/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 OctagonDomain -i ../sv-benchmarks/c/eca-rers2012/Problem03_label06.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 16:31:09,558 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 16:31:09,559 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 16:31:09,595 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 16:31:09,595 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 16:31:09,597 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 16:31:09,601 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 16:31:09,603 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 16:31:09,604 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 16:31:09,613 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 16:31:09,614 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 16:31:09,616 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 16:31:09,616 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 16:31:09,619 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 16:31:09,620 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 16:31:09,624 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 16:31:09,625 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 16:31:09,626 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 16:31:09,627 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 16:31:09,628 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 16:31:09,629 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 16:31:09,630 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 16:31:09,632 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 16:31:09,633 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 16:31:09,635 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2023-04-02 16:31:09,636 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2023-04-02 16:31:09,636 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2023-04-02 16:31:09,636 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2023-04-02 16:31:09,637 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2023-04-02 16:31:09,637 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2023-04-02 16:31:09,638 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 16:31:09,638 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 16:31:09,639 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 16:31:09,639 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 16:31:09,640 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 16:31:09,640 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 16:31:09,641 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 16:31:09,641 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 16:31:09,641 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 16:31:09,642 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 16:31:09,642 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 16:31:09,644 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-32bit-Taipan_Default.epf [2023-04-02 16:31:09,678 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 16:31:09,679 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 16:31:09,679 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 16:31:09,679 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 16:31:09,680 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 16:31:09,680 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 16:31:09,680 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 16:31:09,680 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 16:31:09,680 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 16:31:09,680 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 16:31:09,680 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 16:31:09,680 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 16:31:09,681 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 16:31:09,681 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 16:31:09,681 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 16:31:09,681 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 16:31:09,681 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 16:31:09,681 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 16:31:09,682 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 16:31:09,682 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 16:31:09,683 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 16:31:09,683 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 16:31:09,683 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 16:31:09,683 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 16:31:09,683 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 16:31:09,683 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 16:31:09,683 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 16:31:09,683 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 16:31:09,684 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 16:31:09,684 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 16:31:09,684 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 16:31:09,684 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 16:31:09,684 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 16:31:09,684 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 16:31:09,684 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 16:31:09,921 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 16:31:09,952 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 16:31:09,954 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 16:31:09,956 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 16:31:09,957 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 16:31:09,958 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem03_label06.c [2023-04-02 16:31:11,125 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 16:31:11,480 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 16:31:11,481 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem03_label06.c [2023-04-02 16:31:11,499 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/78dac0251/e5c1910390ba4bf181f1e5fd08f91cf6/FLAG04bf6b61e [2023-04-02 16:31:11,515 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/78dac0251/e5c1910390ba4bf181f1e5fd08f91cf6 [2023-04-02 16:31:11,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 16:31:11,518 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 16:31:11,519 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 16:31:11,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 16:31:11,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 16:31:11,522 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 04:31:11" (1/1) ... [2023-04-02 16:31:11,523 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@628dd1c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:11, skipping insertion in model container [2023-04-02 16:31:11,523 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 04:31:11" (1/1) ... [2023-04-02 16:31:11,530 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 16:31:11,616 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 16:31:12,128 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] [2023-04-02 16:31:12,164 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 16:31:12,174 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 16:31:12,416 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] [2023-04-02 16:31:12,429 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 16:31:12,445 INFO L208 MainTranslator]: Completed translation [2023-04-02 16:31:12,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12 WrapperNode [2023-04-02 16:31:12,446 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 16:31:12,448 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 16:31:12,448 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 16:31:12,448 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 16:31:12,458 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,459 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,500 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,500 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,568 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,587 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,603 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,611 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,625 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 16:31:12,626 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 16:31:12,627 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 16:31:12,627 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 16:31:12,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (1/1) ... [2023-04-02 16:31:12,635 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 16:31:12,645 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:31:12,662 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-04-02 16:31:12,686 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-04-02 16:31:12,702 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 16:31:12,703 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 16:31:12,703 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 16:31:12,703 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-04-02 16:31:12,703 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 16:31:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-04-02 16:31:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 16:31:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 16:31:12,703 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 16:31:12,704 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 16:31:12,705 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 16:31:12,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 16:31:12,818 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 16:31:12,820 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 16:31:14,236 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 16:31:14,576 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 16:31:14,577 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-04-02 16:31:14,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 04:31:14 BoogieIcfgContainer [2023-04-02 16:31:14,580 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 16:31:14,582 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 16:31:14,582 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 16:31:14,585 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 16:31:14,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 04:31:11" (1/3) ... [2023-04-02 16:31:14,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@155e8fc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 04:31:14, skipping insertion in model container [2023-04-02 16:31:14,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 04:31:12" (2/3) ... [2023-04-02 16:31:14,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@155e8fc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 04:31:14, skipping insertion in model container [2023-04-02 16:31:14,586 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 04:31:14" (3/3) ... [2023-04-02 16:31:14,589 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem03_label06.c [2023-04-02 16:31:14,605 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 16:31:14,605 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 16:31:14,659 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 16:31:14,665 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;@4ed94d24, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 16:31:14,666 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 16:31:14,672 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) [2023-04-02 16:31:14,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2023-04-02 16:31:14,688 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:31:14,689 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] [2023-04-02 16:31:14,690 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:31:14,696 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:31:14,697 INFO L85 PathProgramCache]: Analyzing trace with hash 597533107, now seen corresponding path program 1 times [2023-04-02 16:31:14,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:31:14,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034934336] [2023-04-02 16:31:14,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:14,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:31:14,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:15,707 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:31:15,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:31:15,708 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034934336] [2023-04-02 16:31:15,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034934336] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:31:15,709 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:31:15,709 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 16:31:15,711 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731866236] [2023-04-02 16:31:15,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:31:15,717 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 16:31:15,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:31:15,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 16:31:15,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 16:31:15,756 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) [2023-04-02 16:31:16,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:31:16,623 INFO L93 Difference]: Finished difference Result 462 states and 886 transitions. [2023-04-02 16:31:16,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 16:31:16,628 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 [2023-04-02 16:31:16,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:31:16,643 INFO L225 Difference]: With dead ends: 462 [2023-04-02 16:31:16,643 INFO L226 Difference]: Without dead ends: 301 [2023-04-02 16:31:16,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 16:31:16,652 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 43 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 506 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.8s IncrementalHoareTripleChecker+Time [2023-04-02 16:31:16,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 68 Invalid, 576 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 506 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-02 16:31:16,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2023-04-02 16:31:16,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 301. [2023-04-02 16:31:16,737 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) [2023-04-02 16:31:16,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 534 transitions. [2023-04-02 16:31:16,741 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 534 transitions. Word has length 149 [2023-04-02 16:31:16,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:31:16,745 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 534 transitions. [2023-04-02 16:31:16,746 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) [2023-04-02 16:31:16,746 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 534 transitions. [2023-04-02 16:31:16,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2023-04-02 16:31:16,784 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:31:16,784 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] [2023-04-02 16:31:16,784 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 16:31:16,785 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:31:16,785 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:31:16,786 INFO L85 PathProgramCache]: Analyzing trace with hash 15707757, now seen corresponding path program 1 times [2023-04-02 16:31:16,786 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:31:16,786 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940219024] [2023-04-02 16:31:16,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:16,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:31:16,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:17,332 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:31:17,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:31:17,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940219024] [2023-04-02 16:31:17,334 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940219024] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:31:17,334 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:31:17,334 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:31:17,334 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838172538] [2023-04-02 16:31:17,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:31:17,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:31:17,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:31:17,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:31:17,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:31:17,338 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) [2023-04-02 16:31:17,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:31:17,762 INFO L93 Difference]: Finished difference Result 913 states and 1633 transitions. [2023-04-02 16:31:17,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 16:31:17,763 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 [2023-04-02 16:31:17,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:31:17,770 INFO L225 Difference]: With dead ends: 913 [2023-04-02 16:31:17,770 INFO L226 Difference]: Without dead ends: 617 [2023-04-02 16:31:17,777 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 [2023-04-02 16:31:17,780 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 774 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s 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, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 16:31:17,781 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [774 Valid, 528 Invalid, 436 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 16:31:17,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2023-04-02 16:31:17,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 605. [2023-04-02 16:31:17,822 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) [2023-04-02 16:31:17,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 1074 transitions. [2023-04-02 16:31:17,828 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 1074 transitions. Word has length 158 [2023-04-02 16:31:17,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:31:17,833 INFO L495 AbstractCegarLoop]: Abstraction has 605 states and 1074 transitions. [2023-04-02 16:31:17,833 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) [2023-04-02 16:31:17,833 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 1074 transitions. [2023-04-02 16:31:17,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2023-04-02 16:31:17,839 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:31:17,839 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] [2023-04-02 16:31:17,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-04-02 16:31:17,839 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:31:17,840 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:31:17,840 INFO L85 PathProgramCache]: Analyzing trace with hash -848549486, now seen corresponding path program 1 times [2023-04-02 16:31:17,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:31:17,840 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112345154] [2023-04-02 16:31:17,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:17,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:31:17,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:18,275 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:31:18,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:31:18,276 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112345154] [2023-04-02 16:31:18,276 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112345154] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:31:18,277 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 16:31:18,277 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-04-02 16:31:18,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437020397] [2023-04-02 16:31:18,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:31:18,278 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:31:18,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:31:18,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:31:18,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-04-02 16:31:18,279 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) [2023-04-02 16:31:19,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:31:19,159 INFO L93 Difference]: Finished difference Result 1861 states and 3379 transitions. [2023-04-02 16:31:19,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-04-02 16:31:19,160 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 [2023-04-02 16:31:19,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:31:19,167 INFO L225 Difference]: With dead ends: 1861 [2023-04-02 16:31:19,167 INFO L226 Difference]: Without dead ends: 1261 [2023-04-02 16:31:19,168 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-04-02 16:31:19,169 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 491 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 872 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s 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, 0.8s IncrementalHoareTripleChecker+Time [2023-04-02 16:31:19,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [491 Valid, 44 Invalid, 1128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 872 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-02 16:31:19,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1261 states. [2023-04-02 16:31:19,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1261 to 1233. [2023-04-02 16:31:19,205 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) [2023-04-02 16:31:19,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1233 states to 1233 states and 2152 transitions. [2023-04-02 16:31:19,210 INFO L78 Accepts]: Start accepts. Automaton has 1233 states and 2152 transitions. Word has length 161 [2023-04-02 16:31:19,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:31:19,210 INFO L495 AbstractCegarLoop]: Abstraction has 1233 states and 2152 transitions. [2023-04-02 16:31:19,211 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) [2023-04-02 16:31:19,211 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states and 2152 transitions. [2023-04-02 16:31:19,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2023-04-02 16:31:19,215 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:31:19,216 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] [2023-04-02 16:31:19,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-04-02 16:31:19,216 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:31:19,216 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:31:19,216 INFO L85 PathProgramCache]: Analyzing trace with hash 555685507, now seen corresponding path program 1 times [2023-04-02 16:31:19,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:31:19,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786197097] [2023-04-02 16:31:19,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:19,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:31:19,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:19,561 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-04-02 16:31:19,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:31:19,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786197097] [2023-04-02 16:31:19,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786197097] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 16:31:19,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666401151] [2023-04-02 16:31:19,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:19,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:31:19,562 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:31:19,569 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 16:31:19,574 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-04-02 16:31:19,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:19,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 16:31:19,871 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 16:31:19,977 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-04-02 16:31:19,977 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-04-02 16:31:19,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666401151] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 16:31:19,978 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-04-02 16:31:19,978 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-04-02 16:31:19,978 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871814881] [2023-04-02 16:31:19,978 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 16:31:19,979 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-04-02 16:31:19,979 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 16:31:19,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-04-02 16:31:19,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2023-04-02 16:31:19,980 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) [2023-04-02 16:31:20,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 16:31:20,863 INFO L93 Difference]: Finished difference Result 3789 states and 6882 transitions. [2023-04-02 16:31:20,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-04-02 16:31:20,864 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 [2023-04-02 16:31:20,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 16:31:20,878 INFO L225 Difference]: With dead ends: 3789 [2023-04-02 16:31:20,878 INFO L226 Difference]: Without dead ends: 2561 [2023-04-02 16:31:20,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-04-02 16:31:20,883 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 509 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s 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, 0.8s IncrementalHoareTripleChecker+Time [2023-04-02 16:31:20,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [509 Valid, 38 Invalid, 1082 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-04-02 16:31:20,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2561 states. [2023-04-02 16:31:20,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2561 to 2539. [2023-04-02 16:31:20,949 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) [2023-04-02 16:31:20,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2539 states to 2539 states and 4272 transitions. [2023-04-02 16:31:20,960 INFO L78 Accepts]: Start accepts. Automaton has 2539 states and 4272 transitions. Word has length 175 [2023-04-02 16:31:20,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 16:31:20,961 INFO L495 AbstractCegarLoop]: Abstraction has 2539 states and 4272 transitions. [2023-04-02 16:31:20,961 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) [2023-04-02 16:31:20,961 INFO L276 IsEmpty]: Start isEmpty. Operand 2539 states and 4272 transitions. [2023-04-02 16:31:20,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2023-04-02 16:31:20,969 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 16:31:20,969 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] [2023-04-02 16:31:20,977 INFO L552 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-04-02 16:31:21,177 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 [2023-04-02 16:31:21,178 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 16:31:21,178 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 16:31:21,178 INFO L85 PathProgramCache]: Analyzing trace with hash -1395160217, now seen corresponding path program 1 times [2023-04-02 16:31:21,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 16:31:21,180 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789852200] [2023-04-02 16:31:21,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:21,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 16:31:21,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:21,565 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:31:21,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 16:31:21,567 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789852200] [2023-04-02 16:31:21,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789852200] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 16:31:21,568 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2032919035] [2023-04-02 16:31:21,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 16:31:21,568 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 16:31:21,569 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 16:31:21,573 INFO L229 MonitoredProcess]: Starting monitored process 3 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 16:31:21,576 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-04-02 16:31:21,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 16:31:21,818 INFO L262 TraceCheckSpWp]: Trace formula consists of 1044 conjuncts, 4 conjunts are in the unsatisfiable core [2023-04-02 16:31:21,823 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 16:31:21,875 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:31:21,875 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 16:31:21,964 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 35 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-04-02 16:31:21,964 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2032919035] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 16:31:21,964 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1325481578] [2023-04-02 16:31:21,987 INFO L159 IcfgInterpreter]: Started Sifa with 153 locations of interest [2023-04-02 16:31:21,987 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 16:31:21,990 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 16:31:21,994 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 16:31:21,995 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 16:31:22,854 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 162 for LOIs [2023-04-02 16:31:31,995 WARN L223 SmtUtils]: Spent 7.79s on a formula simplification that was a NOOP. DAG size: 962 (called from [L 212] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.BasicPredicateFactory.xJunctTerm) [2023-04-02 16:32:15,976 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 24864 conjuctions. This might take some time... [2023-04-02 16:32:46,180 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 24864 conjuctions.