03:04:24,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 03:04:24,841 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:24,841 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:25,045 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:25,046 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:25,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:25,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1072112129, now seen corresponding path program 1 times [2019-10-15 03:04:25,047 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:25,047 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308126989] [2019-10-15 03:04:25,048 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,048 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,048 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:25,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,176 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:25,177 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308126989] [2019-10-15 03:04:25,177 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:25,177 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:04:25,178 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924971133] [2019-10-15 03:04:25,178 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:04:25,178 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:25,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:04:25,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:04:25,179 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 3 states. [2019-10-15 03:04:25,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:25,206 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2019-10-15 03:04:25,207 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:04:25,207 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2019-10-15 03:04:25,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:25,209 INFO L225 Difference]: With dead ends: 52 [2019-10-15 03:04:25,209 INFO L226 Difference]: Without dead ends: 37 [2019-10-15 03:04:25,209 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 2 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 03:04:25,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-15 03:04:25,216 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2019-10-15 03:04:25,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 03:04:25,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 39 transitions. [2019-10-15 03:04:25,217 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 39 transitions. Word has length 21 [2019-10-15 03:04:25,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:25,218 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 39 transitions. [2019-10-15 03:04:25,218 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:04:25,218 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 39 transitions. [2019-10-15 03:04:25,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 03:04:25,219 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:25,219 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:25,219 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:25,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:25,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1398520043, now seen corresponding path program 1 times [2019-10-15 03:04:25,220 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:25,221 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273837404] [2019-10-15 03:04:25,221 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,221 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:25,221 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:25,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:04:25,366 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273837404] [2019-10-15 03:04:25,366 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151525524] [2019-10-15 03:04:25,366 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 03:04:25,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:25,432 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-15 03:04:25,436 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:25,497 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-10-15 03:04:25,497 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:25,513 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:25,514 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:25,514 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-15 03:04:25,610 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-15 03:04:25,611 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:25,613 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:25,614 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:25,614 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-15 03:04:25,650 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:04:25,651 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:25,910 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:25,910 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 03:04:25,910 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 9] total 15 [2019-10-15 03:04:25,911 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617863344] [2019-10-15 03:04:25,913 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 03:04:25,914 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:25,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 03:04:25,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2019-10-15 03:04:25,914 INFO L87 Difference]: Start difference. First operand 30 states and 39 transitions. Second operand 7 states. [2019-10-15 03:04:26,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:26,332 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2019-10-15 03:04:26,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 03:04:26,333 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2019-10-15 03:04:26,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:26,338 INFO L225 Difference]: With dead ends: 43 [2019-10-15 03:04:26,339 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 03:04:26,344 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2019-10-15 03:04:26,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 03:04:26,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-10-15 03:04:26,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 03:04:26,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2019-10-15 03:04:26,367 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 22 [2019-10-15 03:04:26,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:26,369 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2019-10-15 03:04:26,369 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 03:04:26,370 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2019-10-15 03:04:26,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 03:04:26,373 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:26,374 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:26,584 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:26,584 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:26,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:26,585 INFO L82 PathProgramCache]: Analyzing trace with hash -392356454, now seen corresponding path program 1 times [2019-10-15 03:04:26,585 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:26,585 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295810317] [2019-10-15 03:04:26,585 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:26,585 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:26,585 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:26,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:26,730 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 03:04:26,731 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295810317] [2019-10-15 03:04:26,731 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398029793] [2019-10-15 03:04:26,731 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 03:04:26,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:26,805 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-15 03:04:26,809 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:26,828 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2019-10-15 03:04:26,830 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,836 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:26,837 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,837 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-15 03:04:26,972 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 8 [2019-10-15 03:04:26,973 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,980 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 03:04:26,981 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 03:04:26,982 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:16, output treesize:4 [2019-10-15 03:04:27,005 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 03:04:27,006 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:27,175 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:04:27,176 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 03:04:27,176 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [4, 9] total 15 [2019-10-15 03:04:27,177 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034932505] [2019-10-15 03:04:27,179 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-15 03:04:27,179 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:27,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-15 03:04:27,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2019-10-15 03:04:27,180 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 7 states. [2019-10-15 03:04:27,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:27,447 INFO L93 Difference]: Finished difference Result 42 states and 55 transitions. [2019-10-15 03:04:27,448 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 03:04:27,448 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-15 03:04:27,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:27,449 INFO L225 Difference]: With dead ends: 42 [2019-10-15 03:04:27,449 INFO L226 Difference]: Without dead ends: 37 [2019-10-15 03:04:27,450 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2019-10-15 03:04:27,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-15 03:04:27,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 30. [2019-10-15 03:04:27,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 03:04:27,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 38 transitions. [2019-10-15 03:04:27,457 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 38 transitions. Word has length 23 [2019-10-15 03:04:27,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:27,458 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 38 transitions. [2019-10-15 03:04:27,458 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-15 03:04:27,458 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 38 transitions. [2019-10-15 03:04:27,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-15 03:04:27,459 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:27,459 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:27,673 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:27,674 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:27,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:27,674 INFO L82 PathProgramCache]: Analyzing trace with hash 996109488, now seen corresponding path program 1 times [2019-10-15 03:04:27,675 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:27,675 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159797553] [2019-10-15 03:04:27,675 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:27,676 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:27,676 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:27,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:27,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 03:04:27,849 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159797553] [2019-10-15 03:04:27,849 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943079171] [2019-10-15 03:04:27,850 INFO L94 rtionOrderModulation]: Keeping assertion order 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 03:04:27,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:27,922 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 03:04:27,924 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:27,944 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-15 03:04:27,945 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:28,013 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 03:04:28,013 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1188783605] [2019-10-15 03:04:28,044 INFO L162 IcfgInterpreter]: Started Sifa with 19 locations of interest [2019-10-15 03:04:28,045 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:28,053 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:28,061 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:28,062 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:28,193 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:04:28,416 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 03:04:29,100 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-10-15 03:04:29,123 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:04:29,131 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:30,192 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:04:30,192 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5, 17] total 24 [2019-10-15 03:04:30,192 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206416431] [2019-10-15 03:04:30,195 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 03:04:30,196 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:30,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 03:04:30,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2019-10-15 03:04:30,197 INFO L87 Difference]: Start difference. First operand 30 states and 38 transitions. Second operand 24 states. [2019-10-15 03:04:31,590 WARN L191 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 47 [2019-10-15 03:04:32,050 WARN L191 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 53 [2019-10-15 03:04:33,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:33,243 INFO L93 Difference]: Finished difference Result 98 states and 136 transitions. [2019-10-15 03:04:33,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-15 03:04:33,244 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 24 [2019-10-15 03:04:33,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:33,245 INFO L225 Difference]: With dead ends: 98 [2019-10-15 03:04:33,245 INFO L226 Difference]: Without dead ends: 73 [2019-10-15 03:04:33,247 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 549 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=338, Invalid=2112, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 03:04:33,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-10-15 03:04:33,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 32. [2019-10-15 03:04:33,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 03:04:33,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2019-10-15 03:04:33,256 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 24 [2019-10-15 03:04:33,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:33,256 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2019-10-15 03:04:33,256 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 03:04:33,257 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2019-10-15 03:04:33,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-15 03:04:33,257 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:33,258 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:33,470 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:33,470 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:33,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:33,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1447556309, now seen corresponding path program 1 times [2019-10-15 03:04:33,471 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:33,471 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017360967] [2019-10-15 03:04:33,472 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:33,472 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:33,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:33,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:33,594 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:04:33,594 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017360967] [2019-10-15 03:04:33,594 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [903928145] [2019-10-15 03:04:33,595 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-15 03:04:33,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:33,699 INFO L256 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 03:04:33,704 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:33,739 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 03:04:33,740 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:33,764 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 03:04:33,764 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 03:04:33,765 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5, 3] total 7 [2019-10-15 03:04:33,766 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224441294] [2019-10-15 03:04:33,767 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:04:33,769 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:33,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:04:33,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-15 03:04:33,770 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand 3 states. [2019-10-15 03:04:33,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:33,820 INFO L93 Difference]: Finished difference Result 47 states and 61 transitions. [2019-10-15 03:04:33,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:04:33,821 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2019-10-15 03:04:33,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:33,823 INFO L225 Difference]: With dead ends: 47 [2019-10-15 03:04:33,823 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 03:04:33,824 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-15 03:04:33,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 03:04:33,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2019-10-15 03:04:33,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 03:04:33,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2019-10-15 03:04:33,844 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 27 [2019-10-15 03:04:33,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:33,846 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2019-10-15 03:04:33,847 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:04:33,847 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2019-10-15 03:04:33,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 03:04:33,852 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:33,852 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:34,058 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:34,058 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:34,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:34,059 INFO L82 PathProgramCache]: Analyzing trace with hash -559822302, now seen corresponding path program 1 times [2019-10-15 03:04:34,059 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:34,059 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983589734] [2019-10-15 03:04:34,059 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:34,059 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:34,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:34,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:34,187 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-15 03:04:34,188 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983589734] [2019-10-15 03:04:34,188 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993888808] [2019-10-15 03:04:34,188 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:34,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:34,280 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-15 03:04:34,289 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:34,730 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 03:04:34,730 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:34,975 WARN L191 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 46 [2019-10-15 03:04:35,275 WARN L225 Elim1Store]: Array PQE input equivalent to true [2019-10-15 03:04:35,559 WARN L225 Elim1Store]: Array PQE input equivalent to true [2019-10-15 03:04:35,919 WARN L191 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 116 DAG size of output: 57 [2019-10-15 03:04:36,493 WARN L191 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 68 [2019-10-15 03:04:36,947 WARN L191 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 82 DAG size of output: 58