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/rewnifrev2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:38:50,632 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:38:50,634 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:38:50,654 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:38:50,654 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:38:50,656 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:38:50,658 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:38:50,668 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:38:50,673 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:38:50,676 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:38:50,678 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:38:50,679 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:38:50,679 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:38:50,681 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:38:50,683 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:38:50,685 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:38:50,686 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:38:50,687 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:38:50,689 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:38:50,693 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:38:50,697 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:38:50,700 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:38:50,702 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:38:50,703 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:38:50,705 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:38:50,709 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:38:50,711 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:38:50,712 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:38:50,713 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:38:50,714 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:38:50,714 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:38:50,715 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:38:50,715 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:38:50,715 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:38:50,716 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:38:50,718 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:38:50,719 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 01:38:50,750 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:38:50,750 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:38:50,752 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:38:50,752 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:38:50,752 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:38:50,755 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:38:50,756 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:38:50,756 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:38:50,756 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:38:50,756 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:38:50,756 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:38:50,757 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:38:50,757 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:38:50,757 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:38:50,759 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:38:50,759 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:38:50,759 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:38:50,760 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:38:50,760 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:38:50,760 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:38:50,760 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:38:50,760 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:38:50,761 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:38:50,761 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:38:50,761 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:38:50,761 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:38:50,761 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:38:50,761 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:38:50,762 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 01:38:51,057 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:38:51,075 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:38:51,079 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:38:51,080 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:38:51,081 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:38:51,082 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-tiling/rewnifrev2.c [2019-10-15 01:38:51,154 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecb51a8ca/19f197d5727a49969b7a66e9773e6262/FLAGe9cf6fd74 [2019-10-15 01:38:51,599 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:38:51,600 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-tiling/rewnifrev2.c [2019-10-15 01:38:51,606 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecb51a8ca/19f197d5727a49969b7a66e9773e6262/FLAGe9cf6fd74 [2019-10-15 01:38:51,967 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ecb51a8ca/19f197d5727a49969b7a66e9773e6262 [2019-10-15 01:38:51,977 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:38:51,978 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:38:51,980 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:51,980 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:38:51,983 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:38:51,984 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:51" (1/1) ... [2019-10-15 01:38:51,987 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a7a5bea 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 01:38:51,987 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:38:51" (1/1) ... [2019-10-15 01:38:51,994 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:38:52,012 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:38:52,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:52,181 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:38:52,199 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:38:52,215 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:38:52,216 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:38:52 WrapperNode [2019-10-15 01:38:52,216 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:38:52,217 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:38:52,217 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:38:52,217 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:38:52,230 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 01:38:52,231 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 01:38:52,321 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 01:38:52,321 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 01:38:52,327 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 01:38:52,332 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 01:38:52,333 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 01:38:52,335 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:38:52,336 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:38:52,336 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:38:52,336 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:38:52,337 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 01:38:52,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:38:52,387 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:38:52,387 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:38:52,387 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:38:52,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:38:52,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:38:52,387 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:38:52,388 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:38:52,388 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 01:38:52,388 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:38:52,388 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 01:38:52,388 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:38:52,388 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:38:52,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:38:52,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:38:52,389 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:38:52,663 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:38:52,663 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-15 01:38:52,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:38:52 BoogieIcfgContainer [2019-10-15 01:38:52,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:38:52,666 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:38:52,666 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:38:52,669 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:38:52,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:38:51" (1/3) ... [2019-10-15 01:38:52,670 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@172bbabe 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 01:38:52,671 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 01:38:52,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@172bbabe 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 01:38:52,671 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 01:38:52,673 INFO L109 eAbstractionObserver]: Analyzing ICFG rewnifrev2.c [2019-10-15 01:38:52,683 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:38:52,690 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:38:52,701 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:38:52,744 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:38:52,745 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:38:52,745 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:38:52,745 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:38:52,745 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:38:52,745 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:38:52,746 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:38:52,746 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:38:52,764 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2019-10-15 01:38:52,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:38:52,769 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:52,770 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:52,772 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:52,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:52,777 INFO L82 PathProgramCache]: Analyzing trace with hash -1458036132, now seen corresponding path program 1 times [2019-10-15 01:38:52,784 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:52,784 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982535986] [2019-10-15 01:38:52,784 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:52,785 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:52,785 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:52,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:52,957 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 01:38:52,957 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982535986] [2019-10-15 01:38:52,958 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:52,959 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:38:52,959 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140964521] [2019-10-15 01:38:52,967 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:38:52,968 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:52,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:38:52,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:38:52,986 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 3 states. [2019-10-15 01:38:53,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:53,041 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2019-10-15 01:38:53,042 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:38:53,043 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:38:53,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:53,049 INFO L225 Difference]: With dead ends: 36 [2019-10-15 01:38:53,050 INFO L226 Difference]: Without dead ends: 17 [2019-10-15 01:38:53,053 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 01:38:53,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-15 01:38:53,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-15 01:38:53,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-15 01:38:53,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-15 01:38:53,089 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 12 [2019-10-15 01:38:53,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:53,090 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-15 01:38:53,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:38:53,090 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-15 01:38:53,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:38:53,091 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:53,091 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:53,092 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:53,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:53,092 INFO L82 PathProgramCache]: Analyzing trace with hash 2020700190, now seen corresponding path program 1 times [2019-10-15 01:38:53,093 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:53,093 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927357661] [2019-10-15 01:38:53,093 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,093 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,093 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:53,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:53,355 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:53,355 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927357661] [2019-10-15 01:38:53,356 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:38:53,356 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2019-10-15 01:38:53,356 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240652049] [2019-10-15 01:38:53,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-15 01:38:53,358 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:53,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-15 01:38:53,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-15 01:38:53,359 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 8 states. [2019-10-15 01:38:53,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:38:53,486 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2019-10-15 01:38:53,486 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-15 01:38:53,486 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2019-10-15 01:38:53,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:38:53,488 INFO L225 Difference]: With dead ends: 26 [2019-10-15 01:38:53,488 INFO L226 Difference]: Without dead ends: 24 [2019-10-15 01:38:53,489 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-10-15 01:38:53,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-15 01:38:53,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2019-10-15 01:38:53,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-15 01:38:53,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-10-15 01:38:53,497 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 13 [2019-10-15 01:38:53,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:38:53,498 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-10-15 01:38:53,498 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-15 01:38:53,498 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-10-15 01:38:53,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:38:53,499 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:38:53,499 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:38:53,499 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:38:53,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:38:53,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1910970063, now seen corresponding path program 1 times [2019-10-15 01:38:53,500 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:38:53,500 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286748796] [2019-10-15 01:38:53,501 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,501 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:38:53,501 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:38:53,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:53,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:53,671 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286748796] [2019-10-15 01:38:53,671 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090321336] [2019-10-15 01:38:53,671 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 01:38:53,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:38:53,731 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-15 01:38:53,739 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:38:53,789 INFO L189 IndexEqualityManager]: detected not equals via solver [2019-10-15 01:38:53,828 INFO L341 Elim1Store]: treesize reduction 41, result has 21.2 percent of original size [2019-10-15 01:38:53,829 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 26 [2019-10-15 01:38:53,830 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-15 01:38:53,841 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-15 01:38:53,843 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2019-10-15 01:38:53,843 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:34 [2019-10-15 01:38:54,139 INFO L341 Elim1Store]: treesize reduction 17, result has 66.7 percent of original size [2019-10-15 01:38:54,140 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 45 [2019-10-15 01:38:54,141 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:54,142 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:54,146 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 2 xjuncts. [2019-10-15 01:38:54,168 INFO L567 ElimStorePlain]: treesize reduction 50, result has 23.1 percent of original size [2019-10-15 01:38:54,169 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-15 01:38:54,169 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:46, output treesize:7 [2019-10-15 01:38:54,192 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:54,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:54,237 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:38:54,350 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 01:38:54,405 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:38:54,406 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1799309566] [2019-10-15 01:38:54,449 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:38:54,450 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:38:54,457 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:38:54,468 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:38:54,469 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:38:54,638 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:38:56,705 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2019-10-15 01:38:56,719 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:38:56,724 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:38:57,582 WARN L191 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2019-10-15 01:38:58,164 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:38:58,164 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 8, 13] total 34 [2019-10-15 01:38:58,165 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469242171] [2019-10-15 01:38:58,166 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-15 01:38:58,167 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:38:58,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-15 01:38:58,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1007, Unknown=0, NotChecked=0, Total=1122 [2019-10-15 01:38:58,169 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 34 states. [2019-10-15 01:39:00,183 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 58 [2019-10-15 01:39:00,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:00,611 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2019-10-15 01:39:00,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-15 01:39:00,612 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 20 [2019-10-15 01:39:00,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:00,614 INFO L225 Difference]: With dead ends: 35 [2019-10-15 01:39:00,615 INFO L226 Difference]: Without dead ends: 33 [2019-10-15 01:39:00,616 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 36 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 593 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=320, Invalid=2230, Unknown=0, NotChecked=0, Total=2550 [2019-10-15 01:39:00,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-15 01:39:00,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2019-10-15 01:39:00,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-15 01:39:00,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-15 01:39:00,628 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 20 [2019-10-15 01:39:00,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:00,629 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-15 01:39:00,629 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-15 01:39:00,629 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-15 01:39:00,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-15 01:39:00,631 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:00,631 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:00,836 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:00,836 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:00,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:00,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1115530430, now seen corresponding path program 2 times [2019-10-15 01:39:00,838 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:00,838 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281683513] [2019-10-15 01:39:00,838 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:00,839 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:00,839 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:00,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:00,907 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 7 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:00,907 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281683513] [2019-10-15 01:39:00,908 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [865987334] [2019-10-15 01:39:00,908 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 01:39:00,980 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:39:00,980 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:00,981 INFO L256 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:39:00,987 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:01,027 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:01,027 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:01,071 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:01,071 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1874703997] [2019-10-15 01:39:01,073 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:01,073 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:01,074 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:01,074 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:01,074 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:01,132 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:39:02,530 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2019-10-15 01:39:02,540 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:02,544 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:03,259 WARN L191 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2019-10-15 01:39:03,628 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:03,628 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 13] total 26 [2019-10-15 01:39:03,628 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659509125] [2019-10-15 01:39:03,629 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 01:39:03,629 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:03,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 01:39:03,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=535, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:39:03,631 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 26 states. [2019-10-15 01:39:07,450 WARN L191 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 32 [2019-10-15 01:39:07,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:07,819 INFO L93 Difference]: Finished difference Result 53 states and 56 transitions. [2019-10-15 01:39:07,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-15 01:39:07,820 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 27 [2019-10-15 01:39:07,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:07,824 INFO L225 Difference]: With dead ends: 53 [2019-10-15 01:39:07,824 INFO L226 Difference]: Without dead ends: 29 [2019-10-15 01:39:07,826 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 61 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 646 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=331, Invalid=1738, Unknown=1, NotChecked=0, Total=2070 [2019-10-15 01:39:07,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-15 01:39:07,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-15 01:39:07,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-15 01:39:07,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-15 01:39:07,835 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2019-10-15 01:39:07,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:07,835 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-15 01:39:07,835 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 01:39:07,835 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-15 01:39:07,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 01:39:07,836 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:07,836 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 01:39:08,040 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:08,041 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:08,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:08,042 INFO L82 PathProgramCache]: Analyzing trace with hash -2041914692, now seen corresponding path program 3 times [2019-10-15 01:39:08,042 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:08,042 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [524402142] [2019-10-15 01:39:08,043 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:08,043 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:08,043 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:08,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:08,192 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:08,192 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [524402142] [2019-10-15 01:39:08,193 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775589973] [2019-10-15 01:39:08,193 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 [2019-10-15 01:39:08,291 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:39:08,292 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:08,293 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-15 01:39:08,295 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:08,885 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:39:08,885 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:09,001 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 8 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:39:09,001 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1283333622] [2019-10-15 01:39:09,003 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:09,003 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:09,003 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:09,003 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:09,003 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:09,034 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:39:10,436 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 56 for LOIs [2019-10-15 01:39:10,451 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:10,464 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:11,216 WARN L191 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2019-10-15 01:39:11,719 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:11,719 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 10, 13] total 36 [2019-10-15 01:39:11,719 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807069247] [2019-10-15 01:39:11,720 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-15 01:39:11,721 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:11,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-15 01:39:11,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1126, Unknown=0, NotChecked=0, Total=1260 [2019-10-15 01:39:11,724 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 36 states. [2019-10-15 01:39:14,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:14,529 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2019-10-15 01:39:14,529 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 01:39:14,530 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 28 [2019-10-15 01:39:14,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:14,532 INFO L225 Difference]: With dead ends: 41 [2019-10-15 01:39:14,532 INFO L226 Difference]: Without dead ends: 39 [2019-10-15 01:39:14,534 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 55 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=401, Invalid=2679, Unknown=0, NotChecked=0, Total=3080 [2019-10-15 01:39:14,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-15 01:39:14,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 32. [2019-10-15 01:39:14,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:39:14,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-15 01:39:14,546 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28 [2019-10-15 01:39:14,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:14,547 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-15 01:39:14,547 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-15 01:39:14,547 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-15 01:39:14,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-15 01:39:14,548 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:14,548 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:39:14,752 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:14,752 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:14,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:14,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1135472851, now seen corresponding path program 4 times [2019-10-15 01:39:14,753 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:14,754 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252817265] [2019-10-15 01:39:14,754 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:14,754 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:14,754 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:14,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:14,830 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:14,831 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252817265] [2019-10-15 01:39:14,831 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816436232] [2019-10-15 01:39:14,831 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 [2019-10-15 01:39:14,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:14,933 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-15 01:39:14,935 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:14,978 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:14,978 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:39:15,035 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 21 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:15,035 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [412543414] [2019-10-15 01:39:15,037 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:39:15,037 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:39:15,038 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:39:15,038 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:39:15,038 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:39:15,064 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:39:16,462 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 69 for LOIs [2019-10-15 01:39:16,476 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:39:16,480 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:39:17,183 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 28 [2019-10-15 01:39:17,450 WARN L191 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 27 [2019-10-15 01:39:17,855 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:39:17,855 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 9, 13] total 29 [2019-10-15 01:39:17,855 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335126577] [2019-10-15 01:39:17,857 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-15 01:39:17,857 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:39:17,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-15 01:39:17,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=660, Unknown=0, NotChecked=0, Total=812 [2019-10-15 01:39:17,858 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 29 states. [2019-10-15 01:39:19,711 WARN L191 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 32 [2019-10-15 01:39:20,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:39:20,132 INFO L93 Difference]: Finished difference Result 60 states and 65 transitions. [2019-10-15 01:39:20,132 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-15 01:39:20,133 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 35 [2019-10-15 01:39:20,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:39:20,134 INFO L225 Difference]: With dead ends: 60 [2019-10-15 01:39:20,134 INFO L226 Difference]: Without dead ends: 33 [2019-10-15 01:39:20,137 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 949 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=495, Invalid=2475, Unknown=0, NotChecked=0, Total=2970 [2019-10-15 01:39:20,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2019-10-15 01:39:20,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2019-10-15 01:39:20,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-10-15 01:39:20,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 36 transitions. [2019-10-15 01:39:20,148 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 36 transitions. Word has length 35 [2019-10-15 01:39:20,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:39:20,149 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 36 transitions. [2019-10-15 01:39:20,149 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-15 01:39:20,149 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 36 transitions. [2019-10-15 01:39:20,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-10-15 01:39:20,150 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:39:20,150 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 01:39:20,354 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:39:20,355 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:39:20,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:39:20,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1319352111, now seen corresponding path program 5 times [2019-10-15 01:39:20,356 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:39:20,357 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384055478] [2019-10-15 01:39:20,357 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:20,357 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:39:20,357 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:39:20,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:39:20,704 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 9 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:20,705 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384055478] [2019-10-15 01:39:20,705 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840759084] [2019-10-15 01:39:20,705 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 [2019-10-15 01:39:20,836 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-15 01:39:20,837 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:39:20,838 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-15 01:39:20,841 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:39:21,420 WARN L191 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 99 DAG size of output: 74 [2019-10-15 01:39:21,536 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 45 [2019-10-15 01:39:23,677 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 5 proven. 22 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:39:23,678 INFO L321 TraceCheckSpWp]: Computing backward predicates...