/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/Problem02_label30.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 09:20:11,360 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 09:20:11,361 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 09:20:11,392 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 09:20:11,392 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 09:20:11,394 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 09:20:11,397 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 09:20:11,398 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 09:20:11,399 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 09:20:11,403 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 09:20:11,403 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 09:20:11,404 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 09:20:11,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 09:20:11,406 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 09:20:11,406 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 09:20:11,407 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 09:20:11,408 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 09:20:11,408 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 09:20:11,410 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 09:20:11,413 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 09:20:11,414 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 09:20:11,415 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 09:20:11,415 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 09:20:11,416 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 09:20:11,422 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 09:20:11,422 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 09:20:11,422 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 09:20:11,423 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 09:20:11,424 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 09:20:11,424 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 09:20:11,424 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 09:20:11,425 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 09:20:11,426 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 09:20:11,426 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 09:20:11,426 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 09:20:11,427 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 09:20:11,427 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 09:20:11,427 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 09:20:11,427 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 09:20:11,428 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 09:20:11,428 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 09:20:11,429 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 09:20:11,451 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 09:20:11,451 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 09:20:11,451 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 09:20:11,452 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 09:20:11,452 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 09:20:11,452 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 09:20:11,452 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 09:20:11,452 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 09:20:11,452 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 09:20:11,453 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 09:20:11,453 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 09:20:11,453 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 09:20:11,453 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 09:20:11,453 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 09:20:11,454 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 09:20:11,454 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 09:20:11,454 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 09:20:11,455 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 09:20:11,455 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:20:11,456 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 09:20:11,456 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 09:20:11,456 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 09:20:11,646 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 09:20:11,664 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 09:20:11,665 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 09:20:11,666 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 09:20:11,666 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 09:20:11,667 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem02_label30.c [2023-04-01 09:20:12,712 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 09:20:12,859 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 09:20:12,860 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem02_label30.c [2023-04-01 09:20:12,867 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09341964c/f75b76d7b63448e8a4824eb1eba1d46a/FLAG740d9ef65 [2023-04-01 09:20:12,877 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/09341964c/f75b76d7b63448e8a4824eb1eba1d46a [2023-04-01 09:20:12,879 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 09:20:12,880 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 09:20:12,881 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 09:20:12,881 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 09:20:12,883 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 09:20:12,883 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:20:12" (1/1) ... [2023-04-01 09:20:12,884 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e7641f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:12, skipping insertion in model container [2023-04-01 09:20:12,884 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:20:12" (1/1) ... [2023-04-01 09:20:12,888 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 09:20:12,922 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 09:20:13,161 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem02_label30.c[19968,19981] [2023-04-01 09:20:13,180 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:20:13,187 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 09:20:13,247 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem02_label30.c[19968,19981] [2023-04-01 09:20:13,251 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:20:13,261 INFO L208 MainTranslator]: Completed translation [2023-04-01 09:20:13,261 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13 WrapperNode [2023-04-01 09:20:13,262 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 09:20:13,262 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 09:20:13,262 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 09:20:13,262 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 09:20:13,269 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,317 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,317 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,344 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,361 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,364 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,366 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,370 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 09:20:13,370 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 09:20:13,370 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 09:20:13,371 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 09:20:13,371 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (1/1) ... [2023-04-01 09:20:13,375 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:20:13,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:20:13,391 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 09:20:13,417 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 09:20:13,433 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 09:20:13,433 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 09:20:13,433 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 09:20:13,433 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-01 09:20:13,433 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 09:20:13,433 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-01 09:20:13,433 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 09:20:13,434 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 09:20:13,481 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 09:20:13,483 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 09:20:14,132 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 09:20:14,370 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 09:20:14,371 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 09:20:14,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:20:14 BoogieIcfgContainer [2023-04-01 09:20:14,373 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 09:20:14,375 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 09:20:14,375 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 09:20:14,377 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 09:20:14,377 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 09:20:12" (1/3) ... [2023-04-01 09:20:14,377 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52377af7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:20:14, skipping insertion in model container [2023-04-01 09:20:14,377 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:20:13" (2/3) ... [2023-04-01 09:20:14,377 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52377af7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:20:14, skipping insertion in model container [2023-04-01 09:20:14,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:20:14" (3/3) ... [2023-04-01 09:20:14,378 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem02_label30.c [2023-04-01 09:20:14,389 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 09:20:14,389 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 09:20:14,429 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 09:20:14,434 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;@55a10597, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 09:20:14,434 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 09:20:14,437 INFO L276 IsEmpty]: Start isEmpty. Operand has 95 states, 87 states have (on average 1.9080459770114941) internal successors, (166), 88 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 09:20:14,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2023-04-01 09:20:14,445 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:20:14,445 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:20:14,446 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:20:14,450 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:20:14,450 INFO L85 PathProgramCache]: Analyzing trace with hash -2027404840, now seen corresponding path program 1 times [2023-04-01 09:20:14,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:20:14,456 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810346005] [2023-04-01 09:20:14,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:20:14,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:20:14,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:20:15,028 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 09:20:15,029 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:20:15,029 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810346005] [2023-04-01 09:20:15,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1810346005] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:20:15,030 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:20:15,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 09:20:15,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124666298] [2023-04-01 09:20:15,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:20:15,036 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 09:20:15,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:20:15,063 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 09:20:15,064 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 09:20:15,066 INFO L87 Difference]: Start difference. First operand has 95 states, 87 states have (on average 1.9080459770114941) internal successors, (166), 88 states have internal predecessors, (166), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 09:20:15,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:20:15,373 INFO L93 Difference]: Finished difference Result 273 states and 508 transitions. [2023-04-01 09:20:15,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 09:20:15,374 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 86 [2023-04-01 09:20:15,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:20:15,386 INFO L225 Difference]: With dead ends: 273 [2023-04-01 09:20:15,387 INFO L226 Difference]: Without dead ends: 175 [2023-04-01 09:20:15,389 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 09:20:15,392 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 63 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:20:15,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 30 Invalid, 317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:20:15,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2023-04-01 09:20:15,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 175. [2023-04-01 09:20:15,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 167 states have (on average 1.904191616766467) internal successors, (318), 167 states have internal predecessors, (318), 4 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-04-01 09:20:15,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 327 transitions. [2023-04-01 09:20:15,442 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 327 transitions. Word has length 86 [2023-04-01 09:20:15,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:20:15,443 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 327 transitions. [2023-04-01 09:20:15,443 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 2 states have internal predecessors, (82), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-04-01 09:20:15,443 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 327 transitions. [2023-04-01 09:20:15,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2023-04-01 09:20:15,446 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:20:15,447 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:20:15,447 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 09:20:15,447 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:20:15,447 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:20:15,447 INFO L85 PathProgramCache]: Analyzing trace with hash -38915330, now seen corresponding path program 1 times [2023-04-01 09:20:15,447 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:20:15,448 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940730146] [2023-04-01 09:20:15,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:20:15,448 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:20:15,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:20:15,673 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:20:15,673 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:20:15,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940730146] [2023-04-01 09:20:15,674 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940730146] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:20:15,674 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:20:15,674 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 09:20:15,674 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250838386] [2023-04-01 09:20:15,674 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:20:15,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 09:20:15,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:20:15,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 09:20:15,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 09:20:15,677 INFO L87 Difference]: Start difference. First operand 175 states and 327 transitions. Second operand has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:20:16,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:20:16,060 INFO L93 Difference]: Finished difference Result 531 states and 1004 transitions. [2023-04-01 09:20:16,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 09:20:16,060 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 101 [2023-04-01 09:20:16,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:20:16,062 INFO L225 Difference]: With dead ends: 531 [2023-04-01 09:20:16,062 INFO L226 Difference]: Without dead ends: 361 [2023-04-01 09:20:16,063 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 09:20:16,064 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 364 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 481 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 481 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 09:20:16,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [364 Valid, 51 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 481 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 09:20:16,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2023-04-01 09:20:16,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 353. [2023-04-01 09:20:16,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 336 states have (on average 1.8095238095238095) internal successors, (608), 341 states have internal predecessors, (608), 6 states have call successors, (6), 6 states have call predecessors, (6), 10 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) [2023-04-01 09:20:16,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 635 transitions. [2023-04-01 09:20:16,085 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 635 transitions. Word has length 101 [2023-04-01 09:20:16,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:20:16,088 INFO L495 AbstractCegarLoop]: Abstraction has 353 states and 635 transitions. [2023-04-01 09:20:16,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 19.0) internal successors, (95), 4 states have internal predecessors, (95), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-01 09:20:16,088 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 635 transitions. [2023-04-01 09:20:16,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2023-04-01 09:20:16,091 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:20:16,092 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-04-01 09:20:16,092 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 09:20:16,092 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:20:16,092 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:20:16,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1311012430, now seen corresponding path program 1 times [2023-04-01 09:20:16,092 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:20:16,093 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1139818255] [2023-04-01 09:20:16,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:20:16,093 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:20:16,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:20:16,568 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:20:16,569 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:20:16,569 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1139818255] [2023-04-01 09:20:16,569 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1139818255] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:20:16,570 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714630318] [2023-04-01 09:20:16,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:20:16,570 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:20:16,570 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:20:16,583 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 09:20:16,584 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 09:20:16,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:20:16,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 09:20:16,683 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:20:16,795 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:20:16,795 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:20:16,922 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 23 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:20:16,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714630318] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:20:16,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [822239710] [2023-04-01 09:20:16,961 INFO L159 IcfgInterpreter]: Started Sifa with 90 locations of interest [2023-04-01 09:20:16,961 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:20:16,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:20:16,967 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:20:16,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:20:17,267 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 98 for LOIs