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/Problem16_label35.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:56:05,942 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:56:05,944 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:56:05,962 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-10-15 01:56:06,017 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:56:06,020 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:56:06,020 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:56:06,024 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 01:56:06,042 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:56:06,042 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:56:06,044 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:56:06,044 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:56:06,044 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:56:06,045 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:56:06,045 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:56:06,045 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:56:06,045 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:56:06,045 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:56:06,046 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:56:06,047 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:56:06,047 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:56:06,047 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:56:06,047 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:56:06,048 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:56:06,048 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:56:06,048 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:56:06,048 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:56:06,049 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:56:06,049 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:56:06,049 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:56:06,049 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:56:06,050 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:56:06,050 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:56:06,050 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:56:06,050 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:56:06,050 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:56:06,051 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 01:56:06,319 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:56:06,337 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:56:06,340 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:56:06,341 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:56:06,342 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:56:06,343 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem16_label35.c [2019-10-15 01:56:06,408 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c09bd83a/209d277da63e4d129cd08f0364301f2b/FLAG67fb1a010 [2019-10-15 01:56:07,024 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:56:07,025 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem16_label35.c [2019-10-15 01:56:07,045 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c09bd83a/209d277da63e4d129cd08f0364301f2b/FLAG67fb1a010 [2019-10-15 01:56:07,253 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c09bd83a/209d277da63e4d129cd08f0364301f2b [2019-10-15 01:56:07,265 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:56:07,267 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:56:07,268 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:56:07,268 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:56:07,272 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:56:07,273 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:56:07" (1/1) ... [2019-10-15 01:56:07,275 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a756964 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:07, skipping insertion in model container [2019-10-15 01:56:07,275 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:56:07" (1/1) ... [2019-10-15 01:56:07,283 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:56:07,360 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:56:08,151 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:56:08,166 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:56:08,439 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:56:08,459 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:56:08,459 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08 WrapperNode [2019-10-15 01:56:08,460 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:56:08,461 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:56:08,461 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:56:08,461 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:56:08,475 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,475 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,515 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,515 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,584 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,601 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,612 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (1/1) ... [2019-10-15 01:56:08,628 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:56:08,629 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:56:08,629 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:56:08,629 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:56:08,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (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 01:56:08,727 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:56:08,728 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:56:08,728 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-15 01:56:08,728 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-10-15 01:56:08,728 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:56:08,729 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-15 01:56:08,730 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-10-15 01:56:08,730 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:56:08,730 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:56:08,730 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-15 01:56:08,731 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:56:08,732 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:56:08,732 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:56:23,193 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:56:23,193 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:56:23,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:56:23 BoogieIcfgContainer [2019-10-15 01:56:23,195 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:56:23,196 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:56:23,196 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:56:23,199 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:56:23,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:56:07" (1/3) ... [2019-10-15 01:56:23,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f7ce489 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:56:23, skipping insertion in model container [2019-10-15 01:56:23,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:56:08" (2/3) ... [2019-10-15 01:56:23,201 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5f7ce489 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:56:23, skipping insertion in model container [2019-10-15 01:56:23,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:56:23" (3/3) ... [2019-10-15 01:56:23,203 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem16_label35.c [2019-10-15 01:56:23,216 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:56:23,223 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:56:23,234 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:56:23,262 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:56:23,262 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:56:23,262 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:56:23,263 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:56:23,263 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:56:23,263 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:56:23,263 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:56:23,263 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:56:23,290 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states. [2019-10-15 01:56:23,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 01:56:23,296 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:23,297 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:23,301 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:23,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:23,307 INFO L82 PathProgramCache]: Analyzing trace with hash 863563327, now seen corresponding path program 1 times [2019-10-15 01:56:23,316 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:23,317 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397374164] [2019-10-15 01:56:23,317 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:23,317 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:23,318 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:23,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:23,569 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 01:56:23,570 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397374164] [2019-10-15 01:56:23,571 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:23,571 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:56:23,571 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [695481874] [2019-10-15 01:56:23,575 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:56:23,576 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:23,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:56:23,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:56:23,593 INFO L87 Difference]: Start difference. First operand 244 states. Second operand 4 states. [2019-10-15 01:56:25,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:25,935 INFO L93 Difference]: Finished difference Result 953 states and 1852 transitions. [2019-10-15 01:56:25,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:56:25,937 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2019-10-15 01:56:25,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:25,960 INFO L225 Difference]: With dead ends: 953 [2019-10-15 01:56:25,960 INFO L226 Difference]: Without dead ends: 702 [2019-10-15 01:56:25,971 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 01:56:25,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2019-10-15 01:56:26,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 463. [2019-10-15 01:56:26,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 463 states. [2019-10-15 01:56:26,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 876 transitions. [2019-10-15 01:56:26,054 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 876 transitions. Word has length 11 [2019-10-15 01:56:26,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:26,055 INFO L462 AbstractCegarLoop]: Abstraction has 463 states and 876 transitions. [2019-10-15 01:56:26,055 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:56:26,055 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 876 transitions. [2019-10-15 01:56:26,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:56:26,057 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:26,057 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:26,058 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:26,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:26,058 INFO L82 PathProgramCache]: Analyzing trace with hash 163966973, now seen corresponding path program 1 times [2019-10-15 01:56:26,058 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:26,059 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1239035847] [2019-10-15 01:56:26,059 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:26,059 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:26,059 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:26,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:26,150 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 01:56:26,151 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1239035847] [2019-10-15 01:56:26,151 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:26,151 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:56:26,151 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396048016] [2019-10-15 01:56:26,153 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:56:26,153 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:26,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:56:26,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:56:26,154 INFO L87 Difference]: Start difference. First operand 463 states and 876 transitions. Second operand 5 states. [2019-10-15 01:56:28,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:28,161 INFO L93 Difference]: Finished difference Result 1395 states and 2674 transitions. [2019-10-15 01:56:28,161 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:56:28,161 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2019-10-15 01:56:28,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:28,170 INFO L225 Difference]: With dead ends: 1395 [2019-10-15 01:56:28,171 INFO L226 Difference]: Without dead ends: 937 [2019-10-15 01:56:28,176 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 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 01:56:28,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 937 states. [2019-10-15 01:56:28,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 937 to 918. [2019-10-15 01:56:28,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 918 states. [2019-10-15 01:56:28,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 918 states to 918 states and 1637 transitions. [2019-10-15 01:56:28,321 INFO L78 Accepts]: Start accepts. Automaton has 918 states and 1637 transitions. Word has length 21 [2019-10-15 01:56:28,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:28,321 INFO L462 AbstractCegarLoop]: Abstraction has 918 states and 1637 transitions. [2019-10-15 01:56:28,321 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:56:28,322 INFO L276 IsEmpty]: Start isEmpty. Operand 918 states and 1637 transitions. [2019-10-15 01:56:28,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-10-15 01:56:28,323 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:28,323 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 01:56:28,323 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:28,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:28,324 INFO L82 PathProgramCache]: Analyzing trace with hash 532151662, now seen corresponding path program 1 times [2019-10-15 01:56:28,325 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:28,325 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447047723] [2019-10-15 01:56:28,326 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:28,326 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:28,326 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:28,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:28,453 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 01:56:28,454 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447047723] [2019-10-15 01:56:28,454 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:28,454 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:56:28,454 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1302333174] [2019-10-15 01:56:28,455 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:56:28,455 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:28,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:56:28,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:28,456 INFO L87 Difference]: Start difference. First operand 918 states and 1637 transitions. Second operand 6 states. [2019-10-15 01:56:30,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:30,664 INFO L93 Difference]: Finished difference Result 2531 states and 4571 transitions. [2019-10-15 01:56:30,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:56:30,665 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 24 [2019-10-15 01:56:30,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:30,676 INFO L225 Difference]: With dead ends: 2531 [2019-10-15 01:56:30,676 INFO L226 Difference]: Without dead ends: 1618 [2019-10-15 01:56:30,679 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 01:56:30,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1618 states. [2019-10-15 01:56:30,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1618 to 1594. [2019-10-15 01:56:30,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1594 states. [2019-10-15 01:56:30,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1594 states to 1594 states and 2779 transitions. [2019-10-15 01:56:30,742 INFO L78 Accepts]: Start accepts. Automaton has 1594 states and 2779 transitions. Word has length 24 [2019-10-15 01:56:30,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:30,743 INFO L462 AbstractCegarLoop]: Abstraction has 1594 states and 2779 transitions. [2019-10-15 01:56:30,743 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:56:30,743 INFO L276 IsEmpty]: Start isEmpty. Operand 1594 states and 2779 transitions. [2019-10-15 01:56:30,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-15 01:56:30,744 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:30,744 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] [2019-10-15 01:56:30,744 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:30,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:30,745 INFO L82 PathProgramCache]: Analyzing trace with hash 336021045, now seen corresponding path program 1 times [2019-10-15 01:56:30,745 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:30,745 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1490016348] [2019-10-15 01:56:30,745 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:30,746 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:30,746 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:30,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:30,815 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 01:56:30,815 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1490016348] [2019-10-15 01:56:30,816 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:30,816 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:56:30,816 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922327118] [2019-10-15 01:56:30,817 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:56:30,817 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:30,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:56:30,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:30,817 INFO L87 Difference]: Start difference. First operand 1594 states and 2779 transitions. Second operand 6 states. [2019-10-15 01:56:32,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:32,750 INFO L93 Difference]: Finished difference Result 3661 states and 6383 transitions. [2019-10-15 01:56:32,750 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-15 01:56:32,751 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2019-10-15 01:56:32,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:32,762 INFO L225 Difference]: With dead ends: 3661 [2019-10-15 01:56:32,763 INFO L226 Difference]: Without dead ends: 2072 [2019-10-15 01:56:32,766 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 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 01:56:32,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2072 states. [2019-10-15 01:56:32,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2072 to 1974. [2019-10-15 01:56:32,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1974 states. [2019-10-15 01:56:32,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1974 states to 1974 states and 3150 transitions. [2019-10-15 01:56:32,837 INFO L78 Accepts]: Start accepts. Automaton has 1974 states and 3150 transitions. Word has length 25 [2019-10-15 01:56:32,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:32,837 INFO L462 AbstractCegarLoop]: Abstraction has 1974 states and 3150 transitions. [2019-10-15 01:56:32,837 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:56:32,838 INFO L276 IsEmpty]: Start isEmpty. Operand 1974 states and 3150 transitions. [2019-10-15 01:56:32,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:56:32,839 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:32,839 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] [2019-10-15 01:56:32,839 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:32,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:32,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1761284058, now seen corresponding path program 1 times [2019-10-15 01:56:32,840 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:32,840 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [423544605] [2019-10-15 01:56:32,840 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:32,840 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:32,840 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:32,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:32,917 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 01:56:32,918 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [423544605] [2019-10-15 01:56:32,918 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:32,918 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:56:32,919 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [870644170] [2019-10-15 01:56:32,919 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:56:32,921 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:32,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:56:32,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:32,921 INFO L87 Difference]: Start difference. First operand 1974 states and 3150 transitions. Second operand 6 states. [2019-10-15 01:56:34,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:34,921 INFO L93 Difference]: Finished difference Result 5108 states and 8377 transitions. [2019-10-15 01:56:34,930 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:56:34,930 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2019-10-15 01:56:34,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:34,950 INFO L225 Difference]: With dead ends: 5108 [2019-10-15 01:56:34,951 INFO L226 Difference]: Without dead ends: 3139 [2019-10-15 01:56:34,956 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-10-15 01:56:34,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3139 states. [2019-10-15 01:56:35,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3139 to 3067. [2019-10-15 01:56:35,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3067 states. [2019-10-15 01:56:35,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3067 states to 3067 states and 4847 transitions. [2019-10-15 01:56:35,063 INFO L78 Accepts]: Start accepts. Automaton has 3067 states and 4847 transitions. Word has length 28 [2019-10-15 01:56:35,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:35,063 INFO L462 AbstractCegarLoop]: Abstraction has 3067 states and 4847 transitions. [2019-10-15 01:56:35,064 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:56:35,064 INFO L276 IsEmpty]: Start isEmpty. Operand 3067 states and 4847 transitions. [2019-10-15 01:56:35,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 01:56:35,066 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:35,066 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 01:56:35,067 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:35,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:35,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1572697494, now seen corresponding path program 1 times [2019-10-15 01:56:35,067 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:35,067 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739450205] [2019-10-15 01:56:35,068 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:35,068 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:35,068 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:35,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:35,148 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 01:56:35,149 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739450205] [2019-10-15 01:56:35,149 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:56:35,149 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-15 01:56:35,150 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167769293] [2019-10-15 01:56:35,150 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-15 01:56:35,150 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:35,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-15 01:56:35,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:35,151 INFO L87 Difference]: Start difference. First operand 3067 states and 4847 transitions. Second operand 6 states. [2019-10-15 01:56:37,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:37,065 INFO L93 Difference]: Finished difference Result 8110 states and 13134 transitions. [2019-10-15 01:56:37,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:56:37,071 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 36 [2019-10-15 01:56:37,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:37,095 INFO L225 Difference]: With dead ends: 8110 [2019-10-15 01:56:37,095 INFO L226 Difference]: Without dead ends: 5048 [2019-10-15 01:56:37,104 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 01:56:37,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5048 states. [2019-10-15 01:56:37,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5048 to 4116. [2019-10-15 01:56:37,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4116 states. [2019-10-15 01:56:37,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4116 states to 4116 states and 6098 transitions. [2019-10-15 01:56:37,224 INFO L78 Accepts]: Start accepts. Automaton has 4116 states and 6098 transitions. Word has length 36 [2019-10-15 01:56:37,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:37,225 INFO L462 AbstractCegarLoop]: Abstraction has 4116 states and 6098 transitions. [2019-10-15 01:56:37,225 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-15 01:56:37,225 INFO L276 IsEmpty]: Start isEmpty. Operand 4116 states and 6098 transitions. [2019-10-15 01:56:37,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-10-15 01:56:37,226 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:37,227 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, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:37,227 INFO L410 AbstractCegarLoop]: === Iteration 7 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:37,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:37,227 INFO L82 PathProgramCache]: Analyzing trace with hash -103647695, now seen corresponding path program 1 times [2019-10-15 01:56:37,227 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:37,228 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092611403] [2019-10-15 01:56:37,228 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:37,228 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:37,228 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:37,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:37,290 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:56:37,291 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092611403] [2019-10-15 01:56:37,291 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964708815] [2019-10-15 01:56:37,291 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:37,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:37,359 INFO L256 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:56:37,365 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:37,412 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 01:56:37,413 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:37,451 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 01:56:37,452 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:56:37,452 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2019-10-15 01:56:37,452 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799307213] [2019-10-15 01:56:37,453 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:56:37,453 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:37,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:56:37,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:37,454 INFO L87 Difference]: Start difference. First operand 4116 states and 6098 transitions. Second operand 4 states. [2019-10-15 01:56:39,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:39,628 INFO L93 Difference]: Finished difference Result 11921 states and 17880 transitions. [2019-10-15 01:56:39,628 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:56:39,628 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 43 [2019-10-15 01:56:39,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:39,663 INFO L225 Difference]: With dead ends: 11921 [2019-10-15 01:56:39,663 INFO L226 Difference]: Without dead ends: 7810 [2019-10-15 01:56:39,675 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 85 SyntacticMatches, 4 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:39,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7810 states. [2019-10-15 01:56:39,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7810 to 6661. [2019-10-15 01:56:39,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6661 states. [2019-10-15 01:56:39,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6661 states to 6661 states and 9624 transitions. [2019-10-15 01:56:39,886 INFO L78 Accepts]: Start accepts. Automaton has 6661 states and 9624 transitions. Word has length 43 [2019-10-15 01:56:39,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:39,887 INFO L462 AbstractCegarLoop]: Abstraction has 6661 states and 9624 transitions. [2019-10-15 01:56:39,887 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:56:39,887 INFO L276 IsEmpty]: Start isEmpty. Operand 6661 states and 9624 transitions. [2019-10-15 01:56:39,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2019-10-15 01:56:39,893 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:39,893 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 1] [2019-10-15 01:56:40,101 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:40,101 INFO L410 AbstractCegarLoop]: === Iteration 8 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:40,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:40,102 INFO L82 PathProgramCache]: Analyzing trace with hash -369746813, now seen corresponding path program 1 times [2019-10-15 01:56:40,102 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:40,102 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035845716] [2019-10-15 01:56:40,102 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:40,102 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:40,102 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:40,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:40,309 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-10-15 01:56:40,310 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035845716] [2019-10-15 01:56:40,310 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [751909520] [2019-10-15 01:56:40,310 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:40,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:40,411 INFO L256 TraceCheckSpWp]: Trace formula consists of 489 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:56:40,416 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:40,449 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-10-15 01:56:40,449 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:40,565 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2019-10-15 01:56:40,566 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:56:40,566 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2019-10-15 01:56:40,566 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324910534] [2019-10-15 01:56:40,567 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:56:40,567 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:40,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:56:40,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:40,568 INFO L87 Difference]: Start difference. First operand 6661 states and 9624 transitions. Second operand 4 states. [2019-10-15 01:56:42,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:56:42,221 INFO L93 Difference]: Finished difference Result 14897 states and 21154 transitions. [2019-10-15 01:56:42,222 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:56:42,222 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 155 [2019-10-15 01:56:42,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:56:42,254 INFO L225 Difference]: With dead ends: 14897 [2019-10-15 01:56:42,255 INFO L226 Difference]: Without dead ends: 8241 [2019-10-15 01:56:42,272 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 314 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:56:42,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8241 states. [2019-10-15 01:56:42,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8241 to 6677. [2019-10-15 01:56:42,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6677 states. [2019-10-15 01:56:42,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6677 states to 6677 states and 9519 transitions. [2019-10-15 01:56:42,442 INFO L78 Accepts]: Start accepts. Automaton has 6677 states and 9519 transitions. Word has length 155 [2019-10-15 01:56:42,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:56:42,443 INFO L462 AbstractCegarLoop]: Abstraction has 6677 states and 9519 transitions. [2019-10-15 01:56:42,443 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:56:42,443 INFO L276 IsEmpty]: Start isEmpty. Operand 6677 states and 9519 transitions. [2019-10-15 01:56:42,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2019-10-15 01:56:42,452 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:56:42,453 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 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, 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:56:42,665 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:42,666 INFO L410 AbstractCegarLoop]: === Iteration 9 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:56:42,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:56:42,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1061876882, now seen corresponding path program 1 times [2019-10-15 01:56:42,667 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:56:42,668 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891648836] [2019-10-15 01:56:42,668 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:42,668 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:56:42,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:56:42,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:43,368 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:56:43,369 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891648836] [2019-10-15 01:56:43,369 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891391187] [2019-10-15 01:56:43,369 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:56:43,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:56:43,511 INFO L256 TraceCheckSpWp]: Trace formula consists of 630 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 01:56:43,527 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:56:43,556 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:56:43,634 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 45 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:56:43,634 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:56:43,783 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:56:43,784 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-15 01:56:43,784 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 9 [2019-10-15 01:56:43,785 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223954347] [2019-10-15 01:56:43,786 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:56:43,786 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:56:43,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:56:43,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2019-10-15 01:56:43,787 INFO L87 Difference]: Start difference. First operand 6677 states and 9519 transitions. Second operand 5 states.