/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 --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/sanfoundry_02_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:20:08,086 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:20:08,136 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:20:08,139 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:20:08,140 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:20:08,141 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:20:08,142 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:20:08,143 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:20:08,147 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:20:08,153 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:20:08,156 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:20:08,158 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:20:08,161 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:20:08,162 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:20:08,164 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:20:08,171 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:20:08,172 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:20:08,173 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:20:08,174 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 [2019-11-07 01:20:08,188 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:20:08,189 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:20:08,191 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:20:08,191 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:20:08,192 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:20:08,192 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:20:08,192 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:20:08,192 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:20:08,193 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:20:08,193 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:20:08,193 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:20:08,193 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:20:08,193 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:20:08,194 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:20:08,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:20:08,194 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:20:08,194 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:20:08,194 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:20:08,195 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:20:08,196 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:20:08,196 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:20:08,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:20:08,197 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:20:08,197 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:20:08,197 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:20:08,197 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:20:08,197 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:20:08,198 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:20:08,198 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-11-07 01:20:08,479 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:20:08,493 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:20:08,497 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:20:08,498 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:20:08,499 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:20:08,500 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sanfoundry_02_ground.i [2019-11-07 01:20:08,568 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b893dba1/590d4a94db0a4eff8f46b5f70f3dac0e/FLAG60f0c2176 [2019-11-07 01:20:09,041 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:20:09,042 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sanfoundry_02_ground.i [2019-11-07 01:20:09,051 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b893dba1/590d4a94db0a4eff8f46b5f70f3dac0e/FLAG60f0c2176 [2019-11-07 01:20:09,441 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7b893dba1/590d4a94db0a4eff8f46b5f70f3dac0e [2019-11-07 01:20:09,469 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:20:09,473 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:20:09,479 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:20:09,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:20:09,486 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:20:09,492 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:09,498 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d184af9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09, skipping insertion in model container [2019-11-07 01:20:09,498 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:09,517 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:20:09,567 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:20:09,864 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:20:09,868 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:20:09,892 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:20:09,910 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:20:09,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09 WrapperNode [2019-11-07 01:20:09,911 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:20:09,912 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:20:09,912 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:20:09,912 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:20:10,014 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,014 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,025 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,043 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,050 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,051 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (1/1) ... [2019-11-07 01:20:10,054 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:20:10,055 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:20:10,055 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:20:10,055 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:20:10,056 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (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 [2019-11-07 01:20:10,113 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:20:10,113 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:20:10,114 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:20:10,114 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:20:10,114 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:20:10,114 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:20:10,114 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:20:10,114 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:20:10,115 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:20:10,115 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:20:10,115 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:20:10,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:20:10,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:20:10,115 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:20:10,649 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:20:10,650 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-07 01:20:10,652 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:20:10 BoogieIcfgContainer [2019-11-07 01:20:10,652 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:20:10,654 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:20:10,654 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:20:10,657 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:20:10,658 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:20:09" (1/3) ... [2019-11-07 01:20:10,659 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46c0590d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:20:10, skipping insertion in model container [2019-11-07 01:20:10,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:20:09" (2/3) ... [2019-11-07 01:20:10,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@46c0590d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:20:10, skipping insertion in model container [2019-11-07 01:20:10,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:20:10" (3/3) ... [2019-11-07 01:20:10,663 INFO L109 eAbstractionObserver]: Analyzing ICFG sanfoundry_02_ground.i [2019-11-07 01:20:10,675 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:20:10,685 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:20:10,695 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:20:10,721 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:20:10,721 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:20:10,721 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:20:10,722 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:20:10,722 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:20:10,722 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:20:10,722 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:20:10,722 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:20:10,742 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-11-07 01:20:10,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-11-07 01:20:10,750 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:10,751 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:10,754 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:10,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:10,759 INFO L82 PathProgramCache]: Analyzing trace with hash -556049670, now seen corresponding path program 1 times [2019-11-07 01:20:10,768 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:10,768 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325637161] [2019-11-07 01:20:10,769 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:10,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:10,972 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-07 01:20:10,973 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325637161] [2019-11-07 01:20:10,974 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:20:10,975 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:20:10,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025633591] [2019-11-07 01:20:10,984 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:20:10,985 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:11,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:20:11,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:20:11,008 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2019-11-07 01:20:11,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:11,078 INFO L93 Difference]: Finished difference Result 39 states and 51 transitions. [2019-11-07 01:20:11,079 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:20:11,081 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-11-07 01:20:11,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:11,095 INFO L225 Difference]: With dead ends: 39 [2019-11-07 01:20:11,096 INFO L226 Difference]: Without dead ends: 20 [2019-11-07 01:20:11,105 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:20:11,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-07 01:20:11,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-07 01:20:11,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-07 01:20:11,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2019-11-07 01:20:11,172 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 12 [2019-11-07 01:20:11,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:11,174 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2019-11-07 01:20:11,174 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:20:11,175 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2019-11-07 01:20:11,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-11-07 01:20:11,179 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:11,179 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:11,180 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:11,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:11,181 INFO L82 PathProgramCache]: Analyzing trace with hash -275638623, now seen corresponding path program 1 times [2019-11-07 01:20:11,181 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:11,182 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409271818] [2019-11-07 01:20:11,182 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:11,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:11,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:20:11,272 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409271818] [2019-11-07 01:20:11,273 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:20:11,273 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:20:11,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579611565] [2019-11-07 01:20:11,275 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:20:11,276 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:11,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:20:11,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:20:11,277 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand 3 states. [2019-11-07 01:20:11,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:11,298 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2019-11-07 01:20:11,299 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:20:11,299 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-11-07 01:20:11,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:11,301 INFO L225 Difference]: With dead ends: 33 [2019-11-07 01:20:11,301 INFO L226 Difference]: Without dead ends: 21 [2019-11-07 01:20:11,302 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:20:11,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-11-07 01:20:11,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-11-07 01:20:11,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-11-07 01:20:11,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-11-07 01:20:11,309 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2019-11-07 01:20:11,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:11,310 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-11-07 01:20:11,310 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:20:11,310 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-11-07 01:20:11,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:20:11,311 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:11,311 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:11,312 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:11,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:11,312 INFO L82 PathProgramCache]: Analyzing trace with hash -1658314951, now seen corresponding path program 1 times [2019-11-07 01:20:11,312 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:11,313 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [823359575] [2019-11-07 01:20:11,313 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:11,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:11,362 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:20:11,362 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [823359575] [2019-11-07 01:20:11,363 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880023171] [2019-11-07 01:20:11,363 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 [2019-11-07 01:20:11,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:11,418 INFO L256 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:20:11,425 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:11,463 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:20:11,464 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:11,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-07 01:20:11,504 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2136083299] [2019-11-07 01:20:11,534 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:20:11,534 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:11,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:11,550 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:11,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:11,713 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:11,956 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:20:11,970 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:11,973 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:12,248 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:12,249 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:20:12,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198956834] [2019-11-07 01:20:12,252 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:20:12,253 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:12,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:20:12,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:20:12,255 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 18 states. [2019-11-07 01:20:13,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:13,008 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2019-11-07 01:20:13,008 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-07 01:20:13,008 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 14 [2019-11-07 01:20:13,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:13,009 INFO L225 Difference]: With dead ends: 46 [2019-11-07 01:20:13,010 INFO L226 Difference]: Without dead ends: 32 [2019-11-07 01:20:13,011 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=211, Invalid=979, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:20:13,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-07 01:20:13,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2019-11-07 01:20:13,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-07 01:20:13,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2019-11-07 01:20:13,022 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 14 [2019-11-07 01:20:13,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:13,022 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2019-11-07 01:20:13,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:20:13,023 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2019-11-07 01:20:13,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-07 01:20:13,024 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:13,024 INFO L410 BasicCegarLoop]: trace histogram [6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:13,227 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:13,228 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:13,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:13,228 INFO L82 PathProgramCache]: Analyzing trace with hash -716975334, now seen corresponding path program 2 times [2019-11-07 01:20:13,229 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:13,229 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882080153] [2019-11-07 01:20:13,229 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:13,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:13,337 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:20:13,338 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882080153] [2019-11-07 01:20:13,338 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359049440] [2019-11-07 01:20:13,339 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-07 01:20:13,399 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-07 01:20:13,399 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:20:13,401 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:20:13,403 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:13,422 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:20:13,423 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:13,506 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-07 01:20:13,507 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [349945409] [2019-11-07 01:20:13,508 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:20:13,508 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:13,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:13,509 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:13,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:13,536 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:13,654 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:20:13,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:13,663 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:13,876 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:13,877 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 11] total 22 [2019-11-07 01:20:13,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293307592] [2019-11-07 01:20:13,878 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-07 01:20:13,878 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:13,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-07 01:20:13,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2019-11-07 01:20:13,879 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand 22 states. [2019-11-07 01:20:14,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:14,876 INFO L93 Difference]: Finished difference Result 60 states and 78 transitions. [2019-11-07 01:20:14,877 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-11-07 01:20:14,877 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2019-11-07 01:20:14,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:14,878 INFO L225 Difference]: With dead ends: 60 [2019-11-07 01:20:14,878 INFO L226 Difference]: Without dead ends: 42 [2019-11-07 01:20:14,880 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=484, Invalid=1868, Unknown=0, NotChecked=0, Total=2352 [2019-11-07 01:20:14,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-07 01:20:14,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-11-07 01:20:14,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-07 01:20:14,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-11-07 01:20:14,890 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 22 [2019-11-07 01:20:14,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:14,890 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-11-07 01:20:14,890 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-07 01:20:14,890 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-11-07 01:20:14,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-07 01:20:14,891 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:14,891 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:15,104 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:15,104 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:15,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:15,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1055620890, now seen corresponding path program 3 times [2019-11-07 01:20:15,105 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:15,105 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1463600633] [2019-11-07 01:20:15,106 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:15,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:15,324 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-07 01:20:15,324 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1463600633] [2019-11-07 01:20:15,324 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590752195] [2019-11-07 01:20:15,324 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:15,405 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:20:15,406 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:20:15,407 INFO L256 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 01:20:15,409 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:15,428 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-07 01:20:15,429 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:15,656 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-07 01:20:15,656 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000393833] [2019-11-07 01:20:15,658 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:20:15,658 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:15,659 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:15,659 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:15,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:15,681 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:15,756 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:20:15,763 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:15,768 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:16,081 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:16,082 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 36 [2019-11-07 01:20:16,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858014098] [2019-11-07 01:20:16,083 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-11-07 01:20:16,083 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:16,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-11-07 01:20:16,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=354, Invalid=906, Unknown=0, NotChecked=0, Total=1260 [2019-11-07 01:20:16,085 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 36 states. [2019-11-07 01:20:18,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:18,251 INFO L93 Difference]: Finished difference Result 92 states and 126 transitions. [2019-11-07 01:20:18,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2019-11-07 01:20:18,252 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 32 [2019-11-07 01:20:18,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:18,254 INFO L225 Difference]: With dead ends: 92 [2019-11-07 01:20:18,254 INFO L226 Difference]: Without dead ends: 68 [2019-11-07 01:20:18,258 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2223 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1903, Invalid=5929, Unknown=0, NotChecked=0, Total=7832 [2019-11-07 01:20:18,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-07 01:20:18,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2019-11-07 01:20:18,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-07 01:20:18,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2019-11-07 01:20:18,274 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 32 [2019-11-07 01:20:18,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:18,275 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2019-11-07 01:20:18,275 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-11-07 01:20:18,275 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2019-11-07 01:20:18,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-07 01:20:18,276 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:18,277 INFO L410 BasicCegarLoop]: trace histogram [24, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:18,480 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:18,481 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:18,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:18,481 INFO L82 PathProgramCache]: Analyzing trace with hash -171811398, now seen corresponding path program 4 times [2019-11-07 01:20:18,482 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:18,482 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346125514] [2019-11-07 01:20:18,483 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:18,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:19,057 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-11-07 01:20:19,058 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346125514] [2019-11-07 01:20:19,058 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383820720] [2019-11-07 01:20:19,059 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:19,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:19,204 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-07 01:20:19,216 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:19,264 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-07 01:20:19,264 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:20:20,161 INFO L134 CoverageAnalysis]: Checked inductivity of 553 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-07 01:20:20,162 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1885439742] [2019-11-07 01:20:20,163 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-11-07 01:20:20,163 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:20:20,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:20:20,164 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:20:20,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:20:20,190 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:20:20,259 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-11-07 01:20:20,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:20:20,268 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:20:20,588 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:20:20,588 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 27, 27, 11] total 62 [2019-11-07 01:20:20,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516136037] [2019-11-07 01:20:20,590 INFO L442 AbstractCegarLoop]: Interpolant automaton has 62 states [2019-11-07 01:20:20,591 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:20:20,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2019-11-07 01:20:20,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1355, Invalid=2427, Unknown=0, NotChecked=0, Total=3782 [2019-11-07 01:20:20,598 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 62 states. [2019-11-07 01:20:26,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:20:26,428 INFO L93 Difference]: Finished difference Result 156 states and 216 transitions. [2019-11-07 01:20:26,429 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2019-11-07 01:20:26,430 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 58 [2019-11-07 01:20:26,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:20:26,432 INFO L225 Difference]: With dead ends: 156 [2019-11-07 01:20:26,432 INFO L226 Difference]: Without dead ends: 120 [2019-11-07 01:20:26,441 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7629 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=7779, Invalid=19943, Unknown=0, NotChecked=0, Total=27722 [2019-11-07 01:20:26,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2019-11-07 01:20:26,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2019-11-07 01:20:26,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-11-07 01:20:26,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2019-11-07 01:20:26,457 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 58 [2019-11-07 01:20:26,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:20:26,458 INFO L462 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2019-11-07 01:20:26,458 INFO L463 AbstractCegarLoop]: Interpolant automaton has 62 states. [2019-11-07 01:20:26,458 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2019-11-07 01:20:26,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2019-11-07 01:20:26,462 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:20:26,462 INFO L410 BasicCegarLoop]: trace histogram [50, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:20:26,666 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:26,667 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:20:26,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:20:26,667 INFO L82 PathProgramCache]: Analyzing trace with hash 214185690, now seen corresponding path program 5 times [2019-11-07 01:20:26,667 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:20:26,668 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329087558] [2019-11-07 01:20:26,668 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:20:26,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:20:27,998 INFO L134 CoverageAnalysis]: Checked inductivity of 2451 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-11-07 01:20:27,998 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329087558] [2019-11-07 01:20:27,999 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86443191] [2019-11-07 01:20:27,999 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:20:54,615 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2019-11-07 01:20:54,615 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:20:54,629 INFO L256 TraceCheckSpWp]: Trace formula consists of 535 conjuncts, 50 conjunts are in the unsatisfiable core [2019-11-07 01:20:54,636 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:20:54,663 INFO L134 CoverageAnalysis]: Checked inductivity of 2451 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-11-07 01:20:54,663 INFO L321 TraceCheckSpWp]: Computing backward predicates...