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-crafted/zero_sum_const_m2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:31:01,940 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:31:01,944 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:31:01,962 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:31:01,962 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:31:01,965 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:31:01,967 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:31:01,976 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:31:01,981 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:31:01,984 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:31:01,986 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:31:01,987 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:31:01,987 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:31:01,989 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:31:01,992 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:31:01,993 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:31:01,995 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:31:01,996 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:31:01,997 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:31:02,002 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:31:02,007 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:31:02,010 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:31:02,012 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:31:02,013 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:31:02,015 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 01:31:02,015 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 01:31:02,015 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 01:31:02,017 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 01:31:02,018 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 01:31:02,019 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 01:31:02,019 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 01:31:02,021 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 01:31:02,022 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 01:31:02,023 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 01:31:02,024 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 01:31:02,024 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 01:31:02,025 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 01:31:02,025 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 01:31:02,026 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:31:02,026 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:31:02,028 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:31:02,029 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 01:31:02,063 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:31:02,063 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:31:02,064 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:31:02,064 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:31:02,065 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:31:02,065 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:31:02,065 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:31:02,065 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:31:02,065 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:31:02,066 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:31:02,066 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:31:02,066 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:31:02,066 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:31:02,066 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:31:02,067 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:31:02,067 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:31:02,067 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:31:02,067 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:31:02,067 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:31:02,068 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:31:02,068 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:31:02,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:31:02,068 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:31:02,068 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:31:02,069 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:31:02,069 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:31:02,069 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:31:02,069 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:31:02,069 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 01:31:02,371 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:31:02,385 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:31:02,391 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:31:02,396 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:31:02,396 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:31:02,397 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-crafted/zero_sum_const_m2.c [2019-10-15 01:31:02,473 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/edeadc0fb/ab0e0ff43ae34574893f3cdf8a237a20/FLAG820b4663a [2019-10-15 01:31:02,944 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:31:02,945 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-crafted/zero_sum_const_m2.c [2019-10-15 01:31:02,952 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/edeadc0fb/ab0e0ff43ae34574893f3cdf8a237a20/FLAG820b4663a [2019-10-15 01:31:03,368 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/edeadc0fb/ab0e0ff43ae34574893f3cdf8a237a20 [2019-10-15 01:31:03,379 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:31:03,381 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:31:03,382 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:03,382 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:31:03,386 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:31:03,388 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,391 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@644c4853 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03, skipping insertion in model container [2019-10-15 01:31:03,391 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,399 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:31:03,421 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:31:03,604 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:03,615 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:31:03,634 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:31:03,649 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:31:03,650 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03 WrapperNode [2019-10-15 01:31:03,650 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:31:03,650 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:31:03,651 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:31:03,651 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:31:03,736 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,737 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,745 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,745 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,759 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,765 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,767 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (1/1) ... [2019-10-15 01:31:03,769 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:31:03,769 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:31:03,769 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:31:03,769 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:31:03,770 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (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 01:31:03,839 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:31:03,839 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:31:03,839 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 01:31:03,839 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:31:03,840 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:31:03,840 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 01:31:03,840 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:31:03,840 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_long [2019-10-15 01:31:03,840 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2019-10-15 01:31:03,840 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:31:03,841 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2019-10-15 01:31:03,841 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:31:03,841 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:31:03,841 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:31:03,841 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:31:03,841 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:31:04,259 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:31:04,259 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-15 01:31:04,260 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:04 BoogieIcfgContainer [2019-10-15 01:31:04,260 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:31:04,262 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:31:04,262 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:31:04,265 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:31:04,265 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:31:03" (1/3) ... [2019-10-15 01:31:04,266 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35b88829 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:04, skipping insertion in model container [2019-10-15 01:31:04,266 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:31:03" (2/3) ... [2019-10-15 01:31:04,267 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35b88829 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:31:04, skipping insertion in model container [2019-10-15 01:31:04,267 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:31:04" (3/3) ... [2019-10-15 01:31:04,269 INFO L109 eAbstractionObserver]: Analyzing ICFG zero_sum_const_m2.c [2019-10-15 01:31:04,278 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:31:04,286 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:31:04,300 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:31:04,323 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:31:04,323 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:31:04,323 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:31:04,324 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:31:04,324 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:31:04,324 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:31:04,324 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:31:04,324 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:31:04,339 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2019-10-15 01:31:04,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:31:04,344 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:04,345 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:04,347 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:04,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:04,351 INFO L82 PathProgramCache]: Analyzing trace with hash -1821330543, now seen corresponding path program 1 times [2019-10-15 01:31:04,359 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:04,359 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339252578] [2019-10-15 01:31:04,359 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:04,359 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:04,360 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:04,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:04,575 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 01:31:04,576 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339252578] [2019-10-15 01:31:04,578 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:04,578 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:31:04,580 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805796262] [2019-10-15 01:31:04,585 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:31:04,585 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:04,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:31:04,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:31:04,604 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 5 states. [2019-10-15 01:31:04,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:04,687 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2019-10-15 01:31:04,688 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 01:31:04,689 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2019-10-15 01:31:04,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:04,700 INFO L225 Difference]: With dead ends: 41 [2019-10-15 01:31:04,700 INFO L226 Difference]: Without dead ends: 20 [2019-10-15 01:31:04,704 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:31:04,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-15 01:31:04,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-15 01:31:04,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-15 01:31:04,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2019-10-15 01:31:04,750 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 15 [2019-10-15 01:31:04,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:04,750 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2019-10-15 01:31:04,751 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:31:04,751 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2019-10-15 01:31:04,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-15 01:31:04,752 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:04,752 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:04,753 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:04,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:04,753 INFO L82 PathProgramCache]: Analyzing trace with hash 780224693, now seen corresponding path program 1 times [2019-10-15 01:31:04,754 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:04,754 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851946789] [2019-10-15 01:31:04,754 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:04,754 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:04,755 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:04,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:04,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 01:31:04,857 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851946789] [2019-10-15 01:31:04,857 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:04,858 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:31:04,858 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044592082] [2019-10-15 01:31:04,859 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:31:04,860 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:04,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:31:04,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:31:04,861 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand 3 states. [2019-10-15 01:31:04,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:04,909 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2019-10-15 01:31:04,910 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:31:04,910 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-15 01:31:04,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:04,911 INFO L225 Difference]: With dead ends: 34 [2019-10-15 01:31:04,911 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 01:31:04,913 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 01:31:04,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 01:31:04,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 01:31:04,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:31:04,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2019-10-15 01:31:04,919 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 16 [2019-10-15 01:31:04,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:04,920 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2019-10-15 01:31:04,920 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:31:04,920 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2019-10-15 01:31:04,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-15 01:31:04,921 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:04,922 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:04,922 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:04,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:04,922 INFO L82 PathProgramCache]: Analyzing trace with hash 2044161761, now seen corresponding path program 1 times [2019-10-15 01:31:04,923 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:04,923 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472841556] [2019-10-15 01:31:04,923 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:04,924 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:04,924 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:04,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:05,018 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:31:05,018 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472841556] [2019-10-15 01:31:05,019 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:31:05,019 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-15 01:31:05,019 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810909175] [2019-10-15 01:31:05,020 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-15 01:31:05,020 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:05,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-15 01:31:05,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:05,021 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand 4 states. [2019-10-15 01:31:05,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:05,076 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2019-10-15 01:31:05,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-15 01:31:05,077 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-15 01:31:05,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:05,078 INFO L225 Difference]: With dead ends: 32 [2019-10-15 01:31:05,078 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 01:31:05,079 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2019-10-15 01:31:05,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 01:31:05,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 01:31:05,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 01:31:05,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-10-15 01:31:05,085 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 17 [2019-10-15 01:31:05,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:05,086 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-10-15 01:31:05,086 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-15 01:31:05,086 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-10-15 01:31:05,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 01:31:05,087 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:05,087 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:05,087 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:05,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:05,088 INFO L82 PathProgramCache]: Analyzing trace with hash -791089743, now seen corresponding path program 1 times [2019-10-15 01:31:05,088 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:05,088 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013687218] [2019-10-15 01:31:05,089 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:05,089 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:05,089 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:05,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:05,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:31:05,169 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013687218] [2019-10-15 01:31:05,169 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153841164] [2019-10-15 01:31:05,170 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 01:31:05,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:05,241 INFO L256 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:05,248 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:05,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:31:05,307 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:05,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-15 01:31:05,358 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [912067226] [2019-10-15 01:31:05,385 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:05,385 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:05,393 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:05,401 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:05,401 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:05,605 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:06,933 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:07,004 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:07,015 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:07,494 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:07,919 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 21 [2019-10-15 01:31:07,921 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:07,921 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 18 [2019-10-15 01:31:07,922 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070332552] [2019-10-15 01:31:07,924 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-15 01:31:07,925 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:07,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-15 01:31:07,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2019-10-15 01:31:07,927 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 18 states. [2019-10-15 01:31:08,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:08,601 INFO L93 Difference]: Finished difference Result 35 states and 43 transitions. [2019-10-15 01:31:08,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:31:08,602 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 20 [2019-10-15 01:31:08,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:08,602 INFO L225 Difference]: With dead ends: 35 [2019-10-15 01:31:08,603 INFO L226 Difference]: Without dead ends: 22 [2019-10-15 01:31:08,604 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 156 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:31:08,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-10-15 01:31:08,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-10-15 01:31:08,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-15 01:31:08,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2019-10-15 01:31:08,611 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2019-10-15 01:31:08,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:08,612 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2019-10-15 01:31:08,612 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-15 01:31:08,612 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2019-10-15 01:31:08,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-15 01:31:08,613 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:08,613 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:08,816 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:08,817 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:08,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:08,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1692918307, now seen corresponding path program 2 times [2019-10-15 01:31:08,818 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:08,818 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132519062] [2019-10-15 01:31:08,819 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:08,820 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:08,820 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:08,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:08,898 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:08,899 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132519062] [2019-10-15 01:31:08,899 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106901082] [2019-10-15 01:31:08,899 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 01:31:08,966 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:31:08,966 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:08,968 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-15 01:31:08,975 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:08,998 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:08,999 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:09,024 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:09,025 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1413618445] [2019-10-15 01:31:09,026 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:09,027 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:09,027 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:09,027 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:09,028 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:09,067 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:09,842 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:09,878 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:09,883 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:10,644 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 21 [2019-10-15 01:31:10,644 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:10,645 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 11] total 19 [2019-10-15 01:31:10,645 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323477714] [2019-10-15 01:31:10,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 01:31:10,646 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:10,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 01:31:10,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2019-10-15 01:31:10,647 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 19 states. [2019-10-15 01:31:11,011 WARN L191 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 28 [2019-10-15 01:31:11,692 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 34 [2019-10-15 01:31:11,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:11,770 INFO L93 Difference]: Finished difference Result 37 states and 47 transitions. [2019-10-15 01:31:11,770 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-15 01:31:11,770 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 21 [2019-10-15 01:31:11,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:11,772 INFO L225 Difference]: With dead ends: 37 [2019-10-15 01:31:11,772 INFO L226 Difference]: Without dead ends: 26 [2019-10-15 01:31:11,773 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 47 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=143, Invalid=727, Unknown=0, NotChecked=0, Total=870 [2019-10-15 01:31:11,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-15 01:31:11,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-15 01:31:11,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-15 01:31:11,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2019-10-15 01:31:11,781 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 21 [2019-10-15 01:31:11,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:11,781 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2019-10-15 01:31:11,781 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 01:31:11,781 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2019-10-15 01:31:11,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-15 01:31:11,782 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:11,782 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:11,992 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:11,993 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:11,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:11,994 INFO L82 PathProgramCache]: Analyzing trace with hash 1878882833, now seen corresponding path program 3 times [2019-10-15 01:31:11,994 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:11,995 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791017306] [2019-10-15 01:31:11,995 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:11,995 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:11,995 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:12,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:12,887 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:12,887 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791017306] [2019-10-15 01:31:12,887 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769544154] [2019-10-15 01:31:12,887 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 01:31:12,960 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:12,960 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:12,961 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 45 conjunts are in the unsatisfiable core [2019-10-15 01:31:12,966 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:13,455 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:13,455 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:13,973 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-15 01:31:13,974 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [739382363] [2019-10-15 01:31:13,976 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:13,976 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:13,976 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:13,977 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:13,977 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:14,004 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:14,625 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:14,663 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:14,669 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:15,470 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:15,992 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:15,993 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 17, 15, 11] total 54 [2019-10-15 01:31:15,993 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042266373] [2019-10-15 01:31:15,994 INFO L442 AbstractCegarLoop]: Interpolant automaton has 54 states [2019-10-15 01:31:15,995 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:15,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2019-10-15 01:31:15,996 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=2678, Unknown=0, NotChecked=0, Total=2862 [2019-10-15 01:31:15,997 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand 54 states. [2019-10-15 01:31:18,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:18,993 INFO L93 Difference]: Finished difference Result 41 states and 48 transitions. [2019-10-15 01:31:18,994 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-15 01:31:18,994 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 25 [2019-10-15 01:31:18,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:18,995 INFO L225 Difference]: With dead ends: 41 [2019-10-15 01:31:18,996 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 01:31:18,999 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 38 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1529 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=368, Invalid=5332, Unknown=0, NotChecked=0, Total=5700 [2019-10-15 01:31:19,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 01:31:19,006 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-10-15 01:31:19,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-15 01:31:19,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-15 01:31:19,007 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 25 [2019-10-15 01:31:19,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:19,008 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-15 01:31:19,008 INFO L463 AbstractCegarLoop]: Interpolant automaton has 54 states. [2019-10-15 01:31:19,008 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-15 01:31:19,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-10-15 01:31:19,009 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:19,009 INFO L380 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:19,218 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:19,219 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:19,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:19,219 INFO L82 PathProgramCache]: Analyzing trace with hash -220862923, now seen corresponding path program 4 times [2019-10-15 01:31:19,220 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:19,220 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [494285888] [2019-10-15 01:31:19,221 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:19,221 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:19,222 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:19,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:31:19,305 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [494285888] [2019-10-15 01:31:19,306 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1646736545] [2019-10-15 01:31:19,306 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 01:31:19,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:19,384 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:19,386 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:19,424 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:31:19,425 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:19,459 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-15 01:31:19,459 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459960981] [2019-10-15 01:31:19,461 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:19,461 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:19,461 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:19,462 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:19,462 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:19,491 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:20,018 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:20,047 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:20,057 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:20,874 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:20,875 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 24 [2019-10-15 01:31:20,875 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778685837] [2019-10-15 01:31:20,876 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 01:31:20,877 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:20,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 01:31:20,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2019-10-15 01:31:20,878 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 24 states. [2019-10-15 01:31:21,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:21,975 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2019-10-15 01:31:21,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:31:21,979 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 26 [2019-10-15 01:31:21,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:21,983 INFO L225 Difference]: With dead ends: 66 [2019-10-15 01:31:21,983 INFO L226 Difference]: Without dead ends: 39 [2019-10-15 01:31:21,985 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 59 SyntacticMatches, 4 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 400 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=219, Invalid=1263, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:31:21,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-15 01:31:21,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2019-10-15 01:31:21,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:31:21,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-10-15 01:31:21,994 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 26 [2019-10-15 01:31:21,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:21,994 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-10-15 01:31:21,994 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 01:31:21,994 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-10-15 01:31:21,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-15 01:31:21,995 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:21,995 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:22,199 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:22,200 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:22,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:22,201 INFO L82 PathProgramCache]: Analyzing trace with hash 344147297, now seen corresponding path program 5 times [2019-10-15 01:31:22,201 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:22,201 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897405960] [2019-10-15 01:31:22,202 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:22,202 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:22,202 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:22,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:22,281 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:22,282 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897405960] [2019-10-15 01:31:22,282 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788169825] [2019-10-15 01:31:22,282 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 01:31:22,376 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 01:31:22,377 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:22,378 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-15 01:31:22,384 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:22,440 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:22,440 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:22,494 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:31:22,494 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2105056055] [2019-10-15 01:31:22,496 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:22,496 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:22,497 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:22,497 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:22,497 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:22,525 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 30 for LOIs [2019-10-15 01:31:23,000 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:23,024 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:23,029 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:23,801 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:23,801 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 11] total 25 [2019-10-15 01:31:23,802 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [828479565] [2019-10-15 01:31:23,803 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-15 01:31:23,803 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:23,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-15 01:31:23,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=512, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:31:23,804 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 25 states. [2019-10-15 01:31:25,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:25,023 INFO L93 Difference]: Finished difference Result 42 states and 48 transitions. [2019-10-15 01:31:25,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-15 01:31:25,023 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 27 [2019-10-15 01:31:25,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:25,025 INFO L225 Difference]: With dead ends: 42 [2019-10-15 01:31:25,025 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:31:25,026 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 60 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=213, Invalid=1269, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:31:25,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:31:25,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-15 01:31:25,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-15 01:31:25,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2019-10-15 01:31:25,033 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 27 [2019-10-15 01:31:25,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:25,033 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2019-10-15 01:31:25,034 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-15 01:31:25,034 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2019-10-15 01:31:25,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 01:31:25,034 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:25,035 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:25,238 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:25,242 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:25,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:25,242 INFO L82 PathProgramCache]: Analyzing trace with hash 339030193, now seen corresponding path program 6 times [2019-10-15 01:31:25,242 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:25,242 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344382000] [2019-10-15 01:31:25,242 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:25,243 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:25,243 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:25,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:25,984 WARN L191 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 39 [2019-10-15 01:31:26,152 WARN L191 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 39 [2019-10-15 01:31:26,304 WARN L191 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 43 [2019-10-15 01:31:26,468 WARN L191 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 43 [2019-10-15 01:31:26,730 WARN L191 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 39 [2019-10-15 01:31:26,897 WARN L191 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 42 [2019-10-15 01:31:27,518 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:27,519 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344382000] [2019-10-15 01:31:27,519 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468813539] [2019-10-15 01:31:27,519 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:27,626 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:31:27,627 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:31:27,628 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 63 conjunts are in the unsatisfiable core [2019-10-15 01:31:27,631 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:28,331 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 01:31:28,331 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:29,150 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-15 01:31:29,151 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [598672341] [2019-10-15 01:31:29,152 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:29,152 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:29,153 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:29,153 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:29,153 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:29,180 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:29,828 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:29,878 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:29,883 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:31,396 WARN L191 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 21 [2019-10-15 01:31:31,397 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:31,397 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 19, 11] total 69 [2019-10-15 01:31:31,398 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [738722883] [2019-10-15 01:31:31,399 INFO L442 AbstractCegarLoop]: Interpolant automaton has 69 states [2019-10-15 01:31:31,399 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:31,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2019-10-15 01:31:31,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=4447, Unknown=0, NotChecked=0, Total=4692 [2019-10-15 01:31:31,401 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 69 states. [2019-10-15 01:31:32,384 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 61 [2019-10-15 01:31:32,907 WARN L191 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 117 DAG size of output: 50 [2019-10-15 01:31:33,155 WARN L191 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 94 DAG size of output: 56 [2019-10-15 01:31:34,429 WARN L191 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 95 DAG size of output: 69 [2019-10-15 01:31:34,714 WARN L191 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 97 DAG size of output: 55 [2019-10-15 01:31:35,327 WARN L191 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 53 [2019-10-15 01:31:35,727 WARN L191 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 91 DAG size of output: 53 [2019-10-15 01:31:35,994 WARN L191 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 96 DAG size of output: 51 [2019-10-15 01:31:36,193 WARN L191 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 54 [2019-10-15 01:31:36,483 WARN L191 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 33 [2019-10-15 01:31:37,004 WARN L191 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 58 [2019-10-15 01:31:37,363 WARN L191 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 100 DAG size of output: 57 [2019-10-15 01:31:37,627 WARN L191 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 48 [2019-10-15 01:31:39,452 WARN L191 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 34 [2019-10-15 01:31:39,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:39,900 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2019-10-15 01:31:39,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2019-10-15 01:31:39,901 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 30 [2019-10-15 01:31:39,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:39,902 INFO L225 Difference]: With dead ends: 63 [2019-10-15 01:31:39,902 INFO L226 Difference]: Without dead ends: 55 [2019-10-15 01:31:39,906 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 44 SyntacticMatches, 3 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3210 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=852, Invalid=10920, Unknown=0, NotChecked=0, Total=11772 [2019-10-15 01:31:39,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-15 01:31:39,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32. [2019-10-15 01:31:39,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-15 01:31:39,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2019-10-15 01:31:39,916 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 30 [2019-10-15 01:31:39,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:39,917 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2019-10-15 01:31:39,917 INFO L463 AbstractCegarLoop]: Interpolant automaton has 69 states. [2019-10-15 01:31:39,917 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2019-10-15 01:31:39,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-10-15 01:31:39,918 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:39,918 INFO L380 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:40,121 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:40,122 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:40,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:40,123 INFO L82 PathProgramCache]: Analyzing trace with hash 1562119252, now seen corresponding path program 7 times [2019-10-15 01:31:40,123 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:40,123 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547239343] [2019-10-15 01:31:40,123 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:40,123 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:40,124 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:40,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:40,216 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:31:40,217 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547239343] [2019-10-15 01:31:40,217 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168571943] [2019-10-15 01:31:40,217 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:40,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:31:40,353 INFO L256 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-15 01:31:40,356 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:31:40,424 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:31:40,424 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:31:40,477 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-15 01:31:40,477 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016861426] [2019-10-15 01:31:40,478 INFO L162 IcfgInterpreter]: Started Sifa with 16 locations of interest [2019-10-15 01:31:40,478 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:31:40,479 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:31:40,479 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:31:40,479 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:31:40,502 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 32 for LOIs [2019-10-15 01:31:40,951 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 23 for LOIs [2019-10-15 01:31:40,979 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:31:40,983 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:31:41,459 WARN L191 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 26 [2019-10-15 01:31:41,848 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:31:41,848 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11] total 28 [2019-10-15 01:31:41,849 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276699335] [2019-10-15 01:31:41,850 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-15 01:31:41,850 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:31:41,850 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-15 01:31:41,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=643, Unknown=0, NotChecked=0, Total=756 [2019-10-15 01:31:41,851 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand 28 states. [2019-10-15 01:31:43,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:31:43,033 INFO L93 Difference]: Finished difference Result 71 states and 85 transitions. [2019-10-15 01:31:43,034 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-15 01:31:43,035 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 31 [2019-10-15 01:31:43,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:31:43,036 INFO L225 Difference]: With dead ends: 71 [2019-10-15 01:31:43,036 INFO L226 Difference]: Without dead ends: 36 [2019-10-15 01:31:43,038 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 70 SyntacticMatches, 7 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 643 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=292, Invalid=1688, Unknown=0, NotChecked=0, Total=1980 [2019-10-15 01:31:43,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-15 01:31:43,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-10-15 01:31:43,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 01:31:43,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 40 transitions. [2019-10-15 01:31:43,052 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 40 transitions. Word has length 31 [2019-10-15 01:31:43,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:31:43,052 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 40 transitions. [2019-10-15 01:31:43,052 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-15 01:31:43,052 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 40 transitions. [2019-10-15 01:31:43,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-15 01:31:43,061 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:31:43,062 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:31:43,265 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:31:43,265 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:31:43,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:31:43,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1011736431, now seen corresponding path program 8 times [2019-10-15 01:31:43,267 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:31:43,267 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44350623] [2019-10-15 01:31:43,267 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:43,268 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:31:43,268 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:31:43,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat