/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/Problem01_label55.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:31:57,692 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:31:57,695 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:31:57,714 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:31:57,737 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:31:57,740 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:31:57,742 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:31:57,745 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:31:57,746 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:31:57,747 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:31:57,749 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:31:57,750 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:31:57,753 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:31:57,754 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:31:57,755 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:31:57,755 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:31:57,760 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:31:57,773 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 22:31:57,774 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 22:31:57,774 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 22:31:57,775 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 22:31:57,788 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:31:57,789 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:31:57,790 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:31:57,790 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:31:57,790 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:31:57,790 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:31:57,791 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:31:57,791 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:31:57,791 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:31:57,791 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:31:57,791 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:31:57,792 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:31:57,792 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:31:57,792 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:31:57,792 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:31:57,792 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:31:57,793 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:31:57,793 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:31:57,793 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:31:57,793 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:31:57,793 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:31:57,794 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:31:57,794 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:31:57,794 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:31:57,794 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:31:57,795 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:31:57,795 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:31:57,795 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:31:57,795 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 22:31:58,069 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:31:58,082 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:31:58,086 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:31:58,087 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:31:58,088 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:31:58,088 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem01_label55.c [2019-11-06 22:31:58,160 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07d3e9f9e/1d47caf242904139a4d560b603d4fa2d/FLAG635882bfd [2019-11-06 22:31:58,738 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:31:58,739 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem01_label55.c [2019-11-06 22:31:58,754 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07d3e9f9e/1d47caf242904139a4d560b603d4fa2d/FLAG635882bfd [2019-11-06 22:31:59,016 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/07d3e9f9e/1d47caf242904139a4d560b603d4fa2d [2019-11-06 22:31:59,026 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:31:59,027 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:31:59,028 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:31:59,029 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:31:59,032 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:31:59,033 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,036 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2499cdd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59, skipping insertion in model container [2019-11-06 22:31:59,037 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,044 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:31:59,095 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:31:59,581 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:31:59,587 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:31:59,759 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:31:59,788 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:31:59,788 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59 WrapperNode [2019-11-06 22:31:59,789 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:31:59,790 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:31:59,790 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:31:59,791 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:31:59,808 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,809 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,853 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,854 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,928 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,934 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (1/1) ... [2019-11-06 22:31:59,942 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:31:59,943 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:31:59,943 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:31:59,943 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:31:59,944 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (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 22:32:00,015 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:32:00,016 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:32:00,016 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:32:00,016 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:32:00,016 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:32:00,017 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:32:00,017 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:32:00,017 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:32:00,018 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:32:00,018 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:32:00,018 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:32:01,219 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:32:01,222 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:32:01,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:32:01 BoogieIcfgContainer [2019-11-06 22:32:01,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:32:01,226 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:32:01,226 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:32:01,231 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:32:01,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:31:59" (1/3) ... [2019-11-06 22:32:01,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bb30111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:32:01, skipping insertion in model container [2019-11-06 22:32:01,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:31:59" (2/3) ... [2019-11-06 22:32:01,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6bb30111 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:32:01, skipping insertion in model container [2019-11-06 22:32:01,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:32:01" (3/3) ... [2019-11-06 22:32:01,244 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem01_label55.c [2019-11-06 22:32:01,255 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:32:01,266 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:32:01,278 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:32:01,319 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:32:01,320 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:32:01,320 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:32:01,320 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:32:01,321 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:32:01,321 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:32:01,321 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:32:01,321 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:32:01,360 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states. [2019-11-06 22:32:01,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-11-06 22:32:01,380 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:32:01,381 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:32:01,383 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:32:01,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:32:01,390 INFO L82 PathProgramCache]: Analyzing trace with hash -462333177, now seen corresponding path program 1 times [2019-11-06 22:32:01,400 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:32:01,400 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345697857] [2019-11-06 22:32:01,401 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:32:01,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:01,896 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 22:32:01,897 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345697857] [2019-11-06 22:32:01,898 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:32:01,899 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 22:32:01,901 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435144839] [2019-11-06 22:32:01,908 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:32:01,909 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:32:01,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:32:01,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:32:01,932 INFO L87 Difference]: Start difference. First operand 207 states. Second operand 3 states. [2019-11-06 22:32:02,933 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:32:02,935 INFO L93 Difference]: Finished difference Result 547 states and 938 transitions. [2019-11-06 22:32:02,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:32:02,936 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 117 [2019-11-06 22:32:02,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:32:02,968 INFO L225 Difference]: With dead ends: 547 [2019-11-06 22:32:02,968 INFO L226 Difference]: Without dead ends: 278 [2019-11-06 22:32:02,981 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 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 22:32:03,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2019-11-06 22:32:03,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 278. [2019-11-06 22:32:03,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 278 states. [2019-11-06 22:32:03,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 406 transitions. [2019-11-06 22:32:03,088 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 406 transitions. Word has length 117 [2019-11-06 22:32:03,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:32:03,090 INFO L462 AbstractCegarLoop]: Abstraction has 278 states and 406 transitions. [2019-11-06 22:32:03,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:32:03,091 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 406 transitions. [2019-11-06 22:32:03,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-11-06 22:32:03,103 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:32:03,104 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:32:03,105 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:32:03,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:32:03,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1604702730, now seen corresponding path program 1 times [2019-11-06 22:32:03,106 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:32:03,106 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [827531476] [2019-11-06 22:32:03,107 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:32:03,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:03,243 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:32:03,244 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [827531476] [2019-11-06 22:32:03,244 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:32:03,244 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 22:32:03,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805971789] [2019-11-06 22:32:03,246 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:32:03,247 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:32:03,247 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:32:03,247 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 22:32:03,248 INFO L87 Difference]: Start difference. First operand 278 states and 406 transitions. Second operand 5 states. [2019-11-06 22:32:04,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:32:04,021 INFO L93 Difference]: Finished difference Result 840 states and 1253 transitions. [2019-11-06 22:32:04,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:32:04,022 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 126 [2019-11-06 22:32:04,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:32:04,028 INFO L225 Difference]: With dead ends: 840 [2019-11-06 22:32:04,028 INFO L226 Difference]: Without dead ends: 568 [2019-11-06 22:32:04,030 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-11-06 22:32:04,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2019-11-06 22:32:04,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 558. [2019-11-06 22:32:04,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 558 states. [2019-11-06 22:32:04,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 558 states to 558 states and 788 transitions. [2019-11-06 22:32:04,062 INFO L78 Accepts]: Start accepts. Automaton has 558 states and 788 transitions. Word has length 126 [2019-11-06 22:32:04,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:32:04,063 INFO L462 AbstractCegarLoop]: Abstraction has 558 states and 788 transitions. [2019-11-06 22:32:04,063 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:32:04,063 INFO L276 IsEmpty]: Start isEmpty. Operand 558 states and 788 transitions. [2019-11-06 22:32:04,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2019-11-06 22:32:04,066 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:32:04,066 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 22:32:04,067 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:32:04,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:32:04,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1555807011, now seen corresponding path program 1 times [2019-11-06 22:32:04,067 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:32:04,068 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781331228] [2019-11-06 22:32:04,068 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:32:04,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:04,232 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:32:04,232 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781331228] [2019-11-06 22:32:04,233 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266594860] [2019-11-06 22:32:04,233 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 22:32:04,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:04,373 INFO L256 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:32:04,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:32:04,470 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 22:32:04,470 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:32:04,563 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 22:32:04,564 INFO L218 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-11-06 22:32:04,564 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2019-11-06 22:32:04,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136384996] [2019-11-06 22:32:04,567 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:32:04,571 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:32:04,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:32:04,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-06 22:32:04,572 INFO L87 Difference]: Start difference. First operand 558 states and 788 transitions. Second operand 3 states. [2019-11-06 22:32:05,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:32:05,132 INFO L93 Difference]: Finished difference Result 1660 states and 2405 transitions. [2019-11-06 22:32:05,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:32:05,133 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 137 [2019-11-06 22:32:05,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:32:05,141 INFO L225 Difference]: With dead ends: 1660 [2019-11-06 22:32:05,142 INFO L226 Difference]: Without dead ends: 1108 [2019-11-06 22:32:05,144 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 272 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-11-06 22:32:05,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1108 states. [2019-11-06 22:32:05,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1108 to 836. [2019-11-06 22:32:05,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 836 states. [2019-11-06 22:32:05,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 836 states to 836 states and 1162 transitions. [2019-11-06 22:32:05,185 INFO L78 Accepts]: Start accepts. Automaton has 836 states and 1162 transitions. Word has length 137 [2019-11-06 22:32:05,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:32:05,186 INFO L462 AbstractCegarLoop]: Abstraction has 836 states and 1162 transitions. [2019-11-06 22:32:05,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:32:05,187 INFO L276 IsEmpty]: Start isEmpty. Operand 836 states and 1162 transitions. [2019-11-06 22:32:05,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2019-11-06 22:32:05,190 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:32:05,190 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:32:05,396 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:32:05,396 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:32:05,397 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:32:05,397 INFO L82 PathProgramCache]: Analyzing trace with hash -879876428, now seen corresponding path program 1 times [2019-11-06 22:32:05,398 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:32:05,399 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1819159750] [2019-11-06 22:32:05,399 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:32:05,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:05,594 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:32:05,595 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1819159750] [2019-11-06 22:32:05,595 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:32:05,595 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:32:05,595 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361125310] [2019-11-06 22:32:05,596 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:32:05,596 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:32:05,596 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:32:05,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:32:05,597 INFO L87 Difference]: Start difference. First operand 836 states and 1162 transitions. Second operand 6 states. [2019-11-06 22:32:06,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:32:06,383 INFO L93 Difference]: Finished difference Result 2238 states and 3188 transitions. [2019-11-06 22:32:06,388 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:32:06,388 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 145 [2019-11-06 22:32:06,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:32:06,396 INFO L225 Difference]: With dead ends: 2238 [2019-11-06 22:32:06,397 INFO L226 Difference]: Without dead ends: 1408 [2019-11-06 22:32:06,399 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 22:32:06,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1408 states. [2019-11-06 22:32:06,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1408 to 1398. [2019-11-06 22:32:06,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1398 states. [2019-11-06 22:32:06,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1398 states to 1398 states and 1897 transitions. [2019-11-06 22:32:06,445 INFO L78 Accepts]: Start accepts. Automaton has 1398 states and 1897 transitions. Word has length 145 [2019-11-06 22:32:06,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:32:06,445 INFO L462 AbstractCegarLoop]: Abstraction has 1398 states and 1897 transitions. [2019-11-06 22:32:06,445 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:32:06,445 INFO L276 IsEmpty]: Start isEmpty. Operand 1398 states and 1897 transitions. [2019-11-06 22:32:06,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-11-06 22:32:06,451 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:32:06,451 INFO L410 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:32:06,451 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:32:06,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:32:06,452 INFO L82 PathProgramCache]: Analyzing trace with hash 792956155, now seen corresponding path program 1 times [2019-11-06 22:32:06,452 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:32:06,452 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138097690] [2019-11-06 22:32:06,452 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:32:06,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:06,574 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:32:06,575 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138097690] [2019-11-06 22:32:06,575 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [56702086] [2019-11-06 22:32:06,576 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 22:32:06,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:32:06,687 INFO L256 TraceCheckSpWp]: Trace formula consists of 441 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:32:06,703 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:32:06,766 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:32:06,767 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:32:06,911 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:32:06,911 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [661430206] [2019-11-06 22:32:06,919 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 157 [2019-11-06 22:32:07,007 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:32:07,008 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2)