/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/Problem01_label03.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-01 09:13:05,251 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-01 09:13:05,252 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-01 09:13:05,276 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-01 09:13:05,276 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-01 09:13:05,277 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-01 09:13:05,278 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-01 09:13:05,279 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-01 09:13:05,280 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-01 09:13:05,280 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-01 09:13:05,281 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-01 09:13:05,282 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-01 09:13:05,282 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-01 09:13:05,283 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-01 09:13:05,283 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-01 09:13:05,284 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-01 09:13:05,284 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-01 09:13:05,285 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-01 09:13:05,286 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-01 09:13:05,287 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-01 09:13:05,288 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-01 09:13:05,288 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-01 09:13:05,289 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-01 09:13:05,289 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-01 09:13:05,292 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-01 09:13:05,292 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-01 09:13:05,292 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-01 09:13:05,292 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-01 09:13:05,293 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-01 09:13:05,293 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-01 09:13:05,293 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-01 09:13:05,294 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-01 09:13:05,294 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-01 09:13:05,295 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-01 09:13:05,295 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-01 09:13:05,295 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-01 09:13:05,296 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-01 09:13:05,296 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-01 09:13:05,296 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-01 09:13:05,297 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-01 09:13:05,297 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-01 09:13:05,298 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 09:13:05,326 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-01 09:13:05,326 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-01 09:13:05,326 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-01 09:13:05,327 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-01 09:13:05,327 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-01 09:13:05,327 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-01 09:13:05,327 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-01 09:13:05,327 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-01 09:13:05,328 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-01 09:13:05,329 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-01 09:13:05,329 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-01 09:13:05,329 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-01 09:13:05,329 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-01 09:13:05,329 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-01 09:13:05,330 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-01 09:13:05,331 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-01 09:13:05,331 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-01 09:13:05,331 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-01 09:13:05,331 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-01 09:13:05,331 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-01 09:13:05,331 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:13:05,331 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-01 09:13:05,332 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-01 09:13:05,332 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> EqDomain [2023-04-01 09:13:05,495 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-01 09:13:05,511 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-01 09:13:05,526 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-01 09:13:05,527 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-01 09:13:05,528 INFO L275 PluginConnector]: CDTParser initialized [2023-04-01 09:13:05,529 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem01_label03.c [2023-04-01 09:13:06,569 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-01 09:13:06,769 INFO L351 CDTParser]: Found 1 translation units. [2023-04-01 09:13:06,770 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem01_label03.c [2023-04-01 09:13:06,785 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d7909ea2/b7d34653bd2d43078288b0a0a4c9873e/FLAG15fbde06e [2023-04-01 09:13:06,794 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7d7909ea2/b7d34653bd2d43078288b0a0a4c9873e [2023-04-01 09:13:06,796 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-01 09:13:06,797 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-01 09:13:06,797 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-01 09:13:06,797 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-01 09:13:06,801 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-01 09:13:06,802 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:13:06" (1/1) ... [2023-04-01 09:13:06,802 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@16d56a02 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:06, skipping insertion in model container [2023-04-01 09:13:06,803 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.04 09:13:06" (1/1) ... [2023-04-01 09:13:06,808 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-01 09:13:06,846 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-01 09:13:07,044 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/Problem01_label03.c[21586,21599] [2023-04-01 09:13:07,058 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:13:07,073 INFO L203 MainTranslator]: Completed pre-run [2023-04-01 09:13:07,136 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/Problem01_label03.c[21586,21599] [2023-04-01 09:13:07,139 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-01 09:13:07,149 INFO L208 MainTranslator]: Completed translation [2023-04-01 09:13:07,149 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07 WrapperNode [2023-04-01 09:13:07,149 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-01 09:13:07,150 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-01 09:13:07,150 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-01 09:13:07,150 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-01 09:13:07,160 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,160 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,171 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,171 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,214 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,218 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,221 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,224 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,228 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-01 09:13:07,228 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-01 09:13:07,228 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-01 09:13:07,228 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-01 09:13:07,229 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (1/1) ... [2023-04-01 09:13:07,233 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-01 09:13:07,241 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:13:07,250 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 09:13:07,266 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 09:13:07,278 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-01 09:13:07,279 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-01 09:13:07,279 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-01 09:13:07,280 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-01 09:13:07,280 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-01 09:13:07,280 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-01 09:13:07,281 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-01 09:13:07,281 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-01 09:13:07,281 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-01 09:13:07,281 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-01 09:13:07,281 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-01 09:13:07,354 INFO L236 CfgBuilder]: Building ICFG [2023-04-01 09:13:07,356 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-01 09:13:08,108 INFO L277 CfgBuilder]: Performing block encoding [2023-04-01 09:13:08,256 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-01 09:13:08,256 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-01 09:13:08,259 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:13:08 BoogieIcfgContainer [2023-04-01 09:13:08,259 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-01 09:13:08,262 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-01 09:13:08,262 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-01 09:13:08,264 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-01 09:13:08,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.04 09:13:06" (1/3) ... [2023-04-01 09:13:08,265 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e7f0569 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:13:08, skipping insertion in model container [2023-04-01 09:13:08,265 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.04 09:13:07" (2/3) ... [2023-04-01 09:13:08,265 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4e7f0569 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.04 09:13:08, skipping insertion in model container [2023-04-01 09:13:08,265 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.04 09:13:08" (3/3) ... [2023-04-01 09:13:08,266 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem01_label03.c [2023-04-01 09:13:08,277 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-01 09:13:08,277 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-01 09:13:08,315 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-01 09:13:08,321 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;@768239a0, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-01 09:13:08,321 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-01 09:13:08,324 INFO L276 IsEmpty]: Start isEmpty. Operand has 86 states, 78 states have (on average 1.8974358974358974) internal successors, (148), 79 states have internal predecessors, (148), 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 09:13:08,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-04-01 09:13:08,331 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:13:08,332 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] [2023-04-01 09:13:08,332 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:13:08,337 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:13:08,337 INFO L85 PathProgramCache]: Analyzing trace with hash -2062130206, now seen corresponding path program 1 times [2023-04-01 09:13:08,343 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:13:08,344 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582801833] [2023-04-01 09:13:08,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:08,344 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:13:08,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:08,877 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 09:13:08,877 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:13:08,878 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582801833] [2023-04-01 09:13:08,878 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582801833] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:13:08,878 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:13:08,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-01 09:13:08,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136472727] [2023-04-01 09:13:08,880 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:13:08,884 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 09:13:08,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:13:08,904 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 09:13:08,904 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-01 09:13:08,906 INFO L87 Difference]: Start difference. First operand has 86 states, 78 states have (on average 1.8974358974358974) internal successors, (148), 79 states have internal predecessors, (148), 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 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 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 09:13:09,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:13:09,159 INFO L93 Difference]: Finished difference Result 246 states and 454 transitions. [2023-04-01 09:13:09,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 09:13:09,160 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 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 77 [2023-04-01 09:13:09,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:13:09,171 INFO L225 Difference]: With dead ends: 246 [2023-04-01 09:13:09,172 INFO L226 Difference]: Without dead ends: 157 [2023-04-01 09:13:09,174 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 09:13:09,176 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 31 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 217 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 217 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:13:09,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 48 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 217 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:13:09,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-04-01 09:13:09,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2023-04-01 09:13:09,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 149 states have (on average 1.7718120805369129) internal successors, (264), 149 states have internal predecessors, (264), 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 09:13:09,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 273 transitions. [2023-04-01 09:13:09,220 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 273 transitions. Word has length 77 [2023-04-01 09:13:09,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:13:09,222 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 273 transitions. [2023-04-01 09:13:09,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 24.333333333333332) internal successors, (73), 2 states have internal predecessors, (73), 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 09:13:09,223 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 273 transitions. [2023-04-01 09:13:09,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2023-04-01 09:13:09,228 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:13:09,228 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-04-01 09:13:09,229 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-01 09:13:09,229 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:13:09,229 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:13:09,229 INFO L85 PathProgramCache]: Analyzing trace with hash 1470133308, now seen corresponding path program 1 times [2023-04-01 09:13:09,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:13:09,229 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938141179] [2023-04-01 09:13:09,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:09,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:13:09,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:09,414 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:13:09,415 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:13:09,415 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938141179] [2023-04-01 09:13:09,415 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938141179] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:13:09,415 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:13:09,415 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 09:13:09,415 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773067937] [2023-04-01 09:13:09,415 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:13:09,416 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 09:13:09,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:13:09,417 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 09:13:09,417 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 09:13:09,417 INFO L87 Difference]: Start difference. First operand 157 states and 273 transitions. Second operand has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 states have internal predecessors, (81), 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 09:13:09,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:13:09,748 INFO L93 Difference]: Finished difference Result 479 states and 861 transitions. [2023-04-01 09:13:09,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-01 09:13:09,749 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 states have internal predecessors, (81), 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 87 [2023-04-01 09:13:09,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:13:09,754 INFO L225 Difference]: With dead ends: 479 [2023-04-01 09:13:09,754 INFO L226 Difference]: Without dead ends: 327 [2023-04-01 09:13:09,759 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 09:13:09,761 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 269 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 409 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 269 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 09:13:09,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [269 Valid, 40 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 409 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 09:13:09,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2023-04-01 09:13:09,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 315. [2023-04-01 09:13:09,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 299 states have (on average 1.7290969899665551) internal successors, (517), 303 states have internal predecessors, (517), 6 states have call successors, (6), 6 states have call predecessors, (6), 9 states have return successors, (21), 5 states have call predecessors, (21), 5 states have call successors, (21) [2023-04-01 09:13:09,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 544 transitions. [2023-04-01 09:13:09,816 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 544 transitions. Word has length 87 [2023-04-01 09:13:09,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:13:09,816 INFO L495 AbstractCegarLoop]: Abstraction has 315 states and 544 transitions. [2023-04-01 09:13:09,816 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 16.2) internal successors, (81), 4 states have internal predecessors, (81), 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 09:13:09,816 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 544 transitions. [2023-04-01 09:13:09,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-04-01 09:13:09,818 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:13:09,818 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:13:09,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-01 09:13:09,818 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:13:09,819 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:13:09,819 INFO L85 PathProgramCache]: Analyzing trace with hash -1308821806, now seen corresponding path program 1 times [2023-04-01 09:13:09,819 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:13:09,819 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [743178807] [2023-04-01 09:13:09,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:09,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:13:09,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:10,382 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:13:10,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:13:10,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [743178807] [2023-04-01 09:13:10,383 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [743178807] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:13:10,383 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1766128336] [2023-04-01 09:13:10,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:10,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:13:10,383 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:13:10,386 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 09:13:10,386 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 09:13:10,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:10,479 INFO L262 TraceCheckSpWp]: Trace formula consists of 407 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 09:13:10,483 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:13:10,629 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-01 09:13:10,629 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 09:13:10,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1766128336] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:13:10,630 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 09:13:10,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2023-04-01 09:13:10,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41876974] [2023-04-01 09:13:10,630 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:13:10,630 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 09:13:10,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:13:10,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 09:13:10,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-04-01 09:13:10,631 INFO L87 Difference]: Start difference. First operand 315 states and 544 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:13:10,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:13:10,876 INFO L93 Difference]: Finished difference Result 775 states and 1360 transitions. [2023-04-01 09:13:10,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 09:13:10,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 88 [2023-04-01 09:13:10,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:13:10,880 INFO L225 Difference]: With dead ends: 775 [2023-04-01 09:13:10,880 INFO L226 Difference]: Without dead ends: 465 [2023-04-01 09:13:10,881 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-04-01 09:13:10,881 INFO L413 NwaCegarLoop]: 142 mSDtfsCounter, 2 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 216 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:13:10,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 155 Invalid, 282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 216 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:13:10,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 465 states. [2023-04-01 09:13:10,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 465 to 465. [2023-04-01 09:13:10,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 445 states have (on average 1.6247191011235955) internal successors, (723), 449 states have internal predecessors, (723), 8 states have call successors, (8), 8 states have call predecessors, (8), 11 states have return successors, (40), 7 states have call predecessors, (40), 7 states have call successors, (40) [2023-04-01 09:13:10,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 771 transitions. [2023-04-01 09:13:10,910 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 771 transitions. Word has length 88 [2023-04-01 09:13:10,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:13:10,911 INFO L495 AbstractCegarLoop]: Abstraction has 465 states and 771 transitions. [2023-04-01 09:13:10,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-04-01 09:13:10,911 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 771 transitions. [2023-04-01 09:13:10,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-04-01 09:13:10,914 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:13:10,914 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] [2023-04-01 09:13:10,931 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-01 09:13:11,121 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:13:11,121 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:13:11,122 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:13:11,122 INFO L85 PathProgramCache]: Analyzing trace with hash 1481870154, now seen corresponding path program 1 times [2023-04-01 09:13:11,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:13:11,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594768247] [2023-04-01 09:13:11,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:11,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:13:11,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:11,366 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 09:13:11,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:13:11,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594768247] [2023-04-01 09:13:11,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1594768247] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:13:11,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-01 09:13:11,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-01 09:13:11,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334295172] [2023-04-01 09:13:11,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:13:11,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-01 09:13:11,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:13:11,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-01 09:13:11,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-01 09:13:11,370 INFO L87 Difference]: Start difference. First operand 465 states and 771 transitions. Second operand has 5 states, 5 states have (on average 17.2) internal successors, (86), 4 states have internal predecessors, (86), 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 09:13:11,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:13:11,687 INFO L93 Difference]: Finished difference Result 1346 states and 2324 transitions. [2023-04-01 09:13:11,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-01 09:13:11,688 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 4 states have internal predecessors, (86), 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 92 [2023-04-01 09:13:11,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:13:11,692 INFO L225 Difference]: With dead ends: 1346 [2023-04-01 09:13:11,692 INFO L226 Difference]: Without dead ends: 886 [2023-04-01 09:13:11,693 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 09:13:11,693 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 245 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 402 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 537 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-04-01 09:13:11,694 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [245 Valid, 44 Invalid, 537 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 402 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-04-01 09:13:11,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 886 states. [2023-04-01 09:13:11,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 886 to 797. [2023-04-01 09:13:11,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 797 states, 753 states have (on average 1.4409030544488712) internal successors, (1085), 773 states have internal predecessors, (1085), 12 states have call successors, (12), 12 states have call predecessors, (12), 31 states have return successors, (137), 11 states have call predecessors, (137), 11 states have call successors, (137) [2023-04-01 09:13:11,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 797 states to 797 states and 1234 transitions. [2023-04-01 09:13:11,736 INFO L78 Accepts]: Start accepts. Automaton has 797 states and 1234 transitions. Word has length 92 [2023-04-01 09:13:11,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:13:11,736 INFO L495 AbstractCegarLoop]: Abstraction has 797 states and 1234 transitions. [2023-04-01 09:13:11,736 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 17.2) internal successors, (86), 4 states have internal predecessors, (86), 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 09:13:11,736 INFO L276 IsEmpty]: Start isEmpty. Operand 797 states and 1234 transitions. [2023-04-01 09:13:11,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2023-04-01 09:13:11,738 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:13:11,739 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2023-04-01 09:13:11,739 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-04-01 09:13:11,739 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:13:11,739 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:13:11,739 INFO L85 PathProgramCache]: Analyzing trace with hash 1292211050, now seen corresponding path program 1 times [2023-04-01 09:13:11,739 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:13:11,740 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874032765] [2023-04-01 09:13:11,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:11,740 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:13:11,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:11,996 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 28 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-01 09:13:11,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:13:11,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874032765] [2023-04-01 09:13:11,996 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874032765] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:13:11,996 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [644457809] [2023-04-01 09:13:11,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:11,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:13:11,997 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:13:11,998 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:13:12,000 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-01 09:13:12,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:12,098 INFO L262 TraceCheckSpWp]: Trace formula consists of 475 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 09:13:12,101 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:13:12,195 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 31 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-04-01 09:13:12,195 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-01 09:13:12,196 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [644457809] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-01 09:13:12,196 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-01 09:13:12,196 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2023-04-01 09:13:12,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866830792] [2023-04-01 09:13:12,196 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-01 09:13:12,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-01 09:13:12,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-01 09:13:12,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-01 09:13:12,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-01 09:13:12,198 INFO L87 Difference]: Start difference. First operand 797 states and 1234 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:13:12,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-01 09:13:12,394 INFO L93 Difference]: Finished difference Result 1745 states and 2769 transitions. [2023-04-01 09:13:12,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-01 09:13:12,394 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 111 [2023-04-01 09:13:12,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-01 09:13:12,399 INFO L225 Difference]: With dead ends: 1745 [2023-04-01 09:13:12,400 INFO L226 Difference]: Without dead ends: 953 [2023-04-01 09:13:12,401 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-04-01 09:13:12,403 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 8 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-01 09:13:12,403 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 149 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-01 09:13:12,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 953 states. [2023-04-01 09:13:12,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 953 to 878. [2023-04-01 09:13:12,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 878 states, 829 states have (on average 1.3775633293124245) internal successors, (1142), 852 states have internal predecessors, (1142), 13 states have call successors, (13), 13 states have call predecessors, (13), 35 states have return successors, (140), 12 states have call predecessors, (140), 12 states have call successors, (140) [2023-04-01 09:13:12,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 878 states to 878 states and 1295 transitions. [2023-04-01 09:13:12,433 INFO L78 Accepts]: Start accepts. Automaton has 878 states and 1295 transitions. Word has length 111 [2023-04-01 09:13:12,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-01 09:13:12,434 INFO L495 AbstractCegarLoop]: Abstraction has 878 states and 1295 transitions. [2023-04-01 09:13:12,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-04-01 09:13:12,435 INFO L276 IsEmpty]: Start isEmpty. Operand 878 states and 1295 transitions. [2023-04-01 09:13:12,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2023-04-01 09:13:12,437 INFO L187 NwaCegarLoop]: Found error trace [2023-04-01 09:13:12,438 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-01 09:13:12,453 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-01 09:13:12,645 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:13:12,645 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-01 09:13:12,646 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-01 09:13:12,646 INFO L85 PathProgramCache]: Analyzing trace with hash -930644290, now seen corresponding path program 1 times [2023-04-01 09:13:12,646 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-01 09:13:12,646 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919121041] [2023-04-01 09:13:12,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:12,646 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-01 09:13:12,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:13,062 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 86 proven. 30 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2023-04-01 09:13:13,062 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-01 09:13:13,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919121041] [2023-04-01 09:13:13,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [919121041] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-01 09:13:13,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406286553] [2023-04-01 09:13:13,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-01 09:13:13,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-01 09:13:13,063 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-01 09:13:13,064 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-01 09:13:13,066 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-01 09:13:13,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-01 09:13:13,177 INFO L262 TraceCheckSpWp]: Trace formula consists of 584 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-01 09:13:13,186 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-01 09:13:13,242 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-01 09:13:13,242 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-01 09:13:13,354 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 129 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-04-01 09:13:13,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406286553] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-01 09:13:13,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020956754] [2023-04-01 09:13:13,390 INFO L159 IcfgInterpreter]: Started Sifa with 81 locations of interest [2023-04-01 09:13:13,390 INFO L166 IcfgInterpreter]: Building call graph [2023-04-01 09:13:13,393 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-01 09:13:13,396 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-01 09:13:13,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-01 09:13:13,708 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 104 for LOIs [2023-04-01 09:13:38,784 WARN L223 SmtUtils]: Spent 20.33s on a formula simplification. DAG size of input: 1232 DAG size of output: 1230 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm)