/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/eca-rers2012/Problem12_label36.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:55:20,130 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-07 01:55:20,133 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-07 01:55:20,150 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-07 01:55:20,150 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-07 01:55:20,151 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-07 01:55:20,153 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-07 01:55:20,164 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-07 01:55:20,166 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-07 01:55:20,166 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-07 01:55:20,167 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-07 01:55:20,168 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-07 01:55:20,169 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:55:20,170 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:55:20,171 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:55:20,172 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:55:20,173 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:55:20,173 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:55:20,175 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:55:20,177 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:55:20,178 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:55:20,179 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:55:20,180 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:55:20,181 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:55:20,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-07 01:55:20,183 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-07 01:55:20,187 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-07 01:55:20,188 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-07 01:55:20,188 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-07 01:55:20,189 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-07 01:55:20,189 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-07 01:55:20,192 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-07 01:55:20,193 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-07 01:55:20,194 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-07 01:55:20,198 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-07 01:55:20,198 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-07 01:55:20,199 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-07 01:55:20,200 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-07 01:55:20,200 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:55:20,201 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:55:20,201 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:55:20,202 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 01:55:20,220 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:55:20,220 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:55:20,221 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:55:20,221 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:55:20,222 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:55:20,222 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:55:20,222 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:55:20,222 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:55:20,223 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:55:20,223 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:55:20,223 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:55:20,223 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:55:20,223 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:55:20,224 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:55:20,224 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:55:20,224 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:55:20,224 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:55:20,224 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:55:20,225 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:55:20,225 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:55:20,225 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:55:20,225 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:55:20,226 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:55:20,226 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:55:20,226 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:55:20,226 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:55:20,226 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:55:20,227 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:55:20,227 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 01:55:20,545 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:55:20,557 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:55:20,561 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:55:20,562 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:55:20,562 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:55:20,563 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem12_label36.c [2019-11-07 01:55:20,631 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24fa87719/3300dcd1ea57487b891ebe8cc8251e31/FLAG0aad4545f [2019-11-07 01:55:21,377 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:55:21,378 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem12_label36.c [2019-11-07 01:55:21,404 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24fa87719/3300dcd1ea57487b891ebe8cc8251e31/FLAG0aad4545f [2019-11-07 01:55:21,530 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/24fa87719/3300dcd1ea57487b891ebe8cc8251e31 [2019-11-07 01:55:21,542 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:55:21,544 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:55:21,546 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:55:21,546 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:55:21,550 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:55:21,551 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:55:21" (1/1) ... [2019-11-07 01:55:21,554 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@390fcaf5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:21, skipping insertion in model container [2019-11-07 01:55:21,554 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:55:21" (1/1) ... [2019-11-07 01:55:21,563 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:55:21,706 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:55:23,022 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:55:23,038 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:55:23,810 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:55:23,840 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:55:23,841 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23 WrapperNode [2019-11-07 01:55:23,841 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:55:23,842 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:55:23,842 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:55:23,842 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:55:23,857 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:23,857 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:23,911 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:23,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:24,030 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:24,063 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:24,092 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (1/1) ... [2019-11-07 01:55:24,135 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:55:24,137 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:55:24,137 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:55:24,137 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:55:24,138 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (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 01:55:24,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:55:24,221 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:55:24,221 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-07 01:55:24,222 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-11-07 01:55:24,222 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-11-07 01:55:24,223 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output4 [2019-11-07 01:55:24,224 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:55:24,224 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-07 01:55:24,224 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-11-07 01:55:24,224 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-11-07 01:55:24,225 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output4 [2019-11-07 01:55:24,226 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:55:24,226 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:55:24,227 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-07 01:55:24,227 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:55:24,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:55:24,230 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:55:31,182 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:55:31,182 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-07 01:55:31,186 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:55:31 BoogieIcfgContainer [2019-11-07 01:55:31,186 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:55:31,187 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:55:31,187 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:55:31,190 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:55:31,191 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:55:21" (1/3) ... [2019-11-07 01:55:31,192 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27ac8d11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:55:31, skipping insertion in model container [2019-11-07 01:55:31,192 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:55:23" (2/3) ... [2019-11-07 01:55:31,192 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@27ac8d11 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:55:31, skipping insertion in model container [2019-11-07 01:55:31,192 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:55:31" (3/3) ... [2019-11-07 01:55:31,195 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem12_label36.c [2019-11-07 01:55:31,205 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:55:31,214 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:55:31,226 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:55:31,257 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:55:31,258 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:55:31,258 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:55:31,258 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:55:31,258 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:55:31,258 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:55:31,259 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:55:31,259 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:55:31,303 INFO L276 IsEmpty]: Start isEmpty. Operand 694 states. [2019-11-07 01:55:31,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-11-07 01:55:31,309 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:55:31,310 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:55:31,315 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:55:31,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:55:31,321 INFO L82 PathProgramCache]: Analyzing trace with hash -874905522, now seen corresponding path program 1 times [2019-11-07 01:55:31,331 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:55:31,332 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1854745511] [2019-11-07 01:55:31,332 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:55:31,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:55:31,600 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 01:55:31,602 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1854745511] [2019-11-07 01:55:31,603 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:55:31,604 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:55:31,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987810641] [2019-11-07 01:55:31,613 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:55:31,613 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:55:31,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:55:31,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:55:31,632 INFO L87 Difference]: Start difference. First operand 694 states. Second operand 3 states. [2019-11-07 01:55:36,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:55:36,546 INFO L93 Difference]: Finished difference Result 2068 states and 4065 transitions. [2019-11-07 01:55:36,548 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:55:36,549 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-11-07 01:55:36,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:55:36,583 INFO L225 Difference]: With dead ends: 2068 [2019-11-07 01:55:36,583 INFO L226 Difference]: Without dead ends: 1371 [2019-11-07 01:55:36,595 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:55:36,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1371 states. [2019-11-07 01:55:36,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1371 to 1365. [2019-11-07 01:55:36,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1365 states. [2019-11-07 01:55:36,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1365 states to 1365 states and 2477 transitions. [2019-11-07 01:55:36,746 INFO L78 Accepts]: Start accepts. Automaton has 1365 states and 2477 transitions. Word has length 11 [2019-11-07 01:55:36,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:55:36,746 INFO L462 AbstractCegarLoop]: Abstraction has 1365 states and 2477 transitions. [2019-11-07 01:55:36,746 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:55:36,747 INFO L276 IsEmpty]: Start isEmpty. Operand 1365 states and 2477 transitions. [2019-11-07 01:55:36,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-07 01:55:36,749 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:55:36,749 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:55:36,750 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:55:36,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:55:36,750 INFO L82 PathProgramCache]: Analyzing trace with hash -792374107, now seen corresponding path program 1 times [2019-11-07 01:55:36,750 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:55:36,751 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286716686] [2019-11-07 01:55:36,751 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:55:36,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:55:36,916 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:55:36,916 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286716686] [2019-11-07 01:55:36,917 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1697976995] [2019-11-07 01:55:36,917 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 01:55:37,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:55:37,028 INFO L256 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:55:37,039 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:55:37,102 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:55:37,103 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:55:37,142 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:55:37,143 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-07 01:55:37,143 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [7] total 8 [2019-11-07 01:55:37,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830784749] [2019-11-07 01:55:37,145 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:55:37,145 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:55:37,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:55:37,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-11-07 01:55:37,146 INFO L87 Difference]: Start difference. First operand 1365 states and 2477 transitions. Second operand 3 states. [2019-11-07 01:55:42,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:55:42,851 INFO L93 Difference]: Finished difference Result 4081 states and 7455 transitions. [2019-11-07 01:55:42,857 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:55:42,857 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2019-11-07 01:55:42,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:55:42,887 INFO L225 Difference]: With dead ends: 4081 [2019-11-07 01:55:42,887 INFO L226 Difference]: Without dead ends: 2721 [2019-11-07 01:55:42,896 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 55 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-11-07 01:55:42,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2721 states. [2019-11-07 01:55:43,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2721 to 2718. [2019-11-07 01:55:43,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2718 states. [2019-11-07 01:55:43,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2718 states to 2718 states and 4631 transitions. [2019-11-07 01:55:43,030 INFO L78 Accepts]: Start accepts. Automaton has 2718 states and 4631 transitions. Word has length 27 [2019-11-07 01:55:43,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:55:43,031 INFO L462 AbstractCegarLoop]: Abstraction has 2718 states and 4631 transitions. [2019-11-07 01:55:43,032 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:55:43,032 INFO L276 IsEmpty]: Start isEmpty. Operand 2718 states and 4631 transitions. [2019-11-07 01:55:43,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-07 01:55:43,037 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:55:43,037 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:55:43,241 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:55:43,242 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:55:43,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:55:43,243 INFO L82 PathProgramCache]: Analyzing trace with hash 846430429, now seen corresponding path program 1 times [2019-11-07 01:55:43,247 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:55:43,247 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384827050] [2019-11-07 01:55:43,247 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:55:43,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:55:43,410 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:55:43,411 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384827050] [2019-11-07 01:55:43,411 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:55:43,411 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:55:43,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880378276] [2019-11-07 01:55:43,412 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:55:43,412 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:55:43,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:55:43,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:55:43,414 INFO L87 Difference]: Start difference. First operand 2718 states and 4631 transitions. Second operand 5 states. [2019-11-07 01:55:49,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:55:49,976 INFO L93 Difference]: Finished difference Result 8254 states and 14243 transitions. [2019-11-07 01:55:49,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-07 01:55:49,977 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2019-11-07 01:55:49,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:55:50,006 INFO L225 Difference]: With dead ends: 8254 [2019-11-07 01:55:50,007 INFO L226 Difference]: Without dead ends: 5541 [2019-11-07 01:55:50,013 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-07 01:55:50,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5541 states. [2019-11-07 01:55:50,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5541 to 5489. [2019-11-07 01:55:50,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5489 states. [2019-11-07 01:55:50,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5489 states to 5489 states and 8544 transitions. [2019-11-07 01:55:50,156 INFO L78 Accepts]: Start accepts. Automaton has 5489 states and 8544 transitions. Word has length 31 [2019-11-07 01:55:50,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:55:50,157 INFO L462 AbstractCegarLoop]: Abstraction has 5489 states and 8544 transitions. [2019-11-07 01:55:50,157 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:55:50,157 INFO L276 IsEmpty]: Start isEmpty. Operand 5489 states and 8544 transitions. [2019-11-07 01:55:50,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-11-07 01:55:50,159 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:55:50,159 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:55:50,160 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:55:50,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:55:50,160 INFO L82 PathProgramCache]: Analyzing trace with hash 1979349910, now seen corresponding path program 1 times [2019-11-07 01:55:50,160 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:55:50,161 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [920473802] [2019-11-07 01:55:50,161 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:55:50,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:55:50,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:55:50,232 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [920473802] [2019-11-07 01:55:50,232 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:55:50,232 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-07 01:55:50,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786694194] [2019-11-07 01:55:50,233 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-07 01:55:50,233 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:55:50,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-07 01:55:50,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-07 01:55:50,234 INFO L87 Difference]: Start difference. First operand 5489 states and 8544 transitions. Second operand 5 states. [2019-11-07 01:55:56,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:55:56,830 INFO L93 Difference]: Finished difference Result 16766 states and 27181 transitions. [2019-11-07 01:55:56,830 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-07 01:55:56,830 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 42 [2019-11-07 01:55:56,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:55:56,883 INFO L225 Difference]: With dead ends: 16766 [2019-11-07 01:55:56,884 INFO L226 Difference]: Without dead ends: 11282 [2019-11-07 01:55:56,900 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:55:56,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11282 states. [2019-11-07 01:55:57,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11282 to 10967. [2019-11-07 01:55:57,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10967 states. [2019-11-07 01:55:57,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10967 states to 10967 states and 15882 transitions. [2019-11-07 01:55:57,293 INFO L78 Accepts]: Start accepts. Automaton has 10967 states and 15882 transitions. Word has length 42 [2019-11-07 01:55:57,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:55:57,293 INFO L462 AbstractCegarLoop]: Abstraction has 10967 states and 15882 transitions. [2019-11-07 01:55:57,294 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-07 01:55:57,294 INFO L276 IsEmpty]: Start isEmpty. Operand 10967 states and 15882 transitions. [2019-11-07 01:55:57,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-07 01:55:57,304 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:55:57,304 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:55:57,305 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:55:57,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:55:57,305 INFO L82 PathProgramCache]: Analyzing trace with hash 1259242681, now seen corresponding path program 1 times [2019-11-07 01:55:57,305 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:55:57,306 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758920698] [2019-11-07 01:55:57,306 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:55:57,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:55:57,494 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:55:57,495 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758920698] [2019-11-07 01:55:57,495 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:55:57,495 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-07 01:55:57,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905717666] [2019-11-07 01:55:57,496 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-07 01:55:57,496 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:55:57,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-07 01:55:57,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-07 01:55:57,498 INFO L87 Difference]: Start difference. First operand 10967 states and 15882 transitions. Second operand 6 states.