/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/Problem03_label50.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 16:45:41,345 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 16:45:41,347 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 16:45:41,387 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 16:45:41,388 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 16:45:41,390 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 16:45:41,393 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 16:45:41,395 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 16:45:41,396 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 16:45:41,400 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 16:45:41,401 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 16:45:41,402 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 16:45:41,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 16:45:41,405 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 16:45:41,406 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 16:45:41,407 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 16:45:41,407 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 16:45:41,408 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 16:45:41,410 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 16:45:41,414 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 16:45:41,415 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 16:45:41,416 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 16:45:41,417 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 16:45:41,418 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 16:45:41,425 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 16:45:41,425 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 16:45:41,426 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 16:45:41,427 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 16:45:41,427 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 16:45:41,428 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 16:45:41,428 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 16:45:41,429 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 16:45:41,430 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 16:45:41,430 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 16:45:41,431 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 16:45:41,431 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 16:45:41,432 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 16:45:41,432 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 16:45:41,432 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 16:45:41,432 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 16:45:41,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 16:45:41,434 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 16:45:41,462 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 16:45:41,462 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 16:45:41,463 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 16:45:41,463 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 16:45:41,464 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 16:45:41,464 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 16:45:41,464 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 16:45:41,464 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 16:45:41,464 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 16:45:41,464 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 16:45:41,465 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 16:45:41,465 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 16:45:41,465 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 16:45:41,465 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 16:45:41,466 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 16:45:41,466 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 16:45:41,466 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 16:45:41,466 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 16:45:41,466 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 16:45:41,466 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 16:45:41,467 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 16:45:41,467 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 16:45:41,467 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 16:45:41,467 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 16:45:41,467 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 16:45:41,467 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 16:45:41,468 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 16:45:41,468 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 16:45:41,468 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 16:45:41,468 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 16:45:41,468 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 16:45:41,468 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 16:45:41,469 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 16:45:41,469 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 16:45:41,470 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 16:45:41,470 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 16:45:41,655 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 16:45:41,671 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 16:45:41,673 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 16:45:41,674 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 16:45:41,675 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 16:45:41,676 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem03_label50.c [2023-04-02 16:45:42,828 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 16:45:43,096 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 16:45:43,096 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label50.c [2023-04-02 16:45:43,110 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa1520205/59339bca01844a16baf58d45dd60c70c/FLAG29b905a2b [2023-04-02 16:45:43,123 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fa1520205/59339bca01844a16baf58d45dd60c70c [2023-04-02 16:45:43,125 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 16:45:43,127 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 16:45:43,130 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 16:45:43,130 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 16:45:43,133 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 16:45:43,133 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:43,134 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b833ba7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43, skipping insertion in model container [2023-04-02 16:45:43,135 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:43,140 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 16:45:43,202 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 16:45:43,634 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/Problem03_label50.c[55003,55016] [2023-04-02 16:45:43,671 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 16:45:43,682 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 16:45:43,844 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/Problem03_label50.c[55003,55016] [2023-04-02 16:45:43,860 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 16:45:43,877 INFO L208 MainTranslator]: Completed translation [2023-04-02 16:45:43,877 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43 WrapperNode [2023-04-02 16:45:43,877 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 16:45:43,878 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 16:45:43,878 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 16:45:43,879 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 16:45:43,889 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:43,889 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:43,916 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:43,927 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:43,989 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:44,008 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:44,024 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:44,032 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:44,045 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 16:45:44,046 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 16:45:44,046 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 16:45:44,046 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 16:45:44,048 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (1/1) ... [2023-04-02 16:45:44,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 16:45:44,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:45:44,078 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 16:45:44,087 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 16:45:44,117 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 16:45:44,117 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 16:45:44,117 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 16:45:44,117 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-02 16:45:44,117 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 16:45:44,117 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-02 16:45:44,118 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 16:45:44,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 16:45:44,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 16:45:44,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 16:45:44,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 16:45:44,149 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 16:45:44,150 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 16:45:44,271 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 16:45:44,273 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 16:45:45,710 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 16:45:46,009 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 16:45:46,009 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 16:45:46,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 04:45:46 BoogieIcfgContainer [2023-04-02 16:45:46,012 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 16:45:46,014 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 16:45:46,014 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 16:45:46,017 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 16:45:46,017 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 04:45:43" (1/3) ... [2023-04-02 16:45:46,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34eff1fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 04:45:46, skipping insertion in model container [2023-04-02 16:45:46,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:45:43" (2/3) ... [2023-04-02 16:45:46,018 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34eff1fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 04:45:46, skipping insertion in model container [2023-04-02 16:45:46,018 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 04:45:46" (3/3) ... [2023-04-02 16:45:46,019 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label50.c [2023-04-02 16:45:46,035 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 16:45:46,036 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 16:45:46,077 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 16:45:46,083 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;@7b4fa9f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 16:45:46,083 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 16:45:46,088 INFO L276 IsEmpty]: Start isEmpty. Operand has 158 states, 150 states have (on average 1.9466666666666668) internal successors, (292), 151 states have internal predecessors, (292), 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 16:45:46,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-04-02 16:45:46,100 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:45:46,101 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, 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 16:45:46,101 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:45:46,106 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:45:46,106 INFO L85 PathProgramCache]: Analyzing trace with hash 597483139, now seen corresponding path program 1 times [2023-04-02 16:45:46,114 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:45:46,114 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892168749] [2023-04-02 16:45:46,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:46,115 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:45:46,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:47,006 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 16:45:47,006 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:45:47,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892168749] [2023-04-02 16:45:47,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892168749] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:45:47,008 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:45:47,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 16:45:47,009 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586486106] [2023-04-02 16:45:47,010 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:45:47,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 16:45:47,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:45:47,051 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 16:45:47,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 16:45:47,056 INFO L87 Difference]: Start difference. First operand has 158 states, 150 states have (on average 1.9466666666666668) internal successors, (292), 151 states have internal predecessors, (292), 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 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 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 16:45:47,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:45:47,780 INFO L93 Difference]: Finished difference Result 462 states and 886 transitions. [2023-04-02 16:45:47,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 16:45:47,783 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 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 149 [2023-04-02 16:45:47,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:45:47,794 INFO L225 Difference]: With dead ends: 462 [2023-04-02 16:45:47,794 INFO L226 Difference]: Without dead ends: 301 [2023-04-02 16:45:47,797 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 16:45:47,800 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 30 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 624 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-02 16:45:47,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 45 Invalid, 624 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-02 16:45:47,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2023-04-02 16:45:47,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2023-04-02 16:45:47,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 293 states have (on average 1.8907849829351535) internal successors, (554), 293 states have internal predecessors, (554), 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 16:45:47,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 563 transitions. [2023-04-02 16:45:47,851 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 563 transitions. Word has length 149 [2023-04-02 16:45:47,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:45:47,852 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 563 transitions. [2023-04-02 16:45:47,853 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 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 16:45:47,853 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 563 transitions. [2023-04-02 16:45:47,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-04-02 16:45:47,856 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:45:47,856 INFO L195 NwaCegarLoop]: trace histogram [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, 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 16:45:47,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 16:45:47,857 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:45:47,857 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:45:47,857 INFO L85 PathProgramCache]: Analyzing trace with hash 15657789, now seen corresponding path program 1 times [2023-04-02 16:45:47,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:45:47,858 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [694922639] [2023-04-02 16:45:47,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:47,858 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:45:47,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:48,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:45:48,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:45:48,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [694922639] [2023-04-02 16:45:48,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [694922639] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:45:48,360 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:45:48,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:45:48,360 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167203116] [2023-04-02 16:45:48,360 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:45:48,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:45:48,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:45:48,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:45:48,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:45:48,363 INFO L87 Difference]: Start difference. First operand 301 states and 563 transitions. Second operand has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 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 16:45:48,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:45:48,815 INFO L93 Difference]: Finished difference Result 911 states and 1722 transitions. [2023-04-02 16:45:48,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 16:45:48,816 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 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 158 [2023-04-02 16:45:48,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:45:48,820 INFO L225 Difference]: With dead ends: 911 [2023-04-02 16:45:48,821 INFO L226 Difference]: Without dead ends: 615 [2023-04-02 16:45:48,822 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-04-02 16:45:48,823 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 773 mSDsluCounter, 348 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 773 SdHoareTripleChecker+Valid, 529 SdHoareTripleChecker+Invalid, 438 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 16:45:48,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [773 Valid, 529 Invalid, 438 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 16:45:48,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2023-04-02 16:45:48,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 603. [2023-04-02 16:45:48,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 587 states have (on average 1.879045996592845) internal successors, (1103), 591 states have internal predecessors, (1103), 6 states have call successors, (6), 6 states have call predecessors, (6), 9 states have return successors, (25), 5 states have call predecessors, (25), 5 states have call successors, (25) [2023-04-02 16:45:48,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 1134 transitions. [2023-04-02 16:45:48,860 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 1134 transitions. Word has length 158 [2023-04-02 16:45:48,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:45:48,860 INFO L495 AbstractCegarLoop]: Abstraction has 603 states and 1134 transitions. [2023-04-02 16:45:48,861 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 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 16:45:48,861 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 1134 transitions. [2023-04-02 16:45:48,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-04-02 16:45:48,864 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:45:48,864 INFO L195 NwaCegarLoop]: trace histogram [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, 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 16:45:48,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 16:45:48,865 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:45:48,865 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:45:48,865 INFO L85 PathProgramCache]: Analyzing trace with hash 1985048025, now seen corresponding path program 1 times [2023-04-02 16:45:48,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:45:48,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [424620549] [2023-04-02 16:45:48,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:48,866 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:45:48,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:49,732 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:45:49,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:45:49,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [424620549] [2023-04-02 16:45:49,733 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [424620549] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 16:45:49,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537665320] [2023-04-02 16:45:49,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:49,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:45:49,734 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:45:49,737 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 16:45:49,747 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 16:45:50,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:50,054 INFO L262 TraceCheckSpWp]: Trace formula consists of 850 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-02 16:45:50,069 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 16:45:50,315 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 16:45:50,315 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 16:45:50,599 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-02 16:45:50,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537665320] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-02 16:45:50,600 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-02 16:45:50,600 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 9 [2023-04-02 16:45:50,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037163844] [2023-04-02 16:45:50,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:45:50,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-02 16:45:50,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:45:50,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-02 16:45:50,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-04-02 16:45:50,602 INFO L87 Difference]: Start difference. First operand 603 states and 1134 transitions. Second operand has 4 states, 4 states have (on average 38.0) internal successors, (152), 3 states have internal predecessors, (152), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:45:51,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:45:51,191 INFO L93 Difference]: Finished difference Result 1811 states and 3471 transitions. [2023-04-02 16:45:51,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-02 16:45:51,192 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 38.0) internal successors, (152), 3 states have internal predecessors, (152), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 160 [2023-04-02 16:45:51,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:45:51,202 INFO L225 Difference]: With dead ends: 1811 [2023-04-02 16:45:51,202 INFO L226 Difference]: Without dead ends: 1213 [2023-04-02 16:45:51,204 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 316 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2023-04-02 16:45:51,205 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 271 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 667 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-04-02 16:45:51,205 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [271 Valid, 22 Invalid, 667 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-04-02 16:45:51,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2023-04-02 16:45:51,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1213. [2023-04-02 16:45:51,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1213 states, 1178 states have (on average 1.7419354838709677) internal successors, (2052), 1193 states have internal predecessors, (2052), 10 states have call successors, (10), 10 states have call predecessors, (10), 24 states have return successors, (103), 9 states have call predecessors, (103), 9 states have call successors, (103) [2023-04-02 16:45:51,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1213 states to 1213 states and 2165 transitions. [2023-04-02 16:45:51,244 INFO L78 Accepts]: Start accepts. Automaton has 1213 states and 2165 transitions. Word has length 160 [2023-04-02 16:45:51,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:45:51,244 INFO L495 AbstractCegarLoop]: Abstraction has 1213 states and 2165 transitions. [2023-04-02 16:45:51,244 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 38.0) internal successors, (152), 3 states have internal predecessors, (152), 2 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 16:45:51,245 INFO L276 IsEmpty]: Start isEmpty. Operand 1213 states and 2165 transitions. [2023-04-02 16:45:51,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2023-04-02 16:45:51,249 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:45:51,249 INFO L195 NwaCegarLoop]: trace histogram [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, 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 16:45:51,257 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 16:45:51,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:45:51,455 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:45:51,455 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:45:51,455 INFO L85 PathProgramCache]: Analyzing trace with hash -1859000915, now seen corresponding path program 1 times [2023-04-02 16:45:51,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:45:51,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13961720] [2023-04-02 16:45:51,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:51,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:45:51,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:51,869 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:45:51,869 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:45:51,869 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13961720] [2023-04-02 16:45:51,869 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [13961720] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:45:51,870 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:45:51,870 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:45:51,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1880828508] [2023-04-02 16:45:51,872 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:45:51,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:45:51,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:45:51,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:45:51,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:45:51,874 INFO L87 Difference]: Start difference. First operand 1213 states and 2165 transitions. Second operand has 5 states, 5 states have (on average 32.0) internal successors, (160), 4 states have internal predecessors, (160), 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 16:45:52,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:45:52,311 INFO L93 Difference]: Finished difference Result 2417 states and 4361 transitions. [2023-04-02 16:45:52,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-04-02 16:45:52,315 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 32.0) internal successors, (160), 4 states have internal predecessors, (160), 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 166 [2023-04-02 16:45:52,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:45:52,320 INFO L225 Difference]: With dead ends: 2417 [2023-04-02 16:45:52,322 INFO L226 Difference]: Without dead ends: 1209 [2023-04-02 16:45:52,325 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-04-02 16:45:52,329 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 511 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 537 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 511 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 537 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 16:45:52,330 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [511 Valid, 20 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 537 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 16:45:52,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1209 states. [2023-04-02 16:45:52,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1209 to 1209. [2023-04-02 16:45:52,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1209 states, 1176 states have (on average 1.6581632653061225) internal successors, (1950), 1189 states have internal predecessors, (1950), 10 states have call successors, (10), 10 states have call predecessors, (10), 22 states have return successors, (83), 9 states have call predecessors, (83), 9 states have call successors, (83) [2023-04-02 16:45:52,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1209 states to 1209 states and 2043 transitions. [2023-04-02 16:45:52,370 INFO L78 Accepts]: Start accepts. Automaton has 1209 states and 2043 transitions. Word has length 166 [2023-04-02 16:45:52,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:45:52,370 INFO L495 AbstractCegarLoop]: Abstraction has 1209 states and 2043 transitions. [2023-04-02 16:45:52,370 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 32.0) internal successors, (160), 4 states have internal predecessors, (160), 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 16:45:52,370 INFO L276 IsEmpty]: Start isEmpty. Operand 1209 states and 2043 transitions. [2023-04-02 16:45:52,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2023-04-02 16:45:52,373 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:45:52,374 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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, 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 16:45:52,374 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-02 16:45:52,374 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:45:52,375 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:45:52,376 INFO L85 PathProgramCache]: Analyzing trace with hash -45422425, now seen corresponding path program 1 times [2023-04-02 16:45:52,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:45:52,377 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [78755003] [2023-04-02 16:45:52,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:52,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:45:52,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:52,833 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 18 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 16:45:52,834 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:45:52,834 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [78755003] [2023-04-02 16:45:52,834 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [78755003] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 16:45:52,834 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493480663] [2023-04-02 16:45:52,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:52,834 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:45:52,835 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:45:52,836 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 16:45:52,838 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 16:45:53,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:53,065 INFO L262 TraceCheckSpWp]: Trace formula consists of 1021 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 16:45:53,069 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 16:45:53,117 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-02 16:45:53,117 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 16:45:53,117 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493480663] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:45:53,117 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 16:45:53,118 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-04-02 16:45:53,118 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652565612] [2023-04-02 16:45:53,118 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:45:53,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:45:53,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:45:53,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:45:53,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-04-02 16:45:53,119 INFO L87 Difference]: Start difference. First operand 1209 states and 2043 transitions. Second operand has 5 states, 5 states have (on average 31.6) internal successors, (158), 4 states have internal predecessors, (158), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 16:45:53,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:45:53,811 INFO L93 Difference]: Finished difference Result 3703 states and 6672 transitions. [2023-04-02 16:45:53,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 16:45:53,812 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 31.6) internal successors, (158), 4 states have internal predecessors, (158), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 173 [2023-04-02 16:45:53,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:45:53,828 INFO L225 Difference]: With dead ends: 3703 [2023-04-02 16:45:53,828 INFO L226 Difference]: Without dead ends: 2499 [2023-04-02 16:45:53,831 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-04-02 16:45:53,832 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 546 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 768 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 546 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-02 16:45:53,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [546 Valid, 35 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 768 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-02 16:45:53,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2499 states. [2023-04-02 16:45:53,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2499 to 2447. [2023-04-02 16:45:53,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2447 states, 2367 states have (on average 1.5602027883396705) internal successors, (3693), 2411 states have internal predecessors, (3693), 18 states have call successors, (18), 18 states have call predecessors, (18), 61 states have return successors, (349), 17 states have call predecessors, (349), 17 states have call successors, (349) [2023-04-02 16:45:53,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2447 states to 2447 states and 4060 transitions. [2023-04-02 16:45:53,911 INFO L78 Accepts]: Start accepts. Automaton has 2447 states and 4060 transitions. Word has length 173 [2023-04-02 16:45:53,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:45:53,911 INFO L495 AbstractCegarLoop]: Abstraction has 2447 states and 4060 transitions. [2023-04-02 16:45:53,912 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 31.6) internal successors, (158), 4 states have internal predecessors, (158), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-02 16:45:53,912 INFO L276 IsEmpty]: Start isEmpty. Operand 2447 states and 4060 transitions. [2023-04-02 16:45:53,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2023-04-02 16:45:53,918 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:45:53,918 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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, 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 16:45:53,930 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 16:45:54,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:45:54,131 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:45:54,131 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:45:54,131 INFO L85 PathProgramCache]: Analyzing trace with hash 1672542014, now seen corresponding path program 1 times [2023-04-02 16:45:54,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:45:54,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285071956] [2023-04-02 16:45:54,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:54,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:45:54,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:55,047 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 19 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 16:45:55,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:45:55,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285071956] [2023-04-02 16:45:55,048 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285071956] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 16:45:55,048 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161441054] [2023-04-02 16:45:55,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:45:55,048 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:45:55,048 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:45:55,049 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 16:45:55,080 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 16:45:55,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:45:55,292 INFO L262 TraceCheckSpWp]: Trace formula consists of 1016 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 16:45:55,296 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 16:45:55,338 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 28 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:45:55,338 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 16:45:55,408 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 28 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:45:55,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161441054] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 16:45:55,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [766549783] [2023-04-02 16:45:55,432 INFO L159 IcfgInterpreter]: Started Sifa with 153 locations of interest [2023-04-02 16:45:55,432 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 16:45:55,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 16:45:55,439 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 16:45:55,440 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 16:45:56,276 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 162 for LOIs [2023-04-02 16:46:05,513 WARN L223 SmtUtils]: Spent 7.96s on a formula simplification that was a NOOP. DAG size: 962 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-04-02 16:46:50,075 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 24864 conjuctions. This might take some time... [2023-04-02 16:47:35,931 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 24864 conjuctions.