/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/Problem18_label18.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:57:04,638 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:57:04,641 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:57:04,652 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:57:04,662 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:57:04,663 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:57:04,664 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:57:04,667 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:57:04,668 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:57:04,669 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:57:04,672 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:57:04,674 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:57:04,678 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:57:04,681 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:57:04,683 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:57:04,684 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:57:04,689 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:57:04,703 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:57:04,705 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:57:04,706 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:57:04,707 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 22:57:04,726 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:57:04,727 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:57:04,728 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:57:04,728 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:57:04,729 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:57:04,729 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:57:04,729 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:57:04,729 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:57:04,729 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:57:04,730 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:57:04,731 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:57:04,731 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:57:04,731 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:57:04,731 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:57:04,732 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:57:04,732 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:57:04,732 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:57:04,732 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:57:04,732 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:57:04,732 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:57:04,733 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:57:04,733 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:57:04,733 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:57:04,734 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:57:04,734 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:57:04,734 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:57:04,734 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:57:04,734 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:57:04,734 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 22:57:05,011 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:57:05,030 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:57:05,034 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:57:05,036 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:57:05,036 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:57:05,037 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem18_label18.c [2019-11-06 22:57:05,114 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86127a447/685f27cac1704059b49d7280a7050ddc/FLAG84312db14 [2019-11-06 22:57:05,812 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:57:05,812 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem18_label18.c [2019-11-06 22:57:05,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86127a447/685f27cac1704059b49d7280a7050ddc/FLAG84312db14 [2019-11-06 22:57:06,007 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/86127a447/685f27cac1704059b49d7280a7050ddc [2019-11-06 22:57:06,015 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:57:06,017 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:57:06,018 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:57:06,018 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:57:06,021 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:57:06,022 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:57:06" (1/1) ... [2019-11-06 22:57:06,025 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@40f8a51a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:06, skipping insertion in model container [2019-11-06 22:57:06,026 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:57:06" (1/1) ... [2019-11-06 22:57:06,033 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:57:06,160 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:57:07,286 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:57:07,297 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:57:07,822 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:57:07,850 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:57:07,850 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07 WrapperNode [2019-11-06 22:57:07,851 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:57:07,852 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:57:07,852 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:57:07,852 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:57:07,867 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:07,868 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:07,924 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:07,926 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:08,005 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:08,042 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:08,060 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (1/1) ... [2019-11-06 22:57:08,154 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:57:08,154 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:57:08,155 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:57:08,155 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:57:08,156 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (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 22:57:08,222 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:57:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:57:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:57:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2019-11-06 22:57:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2019-11-06 22:57:08,223 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:57:08,224 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:57:08,224 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2019-11-06 22:57:08,224 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2019-11-06 22:57:08,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:57:08,224 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:57:08,224 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:57:08,225 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:57:08,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:57:08,225 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:57:11,879 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:57:11,879 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:57:11,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:57:11 BoogieIcfgContainer [2019-11-06 22:57:11,885 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:57:11,886 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:57:11,886 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:57:11,891 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:57:11,891 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:57:06" (1/3) ... [2019-11-06 22:57:11,892 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43c5bde8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:57:11, skipping insertion in model container [2019-11-06 22:57:11,892 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:57:07" (2/3) ... [2019-11-06 22:57:11,893 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43c5bde8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:57:11, skipping insertion in model container [2019-11-06 22:57:11,893 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:57:11" (3/3) ... [2019-11-06 22:57:11,898 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem18_label18.c [2019-11-06 22:57:11,912 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:57:11,922 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:57:11,934 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:57:11,967 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:57:11,967 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:57:11,967 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:57:11,967 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:57:11,968 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:57:11,968 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:57:11,968 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:57:11,968 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:57:12,004 INFO L276 IsEmpty]: Start isEmpty. Operand 774 states. [2019-11-06 22:57:12,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-11-06 22:57:12,013 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:57:12,014 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] [2019-11-06 22:57:12,016 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:57:12,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:57:12,022 INFO L82 PathProgramCache]: Analyzing trace with hash 269272858, now seen corresponding path program 1 times [2019-11-06 22:57:12,031 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:57:12,032 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477694122] [2019-11-06 22:57:12,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:57:12,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:12,386 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 22:57:12,386 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477694122] [2019-11-06 22:57:12,387 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:57:12,388 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 22:57:12,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234445583] [2019-11-06 22:57:12,394 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:57:12,396 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:57:12,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:57:12,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:57:12,414 INFO L87 Difference]: Start difference. First operand 774 states. Second operand 3 states. [2019-11-06 22:57:16,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:57:16,818 INFO L93 Difference]: Finished difference Result 2248 states and 4319 transitions. [2019-11-06 22:57:16,821 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:57:16,823 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 63 [2019-11-06 22:57:16,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:57:16,860 INFO L225 Difference]: With dead ends: 2248 [2019-11-06 22:57:16,860 INFO L226 Difference]: Without dead ends: 1412 [2019-11-06 22:57:16,869 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:57:16,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1412 states. [2019-11-06 22:57:17,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1412 to 1412. [2019-11-06 22:57:17,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1412 states. [2019-11-06 22:57:17,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1412 states to 1412 states and 2630 transitions. [2019-11-06 22:57:17,017 INFO L78 Accepts]: Start accepts. Automaton has 1412 states and 2630 transitions. Word has length 63 [2019-11-06 22:57:17,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:57:17,018 INFO L462 AbstractCegarLoop]: Abstraction has 1412 states and 2630 transitions. [2019-11-06 22:57:17,018 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:57:17,018 INFO L276 IsEmpty]: Start isEmpty. Operand 1412 states and 2630 transitions. [2019-11-06 22:57:17,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2019-11-06 22:57:17,025 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:57:17,025 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:57:17,026 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:57:17,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:57:17,026 INFO L82 PathProgramCache]: Analyzing trace with hash 1668142983, now seen corresponding path program 1 times [2019-11-06 22:57:17,026 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:57:17,027 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762519796] [2019-11-06 22:57:17,027 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:57:17,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:17,236 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:57:17,237 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762519796] [2019-11-06 22:57:17,239 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:57:17,239 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:57:17,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896631310] [2019-11-06 22:57:17,240 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:57:17,241 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:57:17,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:57:17,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:57:17,241 INFO L87 Difference]: Start difference. First operand 1412 states and 2630 transitions. Second operand 6 states. [2019-11-06 22:57:22,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:57:22,689 INFO L93 Difference]: Finished difference Result 4288 states and 8023 transitions. [2019-11-06 22:57:22,689 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:57:22,689 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 152 [2019-11-06 22:57:22,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:57:22,708 INFO L225 Difference]: With dead ends: 4288 [2019-11-06 22:57:22,709 INFO L226 Difference]: Without dead ends: 2882 [2019-11-06 22:57:22,713 INFO L630 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 [2019-11-06 22:57:22,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2882 states. [2019-11-06 22:57:22,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2882 to 2858. [2019-11-06 22:57:22,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2858 states. [2019-11-06 22:57:22,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2858 states to 2858 states and 5137 transitions. [2019-11-06 22:57:22,823 INFO L78 Accepts]: Start accepts. Automaton has 2858 states and 5137 transitions. Word has length 152 [2019-11-06 22:57:22,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:57:22,824 INFO L462 AbstractCegarLoop]: Abstraction has 2858 states and 5137 transitions. [2019-11-06 22:57:22,824 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:57:22,824 INFO L276 IsEmpty]: Start isEmpty. Operand 2858 states and 5137 transitions. [2019-11-06 22:57:22,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-11-06 22:57:22,828 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:57:22,828 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:57:22,828 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:57:22,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:57:22,829 INFO L82 PathProgramCache]: Analyzing trace with hash 1811597990, now seen corresponding path program 1 times [2019-11-06 22:57:22,829 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:57:22,829 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760262920] [2019-11-06 22:57:22,830 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:57:22,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:22,983 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 56 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:57:22,984 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760262920] [2019-11-06 22:57:22,984 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:57:22,984 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:57:22,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235714764] [2019-11-06 22:57:22,985 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:57:22,985 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:57:22,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:57:22,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:57:22,986 INFO L87 Difference]: Start difference. First operand 2858 states and 5137 transitions. Second operand 6 states. [2019-11-06 22:57:32,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:57:32,587 INFO L93 Difference]: Finished difference Result 11626 states and 21824 transitions. [2019-11-06 22:57:32,588 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 22:57:32,588 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 153 [2019-11-06 22:57:32,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:57:32,641 INFO L225 Difference]: With dead ends: 11626 [2019-11-06 22:57:32,641 INFO L226 Difference]: Without dead ends: 8774 [2019-11-06 22:57:32,650 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2019-11-06 22:57:32,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8774 states. [2019-11-06 22:57:32,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8774 to 8718. [2019-11-06 22:57:32,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8718 states. [2019-11-06 22:57:32,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8718 states to 8718 states and 13633 transitions. [2019-11-06 22:57:32,932 INFO L78 Accepts]: Start accepts. Automaton has 8718 states and 13633 transitions. Word has length 153 [2019-11-06 22:57:32,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:57:32,932 INFO L462 AbstractCegarLoop]: Abstraction has 8718 states and 13633 transitions. [2019-11-06 22:57:32,933 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:57:32,933 INFO L276 IsEmpty]: Start isEmpty. Operand 8718 states and 13633 transitions. [2019-11-06 22:57:32,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2019-11-06 22:57:32,938 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:57:32,939 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, 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] [2019-11-06 22:57:32,939 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:57:32,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:57:32,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1951116309, now seen corresponding path program 1 times [2019-11-06 22:57:32,940 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:57:32,940 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046671838] [2019-11-06 22:57:32,940 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:57:32,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:33,131 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 112 proven. 65 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:57:33,131 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046671838] [2019-11-06 22:57:33,132 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659990236] [2019-11-06 22:57:33,132 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 22:57:33,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:33,271 INFO L256 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 22:57:33,288 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:57:33,429 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 124 proven. 0 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-11-06 22:57:33,429 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:57:33,679 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 112 proven. 65 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:57:33,680 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:57:33,680 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5, 5] total 10 [2019-11-06 22:57:33,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098994] [2019-11-06 22:57:33,682 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:57:33,682 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:57:33,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:57:33,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-11-06 22:57:33,684 INFO L87 Difference]: Start difference. First operand 8718 states and 13633 transitions. Second operand 5 states. [2019-11-06 22:57:39,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:57:39,243 INFO L93 Difference]: Finished difference Result 24212 states and 39085 transitions. [2019-11-06 22:57:39,244 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:57:39,244 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 222 [2019-11-06 22:57:39,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:57:39,341 INFO L225 Difference]: With dead ends: 24212 [2019-11-06 22:57:39,341 INFO L226 Difference]: Without dead ends: 15500 [2019-11-06 22:57:39,370 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 439 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2019-11-06 22:57:39,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15500 states. [2019-11-06 22:57:39,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15500 to 14625. [2019-11-06 22:57:39,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14625 states. [2019-11-06 22:57:39,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14625 states to 14625 states and 19388 transitions. [2019-11-06 22:57:39,786 INFO L78 Accepts]: Start accepts. Automaton has 14625 states and 19388 transitions. Word has length 222 [2019-11-06 22:57:39,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:57:39,787 INFO L462 AbstractCegarLoop]: Abstraction has 14625 states and 19388 transitions. [2019-11-06 22:57:39,788 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:57:39,788 INFO L276 IsEmpty]: Start isEmpty. Operand 14625 states and 19388 transitions. [2019-11-06 22:57:39,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2019-11-06 22:57:39,796 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:57:39,797 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:57:40,001 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:57:40,001 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:57:40,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:57:40,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1823337631, now seen corresponding path program 1 times [2019-11-06 22:57:40,002 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:57:40,002 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [905981164] [2019-11-06 22:57:40,002 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:57:40,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:40,479 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 239 proven. 69 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2019-11-06 22:57:40,481 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [905981164] [2019-11-06 22:57:40,482 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838661318] [2019-11-06 22:57:40,482 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 22:57:40,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:57:40,660 INFO L256 TraceCheckSpWp]: Trace formula consists of 568 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:57:40,685 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:57:40,826 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 337 proven. 2 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-11-06 22:57:40,827 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:57:40,961 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 239 proven. 69 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2019-11-06 22:57:40,961 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1179508788] [2019-11-06 22:57:40,967 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 345 [2019-11-06 22:57:41,015 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:57:41,016 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)