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/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:03:52,366 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:03:52,369 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:03:52,390 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:03:52,390 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:03:52,392 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:03:52,395 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:03:52,414 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:03:52,416 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:03:52,417 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:03:52,418 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:03:52,418 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:03:52,419 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:03:52,421 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:03:52,423 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:03:52,424 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:03:52,426 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:03:52,429 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:03:52,435 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:03:52,438 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:03:52,440 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:03:52,441 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:03:52,443 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:03:52,443 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:03:52,445 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-15 03:03:52,446 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-15 03:03:52,446 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-15 03:03:52,447 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-15 03:03:52,447 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-15 03:03:52,448 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-15 03:03:52,448 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 03:03:52,449 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 03:03:52,450 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 03:03:52,450 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 03:03:52,451 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 03:03:52,452 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 03:03:52,452 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 03:03:52,452 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 03:03:52,453 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:03:52,454 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:03:52,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:03:52,455 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 03:03:52,469 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:03:52,469 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:03:52,471 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:03:52,471 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:03:52,471 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:03:52,471 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:03:52,472 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:03:52,472 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:03:52,472 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:03:52,472 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:03:52,472 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:03:52,473 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:03:52,473 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:03:52,473 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:03:52,473 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:03:52,474 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:03:52,474 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:03:52,474 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:03:52,474 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:03:52,474 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:03:52,475 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:03:52,475 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:03:52,475 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:03:52,475 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:03:52,475 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:03:52,476 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:03:52,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:03:52,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:03:52,477 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 03:03:52,848 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:03:52,871 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:03:52,875 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:03:52,877 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:03:52,877 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:03:52,878 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2019-10-15 03:03:52,967 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0c1c92b52/8a6a24ec226f497a862ca018e6a303af/FLAG8fc0d78fa [2019-10-15 03:03:53,488 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:03:53,489 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2019-10-15 03:03:53,499 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0c1c92b52/8a6a24ec226f497a862ca018e6a303af/FLAG8fc0d78fa [2019-10-15 03:03:53,889 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0c1c92b52/8a6a24ec226f497a862ca018e6a303af [2019-10-15 03:03:53,901 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:03:53,902 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:03:53,904 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:03:53,905 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:03:53,908 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:03:53,909 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:03:53" (1/1) ... [2019-10-15 03:03:53,911 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6cfc3857 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:53, skipping insertion in model container [2019-10-15 03:03:53,911 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:03:53" (1/1) ... [2019-10-15 03:03:53,919 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:03:53,939 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:03:54,161 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:03:54,174 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:03:54,201 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:03:54,317 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:03:54,318 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54 WrapperNode [2019-10-15 03:03:54,318 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:03:54,319 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:03:54,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:03:54,319 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:03:54,335 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,335 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,348 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,348 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,360 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,367 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,370 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (1/1) ... [2019-10-15 03:03:54,377 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:03:54,378 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:03:54,378 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:03:54,378 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:03:54,383 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (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 03:03:54,446 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:03:54,446 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:03:54,446 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:03:54,446 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:03:54,446 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:03:54,447 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-10-15 03:03:54,447 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:03:54,447 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2019-10-15 03:03:54,447 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:03:54,447 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-15 03:03:54,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-15 03:03:54,448 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-15 03:03:54,448 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-15 03:03:54,448 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:03:54,448 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:03:54,924 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:03:54,925 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-15 03:03:54,926 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:03:54 BoogieIcfgContainer [2019-10-15 03:03:54,926 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:03:54,927 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:03:54,927 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:03:54,931 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:03:54,931 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:03:53" (1/3) ... [2019-10-15 03:03:54,932 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34a6dab0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:03:54, skipping insertion in model container [2019-10-15 03:03:54,932 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:03:54" (2/3) ... [2019-10-15 03:03:54,933 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34a6dab0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:03:54, skipping insertion in model container [2019-10-15 03:03:54,933 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:03:54" (3/3) ... [2019-10-15 03:03:54,935 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-10-15 03:03:54,945 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:03:54,956 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:03:54,968 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:03:55,001 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:03:55,001 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:03:55,002 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:03:55,002 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:03:55,002 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:03:55,002 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:03:55,002 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:03:55,002 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:03:55,018 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-10-15 03:03:55,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-15 03:03:55,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:03:55,025 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:03:55,027 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:03:55,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:03:55,032 INFO L82 PathProgramCache]: Analyzing trace with hash 68001464, now seen corresponding path program 1 times [2019-10-15 03:03:55,041 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:03:55,042 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991478706] [2019-10-15 03:03:55,042 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:55,042 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:55,043 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:03:55,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:03:55,243 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 03:03:55,244 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991478706] [2019-10-15 03:03:55,246 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:03:55,247 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-10-15 03:03:55,247 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395669707] [2019-10-15 03:03:55,254 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-10-15 03:03:55,254 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:03:55,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-10-15 03:03:55,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:03:55,277 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 2 states. [2019-10-15 03:03:55,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:03:55,303 INFO L93 Difference]: Finished difference Result 45 states and 60 transitions. [2019-10-15 03:03:55,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-10-15 03:03:55,305 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2019-10-15 03:03:55,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:03:55,314 INFO L225 Difference]: With dead ends: 45 [2019-10-15 03:03:55,314 INFO L226 Difference]: Without dead ends: 21 [2019-10-15 03:03:55,319 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-10-15 03:03:55,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-15 03:03:55,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-15 03:03:55,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-15 03:03:55,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2019-10-15 03:03:55,364 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 18 [2019-10-15 03:03:55,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:03:55,365 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2019-10-15 03:03:55,365 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-10-15 03:03:55,365 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2019-10-15 03:03:55,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-15 03:03:55,367 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:03:55,367 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 03:03:55,367 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:03:55,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:03:55,368 INFO L82 PathProgramCache]: Analyzing trace with hash 687739182, now seen corresponding path program 1 times [2019-10-15 03:03:55,369 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:03:55,369 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693526331] [2019-10-15 03:03:55,369 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:55,369 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:55,370 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:03:55,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:03:55,436 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 03:03:55,436 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693526331] [2019-10-15 03:03:55,437 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:03:55,437 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-15 03:03:55,441 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1780924089] [2019-10-15 03:03:55,444 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-15 03:03:55,444 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:03:55,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-15 03:03:55,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-15 03:03:55,445 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 3 states. [2019-10-15 03:03:55,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:03:55,500 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2019-10-15 03:03:55,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-15 03:03:55,501 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2019-10-15 03:03:55,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:03:55,505 INFO L225 Difference]: With dead ends: 40 [2019-10-15 03:03:55,505 INFO L226 Difference]: Without dead ends: 25 [2019-10-15 03:03:55,506 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 03:03:55,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-15 03:03:55,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2019-10-15 03:03:55,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-15 03:03:55,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2019-10-15 03:03:55,525 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 20 [2019-10-15 03:03:55,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:03:55,525 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2019-10-15 03:03:55,525 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-15 03:03:55,525 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2019-10-15 03:03:55,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-15 03:03:55,527 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:03:55,527 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, 1, 1] [2019-10-15 03:03:55,528 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:03:55,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:03:55,528 INFO L82 PathProgramCache]: Analyzing trace with hash -316546354, now seen corresponding path program 1 times [2019-10-15 03:03:55,529 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:03:55,529 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31145437] [2019-10-15 03:03:55,530 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:55,530 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:55,530 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:03:55,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:03:55,625 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:03:55,625 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31145437] [2019-10-15 03:03:55,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [549241702] [2019-10-15 03:03:55,626 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 03:03:55,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:03:55,693 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-15 03:03:55,700 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:03:55,731 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:03:55,731 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:03:55,762 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-15 03:03:55,763 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574601619] [2019-10-15 03:03:55,794 INFO L162 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-10-15 03:03:55,795 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:03:55,804 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:03:55,815 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:03:55,816 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:03:56,076 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:03:56,698 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2019-10-15 03:03:56,730 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:03:56,749 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:03:57,603 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:03:57,603 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 18] total 24 [2019-10-15 03:03:57,604 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281930091] [2019-10-15 03:03:57,605 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-15 03:03:57,606 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:03:57,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-15 03:03:57,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2019-10-15 03:03:57,608 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 24 states. [2019-10-15 03:03:58,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:03:58,819 INFO L93 Difference]: Finished difference Result 62 states and 79 transitions. [2019-10-15 03:03:58,820 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-15 03:03:58,820 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 22 [2019-10-15 03:03:58,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:03:58,821 INFO L225 Difference]: With dead ends: 62 [2019-10-15 03:03:58,821 INFO L226 Difference]: Without dead ends: 46 [2019-10-15 03:03:58,822 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 52 SyntacticMatches, 1 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 458 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=246, Invalid=1476, Unknown=0, NotChecked=0, Total=1722 [2019-10-15 03:03:58,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-15 03:03:58,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 36. [2019-10-15 03:03:58,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-15 03:03:58,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2019-10-15 03:03:58,832 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 22 [2019-10-15 03:03:58,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:03:58,832 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2019-10-15 03:03:58,832 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-15 03:03:58,832 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2019-10-15 03:03:58,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2019-10-15 03:03:58,833 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:03:58,834 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:03:59,037 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:03:59,038 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:03:59,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:03:59,039 INFO L82 PathProgramCache]: Analyzing trace with hash -339653586, now seen corresponding path program 2 times [2019-10-15 03:03:59,039 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:03:59,039 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729744767] [2019-10-15 03:03:59,040 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:59,040 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:03:59,040 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:03:59,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:03:59,131 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 03:03:59,132 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729744767] [2019-10-15 03:03:59,132 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844826267] [2019-10-15 03:03:59,132 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 03:03:59,186 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-15 03:03:59,187 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-15 03:03:59,188 INFO L256 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-15 03:03:59,190 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:03:59,206 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 03:03:59,207 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:03:59,236 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-15 03:03:59,236 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1360027730] [2019-10-15 03:03:59,238 INFO L162 IcfgInterpreter]: Started Sifa with 21 locations of interest [2019-10-15 03:03:59,238 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:03:59,239 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:03:59,239 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:03:59,239 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:03:59,265 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 21 for LOIs [2019-10-15 03:03:59,649 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs [2019-10-15 03:03:59,666 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2019-10-15 03:03:59,673 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:00,650 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:04:00,650 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 18] total 25 [2019-10-15 03:04:00,651 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817738185] [2019-10-15 03:04:00,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-15 03:04:00,652 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:00,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-15 03:04:00,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=506, Unknown=0, NotChecked=0, Total=600 [2019-10-15 03:04:00,654 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand 25 states. [2019-10-15 03:04:01,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:01,995 INFO L93 Difference]: Finished difference Result 74 states and 88 transitions. [2019-10-15 03:04:01,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-15 03:04:01,995 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 28 [2019-10-15 03:04:01,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:01,997 INFO L225 Difference]: With dead ends: 74 [2019-10-15 03:04:01,997 INFO L226 Difference]: Without dead ends: 48 [2019-10-15 03:04:01,998 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 497 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=270, Invalid=1622, Unknown=0, NotChecked=0, Total=1892 [2019-10-15 03:04:01,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-15 03:04:02,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 38. [2019-10-15 03:04:02,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-15 03:04:02,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2019-10-15 03:04:02,008 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 28 [2019-10-15 03:04:02,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:02,009 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2019-10-15 03:04:02,009 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-15 03:04:02,009 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2019-10-15 03:04:02,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-10-15 03:04:02,010 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:02,010 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:02,211 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:02,212 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:02,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:02,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1384059442, now seen corresponding path program 3 times [2019-10-15 03:04:02,213 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:02,214 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445549006] [2019-10-15 03:04:02,214 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:02,214 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:02,214 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:02,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-15 03:04:02,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-15 03:04:02,408 INFO L168 tionRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-10-15 03:04:02,409 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-15 03:04:02,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.10 03:04:02 BoogieIcfgContainer [2019-10-15 03:04:02,491 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-15 03:04:02,494 INFO L168 Benchmark]: Toolchain (without parser) took 8591.65 ms. Allocated memory was 136.8 MB in the beginning and 287.3 MB in the end (delta: 150.5 MB). Free memory was 100.6 MB in the beginning and 252.0 MB in the end (delta: -151.3 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-10-15 03:04:02,495 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 136.8 MB. Free memory was 118.9 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2019-10-15 03:04:02,497 INFO L168 Benchmark]: CACSL2BoogieTranslator took 414.36 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 100.4 MB in the beginning and 179.1 MB in the end (delta: -78.7 MB). Peak memory consumption was 23.7 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:02,504 INFO L168 Benchmark]: Boogie Preprocessor took 58.18 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 177.1 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:02,505 INFO L168 Benchmark]: RCFGBuilder took 548.72 ms. Allocated memory is still 200.3 MB. Free memory was 176.5 MB in the beginning and 153.7 MB in the end (delta: 22.8 MB). Peak memory consumption was 22.8 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:02,511 INFO L168 Benchmark]: TraceAbstraction took 7564.76 ms. Allocated memory was 200.3 MB in the beginning and 287.3 MB in the end (delta: 87.0 MB). Free memory was 153.0 MB in the beginning and 252.0 MB in the end (delta: -98.9 MB). There was no memory consumed. Max. memory is 7.1 GB. [2019-10-15 03:04:02,517 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 136.8 MB. Free memory was 118.9 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 414.36 ms. Allocated memory was 136.8 MB in the beginning and 200.3 MB in the end (delta: 63.4 MB). Free memory was 100.4 MB in the beginning and 179.1 MB in the end (delta: -78.7 MB). Peak memory consumption was 23.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 58.18 ms. Allocated memory is still 200.3 MB. Free memory was 179.1 MB in the beginning and 177.1 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 548.72 ms. Allocated memory is still 200.3 MB. Free memory was 176.5 MB in the beginning and 153.7 MB in the end (delta: 22.8 MB). Peak memory consumption was 22.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7564.76 ms. Allocated memory was 200.3 MB in the beginning and 287.3 MB in the end (delta: 87.0 MB). Free memory was 153.0 MB in the beginning and 252.0 MB in the end (delta: -98.9 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 VAL [found=0, i=0, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=1, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=2, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=3, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=4, string_A={1:0}, string_B={-1:0}] [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}] [L21] COND FALSE !(i<5) [L23] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={1:0}, string_A[5 -1]=0, string_B={-1:0}] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 VAL [found=0, i=0, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=1, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=2, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=3, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=4, string_A={1:0}, string_B={-1:0}] [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}] [L25] COND FALSE !(i<5) [L27] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={1:0}, string_B={-1:0}, string_B[5 -1]=0] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={1:0}, string_B={-1:0}] [L30] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={1:0}, string_A[nc_A]=0, string_B={-1:0}] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={1:0}, string_B={-1:0}] [L34] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={1:0}, string_B={-1:0}, string_B[nc_B]=0] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={1:0}, string_B={-1:0}] [L41] COND FALSE !((inc_B-1)<