/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 IntervalDomain -i ../sv-benchmarks/c/eca-rers2012/Problem03_label07.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 21:18:12,084 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 21:18:12,086 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 21:18:12,114 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 21:18:12,114 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 21:18:12,115 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 21:18:12,116 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 21:18:12,123 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 21:18:12,125 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 21:18:12,129 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 21:18:12,130 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 21:18:12,132 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 21:18:12,132 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 21:18:12,134 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 21:18:12,136 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 21:18:12,140 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 21:18:12,141 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 21:18:12,141 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 21:18:12,142 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 21:18:12,144 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 21:18:12,144 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 21:18:12,147 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 21:18:12,148 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 21:18:12,149 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 21:18:12,159 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 21:18:12,159 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 21:18:12,159 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 21:18:12,160 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 21:18:12,160 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 21:18:12,161 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 21:18:12,161 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 21:18:12,162 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 21:18:12,162 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 21:18:12,163 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 21:18:12,163 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 21:18:12,163 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 21:18:12,164 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 21:18:12,164 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 21:18:12,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 21:18:12,165 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 21:18:12,165 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 21:18:12,168 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 [2023-03-31 21:18:12,203 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 21:18:12,203 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 21:18:12,203 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 21:18:12,204 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 21:18:12,204 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 21:18:12,204 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 21:18:12,205 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 21:18:12,205 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 21:18:12,205 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 21:18:12,205 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 21:18:12,206 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 21:18:12,206 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 21:18:12,206 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 21:18:12,206 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 21:18:12,206 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 21:18:12,206 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 21:18:12,206 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 21:18:12,207 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 21:18:12,207 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 21:18:12,207 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 21:18:12,207 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 21:18:12,207 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 21:18:12,207 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 21:18:12,208 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 21:18:12,208 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 21:18:12,209 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 21:18:12,209 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:18:12,209 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 21:18:12,209 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 21:18:12,209 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 21:18:12,209 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 21:18:12,209 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 21:18:12,210 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 21:18:12,210 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 21:18:12,210 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 21:18:12,210 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 21:18:12,385 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 21:18:12,408 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 21:18:12,410 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 21:18:12,411 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 21:18:12,412 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 21:18:12,413 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem03_label07.c [2023-03-31 21:18:13,614 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 21:18:13,924 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 21:18:13,924 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label07.c [2023-03-31 21:18:13,939 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5cd5f29a1/488549b06acf4401926a2719a9bbc3d1/FLAG3f9ee3f14 [2023-03-31 21:18:13,958 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5cd5f29a1/488549b06acf4401926a2719a9bbc3d1 [2023-03-31 21:18:13,960 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 21:18:13,961 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 21:18:13,964 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 21:18:13,964 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 21:18:13,967 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 21:18:13,967 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:18:13" (1/1) ... [2023-03-31 21:18:13,968 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74db388 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:13, skipping insertion in model container [2023-03-31 21:18:13,969 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:18:13" (1/1) ... [2023-03-31 21:18:13,975 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 21:18:14,034 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 21:18:14,508 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label07.c[57439,57452] [2023-03-31 21:18:14,537 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:18:14,546 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 21:18:14,706 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label07.c[57439,57452] [2023-03-31 21:18:14,719 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:18:14,736 INFO L208 MainTranslator]: Completed translation [2023-03-31 21:18:14,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14 WrapperNode [2023-03-31 21:18:14,737 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 21:18:14,738 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 21:18:14,738 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 21:18:14,738 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 21:18:14,748 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,748 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,787 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,787 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,841 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,850 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,858 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,867 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,894 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 21:18:14,895 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 21:18:14,895 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 21:18:14,895 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 21:18:14,896 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (1/1) ... [2023-03-31 21:18:14,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:18:14,920 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:18:14,938 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) [2023-03-31 21:18:14,965 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 [2023-03-31 21:18:14,986 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 21:18:14,986 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 21:18:14,986 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 21:18:14,987 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-03-31 21:18:14,987 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 21:18:14,987 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-03-31 21:18:14,987 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 21:18:14,987 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 21:18:14,988 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 21:18:15,098 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 21:18:15,100 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 21:18:16,437 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 21:18:16,702 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 21:18:16,703 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 21:18:16,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:18:16 BoogieIcfgContainer [2023-03-31 21:18:16,706 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 21:18:16,709 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 21:18:16,709 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 21:18:16,712 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 21:18:16,712 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 09:18:13" (1/3) ... [2023-03-31 21:18:16,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20702b77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:18:16, skipping insertion in model container [2023-03-31 21:18:16,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:14" (2/3) ... [2023-03-31 21:18:16,713 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@20702b77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:18:16, skipping insertion in model container [2023-03-31 21:18:16,713 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:18:16" (3/3) ... [2023-03-31 21:18:16,716 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label07.c [2023-03-31 21:18:16,732 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 21:18:16,732 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 21:18:16,786 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 21:18:16,793 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;@649a20ca, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 21:18:16,794 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 21:18:16,800 INFO L276 IsEmpty]: Start isEmpty. Operand has 158 states, 150 states have (on average 1.9466666666666668) internal successors, (292), 151 states have internal predecessors, (292), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 21:18:16,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-03-31 21:18:16,817 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:16,817 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:16,818 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:16,824 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:16,824 INFO L85 PathProgramCache]: Analyzing trace with hash 597536758, now seen corresponding path program 1 times [2023-03-31 21:18:16,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:16,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11703155] [2023-03-31 21:18:16,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:16,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:17,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:17,835 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:17,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:17,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11703155] [2023-03-31 21:18:17,837 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11703155] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:17,837 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:17,838 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 21:18:17,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207541460] [2023-03-31 21:18:17,841 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:17,846 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:18:17,846 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:17,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:18:17,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 21:18:17,884 INFO L87 Difference]: Start difference. First operand has 158 states, 150 states have (on average 1.9466666666666668) internal successors, (292), 151 states have internal predecessors, (292), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 21:18:18,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:18,563 INFO L93 Difference]: Finished difference Result 462 states and 886 transitions. [2023-03-31 21:18:18,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:18:18,565 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 149 [2023-03-31 21:18:18,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:18,576 INFO L225 Difference]: With dead ends: 462 [2023-03-31 21:18:18,576 INFO L226 Difference]: Without dead ends: 301 [2023-03-31 21:18:18,580 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 [2023-03-31 21:18:18,582 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 20 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 490 mSolverCounterSat, 58 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 548 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 58 IncrementalHoareTripleChecker+Valid, 490 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:18,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [20 Valid, 78 Invalid, 548 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [58 Valid, 490 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 21:18:18,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2023-03-31 21:18:18,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2023-03-31 21:18:18,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 293 states have (on average 1.9112627986348123) internal successors, (560), 293 states have internal predecessors, (560), 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) [2023-03-31 21:18:18,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 569 transitions. [2023-03-31 21:18:18,634 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 569 transitions. Word has length 149 [2023-03-31 21:18:18,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:18,634 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 569 transitions. [2023-03-31 21:18:18,635 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 48.333333333333336) internal successors, (145), 2 states have internal predecessors, (145), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-03-31 21:18:18,635 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 569 transitions. [2023-03-31 21:18:18,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2023-03-31 21:18:18,638 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:18,638 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:18,638 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 21:18:18,639 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:18,639 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:18,639 INFO L85 PathProgramCache]: Analyzing trace with hash 316767311, now seen corresponding path program 1 times [2023-03-31 21:18:18,639 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:18,640 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1585756252] [2023-03-31 21:18:18,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:18,640 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:18,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:19,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:19,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:19,179 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1585756252] [2023-03-31 21:18:19,179 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1585756252] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:19,180 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:19,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:18:19,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048293379] [2023-03-31 21:18:19,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:19,183 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:19,183 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:19,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:19,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:18:19,185 INFO L87 Difference]: Start difference. First operand 301 states and 569 transitions. Second operand has 5 states, 5 states have (on average 30.2) internal successors, (151), 4 states have internal predecessors, (151), 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) [2023-03-31 21:18:20,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:20,097 INFO L93 Difference]: Finished difference Result 919 states and 1752 transitions. [2023-03-31 21:18:20,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 21:18:20,099 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 30.2) internal successors, (151), 4 states have internal predecessors, (151), 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 157 [2023-03-31 21:18:20,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:20,103 INFO L225 Difference]: With dead ends: 919 [2023-03-31 21:18:20,103 INFO L226 Difference]: Without dead ends: 623 [2023-03-31 21:18:20,105 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 [2023-03-31 21:18:20,106 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 531 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 531 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 1057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:20,106 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [531 Valid, 46 Invalid, 1057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-03-31 21:18:20,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2023-03-31 21:18:20,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 603. [2023-03-31 21:18:20,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 587 states have (on average 1.7393526405451447) internal successors, (1021), 591 states have internal predecessors, (1021), 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) [2023-03-31 21:18:20,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 1048 transitions. [2023-03-31 21:18:20,140 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 1048 transitions. Word has length 157 [2023-03-31 21:18:20,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:20,141 INFO L495 AbstractCegarLoop]: Abstraction has 603 states and 1048 transitions. [2023-03-31 21:18:20,141 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 30.2) internal successors, (151), 4 states have internal predecessors, (151), 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) [2023-03-31 21:18:20,141 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 1048 transitions. [2023-03-31 21:18:20,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-03-31 21:18:20,144 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:20,144 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:20,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 21:18:20,145 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:20,145 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:20,145 INFO L85 PathProgramCache]: Analyzing trace with hash -848545835, now seen corresponding path program 1 times [2023-03-31 21:18:20,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:20,146 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968450624] [2023-03-31 21:18:20,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:20,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:20,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:20,542 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:20,543 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:20,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968450624] [2023-03-31 21:18:20,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968450624] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:20,543 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:20,543 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:18:20,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013005991] [2023-03-31 21:18:20,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:20,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:20,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:20,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:20,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:18:20,545 INFO L87 Difference]: Start difference. First operand 603 states and 1048 transitions. Second operand has 5 states, 5 states have (on average 31.0) internal successors, (155), 4 states have internal predecessors, (155), 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) [2023-03-31 21:18:21,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:21,414 INFO L93 Difference]: Finished difference Result 1857 states and 3314 transitions. [2023-03-31 21:18:21,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 21:18:21,415 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 31.0) internal successors, (155), 4 states have internal predecessors, (155), 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 161 [2023-03-31 21:18:21,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:21,421 INFO L225 Difference]: With dead ends: 1857 [2023-03-31 21:18:21,421 INFO L226 Difference]: Without dead ends: 1259 [2023-03-31 21:18:21,423 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 [2023-03-31 21:18:21,424 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 494 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 862 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 1118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 862 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:21,425 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [494 Valid, 48 Invalid, 1118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 862 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-03-31 21:18:21,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1259 states. [2023-03-31 21:18:21,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1259 to 1233. [2023-03-31 21:18:21,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1233 states, 1188 states have (on average 1.6902356902356903) internal successors, (2008), 1213 states have internal predecessors, (2008), 10 states have call successors, (10), 10 states have call predecessors, (10), 34 states have return successors, (106), 9 states have call predecessors, (106), 9 states have call successors, (106) [2023-03-31 21:18:21,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1233 states to 1233 states and 2124 transitions. [2023-03-31 21:18:21,471 INFO L78 Accepts]: Start accepts. Automaton has 1233 states and 2124 transitions. Word has length 161 [2023-03-31 21:18:21,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:21,471 INFO L495 AbstractCegarLoop]: Abstraction has 1233 states and 2124 transitions. [2023-03-31 21:18:21,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 31.0) internal successors, (155), 4 states have internal predecessors, (155), 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) [2023-03-31 21:18:21,472 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states and 2124 transitions. [2023-03-31 21:18:21,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2023-03-31 21:18:21,475 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:21,476 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:21,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-03-31 21:18:21,476 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:21,476 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:21,477 INFO L85 PathProgramCache]: Analyzing trace with hash 1089868721, now seen corresponding path program 1 times [2023-03-31 21:18:21,477 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:21,477 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604745050] [2023-03-31 21:18:21,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:21,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:21,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:22,434 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:22,435 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:22,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604745050] [2023-03-31 21:18:22,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604745050] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:22,435 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:22,436 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:18:22,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107188518] [2023-03-31 21:18:22,436 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:22,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:22,436 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:22,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:22,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:18:22,437 INFO L87 Difference]: Start difference. First operand 1233 states and 2124 transitions. Second operand has 5 states, 5 states have (on average 31.4) internal successors, (157), 4 states have internal predecessors, (157), 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) [2023-03-31 21:18:23,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:23,328 INFO L93 Difference]: Finished difference Result 3123 states and 5512 transitions. [2023-03-31 21:18:23,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 21:18:23,329 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 31.4) internal successors, (157), 4 states have internal predecessors, (157), 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 163 [2023-03-31 21:18:23,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:23,338 INFO L225 Difference]: With dead ends: 3123 [2023-03-31 21:18:23,338 INFO L226 Difference]: Without dead ends: 1895 [2023-03-31 21:18:23,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-03-31 21:18:23,342 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 455 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 1081 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 455 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 1181 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 1081 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:23,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [455 Valid, 55 Invalid, 1181 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 1081 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-03-31 21:18:23,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1895 states. [2023-03-31 21:18:23,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1895 to 1863. [2023-03-31 21:18:23,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1863 states, 1789 states have (on average 1.6528787031861376) internal successors, (2957), 1835 states have internal predecessors, (2957), 14 states have call successors, (14), 14 states have call predecessors, (14), 59 states have return successors, (226), 13 states have call predecessors, (226), 13 states have call successors, (226) [2023-03-31 21:18:23,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1863 states to 1863 states and 3197 transitions. [2023-03-31 21:18:23,400 INFO L78 Accepts]: Start accepts. Automaton has 1863 states and 3197 transitions. Word has length 163 [2023-03-31 21:18:23,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:23,400 INFO L495 AbstractCegarLoop]: Abstraction has 1863 states and 3197 transitions. [2023-03-31 21:18:23,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 31.4) internal successors, (157), 4 states have internal predecessors, (157), 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) [2023-03-31 21:18:23,400 INFO L276 IsEmpty]: Start isEmpty. Operand 1863 states and 3197 transitions. [2023-03-31 21:18:23,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2023-03-31 21:18:23,405 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:23,406 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:23,406 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-03-31 21:18:23,406 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:23,406 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:23,406 INFO L85 PathProgramCache]: Analyzing trace with hash 153691224, now seen corresponding path program 1 times [2023-03-31 21:18:23,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:23,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957443614] [2023-03-31 21:18:23,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:23,407 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:23,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:23,727 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:23,727 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:23,727 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957443614] [2023-03-31 21:18:23,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1957443614] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:23,728 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:23,728 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 21:18:23,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190742889] [2023-03-31 21:18:23,728 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:23,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:18:23,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:23,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:18:23,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 21:18:23,730 INFO L87 Difference]: Start difference. First operand 1863 states and 3197 transitions. Second operand has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 3 states have internal predecessors, (164), 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) [2023-03-31 21:18:24,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:24,357 INFO L93 Difference]: Finished difference Result 4331 states and 7685 transitions. [2023-03-31 21:18:24,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:18:24,358 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 3 states have internal predecessors, (164), 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 170 [2023-03-31 21:18:24,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:24,370 INFO L225 Difference]: With dead ends: 4331 [2023-03-31 21:18:24,370 INFO L226 Difference]: Without dead ends: 2473 [2023-03-31 21:18:24,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 21:18:24,374 INFO L413 NwaCegarLoop]: 241 mSDtfsCounter, 34 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 459 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 254 SdHoareTripleChecker+Invalid, 582 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 459 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:24,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 254 Invalid, 582 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 459 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 21:18:24,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2473 states. [2023-03-31 21:18:24,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2473 to 2473. [2023-03-31 21:18:24,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2473 states, 2380 states have (on average 1.6050420168067228) internal successors, (3820), 2437 states have internal predecessors, (3820), 18 states have call successors, (18), 18 states have call predecessors, (18), 74 states have return successors, (364), 17 states have call predecessors, (364), 17 states have call successors, (364) [2023-03-31 21:18:24,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2473 states to 2473 states and 4202 transitions. [2023-03-31 21:18:24,446 INFO L78 Accepts]: Start accepts. Automaton has 2473 states and 4202 transitions. Word has length 170 [2023-03-31 21:18:24,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:24,447 INFO L495 AbstractCegarLoop]: Abstraction has 2473 states and 4202 transitions. [2023-03-31 21:18:24,448 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 54.666666666666664) internal successors, (164), 3 states have internal predecessors, (164), 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) [2023-03-31 21:18:24,448 INFO L276 IsEmpty]: Start isEmpty. Operand 2473 states and 4202 transitions. [2023-03-31 21:18:24,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2023-03-31 21:18:24,454 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:24,454 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:24,455 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-03-31 21:18:24,455 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:24,455 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:24,455 INFO L85 PathProgramCache]: Analyzing trace with hash -747240673, now seen corresponding path program 1 times [2023-03-31 21:18:24,455 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:24,455 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216871853] [2023-03-31 21:18:24,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:24,456 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:24,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:24,875 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 19 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:24,876 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:24,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216871853] [2023-03-31 21:18:24,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216871853] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:24,876 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:24,876 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:18:24,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571357387] [2023-03-31 21:18:24,877 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:24,877 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:24,877 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:24,878 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:24,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:18:24,878 INFO L87 Difference]: Start difference. First operand 2473 states and 4202 transitions. Second operand has 5 states, 5 states have (on average 33.0) internal successors, (165), 4 states have internal predecessors, (165), 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) [2023-03-31 21:18:25,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:25,706 INFO L93 Difference]: Finished difference Result 7581 states and 14032 transitions. [2023-03-31 21:18:25,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 21:18:25,706 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 33.0) internal successors, (165), 4 states have internal predecessors, (165), 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 171 [2023-03-31 21:18:25,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:25,738 INFO L225 Difference]: With dead ends: 7581 [2023-03-31 21:18:25,738 INFO L226 Difference]: Without dead ends: 5113 [2023-03-31 21:18:25,746 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 [2023-03-31 21:18:25,748 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 526 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 948 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 526 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 1073 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 948 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:25,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [526 Valid, 43 Invalid, 1073 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 948 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-03-31 21:18:25,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5113 states. [2023-03-31 21:18:25,956 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5113 to 5001. [2023-03-31 21:18:25,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5001 states, 4788 states have (on average 1.5123224728487887) internal successors, (7241), 4933 states have internal predecessors, (7241), 34 states have call successors, (34), 34 states have call predecessors, (34), 178 states have return successors, (1073), 33 states have call predecessors, (1073), 33 states have call successors, (1073) [2023-03-31 21:18:25,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5001 states to 5001 states and 8348 transitions. [2023-03-31 21:18:25,988 INFO L78 Accepts]: Start accepts. Automaton has 5001 states and 8348 transitions. Word has length 171 [2023-03-31 21:18:25,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:25,989 INFO L495 AbstractCegarLoop]: Abstraction has 5001 states and 8348 transitions. [2023-03-31 21:18:25,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 33.0) internal successors, (165), 4 states have internal predecessors, (165), 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) [2023-03-31 21:18:25,989 INFO L276 IsEmpty]: Start isEmpty. Operand 5001 states and 8348 transitions. [2023-03-31 21:18:26,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2023-03-31 21:18:26,003 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:26,003 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:26,003 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-03-31 21:18:26,003 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:26,004 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:26,004 INFO L85 PathProgramCache]: Analyzing trace with hash -106941621, now seen corresponding path program 1 times [2023-03-31 21:18:26,004 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:26,004 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1374303748] [2023-03-31 21:18:26,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:26,004 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:26,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:26,282 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 49 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:26,283 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:26,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1374303748] [2023-03-31 21:18:26,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1374303748] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:18:26,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161594898] [2023-03-31 21:18:26,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:26,283 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:18:26,283 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:18:26,289 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) [2023-03-31 21:18:26,296 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-03-31 21:18:26,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:26,549 INFO L262 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 8 conjunts are in the unsatisfiable core [2023-03-31 21:18:26,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:18:26,738 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 36 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-03-31 21:18:26,738 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:18:26,739 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161594898] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:26,739 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 21:18:26,739 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-03-31 21:18:26,739 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112454347] [2023-03-31 21:18:26,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:26,739 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:26,740 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:26,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:26,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-03-31 21:18:26,740 INFO L87 Difference]: Start difference. First operand 5001 states and 8348 transitions. Second operand has 5 states, 5 states have (on average 33.4) internal successors, (167), 4 states have internal predecessors, (167), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 21:18:27,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:27,219 INFO L93 Difference]: Finished difference Result 14553 states and 25698 transitions. [2023-03-31 21:18:27,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 21:18:27,220 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 33.4) internal successors, (167), 4 states have internal predecessors, (167), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 188 [2023-03-31 21:18:27,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:27,286 INFO L225 Difference]: With dead ends: 14553 [2023-03-31 21:18:27,286 INFO L226 Difference]: Without dead ends: 9557 [2023-03-31 21:18:27,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 186 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2023-03-31 21:18:27,302 INFO L413 NwaCegarLoop]: 207 mSDtfsCounter, 771 mSDsluCounter, 382 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 771 SdHoareTripleChecker+Valid, 589 SdHoareTripleChecker+Invalid, 326 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:27,303 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [771 Valid, 589 Invalid, 326 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:18:27,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9557 states. [2023-03-31 21:18:27,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9557 to 9419. [2023-03-31 21:18:27,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9419 states, 8999 states have (on average 1.5163907100788976) internal successors, (13646), 9295 states have internal predecessors, (13646), 62 states have call successors, (62), 62 states have call predecessors, (62), 357 states have return successors, (2201), 61 states have call predecessors, (2201), 61 states have call successors, (2201) [2023-03-31 21:18:27,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9419 states to 9419 states and 15909 transitions. [2023-03-31 21:18:27,685 INFO L78 Accepts]: Start accepts. Automaton has 9419 states and 15909 transitions. Word has length 188 [2023-03-31 21:18:27,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:27,686 INFO L495 AbstractCegarLoop]: Abstraction has 9419 states and 15909 transitions. [2023-03-31 21:18:27,686 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 33.4) internal successors, (167), 4 states have internal predecessors, (167), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-03-31 21:18:27,686 INFO L276 IsEmpty]: Start isEmpty. Operand 9419 states and 15909 transitions. [2023-03-31 21:18:27,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2023-03-31 21:18:27,708 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:27,708 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:27,719 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-03-31 21:18:27,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:18:27,916 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:27,916 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:27,916 INFO L85 PathProgramCache]: Analyzing trace with hash -687475174, now seen corresponding path program 1 times [2023-03-31 21:18:27,916 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:27,917 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308517447] [2023-03-31 21:18:27,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:27,917 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:27,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:28,229 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 51 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:28,229 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:28,229 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308517447] [2023-03-31 21:18:28,229 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308517447] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:18:28,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816444187] [2023-03-31 21:18:28,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:28,232 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:18:28,233 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:18:28,237 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) [2023-03-31 21:18:28,256 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-03-31 21:18:28,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:28,475 INFO L262 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 21:18:28,488 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:18:28,578 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 51 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:28,578 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:18:28,713 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 51 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:28,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816444187] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:18:28,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1388264566] [2023-03-31 21:18:28,741 INFO L159 IcfgInterpreter]: Started Sifa with 153 locations of interest [2023-03-31 21:18:28,741 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:18:28,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:18:28,749 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:18:28,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:18:29,498 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 162 for LOIs [2023-03-31 21:18:32,460 INFO L197 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 152 for LOIs