/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/loop-lit/gj2007.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 04:01:47,087 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 04:01:47,090 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 04:01:47,102 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 04:01:47,102 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 04:01:47,103 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 04:01:47,105 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 04:01:47,106 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 04:01:47,108 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 04:01:47,109 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 04:01:47,110 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 04:01:47,111 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 04:01:47,112 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 04:01:47,113 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 04:01:47,114 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 04:01:47,115 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 04:01:47,115 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 04:01:47,116 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 04:01:47,118 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 04:01:47,120 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 04:01:47,121 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 04:01:47,123 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 04:01:47,124 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 04:01:47,124 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 04:01:47,127 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 04:01:47,127 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 04:01:47,127 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 04:01:47,128 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 04:01:47,129 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 04:01:47,129 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 04:01:47,130 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 04:01:47,130 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 04:01:47,131 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 04:01:47,132 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 04:01:47,133 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 04:01:47,133 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 04:01:47,134 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 04:01:47,134 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 04:01:47,135 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 04:01:47,136 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 04:01:47,136 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 04:01:47,137 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 [2019-11-07 04:01:47,155 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 04:01:47,155 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 04:01:47,157 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 04:01:47,157 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 04:01:47,157 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 04:01:47,157 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 04:01:47,158 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 04:01:47,158 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 04:01:47,158 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 04:01:47,158 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 04:01:47,158 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 04:01:47,159 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 04:01:47,159 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 04:01:47,160 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 04:01:47,160 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 04:01:47,160 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 04:01:47,160 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 04:01:47,161 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 04:01:47,161 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 04:01:47,161 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 04:01:47,161 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 04:01:47,161 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:01:47,161 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 04:01:47,162 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 04:01:47,162 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 04:01:47,163 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 04:01:47,163 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 04:01:47,163 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 04:01:47,163 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 [2019-11-07 04:01:47,447 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 04:01:47,467 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 04:01:47,471 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 04:01:47,472 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 04:01:47,473 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 04:01:47,474 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gj2007.i [2019-11-07 04:01:47,550 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e111c9f9/b549e0eeb92b478b84d34250565be00d/FLAGb7daf7fa1 [2019-11-07 04:01:47,983 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 04:01:47,985 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/gj2007.i [2019-11-07 04:01:47,992 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e111c9f9/b549e0eeb92b478b84d34250565be00d/FLAGb7daf7fa1 [2019-11-07 04:01:48,380 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2e111c9f9/b549e0eeb92b478b84d34250565be00d [2019-11-07 04:01:48,390 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 04:01:48,392 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 04:01:48,393 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 04:01:48,393 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 04:01:48,396 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 04:01:48,397 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,400 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@529b5f14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48, skipping insertion in model container [2019-11-07 04:01:48,400 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,408 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 04:01:48,424 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 04:01:48,570 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:01:48,575 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 04:01:48,590 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 04:01:48,604 INFO L192 MainTranslator]: Completed translation [2019-11-07 04:01:48,605 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48 WrapperNode [2019-11-07 04:01:48,605 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 04:01:48,606 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 04:01:48,606 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 04:01:48,606 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 04:01:48,699 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,699 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,704 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,704 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,708 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,713 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,714 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... [2019-11-07 04:01:48,715 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 04:01:48,716 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 04:01:48,716 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 04:01:48,716 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 04:01:48,717 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 04:01:48,771 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 04:01:48,771 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 04:01:48,771 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 04:01:48,771 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 04:01:48,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 04:01:48,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-07 04:01:48,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 04:01:48,772 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 04:01:48,772 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 04:01:48,773 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 04:01:48,773 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 04:01:48,970 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 04:01:48,970 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 04:01:48,972 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:01:48 BoogieIcfgContainer [2019-11-07 04:01:48,972 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 04:01:48,973 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 04:01:48,973 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 04:01:48,976 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 04:01:48,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:01:48" (1/3) ... [2019-11-07 04:01:48,977 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18f5590 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:01:48, skipping insertion in model container [2019-11-07 04:01:48,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:01:48" (2/3) ... [2019-11-07 04:01:48,978 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18f5590 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:01:48, skipping insertion in model container [2019-11-07 04:01:48,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:01:48" (3/3) ... [2019-11-07 04:01:48,980 INFO L109 eAbstractionObserver]: Analyzing ICFG gj2007.i [2019-11-07 04:01:48,990 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 04:01:48,999 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 04:01:49,011 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 04:01:49,065 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 04:01:49,066 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 04:01:49,066 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 04:01:49,066 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 04:01:49,066 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 04:01:49,066 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 04:01:49,066 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 04:01:49,070 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 04:01:49,095 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-11-07 04:01:49,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-07 04:01:49,101 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:01:49,102 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:01:49,104 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:01:49,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:01:49,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1733570904, now seen corresponding path program 1 times [2019-11-07 04:01:49,122 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:01:49,122 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777326878] [2019-11-07 04:01:49,123 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:01:49,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:49,256 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:49,257 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777326878] [2019-11-07 04:01:49,258 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 04:01:49,258 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 04:01:49,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748161285] [2019-11-07 04:01:49,265 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 04:01:49,266 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:01:49,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 04:01:49,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 04:01:49,282 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-11-07 04:01:49,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:01:49,333 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2019-11-07 04:01:49,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 04:01:49,335 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2019-11-07 04:01:49,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:01:49,351 INFO L225 Difference]: With dead ends: 29 [2019-11-07 04:01:49,351 INFO L226 Difference]: Without dead ends: 12 [2019-11-07 04:01:49,356 INFO L630 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 [2019-11-07 04:01:49,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-11-07 04:01:49,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-11-07 04:01:49,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-11-07 04:01:49,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-11-07 04:01:49,397 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-11-07 04:01:49,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:01:49,398 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-11-07 04:01:49,398 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 04:01:49,398 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-11-07 04:01:49,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 04:01:49,399 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:01:49,399 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:01:49,399 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:01:49,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:01:49,400 INFO L82 PathProgramCache]: Analyzing trace with hash -2033404008, now seen corresponding path program 1 times [2019-11-07 04:01:49,400 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:01:49,401 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575240917] [2019-11-07 04:01:49,401 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:01:49,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:49,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:49,455 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575240917] [2019-11-07 04:01:49,455 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [311063014] [2019-11-07 04:01:49,455 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 [2019-11-07 04:01:49,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:49,489 INFO L256 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 04:01:49,494 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:01:49,515 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:01:49,545 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:49,546 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:01:49,565 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-07 04:01:49,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:49,604 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1914138163] [2019-11-07 04:01:49,636 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-07 04:01:49,636 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:01:49,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:01:49,668 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:01:49,669 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:01:49,719 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:01:49,891 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 04:01:49,897 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:01:49,899 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:01:50,047 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:01:50,048 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 6] total 11 [2019-11-07 04:01:50,049 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184913716] [2019-11-07 04:01:50,050 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-07 04:01:50,051 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:01:50,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-07 04:01:50,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2019-11-07 04:01:50,051 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 11 states. [2019-11-07 04:01:50,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:01:50,190 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2019-11-07 04:01:50,190 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-07 04:01:50,191 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 11 [2019-11-07 04:01:50,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:01:50,192 INFO L225 Difference]: With dead ends: 20 [2019-11-07 04:01:50,192 INFO L226 Difference]: Without dead ends: 15 [2019-11-07 04:01:50,194 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=153, Unknown=0, NotChecked=0, Total=210 [2019-11-07 04:01:50,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-11-07 04:01:50,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-11-07 04:01:50,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-11-07 04:01:50,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-11-07 04:01:50,208 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2019-11-07 04:01:50,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:01:50,208 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-11-07 04:01:50,208 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-07 04:01:50,209 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-11-07 04:01:50,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 04:01:50,209 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:01:50,210 INFO L410 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:01:50,414 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:50,415 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:01:50,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:01:50,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1000095400, now seen corresponding path program 2 times [2019-11-07 04:01:50,416 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:01:50,417 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [915573390] [2019-11-07 04:01:50,417 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:01:50,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:50,505 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:50,506 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [915573390] [2019-11-07 04:01:50,506 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015344208] [2019-11-07 04:01:50,507 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 [2019-11-07 04:01:50,535 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 04:01:50,536 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:01:50,536 INFO L256 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 04:01:50,554 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:01:50,612 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:50,613 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:01:50,765 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:50,765 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1287676838] [2019-11-07 04:01:50,767 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-07 04:01:50,767 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:01:50,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:01:50,768 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:01:50,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:01:50,779 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:01:50,878 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 04:01:50,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:01:50,886 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:01:50,964 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:01:50,964 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 6] total 17 [2019-11-07 04:01:50,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [791949068] [2019-11-07 04:01:50,965 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-07 04:01:50,966 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:01:50,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-07 04:01:50,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=192, Unknown=0, NotChecked=0, Total=272 [2019-11-07 04:01:50,969 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 17 states. [2019-11-07 04:01:51,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:01:51,203 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2019-11-07 04:01:51,203 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-07 04:01:51,204 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 14 [2019-11-07 04:01:51,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:01:51,204 INFO L225 Difference]: With dead ends: 26 [2019-11-07 04:01:51,206 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 04:01:51,207 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 29 SyntacticMatches, 4 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 134 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=210, Invalid=492, Unknown=0, NotChecked=0, Total=702 [2019-11-07 04:01:51,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 04:01:51,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 04:01:51,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 04:01:51,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2019-11-07 04:01:51,216 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2019-11-07 04:01:51,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:01:51,216 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2019-11-07 04:01:51,216 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-07 04:01:51,216 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2019-11-07 04:01:51,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-07 04:01:51,218 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:01:51,219 INFO L410 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:01:51,419 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:51,419 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:01:51,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:01:51,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1156847960, now seen corresponding path program 3 times [2019-11-07 04:01:51,420 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:01:51,420 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394745918] [2019-11-07 04:01:51,421 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:01:51,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:51,578 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:51,578 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394745918] [2019-11-07 04:01:51,579 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695703007] [2019-11-07 04:01:51,579 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:51,624 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:01:51,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:01:51,625 INFO L256 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 04:01:51,629 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:01:51,779 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:51,780 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:01:52,111 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:52,112 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641621317] [2019-11-07 04:01:52,115 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-07 04:01:52,115 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:01:52,117 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:01:52,117 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:01:52,117 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:01:52,135 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:01:52,188 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 04:01:52,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:01:52,197 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:01:52,278 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:01:52,278 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 6] total 29 [2019-11-07 04:01:52,279 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490681615] [2019-11-07 04:01:52,280 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 04:01:52,280 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:01:52,280 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 04:01:52,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=522, Unknown=0, NotChecked=0, Total=812 [2019-11-07 04:01:52,281 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 29 states. [2019-11-07 04:01:52,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:01:52,803 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2019-11-07 04:01:52,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-07 04:01:52,804 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 20 [2019-11-07 04:01:52,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:01:52,805 INFO L225 Difference]: With dead ends: 38 [2019-11-07 04:01:52,805 INFO L226 Difference]: Without dead ends: 33 [2019-11-07 04:01:52,807 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 35 SyntacticMatches, 10 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 500 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=840, Invalid=1710, Unknown=0, NotChecked=0, Total=2550 [2019-11-07 04:01:52,807 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-11-07 04:01:52,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-11-07 04:01:52,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-07 04:01:52,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2019-11-07 04:01:52,814 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2019-11-07 04:01:52,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:01:52,815 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2019-11-07 04:01:52,815 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 04:01:52,815 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2019-11-07 04:01:52,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 04:01:52,816 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:01:52,816 INFO L410 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:01:53,019 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:53,020 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:01:53,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:01:53,021 INFO L82 PathProgramCache]: Analyzing trace with hash 1890503000, now seen corresponding path program 4 times [2019-11-07 04:01:53,021 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:01:53,022 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129820676] [2019-11-07 04:01:53,022 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:01:53,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:53,415 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:53,416 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129820676] [2019-11-07 04:01:53,416 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1277520823] [2019-11-07 04:01:53,416 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:53,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:53,465 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 04:01:53,468 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:01:53,857 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:53,857 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:01:54,904 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:54,904 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1385198220] [2019-11-07 04:01:54,906 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-07 04:01:54,906 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:01:54,906 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:01:54,906 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:01:54,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:01:54,914 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:01:54,967 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 04:01:54,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:01:54,973 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:01:55,095 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:01:55,096 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 6] total 53 [2019-11-07 04:01:55,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913058140] [2019-11-07 04:01:55,098 INFO L442 AbstractCegarLoop]: Interpolant automaton has 53 states [2019-11-07 04:01:55,098 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:01:55,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2019-11-07 04:01:55,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1142, Invalid=1614, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 04:01:55,101 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 53 states. [2019-11-07 04:01:56,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:01:56,704 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2019-11-07 04:01:56,705 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2019-11-07 04:01:56,705 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 32 [2019-11-07 04:01:56,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:01:56,707 INFO L225 Difference]: With dead ends: 62 [2019-11-07 04:01:56,707 INFO L226 Difference]: Without dead ends: 57 [2019-11-07 04:01:56,710 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 47 SyntacticMatches, 22 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1880 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3396, Invalid=6306, Unknown=0, NotChecked=0, Total=9702 [2019-11-07 04:01:56,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-11-07 04:01:56,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2019-11-07 04:01:56,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-11-07 04:01:56,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2019-11-07 04:01:56,720 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2019-11-07 04:01:56,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:01:56,721 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2019-11-07 04:01:56,721 INFO L463 AbstractCegarLoop]: Interpolant automaton has 53 states. [2019-11-07 04:01:56,721 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2019-11-07 04:01:56,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-07 04:01:56,722 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:01:56,723 INFO L410 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:01:56,926 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:56,927 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:01:56,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:01:56,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1015818584, now seen corresponding path program 5 times [2019-11-07 04:01:56,927 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:01:56,927 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1783034917] [2019-11-07 04:01:56,927 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:01:56,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:01:58,043 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:58,044 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1783034917] [2019-11-07 04:01:58,044 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503053387] [2019-11-07 04:01:58,044 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:01:58,141 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2019-11-07 04:01:58,141 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:01:58,143 INFO L256 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 48 conjunts are in the unsatisfiable core [2019-11-07 04:01:58,147 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:01:59,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:01:59,400 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:03,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:03,365 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634970283] [2019-11-07 04:02:03,366 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-07 04:02:03,366 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:03,366 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:03,367 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:03,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:03,374 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:02:03,420 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 04:02:03,424 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:02:03,425 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:03,575 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:03,575 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 6] total 101 [2019-11-07 04:02:03,576 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [552929989] [2019-11-07 04:02:03,577 INFO L442 AbstractCegarLoop]: Interpolant automaton has 101 states [2019-11-07 04:02:03,578 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:03,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2019-11-07 04:02:03,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4574, Invalid=5526, Unknown=0, NotChecked=0, Total=10100 [2019-11-07 04:02:03,582 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 101 states. [2019-11-07 04:02:08,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 04:02:08,674 INFO L93 Difference]: Finished difference Result 110 states and 157 transitions. [2019-11-07 04:02:08,674 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 101 states. [2019-11-07 04:02:08,674 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 56 [2019-11-07 04:02:08,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 04:02:08,677 INFO L225 Difference]: With dead ends: 110 [2019-11-07 04:02:08,677 INFO L226 Difference]: Without dead ends: 105 [2019-11-07 04:02:08,686 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 71 SyntacticMatches, 46 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7232 ImplicationChecksByTransitivity, 10.8s TimeCoverageRelationStatistics Valid=13692, Invalid=24138, Unknown=0, NotChecked=0, Total=37830 [2019-11-07 04:02:08,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2019-11-07 04:02:08,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2019-11-07 04:02:08,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2019-11-07 04:02:08,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2019-11-07 04:02:08,700 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 56 [2019-11-07 04:02:08,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 04:02:08,701 INFO L462 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2019-11-07 04:02:08,701 INFO L463 AbstractCegarLoop]: Interpolant automaton has 101 states. [2019-11-07 04:02:08,701 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2019-11-07 04:02:08,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-11-07 04:02:08,704 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 04:02:08,704 INFO L410 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 04:02:08,908 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 04:02:08,909 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 04:02:08,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 04:02:08,909 INFO L82 PathProgramCache]: Analyzing trace with hash -169416360, now seen corresponding path program 6 times [2019-11-07 04:02:08,909 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 04:02:08,909 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585971739] [2019-11-07 04:02:08,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 04:02:09,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 04:02:13,706 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:13,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585971739] [2019-11-07 04:02:13,707 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607434753] [2019-11-07 04:02:13,707 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 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 [2019-11-07 04:02:13,806 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 04:02:13,806 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 04:02:13,809 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 97 conjunts are in the unsatisfiable core [2019-11-07 04:02:13,833 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 04:02:18,465 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:18,466 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 04:02:30,126 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 04:02:30,127 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269522979] [2019-11-07 04:02:30,130 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-11-07 04:02:30,130 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 04:02:30,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 04:02:30,131 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 04:02:30,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 04:02:30,137 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-11-07 04:02:30,178 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 04:02:30,188 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-11-07 04:02:30,190 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 04:02:30,794 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 04:02:30,794 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97, 6] total 197 [2019-11-07 04:02:30,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707729338] [2019-11-07 04:02:30,795 INFO L442 AbstractCegarLoop]: Interpolant automaton has 197 states [2019-11-07 04:02:30,796 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 04:02:30,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2019-11-07 04:02:30,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9880, Invalid=28732, Unknown=0, NotChecked=0, Total=38612 [2019-11-07 04:02:30,832 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 197 states.