/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf -tc ../../../trunk/examples/toolchains/AutomizerC.xml --sifa.abstract.domain OctagonDomain -i ../sv-benchmarks/c/eca-rers2012/Problem02_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 16:15:17,124 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 16:15:17,126 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 16:15:17,165 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 16:15:17,166 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 16:15:17,168 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 16:15:17,171 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 16:15:17,173 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 16:15:17,175 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 16:15:17,179 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 16:15:17,180 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 16:15:17,181 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 16:15:17,182 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 16:15:17,184 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 16:15:17,185 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 16:15:17,186 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 16:15:17,186 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 16:15:17,187 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 16:15:17,189 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 16:15:17,194 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 16:15:17,195 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 16:15:17,196 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 16:15:17,196 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 16:15:17,198 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 16:15:17,205 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 16:15:17,205 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 16:15:17,205 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 16:15:17,207 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 16:15:17,207 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 16:15:17,208 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 16:15:17,208 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 16:15:17,208 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 16:15:17,210 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 16:15:17,210 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 16:15:17,211 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 16:15:17,211 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 16:15:17,211 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 16:15:17,212 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 16:15:17,212 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 16:15:17,212 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 16:15:17,213 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 16:15:17,214 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 16:15:17,248 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 16:15:17,248 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 16:15:17,249 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 16:15:17,249 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 16:15:17,250 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 16:15:17,250 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 16:15:17,250 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 16:15:17,250 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 16:15:17,250 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 16:15:17,250 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 16:15:17,251 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 16:15:17,251 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 16:15:17,251 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 16:15:17,251 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 16:15:17,251 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 16:15:17,252 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 16:15:17,252 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 16:15:17,252 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 16:15:17,252 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 16:15:17,252 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 16:15:17,252 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 16:15:17,253 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 16:15:17,253 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 16:15:17,254 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 16:15:17,254 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 16:15:17,254 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 16:15:17,255 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 16:15:17,255 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 16:15:17,255 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 16:15:17,255 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 16:15:17,255 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 16:15:17,255 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 16:15:17,255 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 16:15:17,256 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 16:15:17,256 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 16:15:17,436 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 16:15:17,464 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 16:15:17,466 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 16:15:17,467 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 16:15:17,468 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 16:15:17,469 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem02_label16.c [2023-04-02 16:15:18,663 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 16:15:18,910 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 16:15:18,911 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem02_label16.c [2023-04-02 16:15:18,921 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc97865d1/0a1a6f36ced94f3f9e2bbe38dc275417/FLAG5bd4ca018 [2023-04-02 16:15:18,939 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc97865d1/0a1a6f36ced94f3f9e2bbe38dc275417 [2023-04-02 16:15:18,941 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 16:15:18,942 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 16:15:18,943 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 16:15:18,944 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 16:15:18,949 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 16:15:18,949 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 04:15:18" (1/1) ... [2023-04-02 16:15:18,950 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b2b0a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:18, skipping insertion in model container [2023-04-02 16:15:18,950 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 04:15:18" (1/1) ... [2023-04-02 16:15:18,956 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 16:15:18,991 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 16:15:19,212 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem02_label16.c[15312,15325] [2023-04-02 16:15:19,268 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 16:15:19,280 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 16:15:19,392 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem02_label16.c[15312,15325] [2023-04-02 16:15:19,406 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 16:15:19,419 INFO L208 MainTranslator]: Completed translation [2023-04-02 16:15:19,420 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19 WrapperNode [2023-04-02 16:15:19,420 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 16:15:19,421 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 16:15:19,421 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 16:15:19,421 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 16:15:19,431 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,431 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,452 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,452 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,488 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,509 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,515 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,518 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,542 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 16:15:19,543 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 16:15:19,543 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 16:15:19,543 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 16:15:19,544 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (1/1) ... [2023-04-02 16:15:19,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 16:15:19,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:15:19,586 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 16:15:19,603 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 16:15:19,623 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 16:15:19,623 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 16:15:19,623 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 16:15:19,625 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-02 16:15:19,625 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 16:15:19,625 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-02 16:15:19,625 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 16:15:19,626 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 16:15:19,627 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 16:15:19,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 16:15:19,627 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 16:15:19,627 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 16:15:19,627 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 16:15:19,725 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 16:15:19,727 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 16:15:20,525 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 16:15:20,768 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 16:15:20,768 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 16:15:20,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 04:15:20 BoogieIcfgContainer [2023-04-02 16:15:20,771 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 16:15:20,773 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 16:15:20,773 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 16:15:20,776 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 16:15:20,776 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 04:15:18" (1/3) ... [2023-04-02 16:15:20,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f116bdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 04:15:20, skipping insertion in model container [2023-04-02 16:15:20,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:15:19" (2/3) ... [2023-04-02 16:15:20,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f116bdf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 04:15:20, skipping insertion in model container [2023-04-02 16:15:20,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 04:15:20" (3/3) ... [2023-04-02 16:15:20,778 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem02_label16.c [2023-04-02 16:15:20,793 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 16:15:20,794 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 16:15:20,834 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 16:15:20,840 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@1e5bcc6e, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 16:15:20,840 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 16:15:20,844 INFO L276 IsEmpty]: Start isEmpty. Operand has 95 states, 87 states have (on average 1.9080459770114941) internal successors, (166), 88 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 16:15:20,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-04-02 16:15:20,852 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:15:20,852 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 16:15:20,853 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:15:20,856 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:15:20,856 INFO L85 PathProgramCache]: Analyzing trace with hash -2027415336, now seen corresponding path program 1 times [2023-04-02 16:15:20,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:15:20,863 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292178440] [2023-04-02 16:15:20,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:15:20,863 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:15:20,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:15:21,389 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:15:21,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:15:21,390 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292178440] [2023-04-02 16:15:21,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292178440] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:15:21,391 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:15:21,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 16:15:21,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213080701] [2023-04-02 16:15:21,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:15:21,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 16:15:21,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:15:21,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 16:15:21,444 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 16:15:21,446 INFO L87 Difference]: Start difference. First operand has 95 states, 87 states have (on average 1.9080459770114941) internal successors, (166), 88 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 16:15:21,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:15:21,882 INFO L93 Difference]: Finished difference Result 273 states and 508 transitions. [2023-04-02 16:15:21,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 16:15:21,884 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2023-04-02 16:15:21,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:15:21,898 INFO L225 Difference]: With dead ends: 273 [2023-04-02 16:15:21,898 INFO L226 Difference]: Without dead ends: 175 [2023-04-02 16:15:21,902 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 16:15:21,908 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 63 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 16:15:21,909 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 30 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 16:15:21,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2023-04-02 16:15:21,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2023-04-02 16:15:21,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 167 states have (on average 1.904191616766467) internal successors, (318), 167 states have internal predecessors, (318), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-02 16:15:21,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 327 transitions. [2023-04-02 16:15:21,976 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 327 transitions. Word has length 86 [2023-04-02 16:15:21,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:15:21,977 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 327 transitions. [2023-04-02 16:15:21,978 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-02 16:15:21,978 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 327 transitions. [2023-04-02 16:15:21,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-04-02 16:15:21,987 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:15:21,988 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 16:15:21,989 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 16:15:21,989 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:15:21,990 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:15:21,990 INFO L85 PathProgramCache]: Analyzing trace with hash -38925826, now seen corresponding path program 1 times [2023-04-02 16:15:21,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:15:21,990 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [379248608] [2023-04-02 16:15:21,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:15:21,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:15:22,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:15:22,325 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:15:22,325 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:15:22,325 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [379248608] [2023-04-02 16:15:22,325 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [379248608] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:15:22,326 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:15:22,326 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:15:22,326 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583800623] [2023-04-02 16:15:22,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:15:22,327 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:15:22,328 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:15:22,328 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:15:22,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:15:22,329 INFO L87 Difference]: Start difference. First operand 175 states and 327 transitions. Second operand has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:15:22,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:15:22,768 INFO L93 Difference]: Finished difference Result 529 states and 1003 transitions. [2023-04-02 16:15:22,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 16:15:22,769 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 101 [2023-04-02 16:15:22,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:15:22,778 INFO L225 Difference]: With dead ends: 529 [2023-04-02 16:15:22,778 INFO L226 Difference]: Without dead ends: 359 [2023-04-02 16:15:22,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-04-02 16:15:22,786 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 363 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 478 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 363 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 527 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 478 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 16:15:22,786 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [363 Valid, 48 Invalid, 527 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 478 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 16:15:22,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 359 states. [2023-04-02 16:15:22,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 359 to 267. [2023-04-02 16:15:22,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 253 states have (on average 1.8339920948616601) internal successors, (464), 257 states have internal predecessors, (464), 5 states have call successors, (5), 5 states have call predecessors, (5), 8 states have return successors, (15), 4 states have call predecessors, (15), 4 states have call successors, (15) [2023-04-02 16:15:22,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 484 transitions. [2023-04-02 16:15:22,812 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 484 transitions. Word has length 101 [2023-04-02 16:15:22,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:15:22,812 INFO L495 AbstractCegarLoop]: Abstraction has 267 states and 484 transitions. [2023-04-02 16:15:22,813 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:15:22,813 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 484 transitions. [2023-04-02 16:15:22,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2023-04-02 16:15:22,816 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:15:22,816 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 16:15:22,817 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 16:15:22,817 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:15:22,817 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:15:22,817 INFO L85 PathProgramCache]: Analyzing trace with hash 1319284103, now seen corresponding path program 1 times [2023-04-02 16:15:22,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:15:22,818 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1092391684] [2023-04-02 16:15:22,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:15:22,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:15:22,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:15:23,073 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:15:23,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:15:23,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1092391684] [2023-04-02 16:15:23,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1092391684] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:15:23,074 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:15:23,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:15:23,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829419574] [2023-04-02 16:15:23,074 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:15:23,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:15:23,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:15:23,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:15:23,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:15:23,076 INFO L87 Difference]: Start difference. First operand 267 states and 484 transitions. Second operand has 5 states, 5 states have (on average 20.4) internal successors, (102), 4 states have internal predecessors, (102), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:15:23,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:15:23,441 INFO L93 Difference]: Finished difference Result 833 states and 1554 transitions. [2023-04-02 16:15:23,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 16:15:23,442 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 20.4) internal successors, (102), 4 states have internal predecessors, (102), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 108 [2023-04-02 16:15:23,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:15:23,448 INFO L225 Difference]: With dead ends: 833 [2023-04-02 16:15:23,448 INFO L226 Difference]: Without dead ends: 571 [2023-04-02 16:15:23,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-04-02 16:15:23,455 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 273 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 563 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-02 16:15:23,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 108 Invalid, 563 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-02 16:15:23,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2023-04-02 16:15:23,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 545. [2023-04-02 16:15:23,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 512 states have (on average 1.736328125) internal successors, (889), 529 states have internal predecessors, (889), 8 states have call successors, (8), 8 states have call predecessors, (8), 24 states have return successors, (59), 7 states have call predecessors, (59), 7 states have call successors, (59) [2023-04-02 16:15:23,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 956 transitions. [2023-04-02 16:15:23,508 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 956 transitions. Word has length 108 [2023-04-02 16:15:23,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:15:23,510 INFO L495 AbstractCegarLoop]: Abstraction has 545 states and 956 transitions. [2023-04-02 16:15:23,510 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 20.4) internal successors, (102), 4 states have internal predecessors, (102), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:15:23,510 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 956 transitions. [2023-04-02 16:15:23,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2023-04-02 16:15:23,517 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:15:23,517 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 16:15:23,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-02 16:15:23,517 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:15:23,520 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:15:23,520 INFO L85 PathProgramCache]: Analyzing trace with hash -1634241265, now seen corresponding path program 1 times [2023-04-02 16:15:23,521 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:15:23,522 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134442485] [2023-04-02 16:15:23,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:15:23,522 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:15:23,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:15:23,756 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:15:23,756 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:15:23,757 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134442485] [2023-04-02 16:15:23,757 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134442485] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:15:23,758 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:15:23,758 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:15:23,759 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907324798] [2023-04-02 16:15:23,759 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:15:23,759 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:15:23,759 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:15:23,760 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:15:23,760 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:15:23,760 INFO L87 Difference]: Start difference. First operand 545 states and 956 transitions. Second operand has 5 states, 5 states have (on average 21.2) internal successors, (106), 4 states have internal predecessors, (106), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:15:24,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:15:24,185 INFO L93 Difference]: Finished difference Result 1673 states and 3157 transitions. [2023-04-02 16:15:24,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 16:15:24,186 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 4 states have internal predecessors, (106), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 112 [2023-04-02 16:15:24,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:15:24,193 INFO L225 Difference]: With dead ends: 1673 [2023-04-02 16:15:24,193 INFO L226 Difference]: Without dead ends: 1133 [2023-04-02 16:15:24,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-04-02 16:15:24,196 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 330 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 124 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 330 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 543 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 124 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 16:15:24,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [330 Valid, 42 Invalid, 543 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [124 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 16:15:24,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1133 states. [2023-04-02 16:15:24,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1133 to 1105. [2023-04-02 16:15:24,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1105 states, 1032 states have (on average 1.5978682170542635) internal successors, (1649), 1077 states have internal predecessors, (1649), 14 states have call successors, (14), 14 states have call predecessors, (14), 58 states have return successors, (221), 13 states have call predecessors, (221), 13 states have call successors, (221) [2023-04-02 16:15:24,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1105 states to 1105 states and 1884 transitions. [2023-04-02 16:15:24,269 INFO L78 Accepts]: Start accepts. Automaton has 1105 states and 1884 transitions. Word has length 112 [2023-04-02 16:15:24,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:15:24,269 INFO L495 AbstractCegarLoop]: Abstraction has 1105 states and 1884 transitions. [2023-04-02 16:15:24,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 21.2) internal successors, (106), 4 states have internal predecessors, (106), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:15:24,270 INFO L276 IsEmpty]: Start isEmpty. Operand 1105 states and 1884 transitions. [2023-04-02 16:15:24,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-04-02 16:15:24,274 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:15:24,274 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 16:15:24,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-02 16:15:24,274 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:15:24,275 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:15:24,275 INFO L85 PathProgramCache]: Analyzing trace with hash -1388567469, now seen corresponding path program 1 times [2023-04-02 16:15:24,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:15:24,275 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135530333] [2023-04-02 16:15:24,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:15:24,276 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:15:24,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:15:24,848 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 24 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 16:15:24,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:15:24,849 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135530333] [2023-04-02 16:15:24,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135530333] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 16:15:24,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966797845] [2023-04-02 16:15:24,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:15:24,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:15:24,851 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:15:24,857 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 16:15:24,875 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 16:15:24,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:15:24,972 INFO L262 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 16:15:24,980 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 16:15:25,119 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:15:25,119 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 16:15:25,272 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:15:25,273 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966797845] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 16:15:25,273 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1281420953] [2023-04-02 16:15:25,294 INFO L159 IcfgInterpreter]: Started Sifa with 90 locations of interest [2023-04-02 16:15:25,294 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 16:15:25,303 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 16:15:25,307 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 16:15:25,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 16:15:25,618 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 65 for LOIs [2023-04-02 16:15:31,726 WARN L223 SmtUtils]: Spent 5.53s on a formula simplification. DAG size of input: 488 DAG size of output: 489 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-04-02 16:17:26,511 WARN L223 SmtUtils]: Spent 1.72m on a formula simplification that was a NOOP. DAG size: 2920 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm)