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/array-tiling/rewnif.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:38:48,363 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:38:48,365 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:38:48,377 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:38:48,378 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:38:48,379 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:38:48,380 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:38:48,382 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:38:48,383 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:38:48,384 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:38:48,385 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:38:48,386 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:38:48,386 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:38:48,388 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:38:48,388 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:38:48,389 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:38:48,390 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:38:48,391 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:38:48,393 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:38:48,395 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:38:48,396 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:38:48,397 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:38:48,399 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:38:48,399 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:38:48,402 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 01:38:48,402 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 01:38:48,402 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 01:38:48,403 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 01:38:48,404 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 01:38:48,405 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 01:38:48,405 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:38:48,406 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:38:48,406 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:38:48,407 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:38:48,408 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:38:48,408 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:38:48,409 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:38:48,409 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:38:48,409 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:38:48,410 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:38:48,411 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:38:48,412 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 01:38:48,429 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:38:48,429 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:38:48,431 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:38:48,431 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:38:48,431 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:38:48,431 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:38:48,432 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:38:48,432 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:38:48,432 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:38:48,433 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:38:48,433 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:38:48,433 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:38:48,433 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:38:48,434 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:38:48,434 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:38:48,434 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:38:48,434 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:38:48,434 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:38:48,435 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:38:48,435 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:38:48,436 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:38:48,437 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:38:48,437 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:38:48,437 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:38:48,437 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:38:48,438 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:38:48,438 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:38:48,438 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:38:48,438 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 01:38:48,778 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:38:48,796 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:38:48,800 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:38:48,803 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:38:48,803 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:38:48,804 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/rewnif.c [2019-10-15 01:38:48,879 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b5ed7d59/68eebb137e624a798a4026ff0dd9b095/FLAG39d7d04ab [2019-10-15 01:38:49,284 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:38:49,285 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnif.c [2019-10-15 01:38:49,293 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b5ed7d59/68eebb137e624a798a4026ff0dd9b095/FLAG39d7d04ab [2019-10-15 01:38:49,721 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6b5ed7d59/68eebb137e624a798a4026ff0dd9b095 [2019-10-15 01:38:49,732 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:38:49,737 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:38:49,738 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:49,738 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:38:49,741 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:38:49,742 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:49" (1/1) ... [2019-10-15 01:38:49,745 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2145fe62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:49, skipping insertion in model container [2019-10-15 01:38:49,746 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:49" (1/1) ... [2019-10-15 01:38:49,753 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:38:49,774 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:38:49,977 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:49,998 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:38:50,023 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:50,043 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:38:50,043 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50 WrapperNode [2019-10-15 01:38:50,043 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:50,044 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:38:50,044 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:38:50,044 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:38:50,138 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,145 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,155 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,156 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,171 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,180 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,182 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (1/1) ... [2019-10-15 01:38:50,186 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:38:50,187 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:38:50,187 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:38:50,187 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:38:50,191 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (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 01:38:50,253 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:38:50,253 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:38:50,253 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:38:50,253 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:38:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:38:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:38:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:38:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:38:50,254 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:38:50,255 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:38:50,615 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:38:50,615 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:38:50,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:50 BoogieIcfgContainer [2019-10-15 01:38:50,616 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:38:50,618 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:38:50,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:38:50,620 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:38:50,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:38:49" (1/3) ... [2019-10-15 01:38:50,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5dd1b37e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:50, skipping insertion in model container [2019-10-15 01:38:50,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:50" (2/3) ... [2019-10-15 01:38:50,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5dd1b37e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:50, skipping insertion in model container [2019-10-15 01:38:50,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:50" (3/3) ... [2019-10-15 01:38:50,624 INFO L109 eAbstractionObserver]: Analyzing ICFG rewnif.c [2019-10-15 01:38:50,633 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:38:50,640 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:38:50,651 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:38:50,676 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:38:50,676 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:38:50,676 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:38:50,676 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:38:50,676 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:38:50,677 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:38:50,677 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:38:50,677 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:38:50,695 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-10-15 01:38:50,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:38:50,701 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:50,702 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:50,704 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:50,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:50,710 INFO L82 PathProgramCache]: Analyzing trace with hash 698834392, now seen corresponding path program 1 times [2019-10-15 01:38:50,719 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:50,719 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871060957] [2019-10-15 01:38:50,719 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:50,720 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:50,720 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:50,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:50,895 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 01:38:50,896 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871060957] [2019-10-15 01:38:50,896 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:50,897 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:38:50,897 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322547910] [2019-10-15 01:38:50,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:38:50,901 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:50,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:38:50,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:38:50,914 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2019-10-15 01:38:50,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:50,990 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2019-10-15 01:38:50,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:38:50,992 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:38:50,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:51,002 INFO L225 Difference]: With dead ends: 34 [2019-10-15 01:38:51,002 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 01:38:51,008 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 01:38:51,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 01:38:51,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-15 01:38:51,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 01:38:51,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-15 01:38:51,040 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-10-15 01:38:51,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:51,041 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-15 01:38:51,041 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:38:51,041 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-15 01:38:51,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:38:51,042 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:51,042 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:51,043 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:51,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:51,043 INFO L82 PathProgramCache]: Analyzing trace with hash -494855414, now seen corresponding path program 1 times [2019-10-15 01:38:51,043 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:51,044 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1725887070] [2019-10-15 01:38:51,044 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:51,044 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:51,044 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:51,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:51,130 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 01:38:51,130 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1725887070] [2019-10-15 01:38:51,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1944076590] [2019-10-15 01:38:51,131 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 01:38:51,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:51,208 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:38:51,214 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:51,284 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 01:38:51,285 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:51,328 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 01:38:51,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205046818] [2019-10-15 01:38:51,358 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:38:51,358 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:51,385 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:51,399 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:51,400 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:51,652 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:38:52,175 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2019-10-15 01:38:52,198 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:38:52,210 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:52,773 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 23 [2019-10-15 01:38:53,101 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:53,101 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:38:53,102 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848004781] [2019-10-15 01:38:53,105 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:38:53,106 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:53,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:38:53,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:38:53,109 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 18 states. [2019-10-15 01:38:53,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:53,694 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2019-10-15 01:38:53,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-15 01:38:53,695 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 13 [2019-10-15 01:38:53,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:53,696 INFO L225 Difference]: With dead ends: 36 [2019-10-15 01:38:53,696 INFO L226 Difference]: Without dead ends: 27 [2019-10-15 01:38:53,698 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=102, Invalid=498, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:38:53,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-15 01:38:53,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 18. [2019-10-15 01:38:53,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:38:53,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-15 01:38:53,720 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-10-15 01:38:53,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:53,721 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-15 01:38:53,721 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:38:53,721 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-15 01:38:53,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:38:53,722 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:53,722 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:53,935 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:53,935 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:53,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:53,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1155466264, now seen corresponding path program 2 times [2019-10-15 01:38:53,936 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:53,936 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426902076] [2019-10-15 01:38:53,936 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,937 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,937 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:53,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:54,198 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:54,198 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426902076] [2019-10-15 01:38:54,198 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359955389] [2019-10-15 01:38:54,199 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 01:38:54,257 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:38:54,257 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:54,259 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-15 01:38:54,261 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:54,571 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:54,571 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:54,757 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:54,758 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1215588980] [2019-10-15 01:38:54,759 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:38:54,759 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:54,760 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:54,760 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:54,760 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:54,797 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:38:55,063 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2019-10-15 01:38:55,073 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:38:55,080 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:55,953 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:55,953 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 31 [2019-10-15 01:38:55,954 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748116561] [2019-10-15 01:38:55,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-15 01:38:55,955 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:55,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-15 01:38:55,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=815, Unknown=0, NotChecked=0, Total=930 [2019-10-15 01:38:55,956 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 31 states. [2019-10-15 01:38:56,668 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 62 [2019-10-15 01:38:57,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:57,106 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2019-10-15 01:38:57,106 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 01:38:57,106 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 14 [2019-10-15 01:38:57,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:57,109 INFO L225 Difference]: With dead ends: 30 [2019-10-15 01:38:57,109 INFO L226 Difference]: Without dead ends: 28 [2019-10-15 01:38:57,110 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=192, Invalid=1290, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:38:57,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-15 01:38:57,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2019-10-15 01:38:57,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:38:57,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-10-15 01:38:57,136 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 14 [2019-10-15 01:38:57,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:57,136 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-10-15 01:38:57,136 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-15 01:38:57,137 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-10-15 01:38:57,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:38:57,140 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:57,140 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:57,345 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:57,345 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:57,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:57,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1648168292, now seen corresponding path program 1 times [2019-10-15 01:38:57,346 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:57,346 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43502751] [2019-10-15 01:38:57,347 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:57,347 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:57,347 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:57,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:57,507 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:57,508 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43502751] [2019-10-15 01:38:57,508 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831718287] [2019-10-15 01:38:57,508 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 01:38:57,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:57,557 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-15 01:38:57,559 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:57,747 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:57,747 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:57,825 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:57,825 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667870455] [2019-10-15 01:38:57,827 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:38:57,827 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:57,828 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:57,828 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:57,828 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:57,864 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:38:58,302 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:38:58,313 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:38:58,318 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:59,363 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:59,364 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 12] total 32 [2019-10-15 01:38:59,364 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [723044050] [2019-10-15 01:38:59,365 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-15 01:38:59,366 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:59,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-15 01:38:59,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=890, Unknown=0, NotChecked=0, Total=992 [2019-10-15 01:38:59,367 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 32 states. [2019-10-15 01:39:02,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:02,026 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2019-10-15 01:39:02,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-15 01:39:02,027 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 21 [2019-10-15 01:39:02,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:02,028 INFO L225 Difference]: With dead ends: 52 [2019-10-15 01:39:02,028 INFO L226 Difference]: Without dead ends: 50 [2019-10-15 01:39:02,031 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 885 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=385, Invalid=3037, Unknown=0, NotChecked=0, Total=3422 [2019-10-15 01:39:02,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-15 01:39:02,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2019-10-15 01:39:02,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-15 01:39:02,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2019-10-15 01:39:02,044 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 21 [2019-10-15 01:39:02,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:02,045 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2019-10-15 01:39:02,045 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-15 01:39:02,045 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2019-10-15 01:39:02,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 01:39:02,047 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:02,047 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:02,251 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:02,252 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:02,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:02,253 INFO L82 PathProgramCache]: Analyzing trace with hash -1209668182, now seen corresponding path program 2 times [2019-10-15 01:39:02,254 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:02,254 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018263771] [2019-10-15 01:39:02,254 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:02,255 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:02,255 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:02,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:02,407 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:39:02,407 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018263771] [2019-10-15 01:39:02,407 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [433453951] [2019-10-15 01:39:02,408 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 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 01:39:02,467 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:39:02,467 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:02,469 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-15 01:39:02,472 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:02,977 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:39:02,977 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:03,101 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:39:03,102 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1210746878] [2019-10-15 01:39:03,103 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:03,103 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:03,104 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:03,104 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:03,104 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:03,132 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:39:03,550 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:03,560 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:03,564 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:04,677 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:04,678 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 11, 12] total 37 [2019-10-15 01:39:04,678 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048658761] [2019-10-15 01:39:04,679 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-15 01:39:04,679 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:04,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-15 01:39:04,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1202, Unknown=0, NotChecked=0, Total=1332 [2019-10-15 01:39:04,681 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 37 states. [2019-10-15 01:39:05,738 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 64 [2019-10-15 01:39:06,561 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 64 [2019-10-15 01:39:06,805 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 58 [2019-10-15 01:39:07,053 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 63 [2019-10-15 01:39:07,640 WARN L191 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 64 [2019-10-15 01:39:08,190 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 64 [2019-10-15 01:39:08,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:08,333 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2019-10-15 01:39:08,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-10-15 01:39:08,333 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 22 [2019-10-15 01:39:08,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:08,335 INFO L225 Difference]: With dead ends: 57 [2019-10-15 01:39:08,335 INFO L226 Difference]: Without dead ends: 55 [2019-10-15 01:39:08,339 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 37 SyntacticMatches, 6 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1353 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=545, Invalid=4285, Unknown=0, NotChecked=0, Total=4830 [2019-10-15 01:39:08,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-15 01:39:08,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 29. [2019-10-15 01:39:08,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:39:08,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-15 01:39:08,350 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2019-10-15 01:39:08,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:08,350 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-15 01:39:08,350 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-15 01:39:08,350 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-15 01:39:08,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:39:08,351 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:08,351 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:08,562 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:08,563 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:08,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:08,563 INFO L82 PathProgramCache]: Analyzing trace with hash -145594472, now seen corresponding path program 3 times [2019-10-15 01:39:08,563 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:08,563 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644430708] [2019-10-15 01:39:08,564 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:08,564 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:08,564 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:08,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:08,625 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:08,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644430708] [2019-10-15 01:39:08,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323914615] [2019-10-15 01:39:08,626 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 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 01:39:08,690 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:39:08,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:08,691 INFO L256 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:39:08,694 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:08,738 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:08,739 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:08,768 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:08,769 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1275471270] [2019-10-15 01:39:08,770 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:08,770 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:08,771 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:08,771 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:08,771 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:08,833 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:39:09,210 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:09,220 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:09,224 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:10,051 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:10,052 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 8, 12] total 26 [2019-10-15 01:39:10,052 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1154132255] [2019-10-15 01:39:10,053 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 01:39:10,053 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:10,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 01:39:10,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=558, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:39:10,054 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 26 states. [2019-10-15 01:39:11,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:11,678 INFO L93 Difference]: Finished difference Result 58 states and 62 transitions. [2019-10-15 01:39:11,680 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-15 01:39:11,680 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2019-10-15 01:39:11,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:11,682 INFO L225 Difference]: With dead ends: 58 [2019-10-15 01:39:11,682 INFO L226 Difference]: Without dead ends: 34 [2019-10-15 01:39:11,684 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 60 SyntacticMatches, 7 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 765 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=354, Invalid=2096, Unknown=0, NotChecked=0, Total=2450 [2019-10-15 01:39:11,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-15 01:39:11,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2019-10-15 01:39:11,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 01:39:11,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-10-15 01:39:11,699 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2019-10-15 01:39:11,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:11,700 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-10-15 01:39:11,700 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 01:39:11,700 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-10-15 01:39:11,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:39:11,701 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:11,701 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:11,913 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:11,913 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:11,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:11,914 INFO L82 PathProgramCache]: Analyzing trace with hash 138379466, now seen corresponding path program 4 times [2019-10-15 01:39:11,914 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:11,914 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108889571] [2019-10-15 01:39:11,914 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:11,914 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:11,914 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:11,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:12,057 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:12,058 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108889571] [2019-10-15 01:39:12,058 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783030058] [2019-10-15 01:39:12,058 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 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 01:39:12,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:12,139 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-15 01:39:12,141 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:12,393 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:39:12,393 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:12,467 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:12,468 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [258555625] [2019-10-15 01:39:12,469 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:12,469 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:12,470 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:12,470 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:12,470 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:12,498 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:39:12,797 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:12,805 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:12,809 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:13,912 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:13,912 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 15, 12, 12] total 35 [2019-10-15 01:39:13,912 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566216269] [2019-10-15 01:39:13,913 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-15 01:39:13,913 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:13,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-15 01:39:13,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1077, Unknown=0, NotChecked=0, Total=1190 [2019-10-15 01:39:13,914 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 35 states. [2019-10-15 01:39:16,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:16,990 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2019-10-15 01:39:16,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2019-10-15 01:39:16,991 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 29 [2019-10-15 01:39:16,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:16,993 INFO L225 Difference]: With dead ends: 63 [2019-10-15 01:39:16,993 INFO L226 Difference]: Without dead ends: 61 [2019-10-15 01:39:16,995 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 55 SyntacticMatches, 11 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=469, Invalid=4087, Unknown=0, NotChecked=0, Total=4556 [2019-10-15 01:39:16,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-10-15 01:39:17,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 52. [2019-10-15 01:39:17,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-15 01:39:17,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2019-10-15 01:39:17,012 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 29 [2019-10-15 01:39:17,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:17,012 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2019-10-15 01:39:17,013 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-15 01:39:17,013 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2019-10-15 01:39:17,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 01:39:17,014 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:17,014 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:17,215 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:17,216 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:17,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:17,217 INFO L82 PathProgramCache]: Analyzing trace with hash 351636952, now seen corresponding path program 5 times [2019-10-15 01:39:17,217 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:17,217 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328461147] [2019-10-15 01:39:17,221 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:17,222 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:17,222 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:17,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:17,415 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:17,416 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328461147] [2019-10-15 01:39:17,416 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [512069851] [2019-10-15 01:39:17,416 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:17,521 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:39:17,521 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:17,522 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-15 01:39:17,527 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:18,195 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 3 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:39:18,195 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:18,321 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 17 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:18,322 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1931673296] [2019-10-15 01:39:18,323 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:18,324 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:18,324 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:18,325 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:18,325 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:18,353 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:39:18,775 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:18,785 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:18,789 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:19,984 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:19,985 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 13, 12] total 41 [2019-10-15 01:39:19,985 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484784180] [2019-10-15 01:39:19,986 INFO L442 AbstractCegarLoop]: Interpolant automaton has 41 states [2019-10-15 01:39:19,986 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:19,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2019-10-15 01:39:19,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1494, Unknown=0, NotChecked=0, Total=1640 [2019-10-15 01:39:19,987 INFO L87 Difference]: Start difference. First operand 52 states and 58 transitions. Second operand 41 states. [2019-10-15 01:39:20,709 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 61 [2019-10-15 01:39:21,048 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 61 [2019-10-15 01:39:21,347 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 65 [2019-10-15 01:39:22,351 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 65 [2019-10-15 01:39:22,613 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 61 [2019-10-15 01:39:22,886 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 65 [2019-10-15 01:39:23,232 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 65 [2019-10-15 01:39:23,520 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 61 [2019-10-15 01:39:23,775 WARN L191 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 64 [2019-10-15 01:39:24,614 WARN L191 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 65 [2019-10-15 01:39:25,266 WARN L191 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 65 [2019-10-15 01:39:25,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:25,389 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2019-10-15 01:39:25,389 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-15 01:39:25,389 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 30 [2019-10-15 01:39:25,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:25,391 INFO L225 Difference]: With dead ends: 68 [2019-10-15 01:39:25,391 INFO L226 Difference]: Without dead ends: 66 [2019-10-15 01:39:25,394 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 55 SyntacticMatches, 10 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1889 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=681, Invalid=5799, Unknown=0, NotChecked=0, Total=6480 [2019-10-15 01:39:25,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-15 01:39:25,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 33. [2019-10-15 01:39:25,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:39:25,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-10-15 01:39:25,406 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 30 [2019-10-15 01:39:25,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:25,407 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-10-15 01:39:25,407 INFO L463 AbstractCegarLoop]: Interpolant automaton has 41 states. [2019-10-15 01:39:25,407 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-10-15 01:39:25,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 01:39:25,408 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:25,408 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:25,609 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:25,610 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:25,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:25,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1699731030, now seen corresponding path program 6 times [2019-10-15 01:39:25,611 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:25,611 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668121781] [2019-10-15 01:39:25,611 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:25,612 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:25,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:25,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:25,698 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:25,698 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668121781] [2019-10-15 01:39:25,698 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820205276] [2019-10-15 01:39:25,699 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:25,800 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:39:25,800 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:25,801 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:39:25,803 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:25,888 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:25,889 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:25,960 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:25,961 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1737006179] [2019-10-15 01:39:25,962 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:25,962 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:25,963 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:25,963 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:25,963 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:26,003 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:39:26,343 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:26,352 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:26,357 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:26,878 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 23 [2019-10-15 01:39:27,307 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:27,307 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10, 12] total 30 [2019-10-15 01:39:27,307 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336292383] [2019-10-15 01:39:27,308 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-15 01:39:27,308 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:27,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-15 01:39:27,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=738, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:39:27,309 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 30 states.