/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/standard_copy3_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-07 01:21:47,392 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2019-11-07 01:21:47,416 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-07 01:21:47,417 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-07 01:21:47,418 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-07 01:21:47,419 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-07 01:21:47,420 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-07 01:21:47,421 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-07 01:21:47,422 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-07 01:21:47,424 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-07 01:21:47,426 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-07 01:21:47,429 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-07 01:21:47,430 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-07 01:21:47,431 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-07 01:21:47,436 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-07 01:21:47,453 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-07 01:21:47,454 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-07 01:21:47,455 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-07 01:21:47,455 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 01:21:47,479 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-07 01:21:47,479 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-07 01:21:47,480 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-07 01:21:47,481 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-07 01:21:47,481 INFO L138 SettingsManager]: * Use SBE=true [2019-11-07 01:21:47,481 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-07 01:21:47,481 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-07 01:21:47,482 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-07 01:21:47,482 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-07 01:21:47,482 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-07 01:21:47,483 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-07 01:21:47,483 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-07 01:21:47,483 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-07 01:21:47,484 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-07 01:21:47,484 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-07 01:21:47,484 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-07 01:21:47,484 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-07 01:21:47,485 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-07 01:21:47,485 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-07 01:21:47,485 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-07 01:21:47,485 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-07 01:21:47,486 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-07 01:21:47,486 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-07 01:21:47,486 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-07 01:21:47,486 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-07 01:21:47,486 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-07 01:21:47,487 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-07 01:21:47,487 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-07 01:21:47,487 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 01:21:47,759 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-07 01:21:47,772 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-07 01:21:47,775 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-07 01:21:47,777 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-07 01:21:47,777 INFO L275 PluginConnector]: CDTParser initialized [2019-11-07 01:21:47,778 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy3_ground-2.i [2019-11-07 01:21:47,855 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a0dbecf7/220db88d76584ee6a30a2a75ae0bf8d6/FLAG23cc9ee89 [2019-11-07 01:21:48,344 INFO L306 CDTParser]: Found 1 translation units. [2019-11-07 01:21:48,347 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy3_ground-2.i [2019-11-07 01:21:48,354 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a0dbecf7/220db88d76584ee6a30a2a75ae0bf8d6/FLAG23cc9ee89 [2019-11-07 01:21:48,783 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0a0dbecf7/220db88d76584ee6a30a2a75ae0bf8d6 [2019-11-07 01:21:48,810 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-07 01:21:48,814 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-07 01:21:48,819 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-07 01:21:48,820 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-07 01:21:48,826 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-07 01:21:48,827 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:21:48" (1/1) ... [2019-11-07 01:21:48,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@180c2d46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:48, skipping insertion in model container [2019-11-07 01:21:48,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:21:48" (1/1) ... [2019-11-07 01:21:48,845 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-07 01:21:48,895 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-07 01:21:49,346 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:21:49,355 INFO L188 MainTranslator]: Completed pre-run [2019-11-07 01:21:49,417 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-07 01:21:49,456 INFO L192 MainTranslator]: Completed translation [2019-11-07 01:21:49,457 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49 WrapperNode [2019-11-07 01:21:49,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-07 01:21:49,459 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-07 01:21:49,459 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-07 01:21:49,459 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-07 01:21:49,638 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,638 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,648 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,650 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,664 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,669 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,671 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (1/1) ... [2019-11-07 01:21:49,673 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-07 01:21:49,674 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-07 01:21:49,674 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-07 01:21:49,674 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-07 01:21:49,675 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (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 01:21:49,735 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-07 01:21:49,735 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-07 01:21:49,735 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-07 01:21:49,735 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-07 01:21:49,735 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-07 01:21:49,736 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-07 01:21:49,736 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-07 01:21:49,736 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-07 01:21:49,736 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-07 01:21:49,736 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-07 01:21:49,736 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-07 01:21:49,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-07 01:21:49,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-07 01:21:49,737 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-07 01:21:50,180 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-07 01:21:50,181 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-11-07 01:21:50,182 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:21:50 BoogieIcfgContainer [2019-11-07 01:21:50,182 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-07 01:21:50,183 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-07 01:21:50,183 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-07 01:21:50,185 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-07 01:21:50,186 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:21:48" (1/3) ... [2019-11-07 01:21:50,186 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb2b889 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:21:50, skipping insertion in model container [2019-11-07 01:21:50,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:21:49" (2/3) ... [2019-11-07 01:21:50,187 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7fb2b889 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:21:50, skipping insertion in model container [2019-11-07 01:21:50,187 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:21:50" (3/3) ... [2019-11-07 01:21:50,188 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy3_ground-2.i [2019-11-07 01:21:50,198 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-07 01:21:50,205 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-07 01:21:50,217 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-07 01:21:50,241 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-07 01:21:50,242 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-07 01:21:50,242 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-07 01:21:50,242 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-07 01:21:50,242 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-07 01:21:50,242 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-07 01:21:50,242 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-07 01:21:50,242 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-07 01:21:50,256 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-07 01:21:50,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-11-07 01:21:50,261 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:50,262 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:50,263 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:50,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:50,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1715360832, now seen corresponding path program 1 times [2019-11-07 01:21:50,280 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:50,280 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1411647051] [2019-11-07 01:21:50,281 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:50,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:50,440 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 01:21:50,441 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1411647051] [2019-11-07 01:21:50,442 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:21:50,442 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:21:50,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679508691] [2019-11-07 01:21:50,448 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:21:50,448 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:50,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:21:50,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:21:50,463 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2019-11-07 01:21:50,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:50,501 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2019-11-07 01:21:50,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:21:50,503 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-11-07 01:21:50,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:50,511 INFO L225 Difference]: With dead ends: 37 [2019-11-07 01:21:50,511 INFO L226 Difference]: Without dead ends: 19 [2019-11-07 01:21:50,515 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 01:21:50,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-11-07 01:21:50,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-11-07 01:21:50,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-11-07 01:21:50,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2019-11-07 01:21:50,553 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 14 [2019-11-07 01:21:50,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:50,554 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2019-11-07 01:21:50,554 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:21:50,554 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2019-11-07 01:21:50,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-07 01:21:50,555 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:50,555 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:50,556 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:50,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:50,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1871332789, now seen corresponding path program 1 times [2019-11-07 01:21:50,557 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:50,557 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708413662] [2019-11-07 01:21:50,557 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:50,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:50,625 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 01:21:50,625 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708413662] [2019-11-07 01:21:50,626 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-07 01:21:50,626 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-07 01:21:50,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107606686] [2019-11-07 01:21:50,628 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-07 01:21:50,628 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:50,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-07 01:21:50,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-07 01:21:50,629 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand 3 states. [2019-11-07 01:21:50,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:50,657 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2019-11-07 01:21:50,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-07 01:21:50,657 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-07 01:21:50,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:50,658 INFO L225 Difference]: With dead ends: 33 [2019-11-07 01:21:50,659 INFO L226 Difference]: Without dead ends: 22 [2019-11-07 01:21:50,660 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 01:21:50,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-07 01:21:50,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-07 01:21:50,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-07 01:21:50,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-11-07 01:21:50,666 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 15 [2019-11-07 01:21:50,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:50,667 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-11-07 01:21:50,667 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-07 01:21:50,667 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-11-07 01:21:50,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-07 01:21:50,668 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:50,668 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:50,669 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:50,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:50,669 INFO L82 PathProgramCache]: Analyzing trace with hash -313466217, now seen corresponding path program 1 times [2019-11-07 01:21:50,670 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:50,670 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1079269524] [2019-11-07 01:21:50,670 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:50,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:50,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:21:50,774 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1079269524] [2019-11-07 01:21:50,775 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504520287] [2019-11-07 01:21:50,775 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 01:21:50,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:50,858 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-07 01:21:50,866 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:50,911 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:21:50,914 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:50,953 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-07 01:21:50,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1592932933] [2019-11-07 01:21:51,012 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:21:51,012 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:51,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:51,029 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:51,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:51,161 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:51,569 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:21:52,163 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:52,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:52,172 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:21:52,502 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:21:52,502 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-11-07 01:21:52,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325803660] [2019-11-07 01:21:52,504 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-07 01:21:52,504 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:52,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-07 01:21:52,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2019-11-07 01:21:52,506 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 18 states. [2019-11-07 01:21:53,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:53,189 INFO L93 Difference]: Finished difference Result 52 states and 65 transitions. [2019-11-07 01:21:53,189 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:21:53,189 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 18 [2019-11-07 01:21:53,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:53,191 INFO L225 Difference]: With dead ends: 52 [2019-11-07 01:21:53,191 INFO L226 Difference]: Without dead ends: 37 [2019-11-07 01:21:53,193 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=145, Invalid=785, Unknown=0, NotChecked=0, Total=930 [2019-11-07 01:21:53,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-07 01:21:53,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 28. [2019-11-07 01:21:53,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-07 01:21:53,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-11-07 01:21:53,203 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 18 [2019-11-07 01:21:53,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:53,204 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-11-07 01:21:53,204 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-07 01:21:53,204 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-11-07 01:21:53,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-07 01:21:53,205 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:53,205 INFO L410 BasicCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:53,408 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:21:53,408 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:53,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:53,408 INFO L82 PathProgramCache]: Analyzing trace with hash 1940789760, now seen corresponding path program 2 times [2019-11-07 01:21:53,409 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:53,409 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769512286] [2019-11-07 01:21:53,409 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:53,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:53,552 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-07 01:21:53,553 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769512286] [2019-11-07 01:21:53,553 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572739425] [2019-11-07 01:21:53,553 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 01:21:53,613 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-07 01:21:53,613 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:21:53,614 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-07 01:21:53,616 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:53,624 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-07 01:21:53,624 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:53,650 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-07 01:21:53,651 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [28507919] [2019-11-07 01:21:53,652 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:21:53,653 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:53,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:53,653 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:53,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:53,685 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:54,328 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:21:54,404 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:54,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:54,414 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:21:54,711 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:21:54,712 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-11-07 01:21:54,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958392137] [2019-11-07 01:21:54,713 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-07 01:21:54,713 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:54,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-07 01:21:54,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2019-11-07 01:21:54,714 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 19 states. [2019-11-07 01:21:55,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:55,356 INFO L93 Difference]: Finished difference Result 64 states and 82 transitions. [2019-11-07 01:21:55,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-07 01:21:55,357 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 24 [2019-11-07 01:21:55,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:55,358 INFO L225 Difference]: With dead ends: 64 [2019-11-07 01:21:55,358 INFO L226 Difference]: Without dead ends: 49 [2019-11-07 01:21:55,360 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=186, Invalid=806, Unknown=0, NotChecked=0, Total=992 [2019-11-07 01:21:55,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-07 01:21:55,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 40. [2019-11-07 01:21:55,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-07 01:21:55,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 44 transitions. [2019-11-07 01:21:55,369 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 44 transitions. Word has length 24 [2019-11-07 01:21:55,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:55,370 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 44 transitions. [2019-11-07 01:21:55,370 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-07 01:21:55,370 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 44 transitions. [2019-11-07 01:21:55,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-07 01:21:55,371 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:55,371 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:55,576 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:21:55,577 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:55,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:55,577 INFO L82 PathProgramCache]: Analyzing trace with hash 2133601280, now seen corresponding path program 3 times [2019-11-07 01:21:55,578 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:55,578 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093341765] [2019-11-07 01:21:55,579 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:55,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:55,775 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-11-07 01:21:55,776 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093341765] [2019-11-07 01:21:55,776 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591612259] [2019-11-07 01:21:55,776 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 01:21:55,847 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:21:55,847 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:21:55,849 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-07 01:21:55,855 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:55,921 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-11-07 01:21:55,921 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:56,025 INFO L134 CoverageAnalysis]: Checked inductivity of 73 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2019-11-07 01:21:56,029 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [650809406] [2019-11-07 01:21:56,031 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:21:56,031 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:56,031 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:56,032 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:56,035 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:56,064 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:56,544 WARN L191 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:21:56,791 WARN L191 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 41 [2019-11-07 01:21:56,882 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:56,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:56,895 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:21:57,306 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:21:57,306 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7, 11] total 29 [2019-11-07 01:21:57,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109140417] [2019-11-07 01:21:57,308 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-07 01:21:57,308 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:21:57,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-07 01:21:57,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2019-11-07 01:21:57,309 INFO L87 Difference]: Start difference. First operand 40 states and 44 transitions. Second operand 29 states. [2019-11-07 01:21:58,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:21:58,463 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2019-11-07 01:21:58,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-07 01:21:58,468 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2019-11-07 01:21:58,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:21:58,470 INFO L225 Difference]: With dead ends: 88 [2019-11-07 01:21:58,470 INFO L226 Difference]: Without dead ends: 58 [2019-11-07 01:21:58,472 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 672 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=398, Invalid=2358, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 01:21:58,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-07 01:21:58,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 49. [2019-11-07 01:21:58,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-07 01:21:58,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2019-11-07 01:21:58,483 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 36 [2019-11-07 01:21:58,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:21:58,484 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2019-11-07 01:21:58,484 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-07 01:21:58,484 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2019-11-07 01:21:58,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-07 01:21:58,486 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:21:58,486 INFO L410 BasicCegarLoop]: trace histogram [10, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:21:58,690 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:21:58,690 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:21:58,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:21:58,691 INFO L82 PathProgramCache]: Analyzing trace with hash 1182805644, now seen corresponding path program 4 times [2019-11-07 01:21:58,692 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:21:58,692 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254793825] [2019-11-07 01:21:58,693 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:21:58,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:58,940 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-07 01:21:58,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254793825] [2019-11-07 01:21:58,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941834540] [2019-11-07 01:21:58,941 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 01:21:59,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:21:59,026 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-07 01:21:59,039 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:21:59,057 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-07 01:21:59,057 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:21:59,260 INFO L134 CoverageAnalysis]: Checked inductivity of 139 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2019-11-07 01:21:59,261 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890457749] [2019-11-07 01:21:59,263 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:21:59,264 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:21:59,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:21:59,264 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:21:59,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:21:59,283 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:21:59,907 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:21:59,913 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:21:59,915 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:00,186 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:00,186 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 11] total 35 [2019-11-07 01:22:00,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579060885] [2019-11-07 01:22:00,188 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-11-07 01:22:00,189 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:00,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-11-07 01:22:00,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=861, Unknown=0, NotChecked=0, Total=1190 [2019-11-07 01:22:00,190 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 35 states. [2019-11-07 01:22:01,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:01,396 INFO L93 Difference]: Finished difference Result 103 states and 122 transitions. [2019-11-07 01:22:01,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-11-07 01:22:01,399 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 45 [2019-11-07 01:22:01,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:01,400 INFO L225 Difference]: With dead ends: 103 [2019-11-07 01:22:01,400 INFO L226 Difference]: Without dead ends: 70 [2019-11-07 01:22:01,402 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1029 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=934, Invalid=3098, Unknown=0, NotChecked=0, Total=4032 [2019-11-07 01:22:01,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-07 01:22:01,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 61. [2019-11-07 01:22:01,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-07 01:22:01,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2019-11-07 01:22:01,412 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 45 [2019-11-07 01:22:01,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:01,413 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2019-11-07 01:22:01,413 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-11-07 01:22:01,413 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2019-11-07 01:22:01,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-07 01:22:01,414 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:01,414 INFO L410 BasicCegarLoop]: trace histogram [22, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:01,617 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:01,618 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:01,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:01,618 INFO L82 PathProgramCache]: Analyzing trace with hash 837686988, now seen corresponding path program 5 times [2019-11-07 01:22:01,618 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:01,619 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105377357] [2019-11-07 01:22:01,619 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:01,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:01,836 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 309 trivial. 0 not checked. [2019-11-07 01:22:01,836 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105377357] [2019-11-07 01:22:01,836 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255132075] [2019-11-07 01:22:01,837 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 01:22:03,512 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2019-11-07 01:22:03,512 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:03,515 INFO L256 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-07 01:22:03,518 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:03,533 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 7 proven. 28 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2019-11-07 01:22:03,534 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:03,644 INFO L134 CoverageAnalysis]: Checked inductivity of 337 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 309 trivial. 0 not checked. [2019-11-07 01:22:03,645 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1710824580] [2019-11-07 01:22:03,646 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:22:03,646 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:03,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:03,646 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:03,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:03,661 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:04,109 WARN L191 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:22:04,338 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:04,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:04,344 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:04,580 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:04,581 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 10, 11] total 30 [2019-11-07 01:22:04,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908935646] [2019-11-07 01:22:04,583 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-07 01:22:04,583 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:04,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-07 01:22:04,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=651, Unknown=0, NotChecked=0, Total=870 [2019-11-07 01:22:04,584 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand 30 states. [2019-11-07 01:22:05,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:05,821 INFO L93 Difference]: Finished difference Result 122 states and 155 transitions. [2019-11-07 01:22:05,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-07 01:22:05,822 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 57 [2019-11-07 01:22:05,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:05,823 INFO L225 Difference]: With dead ends: 122 [2019-11-07 01:22:05,825 INFO L226 Difference]: Without dead ends: 97 [2019-11-07 01:22:05,826 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 170 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 709 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=629, Invalid=2127, Unknown=0, NotChecked=0, Total=2756 [2019-11-07 01:22:05,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2019-11-07 01:22:05,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 88. [2019-11-07 01:22:05,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-11-07 01:22:05,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2019-11-07 01:22:05,853 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 57 [2019-11-07 01:22:05,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:05,853 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2019-11-07 01:22:05,854 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-07 01:22:05,855 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2019-11-07 01:22:05,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-11-07 01:22:05,857 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:05,859 INFO L410 BasicCegarLoop]: trace histogram [22, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:06,065 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:06,066 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:06,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:06,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1909214368, now seen corresponding path program 6 times [2019-11-07 01:22:06,067 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:06,067 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1534632405] [2019-11-07 01:22:06,067 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:06,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:06,486 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 525 trivial. 0 not checked. [2019-11-07 01:22:06,487 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1534632405] [2019-11-07 01:22:06,487 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108120006] [2019-11-07 01:22:06,487 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:06,623 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-07 01:22:06,624 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-07 01:22:06,626 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-07 01:22:06,642 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:07,102 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-11-07 01:22:07,103 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:08,158 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 408 trivial. 0 not checked. [2019-11-07 01:22:08,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [357440716] [2019-11-07 01:22:08,160 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:22:08,160 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:08,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:08,161 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:08,161 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:08,180 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:08,829 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:08,843 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:08,847 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:09,241 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:09,241 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 25, 25, 11] total 75 [2019-11-07 01:22:09,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [301129038] [2019-11-07 01:22:09,243 INFO L442 AbstractCegarLoop]: Interpolant automaton has 75 states [2019-11-07 01:22:09,243 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:09,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2019-11-07 01:22:09,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=4223, Unknown=0, NotChecked=0, Total=5550 [2019-11-07 01:22:09,246 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand 75 states. [2019-11-07 01:22:13,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:13,354 INFO L93 Difference]: Finished difference Result 184 states and 218 transitions. [2019-11-07 01:22:13,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2019-11-07 01:22:13,354 INFO L78 Accepts]: Start accepts. Automaton has 75 states. Word has length 84 [2019-11-07 01:22:13,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:13,356 INFO L225 Difference]: With dead ends: 184 [2019-11-07 01:22:13,356 INFO L226 Difference]: Without dead ends: 124 [2019-11-07 01:22:13,361 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 341 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4998 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=4009, Invalid=16871, Unknown=0, NotChecked=0, Total=20880 [2019-11-07 01:22:13,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-11-07 01:22:13,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 115. [2019-11-07 01:22:13,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-11-07 01:22:13,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 119 transitions. [2019-11-07 01:22:13,377 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 119 transitions. Word has length 84 [2019-11-07 01:22:13,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:13,377 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 119 transitions. [2019-11-07 01:22:13,377 INFO L463 AbstractCegarLoop]: Interpolant automaton has 75 states. [2019-11-07 01:22:13,377 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 119 transitions. [2019-11-07 01:22:13,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-11-07 01:22:13,379 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:13,379 INFO L410 BasicCegarLoop]: trace histogram [46, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-07 01:22:13,583 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:13,584 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-07 01:22:13,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-07 01:22:13,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1814523980, now seen corresponding path program 7 times [2019-11-07 01:22:13,584 INFO L161 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-11-07 01:22:13,585 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219317557] [2019-11-07 01:22:13,585 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-07 01:22:13,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:14,284 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 1387 trivial. 0 not checked. [2019-11-07 01:22:14,284 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219317557] [2019-11-07 01:22:14,284 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1630431768] [2019-11-07 01:22:14,285 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 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-07 01:22:14,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-07 01:22:14,500 INFO L256 TraceCheckSpWp]: Trace formula consists of 652 conjuncts, 48 conjunts are in the unsatisfiable core [2019-11-07 01:22:14,507 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-07 01:22:15,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-11-07 01:22:15,690 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-11-07 01:22:18,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1540 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2019-11-07 01:22:18,940 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114439686] [2019-11-07 01:22:18,947 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2019-11-07 01:22:18,947 INFO L166 IcfgInterpreter]: Building call graph [2019-11-07 01:22:18,952 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-11-07 01:22:18,952 INFO L176 IcfgInterpreter]: Starting interpretation [2019-11-07 01:22:18,952 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-11-07 01:22:18,964 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-11-07 01:22:19,252 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 38 [2019-11-07 01:22:19,671 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2019-11-07 01:22:19,675 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-11-07 01:22:19,677 INFO L180 IcfgInterpreter]: Interpretation finished [2019-11-07 01:22:20,282 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-11-07 01:22:20,283 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 49, 49, 11] total 124 [2019-11-07 01:22:20,283 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215024033] [2019-11-07 01:22:20,285 INFO L442 AbstractCegarLoop]: Interpolant automaton has 124 states [2019-11-07 01:22:20,285 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-11-07 01:22:20,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2019-11-07 01:22:20,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4778, Invalid=10474, Unknown=0, NotChecked=0, Total=15252 [2019-11-07 01:22:20,291 INFO L87 Difference]: Start difference. First operand 115 states and 119 transitions. Second operand 124 states. [2019-11-07 01:22:30,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-07 01:22:30,508 INFO L93 Difference]: Finished difference Result 238 states and 296 transitions. [2019-11-07 01:22:30,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2019-11-07 01:22:30,509 INFO L78 Accepts]: Start accepts. Automaton has 124 states. Word has length 111 [2019-11-07 01:22:30,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-07 01:22:30,511 INFO L225 Difference]: With dead ends: 238 [2019-11-07 01:22:30,511 INFO L226 Difference]: Without dead ends: 175 [2019-11-07 01:22:30,516 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 250 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12817 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=14364, Invalid=44442, Unknown=0, NotChecked=0, Total=58806 [2019-11-07 01:22:30,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2019-11-07 01:22:30,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 166. [2019-11-07 01:22:30,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-11-07 01:22:30,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 170 transitions. [2019-11-07 01:22:30,536 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 170 transitions. Word has length 111 [2019-11-07 01:22:30,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-07 01:22:30,536 INFO L462 AbstractCegarLoop]: Abstraction has 166 states and 170 transitions. [2019-11-07 01:22:30,536 INFO L463 AbstractCegarLoop]: Interpolant automaton has 124 states. [2019-11-07 01:22:30,536 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 170 transitions. [2019-11-07 01:22:30,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2019-11-07 01:22:30,539 INFO L402 BasicCegarLoop]: Found error trace [2019-11-07 01:22:30,539 INFO L410 BasicCegarLoop]: trace histogram [94, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]