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/Problem15_label49.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:55:09,451 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:55:09,454 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:55:09,472 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:55:09,497 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:55:09,500 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:55:09,501 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:55:09,502 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:55:09,503 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:55:09,503 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:55:09,505 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:55:09,507 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:55:09,508 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:55:09,509 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:55:09,510 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:55:09,511 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:55:09,513 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:55:09,520 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:55:09,521 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:55:09,522 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:55:09,523 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 01:55:09,539 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:55:09,540 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:55:09,543 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:55:09,543 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:55:09,543 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:55:09,544 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:55:09,544 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:55:09,544 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:55:09,545 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:55:09,545 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:55:09,546 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:55:09,546 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:55:09,546 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:55:09,547 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:55:09,547 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:55:09,547 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:55:09,547 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:55:09,548 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:55:09,548 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:55:09,548 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:55:09,548 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:55:09,549 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:55:09,549 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:55:09,549 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:55:09,549 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:55:09,549 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:55:09,550 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:55:09,550 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:55:09,550 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 01:55:09,817 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:55:09,830 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:55:09,833 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:55:09,834 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:55:09,835 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:55:09,836 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem15_label49.c [2019-10-15 01:55:09,894 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cd5323a8/d1357a3a6c20485996f0e936ba7eb26d/FLAG81e2874ac [2019-10-15 01:55:10,599 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:55:10,602 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem15_label49.c [2019-10-15 01:55:10,625 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cd5323a8/d1357a3a6c20485996f0e936ba7eb26d/FLAG81e2874ac [2019-10-15 01:55:10,794 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cd5323a8/d1357a3a6c20485996f0e936ba7eb26d [2019-10-15 01:55:10,805 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:55:10,806 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:55:10,810 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:55:10,810 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:55:10,813 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:55:10,814 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:55:10" (1/1) ... [2019-10-15 01:55:10,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@248c9b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:10, skipping insertion in model container [2019-10-15 01:55:10,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:55:10" (1/1) ... [2019-10-15 01:55:10,826 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:55:10,905 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:55:11,721 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:55:11,736 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:55:12,173 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:55:12,195 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:55:12,196 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12 WrapperNode [2019-10-15 01:55:12,197 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:55:12,198 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:55:12,198 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:55:12,198 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:55:12,214 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,214 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,264 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,343 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,376 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,396 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... [2019-10-15 01:55:12,417 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:55:12,417 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:55:12,417 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:55:12,418 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:55:12,419 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:55:12,477 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:55:12,478 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:55:12,478 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 01:55:12,478 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 01:55:12,478 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:55:12,479 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 01:55:12,479 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 01:55:12,479 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:55:12,479 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:55:12,479 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 01:55:12,480 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:55:12,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:55:12,480 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:55:23,208 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:55:23,209 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:55:23,210 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:55:23 BoogieIcfgContainer [2019-10-15 01:55:23,210 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:55:23,212 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:55:23,212 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:55:23,217 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:55:23,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:55:10" (1/3) ... [2019-10-15 01:55:23,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5175e58f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:55:23, skipping insertion in model container [2019-10-15 01:55:23,219 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:55:12" (2/3) ... [2019-10-15 01:55:23,219 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5175e58f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:55:23, skipping insertion in model container [2019-10-15 01:55:23,220 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:55:23" (3/3) ... [2019-10-15 01:55:23,225 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem15_label49.c [2019-10-15 01:55:23,240 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:55:23,251 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:55:23,268 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:55:23,305 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:55:23,306 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:55:23,306 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:55:23,306 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:55:23,306 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:55:23,307 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:55:23,307 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:55:23,307 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:55:23,348 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states. [2019-10-15 01:55:23,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 01:55:23,358 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:55:23,359 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:55:23,361 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:55:23,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:55:23,369 INFO L82 PathProgramCache]: Analyzing trace with hash 648052589, now seen corresponding path program 1 times [2019-10-15 01:55:23,384 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:55:23,384 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560054375] [2019-10-15 01:55:23,385 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:23,385 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:23,385 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:55:23,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:55:23,774 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:55:23,777 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560054375] [2019-10-15 01:55:23,778 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:55:23,778 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:55:23,779 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928371826] [2019-10-15 01:55:23,785 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:55:23,785 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:55:23,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:55:23,801 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:55:23,804 INFO L87 Difference]: Start difference. First operand 244 states. Second operand 4 states. [2019-10-15 01:55:29,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:55:29,348 INFO L93 Difference]: Finished difference Result 953 states and 1852 transitions. [2019-10-15 01:55:29,349 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:55:29,350 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-10-15 01:55:29,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:55:29,374 INFO L225 Difference]: With dead ends: 953 [2019-10-15 01:55:29,374 INFO L226 Difference]: Without dead ends: 702 [2019-10-15 01:55:29,387 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:55:29,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2019-10-15 01:55:29,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 469. [2019-10-15 01:55:29,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 469 states. [2019-10-15 01:55:29,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 824 transitions. [2019-10-15 01:55:29,489 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 824 transitions. Word has length 11 [2019-10-15 01:55:29,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:55:29,490 INFO L462 AbstractCegarLoop]: Abstraction has 469 states and 824 transitions. [2019-10-15 01:55:29,490 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:55:29,490 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 824 transitions. [2019-10-15 01:55:29,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 01:55:29,492 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:55:29,492 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:55:29,492 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:55:29,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:55:29,493 INFO L82 PathProgramCache]: Analyzing trace with hash 1767039151, now seen corresponding path program 1 times [2019-10-15 01:55:29,493 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:55:29,493 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [413110797] [2019-10-15 01:55:29,494 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:29,494 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:29,494 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:55:29,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:55:29,688 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:55:29,689 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [413110797] [2019-10-15 01:55:29,689 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:55:29,689 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:55:29,689 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107622086] [2019-10-15 01:55:29,691 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:55:29,692 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:55:29,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:55:29,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:55:29,692 INFO L87 Difference]: Start difference. First operand 469 states and 824 transitions. Second operand 6 states. [2019-10-15 01:55:33,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:55:33,331 INFO L93 Difference]: Finished difference Result 1415 states and 2520 transitions. [2019-10-15 01:55:33,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:55:33,335 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-15 01:55:33,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:55:33,342 INFO L225 Difference]: With dead ends: 1415 [2019-10-15 01:55:33,343 INFO L226 Difference]: Without dead ends: 951 [2019-10-15 01:55:33,345 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:55:33,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 951 states. [2019-10-15 01:55:33,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 951 to 919. [2019-10-15 01:55:33,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 919 states. [2019-10-15 01:55:33,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 1578 transitions. [2019-10-15 01:55:33,404 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 1578 transitions. Word has length 23 [2019-10-15 01:55:33,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:55:33,405 INFO L462 AbstractCegarLoop]: Abstraction has 919 states and 1578 transitions. [2019-10-15 01:55:33,405 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:55:33,405 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 1578 transitions. [2019-10-15 01:55:33,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-15 01:55:33,406 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:55:33,406 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:55:33,407 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:55:33,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:55:33,407 INFO L82 PathProgramCache]: Analyzing trace with hash 890756068, now seen corresponding path program 1 times [2019-10-15 01:55:33,407 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:55:33,408 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894437494] [2019-10-15 01:55:33,408 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:33,408 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:33,409 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:55:33,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:55:33,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:55:33,560 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894437494] [2019-10-15 01:55:33,560 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:55:33,560 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:55:33,561 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661169219] [2019-10-15 01:55:33,561 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:55:33,561 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:55:33,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:55:33,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:55:33,563 INFO L87 Difference]: Start difference. First operand 919 states and 1578 transitions. Second operand 5 states. [2019-10-15 01:55:37,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:55:37,009 INFO L93 Difference]: Finished difference Result 2785 states and 4883 transitions. [2019-10-15 01:55:37,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:55:37,010 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2019-10-15 01:55:37,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:55:37,022 INFO L225 Difference]: With dead ends: 2785 [2019-10-15 01:55:37,031 INFO L226 Difference]: Without dead ends: 1871 [2019-10-15 01:55:37,035 INFO L600 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 [2019-10-15 01:55:37,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1871 states. [2019-10-15 01:55:37,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1871 to 1396. [2019-10-15 01:55:37,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1396 states. [2019-10-15 01:55:37,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1396 states to 1396 states and 2170 transitions. [2019-10-15 01:55:37,108 INFO L78 Accepts]: Start accepts. Automaton has 1396 states and 2170 transitions. Word has length 24 [2019-10-15 01:55:37,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:55:37,109 INFO L462 AbstractCegarLoop]: Abstraction has 1396 states and 2170 transitions. [2019-10-15 01:55:37,109 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:55:37,109 INFO L276 IsEmpty]: Start isEmpty. Operand 1396 states and 2170 transitions. [2019-10-15 01:55:37,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-15 01:55:37,110 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:55:37,110 INFO L380 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] [2019-10-15 01:55:37,111 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:55:37,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:55:37,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1484903724, now seen corresponding path program 1 times [2019-10-15 01:55:37,111 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:55:37,111 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110466638] [2019-10-15 01:55:37,111 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:37,112 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:37,112 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:55:37,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:55:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:55:37,170 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110466638] [2019-10-15 01:55:37,171 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:55:37,171 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:55:37,171 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587545243] [2019-10-15 01:55:37,172 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:55:37,172 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:55:37,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:55:37,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:55:37,172 INFO L87 Difference]: Start difference. First operand 1396 states and 2170 transitions. Second operand 4 states. [2019-10-15 01:55:43,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:55:43,786 INFO L93 Difference]: Finished difference Result 5097 states and 8036 transitions. [2019-10-15 01:55:43,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:55:43,787 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 32 [2019-10-15 01:55:43,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:55:43,814 INFO L225 Difference]: With dead ends: 5097 [2019-10-15 01:55:43,814 INFO L226 Difference]: Without dead ends: 3706 [2019-10-15 01:55:43,818 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:55:43,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3706 states. [2019-10-15 01:55:43,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3706 to 3415. [2019-10-15 01:55:43,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3415 states. [2019-10-15 01:55:43,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3415 states to 3415 states and 5078 transitions. [2019-10-15 01:55:43,922 INFO L78 Accepts]: Start accepts. Automaton has 3415 states and 5078 transitions. Word has length 32 [2019-10-15 01:55:43,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:55:43,922 INFO L462 AbstractCegarLoop]: Abstraction has 3415 states and 5078 transitions. [2019-10-15 01:55:43,922 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:55:43,922 INFO L276 IsEmpty]: Start isEmpty. Operand 3415 states and 5078 transitions. [2019-10-15 01:55:43,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 01:55:43,924 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:55:43,924 INFO L380 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] [2019-10-15 01:55:43,924 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:55:43,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:55:43,925 INFO L82 PathProgramCache]: Analyzing trace with hash -2006236862, now seen corresponding path program 1 times [2019-10-15 01:55:43,925 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:55:43,925 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374941374] [2019-10-15 01:55:43,925 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:43,925 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:43,926 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:55:43,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:55:44,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:55:44,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374941374] [2019-10-15 01:55:44,061 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:55:44,061 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:55:44,061 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1464031718] [2019-10-15 01:55:44,062 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:55:44,062 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:55:44,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:55:44,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:55:44,063 INFO L87 Difference]: Start difference. First operand 3415 states and 5078 transitions. Second operand 6 states. [2019-10-15 01:55:47,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:55:47,588 INFO L93 Difference]: Finished difference Result 7982 states and 12330 transitions. [2019-10-15 01:55:47,590 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-15 01:55:47,590 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 36 [2019-10-15 01:55:47,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:55:47,616 INFO L225 Difference]: With dead ends: 7982 [2019-10-15 01:55:47,616 INFO L226 Difference]: Without dead ends: 4572 [2019-10-15 01:55:47,627 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:55:47,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4572 states. [2019-10-15 01:55:47,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4572 to 4564. [2019-10-15 01:55:47,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4564 states. [2019-10-15 01:55:47,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4564 states to 4564 states and 6909 transitions. [2019-10-15 01:55:47,781 INFO L78 Accepts]: Start accepts. Automaton has 4564 states and 6909 transitions. Word has length 36 [2019-10-15 01:55:47,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:55:47,781 INFO L462 AbstractCegarLoop]: Abstraction has 4564 states and 6909 transitions. [2019-10-15 01:55:47,781 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:55:47,781 INFO L276 IsEmpty]: Start isEmpty. Operand 4564 states and 6909 transitions. [2019-10-15 01:55:47,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-10-15 01:55:47,790 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:55:47,791 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:55:47,791 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:55:47,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:55:47,791 INFO L82 PathProgramCache]: Analyzing trace with hash -288591147, now seen corresponding path program 1 times [2019-10-15 01:55:47,792 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:55:47,792 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451885007] [2019-10-15 01:55:47,792 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:47,792 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:55:47,792 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:55:47,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:55:47,929 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2019-10-15 01:55:47,930 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451885007] [2019-10-15 01:55:47,930 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:55:47,930 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:55:47,930 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366410640] [2019-10-15 01:55:47,931 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:55:47,931 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:55:47,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:55:47,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:55:47,932 INFO L87 Difference]: Start difference. First operand 4564 states and 6909 transitions. Second operand 4 states.