/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --abstractinterpretationv2.abstract.domain IntervalDomain --traceabstraction.trace.refinement.strategy TAIPAN --traceabstraction.abstract.interpretation.mode USE_PREDICATES -i ../../../trunk/examples/svcomp/eca-rers2012/Problem10_label27.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:42:52,222 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:42:52,224 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:42:52,236 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:42:52,247 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:42:52,248 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:42:52,249 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:42:52,250 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:42:52,250 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:42:52,251 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:42:52,253 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:42:52,255 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:42:52,257 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:42:52,258 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:42:52,260 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:42:52,260 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:42:52,263 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:42:52,272 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:42:52,273 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:42:52,274 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:42:52,274 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 22:42:52,289 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:42:52,290 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:42:52,291 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:42:52,291 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:42:52,291 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:42:52,291 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:42:52,292 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:42:52,292 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:42:52,292 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:42:52,292 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:42:52,292 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:42:52,293 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:42:52,293 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:42:52,293 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:42:52,293 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:42:52,293 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:42:52,294 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:42:52,294 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:42:52,294 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:42:52,294 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:42:52,294 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:42:52,295 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:42:52,295 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:42:52,295 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:42:52,295 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:42:52,295 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:42:52,296 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:42:52,296 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:42:52,296 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 [2019-11-06 22:42:52,579 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:42:52,596 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:42:52,599 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:42:52,601 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:42:52,601 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:42:52,602 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label27.c [2019-11-06 22:42:52,662 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a95b95e4e/e54937484411455f90b8858dc5f27391/FLAGa6353eb14 [2019-11-06 22:42:53,213 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:42:53,214 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label27.c [2019-11-06 22:42:53,227 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a95b95e4e/e54937484411455f90b8858dc5f27391/FLAGa6353eb14 [2019-11-06 22:42:53,472 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a95b95e4e/e54937484411455f90b8858dc5f27391 [2019-11-06 22:42:53,481 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:42:53,482 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:42:53,483 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:42:53,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:42:53,487 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:42:53,488 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:42:53" (1/1) ... [2019-11-06 22:42:53,491 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73c161c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:53, skipping insertion in model container [2019-11-06 22:42:53,491 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:42:53" (1/1) ... [2019-11-06 22:42:53,498 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:42:53,554 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:42:53,979 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:42:54,082 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:42:54,209 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:42:54,225 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:42:54,226 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54 WrapperNode [2019-11-06 22:42:54,226 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:42:54,227 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:42:54,227 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:42:54,227 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:42:54,242 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,242 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,260 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,261 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,299 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,325 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,347 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... [2019-11-06 22:42:54,356 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:42:54,357 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:42:54,357 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:42:54,357 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:42:54,358 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:42:54,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:42:54,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:42:54,429 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:42:54,429 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:42:54,430 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:42:54,430 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:42:54,430 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:42:54,430 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:42:54,430 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:42:54,431 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:42:54,431 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:42:55,661 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:42:55,661 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:42:55,666 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:42:55 BoogieIcfgContainer [2019-11-06 22:42:55,666 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:42:55,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:42:55,668 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:42:55,672 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:42:55,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:42:53" (1/3) ... [2019-11-06 22:42:55,673 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12d2ee3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:42:55, skipping insertion in model container [2019-11-06 22:42:55,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:42:54" (2/3) ... [2019-11-06 22:42:55,675 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12d2ee3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:42:55, skipping insertion in model container [2019-11-06 22:42:55,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:42:55" (3/3) ... [2019-11-06 22:42:55,680 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label27.c [2019-11-06 22:42:55,694 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:42:55,703 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:42:55,714 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:42:55,746 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:42:55,747 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:42:55,747 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:42:55,747 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:42:55,747 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:42:55,747 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:42:55,748 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:42:55,748 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:42:55,774 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2019-11-06 22:42:55,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2019-11-06 22:42:55,783 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:55,784 INFO L410 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:42:55,786 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:55,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:55,791 INFO L82 PathProgramCache]: Analyzing trace with hash 215216599, now seen corresponding path program 1 times [2019-11-06 22:42:55,798 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:55,798 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314145665] [2019-11-06 22:42:55,799 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:55,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:56,104 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:56,105 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314145665] [2019-11-06 22:42:56,106 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:42:56,106 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:42:56,108 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727722443] [2019-11-06 22:42:56,113 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:42:56,115 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:56,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:42:56,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:42:56,132 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 4 states. [2019-11-06 22:42:57,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:42:57,514 INFO L93 Difference]: Finished difference Result 733 states and 1294 transitions. [2019-11-06 22:42:57,515 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:42:57,516 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 66 [2019-11-06 22:42:57,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:42:57,544 INFO L225 Difference]: With dead ends: 733 [2019-11-06 22:42:57,544 INFO L226 Difference]: Without dead ends: 437 [2019-11-06 22:42:57,552 INFO L630 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 [2019-11-06 22:42:57,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2019-11-06 22:42:57,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 294. [2019-11-06 22:42:57,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2019-11-06 22:42:57,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 446 transitions. [2019-11-06 22:42:57,626 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 446 transitions. Word has length 66 [2019-11-06 22:42:57,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:42:57,627 INFO L462 AbstractCegarLoop]: Abstraction has 294 states and 446 transitions. [2019-11-06 22:42:57,627 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:42:57,627 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 446 transitions. [2019-11-06 22:42:57,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2019-11-06 22:42:57,634 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:57,634 INFO L410 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, 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] [2019-11-06 22:42:57,635 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:57,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:57,635 INFO L82 PathProgramCache]: Analyzing trace with hash -51785766, now seen corresponding path program 1 times [2019-11-06 22:42:57,635 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:57,637 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [612803782] [2019-11-06 22:42:57,637 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:57,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:57,916 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 22:42:57,917 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [612803782] [2019-11-06 22:42:57,918 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343996356] [2019-11-06 22:42:57,918 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:42:57,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:57,996 INFO L256 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:42:58,006 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:42:58,092 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:58,093 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:42:58,144 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:58,145 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-06 22:42:58,145 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [4] total 6 [2019-11-06 22:42:58,158 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1582064287] [2019-11-06 22:42:58,160 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:42:58,161 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:58,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:42:58,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:42:58,162 INFO L87 Difference]: Start difference. First operand 294 states and 446 transitions. Second operand 4 states. [2019-11-06 22:42:59,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:42:59,061 INFO L93 Difference]: Finished difference Result 868 states and 1349 transitions. [2019-11-06 22:42:59,062 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:42:59,062 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 136 [2019-11-06 22:42:59,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:42:59,073 INFO L225 Difference]: With dead ends: 868 [2019-11-06 22:42:59,074 INFO L226 Difference]: Without dead ends: 866 [2019-11-06 22:42:59,078 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 274 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:42:59,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 866 states. [2019-11-06 22:42:59,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 866 to 294. [2019-11-06 22:42:59,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2019-11-06 22:42:59,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 446 transitions. [2019-11-06 22:42:59,116 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 446 transitions. Word has length 136 [2019-11-06 22:42:59,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:42:59,117 INFO L462 AbstractCegarLoop]: Abstraction has 294 states and 446 transitions. [2019-11-06 22:42:59,118 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:42:59,118 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 446 transitions. [2019-11-06 22:42:59,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2019-11-06 22:42:59,122 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:42:59,123 INFO L410 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, 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] [2019-11-06 22:42:59,326 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:42:59,327 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:42:59,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:42:59,327 INFO L82 PathProgramCache]: Analyzing trace with hash 1642827225, now seen corresponding path program 1 times [2019-11-06 22:42:59,328 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:42:59,328 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460718166] [2019-11-06 22:42:59,329 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:42:59,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:42:59,600 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:42:59,601 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460718166] [2019-11-06 22:42:59,601 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:42:59,601 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 22:42:59,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078613001] [2019-11-06 22:42:59,603 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:42:59,603 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:42:59,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:42:59,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:42:59,604 INFO L87 Difference]: Start difference. First operand 294 states and 446 transitions. Second operand 5 states. [2019-11-06 22:43:00,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:43:00,584 INFO L93 Difference]: Finished difference Result 743 states and 1137 transitions. [2019-11-06 22:43:00,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 22:43:00,585 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 191 [2019-11-06 22:43:00,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:43:00,590 INFO L225 Difference]: With dead ends: 743 [2019-11-06 22:43:00,590 INFO L226 Difference]: Without dead ends: 455 [2019-11-06 22:43:00,592 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:43:00,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2019-11-06 22:43:00,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 447. [2019-11-06 22:43:00,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 447 states. [2019-11-06 22:43:00,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 639 transitions. [2019-11-06 22:43:00,614 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 639 transitions. Word has length 191 [2019-11-06 22:43:00,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:43:00,615 INFO L462 AbstractCegarLoop]: Abstraction has 447 states and 639 transitions. [2019-11-06 22:43:00,615 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:43:00,615 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 639 transitions. [2019-11-06 22:43:00,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2019-11-06 22:43:00,620 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:43:00,620 INFO L410 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, 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] [2019-11-06 22:43:00,620 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:43:00,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:43:00,621 INFO L82 PathProgramCache]: Analyzing trace with hash 1426970602, now seen corresponding path program 1 times [2019-11-06 22:43:00,621 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:43:00,621 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693509730] [2019-11-06 22:43:00,622 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:43:00,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:43:00,898 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 59 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:43:00,899 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693509730] [2019-11-06 22:43:00,899 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:43:00,899 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:43:00,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200803950] [2019-11-06 22:43:00,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:43:00,900 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:43:00,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:43:00,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:43:00,901 INFO L87 Difference]: Start difference. First operand 447 states and 639 transitions. Second operand 6 states. [2019-11-06 22:43:01,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:43:01,729 INFO L93 Difference]: Finished difference Result 1206 states and 1783 transitions. [2019-11-06 22:43:01,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:43:01,730 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 192 [2019-11-06 22:43:01,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:43:01,735 INFO L225 Difference]: With dead ends: 1206 [2019-11-06 22:43:01,736 INFO L226 Difference]: Without dead ends: 765 [2019-11-06 22:43:01,737 INFO L630 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 [2019-11-06 22:43:01,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 765 states. [2019-11-06 22:43:01,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 765 to 749. [2019-11-06 22:43:01,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 749 states. [2019-11-06 22:43:01,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 749 states to 749 states and 1042 transitions. [2019-11-06 22:43:01,767 INFO L78 Accepts]: Start accepts. Automaton has 749 states and 1042 transitions. Word has length 192 [2019-11-06 22:43:01,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:43:01,768 INFO L462 AbstractCegarLoop]: Abstraction has 749 states and 1042 transitions. [2019-11-06 22:43:01,768 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:43:01,768 INFO L276 IsEmpty]: Start isEmpty. Operand 749 states and 1042 transitions. [2019-11-06 22:43:01,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2019-11-06 22:43:01,776 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:43:01,776 INFO L410 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, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:43:01,777 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:43:01,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:43:01,777 INFO L82 PathProgramCache]: Analyzing trace with hash 699242395, now seen corresponding path program 1 times [2019-11-06 22:43:01,777 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:43:01,778 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226246911] [2019-11-06 22:43:01,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:43:01,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:43:02,020 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 195 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:43:02,021 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226246911] [2019-11-06 22:43:02,022 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1200667511] [2019-11-06 22:43:02,024 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 [2019-11-06 22:43:02,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:43:02,147 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:43:02,171 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:43:02,279 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 195 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:43:02,279 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:43:02,462 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 195 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:43:02,462 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1789509903] [2019-11-06 22:43:02,471 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 271 [2019-11-06 22:43:02,533 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:43:02,533 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-06 22:43:14,388 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.