/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/array-examples/standard_two_index_01.i -------------------------------------------------------------------------------- This is Ultimate 0.2.3-dev-f954360 [2023-04-02 14:15:35,855 INFO L177 SettingsManager]: Resetting all preferences to default values... [2023-04-02 14:15:35,856 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2023-04-02 14:15:35,887 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2023-04-02 14:15:35,888 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2023-04-02 14:15:35,890 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2023-04-02 14:15:35,893 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2023-04-02 14:15:35,894 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2023-04-02 14:15:35,895 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2023-04-02 14:15:35,896 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2023-04-02 14:15:35,897 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2023-04-02 14:15:35,898 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2023-04-02 14:15:35,898 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2023-04-02 14:15:35,899 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2023-04-02 14:15:35,899 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2023-04-02 14:15:35,900 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2023-04-02 14:15:35,901 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2023-04-02 14:15:35,902 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2023-04-02 14:15:35,903 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2023-04-02 14:15:35,904 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2023-04-02 14:15:35,913 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2023-04-02 14:15:35,919 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2023-04-02 14:15:35,919 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2023-04-02 14:15:35,920 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2023-04-02 14:15:35,923 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2023-04-02 14:15:35,925 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2023-04-02 14:15:35,925 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2023-04-02 14:15:35,926 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2023-04-02 14:15:35,926 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2023-04-02 14:15:35,927 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2023-04-02 14:15:35,927 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2023-04-02 14:15:35,928 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2023-04-02 14:15:35,928 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2023-04-02 14:15:35,928 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2023-04-02 14:15:35,929 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2023-04-02 14:15:35,929 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2023-04-02 14:15:35,936 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 14:15:35,970 INFO L113 SettingsManager]: Loading preferences was successful [2023-04-02 14:15:35,970 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2023-04-02 14:15:35,971 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-04-02 14:15:35,971 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-04-02 14:15:35,972 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-04-02 14:15:35,972 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-04-02 14:15:35,972 INFO L138 SettingsManager]: * User list type=DISABLED [2023-04-02 14:15:35,972 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-04-02 14:15:35,972 INFO L138 SettingsManager]: * Explicit value domain=true [2023-04-02 14:15:35,972 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-04-02 14:15:35,973 INFO L138 SettingsManager]: * Octagon Domain=false [2023-04-02 14:15:35,973 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2023-04-02 14:15:35,973 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-04-02 14:15:35,974 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-04-02 14:15:35,974 INFO L138 SettingsManager]: * Interval Domain=false [2023-04-02 14:15:35,974 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-04-02 14:15:35,974 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-04-02 14:15:35,974 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2023-04-02 14:15:35,975 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * sizeof long=4 [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * sizeof POINTER=4 [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-04-02 14:15:35,975 INFO L138 SettingsManager]: * sizeof long double=12 [2023-04-02 14:15:35,976 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2023-04-02 14:15:35,976 INFO L138 SettingsManager]: * Use constant arrays=true [2023-04-02 14:15:35,976 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-04-02 14:15:35,976 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-04-02 14:15:35,976 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2023-04-02 14:15:35,976 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:15:35,977 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-04-02 14:15:35,977 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-04-02 14:15:35,978 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> OctagonDomain [2023-04-02 14:15:36,209 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-04-02 14:15:36,230 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-04-02 14:15:36,232 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-04-02 14:15:36,233 INFO L271 PluginConnector]: Initializing CDTParser... [2023-04-02 14:15:36,234 INFO L275 PluginConnector]: CDTParser initialized [2023-04-02 14:15:36,235 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_two_index_01.i [2023-04-02 14:15:37,357 INFO L500 CDTParser]: Created temporary CDT project at NULL [2023-04-02 14:15:37,546 INFO L351 CDTParser]: Found 1 translation units. [2023-04-02 14:15:37,546 INFO L172 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i [2023-04-02 14:15:37,551 INFO L394 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b2a08366/701139d4688f4d48bb0285aaa66072f4/FLAGbbfbe8ef5 [2023-04-02 14:15:37,561 INFO L402 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0b2a08366/701139d4688f4d48bb0285aaa66072f4 [2023-04-02 14:15:37,564 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-04-02 14:15:37,565 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2023-04-02 14:15:37,566 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-04-02 14:15:37,566 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-04-02 14:15:37,570 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2023-04-02 14:15:37,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,572 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15b9c98a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37, skipping insertion in model container [2023-04-02 14:15:37,572 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,577 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2023-04-02 14:15:37,588 INFO L178 MainTranslator]: Built tables and reachable declarations [2023-04-02 14:15:37,706 WARN L247 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/array-examples/standard_two_index_01.i[814,827] [2023-04-02 14:15:37,721 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:15:37,730 INFO L203 MainTranslator]: Completed pre-run [2023-04-02 14:15:37,740 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/array-examples/standard_two_index_01.i[814,827] [2023-04-02 14:15:37,750 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-04-02 14:15:37,765 INFO L208 MainTranslator]: Completed translation [2023-04-02 14:15:37,765 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37 WrapperNode [2023-04-02 14:15:37,766 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-04-02 14:15:37,767 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-04-02 14:15:37,767 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2023-04-02 14:15:37,767 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2023-04-02 14:15:37,777 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,777 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,783 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,784 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,797 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,802 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,804 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,805 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,806 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-04-02 14:15:37,807 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-04-02 14:15:37,808 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2023-04-02 14:15:37,808 INFO L275 PluginConnector]: RCFGBuilder initialized [2023-04-02 14:15:37,809 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (1/1) ... [2023-04-02 14:15:37,816 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-04-02 14:15:37,825 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:15:37,842 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 14:15:37,865 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 14:15:37,880 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2023-04-02 14:15:37,881 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-04-02 14:15:37,881 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2023-04-02 14:15:37,881 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-04-02 14:15:37,881 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2023-04-02 14:15:37,881 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2023-04-02 14:15:37,881 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2023-04-02 14:15:37,881 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2023-04-02 14:15:37,881 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure main [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-04-02 14:15:37,882 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-04-02 14:15:37,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2023-04-02 14:15:37,883 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-04-02 14:15:37,883 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-04-02 14:15:37,965 INFO L236 CfgBuilder]: Building ICFG [2023-04-02 14:15:37,967 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-04-02 14:15:38,148 INFO L277 CfgBuilder]: Performing block encoding [2023-04-02 14:15:38,188 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-04-02 14:15:38,188 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-04-02 14:15:38,191 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:15:38 BoogieIcfgContainer [2023-04-02 14:15:38,192 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-04-02 14:15:38,193 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-04-02 14:15:38,194 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2023-04-02 14:15:38,196 INFO L275 PluginConnector]: TraceAbstraction initialized [2023-04-02 14:15:38,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.04 02:15:37" (1/3) ... [2023-04-02 14:15:38,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d9937 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:15:38, skipping insertion in model container [2023-04-02 14:15:38,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.04 02:15:37" (2/3) ... [2023-04-02 14:15:38,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50d9937 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.04 02:15:38, skipping insertion in model container [2023-04-02 14:15:38,198 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.04 02:15:38" (3/3) ... [2023-04-02 14:15:38,199 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_two_index_01.i [2023-04-02 14:15:38,214 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-04-02 14:15:38,214 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-04-02 14:15:38,267 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-04-02 14:15:38,274 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;@5efc2ed, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-04-02 14:15:38,275 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-04-02 14:15:38,279 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 14:15:38,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-04-02 14:15:38,287 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:38,287 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:38,288 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:38,294 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:38,294 INFO L85 PathProgramCache]: Analyzing trace with hash -1320884995, now seen corresponding path program 1 times [2023-04-02 14:15:38,303 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:38,303 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1230868008] [2023-04-02 14:15:38,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:38,304 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:38,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:38,563 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 14:15:38,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:15:38,564 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1230868008] [2023-04-02 14:15:38,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1230868008] provided 1 perfect and 0 imperfect interpolant sequences [2023-04-02 14:15:38,565 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-04-02 14:15:38,565 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-04-02 14:15:38,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781955912] [2023-04-02 14:15:38,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-04-02 14:15:38,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-04-02 14:15:38,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:15:38,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-04-02 14:15:38,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-04-02 14:15:38,612 INFO L87 Difference]: Start difference. First operand has 19 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 14:15:38,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:15:38,678 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2023-04-02 14:15:38,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-04-02 14:15:38,680 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 12 [2023-04-02 14:15:38,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:15:38,686 INFO L225 Difference]: With dead ends: 37 [2023-04-02 14:15:38,687 INFO L226 Difference]: Without dead ends: 21 [2023-04-02 14:15:38,690 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 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 14:15:38,694 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:15:38,695 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 25 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:15:38,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-04-02 14:15:38,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2023-04-02 14:15:38,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:15:38,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2023-04-02 14:15:38,721 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2023-04-02 14:15:38,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:15:38,722 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2023-04-02 14:15:38,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 14:15:38,722 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2023-04-02 14:15:38,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-04-02 14:15:38,723 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:38,723 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:38,723 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-04-02 14:15:38,723 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:38,724 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:38,724 INFO L85 PathProgramCache]: Analyzing trace with hash 236958900, now seen corresponding path program 1 times [2023-04-02 14:15:38,724 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:38,724 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989064834] [2023-04-02 14:15:38,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:38,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:38,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:38,808 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 14:15:38,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:15:38,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989064834] [2023-04-02 14:15:38,809 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989064834] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:15:38,809 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1707873763] [2023-04-02 14:15:38,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:38,810 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:38,810 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:15:38,812 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 14:15:38,818 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 14:15:38,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:38,873 INFO L262 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 3 conjunts are in the unsatisfiable core [2023-04-02 14:15:38,877 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:15:38,911 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 14:15:38,911 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:15:38,934 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-04-02 14:15:38,935 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1707873763] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:15:38,935 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610304808] [2023-04-02 14:15:38,982 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:15:38,982 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:15:38,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:15:38,989 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:15:38,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:15:39,071 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:15:39,439 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:15:39,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:15:39,501 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:15:39,991 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '196#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#b~0.base_BEFORE_CALL_1| Int) (|v_main_~#a~0.base_BEFORE_CALL_1| Int)) (and (<= 2 |v_main_~#a~0.base_BEFORE_CALL_1|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_1|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_1| |#StackHeapBarrier|)) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_1| |v_main_~#a~0.base_BEFORE_CALL_1|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_1|)) (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_1|) 0) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_1|) 0))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_1|) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_1|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:15:39,991 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:15:39,991 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:15:39,991 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-04-02 14:15:39,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189243057] [2023-04-02 14:15:39,992 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:15:39,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-04-02 14:15:39,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:15:39,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-04-02 14:15:39,996 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:15:39,996 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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 14:15:40,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:15:40,063 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2023-04-02 14:15:40,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-04-02 14:15:40,063 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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 14 [2023-04-02 14:15:40,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:15:40,065 INFO L225 Difference]: With dead ends: 45 [2023-04-02 14:15:40,065 INFO L226 Difference]: Without dead ends: 34 [2023-04-02 14:15:40,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2023-04-02 14:15:40,068 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 5 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-04-02 14:15:40,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 38 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-04-02 14:15:40,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-04-02 14:15:40,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 24. [2023-04-02 14:15:40,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:15:40,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2023-04-02 14:15:40,079 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 14 [2023-04-02 14:15:40,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:15:40,079 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2023-04-02 14:15:40,079 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 states have internal predecessors, (15), 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 14:15:40,080 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2023-04-02 14:15:40,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-04-02 14:15:40,080 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:40,080 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:40,088 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-04-02 14:15:40,286 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:40,286 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:40,287 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:40,287 INFO L85 PathProgramCache]: Analyzing trace with hash -273509699, now seen corresponding path program 2 times [2023-04-02 14:15:40,287 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:40,287 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293985794] [2023-04-02 14:15:40,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:40,288 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:40,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:40,531 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:15:40,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:15:40,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293985794] [2023-04-02 14:15:40,533 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1293985794] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:15:40,533 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759173205] [2023-04-02 14:15:40,533 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:15:40,534 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:40,534 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:15:40,535 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 14:15:40,538 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 14:15:40,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-04-02 14:15:40,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:15:40,625 INFO L262 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 6 conjunts are in the unsatisfiable core [2023-04-02 14:15:40,627 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:15:40,650 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:15:40,650 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:15:40,708 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-04-02 14:15:40,709 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759173205] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:15:40,709 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [88195275] [2023-04-02 14:15:40,715 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:15:40,716 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:15:40,717 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:15:40,717 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:15:40,717 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:15:40,752 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:15:40,906 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:15:40,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:15:40,933 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:15:41,315 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '452#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_2| Int) (|v_main_~#b~0.base_BEFORE_CALL_2| Int)) (and (not (= (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_2|) 0) (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_2|) 0))) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_2| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_2|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_2|) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_2|) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_2| |v_main_~#a~0.base_BEFORE_CALL_2|)) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_2|)) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_2|))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:15:41,315 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:15:41,315 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:15:41,315 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2023-04-02 14:15:41,315 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750415590] [2023-04-02 14:15:41,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:15:41,316 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-04-02 14:15:41,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:15:41,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-04-02 14:15:41,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=413, Unknown=0, NotChecked=0, Total=552 [2023-04-02 14:15:41,317 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 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 14:15:41,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:15:41,414 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2023-04-02 14:15:41,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-04-02 14:15:41,415 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 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 20 [2023-04-02 14:15:41,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:15:41,416 INFO L225 Difference]: With dead ends: 78 [2023-04-02 14:15:41,416 INFO L226 Difference]: Without dead ends: 64 [2023-04-02 14:15:41,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=139, Invalid=413, Unknown=0, NotChecked=0, Total=552 [2023-04-02 14:15:41,417 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 21 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-04-02 14:15:41,418 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 38 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-04-02 14:15:41,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-04-02 14:15:41,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 36. [2023-04-02 14:15:41,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:15:41,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2023-04-02 14:15:41,425 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 20 [2023-04-02 14:15:41,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:15:41,426 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2023-04-02 14:15:41,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 13 states have internal predecessors, (21), 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 14:15:41,426 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2023-04-02 14:15:41,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-04-02 14:15:41,426 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:41,427 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:41,435 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-04-02 14:15:41,633 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2023-04-02 14:15:41,633 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:41,633 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:41,634 INFO L85 PathProgramCache]: Analyzing trace with hash 1389982557, now seen corresponding path program 3 times [2023-04-02 14:15:41,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:41,634 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288501716] [2023-04-02 14:15:41,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:41,634 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:41,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:41,865 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-02 14:15:41,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:15:41,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288501716] [2023-04-02 14:15:41,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288501716] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:15:41,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782482651] [2023-04-02 14:15:41,866 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-04-02 14:15:41,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:41,866 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:15:41,868 INFO L229 MonitoredProcess]: Starting monitored process 4 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:15:41,870 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-04-02 14:15:41,958 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-04-02 14:15:41,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-04-02 14:15:41,960 INFO L262 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 12 conjunts are in the unsatisfiable core [2023-04-02 14:15:41,962 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:15:41,982 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-02 14:15:41,982 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:15:42,177 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2023-04-02 14:15:42,177 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782482651] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:15:42,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641420891] [2023-04-02 14:15:42,179 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:15:42,179 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:15:42,180 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:15:42,180 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:15:42,180 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:15:42,206 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:15:42,289 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:15:42,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:15:42,306 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:15:42,707 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '876#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_main_~#a~0.base_BEFORE_CALL_3| Int) (|v_main_~#b~0.base_BEFORE_CALL_3| Int)) (and (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_3|) 0) (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_3|) 0))) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_3|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_3|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_3| |#StackHeapBarrier|)) (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_3|) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_3| |v_main_~#a~0.base_BEFORE_CALL_3|)) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_3|) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_3|)))) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:15:42,707 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:15:42,707 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:15:42,707 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-04-02 14:15:42,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [698584072] [2023-04-02 14:15:42,708 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:15:42,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-04-02 14:15:42,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:15:42,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-04-02 14:15:42,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=385, Invalid=875, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 14:15:42,710 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 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 14:15:42,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:15:42,965 INFO L93 Difference]: Finished difference Result 144 states and 192 transitions. [2023-04-02 14:15:42,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-04-02 14:15:42,966 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 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 32 [2023-04-02 14:15:42,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:15:42,970 INFO L225 Difference]: With dead ends: 144 [2023-04-02 14:15:42,970 INFO L226 Difference]: Without dead ends: 124 [2023-04-02 14:15:42,971 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 436 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=385, Invalid=875, Unknown=0, NotChecked=0, Total=1260 [2023-04-02 14:15:42,973 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 62 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 297 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-04-02 14:15:42,974 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 47 Invalid, 297 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-04-02 14:15:42,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2023-04-02 14:15:42,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 60. [2023-04-02 14:15:42,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:15:42,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2023-04-02 14:15:42,992 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 32 [2023-04-02 14:15:42,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:15:42,992 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2023-04-02 14:15:42,995 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.32) internal successors, (33), 25 states have internal predecessors, (33), 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 14:15:42,995 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2023-04-02 14:15:42,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-04-02 14:15:42,998 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:42,998 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:43,007 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-04-02 14:15:43,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:43,208 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:43,208 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:43,208 INFO L85 PathProgramCache]: Analyzing trace with hash 1939033245, now seen corresponding path program 4 times [2023-04-02 14:15:43,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:43,208 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [773923881] [2023-04-02 14:15:43,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:43,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:43,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:43,891 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 14:15:43,891 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:15:43,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [773923881] [2023-04-02 14:15:43,892 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [773923881] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:15:43,892 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234293901] [2023-04-02 14:15:43,892 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-04-02 14:15:43,892 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:43,892 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:15:43,893 INFO L229 MonitoredProcess]: Starting monitored process 5 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:15:43,903 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-04-02 14:15:44,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:44,043 INFO L262 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 24 conjunts are in the unsatisfiable core [2023-04-02 14:15:44,047 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-04-02 14:15:44,088 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 14:15:44,088 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-04-02 14:15:44,745 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2023-04-02 14:15:44,746 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234293901] provided 0 perfect and 2 imperfect interpolant sequences [2023-04-02 14:15:44,746 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [953008082] [2023-04-02 14:15:44,748 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-04-02 14:15:44,748 INFO L166 IcfgInterpreter]: Building call graph [2023-04-02 14:15:44,748 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-04-02 14:15:44,749 INFO L176 IcfgInterpreter]: Starting interpretation [2023-04-02 14:15:44,749 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-04-02 14:15:44,764 INFO L197 IcfgInterpreter]: Interpreting procedure main with input of size 18 for LOIs [2023-04-02 14:15:44,864 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 40 for LOIs [2023-04-02 14:15:44,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 7 for LOIs [2023-04-02 14:15:44,881 INFO L180 IcfgInterpreter]: Interpretation finished [2023-04-02 14:15:45,318 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1636#(and (exists ((|v_main_~#a~0.base_BEFORE_CALL_4| Int) (|v_main_~#b~0.base_BEFORE_CALL_4| Int)) (and (<= (+ |#StackHeapBarrier| 1) |v_main_~#b~0.base_BEFORE_CALL_4|) (<= (+ |#StackHeapBarrier| 1) |v_main_~#a~0.base_BEFORE_CALL_4|) (<= 2 |v_main_~#a~0.base_BEFORE_CALL_4|) (<= 3 (+ |v_main_~#b~0.base_BEFORE_CALL_4| |#StackHeapBarrier|)) (<= 4 (+ |v_main_~#b~0.base_BEFORE_CALL_4| |v_main_~#a~0.base_BEFORE_CALL_4|)) (<= 2 |v_main_~#b~0.base_BEFORE_CALL_4|) (not (= (select (select |#memory_int| |v_main_~#a~0.base_BEFORE_CALL_4|) 0) (select (select |#memory_int| |v_main_~#b~0.base_BEFORE_CALL_4|) 0))) (<= 3 (+ |#StackHeapBarrier| |v_main_~#a~0.base_BEFORE_CALL_4|)))) (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (= |#NULL.base| 0))' at error location [2023-04-02 14:15:45,318 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-04-02 14:15:45,318 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-04-02 14:15:45,318 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 49 [2023-04-02 14:15:45,318 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853110797] [2023-04-02 14:15:45,319 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-04-02 14:15:45,319 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-04-02 14:15:45,319 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-04-02 14:15:45,320 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-04-02 14:15:45,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1309, Invalid=2231, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 14:15:45,322 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 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 14:15:45,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-04-02 14:15:45,904 INFO L93 Difference]: Finished difference Result 276 states and 372 transitions. [2023-04-02 14:15:45,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-04-02 14:15:45,905 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 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 56 [2023-04-02 14:15:45,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-04-02 14:15:45,907 INFO L225 Difference]: With dead ends: 276 [2023-04-02 14:15:45,908 INFO L226 Difference]: Without dead ends: 244 [2023-04-02 14:15:45,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 904 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1309, Invalid=2231, Unknown=0, NotChecked=0, Total=3540 [2023-04-02 14:15:45,910 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 139 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 240 mSolverCounterSat, 397 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 185 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 240 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-04-02 14:15:45,911 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [185 Valid, 56 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 240 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-04-02 14:15:45,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2023-04-02 14:15:45,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 108. [2023-04-02 14:15:45,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 102 states have (on average 1.0294117647058822) internal successors, (105), 102 states have internal predecessors, (105), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-04-02 14:15:45,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2023-04-02 14:15:45,945 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 56 [2023-04-02 14:15:45,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-04-02 14:15:45,945 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2023-04-02 14:15:45,945 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.163265306122449) internal successors, (57), 49 states have internal predecessors, (57), 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 14:15:45,945 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2023-04-02 14:15:45,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2023-04-02 14:15:45,947 INFO L187 NwaCegarLoop]: Found error trace [2023-04-02 14:15:45,947 INFO L195 NwaCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-04-02 14:15:45,954 INFO L540 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-04-02 14:15:46,154 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:46,154 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-04-02 14:15:46,154 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-04-02 14:15:46,154 INFO L85 PathProgramCache]: Analyzing trace with hash -401645795, now seen corresponding path program 5 times [2023-04-02 14:15:46,155 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-04-02 14:15:46,155 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1781766801] [2023-04-02 14:15:46,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-04-02 14:15:46,155 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-04-02 14:15:46,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-04-02 14:15:48,185 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2023-04-02 14:15:48,185 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-04-02 14:15:48,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1781766801] [2023-04-02 14:15:48,185 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1781766801] provided 0 perfect and 1 imperfect interpolant sequences [2023-04-02 14:15:48,185 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342785570] [2023-04-02 14:15:48,185 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-04-02 14:15:48,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-04-02 14:15:48,186 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-04-02 14:15:48,189 INFO L229 MonitoredProcess]: Starting monitored process 6 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-04-02 14:15:48,197 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process