java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/array-examples/standard_sentinel.i.v+cfa-reducer.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 01:35:03,166 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 01:35:03,169 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 01:35:03,187 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 01:35:03,187 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 01:35:03,189 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 01:35:03,191 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 01:35:03,200 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 01:35:03,205 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 01:35:03,207 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 01:35:03,208 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 01:35:03,210 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 01:35:03,210 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 01:35:03,212 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 01:35:03,214 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 01:35:03,215 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 01:35:03,216 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 01:35:03,217 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 01:35:03,219 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 01:35:03,223 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 01:35:03,227 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 01:35:03,229 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 01:35:03,232 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 01:35:03,232 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 01:35:03,234 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 01:35:03,245 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 01:35:03,246 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 01:35:03,247 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 01:35:03,247 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 01:35:03,280 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 01:35:03,281 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 01:35:03,284 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 01:35:03,284 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 01:35:03,285 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 01:35:03,285 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 01:35:03,285 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 01:35:03,285 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 01:35:03,285 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 01:35:03,286 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 01:35:03,286 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 01:35:03,286 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 01:35:03,286 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 01:35:03,286 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 01:35:03,286 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 01:35:03,287 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 01:35:03,287 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 01:35:03,287 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 01:35:03,287 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 01:35:03,287 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 01:35:03,288 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 01:35:03,288 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 01:35:03,288 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 01:35:03,288 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 01:35:03,288 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 01:35:03,289 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 01:35:03,289 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 01:35:03,289 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 01:35:03,289 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 01:35:03,556 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 01:35:03,568 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 01:35:03,572 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 01:35:03,573 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 01:35:03,574 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 01:35:03,574 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_sentinel.i.v+cfa-reducer.c [2019-10-15 01:35:03,652 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d03d5a525/ed2df1f546a9447aa8ef54b09b999bb0/FLAG5fa5d8414 [2019-10-15 01:35:04,106 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 01:35:04,107 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_sentinel.i.v+cfa-reducer.c [2019-10-15 01:35:04,114 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d03d5a525/ed2df1f546a9447aa8ef54b09b999bb0/FLAG5fa5d8414 [2019-10-15 01:35:04,458 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d03d5a525/ed2df1f546a9447aa8ef54b09b999bb0 [2019-10-15 01:35:04,467 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 01:35:04,472 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 01:35:04,473 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 01:35:04,473 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 01:35:04,477 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 01:35:04,478 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,481 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c0cb938 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04, skipping insertion in model container [2019-10-15 01:35:04,481 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,490 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 01:35:04,510 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 01:35:04,681 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:35:04,685 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 01:35:04,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 01:35:04,737 INFO L192 MainTranslator]: Completed translation [2019-10-15 01:35:04,738 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04 WrapperNode [2019-10-15 01:35:04,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 01:35:04,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 01:35:04,739 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 01:35:04,739 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 01:35:04,823 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,830 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,832 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,838 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,842 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,844 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (1/1) ... [2019-10-15 01:35:04,846 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 01:35:04,846 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 01:35:04,846 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 01:35:04,846 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 01:35:04,847 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (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 01:35:04,907 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 01:35:04,907 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 01:35:04,908 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 01:35:04,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 01:35:04,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-15 01:35:04,908 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 01:35:04,908 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 01:35:04,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 01:35:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 01:35:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 01:35:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 01:35:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 01:35:04,909 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 01:35:05,167 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 01:35:05,167 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 01:35:05,169 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:35:05 BoogieIcfgContainer [2019-10-15 01:35:05,169 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 01:35:05,171 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 01:35:05,171 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 01:35:05,176 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 01:35:05,176 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 01:35:04" (1/3) ... [2019-10-15 01:35:05,177 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a4a729 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:35:05, skipping insertion in model container [2019-10-15 01:35:05,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 01:35:04" (2/3) ... [2019-10-15 01:35:05,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@10a4a729 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 01:35:05, skipping insertion in model container [2019-10-15 01:35:05,178 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 01:35:05" (3/3) ... [2019-10-15 01:35:05,180 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_sentinel.i.v+cfa-reducer.c [2019-10-15 01:35:05,193 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 01:35:05,201 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 01:35:05,215 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 01:35:05,238 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 01:35:05,238 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 01:35:05,239 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 01:35:05,239 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 01:35:05,239 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 01:35:05,239 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 01:35:05,239 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 01:35:05,239 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 01:35:05,256 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-10-15 01:35:05,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-10-15 01:35:05,263 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:05,264 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:05,266 INFO L410 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:05,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:05,272 INFO L82 PathProgramCache]: Analyzing trace with hash 882124697, now seen corresponding path program 1 times [2019-10-15 01:35:05,281 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:05,281 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [781298574] [2019-10-15 01:35:05,281 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:05,282 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:05,282 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:05,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:05,485 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 01:35:05,486 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [781298574] [2019-10-15 01:35:05,487 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:35:05,487 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 01:35:05,487 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685818538] [2019-10-15 01:35:05,493 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 01:35:05,494 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:05,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 01:35:05,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 01:35:05,509 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2019-10-15 01:35:05,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:05,540 INFO L93 Difference]: Finished difference Result 29 states and 37 transitions. [2019-10-15 01:35:05,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 01:35:05,542 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2019-10-15 01:35:05,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:05,550 INFO L225 Difference]: With dead ends: 29 [2019-10-15 01:35:05,551 INFO L226 Difference]: Without dead ends: 14 [2019-10-15 01:35:05,554 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 01:35:05,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-15 01:35:05,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-15 01:35:05,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-15 01:35:05,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-15 01:35:05,586 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 12 [2019-10-15 01:35:05,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:05,587 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-15 01:35:05,587 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 01:35:05,587 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-15 01:35:05,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-15 01:35:05,588 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:05,588 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:05,589 INFO L410 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:05,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:05,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1345624393, now seen corresponding path program 1 times [2019-10-15 01:35:05,590 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:05,590 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149868125] [2019-10-15 01:35:05,590 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:05,590 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:05,591 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:05,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:05,683 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 01:35:05,683 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149868125] [2019-10-15 01:35:05,684 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 01:35:05,684 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 01:35:05,684 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138108822] [2019-10-15 01:35:05,686 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 01:35:05,686 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:05,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 01:35:05,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-10-15 01:35:05,688 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2019-10-15 01:35:05,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:05,754 INFO L93 Difference]: Finished difference Result 19 states and 20 transitions. [2019-10-15 01:35:05,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-15 01:35:05,756 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2019-10-15 01:35:05,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:05,757 INFO L225 Difference]: With dead ends: 19 [2019-10-15 01:35:05,758 INFO L226 Difference]: Without dead ends: 16 [2019-10-15 01:35:05,759 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2019-10-15 01:35:05,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-10-15 01:35:05,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-10-15 01:35:05,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-10-15 01:35:05,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2019-10-15 01:35:05,766 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 13 [2019-10-15 01:35:05,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:05,766 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2019-10-15 01:35:05,766 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 01:35:05,767 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2019-10-15 01:35:05,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-15 01:35:05,767 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:05,768 INFO L380 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:05,768 INFO L410 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:05,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:05,768 INFO L82 PathProgramCache]: Analyzing trace with hash 357797452, now seen corresponding path program 1 times [2019-10-15 01:35:05,769 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:05,769 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494082771] [2019-10-15 01:35:05,769 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:05,770 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:05,770 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:05,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:05,853 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:35:05,853 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494082771] [2019-10-15 01:35:05,853 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784401570] [2019-10-15 01:35:05,854 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 01:35:05,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:05,909 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 01:35:05,915 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:05,950 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:35:05,950 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:05,979 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:35:05,979 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1180759410] [2019-10-15 01:35:06,004 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:06,005 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:06,011 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:06,018 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:06,019 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:06,271 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2019-10-15 01:35:06,619 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:06,628 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:07,118 WARN L191 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 36 [2019-10-15 01:35:07,121 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:07,121 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 11] total 17 [2019-10-15 01:35:07,121 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [530357075] [2019-10-15 01:35:07,123 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-15 01:35:07,123 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:07,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-15 01:35:07,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2019-10-15 01:35:07,125 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 17 states. [2019-10-15 01:35:07,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:07,618 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2019-10-15 01:35:07,619 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-15 01:35:07,619 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 15 [2019-10-15 01:35:07,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:07,620 INFO L225 Difference]: With dead ends: 28 [2019-10-15 01:35:07,620 INFO L226 Difference]: Without dead ends: 19 [2019-10-15 01:35:07,621 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=142, Invalid=614, Unknown=0, NotChecked=0, Total=756 [2019-10-15 01:35:07,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2019-10-15 01:35:07,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2019-10-15 01:35:07,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-15 01:35:07,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2019-10-15 01:35:07,630 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2019-10-15 01:35:07,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:07,630 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2019-10-15 01:35:07,631 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-15 01:35:07,631 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2019-10-15 01:35:07,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 01:35:07,632 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:07,632 INFO L380 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:07,837 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:07,837 INFO L410 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:07,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:07,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1083919204, now seen corresponding path program 2 times [2019-10-15 01:35:07,838 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:07,838 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1923531133] [2019-10-15 01:35:07,838 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:07,838 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:07,839 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:07,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:07,910 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-15 01:35:07,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1923531133] [2019-10-15 01:35:07,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749018708] [2019-10-15 01:35:07,911 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 01:35:07,963 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-15 01:35:07,963 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:07,964 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-15 01:35:07,966 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:08,093 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:35:08,093 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:08,203 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 01:35:08,203 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1072310063] [2019-10-15 01:35:08,204 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:08,205 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:08,205 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:08,205 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:08,206 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:08,245 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-10-15 01:35:08,462 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:08,469 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:09,045 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:09,045 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 11] total 26 [2019-10-15 01:35:09,046 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268299303] [2019-10-15 01:35:09,046 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-15 01:35:09,047 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:09,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-15 01:35:09,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=557, Unknown=0, NotChecked=0, Total=650 [2019-10-15 01:35:09,048 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 26 states. [2019-10-15 01:35:10,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:10,258 INFO L93 Difference]: Finished difference Result 35 states and 39 transitions. [2019-10-15 01:35:10,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-15 01:35:10,259 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 18 [2019-10-15 01:35:10,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:10,260 INFO L225 Difference]: With dead ends: 35 [2019-10-15 01:35:10,260 INFO L226 Difference]: Without dead ends: 24 [2019-10-15 01:35:10,261 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=330, Invalid=1740, Unknown=0, NotChecked=0, Total=2070 [2019-10-15 01:35:10,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-15 01:35:10,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-15 01:35:10,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-15 01:35:10,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2019-10-15 01:35:10,270 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2019-10-15 01:35:10,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:10,271 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2019-10-15 01:35:10,271 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-15 01:35:10,271 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2019-10-15 01:35:10,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-15 01:35:10,272 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:10,272 INFO L380 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:10,477 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:10,477 INFO L410 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:10,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:10,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1250401810, now seen corresponding path program 3 times [2019-10-15 01:35:10,479 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:10,479 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928159431] [2019-10-15 01:35:10,480 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:10,480 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:10,480 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:10,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:10,559 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:10,560 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928159431] [2019-10-15 01:35:10,560 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685810114] [2019-10-15 01:35:10,561 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 01:35:10,633 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:35:10,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:10,634 INFO L256 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-15 01:35:10,638 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:10,675 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:10,675 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:10,754 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:10,754 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1995759393] [2019-10-15 01:35:10,756 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:10,756 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:10,757 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:10,757 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:10,757 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:10,797 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2019-10-15 01:35:10,987 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:10,993 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:11,386 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:11,386 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 11] total 25 [2019-10-15 01:35:11,387 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119697486] [2019-10-15 01:35:11,387 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-15 01:35:11,388 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:11,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-15 01:35:11,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2019-10-15 01:35:11,388 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 25 states. [2019-10-15 01:35:12,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:12,093 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2019-10-15 01:35:12,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 01:35:12,093 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 23 [2019-10-15 01:35:12,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:12,094 INFO L225 Difference]: With dead ends: 44 [2019-10-15 01:35:12,095 INFO L226 Difference]: Without dead ends: 31 [2019-10-15 01:35:12,096 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 510 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=378, Invalid=1514, Unknown=0, NotChecked=0, Total=1892 [2019-10-15 01:35:12,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-15 01:35:12,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-15 01:35:12,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-15 01:35:12,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2019-10-15 01:35:12,102 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 23 [2019-10-15 01:35:12,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:12,103 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2019-10-15 01:35:12,103 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-15 01:35:12,103 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2019-10-15 01:35:12,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 01:35:12,104 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:12,104 INFO L380 BasicCegarLoop]: trace histogram [12, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:12,308 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:12,308 INFO L410 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:12,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:12,309 INFO L82 PathProgramCache]: Analyzing trace with hash -900767646, now seen corresponding path program 4 times [2019-10-15 01:35:12,309 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:12,309 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847905660] [2019-10-15 01:35:12,309 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:12,309 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:12,309 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:12,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:12,471 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:12,472 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847905660] [2019-10-15 01:35:12,472 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153874069] [2019-10-15 01:35:12,472 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 01:35:12,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:12,539 INFO L256 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 01:35:12,541 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:12,555 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:12,555 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:12,797 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:12,797 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [158315582] [2019-10-15 01:35:12,799 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:12,799 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:12,799 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:12,800 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:12,800 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:12,852 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-10-15 01:35:13,032 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:13,037 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:13,459 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:13,459 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 11] total 39 [2019-10-15 01:35:13,459 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630574291] [2019-10-15 01:35:13,460 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-15 01:35:13,461 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:13,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-15 01:35:13,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=442, Invalid=1040, Unknown=0, NotChecked=0, Total=1482 [2019-10-15 01:35:13,463 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 39 states. [2019-10-15 01:35:14,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:14,752 INFO L93 Difference]: Finished difference Result 58 states and 73 transitions. [2019-10-15 01:35:14,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-15 01:35:14,752 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 30 [2019-10-15 01:35:14,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:14,753 INFO L225 Difference]: With dead ends: 58 [2019-10-15 01:35:14,753 INFO L226 Difference]: Without dead ends: 45 [2019-10-15 01:35:14,757 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1294 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1253, Invalid=3859, Unknown=0, NotChecked=0, Total=5112 [2019-10-15 01:35:14,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-15 01:35:14,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2019-10-15 01:35:14,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-15 01:35:14,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2019-10-15 01:35:14,764 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 30 [2019-10-15 01:35:14,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:14,765 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2019-10-15 01:35:14,765 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-15 01:35:14,765 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2019-10-15 01:35:14,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-15 01:35:14,766 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:14,766 INFO L380 BasicCegarLoop]: trace histogram [26, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:14,970 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:14,971 INFO L410 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:14,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:14,972 INFO L82 PathProgramCache]: Analyzing trace with hash -1717249438, now seen corresponding path program 5 times [2019-10-15 01:35:14,972 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:14,972 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930548235] [2019-10-15 01:35:14,973 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:14,973 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:14,973 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:15,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:15,405 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-10-15 01:35:15,406 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930548235] [2019-10-15 01:35:15,406 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999142971] [2019-10-15 01:35:15,406 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 01:35:15,494 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-15 01:35:15,494 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:15,496 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-15 01:35:15,499 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:15,977 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-10-15 01:35:15,977 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-10-15 01:35:16,351 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1548967461] [2019-10-15 01:35:16,353 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:16,353 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:16,353 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:16,354 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:16,354 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:16,403 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-10-15 01:35:16,575 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:16,580 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:17,276 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:17,277 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 11, 11, 11] total 56 [2019-10-15 01:35:17,277 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378198843] [2019-10-15 01:35:17,278 INFO L442 AbstractCegarLoop]: Interpolant automaton has 56 states [2019-10-15 01:35:17,278 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:17,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2019-10-15 01:35:17,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=532, Invalid=2548, Unknown=0, NotChecked=0, Total=3080 [2019-10-15 01:35:17,280 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 56 states. [2019-10-15 01:35:19,884 WARN L191 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 67 [2019-10-15 01:35:21,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:21,171 INFO L93 Difference]: Finished difference Result 69 states and 75 transitions. [2019-10-15 01:35:21,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2019-10-15 01:35:21,171 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 44 [2019-10-15 01:35:21,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:21,173 INFO L225 Difference]: With dead ends: 69 [2019-10-15 01:35:21,173 INFO L226 Difference]: Without dead ends: 54 [2019-10-15 01:35:21,177 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2713 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=1746, Invalid=9384, Unknown=0, NotChecked=0, Total=11130 [2019-10-15 01:35:21,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-15 01:35:21,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-10-15 01:35:21,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-15 01:35:21,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2019-10-15 01:35:21,185 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 44 [2019-10-15 01:35:21,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:21,186 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2019-10-15 01:35:21,186 INFO L463 AbstractCegarLoop]: Interpolant automaton has 56 states. [2019-10-15 01:35:21,186 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2019-10-15 01:35:21,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-15 01:35:21,187 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:21,187 INFO L380 BasicCegarLoop]: trace histogram [27, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:21,390 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:21,391 INFO L410 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:21,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:21,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1906505058, now seen corresponding path program 6 times [2019-10-15 01:35:21,392 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:21,392 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [747174380] [2019-10-15 01:35:21,393 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:21,393 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:21,393 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:21,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:21,894 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:35:21,894 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [747174380] [2019-10-15 01:35:21,895 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771790839] [2019-10-15 01:35:21,895 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 01:35:21,994 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-15 01:35:21,995 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 01:35:21,996 INFO L256 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-15 01:35:21,999 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:22,011 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:35:22,012 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:22,877 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:35:22,878 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [319745791] [2019-10-15 01:35:22,879 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:22,879 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:22,879 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:22,879 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:22,880 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:22,906 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 29 for LOIs [2019-10-15 01:35:23,009 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:23,013 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:23,518 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:23,518 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 11] total 69 [2019-10-15 01:35:23,518 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915108003] [2019-10-15 01:35:23,520 INFO L442 AbstractCegarLoop]: Interpolant automaton has 69 states [2019-10-15 01:35:23,520 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:23,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2019-10-15 01:35:23,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1747, Invalid=2945, Unknown=0, NotChecked=0, Total=4692 [2019-10-15 01:35:23,522 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 69 states. [2019-10-15 01:35:26,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:26,743 INFO L93 Difference]: Finished difference Result 104 states and 134 transitions. [2019-10-15 01:35:26,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2019-10-15 01:35:26,743 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 53 [2019-10-15 01:35:26,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:26,745 INFO L225 Difference]: With dead ends: 104 [2019-10-15 01:35:26,745 INFO L226 Difference]: Without dead ends: 83 [2019-10-15 01:35:26,751 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3799 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5108, Invalid=12184, Unknown=0, NotChecked=0, Total=17292 [2019-10-15 01:35:26,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-10-15 01:35:26,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 83. [2019-10-15 01:35:26,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-10-15 01:35:26,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 84 transitions. [2019-10-15 01:35:26,763 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 84 transitions. Word has length 53 [2019-10-15 01:35:26,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:26,763 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 84 transitions. [2019-10-15 01:35:26,763 INFO L463 AbstractCegarLoop]: Interpolant automaton has 69 states. [2019-10-15 01:35:26,763 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 84 transitions. [2019-10-15 01:35:26,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-10-15 01:35:26,765 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:26,765 INFO L380 BasicCegarLoop]: trace histogram [56, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:26,969 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:26,970 INFO L410 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:26,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:26,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1261810414, now seen corresponding path program 7 times [2019-10-15 01:35:26,971 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:26,971 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896355354] [2019-10-15 01:35:26,971 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:26,971 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:26,972 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:28,335 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:35:28,336 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896355354] [2019-10-15 01:35:28,336 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990007266] [2019-10-15 01:35:28,336 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 01:35:28,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 01:35:28,480 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 58 conjunts are in the unsatisfiable core [2019-10-15 01:35:28,484 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 01:35:28,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:35:28,509 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 01:35:32,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1652 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-15 01:35:32,009 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809046806] [2019-10-15 01:35:32,011 INFO L162 IcfgInterpreter]: Started Sifa with 13 locations of interest [2019-10-15 01:35:32,011 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 01:35:32,011 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 01:35:32,012 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 01:35:32,012 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 01:35:32,038 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 31 for LOIs [2019-10-15 01:35:32,129 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 16 for LOIs [2019-10-15 01:35:32,133 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 01:35:32,795 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 01:35:32,796 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59, 11] total 127 [2019-10-15 01:35:32,796 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234456134] [2019-10-15 01:35:32,798 INFO L442 AbstractCegarLoop]: Interpolant automaton has 127 states [2019-10-15 01:35:32,798 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 01:35:32,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2019-10-15 01:35:32,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6822, Invalid=9180, Unknown=0, NotChecked=0, Total=16002 [2019-10-15 01:35:32,804 INFO L87 Difference]: Start difference. First operand 83 states and 84 transitions. Second operand 127 states. [2019-10-15 01:35:42,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 01:35:42,405 INFO L93 Difference]: Finished difference Result 162 states and 221 transitions. [2019-10-15 01:35:42,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2019-10-15 01:35:42,406 INFO L78 Accepts]: Start accepts. Automaton has 127 states. Word has length 82 [2019-10-15 01:35:42,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 01:35:42,408 INFO L225 Difference]: With dead ends: 162 [2019-10-15 01:35:42,408 INFO L226 Difference]: Without dead ends: 141 [2019-10-15 01:35:42,412 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 425 GetRequests, 179 SyntacticMatches, 0 SemanticMatches, 246 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11832 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=20217, Invalid=41039, Unknown=0, NotChecked=0, Total=61256 [2019-10-15 01:35:42,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-10-15 01:35:42,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2019-10-15 01:35:42,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-10-15 01:35:42,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 142 transitions. [2019-10-15 01:35:42,429 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 142 transitions. Word has length 82 [2019-10-15 01:35:42,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 01:35:42,430 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 142 transitions. [2019-10-15 01:35:42,430 INFO L463 AbstractCegarLoop]: Interpolant automaton has 127 states. [2019-10-15 01:35:42,430 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 142 transitions. [2019-10-15 01:35:42,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2019-10-15 01:35:42,432 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 01:35:42,432 INFO L380 BasicCegarLoop]: trace histogram [114, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 01:35:42,643 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 01:35:42,643 INFO L410 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 01:35:42,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 01:35:42,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1778012398, now seen corresponding path program 8 times [2019-10-15 01:35:42,644 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 01:35:42,644 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855102159] [2019-10-15 01:35:42,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:42,644 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 01:35:42,644 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 01:35:42,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat