/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/recursive/BallRajamani-SPIN2000-Fig1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 12:11:14,178 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 12:11:14,181 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 12:11:14,212 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 12:11:14,213 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 12:11:14,215 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 12:11:14,219 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 12:11:14,221 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 12:11:14,223 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 12:11:14,228 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 12:11:14,230 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 12:11:14,231 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 12:11:14,232 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 12:11:14,235 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 12:11:14,237 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 12:11:14,238 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 12:11:14,239 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 12:11:14,239 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 12:11:14,241 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 12:11:14,252 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 12:11:14,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 12:11:14,256 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 12:11:14,256 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 12:11:14,257 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 12:11:14,262 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 12:11:14,262 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 12:11:14,264 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 12:11:14,265 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 12:11:14,265 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 12:11:14,266 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 12:11:14,266 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 12:11:14,266 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 12:11:14,267 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 12:11:14,267 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 12:11:14,268 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 12:11:14,268 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 12:11:14,269 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 12:11:14,269 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 12:11:14,269 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 12:11:14,270 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 12:11:14,270 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 12:11:14,274 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 12:11:14,305 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 12:11:14,305 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 12:11:14,306 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 12:11:14,306 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 12:11:14,307 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 12:11:14,307 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 12:11:14,307 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 12:11:14,307 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 12:11:14,307 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 12:11:14,307 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 12:11:14,308 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 12:11:14,308 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 12:11:14,308 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 12:11:14,308 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 12:11:14,308 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 12:11:14,308 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 12:11:14,309 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 12:11:14,309 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 12:11:14,309 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 12:11:14,309 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 12:11:14,310 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 12:11:14,311 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 12:11:14,311 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 12:11:14,311 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 12:11:14,311 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 12:11:14,311 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 12:11:14,311 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 12:11:14,311 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 12:11:14,311 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 12:11:14,312 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 12:11:14,312 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 12:11:14,312 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 12:11:14,312 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 12:11:14,312 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 12:11:14,312 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 12:11:14,312 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 12:11:14,543 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 12:11:14,566 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 12:11:14,568 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 12:11:14,569 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 12:11:14,569 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 12:11:14,572 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive/BallRajamani-SPIN2000-Fig1.c [2023-04-01 12:11:15,862 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 12:11:16,071 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 12:11:16,072 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive/BallRajamani-SPIN2000-Fig1.c [2023-04-01 12:11:16,077 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3f283e8d/7a897fb82f554b55af1734c9db39a3a5/FLAGa63ccee1e [2023-04-01 12:11:16,090 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a3f283e8d/7a897fb82f554b55af1734c9db39a3a5 [2023-04-01 12:11:16,092 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 12:11:16,093 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 12:11:16,096 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 12:11:16,096 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 12:11:16,099 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 12:11:16,100 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,101 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a25fc46 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16, skipping insertion in model container [2023-04-01 12:11:16,101 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,107 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 12:11:16,116 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 12:11:16,264 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/recursive/BallRajamani-SPIN2000-Fig1.c[718,731] [2023-04-01 12:11:16,271 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 12:11:16,285 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 12:11:16,297 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/recursive/BallRajamani-SPIN2000-Fig1.c[718,731] [2023-04-01 12:11:16,298 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 12:11:16,309 INFO L208 MainTranslator]: Completed translation [2023-04-01 12:11:16,310 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16 WrapperNode [2023-04-01 12:11:16,310 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 12:11:16,311 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 12:11:16,311 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 12:11:16,311 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 12:11:16,327 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,327 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,334 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,335 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,345 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,347 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,348 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,349 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,352 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 12:11:16,353 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 12:11:16,354 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 12:11:16,354 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 12:11:16,354 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (1/1) ... [2023-04-01 12:11:16,360 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 12:11:16,370 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 12:11:16,384 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 12:11:16,397 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 12:11:16,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 12:11:16,415 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 12:11:16,419 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 12:11:16,419 INFO L138 BoogieDeclarations]: Found implementation of procedure A [2023-04-01 12:11:16,419 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure A [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 12:11:16,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 12:11:16,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 12:11:16,421 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 12:11:16,421 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 12:11:16,421 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 12:11:16,481 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 12:11:16,483 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 12:11:16,584 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 12:11:16,598 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 12:11:16,599 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-04-01 12:11:16,601 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 12:11:16 BoogieIcfgContainer [2023-04-01 12:11:16,601 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 12:11:16,603 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 12:11:16,603 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 12:11:16,606 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 12:11:16,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 12:11:16" (1/3) ... [2023-04-01 12:11:16,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8ceddf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 12:11:16, skipping insertion in model container [2023-04-01 12:11:16,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 12:11:16" (2/3) ... [2023-04-01 12:11:16,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8ceddf3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 12:11:16, skipping insertion in model container [2023-04-01 12:11:16,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 12:11:16" (3/3) ... [2023-04-01 12:11:16,609 INFO L112 eAbstractionObserver]: Analyzing ICFG BallRajamani-SPIN2000-Fig1.c [2023-04-01 12:11:16,644 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 12:11:16,645 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 12:11:16,730 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 12:11:16,736 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;@11514de0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 12:11:16,736 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 12:11:16,752 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-04-01 12:11:16,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-04-01 12:11:16,759 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 12:11:16,760 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 12:11:16,760 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 12:11:16,765 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 12:11:16,765 INFO L85 PathProgramCache]: Analyzing trace with hash 1362501247, now seen corresponding path program 1 times [2023-04-01 12:11:16,798 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 12:11:16,798 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1444336254] [2023-04-01 12:11:16,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 12:11:16,799 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 12:11:16,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 12:11:17,209 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 12:11:17,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 12:11:17,210 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1444336254] [2023-04-01 12:11:17,211 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1444336254] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 12:11:17,211 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198922640] [2023-04-01 12:11:17,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 12:11:17,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 12:11:17,212 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 12:11:17,215 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 12:11:17,216 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 12:11:17,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 12:11:17,279 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 7 conjunts are in the unsatisfiable core [2023-04-01 12:11:17,285 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 12:11:17,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 12:11:17,365 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 12:11:17,471 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-01 12:11:17,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198922640] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 12:11:17,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1187654768] [2023-04-01 12:11:17,546 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-04-01 12:11:17,546 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 12:11:17,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 12:11:17,554 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 12:11:17,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 12:11:17,775 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 47 for LOIs [2023-04-01 12:11:18,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 10 for LOIs [2023-04-01 12:11:18,340 INFO L197 IcfgInterpreter]: Interpreting procedure A with input of size 84 for LOIs [2023-04-01 12:11:18,341 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 7 [2023-04-01 12:11:18,590 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-01 12:11:19,684 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1187654768] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 12:11:19,684 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-04-01 12:11:19,685 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5, 5] total 15 [2023-04-01 12:11:19,687 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387011182] [2023-04-01 12:11:19,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 12:11:19,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-04-01 12:11:19,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 12:11:19,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-04-01 12:11:19,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2023-04-01 12:11:19,712 INFO L87 Difference]: Start difference. First operand has 22 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 11 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 12:11:20,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 12:11:20,924 INFO L93 Difference]: Finished difference Result 48 states and 61 transitions. [2023-04-01 12:11:20,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-04-01 12:11:20,927 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 19 [2023-04-01 12:11:20,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 12:11:20,933 INFO L225 Difference]: With dead ends: 48 [2023-04-01 12:11:20,933 INFO L226 Difference]: Without dead ends: 34 [2023-04-01 12:11:20,936 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2023-04-01 12:11:20,939 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 30 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 145 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 12:11:20,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 71 Invalid, 145 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 12:11:20,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-01 12:11:20,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2023-04-01 12:11:20,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-04-01 12:11:20,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-04-01 12:11:20,981 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 19 [2023-04-01 12:11:20,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 12:11:20,981 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-04-01 12:11:20,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-04-01 12:11:20,982 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-04-01 12:11:20,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-04-01 12:11:20,983 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 12:11:20,983 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 12:11:20,992 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 12:11:21,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2023-04-01 12:11:21,189 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 12:11:21,190 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 12:11:21,190 INFO L85 PathProgramCache]: Analyzing trace with hash 911275641, now seen corresponding path program 1 times [2023-04-01 12:11:21,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 12:11:21,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099925525] [2023-04-01 12:11:21,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 12:11:21,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 12:11:21,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 12:11:21,299 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 12:11:21,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 12:11:21,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099925525] [2023-04-01 12:11:21,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099925525] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 12:11:21,301 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016549244] [2023-04-01 12:11:21,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 12:11:21,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 12:11:21,302 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 12:11:21,303 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 12:11:21,308 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 12:11:21,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 12:11:21,351 INFO L262 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 9 conjunts are in the unsatisfiable core [2023-04-01 12:11:21,353 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 12:11:21,363 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 12:11:21,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 12:11:21,405 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-04-01 12:11:21,405 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016549244] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 12:11:21,405 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1220138238] [2023-04-01 12:11:21,407 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-04-01 12:11:21,407 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 12:11:21,408 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-04-01 12:11:21,412 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-01 12:11:21,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 7 [2023-04-01 12:11:21,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406466937] [2023-04-01 12:11:21,413 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-01 12:11:21,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-01 12:11:21,415 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 12:11:21,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-01 12:11:21,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-04-01 12:11:21,416 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2023-04-01 12:11:21,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 12:11:21,470 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2023-04-01 12:11:21,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 12:11:21,471 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 25 [2023-04-01 12:11:21,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 12:11:21,472 INFO L225 Difference]: With dead ends: 40 [2023-04-01 12:11:21,472 INFO L226 Difference]: Without dead ends: 22 [2023-04-01 12:11:21,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2023-04-01 12:11:21,473 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 6 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-01 12:11:21,477 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 60 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-01 12:11:21,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-04-01 12:11:21,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-04-01 12:11:21,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 13 states have internal predecessors, (14), 5 states have call successors, (5), 4 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 4 states have call successors, (5) [2023-04-01 12:11:21,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2023-04-01 12:11:21,484 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 25 [2023-04-01 12:11:21,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 12:11:21,484 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2023-04-01 12:11:21,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 3 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2023-04-01 12:11:21,485 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2023-04-01 12:11:21,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-04-01 12:11:21,485 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 12:11:21,486 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 12:11:21,499 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-04-01 12:11:21,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-04-01 12:11:21,691 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting mainErr0ASSERT_VIOLATIONERROR_FUNCTION === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 12:11:21,691 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 12:11:21,691 INFO L85 PathProgramCache]: Analyzing trace with hash 966998963, now seen corresponding path program 2 times [2023-04-01 12:11:21,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 12:11:21,692 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200636408] [2023-04-01 12:11:21,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 12:11:21,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 12:11:21,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-04-01 12:11:21,706 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-04-01 12:11:21,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-04-01 12:11:21,757 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2023-04-01 12:11:21,758 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-04-01 12:11:21,758 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location mainErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-04-01 12:11:21,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-01 12:11:21,764 INFO L445 BasicCegarLoop]: Path program histogram: [2, 1] [2023-04-01 12:11:21,767 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-04-01 12:11:21,804 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 01.04 12:11:21 BoogieIcfgContainer [2023-04-01 12:11:21,804 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-04-01 12:11:21,805 INFO L158 Benchmark]: Toolchain (without parser) took 5711.63ms. Allocated memory was 223.3MB in the beginning and 268.4MB in the end (delta: 45.1MB). Free memory was 175.8MB in the beginning and 92.6MB in the end (delta: 83.2MB). Peak memory consumption was 128.8MB. Max. memory is 8.0GB. [2023-04-01 12:11:21,805 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 185.6MB. Free memory is still 132.0MB. There was no memory consumed. Max. memory is 8.0GB. [2023-04-01 12:11:21,805 INFO L158 Benchmark]: CACSL2BoogieTranslator took 214.27ms. Allocated memory is still 223.3MB. Free memory was 175.2MB in the beginning and 165.3MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2023-04-01 12:11:21,805 INFO L158 Benchmark]: Boogie Preprocessor took 41.65ms. Allocated memory is still 223.3MB. Free memory was 165.3MB in the beginning and 164.2MB in the end (delta: 1.1MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. [2023-04-01 12:11:21,806 INFO L158 Benchmark]: RCFGBuilder took 247.72ms. Allocated memory is still 223.3MB. Free memory was 164.2MB in the beginning and 153.2MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. [2023-04-01 12:11:21,806 INFO L158 Benchmark]: TraceAbstraction took 5201.49ms. Allocated memory was 223.3MB in the beginning and 268.4MB in the end (delta: 45.1MB). Free memory was 152.7MB in the beginning and 92.6MB in the end (delta: 60.1MB). Peak memory consumption was 105.7MB. Max. memory is 8.0GB. [2023-04-01 12:11:21,807 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23ms. Allocated memory is still 185.6MB. Free memory is still 132.0MB. There was no memory consumed. Max. memory is 8.0GB. * CACSL2BoogieTranslator took 214.27ms. Allocated memory is still 223.3MB. Free memory was 175.2MB in the beginning and 165.3MB in the end (delta: 10.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * Boogie Preprocessor took 41.65ms. Allocated memory is still 223.3MB. Free memory was 165.3MB in the beginning and 164.2MB in the end (delta: 1.1MB). Peak memory consumption was 1.0MB. Max. memory is 8.0GB. * RCFGBuilder took 247.72ms. Allocated memory is still 223.3MB. Free memory was 164.2MB in the beginning and 153.2MB in the end (delta: 11.0MB). Peak memory consumption was 10.5MB. Max. memory is 8.0GB. * TraceAbstraction took 5201.49ms. Allocated memory was 223.3MB in the beginning and 268.4MB in the end (delta: 45.1MB). Free memory was 152.7MB in the beginning and 92.6MB in the end (delta: 60.1MB). Peak memory consumption was 105.7MB. Max. memory is 8.0GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 33]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int g; [L28] int g = __VERIFIER_nondet_int(); [L29] int h = !g; VAL [\old(g)=0, g=-1, g=0, h=0] [L30] CALL A(g,h) VAL [\old(a1)=-1, \old(a2)=0, \old(g)=0, g=0] [L19] COND TRUE \read(a1) VAL [\old(a1)=-1, \old(a2)=0, \old(g)=0, a1=-1, a2=0, g=0] [L20] CALL A(a2,a1) VAL [\old(a1)=0, \old(a2)=-1, \old(g)=0, g=0] [L19] COND FALSE !(\read(a1)) [L22] g = a2 VAL [\old(a1)=0, \old(a2)=-1, \old(g)=0, a1=0, a2=-1, g=-1] [L20] RET A(a2,a1) VAL [A(a2,a1)=-2, \old(a1)=-1, \old(a2)=0, \old(g)=0, a1=-1, a2=0, g=-1] [L30] RET A(g,h) VAL [A(g,h)=-3, \old(g)=0, g=-1, g=-1, h=0] [L31] CALL A(g,h) VAL [\old(a1)=-1, \old(a2)=0, \old(g)=-1, g=-1] [L19] COND TRUE \read(a1) VAL [\old(a1)=-1, \old(a2)=0, \old(g)=-1, a1=-1, a2=0, g=-1] [L20] CALL A(a2,a1) VAL [\old(a1)=0, \old(a2)=-1, \old(g)=-1, g=-1] [L19] COND FALSE !(\read(a1)) [L22] g = a2 VAL [\old(a1)=0, \old(a2)=-1, \old(g)=-1, a1=0, a2=-1, g=-1] [L20] RET A(a2,a1) VAL [A(a2,a1)=4, \old(a1)=-1, \old(a2)=0, \old(g)=-1, a1=-1, a2=0, g=-1] [L31] RET A(g,h) VAL [A(g,h)=-4, \old(g)=0, g=-1, g=-1, h=0] [L32] COND TRUE \read(g) VAL [\old(g)=0, g=-1, g=-1, h=0] [L33] reach_error() VAL [\old(g)=0, g=-1, g=-1, h=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 5.0s, OverallIterations: 3, TraceHistogramMax: 4, PathProgramHistogramMax: 2, EmptinessCheckTime: 0.0s, AutomataDifference: 1.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 36 SdHoareTripleChecker+Valid, 0.2s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 36 mSDsluCounter, 131 SdHoareTripleChecker+Invalid, 0.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 103 mSDsCounter, 23 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 192 IncrementalHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 23 mSolverCounterUnsat, 28 mSDtfsCounter, 192 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 127 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 2.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=1, InterpolantAutomatonStates: 21, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 10 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 119 NumberOfCodeBlocks, 119 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 126 ConstructedInterpolants, 0 QuantifiedInterpolants, 338 SizeOfPredicates, 3 NumberOfNonLiveVariables, 210 ConjunctsInSsa, 16 ConjunctsInUnsatCore, 6 InterpolantComputations, 0 PerfectInterpolantSequences, 21/48 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 1.0s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 4, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 16, DAG_INTERPRETER_EARLY_EXITS: 1, TOOLS_POST_APPLICATIONS: 12, TOOLS_POST_TIME: 0.2s, TOOLS_POST_CALL_APPLICATIONS: 10, TOOLS_POST_CALL_TIME: 0.2s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.2s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 28, TOOLS_QUANTIFIERELIM_TIME: 0.6s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.1s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 44, FLUID_YES_ANSWERS: 1, DOMAIN_JOIN_APPLICATIONS: 7, DOMAIN_JOIN_TIME: 0.2s, DOMAIN_ALPHA_APPLICATIONS: 1, DOMAIN_ALPHA_TIME: 0.1s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 16, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 2, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 108, DAG_COMPRESSION_RETAINED_NODES: 52, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2023-04-01 12:11:21,843 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request...