/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/Problem18_label16.c -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-03-31 22:25:40,976 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-03-31 22:25:40,978 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-03-31 22:25:41,008 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-03-31 22:25:41,009 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-03-31 22:25:41,011 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-03-31 22:25:41,015 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-03-31 22:25:41,016 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-03-31 22:25:41,017 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-03-31 22:25:41,020 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-03-31 22:25:41,021 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-03-31 22:25:41,022 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-03-31 22:25:41,022 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-03-31 22:25:41,022 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-03-31 22:25:41,023 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-03-31 22:25:41,023 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-03-31 22:25:41,024 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-03-31 22:25:41,024 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-03-31 22:25:41,025 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-03-31 22:25:41,026 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-03-31 22:25:41,026 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-03-31 22:25:41,029 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-03-31 22:25:41,030 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-03-31 22:25:41,031 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-03-31 22:25:41,040 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-03-31 22:25:41,041 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-03-31 22:25:41,042 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-03-31 22:25:41,042 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-03-31 22:25:41,042 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-03-31 22:25:41,043 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-03-31 22:25:41,043 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-03-31 22:25:41,043 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-03-31 22:25:41,044 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-03-31 22:25:41,044 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-03-31 22:25:41,044 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-03-31 22:25:41,045 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-03-31 22:25:41,047 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 22:25:41,069 INFO L113 SettingsManager]: Loading preferences was successful [2023-03-31 22:25:41,069 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-03-31 22:25:41,070 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-03-31 22:25:41,070 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-03-31 22:25:41,070 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-03-31 22:25:41,070 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-03-31 22:25:41,071 INFO L138 SettingsManager]: * User list type=DISABLED [2023-03-31 22:25:41,071 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-03-31 22:25:41,071 INFO L138 SettingsManager]: * Explicit value domain=true [2023-03-31 22:25:41,071 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-03-31 22:25:41,071 INFO L138 SettingsManager]: * Octagon Domain=false [2023-03-31 22:25:41,071 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-03-31 22:25:41,072 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-03-31 22:25:41,072 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-03-31 22:25:41,072 INFO L138 SettingsManager]: * Interval Domain=false [2023-03-31 22:25:41,072 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-03-31 22:25:41,072 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-03-31 22:25:41,072 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-03-31 22:25:41,073 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * sizeof long=4 [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * sizeof long double=12 [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Use constant arrays=true [2023-03-31 22:25:41,073 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-03-31 22:25:41,074 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:25:41,074 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-03-31 22:25:41,074 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-03-31 22:25:41,075 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-03-31 22:25:41,075 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-03-31 22:25:41,075 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> IntervalDomain [2023-03-31 22:25:41,261 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-03-31 22:25:41,280 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-03-31 22:25:41,281 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-03-31 22:25:41,282 INFO L271 PluginConnector]: Initializing CDTParser... [2023-03-31 22:25:41,283 INFO L275 PluginConnector]: CDTParser initialized [2023-03-31 22:25:41,283 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/eca-rers2012/Problem18_label16.c [2023-03-31 22:25:42,334 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-03-31 22:25:42,668 INFO L351 CDTParser]: Found 1 translation units. [2023-03-31 22:25:42,669 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/eca-rers2012/Problem18_label16.c [2023-03-31 22:25:42,685 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/873eb970f/952fa27766c2440aa92c3ae838bd3558/FLAG1a31e8ea8 [2023-03-31 22:25:42,699 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/873eb970f/952fa27766c2440aa92c3ae838bd3558 [2023-03-31 22:25:42,701 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-03-31 22:25:42,702 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-03-31 22:25:42,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-03-31 22:25:42,704 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-03-31 22:25:42,706 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-03-31 22:25:42,707 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:25:42" (1/1) ... [2023-03-31 22:25:42,708 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@689d3b69 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:42, skipping insertion in model container [2023-03-31 22:25:42,708 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 31.03 10:25:42" (1/1) ... [2023-03-31 22:25:42,713 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-03-31 22:25:42,777 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-03-31 22:25:42,894 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/Problem18_label16.c[4934,4947] [2023-03-31 22:25:43,370 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:25:43,379 INFO L203 MainTranslator]: Completed pre-run [2023-03-31 22:25:43,400 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/Problem18_label16.c[4934,4947] [2023-03-31 22:25:43,601 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-03-31 22:25:43,617 INFO L208 MainTranslator]: Completed translation [2023-03-31 22:25:43,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43 WrapperNode [2023-03-31 22:25:43,618 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-03-31 22:25:43,619 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-03-31 22:25:43,619 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-03-31 22:25:43,619 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-03-31 22:25:43,627 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,627 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,667 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,667 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,717 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,741 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,754 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,763 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,777 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-03-31 22:25:43,778 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-03-31 22:25:43,778 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-03-31 22:25:43,778 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-03-31 22:25:43,779 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (1/1) ... [2023-03-31 22:25:43,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-03-31 22:25:43,792 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:25:43,818 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 22:25:43,834 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 22:25:43,846 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-03-31 22:25:43,849 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-03-31 22:25:43,849 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-03-31 22:25:43,849 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2023-03-31 22:25:43,849 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output2 [2023-03-31 22:25:43,849 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output3 [2023-03-31 22:25:43,849 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-03-31 22:25:43,849 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output2 [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output3 [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-03-31 22:25:43,850 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-03-31 22:25:43,965 INFO L236 CfgBuilder]: Building ICFG [2023-03-31 22:25:43,967 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-03-31 22:25:45,939 INFO L277 CfgBuilder]: Performing block encoding [2023-03-31 22:25:51,753 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-03-31 22:25:51,754 INFO L302 CfgBuilder]: Removed 1 assume(true) statements. [2023-03-31 22:25:51,756 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:25:51 BoogieIcfgContainer [2023-03-31 22:25:51,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-03-31 22:25:51,758 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-03-31 22:25:51,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-03-31 22:25:51,760 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-03-31 22:25:51,760 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 31.03 10:25:42" (1/3) ... [2023-03-31 22:25:51,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47aad7dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:25:51, skipping insertion in model container [2023-03-31 22:25:51,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 31.03 10:25:43" (2/3) ... [2023-03-31 22:25:51,761 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47aad7dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 31.03 10:25:51, skipping insertion in model container [2023-03-31 22:25:51,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 31.03 10:25:51" (3/3) ... [2023-03-31 22:25:51,762 INFO L112 eAbstractionObserver]: Analyzing ICFG Problem18_label16.c [2023-03-31 22:25:51,791 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-03-31 22:25:51,792 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-03-31 22:25:51,859 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-03-31 22:25:51,864 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;@645150d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-03-31 22:25:51,864 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-03-31 22:25:51,872 INFO L276 IsEmpty]: Start isEmpty. Operand has 469 states, 457 states have (on average 1.9715536105032823) internal successors, (901), 458 states have internal predecessors, (901), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-03-31 22:25:51,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-03-31 22:25:51,878 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:25:51,878 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:25:51,879 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:25:51,882 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:25:51,882 INFO L85 PathProgramCache]: Analyzing trace with hash 314233347, now seen corresponding path program 1 times [2023-03-31 22:25:51,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:25:51,889 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639369089] [2023-03-31 22:25:51,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:25:51,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:25:51,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:25:52,097 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 22:25:52,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:25:52,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639369089] [2023-03-31 22:25:52,098 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639369089] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:25:52,098 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:25:52,098 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-03-31 22:25:52,099 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010675080] [2023-03-31 22:25:52,100 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:25:52,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-03-31 22:25:52,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:25:52,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-03-31 22:25:52,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-03-31 22:25:52,123 INFO L87 Difference]: Start difference. First operand has 469 states, 457 states have (on average 1.9715536105032823) internal successors, (901), 458 states have internal predecessors, (901), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 22:25:53,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:25:53,834 INFO L93 Difference]: Finished difference Result 1393 states and 2727 transitions. [2023-03-31 22:25:53,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-03-31 22:25:53,836 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 11 [2023-03-31 22:25:53,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:25:53,848 INFO L225 Difference]: With dead ends: 1393 [2023-03-31 22:25:53,848 INFO L226 Difference]: Without dead ends: 921 [2023-03-31 22:25:53,853 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 22:25:53,855 INFO L413 NwaCegarLoop]: 346 mSDtfsCounter, 472 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 1402 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 472 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1775 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 373 IncrementalHoareTripleChecker+Valid, 1402 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-03-31 22:25:53,856 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [472 Valid, 366 Invalid, 1775 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 1402 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-03-31 22:25:53,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 921 states. [2023-03-31 22:25:53,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 921 to 919. [2023-03-31 22:25:53,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 919 states, 905 states have (on average 1.6209944751381216) internal successors, (1467), 905 states have internal predecessors, (1467), 7 states have call successors, (7), 7 states have call predecessors, (7), 6 states have return successors, (10), 6 states have call predecessors, (10), 6 states have call successors, (10) [2023-03-31 22:25:53,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 1484 transitions. [2023-03-31 22:25:53,930 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 1484 transitions. Word has length 11 [2023-03-31 22:25:53,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:25:53,931 INFO L495 AbstractCegarLoop]: Abstraction has 919 states and 1484 transitions. [2023-03-31 22:25:53,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 22:25:53,931 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 1484 transitions. [2023-03-31 22:25:53,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-03-31 22:25:53,932 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:25:53,933 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:25:53,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-03-31 22:25:53,933 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:25:53,934 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:25:53,934 INFO L85 PathProgramCache]: Analyzing trace with hash 31042294, now seen corresponding path program 1 times [2023-03-31 22:25:53,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:25:53,934 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281803267] [2023-03-31 22:25:53,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:25:53,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:25:53,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:25:54,100 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:25:54,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:25:54,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281803267] [2023-03-31 22:25:54,101 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281803267] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:25:54,101 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-03-31 22:25:54,101 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-03-31 22:25:54,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170853130] [2023-03-31 22:25:54,101 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:25:54,102 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:25:54,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:25:54,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:25:54,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-03-31 22:25:54,103 INFO L87 Difference]: Start difference. First operand 919 states and 1484 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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 22:25:56,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:25:56,786 INFO L93 Difference]: Finished difference Result 2795 states and 4544 transitions. [2023-03-31 22:25:56,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-03-31 22:25:56,786 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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 22 [2023-03-31 22:25:56,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:25:56,792 INFO L225 Difference]: With dead ends: 2795 [2023-03-31 22:25:56,792 INFO L226 Difference]: Without dead ends: 1881 [2023-03-31 22:25:56,794 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 22:25:56,794 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 1521 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 3160 mSolverCounterSat, 538 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1521 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 3698 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 538 IncrementalHoareTripleChecker+Valid, 3160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2023-03-31 22:25:56,795 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1521 Valid, 93 Invalid, 3698 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [538 Valid, 3160 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2023-03-31 22:25:56,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1881 states. [2023-03-31 22:25:56,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1881 to 1843. [2023-03-31 22:25:56,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1843 states, 1809 states have (on average 1.4145936981757876) internal successors, (2559), 1816 states have internal predecessors, (2559), 11 states have call successors, (11), 11 states have call predecessors, (11), 22 states have return successors, (54), 15 states have call predecessors, (54), 10 states have call successors, (54) [2023-03-31 22:25:56,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1843 states to 1843 states and 2624 transitions. [2023-03-31 22:25:56,828 INFO L78 Accepts]: Start accepts. Automaton has 1843 states and 2624 transitions. Word has length 22 [2023-03-31 22:25:56,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:25:56,829 INFO L495 AbstractCegarLoop]: Abstraction has 1843 states and 2624 transitions. [2023-03-31 22:25:56,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 4 states have internal predecessors, (16), 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 22:25:56,829 INFO L276 IsEmpty]: Start isEmpty. Operand 1843 states and 2624 transitions. [2023-03-31 22:25:56,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-03-31 22:25:56,830 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:25:56,830 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-03-31 22:25:56,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-03-31 22:25:56,830 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:25:56,831 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:25:56,831 INFO L85 PathProgramCache]: Analyzing trace with hash -764979672, now seen corresponding path program 1 times [2023-03-31 22:25:56,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:25:56,831 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137424473] [2023-03-31 22:25:56,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:25:56,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:25:56,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:25:56,936 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-03-31 22:25:56,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:25:56,936 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137424473] [2023-03-31 22:25:56,937 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137424473] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:25:56,937 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568097169] [2023-03-31 22:25:56,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:25:56,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:25:56,937 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:25:56,939 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 22:25:56,942 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 22:25:57,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:25:57,020 INFO L262 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 6 conjunts are in the unsatisfiable core [2023-03-31 22:25:57,024 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:25:57,068 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-03-31 22:25:57,068 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-03-31 22:25:57,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568097169] provided 1 perfect and 0 imperfect interpolant sequences [2023-03-31 22:25:57,069 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-03-31 22:25:57,069 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2023-03-31 22:25:57,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873167405] [2023-03-31 22:25:57,069 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-03-31 22:25:57,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-03-31 22:25:57,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-03-31 22:25:57,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-03-31 22:25:57,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-03-31 22:25:57,070 INFO L87 Difference]: Start difference. First operand 1843 states and 2624 transitions. Second operand has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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 22:25:59,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-03-31 22:25:59,346 INFO L93 Difference]: Finished difference Result 5615 states and 8140 transitions. [2023-03-31 22:25:59,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-03-31 22:25:59,363 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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 32 [2023-03-31 22:25:59,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-03-31 22:25:59,377 INFO L225 Difference]: With dead ends: 5615 [2023-03-31 22:25:59,377 INFO L226 Difference]: Without dead ends: 3777 [2023-03-31 22:25:59,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2023-03-31 22:25:59,382 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1572 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 2436 mSolverCounterSat, 1024 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1572 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 3460 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1024 IncrementalHoareTripleChecker+Valid, 2436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-03-31 22:25:59,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1572 Valid, 59 Invalid, 3460 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1024 Valid, 2436 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-03-31 22:25:59,387 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3777 states. [2023-03-31 22:25:59,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3777 to 3658. [2023-03-31 22:25:59,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3658 states, 3573 states have (on average 1.2549678141617688) internal successors, (4484), 3601 states have internal predecessors, (4484), 19 states have call successors, (19), 19 states have call predecessors, (19), 65 states have return successors, (195), 37 states have call predecessors, (195), 18 states have call successors, (195) [2023-03-31 22:25:59,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3658 states to 3658 states and 4698 transitions. [2023-03-31 22:25:59,472 INFO L78 Accepts]: Start accepts. Automaton has 3658 states and 4698 transitions. Word has length 32 [2023-03-31 22:25:59,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-03-31 22:25:59,472 INFO L495 AbstractCegarLoop]: Abstraction has 3658 states and 4698 transitions. [2023-03-31 22:25:59,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.0) internal successors, (20), 4 states have internal predecessors, (20), 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 22:25:59,472 INFO L276 IsEmpty]: Start isEmpty. Operand 3658 states and 4698 transitions. [2023-03-31 22:25:59,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2023-03-31 22:25:59,479 INFO L187 NwaCegarLoop]: Found error trace [2023-03-31 22:25:59,479 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 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] [2023-03-31 22:25:59,502 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-03-31 22:25:59,686 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:25:59,687 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-03-31 22:25:59,687 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-03-31 22:25:59,688 INFO L85 PathProgramCache]: Analyzing trace with hash -1601866412, now seen corresponding path program 1 times [2023-03-31 22:25:59,688 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-03-31 22:25:59,688 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70848942] [2023-03-31 22:25:59,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:25:59,688 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-03-31 22:25:59,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:25:59,884 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:25:59,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-03-31 22:25:59,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70848942] [2023-03-31 22:25:59,885 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70848942] provided 0 perfect and 1 imperfect interpolant sequences [2023-03-31 22:25:59,885 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1844586703] [2023-03-31 22:25:59,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-03-31 22:25:59,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-03-31 22:25:59,885 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-03-31 22:25:59,897 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 22:25:59,898 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 22:25:59,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-03-31 22:25:59,996 INFO L262 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 4 conjunts are in the unsatisfiable core [2023-03-31 22:25:59,999 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-03-31 22:26:00,045 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:26:00,045 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-03-31 22:26:00,125 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-03-31 22:26:00,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1844586703] provided 0 perfect and 2 imperfect interpolant sequences [2023-03-31 22:26:00,127 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [810057869] [2023-03-31 22:26:00,146 INFO L159 IcfgInterpreter]: Started Sifa with 70 locations of interest [2023-03-31 22:26:00,148 INFO L166 IcfgInterpreter]: Building call graph [2023-03-31 22:26:00,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-03-31 22:26:00,156 INFO L176 IcfgInterpreter]: Starting interpretation [2023-03-31 22:26:00,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-03-31 22:26:00,255 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 44 for LOIs [2023-03-31 22:26:00,364 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 40 [2023-03-31 22:26:00,524 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 5700 conjuctions. This might take some time... [2023-03-31 22:26:00,606 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 53 conjuctions. [2023-03-31 22:26:00,638 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 21 [2023-03-31 22:26:01,200 INFO L197 IcfgInterpreter]: Interpreting procedure calculate_output with input of size 45 for LOIs [2023-03-31 22:26:01,334 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 40 [2023-03-31 22:26:01,964 WARN L137 XnfTransformerHelper]: expecting exponential blowup for input size 21 [2023-03-31 22:26:02,247 WARN L176 XnfTransformerHelper]: Simplifying disjunction of 25455 conjuctions. This might take some time... [2023-03-31 22:26:04,251 INFO L192 XnfTransformerHelper]: Simplified to disjunction of 870 conjuctions.