/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 EqDomain -i ../sv-benchmarks/c/eca-rers2012/Problem03_label54.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 09:27:17,348 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 09:27:17,349 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 09:27:17,383 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 09:27:17,383 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 09:27:17,384 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 09:27:17,392 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 09:27:17,395 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 09:27:17,396 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 09:27:17,401 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 09:27:17,402 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 09:27:17,403 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 09:27:17,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 09:27:17,407 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 09:27:17,408 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 09:27:17,409 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 09:27:17,410 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 09:27:17,410 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 09:27:17,412 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 09:27:17,416 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 09:27:17,417 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 09:27:17,418 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 09:27:17,419 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 09:27:17,420 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 09:27:17,428 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 09:27:17,428 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 09:27:17,428 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 09:27:17,430 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 09:27:17,430 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 09:27:17,430 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 09:27:17,431 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 09:27:17,431 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 09:27:17,432 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 09:27:17,433 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 09:27:17,434 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 09:27:17,434 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 09:27:17,434 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 09:27:17,435 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 09:27:17,435 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 09:27:17,435 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 09:27:17,436 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 09:27:17,437 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 [2023-04-01 09:27:17,467 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 09:27:17,467 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 09:27:17,467 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 09:27:17,467 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 09:27:17,468 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 09:27:17,468 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 09:27:17,468 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 09:27:17,469 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 09:27:17,469 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 09:27:17,469 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 09:27:17,469 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 09:27:17,470 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 09:27:17,470 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 09:27:17,470 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 09:27:17,470 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 09:27:17,470 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 09:27:17,470 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 09:27:17,470 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 09:27:17,471 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 09:27:17,471 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 09:27:17,471 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 09:27:17,472 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 09:27:17,472 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 09:27:17,472 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 09:27:17,472 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 09:27:17,472 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 09:27:17,472 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 09:27:17,473 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 09:27:17,473 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 09:27:17,473 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 09:27:17,473 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 09:27:17,473 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 09:27:17,473 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:27:17,473 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 09:27:17,474 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 09:27:17,474 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 09:27:17,704 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 09:27:17,730 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 09:27:17,732 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 09:27:17,733 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 09:27:17,733 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 09:27:17,734 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem03_label54.c [2023-04-01 09:27:18,848 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 09:27:19,170 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 09:27:19,170 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label54.c [2023-04-01 09:27:19,185 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15cd5d773/e81aba3f53c3407fb8b673925b56fd52/FLAG12c4a8afd [2023-04-01 09:27:19,203 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/15cd5d773/e81aba3f53c3407fb8b673925b56fd52 [2023-04-01 09:27:19,205 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 09:27:19,206 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 09:27:19,209 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 09:27:19,209 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 09:27:19,212 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 09:27:19,212 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:19,213 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27e61e1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19, skipping insertion in model container [2023-04-01 09:27:19,214 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:19,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 09:27:19,283 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 09:27:19,698 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_label54.c[56627,56640] [2023-04-01 09:27:19,731 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:27:19,741 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 09:27:19,907 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_label54.c[56627,56640] [2023-04-01 09:27:19,920 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:27:19,935 INFO L208 MainTranslator]: Completed translation [2023-04-01 09:27:19,936 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19 WrapperNode [2023-04-01 09:27:19,936 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 09:27:19,937 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 09:27:19,937 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 09:27:19,937 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 09:27:19,947 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:19,947 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:19,993 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:19,993 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:20,050 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:20,059 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:20,072 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:20,079 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:20,092 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 09:27:20,093 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 09:27:20,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 09:27:20,094 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 09:27:20,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (1/1) ... [2023-04-01 09:27:20,102 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:27:20,112 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:27:20,125 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) [2023-04-01 09:27:20,149 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 [2023-04-01 09:27:20,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 09:27:20,165 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 09:27:20,166 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 09:27:20,166 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-01 09:27:20,166 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 09:27:20,166 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 09:27:20,167 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 09:27:20,277 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 09:27:20,278 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 09:27:21,801 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 09:27:22,060 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 09:27:22,060 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 09:27:22,064 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:27:22 BoogieIcfgContainer [2023-04-01 09:27:22,064 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 09:27:22,067 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 09:27:22,067 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 09:27:22,069 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 09:27:22,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 09:27:19" (1/3) ... [2023-04-01 09:27:22,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bd53e67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:27:22, skipping insertion in model container [2023-04-01 09:27:22,070 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:27:19" (2/3) ... [2023-04-01 09:27:22,070 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2bd53e67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:27:22, skipping insertion in model container [2023-04-01 09:27:22,071 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:27:22" (3/3) ... [2023-04-01 09:27:22,071 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label54.c [2023-04-01 09:27:22,087 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 09:27:22,087 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 09:27:22,137 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 09:27:22,143 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;@18086c85, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 09:27:22,144 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 09:27:22,149 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) [2023-04-01 09:27:22,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-04-01 09:27:22,166 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:27:22,166 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] [2023-04-01 09:27:22,167 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:27:22,172 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:27:22,173 INFO L85 PathProgramCache]: Analyzing trace with hash 597532339, now seen corresponding path program 1 times [2023-04-01 09:27:22,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:27:22,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589860416] [2023-04-01 09:27:22,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:22,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:27:22,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:23,151 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:27:23,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:27:23,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589860416] [2023-04-01 09:27:23,152 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589860416] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:27:23,153 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:27:23,153 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 09:27:23,154 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296733189] [2023-04-01 09:27:23,155 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:27:23,160 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 09:27:23,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:27:23,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 09:27:23,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 09:27:23,202 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) [2023-04-01 09:27:24,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:27:24,018 INFO L93 Difference]: Finished difference Result 462 states and 886 transitions. [2023-04-01 09:27:24,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 09:27:24,020 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 [2023-04-01 09:27:24,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:27:24,031 INFO L225 Difference]: With dead ends: 462 [2023-04-01 09:27:24,031 INFO L226 Difference]: Without dead ends: 301 [2023-04-01 09:27:24,034 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 [2023-04-01 09:27:24,037 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 30 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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 [2023-04-01 09:27:24,037 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] [2023-04-01 09:27:24,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2023-04-01 09:27:24,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2023-04-01 09:27:24,089 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) [2023-04-01 09:27:24,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 563 transitions. [2023-04-01 09:27:24,091 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 563 transitions. Word has length 149 [2023-04-01 09:27:24,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:27:24,092 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 563 transitions. [2023-04-01 09:27:24,092 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) [2023-04-01 09:27:24,092 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 563 transitions. [2023-04-01 09:27:24,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-04-01 09:27:24,096 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:27:24,097 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] [2023-04-01 09:27:24,097 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 09:27:24,097 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:27:24,098 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:27:24,098 INFO L85 PathProgramCache]: Analyzing trace with hash 15706989, now seen corresponding path program 1 times [2023-04-01 09:27:24,098 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:27:24,098 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335917168] [2023-04-01 09:27:24,098 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:24,098 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:27:24,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:24,504 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:27:24,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:27:24,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335917168] [2023-04-01 09:27:24,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335917168] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:27:24,505 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:27:24,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 09:27:24,505 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715035122] [2023-04-01 09:27:24,505 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:27:24,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 09:27:24,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:27:24,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 09:27:24,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 09:27:24,508 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) [2023-04-01 09:27:24,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:27:24,945 INFO L93 Difference]: Finished difference Result 911 states and 1722 transitions. [2023-04-01 09:27:24,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-01 09:27:24,949 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 [2023-04-01 09:27:24,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:27:24,954 INFO L225 Difference]: With dead ends: 911 [2023-04-01 09:27:24,954 INFO L226 Difference]: Without dead ends: 615 [2023-04-01 09:27:24,956 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 [2023-04-01 09:27:24,962 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 [2023-04-01 09:27:24,963 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] [2023-04-01 09:27:24,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2023-04-01 09:27:25,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 603. [2023-04-01 09:27:25,009 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) [2023-04-01 09:27:25,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 1134 transitions. [2023-04-01 09:27:25,012 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 1134 transitions. Word has length 158 [2023-04-01 09:27:25,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:27:25,012 INFO L495 AbstractCegarLoop]: Abstraction has 603 states and 1134 transitions. [2023-04-01 09:27:25,013 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) [2023-04-01 09:27:25,013 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 1134 transitions. [2023-04-01 09:27:25,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2023-04-01 09:27:25,020 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:27:25,021 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] [2023-04-01 09:27:25,021 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 09:27:25,021 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:27:25,021 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:27:25,021 INFO L85 PathProgramCache]: Analyzing trace with hash 1985097225, now seen corresponding path program 1 times [2023-04-01 09:27:25,022 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:27:25,022 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822203424] [2023-04-01 09:27:25,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:25,022 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:27:25,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:25,821 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:27:25,821 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:27:25,821 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822203424] [2023-04-01 09:27:25,821 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822203424] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:27:25,822 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114719681] [2023-04-01 09:27:25,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:25,822 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:27:25,822 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:27:25,829 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) [2023-04-01 09:27:25,838 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-01 09:27:26,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:26,056 INFO L262 TraceCheckSpWp]: Trace formula consists of 861 conjuncts, 8 conjunts are in the unsatisfiable core [2023-04-01 09:27:26,070 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:27:26,315 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 09:27:26,315 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:27:26,577 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-04-01 09:27:26,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114719681] provided 1 perfect and 1 imperfect interpolant sequences [2023-04-01 09:27:26,577 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-04-01 09:27:26,577 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 9 [2023-04-01 09:27:26,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883518322] [2023-04-01 09:27:26,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:27:26,578 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-04-01 09:27:26,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:27:26,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-04-01 09:27:26,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-04-01 09:27:26,580 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) [2023-04-01 09:27:27,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:27:27,202 INFO L93 Difference]: Finished difference Result 1803 states and 3458 transitions. [2023-04-01 09:27:27,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-04-01 09:27:27,202 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 [2023-04-01 09:27:27,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:27:27,213 INFO L225 Difference]: With dead ends: 1803 [2023-04-01 09:27:27,213 INFO L226 Difference]: Without dead ends: 1205 [2023-04-01 09:27:27,217 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 316 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-04-01 09:27:27,219 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 239 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-04-01 09:27:27,221 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [239 Valid, 22 Invalid, 675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-04-01 09:27:27,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1205 states. [2023-04-01 09:27:27,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1205 to 1205. [2023-04-01 09:27:27,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1205 states, 1174 states have (on average 1.7189097103918227) internal successors, (2018), 1185 states have internal predecessors, (2018), 10 states have call successors, (10), 10 states have call predecessors, (10), 20 states have return successors, (91), 9 states have call predecessors, (91), 9 states have call successors, (91) [2023-04-01 09:27:27,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1205 states to 1205 states and 2119 transitions. [2023-04-01 09:27:27,288 INFO L78 Accepts]: Start accepts. Automaton has 1205 states and 2119 transitions. Word has length 160 [2023-04-01 09:27:27,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:27:27,289 INFO L495 AbstractCegarLoop]: Abstraction has 1205 states and 2119 transitions. [2023-04-01 09:27:27,290 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) [2023-04-01 09:27:27,290 INFO L276 IsEmpty]: Start isEmpty. Operand 1205 states and 2119 transitions. [2023-04-01 09:27:27,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2023-04-01 09:27:27,296 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:27:27,296 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, 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] [2023-04-01 09:27:27,303 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-01 09:27:27,503 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 [2023-04-01 09:27:27,503 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:27:27,504 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:27:27,504 INFO L85 PathProgramCache]: Analyzing trace with hash 1298777161, now seen corresponding path program 1 times [2023-04-01 09:27:27,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:27:27,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002730214] [2023-04-01 09:27:27,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:27,505 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:27:27,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:28,038 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:27:28,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:27:28,039 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002730214] [2023-04-01 09:27:28,039 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2002730214] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:27:28,039 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:27:28,039 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 09:27:28,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2328716] [2023-04-01 09:27:28,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:27:28,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 09:27:28,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:27:28,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 09:27:28,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 09:27:28,041 INFO L87 Difference]: Start difference. First operand 1205 states and 2119 transitions. Second operand has 5 states, 5 states have (on average 34.0) internal successors, (170), 4 states have internal predecessors, (170), 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) [2023-04-01 09:27:28,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:27:28,852 INFO L93 Difference]: Finished difference Result 3697 states and 6786 transitions. [2023-04-01 09:27:28,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 09:27:28,853 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 34.0) internal successors, (170), 4 states have internal predecessors, (170), 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 176 [2023-04-01 09:27:28,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:27:28,866 INFO L225 Difference]: With dead ends: 3697 [2023-04-01 09:27:28,866 INFO L226 Difference]: Without dead ends: 2497 [2023-04-01 09:27:28,869 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 [2023-04-01 09:27:28,870 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 486 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 486 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 1045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-04-01 09:27:28,870 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [486 Valid, 41 Invalid, 1045 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-04-01 09:27:28,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2497 states. [2023-04-01 09:27:28,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2497 to 2463. [2023-04-01 09:27:28,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2463 states, 2375 states have (on average 1.6021052631578947) internal successors, (3805), 2427 states have internal predecessors, (3805), 18 states have call successors, (18), 18 states have call predecessors, (18), 69 states have return successors, (394), 17 states have call predecessors, (394), 17 states have call successors, (394) [2023-04-01 09:27:28,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2463 states to 2463 states and 4217 transitions. [2023-04-01 09:27:28,957 INFO L78 Accepts]: Start accepts. Automaton has 2463 states and 4217 transitions. Word has length 176 [2023-04-01 09:27:28,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:27:28,957 INFO L495 AbstractCegarLoop]: Abstraction has 2463 states and 4217 transitions. [2023-04-01 09:27:28,958 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 34.0) internal successors, (170), 4 states have internal predecessors, (170), 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) [2023-04-01 09:27:28,958 INFO L276 IsEmpty]: Start isEmpty. Operand 2463 states and 4217 transitions. [2023-04-01 09:27:28,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2023-04-01 09:27:28,965 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:27:28,965 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 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] [2023-04-01 09:27:28,965 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 09:27:28,965 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:27:28,966 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:27:28,966 INFO L85 PathProgramCache]: Analyzing trace with hash 224754798, now seen corresponding path program 1 times [2023-04-01 09:27:28,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:27:28,968 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252873898] [2023-04-01 09:27:28,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:28,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:27:29,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:29,496 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 41 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 09:27:29,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:27:29,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252873898] [2023-04-01 09:27:29,497 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1252873898] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:27:29,497 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527424795] [2023-04-01 09:27:29,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:27:29,497 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:27:29,497 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:27:29,501 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) [2023-04-01 09:27:29,525 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 09:27:29,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:27:29,777 INFO L262 TraceCheckSpWp]: Trace formula consists of 1192 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 09:27:29,784 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:27:29,829 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 47 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 09:27:29,829 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:27:29,895 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 41 proven. 8 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-04-01 09:27:29,895 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527424795] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:27:29,895 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [226252821] [2023-04-01 09:27:29,955 INFO L159 IcfgInterpreter]: Started Sifa with 153 locations of interest [2023-04-01 09:27:29,955 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:27:29,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:27:29,962 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:27:29,963 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:27:31,282 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 194 for LOIs