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-tiling/rewnifrev.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:38:50,456 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:38:50,459 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:38:50,477 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:38:50,477 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:38:50,479 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:38:50,481 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:38:50,491 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:38:50,496 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:38:50,500 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:38:50,501 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:38:50,503 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:38:50,504 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:38:50,506 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:38:50,508 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:38:50,509 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:38:50,511 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:38:50,513 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:38:50,514 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:38:50,519 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:38:50,523 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:38:50,525 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:38:50,528 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:38:50,529 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:38:50,531 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:38:50,542 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:38:50,543 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:38:50,544 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:38:50,545 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 [2019-10-15 01:38:50,579 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:38:50,582 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:38:50,584 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:38:50,584 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:38:50,584 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:38:50,584 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:38:50,584 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:38:50,585 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:38:50,585 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:38:50,585 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:38:50,586 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:38:50,586 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:38:50,586 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:38:50,587 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:38:50,587 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:38:50,587 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:38:50,587 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:38:50,587 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:38:50,588 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:38:50,588 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:38:50,588 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:38:50,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:38:50,588 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:38:50,589 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:38:50,589 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:38:50,589 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:38:50,589 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:38:50,589 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:38:50,590 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 [2019-10-15 01:38:50,872 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:38:50,885 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:38:50,889 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:38:50,890 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:38:50,891 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:38:50,892 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/rewnifrev.c [2019-10-15 01:38:50,954 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/642f6c97c/f8f8b1cc1afe4e22aae355863ceb7ed6/FLAG17daa9afd [2019-10-15 01:38:51,408 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:38:51,408 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnifrev.c [2019-10-15 01:38:51,415 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/642f6c97c/f8f8b1cc1afe4e22aae355863ceb7ed6/FLAG17daa9afd [2019-10-15 01:38:51,800 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/642f6c97c/f8f8b1cc1afe4e22aae355863ceb7ed6 [2019-10-15 01:38:51,811 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:38:51,813 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:38:51,814 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:51,814 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:38:51,818 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:38:51,819 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:51" (1/1) ... [2019-10-15 01:38:51,822 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4563917c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:51, skipping insertion in model container [2019-10-15 01:38:51,822 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:51" (1/1) ... [2019-10-15 01:38:51,830 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:38:51,855 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:38:52,075 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:52,088 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:38:52,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:52,125 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:38:52,125 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52 WrapperNode [2019-10-15 01:38:52,126 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:52,126 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:38:52,126 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:38:52,126 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:38:52,220 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,226 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,236 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,238 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,252 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,258 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,259 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (1/1) ... [2019-10-15 01:38:52,261 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:38:52,262 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:38:52,262 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:38:52,262 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:38:52,263 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (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 [2019-10-15 01:38:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:38:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:38:52,321 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:38:52,322 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:38:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:38:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:38:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:38:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:38:52,322 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 01:38:52,323 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:38:52,323 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 01:38:52,323 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:38:52,323 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:38:52,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:38:52,323 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:38:52,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:38:52,707 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:38:52,707 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:38:52,709 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:52 BoogieIcfgContainer [2019-10-15 01:38:52,709 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:38:52,710 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:38:52,710 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:38:52,714 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:38:52,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:38:51" (1/3) ... [2019-10-15 01:38:52,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@765104fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:52, skipping insertion in model container [2019-10-15 01:38:52,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52" (2/3) ... [2019-10-15 01:38:52,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@765104fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:38:52, skipping insertion in model container [2019-10-15 01:38:52,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:52" (3/3) ... [2019-10-15 01:38:52,717 INFO L109 eAbstractionObserver]: Analyzing ICFG rewnifrev.c [2019-10-15 01:38:52,729 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:38:52,736 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:38:52,748 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:38:52,774 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:38:52,774 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:38:52,774 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:38:52,774 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:38:52,775 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:38:52,775 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:38:52,775 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:38:52,775 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:38:52,789 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-10-15 01:38:52,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:38:52,795 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:52,795 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:52,797 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:52,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:52,802 INFO L82 PathProgramCache]: Analyzing trace with hash 698834392, now seen corresponding path program 1 times [2019-10-15 01:38:52,809 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:52,809 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [993039590] [2019-10-15 01:38:52,809 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:52,810 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:52,810 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:52,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:52,996 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:52,997 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [993039590] [2019-10-15 01:38:52,998 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:52,998 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:38:52,999 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214150359] [2019-10-15 01:38:53,003 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:38:53,004 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:53,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:38:53,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:38:53,021 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2019-10-15 01:38:53,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:53,072 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2019-10-15 01:38:53,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:38:53,074 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:38:53,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:53,082 INFO L225 Difference]: With dead ends: 34 [2019-10-15 01:38:53,083 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 01:38:53,086 INFO L600 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 [2019-10-15 01:38:53,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 01:38:53,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-15 01:38:53,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 01:38:53,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-15 01:38:53,131 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-10-15 01:38:53,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:53,131 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-15 01:38:53,131 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:38:53,132 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-15 01:38:53,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:38:53,132 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:53,133 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:53,133 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:53,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:53,134 INFO L82 PathProgramCache]: Analyzing trace with hash -494855414, now seen corresponding path program 1 times [2019-10-15 01:38:53,134 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:53,134 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976944654] [2019-10-15 01:38:53,134 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,135 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,135 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:53,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:53,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:53,238 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976944654] [2019-10-15 01:38:53,239 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [563448048] [2019-10-15 01:38:53,239 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 [2019-10-15 01:38:53,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:53,313 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:38:53,319 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:53,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:53,336 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:53,359 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:53,360 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575911764] [2019-10-15 01:38:53,390 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:38:53,390 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:53,403 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:53,417 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:53,417 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:53,662 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:38:54,151 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 35 for LOIs [2019-10-15 01:38:54,166 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:38:54,175 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:54,915 WARN L191 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 32 [2019-10-15 01:38:55,002 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:55,002 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 15 [2019-10-15 01:38:55,003 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549728576] [2019-10-15 01:38:55,005 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-15 01:38:55,005 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:55,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-15 01:38:55,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2019-10-15 01:38:55,007 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 15 states. [2019-10-15 01:38:55,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:55,580 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2019-10-15 01:38:55,581 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-15 01:38:55,581 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 13 [2019-10-15 01:38:55,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:55,587 INFO L225 Difference]: With dead ends: 39 [2019-10-15 01:38:55,587 INFO L226 Difference]: Without dead ends: 30 [2019-10-15 01:38:55,591 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2019-10-15 01:38:55,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-15 01:38:55,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 18. [2019-10-15 01:38:55,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-15 01:38:55,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2019-10-15 01:38:55,609 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2019-10-15 01:38:55,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:55,610 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2019-10-15 01:38:55,610 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-15 01:38:55,610 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2019-10-15 01:38:55,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 01:38:55,612 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:55,612 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:55,815 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:55,816 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:55,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:55,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1155466264, now seen corresponding path program 2 times [2019-10-15 01:38:55,817 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:55,818 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114506687] [2019-10-15 01:38:55,818 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:55,819 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:55,819 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:55,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:55,998 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:38:55,999 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114506687] [2019-10-15 01:38:55,999 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020013038] [2019-10-15 01:38:55,999 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 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 [2019-10-15 01:38:56,066 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:38:56,067 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:38:56,068 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 01:38:56,071 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:56,259 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:38:56,259 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:56,319 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:38:56,319 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2019-10-15 01:38:56,319 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [8] total 16 [2019-10-15 01:38:56,320 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989817721] [2019-10-15 01:38:56,320 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-15 01:38:56,320 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:56,320 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-15 01:38:56,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2019-10-15 01:38:56,321 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2019-10-15 01:38:56,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:56,458 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2019-10-15 01:38:56,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-15 01:38:56,459 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2019-10-15 01:38:56,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:56,460 INFO L225 Difference]: With dead ends: 27 [2019-10-15 01:38:56,460 INFO L226 Difference]: Without dead ends: 25 [2019-10-15 01:38:56,461 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:38:56,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-15 01:38:56,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-10-15 01:38:56,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:38:56,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-10-15 01:38:56,477 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 14 [2019-10-15 01:38:56,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:56,478 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-10-15 01:38:56,478 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-15 01:38:56,478 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-10-15 01:38:56,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:38:56,481 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:56,481 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:56,686 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:38:56,686 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:56,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:56,687 INFO L82 PathProgramCache]: Analyzing trace with hash -1648168292, now seen corresponding path program 1 times [2019-10-15 01:38:56,687 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:56,688 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857618798] [2019-10-15 01:38:56,688 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:56,688 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:56,689 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:56,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:56,883 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:56,883 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857618798] [2019-10-15 01:38:56,884 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817010743] [2019-10-15 01:38:56,884 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-10-15 01:38:56,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:56,970 INFO L256 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-15 01:38:56,977 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:57,727 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:57,728 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:57,993 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:57,994 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247181403] [2019-10-15 01:38:57,995 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:38:57,995 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:57,996 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:57,996 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:57,996 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:58,047 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:38:58,617 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:38:58,636 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:38:58,642 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:59,926 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:59,926 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 13] total 38 [2019-10-15 01:38:59,927 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765279453] [2019-10-15 01:38:59,928 INFO L442 AbstractCegarLoop]: Interpolant automaton has 38 states [2019-10-15 01:38:59,928 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:59,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2019-10-15 01:38:59,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1252, Unknown=0, NotChecked=0, Total=1406 [2019-10-15 01:38:59,929 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 38 states. [2019-10-15 01:39:00,424 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 83 [2019-10-15 01:39:01,922 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 89 [2019-10-15 01:39:02,123 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 92 [2019-10-15 01:39:02,660 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 92 [2019-10-15 01:39:02,878 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 87 [2019-10-15 01:39:02,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:02,882 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2019-10-15 01:39:02,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-15 01:39:02,883 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 21 [2019-10-15 01:39:02,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:02,883 INFO L225 Difference]: With dead ends: 33 [2019-10-15 01:39:02,884 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:39:02,885 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 792 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=381, Invalid=2589, Unknown=0, NotChecked=0, Total=2970 [2019-10-15 01:39:02,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:39:02,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2019-10-15 01:39:02,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:39:02,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-15 01:39:02,896 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2019-10-15 01:39:02,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:02,896 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-15 01:39:02,896 INFO L463 AbstractCegarLoop]: Interpolant automaton has 38 states. [2019-10-15 01:39:02,896 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-15 01:39:02,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:39:02,898 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:02,899 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:03,110 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:03,111 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:03,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:03,111 INFO L82 PathProgramCache]: Analyzing trace with hash -145594472, now seen corresponding path program 2 times [2019-10-15 01:39:03,112 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:03,112 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882399174] [2019-10-15 01:39:03,112 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:03,112 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:03,112 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:03,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:03,194 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:03,194 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882399174] [2019-10-15 01:39:03,195 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142939027] [2019-10-15 01:39:03,195 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 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 [2019-10-15 01:39:03,262 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:39:03,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:03,263 INFO L256 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:39:03,265 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:03,321 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:03,322 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:03,372 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [521659334] [2019-10-15 01:39:03,374 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:03,374 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:03,375 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:03,375 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:03,375 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:03,404 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:39:03,749 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:03,761 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:03,765 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:04,665 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:04,666 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 8, 13] total 27 [2019-10-15 01:39:04,666 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145860695] [2019-10-15 01:39:04,667 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-15 01:39:04,668 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:04,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-15 01:39:04,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=570, Unknown=0, NotChecked=0, Total=702 [2019-10-15 01:39:04,669 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 27 states. [2019-10-15 01:39:06,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:06,632 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2019-10-15 01:39:06,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-15 01:39:06,633 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 28 [2019-10-15 01:39:06,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:06,634 INFO L225 Difference]: With dead ends: 55 [2019-10-15 01:39:06,634 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:39:06,636 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 845 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=453, Invalid=2199, Unknown=0, NotChecked=0, Total=2652 [2019-10-15 01:39:06,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:39:06,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-10-15 01:39:06,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-15 01:39:06,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-10-15 01:39:06,648 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2019-10-15 01:39:06,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:06,649 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-10-15 01:39:06,649 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-15 01:39:06,649 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-10-15 01:39:06,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-15 01:39:06,650 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:06,650 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:06,853 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:06,854 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:06,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:06,855 INFO L82 PathProgramCache]: Analyzing trace with hash 138379466, now seen corresponding path program 3 times [2019-10-15 01:39:06,855 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:06,856 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475131062] [2019-10-15 01:39:06,856 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:06,856 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:06,857 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:06,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:07,060 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:07,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475131062] [2019-10-15 01:39:07,061 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332560893] [2019-10-15 01:39:07,061 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 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 [2019-10-15 01:39:07,132 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:39:07,132 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:07,133 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-15 01:39:07,139 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:07,344 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:39:07,457 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 48 [2019-10-15 01:39:10,120 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 5 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:39:10,120 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:10,353 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:10,354 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [342896230] [2019-10-15 01:39:10,357 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:10,357 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:10,358 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:10,358 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:10,358 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:10,387 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:39:10,715 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:10,746 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:10,749 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:11,417 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 24 [2019-10-15 01:39:12,069 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:12,070 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 11, 13] total 40 [2019-10-15 01:39:12,070 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1236924356] [2019-10-15 01:39:12,071 INFO L442 AbstractCegarLoop]: Interpolant automaton has 40 states [2019-10-15 01:39:12,072 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:12,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2019-10-15 01:39:12,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1389, Unknown=1, NotChecked=0, Total=1560 [2019-10-15 01:39:12,073 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 40 states. [2019-10-15 01:39:18,843 WARN L191 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 87 [2019-10-15 01:39:22,357 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 89 [2019-10-15 01:39:23,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:23,016 INFO L93 Difference]: Finished difference Result 39 states and 42 transitions. [2019-10-15 01:39:23,016 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 01:39:23,016 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 29 [2019-10-15 01:39:23,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:23,017 INFO L225 Difference]: With dead ends: 39 [2019-10-15 01:39:23,017 INFO L226 Difference]: Without dead ends: 37 [2019-10-15 01:39:23,019 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 940 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=460, Invalid=3079, Unknown=1, NotChecked=0, Total=3540 [2019-10-15 01:39:23,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-15 01:39:23,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 33. [2019-10-15 01:39:23,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:39:23,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-10-15 01:39:23,030 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 29 [2019-10-15 01:39:23,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:23,030 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-10-15 01:39:23,030 INFO L463 AbstractCegarLoop]: Interpolant automaton has 40 states. [2019-10-15 01:39:23,030 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-10-15 01:39:23,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 01:39:23,031 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:23,032 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:23,237 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:23,238 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:23,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:23,239 INFO L82 PathProgramCache]: Analyzing trace with hash -1699731030, now seen corresponding path program 4 times [2019-10-15 01:39:23,239 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:23,239 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882487703] [2019-10-15 01:39:23,240 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:23,240 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:23,240 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:23,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:23,328 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 14 proven. 13 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:23,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882487703] [2019-10-15 01:39:23,329 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246999953] [2019-10-15 01:39:23,329 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 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 [2019-10-15 01:39:23,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:23,419 INFO L256 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:39:23,421 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:23,475 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:23,476 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:23,540 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:23,540 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1911071478] [2019-10-15 01:39:23,541 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:23,542 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:23,542 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:23,542 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:23,542 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:23,569 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:39:23,862 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2019-10-15 01:39:23,879 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:23,887 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:24,788 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:24,789 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 10, 13] total 30 [2019-10-15 01:39:24,789 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713123857] [2019-10-15 01:39:24,790 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-15 01:39:24,791 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:24,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-15 01:39:24,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=699, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:39:24,791 INFO L87 Difference]: Start difference. First operand 33 states and 36 transitions. Second operand 30 states. [2019-10-15 01:39:27,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:27,209 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2019-10-15 01:39:27,209 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2019-10-15 01:39:27,209 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 36 [2019-10-15 01:39:27,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:27,211 INFO L225 Difference]: With dead ends: 62 [2019-10-15 01:39:27,211 INFO L226 Difference]: Without dead ends: 35 [2019-10-15 01:39:27,213 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1187 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=671, Invalid=3111, Unknown=0, NotChecked=0, Total=3782 [2019-10-15 01:39:27,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-15 01:39:27,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-10-15 01:39:27,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-15 01:39:27,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-15 01:39:27,225 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 36 [2019-10-15 01:39:27,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:27,225 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-15 01:39:27,225 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-15 01:39:27,225 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-15 01:39:27,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-15 01:39:27,226 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:27,227 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:27,430 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:27,430 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:27,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:27,431 INFO L82 PathProgramCache]: Analyzing trace with hash 315748572, now seen corresponding path program 5 times [2019-10-15 01:39:27,431 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:27,432 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207621374] [2019-10-15 01:39:27,432 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:27,432 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:27,433 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:27,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:27,635 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 10 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:27,635 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207621374] [2019-10-15 01:39:27,635 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653320341] [2019-10-15 01:39:27,635 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 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 [2019-10-15 01:39:27,746 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-15 01:39:27,746 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:27,747 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 41 conjunts are in the unsatisfiable core [2019-10-15 01:39:27,753 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:28,156 WARN L191 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2019-10-15 01:39:28,323 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-10-15 01:39:28,474 WARN L191 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 57 [2019-10-15 01:39:29,622 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 7 proven. 30 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:39:29,622 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:32,551 WARN L191 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 19 [2019-10-15 01:39:33,942 WARN L191 SmtUtils]: Spent 1.33 s on a formula simplification that was a NOOP. DAG size: 21