/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_label06.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 21:17:58,724 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 21:17:58,725 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 21:17:58,744 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 21:17:58,745 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 21:17:58,745 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 21:17:58,746 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 21:17:58,747 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 21:17:58,750 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 21:17:58,751 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 21:17:58,751 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 21:17:58,752 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 21:17:58,752 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 21:17:58,753 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 21:17:58,753 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 21:17:58,754 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 21:17:58,755 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 21:17:58,755 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 21:17:58,756 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 21:17:58,758 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 21:17:58,759 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 21:17:58,768 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 21:17:58,770 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 21:17:58,771 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 21:17:58,778 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-03-31 21:17:58,778 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-03-31 21:17:58,778 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-03-31 21:17:58,778 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-03-31 21:17:58,779 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-03-31 21:17:58,779 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-03-31 21:17:58,779 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 21:17:58,780 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 21:17:58,780 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 21:17:58,784 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 21:17:58,785 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 21:17:58,785 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 21:17:58,786 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 21:17:58,786 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 21:17:58,786 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 21:17:58,788 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 21:17:58,788 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 21:17:58,789 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 21:17:58,807 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 21:17:58,808 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 21:17:58,808 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 21:17:58,808 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 21:17:58,809 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 21:17:58,809 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 21:17:58,809 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 21:17:58,809 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 21:17:58,809 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 21:17:58,809 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 21:17:58,810 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 21:17:58,810 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 21:17:58,810 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 21:17:58,810 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 21:17:58,810 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 21:17:58,810 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 21:17:58,810 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 21:17:58,811 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 21:17:58,811 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 21:17:58,812 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 21:17:58,812 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 21:17:58,812 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 21:17:58,812 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 21:17:58,812 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 21:17:58,812 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:17:58,813 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 21:17:58,813 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 21:17:58,814 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 21:17:58,814 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 21:17:58,973 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 21:17:58,991 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 21:17:58,993 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 21:17:58,994 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 21:17:58,995 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 21:17:58,996 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem03_label06.c [2023-03-31 21:17:59,962 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 21:18:00,222 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 21:18:00,222 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label06.c [2023-03-31 21:18:00,239 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49694db53/2da5f7d822e34125946bd7bcce00a509/FLAGe2581d545 [2023-03-31 21:18:00,253 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/49694db53/2da5f7d822e34125946bd7bcce00a509 [2023-03-31 21:18:00,255 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 21:18:00,256 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 21:18:00,259 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 21:18:00,259 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 21:18:00,262 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 21:18:00,262 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:00,263 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ca8cfcc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00, skipping insertion in model container [2023-03-31 21:18:00,263 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:00,268 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 21:18:00,335 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 21:18:00,730 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_label06.c[57034,57047] [2023-03-31 21:18:00,764 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:18:00,772 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 21:18:00,963 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_label06.c[57034,57047] [2023-03-31 21:18:00,980 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 21:18:00,993 INFO L208 MainTranslator]: Completed translation [2023-03-31 21:18:00,993 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00 WrapperNode [2023-03-31 21:18:00,993 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 21:18:00,994 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 21:18:00,994 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 21:18:00,994 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 21:18:01,002 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,002 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,028 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,028 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,070 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,086 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,091 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,096 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,104 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 21:18:01,105 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 21:18:01,105 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 21:18:01,105 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 21:18:01,106 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (1/1) ... [2023-03-31 21:18:01,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 21:18:01,128 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:18:01,137 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 21:18:01,151 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 21:18:01,162 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 21:18:01,162 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 21:18:01,162 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 21:18:01,162 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-03-31 21:18:01,162 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 21:18:01,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 21:18:01,261 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 21:18:01,263 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 21:18:02,468 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 21:18:02,689 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 21:18:02,689 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 21:18:02,692 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:18:02 BoogieIcfgContainer [2023-03-31 21:18:02,692 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 21:18:02,694 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 21:18:02,694 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 21:18:02,696 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 21:18:02,696 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 09:18:00" (1/3) ... [2023-03-31 21:18:02,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228bc50f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:18:02, skipping insertion in model container [2023-03-31 21:18:02,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 09:18:00" (2/3) ... [2023-03-31 21:18:02,697 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@228bc50f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 09:18:02, skipping insertion in model container [2023-03-31 21:18:02,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 09:18:02" (3/3) ... [2023-03-31 21:18:02,699 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label06.c [2023-03-31 21:18:02,710 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 21:18:02,710 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 21:18:02,752 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 21:18:02,758 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;@7a749019, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 21:18:02,758 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 21:18:02,763 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 21:18:02,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-03-31 21:18:02,775 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:02,776 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 21:18:02,777 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:02,781 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:02,781 INFO L85 PathProgramCache]: Analyzing trace with hash 597533107, now seen corresponding path program 1 times [2023-03-31 21:18:02,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:02,788 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899110240] [2023-03-31 21:18:02,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:02,789 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:03,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:03,642 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 21:18:03,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:03,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899110240] [2023-03-31 21:18:03,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899110240] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:03,643 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:03,643 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 21:18:03,645 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976199291] [2023-03-31 21:18:03,645 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:03,650 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 21:18:03,650 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:03,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 21:18:03,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 21:18:03,680 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 21:18:04,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:04,337 INFO L93 Difference]: Finished difference Result 462 states and 886 transitions. [2023-03-31 21:18:04,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 21:18:04,339 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 21:18:04,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:04,356 INFO L225 Difference]: With dead ends: 462 [2023-03-31 21:18:04,356 INFO L226 Difference]: Without dead ends: 301 [2023-03-31 21:18:04,370 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 21:18:04,373 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 43 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 576 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 506 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:04,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 68 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 506 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 21:18:04,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2023-03-31 21:18:04,427 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2023-03-31 21:18:04,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 293 states have (on average 1.7918088737201365) internal successors, (525), 293 states have internal predecessors, (525), 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 21:18:04,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 534 transitions. [2023-03-31 21:18:04,430 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 534 transitions. Word has length 149 [2023-03-31 21:18:04,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:04,433 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 534 transitions. [2023-03-31 21:18:04,433 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 21:18:04,434 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 534 transitions. [2023-03-31 21:18:04,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-03-31 21:18:04,442 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:04,443 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 21:18:04,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 21:18:04,443 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:04,443 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:04,443 INFO L85 PathProgramCache]: Analyzing trace with hash 15707757, now seen corresponding path program 1 times [2023-03-31 21:18:04,444 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:04,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510147651] [2023-03-31 21:18:04,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:04,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:04,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:04,768 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:04,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:04,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510147651] [2023-03-31 21:18:04,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510147651] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:04,768 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:04,768 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:18:04,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000823795] [2023-03-31 21:18:04,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:04,778 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:04,778 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:04,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:04,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:18:04,780 INFO L87 Difference]: Start difference. First operand 301 states and 534 transitions. Second operand has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:18:05,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:05,104 INFO L93 Difference]: Finished difference Result 913 states and 1633 transitions. [2023-03-31 21:18:05,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-03-31 21:18:05,105 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 158 [2023-03-31 21:18:05,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:05,108 INFO L225 Difference]: With dead ends: 913 [2023-03-31 21:18:05,108 INFO L226 Difference]: Without dead ends: 617 [2023-03-31 21:18:05,110 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 21:18:05,110 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 774 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 774 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 436 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:05,111 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [774 Valid, 528 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-03-31 21:18:05,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2023-03-31 21:18:05,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 605. [2023-03-31 21:18:05,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 605 states, 588 states have (on average 1.7789115646258504) internal successors, (1046), 593 states have internal predecessors, (1046), 6 states have call successors, (6), 6 states have call predecessors, (6), 10 states have return successors, (22), 5 states have call predecessors, (22), 5 states have call successors, (22) [2023-03-31 21:18:05,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 1074 transitions. [2023-03-31 21:18:05,135 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 1074 transitions. Word has length 158 [2023-03-31 21:18:05,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:05,135 INFO L495 AbstractCegarLoop]: Abstraction has 605 states and 1074 transitions. [2023-03-31 21:18:05,135 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 30.4) internal successors, (152), 4 states have internal predecessors, (152), 3 states have call successors, (4), 4 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-03-31 21:18:05,135 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 1074 transitions. [2023-03-31 21:18:05,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-03-31 21:18:05,137 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:05,137 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 21:18:05,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 21:18:05,137 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:05,138 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:05,138 INFO L85 PathProgramCache]: Analyzing trace with hash -848549486, now seen corresponding path program 1 times [2023-03-31 21:18:05,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:05,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036562784] [2023-03-31 21:18:05,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:05,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:05,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:05,400 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 21:18:05,400 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:05,400 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036562784] [2023-03-31 21:18:05,400 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1036562784] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:05,400 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 21:18:05,400 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 21:18:05,401 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [147868451] [2023-03-31 21:18:05,401 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:05,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:05,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:05,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:05,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 21:18:05,402 INFO L87 Difference]: Start difference. First operand 605 states and 1074 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 21:18:06,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:06,079 INFO L93 Difference]: Finished difference Result 1861 states and 3379 transitions. [2023-03-31 21:18:06,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 21:18:06,080 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 21:18:06,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:06,085 INFO L225 Difference]: With dead ends: 1861 [2023-03-31 21:18:06,085 INFO L226 Difference]: Without dead ends: 1261 [2023-03-31 21:18:06,086 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 21:18:06,087 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 491 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 491 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 1128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 872 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:06,087 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [491 Valid, 44 Invalid, 1128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-03-31 21:18:06,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1261 states. [2023-03-31 21:18:06,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1261 to 1233. [2023-03-31 21:18:06,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1233 states, 1188 states have (on average 1.7171717171717171) internal successors, (2040), 1213 states have internal predecessors, (2040), 10 states have call successors, (10), 10 states have call predecessors, (10), 34 states have return successors, (102), 9 states have call predecessors, (102), 9 states have call successors, (102) [2023-03-31 21:18:06,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1233 states to 1233 states and 2152 transitions. [2023-03-31 21:18:06,111 INFO L78 Accepts]: Start accepts. Automaton has 1233 states and 2152 transitions. Word has length 161 [2023-03-31 21:18:06,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:06,112 INFO L495 AbstractCegarLoop]: Abstraction has 1233 states and 2152 transitions. [2023-03-31 21:18:06,112 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 21:18:06,112 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states and 2152 transitions. [2023-03-31 21:18:06,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2023-03-31 21:18:06,115 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:06,115 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 1, 1] [2023-03-31 21:18:06,115 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-03-31 21:18:06,115 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:06,116 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:06,116 INFO L85 PathProgramCache]: Analyzing trace with hash 555685507, now seen corresponding path program 1 times [2023-03-31 21:18:06,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:06,116 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870590981] [2023-03-31 21:18:06,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:06,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:06,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:06,403 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 21:18:06,403 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:06,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870590981] [2023-03-31 21:18:06,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870590981] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:18:06,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764269187] [2023-03-31 21:18:06,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:06,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:18:06,405 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:18:06,407 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 21:18:06,408 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 21:18:06,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:06,617 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 21:18:06,629 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:18:06,750 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-03-31 21:18:06,750 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 21:18:06,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764269187] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 21:18:06,751 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 21:18:06,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-03-31 21:18:06,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766189718] [2023-03-31 21:18:06,751 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 21:18:06,752 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 21:18:06,752 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 21:18:06,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 21:18:06,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-03-31 21:18:06,753 INFO L87 Difference]: Start difference. First operand 1233 states and 2152 transitions. Second operand has 5 states, 5 states have (on average 32.4) internal successors, (162), 4 states have internal predecessors, (162), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 21:18:07,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 21:18:07,505 INFO L93 Difference]: Finished difference Result 3789 states and 6882 transitions. [2023-03-31 21:18:07,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 21:18:07,507 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 32.4) internal successors, (162), 4 states have internal predecessors, (162), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) Word has length 175 [2023-03-31 21:18:07,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 21:18:07,520 INFO L225 Difference]: With dead ends: 3789 [2023-03-31 21:18:07,521 INFO L226 Difference]: Without dead ends: 2561 [2023-03-31 21:18:07,523 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-03-31 21:18:07,529 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 509 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 509 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 1082 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-03-31 21:18:07,530 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [509 Valid, 38 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-03-31 21:18:07,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2561 states. [2023-03-31 21:18:07,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2561 to 2539. [2023-03-31 21:18:07,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2539 states, 2413 states have (on average 1.5893079154579361) internal successors, (3835), 2503 states have internal predecessors, (3835), 18 states have call successors, (18), 18 states have call predecessors, (18), 107 states have return successors, (419), 17 states have call predecessors, (419), 17 states have call successors, (419) [2023-03-31 21:18:07,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2539 states to 2539 states and 4272 transitions. [2023-03-31 21:18:07,605 INFO L78 Accepts]: Start accepts. Automaton has 2539 states and 4272 transitions. Word has length 175 [2023-03-31 21:18:07,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 21:18:07,605 INFO L495 AbstractCegarLoop]: Abstraction has 2539 states and 4272 transitions. [2023-03-31 21:18:07,606 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 32.4) internal successors, (162), 4 states have internal predecessors, (162), 3 states have call successors, (4), 4 states have call predecessors, (4), 3 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-03-31 21:18:07,606 INFO L276 IsEmpty]: Start isEmpty. Operand 2539 states and 4272 transitions. [2023-03-31 21:18:07,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2023-03-31 21:18:07,611 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 21:18:07,612 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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] [2023-03-31 21:18:07,621 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 21:18:07,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:18:07,821 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 21:18:07,821 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 21:18:07,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1395160217, now seen corresponding path program 1 times [2023-03-31 21:18:07,821 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 21:18:07,821 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536233910] [2023-03-31 21:18:07,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:07,822 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 21:18:07,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:08,024 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:08,025 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 21:18:08,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536233910] [2023-03-31 21:18:08,025 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536233910] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 21:18:08,025 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1391621229] [2023-03-31 21:18:08,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 21:18:08,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 21:18:08,025 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 21:18:08,026 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 21:18:08,029 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 21:18:08,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 21:18:08,227 INFO L262 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 21:18:08,231 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 21:18:08,285 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:08,286 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 21:18:08,374 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 21:18:08,374 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1391621229] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 21:18:08,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [574256159] [2023-03-31 21:18:08,398 INFO L159 IcfgInterpreter]: Started Sifa with 153 locations of interest [2023-03-31 21:18:08,398 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 21:18:08,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 21:18:08,404 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 21:18:08,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 21:18:08,936 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 162 for LOIs [2023-03-31 21:18:10,926 INFO L197 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 148 for LOIs