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 --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem11_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 20:04:07,767 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 20:04:07,770 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 20:04:07,789 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 20:04:07,789 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 20:04:07,791 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 20:04:07,793 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 20:04:07,797 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 20:04:07,801 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 20:04:07,804 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 20:04:07,805 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 20:04:07,807 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 20:04:07,807 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 20:04:07,810 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 20:04:07,812 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 20:04:07,814 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 20:04:07,816 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 20:04:07,819 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 20:04:07,820 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 20:04:07,825 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 20:04:07,829 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 20:04:07,831 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 20:04:07,834 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 20:04:07,834 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 20:04:07,837 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 20:04:07,837 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 20:04:07,837 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 20:04:07,838 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 20:04:07,838 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 20:04:07,839 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 20:04:07,839 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 20:04:07,840 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 20:04:07,841 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 20:04:07,841 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 20:04:07,842 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 20:04:07,842 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 20:04:07,843 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 20:04:07,843 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 20:04:07,843 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 20:04:07,844 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 20:04:07,845 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 20:04:07,846 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 [2019-10-13 20:04:07,859 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 20:04:07,859 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 20:04:07,861 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 20:04:07,861 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 20:04:07,861 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 20:04:07,861 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 20:04:07,861 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 20:04:07,862 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 20:04:07,862 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 20:04:07,862 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 20:04:07,862 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 20:04:07,863 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 20:04:07,863 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 20:04:07,863 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 20:04:07,863 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 20:04:07,863 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 20:04:07,864 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 20:04:07,864 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 20:04:07,864 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 20:04:07,864 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 20:04:07,864 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 20:04:07,865 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 20:04:07,865 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 20:04:07,865 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 20:04:07,865 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 20:04:07,865 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 20:04:07,866 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 20:04:07,866 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 20:04:07,866 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: Abstract domain -> IntervalDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Abstract interpretation Mode -> USE_PREDICATES [2019-10-13 20:04:08,157 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 20:04:08,171 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 20:04:08,177 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 20:04:08,179 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 20:04:08,180 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 20:04:08,180 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem11_label16.c [2019-10-13 20:04:08,258 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b31f0d8/5d529e6a82ae4278b7a4b86a64db1b90/FLAG963907546 [2019-10-13 20:04:08,917 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 20:04:08,921 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem11_label16.c [2019-10-13 20:04:08,940 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b31f0d8/5d529e6a82ae4278b7a4b86a64db1b90/FLAG963907546 [2019-10-13 20:04:09,113 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/76b31f0d8/5d529e6a82ae4278b7a4b86a64db1b90 [2019-10-13 20:04:09,124 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 20:04:09,125 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 20:04:09,126 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 20:04:09,126 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 20:04:09,130 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 20:04:09,131 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:04:09" (1/1) ... [2019-10-13 20:04:09,134 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ddb9b1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:09, skipping insertion in model container [2019-10-13 20:04:09,134 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 08:04:09" (1/1) ... [2019-10-13 20:04:09,142 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 20:04:09,196 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 20:04:09,896 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 20:04:09,912 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 20:04:10,149 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 20:04:10,170 INFO L192 MainTranslator]: Completed translation [2019-10-13 20:04:10,171 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10 WrapperNode [2019-10-13 20:04:10,172 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 20:04:10,173 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 20:04:10,173 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 20:04:10,173 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 20:04:10,189 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,189 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,229 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,283 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,304 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,320 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (1/1) ... [2019-10-13 20:04:10,333 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 20:04:10,334 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 20:04:10,334 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 20:04:10,334 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 20:04:10,335 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (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 [2019-10-13 20:04:10,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 20:04:10,403 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 20:04:10,404 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-10-13 20:04:10,404 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 20:04:10,404 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-10-13 20:04:10,404 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 20:04:10,404 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 20:04:10,404 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-10-13 20:04:10,405 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 20:04:10,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 20:04:10,405 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 20:04:12,287 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 20:04:12,288 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-13 20:04:12,291 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:04:12 BoogieIcfgContainer [2019-10-13 20:04:12,291 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 20:04:12,293 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 20:04:12,294 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 20:04:12,299 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 20:04:12,300 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 08:04:09" (1/3) ... [2019-10-13 20:04:12,301 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6288bf1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:04:12, skipping insertion in model container [2019-10-13 20:04:12,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 08:04:10" (2/3) ... [2019-10-13 20:04:12,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6288bf1d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 08:04:12, skipping insertion in model container [2019-10-13 20:04:12,303 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 08:04:12" (3/3) ... [2019-10-13 20:04:12,311 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem11_label16.c [2019-10-13 20:04:12,334 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 20:04:12,350 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 20:04:12,362 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 20:04:12,406 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 20:04:12,407 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 20:04:12,409 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 20:04:12,409 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 20:04:12,409 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 20:04:12,409 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 20:04:12,410 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 20:04:12,410 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 20:04:12,452 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states. [2019-10-13 20:04:12,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-10-13 20:04:12,463 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:04:12,464 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:04:12,466 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:04:12,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:04:12,473 INFO L82 PathProgramCache]: Analyzing trace with hash -467621694, now seen corresponding path program 1 times [2019-10-13 20:04:12,485 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:04:12,485 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077653796] [2019-10-13 20:04:12,486 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:12,486 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:12,486 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:04:12,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:12,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:04:12,886 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077653796] [2019-10-13 20:04:12,887 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:04:12,888 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 20:04:12,888 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124058128] [2019-10-13 20:04:12,893 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 20:04:12,895 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:04:12,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 20:04:12,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 20:04:12,913 INFO L87 Difference]: Start difference. First operand 292 states. Second operand 4 states. [2019-10-13 20:04:15,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:04:15,228 INFO L93 Difference]: Finished difference Result 981 states and 1757 transitions. [2019-10-13 20:04:15,229 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 20:04:15,231 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 49 [2019-10-13 20:04:15,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:04:15,252 INFO L225 Difference]: With dead ends: 981 [2019-10-13 20:04:15,252 INFO L226 Difference]: Without dead ends: 622 [2019-10-13 20:04:15,263 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 [2019-10-13 20:04:15,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2019-10-13 20:04:15,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 622. [2019-10-13 20:04:15,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 622 states. [2019-10-13 20:04:15,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 622 states to 622 states and 880 transitions. [2019-10-13 20:04:15,360 INFO L78 Accepts]: Start accepts. Automaton has 622 states and 880 transitions. Word has length 49 [2019-10-13 20:04:15,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:04:15,361 INFO L462 AbstractCegarLoop]: Abstraction has 622 states and 880 transitions. [2019-10-13 20:04:15,362 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 20:04:15,362 INFO L276 IsEmpty]: Start isEmpty. Operand 622 states and 880 transitions. [2019-10-13 20:04:15,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-10-13 20:04:15,369 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:04:15,370 INFO L380 BasicCegarLoop]: trace histogram [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, 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] [2019-10-13 20:04:15,370 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:04:15,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:04:15,371 INFO L82 PathProgramCache]: Analyzing trace with hash -2099265230, now seen corresponding path program 1 times [2019-10-13 20:04:15,371 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:04:15,371 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496092578] [2019-10-13 20:04:15,372 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:15,372 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:15,372 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:04:15,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:15,563 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:04:15,563 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496092578] [2019-10-13 20:04:15,564 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:04:15,564 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 20:04:15,564 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545011217] [2019-10-13 20:04:15,566 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 20:04:15,567 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:04:15,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 20:04:15,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-10-13 20:04:15,568 INFO L87 Difference]: Start difference. First operand 622 states and 880 transitions. Second operand 6 states. [2019-10-13 20:04:17,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:04:17,520 INFO L93 Difference]: Finished difference Result 1837 states and 2643 transitions. [2019-10-13 20:04:17,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 20:04:17,521 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 129 [2019-10-13 20:04:17,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:04:17,530 INFO L225 Difference]: With dead ends: 1837 [2019-10-13 20:04:17,530 INFO L226 Difference]: Without dead ends: 1221 [2019-10-13 20:04:17,533 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-10-13 20:04:17,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1221 states. [2019-10-13 20:04:17,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1221 to 1210. [2019-10-13 20:04:17,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1210 states. [2019-10-13 20:04:17,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1210 states to 1210 states and 1600 transitions. [2019-10-13 20:04:17,604 INFO L78 Accepts]: Start accepts. Automaton has 1210 states and 1600 transitions. Word has length 129 [2019-10-13 20:04:17,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:04:17,605 INFO L462 AbstractCegarLoop]: Abstraction has 1210 states and 1600 transitions. [2019-10-13 20:04:17,605 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 20:04:17,605 INFO L276 IsEmpty]: Start isEmpty. Operand 1210 states and 1600 transitions. [2019-10-13 20:04:17,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2019-10-13 20:04:17,611 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:04:17,612 INFO L380 BasicCegarLoop]: trace histogram [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, 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] [2019-10-13 20:04:17,612 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:04:17,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:04:17,612 INFO L82 PathProgramCache]: Analyzing trace with hash -2045537286, now seen corresponding path program 1 times [2019-10-13 20:04:17,613 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:04:17,613 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283999207] [2019-10-13 20:04:17,613 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:17,613 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:17,614 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:04:17,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:04:17,836 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283999207] [2019-10-13 20:04:17,836 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 20:04:17,836 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 20:04:17,836 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877096424] [2019-10-13 20:04:17,837 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 20:04:17,838 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:04:17,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 20:04:17,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-13 20:04:17,838 INFO L87 Difference]: Start difference. First operand 1210 states and 1600 transitions. Second operand 4 states. [2019-10-13 20:04:19,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:04:19,723 INFO L93 Difference]: Finished difference Result 4339 states and 5985 transitions. [2019-10-13 20:04:19,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 20:04:19,724 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 180 [2019-10-13 20:04:19,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:04:19,747 INFO L225 Difference]: With dead ends: 4339 [2019-10-13 20:04:19,747 INFO L226 Difference]: Without dead ends: 3135 [2019-10-13 20:04:19,752 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 [2019-10-13 20:04:19,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3135 states. [2019-10-13 20:04:19,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3135 to 2927. [2019-10-13 20:04:19,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2927 states. [2019-10-13 20:04:19,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2927 states to 2927 states and 3836 transitions. [2019-10-13 20:04:19,864 INFO L78 Accepts]: Start accepts. Automaton has 2927 states and 3836 transitions. Word has length 180 [2019-10-13 20:04:19,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:04:19,865 INFO L462 AbstractCegarLoop]: Abstraction has 2927 states and 3836 transitions. [2019-10-13 20:04:19,865 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 20:04:19,865 INFO L276 IsEmpty]: Start isEmpty. Operand 2927 states and 3836 transitions. [2019-10-13 20:04:19,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2019-10-13 20:04:19,872 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:04:19,872 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:04:19,872 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:04:19,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:04:19,873 INFO L82 PathProgramCache]: Analyzing trace with hash 817562012, now seen corresponding path program 1 times [2019-10-13 20:04:19,873 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:04:19,873 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716624509] [2019-10-13 20:04:19,874 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:19,874 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:19,874 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:04:19,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:20,099 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 84 proven. 68 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 20:04:20,100 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716624509] [2019-10-13 20:04:20,100 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817578429] [2019-10-13 20:04:20,101 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 [2019-10-13 20:04:20,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:20,213 INFO L256 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 20:04:20,226 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 20:04:20,425 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 113 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2019-10-13 20:04:20,426 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 20:04:20,596 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 84 proven. 68 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 20:04:20,597 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-10-13 20:04:20,597 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2019-10-13 20:04:20,597 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92071733] [2019-10-13 20:04:20,599 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-13 20:04:20,600 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-13 20:04:20,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-13 20:04:20,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2019-10-13 20:04:20,601 INFO L87 Difference]: Start difference. First operand 2927 states and 3836 transitions. Second operand 5 states. [2019-10-13 20:04:22,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 20:04:22,373 INFO L93 Difference]: Finished difference Result 6889 states and 9368 transitions. [2019-10-13 20:04:22,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 20:04:22,374 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 223 [2019-10-13 20:04:22,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 20:04:22,400 INFO L225 Difference]: With dead ends: 6889 [2019-10-13 20:04:22,401 INFO L226 Difference]: Without dead ends: 3968 [2019-10-13 20:04:22,411 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 455 GetRequests, 442 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2019-10-13 20:04:22,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3968 states. [2019-10-13 20:04:22,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3968 to 3556. [2019-10-13 20:04:22,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3556 states. [2019-10-13 20:04:22,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3556 states to 3556 states and 4752 transitions. [2019-10-13 20:04:22,557 INFO L78 Accepts]: Start accepts. Automaton has 3556 states and 4752 transitions. Word has length 223 [2019-10-13 20:04:22,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 20:04:22,557 INFO L462 AbstractCegarLoop]: Abstraction has 3556 states and 4752 transitions. [2019-10-13 20:04:22,557 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-13 20:04:22,558 INFO L276 IsEmpty]: Start isEmpty. Operand 3556 states and 4752 transitions. [2019-10-13 20:04:22,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2019-10-13 20:04:22,566 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 20:04:22,566 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 20:04:22,774 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 20:04:22,774 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 20:04:22,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 20:04:22,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1368554123, now seen corresponding path program 1 times [2019-10-13 20:04:22,777 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-13 20:04:22,777 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568284922] [2019-10-13 20:04:22,777 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:22,777 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 20:04:22,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 20:04:22,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:23,093 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 155 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:04:23,095 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568284922] [2019-10-13 20:04:23,095 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718856069] [2019-10-13 20:04:23,096 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 [2019-10-13 20:04:23,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 20:04:23,196 INFO L256 TraceCheckSpWp]: Trace formula consists of 428 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 20:04:23,221 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 20:04:23,292 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 155 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:04:23,292 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-13 20:04:23,410 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 155 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 20:04:23,411 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2144403935] [2019-10-13 20:04:23,418 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 225 [2019-10-13 20:04:23,479 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-10-13 20:04:23,480 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)