/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_label00.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 22:41:12,988 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 22:41:12,991 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 22:41:13,011 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 22:41:13,038 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 22:41:13,040 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 22:41:13,042 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 22:41:13,044 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 22:41:13,046 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 22:41:13,047 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 22:41:13,048 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 22:41:13,053 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 22:41:13,058 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 22:41:13,061 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 22:41:13,064 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 22:41:13,066 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 22:41:13,068 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 22:41:13,081 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 22:41:13,114 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 22:41:13,115 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 22:41:13,116 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 22:41:13,116 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 22:41:13,116 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 22:41:13,117 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 22:41:13,120 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 22:41:13,120 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 22:41:13,120 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 22:41:13,120 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 22:41:13,121 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 22:41:13,121 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 22:41:13,121 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 22:41:13,121 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 22:41:13,121 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 22:41:13,122 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 22:41:13,122 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 22:41:13,122 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 22:41:13,122 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 22:41:13,122 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 22:41:13,123 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 22:41:13,126 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 22:41:13,126 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 22:41:13,127 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 22:41:13,127 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 22:41:13,127 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 22:41:13,127 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 22:41:13,127 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 22:41:13,128 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 22:41:13,447 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 22:41:13,466 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 22:41:13,470 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 22:41:13,471 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 22:41:13,472 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 22:41:13,473 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem10_label00.c [2019-11-06 22:41:13,554 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbee6f9b7/c97b88f0d4464960a179536be1d7439a/FLAG8714ae601 [2019-11-06 22:41:14,084 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 22:41:14,085 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem10_label00.c [2019-11-06 22:41:14,102 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbee6f9b7/c97b88f0d4464960a179536be1d7439a/FLAG8714ae601 [2019-11-06 22:41:14,341 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bbee6f9b7/c97b88f0d4464960a179536be1d7439a [2019-11-06 22:41:14,349 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 22:41:14,350 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 22:41:14,351 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 22:41:14,351 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 22:41:14,355 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 22:41:14,356 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:41:14" (1/1) ... [2019-11-06 22:41:14,359 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f3f1635 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:14, skipping insertion in model container [2019-11-06 22:41:14,359 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:41:14" (1/1) ... [2019-11-06 22:41:14,366 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 22:41:14,424 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 22:41:15,025 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:41:15,030 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 22:41:15,137 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 22:41:15,156 INFO L192 MainTranslator]: Completed translation [2019-11-06 22:41:15,157 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15 WrapperNode [2019-11-06 22:41:15,157 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 22:41:15,158 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 22:41:15,158 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 22:41:15,158 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 22:41:15,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,202 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,203 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,250 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,276 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,285 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (1/1) ... [2019-11-06 22:41:15,294 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 22:41:15,295 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 22:41:15,295 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 22:41:15,295 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 22:41:15,296 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (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 22:41:15,383 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 22:41:15,384 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 22:41:15,384 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 22:41:15,384 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 22:41:15,385 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 22:41:15,385 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 22:41:15,386 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 22:41:15,387 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 22:41:15,387 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 22:41:15,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 22:41:15,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 22:41:16,639 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 22:41:16,639 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 22:41:16,645 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:41:16 BoogieIcfgContainer [2019-11-06 22:41:16,646 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 22:41:16,647 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 22:41:16,647 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 22:41:16,654 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 22:41:16,654 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:41:14" (1/3) ... [2019-11-06 22:41:16,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e6504bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:41:16, skipping insertion in model container [2019-11-06 22:41:16,656 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:41:15" (2/3) ... [2019-11-06 22:41:16,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e6504bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:41:16, skipping insertion in model container [2019-11-06 22:41:16,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:41:16" (3/3) ... [2019-11-06 22:41:16,663 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem10_label00.c [2019-11-06 22:41:16,680 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 22:41:16,691 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 22:41:16,706 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 22:41:16,748 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 22:41:16,748 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 22:41:16,750 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 22:41:16,751 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 22:41:16,751 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 22:41:16,751 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 22:41:16,751 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 22:41:16,751 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 22:41:16,781 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states. [2019-11-06 22:41:16,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 22:41:16,793 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:41:16,794 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] [2019-11-06 22:41:16,796 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:41:16,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:41:16,802 INFO L82 PathProgramCache]: Analyzing trace with hash 446326894, now seen corresponding path program 1 times [2019-11-06 22:41:16,811 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:41:16,812 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1023980531] [2019-11-06 22:41:16,812 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:41:16,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:17,152 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 22:41:17,153 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1023980531] [2019-11-06 22:41:17,154 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:41:17,154 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 22:41:17,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733477174] [2019-11-06 22:41:17,162 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 22:41:17,164 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:41:17,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 22:41:17,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 22:41:17,183 INFO L87 Difference]: Start difference. First operand 215 states. Second operand 3 states. [2019-11-06 22:41:18,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:41:18,139 INFO L93 Difference]: Finished difference Result 571 states and 989 transitions. [2019-11-06 22:41:18,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 22:41:18,145 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 53 [2019-11-06 22:41:18,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:41:18,171 INFO L225 Difference]: With dead ends: 571 [2019-11-06 22:41:18,171 INFO L226 Difference]: Without dead ends: 294 [2019-11-06 22:41:18,183 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 22:41:18,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2019-11-06 22:41:18,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 294. [2019-11-06 22:41:18,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2019-11-06 22:41:18,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 446 transitions. [2019-11-06 22:41:18,288 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 446 transitions. Word has length 53 [2019-11-06 22:41:18,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:41:18,289 INFO L462 AbstractCegarLoop]: Abstraction has 294 states and 446 transitions. [2019-11-06 22:41:18,289 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 22:41:18,289 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 446 transitions. [2019-11-06 22:41:18,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2019-11-06 22:41:18,297 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:41:18,297 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:41:18,297 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:41:18,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:41:18,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1014912959, now seen corresponding path program 1 times [2019-11-06 22:41:18,298 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:41:18,298 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22004290] [2019-11-06 22:41:18,299 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:41:18,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:18,601 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:41:18,603 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22004290] [2019-11-06 22:41:18,603 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:41:18,603 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 22:41:18,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474231993] [2019-11-06 22:41:18,606 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 22:41:18,606 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:41:18,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 22:41:18,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:41:18,607 INFO L87 Difference]: Start difference. First operand 294 states and 446 transitions. Second operand 4 states. [2019-11-06 22:41:19,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:41:19,888 INFO L93 Difference]: Finished difference Result 1154 states and 1790 transitions. [2019-11-06 22:41:19,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 22:41:19,888 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 172 [2019-11-06 22:41:19,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:41:19,897 INFO L225 Difference]: With dead ends: 1154 [2019-11-06 22:41:19,898 INFO L226 Difference]: Without dead ends: 866 [2019-11-06 22:41:19,899 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-11-06 22:41:19,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 866 states. [2019-11-06 22:41:19,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 866 to 723. [2019-11-06 22:41:19,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 723 states. [2019-11-06 22:41:19,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 723 states to 723 states and 1036 transitions. [2019-11-06 22:41:19,958 INFO L78 Accepts]: Start accepts. Automaton has 723 states and 1036 transitions. Word has length 172 [2019-11-06 22:41:19,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:41:19,959 INFO L462 AbstractCegarLoop]: Abstraction has 723 states and 1036 transitions. [2019-11-06 22:41:19,959 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 22:41:19,959 INFO L276 IsEmpty]: Start isEmpty. Operand 723 states and 1036 transitions. [2019-11-06 22:41:19,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 180 [2019-11-06 22:41:19,965 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:41:19,970 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 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 22:41:19,970 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:41:19,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:41:19,971 INFO L82 PathProgramCache]: Analyzing trace with hash -1103795558, now seen corresponding path program 1 times [2019-11-06 22:41:19,971 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:41:19,971 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59689901] [2019-11-06 22:41:19,971 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:41:20,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:20,222 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:41:20,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59689901] [2019-11-06 22:41:20,223 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 22:41:20,223 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-11-06 22:41:20,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335324284] [2019-11-06 22:41:20,224 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 22:41:20,224 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:41:20,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 22:41:20,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 22:41:20,225 INFO L87 Difference]: Start difference. First operand 723 states and 1036 transitions. Second operand 6 states. [2019-11-06 22:41:21,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:41:21,258 INFO L93 Difference]: Finished difference Result 1613 states and 2361 transitions. [2019-11-06 22:41:21,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 22:41:21,259 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 179 [2019-11-06 22:41:21,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:41:21,265 INFO L225 Difference]: With dead ends: 1613 [2019-11-06 22:41:21,265 INFO L226 Difference]: Without dead ends: 896 [2019-11-06 22:41:21,267 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 22:41:21,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 896 states. [2019-11-06 22:41:21,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 896 to 880. [2019-11-06 22:41:21,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 880 states. [2019-11-06 22:41:21,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 880 states to 880 states and 1167 transitions. [2019-11-06 22:41:21,302 INFO L78 Accepts]: Start accepts. Automaton has 880 states and 1167 transitions. Word has length 179 [2019-11-06 22:41:21,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:41:21,303 INFO L462 AbstractCegarLoop]: Abstraction has 880 states and 1167 transitions. [2019-11-06 22:41:21,303 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 22:41:21,303 INFO L276 IsEmpty]: Start isEmpty. Operand 880 states and 1167 transitions. [2019-11-06 22:41:21,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2019-11-06 22:41:21,310 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:41:21,311 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, 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] [2019-11-06 22:41:21,311 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:41:21,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:41:21,312 INFO L82 PathProgramCache]: Analyzing trace with hash -630428119, now seen corresponding path program 1 times [2019-11-06 22:41:21,312 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:41:21,312 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503678492] [2019-11-06 22:41:21,312 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:41:21,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:21,596 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 92 proven. 65 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:41:21,597 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503678492] [2019-11-06 22:41:21,597 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1338019109] [2019-11-06 22:41:21,597 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 22:41:21,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:21,754 INFO L256 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 22:41:21,768 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:41:21,924 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 114 proven. 0 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2019-11-06 22:41:21,924 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:41:22,096 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 92 proven. 65 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 22:41:22,097 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2019-11-06 22:41:22,097 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 12 [2019-11-06 22:41:22,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669681745] [2019-11-06 22:41:22,098 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 22:41:22,099 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-11-06 22:41:22,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 22:41:22,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-11-06 22:41:22,099 INFO L87 Difference]: Start difference. First operand 880 states and 1167 transitions. Second operand 5 states. [2019-11-06 22:41:23,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 22:41:23,037 INFO L93 Difference]: Finished difference Result 2382 states and 3298 transitions. [2019-11-06 22:41:23,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 22:41:23,038 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 248 [2019-11-06 22:41:23,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 22:41:23,050 INFO L225 Difference]: With dead ends: 2382 [2019-11-06 22:41:23,050 INFO L226 Difference]: Without dead ends: 1508 [2019-11-06 22:41:23,059 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 503 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2019-11-06 22:41:23,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1508 states. [2019-11-06 22:41:23,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1508 to 1337. [2019-11-06 22:41:23,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1337 states. [2019-11-06 22:41:23,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1337 states to 1337 states and 1777 transitions. [2019-11-06 22:41:23,109 INFO L78 Accepts]: Start accepts. Automaton has 1337 states and 1777 transitions. Word has length 248 [2019-11-06 22:41:23,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 22:41:23,110 INFO L462 AbstractCegarLoop]: Abstraction has 1337 states and 1777 transitions. [2019-11-06 22:41:23,110 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 22:41:23,110 INFO L276 IsEmpty]: Start isEmpty. Operand 1337 states and 1777 transitions. [2019-11-06 22:41:23,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 259 [2019-11-06 22:41:23,116 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 22:41:23,117 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, 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] [2019-11-06 22:41:23,320 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 22:41:23,320 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 22:41:23,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 22:41:23,321 INFO L82 PathProgramCache]: Analyzing trace with hash 144192093, now seen corresponding path program 1 times [2019-11-06 22:41:23,321 INFO L161 FreeRefinementEngine]: Executing refinement strategy TAIPAN [2019-11-06 22:41:23,322 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507661481] [2019-11-06 22:41:23,322 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 22:41:23,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:23,574 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 169 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:41:23,575 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507661481] [2019-11-06 22:41:23,575 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257804189] [2019-11-06 22:41:23,575 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 22:41:23,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 22:41:23,674 INFO L256 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 22:41:23,691 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 22:41:23,816 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 169 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:41:23,817 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-06 22:41:23,949 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 169 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 22:41:23,950 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [2115908550] [2019-11-06 22:41:23,956 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 259 [2019-11-06 22:41:24,021 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-11-06 22:41:24,021 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-11-06 22:41:36,121 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.